/*******************************************************************************
 * Copyright (c) 2000, 2021 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.widgets;


import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.ole.win32.*;
import org.eclipse.swt.internal.win32.*;
import org.eclipse.swt.internal.win32.version.*;

/**
 * Instances of this class represent the "windows"
 * which the desktop or "window manager" is managing.
 * Instances that do not have a parent (that is, they
 * are built using the constructor, which takes a
 * <code>Display</code> as the argument) are described
 * as <em>top level</em> shells. Instances that do have
 * a parent are described as <em>secondary</em> or
 * <em>dialog</em> shells.
 * <p>
 * Instances are always displayed in one of the maximized,
 * minimized or normal states:</p>
 * <ul>
 * <li>
 * When an instance is marked as <em>maximized</em>, the
 * window manager will typically resize it to fill the
 * entire visible area of the display, and the instance
 * is usually put in a state where it can not be resized
 * (even if it has style <code>RESIZE</code>) until it is
 * no longer maximized.
 * </li><li>
 * When an instance is in the <em>normal</em> state (neither
 * maximized or minimized), its appearance is controlled by
 * the style constants which were specified when it was created
 * and the restrictions of the window manager (see below).
 * </li><li>
 * When an instance has been marked as <em>minimized</em>,
 * its contents (client area) will usually not be visible,
 * and depending on the window manager, it may be
 * "iconified" (that is, replaced on the desktop by a small
 * simplified representation of itself), relocated to a
 * distinguished area of the screen, or hidden. Combinations
 * of these changes are also possible.
 * </li>
 * </ul>
 * <p>
 * The <em>modality</em> of an instance may be specified using
 * style bits. The modality style bits are used to determine
 * whether input is blocked for other shells on the display.
 * The <code>PRIMARY_MODAL</code> style allows an instance to block
 * input to its parent. The <code>APPLICATION_MODAL</code> style
 * allows an instance to block input to every other shell in the
 * display. The <code>SYSTEM_MODAL</code> style allows an instance
 * to block input to all shells, including shells belonging to
 * different applications.
 * </p><p>
 * Note: The styles supported by this class are treated
 * as <em>HINT</em>s, since the window manager for the
 * desktop on which the instance is visible has ultimate
 * control over the appearance and behavior of decorations
 * and modality. For example, some window managers only
 * support resizable windows and will always assume the
 * RESIZE style, even if it is not set. In addition, if a
 * modality style is not supported, it is "upgraded" to a
 * more restrictive modality style that is supported. For
 * example, if <code>PRIMARY_MODAL</code> is not supported,
 * it would be upgraded to <code>APPLICATION_MODAL</code>.
 * A modality style may also be "downgraded" to a less
 * restrictive style. For example, most operating systems
 * no longer support <code>SYSTEM_MODAL</code> because
 * it can freeze up the desktop, so this is typically
 * downgraded to <code>APPLICATION_MODAL</code>.</p>
 * <dl>
 * <dt><b>Styles:</b></dt>
 * <dd>BORDER, CLOSE, MIN, MAX, NO_MOVE, NO_TRIM, RESIZE, TITLE, ON_TOP, TOOL, SHEET</dd>
 * <dd>APPLICATION_MODAL, MODELESS, PRIMARY_MODAL, SYSTEM_MODAL</dd>
 * <dt><b>Events:</b></dt>
 * <dd>Activate, Close, Deactivate, Deiconify, Iconify</dd>
 * </dl>
 * <p>
 * Class <code>SWT</code> provides two "convenience constants"
 * for the most commonly required style combinations:</p>
 * <dl>
 * <dt><code>SHELL_TRIM</code></dt>
 * <dd>
 * the result of combining the constants which are required
 * to produce a typical application top level shell: (that
 * is, <code>CLOSE | TITLE | MIN | MAX | RESIZE</code>)
 * </dd>
 * <dt><code>DIALOG_TRIM</code></dt>
 * <dd>
 * the result of combining the constants which are required
 * to produce a typical application dialog shell: (that
 * is, <code>TITLE | CLOSE | BORDER</code>)
 * </dd>
 * </dl>
 * <p>
 * Note: Only one of the styles APPLICATION_MODAL, MODELESS,
 * PRIMARY_MODAL and SYSTEM_MODAL may be specified.
 * </p><p>
 * IMPORTANT: This class is <em>not</em> intended to be subclassed.
 * </p>
 *
 * @see Decorations
 * @see SWT
 * @see <a href="https://eclipse.dev/eclipse/swt/snippets/#shell">Shell snippets</a>
 * @see <a href="https://eclipse.dev/eclipse/swt/examples.html">SWT Example: ControlExample</a>
 * @see <a href="https://eclipse.dev/eclipse/swt/">Sample code and further information</a>
 * @noextend This class is not intended to be subclassed by clients.
 */
public class Shell extends Decorations {
	Menu activeMenu;
	ToolTip [] toolTips;
	long hwndMDIClient, lpstrTip, toolTipHandle, balloonTipHandle, menuItemToolTipHandle;
	int minWidth = SWT.DEFAULT, minHeight = SWT.DEFAULT, maxWidth = SWT.DEFAULT, maxHeight = SWT.DEFAULT;
	long [] brushes;
	boolean showWithParent, fullScreen, wasMaximized, modified, center;
	String toolTitle, balloonTitle;
	long toolIcon, balloonIcon;
	long windowProc;
	Control lastActive;
	static /*final*/ long ToolTipProc;
	static final long DialogProc;
	static final TCHAR DialogClass = new TCHAR (0, "#32770", true);
	final static int [] SYSTEM_COLORS = {
		OS.COLOR_BTNFACE,
		OS.COLOR_WINDOW,
		OS.COLOR_BTNTEXT,
		OS.COLOR_WINDOWTEXT,
		OS.COLOR_HIGHLIGHT,
		OS.COLOR_SCROLLBAR,
	};
	final static int BRUSHES_SIZE = 32;
	static {
		WNDCLASS lpWndClass = new WNDCLASS ();
		OS.GetClassInfo (0, DialogClass, lpWndClass);
		DialogProc = lpWndClass.lpfnWndProc;
	}

	/** Cache for currently processed DPI change event to be able to cancel it if a new one is triggered */
	Event lastDpiChangeEvent;


/**
 * Constructs a new instance of this class. This is equivalent
 * to calling <code>Shell((Display) null)</code>.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 */
public Shell () {
	this ((Display) null);
}

/**
 * Constructs a new instance of this class given only the style
 * value describing its behavior and appearance. This is equivalent
 * to calling <code>Shell((Display) null, style)</code>.
 * <p>
 * The style value is either one of the style constants defined in
 * class <code>SWT</code> which is applicable to instances of this
 * class, or must be built by <em>bitwise OR</em>'ing together
 * (that is, using the <code>int</code> "|" operator) two or more
 * of those <code>SWT</code> style constants. The class description
 * lists the style constants that are applicable to the class.
 * Style bits are also inherited from superclasses.
 * </p>
 *
 * @param style the style of control to construct
 *
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 *
 * @see SWT#BORDER
 * @see SWT#CLOSE
 * @see SWT#MIN
 * @see SWT#MAX
 * @see SWT#RESIZE
 * @see SWT#TITLE
 * @see SWT#TOOL
 * @see SWT#NO_TRIM
 * @see SWT#NO_MOVE
 * @see SWT#SHELL_TRIM
 * @see SWT#DIALOG_TRIM
 * @see SWT#ON_TOP
 * @see SWT#MODELESS
 * @see SWT#PRIMARY_MODAL
 * @see SWT#APPLICATION_MODAL
 * @see SWT#SYSTEM_MODAL
 * @see SWT#SHEET
 */
public Shell (int style) {
	this ((Display) null, style);
}

/**
 * Constructs a new instance of this class given only the display
 * to create it on. It is created with style <code>SWT.SHELL_TRIM</code>.
 * <p>
 * Note: Currently, null can be passed in for the display argument.
 * This has the effect of creating the shell on the currently active
 * display if there is one. If there is no current display, the
 * shell is created on a "default" display. <b>Passing in null as
 * the display argument is not considered to be good coding style,
 * and may not be supported in a future release of SWT.</b>
 * </p>
 *
 * @param display the display to create the shell on
 *
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 */
public Shell (Display display) {
	this (display, SWT.SHELL_TRIM);
}

/**
 * Constructs a new instance of this class given the display
 * to create it on and a style value describing its behavior
 * and appearance.
 * <p>
 * The style value is either one of the style constants defined in
 * class <code>SWT</code> which is applicable to instances of this
 * class, or must be built by <em>bitwise OR</em>'ing together
 * (that is, using the <code>int</code> "|" operator) two or more
 * of those <code>SWT</code> style constants. The class description
 * lists the style constants that are applicable to the class.
 * Style bits are also inherited from superclasses.
 * </p><p>
 * Note: Currently, null can be passed in for the display argument.
 * This has the effect of creating the shell on the currently active
 * display if there is one. If there is no current display, the
 * shell is created on a "default" display. <b>Passing in null as
 * the display argument is not considered to be good coding style,
 * and may not be supported in a future release of SWT.</b>
 * </p>
 *
 * @param display the display to create the shell on
 * @param style the style of control to construct
 *
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 *
 * @see SWT#BORDER
 * @see SWT#CLOSE
 * @see SWT#MIN
 * @see SWT#MAX
 * @see SWT#RESIZE
 * @see SWT#TITLE
 * @see SWT#TOOL
 * @see SWT#NO_TRIM
 * @see SWT#NO_MOVE
 * @see SWT#SHELL_TRIM
 * @see SWT#DIALOG_TRIM
 * @see SWT#ON_TOP
 * @see SWT#MODELESS
 * @see SWT#PRIMARY_MODAL
 * @see SWT#APPLICATION_MODAL
 * @see SWT#SYSTEM_MODAL
 * @see SWT#SHEET
 */
public Shell (Display display, int style) {
	this (display, null, style, 0, false);
}

Shell (Display display, Shell parent, int style, long handle, boolean embedded) {
	super ();
	checkSubclass ();
	if (display == null) display = Display.getCurrent ();
	if (display == null) display = Display.getDefault ();
	if (!display.isValidThread ()) {
		error (SWT.ERROR_THREAD_INVALID_ACCESS);
	}
	if (parent != null && parent.isDisposed ()) {
		error (SWT.ERROR_INVALID_ARGUMENT);
	}
	this.center = parent != null && (style & SWT.SHEET) != 0;
	this.style = checkStyle (parent, style);
	this.parent = parent;
	this.display = display;
	this.handle = handle;
	if (handle != 0 && !embedded) {
		state |= FOREIGN_HANDLE;
	}
	reskinWidget();
	createWidget ();
	this.nativeZoom = DPIUtil.mapDPIToZoom(OS.GetDpiForWindow(this.handle));
	registerDPIChangeListener();	/* Register the DPI change handler here since it does not call Widget constructor which registers the DPI change listener. */
}

/**
 * Constructs a new instance of this class given only its
 * parent. It is created with style <code>SWT.DIALOG_TRIM</code>.
 * <p>
 * Note: Currently, null can be passed in for the parent.
 * This has the effect of creating the shell on the currently active
 * display if there is one. If there is no current display, the
 * shell is created on a "default" display. <b>Passing in null as
 * the parent is not considered to be good coding style,
 * and may not be supported in a future release of SWT.</b>
 * </p>
 *
 * @param parent a shell which will be the parent of the new instance
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the parent is disposed</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 */
public Shell (Shell parent) {
	this (parent, SWT.DIALOG_TRIM);
}

/**
 * Constructs a new instance of this class given its parent
 * and a style value describing its behavior and appearance.
 * <p>
 * The style value is either one of the style constants defined in
 * class <code>SWT</code> which is applicable to instances of this
 * class, or must be built by <em>bitwise OR</em>'ing together
 * (that is, using the <code>int</code> "|" operator) two or more
 * of those <code>SWT</code> style constants. The class description
 * lists the style constants that are applicable to the class.
 * Style bits are also inherited from superclasses.
 * </p><p>
 * Note: Currently, null can be passed in for the parent.
 * This has the effect of creating the shell on the currently active
 * display if there is one. If there is no current display, the
 * shell is created on a "default" display. <b>Passing in null as
 * the parent is not considered to be good coding style,
 * and may not be supported in a future release of SWT.</b>
 * </p>
 *
 * @param parent a shell which will be the parent of the new instance
 * @param style the style of control to construct
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the parent is disposed</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 *
 * @see SWT#BORDER
 * @see SWT#CLOSE
 * @see SWT#MIN
 * @see SWT#MAX
 * @see SWT#RESIZE
 * @see SWT#TITLE
 * @see SWT#NO_TRIM
 * @see SWT#NO_MOVE
 * @see SWT#SHELL_TRIM
 * @see SWT#DIALOG_TRIM
 * @see SWT#ON_TOP
 * @see SWT#TOOL
 * @see SWT#MODELESS
 * @see SWT#PRIMARY_MODAL
 * @see SWT#APPLICATION_MODAL
 * @see SWT#SYSTEM_MODAL
 * @see SWT#SHEET
 */
public Shell (Shell parent, int style) {
	this (parent != null ? parent.display : null, parent, style, 0, false);
}

/**
 * Invokes platform specific functionality to allocate a new shell
 * that is embedded.
 * <p>
 * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
 * API for <code>Shell</code>. It is marked public only so that it
 * can be shared within the packages provided by SWT. It is not
 * available on all platforms, and should never be called from
 * application code.
 * </p>
 *
 * @param display the display for the shell
 * @param handle the handle for the shell
 * @return a new shell object containing the specified display and handle
 *
 * @noreference This method is not intended to be referenced by clients.
 */
public static Shell win32_new (Display display, long handle) {
	return new Shell (display, null, SWT.NO_TRIM, handle, true);
}

/**
 * Invokes platform specific functionality to allocate a new shell
 * that is not embedded.
 * <p>
 * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
 * API for <code>Shell</code>. It is marked public only so that it
 * can be shared within the packages provided by SWT. It is not
 * available on all platforms, and should never be called from
 * application code.
 * </p>
 *
 * @param display the display for the shell
 * @param handle the handle for the shell
 * @return a new shell object containing the specified display and handle
 *
 * @noreference This method is not intended to be referenced by clients.
 *
 * @since 3.3
 */
public static Shell internal_new (Display display, long handle) {
	return new Shell (display, null, SWT.NO_TRIM, handle, false);
}

static int checkStyle (Shell parent, int style) {
	style = Decorations.checkStyle (style);
	style &= ~SWT.TRANSPARENT;
	int mask = SWT.SYSTEM_MODAL | SWT.APPLICATION_MODAL | SWT.PRIMARY_MODAL;
	if ((style & SWT.SHEET) != 0) {
		style &= ~SWT.SHEET;
		style |= parent == null ? SWT.SHELL_TRIM : SWT.DIALOG_TRIM;
		if ((style & mask) == 0) {
			style |= parent == null ? SWT.APPLICATION_MODAL : SWT.PRIMARY_MODAL;
		}
	}
	int bits = style & ~mask;
	if ((style & SWT.SYSTEM_MODAL) != 0) return bits | SWT.SYSTEM_MODAL;
	if ((style & SWT.APPLICATION_MODAL) != 0) return bits | SWT.APPLICATION_MODAL;
	if ((style & SWT.PRIMARY_MODAL) != 0) return bits | SWT.PRIMARY_MODAL;
	return bits;
}

/**
 * Adds the listener to the collection of listeners who will
 * be notified when operations are performed on the receiver,
 * by sending the listener one of the messages defined in the
 * <code>ShellListener</code> interface.
 *
 * @param listener the listener which should be notified
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see ShellListener
 * @see #removeShellListener
 */
public void addShellListener (ShellListener listener) {
	addTypedListener(listener, SWT.Close, SWT.Iconify, SWT.Deiconify, SWT.Activate, SWT.Deactivate);
}

long balloonTipHandle () {
	if (balloonTipHandle == 0) createBalloonTipHandle ();
	return balloonTipHandle;
}

@Override
long callWindowProc (long hwnd, int msg, long wParam, long lParam) {
	if (handle == 0) return 0;
	if (hwnd == toolTipHandle || hwnd == balloonTipHandle || hwnd == menuItemToolTipHandle) {
		return OS.CallWindowProc (ToolTipProc, hwnd, msg, wParam, lParam);
	}
	if (hwndMDIClient != 0) {
		return OS.DefFrameProc (hwnd, hwndMDIClient, msg, wParam, lParam);
	}
	if (windowProc != 0) {
		return OS.CallWindowProc (windowProc, hwnd, msg, wParam, lParam);
	}
	if ((style & SWT.TOOL) != 0) {
		int trim = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX | SWT.BORDER | SWT.RESIZE;
		if ((style & trim) == 0) return OS.DefWindowProc (hwnd, msg, wParam, lParam);
	}
	if ((style & SWT.NO_MOVE) != 0) {
		setItemEnabled (OS.SC_MOVE, false);
	}
	if (parent != null) {
		switch (msg) {
			case OS.WM_KILLFOCUS:
			case OS.WM_SETFOCUS:
				return OS.DefWindowProc (hwnd, msg, wParam, lParam);
		}
		return OS.CallWindowProc (DialogProc, hwnd, msg, wParam, lParam);
	}
	return OS.DefWindowProc (hwnd, msg, wParam, lParam);
}

void center () {
	if (parent == null) return;
	Rectangle rect = getBoundsInPixels ();
	Rectangle parentRect = display.mapInPixels (parent, null, parent.getClientAreaInPixels());
	int x = Math.max (parentRect.x, parentRect.x + (parentRect.width - rect.width) / 2);
	int y = Math.max (parentRect.y, parentRect.y + (parentRect.height - rect.height) / 2);
	Rectangle monitorRect = parent.getMonitor ().getClientArea();
	if (x + rect.width > monitorRect.x + monitorRect.width) {
		x = Math.max (monitorRect.x, monitorRect.x + monitorRect.width - rect.width);
	} else {
		x = Math.max (x, monitorRect.x);
	}
	if (y + rect.height > monitorRect.y + monitorRect.height) {
		y = Math.max (monitorRect.y, monitorRect.y + monitorRect.height - rect.height);
	} else {
		y = Math.max (y, monitorRect.y);
	}
	setLocationInPixels (x, y);
}

/**
 * Requests that the window manager close the receiver in
 * the same way it would be closed when the user clicks on
 * the "close box" or performs some other platform specific
 * key or mouse combination that indicates the window
 * should be removed.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see SWT#Close
 * @see #dispose
 */
public void close () {
	checkWidget ();
	closeWidget ();
}

void createBalloonTipHandle () {
	balloonTipHandle = OS.CreateWindowEx (
		0,
		new TCHAR (0, OS.TOOLTIPS_CLASS, true),
		null,
		OS.TTS_ALWAYSTIP | OS.TTS_NOPREFIX | OS.TTS_BALLOON,
		OS.CW_USEDEFAULT, 0, OS.CW_USEDEFAULT, 0,
		handle,
		0,
		OS.GetModuleHandle (null),
		null);
	if (balloonTipHandle == 0) error (SWT.ERROR_NO_HANDLES);
	if (ToolTipProc == 0) {
		ToolTipProc = OS.GetWindowLongPtr (balloonTipHandle, OS.GWLP_WNDPROC);
	}
	/*
	* Feature in Windows.  Despite the fact that the
	* tool tip text contains \r\n, the tooltip will
	* not honour the new line unless TTM_SETMAXTIPWIDTH
	* is set.  The fix is to set TTM_SETMAXTIPWIDTH to
	* a large value.
	*/
	OS.SendMessage (balloonTipHandle, OS.TTM_SETMAXTIPWIDTH, 0, 0x7FFF);
	display.addControl (balloonTipHandle, this);
	OS.SetWindowLongPtr (balloonTipHandle, OS.GWLP_WNDPROC, display.windowProc);
}

void setTitleColoring(boolean preferred) {
	int attributeID = 0;
	if (OsVersion.IS_WIN10_2004) {
		// Documented since build 20348, but was already present since build 19041
		final int DWMWA_USE_IMMERSIVE_DARK_MODE = 20;
		attributeID = DWMWA_USE_IMMERSIVE_DARK_MODE;
	} else if (OsVersion.IS_WIN10_1809) {
		// Undocumented value
		attributeID = 19;
	} else {
		// Not supported
		return;
	}

	int[] value = new int[] {preferred ? 1 : 0};
	OS.DwmSetWindowAttribute (handle, attributeID, value, 4);
}

/**
 * Informs the operating system that the application prefers a dark
 * theme for native components such as title bars, scrollbars, and
 * native dialogs.
 *
 * @param preferred true if the dark theme is preferred, false otherwise.
 *
 * @since 3.134
 */
public void setDarkThemePreferred(boolean preferred) {
	checkWidget();
	setTitleColoring(preferred);
}

@Override
void createHandle () {
	boolean embedded = handle != 0 && (state & FOREIGN_HANDLE) == 0;

	/*
	* On Windows 98 and NT, setting a window to be the
	* top most window using HWND_TOPMOST can result in a
	* parent dialog shell being moved behind its parent
	* if the dialog has a sibling that is currently on top
	* This only occurs using SetWindowPos (), not when the
	* handle is created.
	*/
	/*
	* The following code is intentionally commented.
	*/
//	if ((style & SWT.ON_TOP) != 0) display.lockActiveWindow = true;
	if (handle == 0 || embedded) {
		super.createHandle ();
	} else {
		state |= CANVAS;
		if ((style & (SWT.H_SCROLL | SWT.V_SCROLL)) == 0) {
			state |= THEME_BACKGROUND;
		}
		windowProc = OS.GetWindowLongPtr (handle, OS.GWL_WNDPROC);
	}

	/*
	* The following code is intentionally commented.
	*/
//	if ((style & SWT.ON_TOP) != 0)  display.lockActiveWindow = false;

	if (!embedded) {
		if (display.useShellTitleColoring) {
			setTitleColoring(true);
		}

		int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
		bits &= ~(OS.WS_OVERLAPPED | OS.WS_CAPTION);
		bits |= OS.WS_POPUP;
		if ((style & SWT.TITLE) != 0) bits |= OS.WS_CAPTION;
		if ((style & SWT.NO_TRIM) == 0) {
			if ((style & (SWT.BORDER | SWT.RESIZE)) == 0) bits |= OS.WS_BORDER;
		}
		/*
		* Bug in Windows.  When the WS_CAPTION bits are cleared using
		* SetWindowLong(), Windows does not resize the client area of
		* the window to get rid of the caption until the first resize.
		* The fix is to use SetWindowPos() with SWP_DRAWFRAME to force
		* the frame to be redrawn and resized.
		*/
		OS.SetWindowLong (handle, OS.GWL_STYLE, bits);
		int flags = OS.SWP_DRAWFRAME | OS.SWP_NOMOVE | OS.SWP_NOSIZE | OS.SWP_NOZORDER | OS.SWP_NOACTIVATE;
		OS.SetWindowPos (handle, 0, 0, 0, 0, 0, flags);
	}
}

@Override
Point getInitialLocation() {
	long hwndParent = widgetParent ();
	// Set it to be near the top-left corner of the parent shell by default
	if (hwndParent != 0) {
		RECT rect = new RECT();
		OS.GetWindowRect(hwndParent, rect);
		return new Point(rect.left + 100, rect.top + 100);
	}
	return super.getInitialLocation();
}

void createMenuItemToolTipHandle() {
	menuItemToolTipHandle = createToolTipHandle (0);
}

void createToolTip (ToolTip toolTip) {
	int id = 0;
	if (toolTips == null) toolTips = new ToolTip [4];
	while (id < toolTips.length && toolTips [id] != null) id++;
	if (id == toolTips.length) {
		ToolTip [] newToolTips = new ToolTip [toolTips.length + 4];
		System.arraycopy (toolTips, 0, newToolTips, 0, toolTips.length);
		toolTips = newToolTips;
	}
	toolTips [id] = toolTip;
	toolTip.id = id + Display.ID_START;
	TOOLINFO lpti = new TOOLINFO ();
	lpti.cbSize = TOOLINFO.sizeof;
	lpti.hwnd = handle;
	lpti.uId = toolTip.id;
	lpti.uFlags = OS.TTF_TRACK;
	lpti.lpszText = OS.LPSTR_TEXTCALLBACK;
	OS.SendMessage (toolTip.hwndToolTip (), OS.TTM_ADDTOOL, 0, lpti);
}

void createToolTipHandle () {
	toolTipHandle = createToolTipHandle (handle);
}

long createToolTipHandle (long parent) {
	long toolTipHandle = OS.CreateWindowEx (
		0,
		new TCHAR (0, OS.TOOLTIPS_CLASS, true),
		null,
		OS.TTS_ALWAYSTIP | OS.TTS_NOPREFIX,
		OS.CW_USEDEFAULT, 0, OS.CW_USEDEFAULT, 0,
		parent,
		0,
		OS.GetModuleHandle (null),
		null);
	if (toolTipHandle == 0) error (SWT.ERROR_NO_HANDLES);
	if (ToolTipProc == 0) {
		ToolTipProc = OS.GetWindowLongPtr (toolTipHandle, OS.GWLP_WNDPROC);
	}
	/*
	* Feature in Windows.  Despite the fact that the
	* tool tip text contains \r\n, the tooltip will
	* not honour the new line unless TTM_SETMAXTIPWIDTH
	* is set.  The fix is to set TTM_SETMAXTIPWIDTH to
	* a large value.
	*/
	OS.SendMessage (toolTipHandle, OS.TTM_SETMAXTIPWIDTH, 0, 0x7FFF);
	display.addControl (toolTipHandle, this);
	OS.SetWindowLongPtr (toolTipHandle, OS.GWLP_WNDPROC, display.windowProc);
	return toolTipHandle;
}

@Override
void deregister () {
	super.deregister ();
	if (toolTipHandle != 0) display.removeControl (toolTipHandle);
	if (balloonTipHandle != 0) display.removeControl (balloonTipHandle);
	if (menuItemToolTipHandle != 0) display.removeControl (menuItemToolTipHandle);
}

void destroyToolTip (ToolTip toolTip) {
	if (toolTips == null) return;
	toolTips [toolTip.id - Display.ID_START] = null;
	if (balloonTipHandle != 0) {
		TOOLINFO lpti = new TOOLINFO ();
		lpti.cbSize = TOOLINFO.sizeof;
		lpti.uId = toolTip.id;
		lpti.hwnd = handle;
		OS.SendMessage (balloonTipHandle, OS.TTM_DELTOOL, 0, lpti);
	}
	toolTip.id = -1;
}

@Override
void destroyWidget () {
	fixActiveShell ();
	super.destroyWidget ();
}

@Override
void enableWidget (boolean enabled) {
	if (enabled) {
		state &= ~DISABLED;
	} else {
		state |= DISABLED;
	}
	if (Display.TrimEnabled) {
		if (isActive ()) setItemEnabled (OS.SC_CLOSE, enabled);
	} else {
		OS.EnableWindow (handle, enabled);
	}
}

@Override
long findBrush (long value, int lbStyle) {
	if (lbStyle == OS.BS_SOLID) {
		for (int element : SYSTEM_COLORS) {
			if (value == OS.GetSysColor (element)) {
				return OS.GetSysColorBrush (element);
			}
		}
	}
	if (brushes == null) brushes = new long [BRUSHES_SIZE];
	LOGBRUSH logBrush = new LOGBRUSH ();
	for (long hBrush : brushes) {
		if (hBrush == 0) break;
		OS.GetObject (hBrush, LOGBRUSH.sizeof, logBrush);
		switch (logBrush.lbStyle) {
			case OS.BS_SOLID:
				if (lbStyle == OS.BS_SOLID) {
					if (logBrush.lbColor == value) return hBrush;
				}
				break;
			case OS.BS_PATTERN:
				if (lbStyle == OS.BS_PATTERN) {
					if (logBrush.lbHatch == value) return hBrush;
				}
				break;
		}
	}
	int length = brushes.length;
	long hBrush = brushes [--length];
	if (hBrush != 0) OS.DeleteObject (hBrush);
	System.arraycopy (brushes, 0, brushes, 1, length);
	switch (lbStyle) {
		case OS.BS_SOLID:
			hBrush = OS.CreateSolidBrush ((int)value);
			break;
		case OS.BS_PATTERN:
			hBrush = OS.CreatePatternBrush (value);
			break;
	}
	return brushes [0] = hBrush;
}

@Override
Control findBackgroundControl () {
	return background != -1 || backgroundImage != null ? this : null;
}

@Override
Cursor findCursor () {
	return cursor;
}

@Override
Control findThemeControl () {
	return null;
}

ToolTip findToolTip (int id) {
	if (toolTips == null) return null;
	id = id - Display.ID_START;
	return 0 <= id && id < toolTips.length ? toolTips [id] : null;
}

void fixActiveShell () {
	/*
	* Feature in Windows.  When the active shell is disposed
	* or hidden, Windows normally makes the parent shell active
	* and assigns focus.  This does not happen when the parent
	* shell is disabled.  Instead, Windows assigns focus to the
	* next shell on the desktop (possibly a shell in another
	* application).  The fix is to activate the disabled parent
	* shell before disposing or hiding the active shell.
	*/
	long hwndParent = OS.GetParent (handle);
	if (hwndParent != 0 && handle == OS.GetActiveWindow ()) {
		if (!OS.IsWindowEnabled (hwndParent) && OS.IsWindowVisible (hwndParent)) {
			OS.SetActiveWindow (hwndParent);
		}
	}
}

void fixShell (Shell newShell, Control control) {
	if (this == newShell) return;
	if (control == lastActive) setActiveControl (null);
	String toolTipText = control.toolTipText;
	if (toolTipText != null) {
		control.setToolTipText (this, null);
		control.setToolTipText (newShell, toolTipText);
	}
}

void fixToolTip () {
	/*
	* Bug in Windows.  On XP, when a tooltip is
	* hidden due to a time out or mouse press,
	* the tooltip remains active although no
	* longer visible and won't show again until
	* another tooltip becomes active.  If there
	* is only one tooltip in the window,  it will
	* never show again.  The fix is to remove the
	* current tooltip and add it again every time
	* the mouse leaves the control.
	*/
	if (toolTipHandle == 0) return;
	TOOLINFO lpti = new TOOLINFO ();
	lpti.cbSize = TOOLINFO.sizeof;
	if (OS.SendMessage (toolTipHandle, OS.TTM_GETCURRENTTOOL, 0, lpti) != 0) {
		if ((lpti.uFlags & OS.TTF_IDISHWND) != 0) {
			OS.SendMessage (toolTipHandle, OS.TTM_DELTOOL, 0, lpti);
			OS.SendMessage (toolTipHandle, OS.TTM_ADDTOOL, 0, lpti);
		}
	}
	TOOLINFO lptiMt = new TOOLINFO ();
	lptiMt.cbSize = TOOLINFO.sizeof;
	if (OS.SendMessage (menuItemToolTipHandle, OS.TTM_GETCURRENTTOOL, 0, lptiMt) != 0) {
		if ((lptiMt.uFlags & OS.TTF_IDISHWND) != 0) {
			OS.SendMessage (menuItemToolTipHandle, OS.TTM_DELTOOL, 0, lptiMt);
			OS.SendMessage (menuItemToolTipHandle, OS.TTM_ADDTOOL, 0, lptiMt);
		}
	}
}

/**
 * If the receiver is visible, moves it to the top of the
 * drawing order for the display on which it was created
 * (so that all other shells on that display, which are not
 * the receiver's children will be drawn behind it) and forces
 * the window manager to make the shell active.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 2.0
 * @see Control#moveAbove
 * @see Control#setFocus
 * @see Control#setVisible
 * @see Display#getActiveShell
 * @see Decorations#setDefaultButton(Button)
 * @see Shell#open
 * @see Shell#setActive
 */
public void forceActive () {
	checkWidget ();
	if(!isVisible()) return;
	OS.SetForegroundWindow (handle);
}

@Override
void forceResize () {
	/* Do nothing */
}

/**
 * Returns the receiver's alpha value. The alpha value
 * is between 0 (transparent) and 255 (opaque).
 *
 * @return the alpha value
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.4
 */
public int getAlpha () {
	checkWidget ();
	byte [] pbAlpha = new byte [1];
	if (OS.GetLayeredWindowAttributes (handle, null, pbAlpha, null)) {
		return pbAlpha [0] & 0xFF;
	}
	return 0xFF;
}

@Override Rectangle getBoundsInPixels () {
	if (OS.IsIconic (handle)) return super.getBoundsInPixels ();
	RECT rect = new RECT ();
	OS.GetWindowRect (handle, rect);
	int width = rect.right - rect.left;
	int height = rect.bottom - rect.top;
	return new Rectangle.WithMonitor (rect.left, rect.top, width, height, getMonitor());
}

ToolTip getCurrentToolTip () {
	if (toolTipHandle != 0) {
		ToolTip tip = getCurrentToolTip (toolTipHandle);
		if (tip != null) return tip;
	}
	if (balloonTipHandle != 0) {
		ToolTip tip = getCurrentToolTip (balloonTipHandle);
		if (tip != null) return tip;
	}
	if (menuItemToolTipHandle != 0) {
		ToolTip tip = getCurrentToolTip (menuItemToolTipHandle);
		if (tip != null) return tip;
	}
	return null;
}

ToolTip getCurrentToolTip (long hwndToolTip) {
	if (hwndToolTip == 0) return null;
	if (OS.SendMessage (hwndToolTip, OS.TTM_GETCURRENTTOOL, 0, 0) != 0) {
		TOOLINFO lpti = new TOOLINFO ();
		lpti.cbSize = TOOLINFO.sizeof;
		if (OS.SendMessage (hwndToolTip, OS.TTM_GETCURRENTTOOL, 0, lpti) != 0) {
			if ((lpti.uFlags & OS.TTF_IDISHWND) == 0) return findToolTip ((int)lpti.uId);
		}
	}
	return null;
}

@Override
public boolean getEnabled () {
	checkWidget ();
	return (state & DISABLED) == 0;
}

/**
 * Returns <code>true</code> if the receiver is currently
 * in fullscreen state, and false otherwise.
 *
 * @return the fullscreen state
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.4
 */
public boolean getFullScreen () {
	checkWidget();
	return fullScreen;
}

/**
 * Returns the receiver's input method editor mode. This
 * will be the result of bitwise OR'ing together one or
 * more of the following constants defined in class
 * <code>SWT</code>:
 * <code>NONE</code>, <code>ROMAN</code>, <code>DBCS</code>,
 * <code>PHONETIC</code>, <code>NATIVE</code>, <code>ALPHA</code>.
 *
 * @return the IME mode
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see SWT
 */
public int getImeInputMode () {
	checkWidget ();
	if (!OS.IsDBLocale) return 0;
	long hIMC = OS.ImmGetContext (handle);
	int [] lpfdwConversion = new int [1], lpfdwSentence = new int [1];
	boolean open = OS.ImmGetOpenStatus (hIMC);
	if (open) open = OS.ImmGetConversionStatus (hIMC, lpfdwConversion, lpfdwSentence);
	OS.ImmReleaseContext (handle, hIMC);
	if (!open) return SWT.NONE;
	int result = 0;
	if ((lpfdwConversion [0] & OS.IME_CMODE_ROMAN) != 0) result |= SWT.ROMAN;
	if ((lpfdwConversion [0] & OS.IME_CMODE_FULLSHAPE) != 0) result |= SWT.DBCS;
	if ((lpfdwConversion [0] & OS.IME_CMODE_KATAKANA) != 0) return result | SWT.PHONETIC;
	if ((lpfdwConversion [0] & OS.IME_CMODE_NATIVE) != 0) return result | SWT.NATIVE;
	return result | SWT.ALPHA;
}

@Override Point getLocationInPixels () {
	if (OS.IsIconic (handle)) return super.getLocationInPixels ();
	RECT rect = new RECT ();
	OS.GetWindowRect (handle, rect);
	return new Point.WithMonitor (rect.left, rect.top, getMonitor());
}

@Override
public boolean getMaximized () {
	checkWidget ();
	return !fullScreen && super.getMaximized ();
}

/**
 * Returns a point describing the maximum receiver's size. The
 * x coordinate of the result is the maximum width of the receiver.
 * The y coordinate of the result is the maximum height of the
 * receiver.
 *
 * @return the receiver's size
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.116
 */
public Point getMaximumSize () {
	checkWidget ();
	return Win32DPIUtils.pixelToPointAsSize(getMaximumSizeInPixels(), getAutoscalingZoom());
}

Point getMaximumSizeInPixels () {
	int width = Math.min (Integer.MAX_VALUE, maxWidth);
	int trim = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX;
	if ((style & SWT.NO_TRIM) == 0 && (style & trim) != 0) {
		width = Math.min (width, getSystemMetrics (OS.SM_CXMAXTRACK));
	}
	int height = Math.min (Integer.MAX_VALUE, maxHeight);
	if ((style & SWT.NO_TRIM) == 0 && (style & trim) != 0) {
		if ((style & SWT.RESIZE) != 0) {
			height = Math.min (height, getSystemMetrics (OS.SM_CYMAXTRACK));
		} else {
			RECT rect = new RECT ();
			int bits1 = OS.GetWindowLong (handle, OS.GWL_STYLE);
			int bits2 = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
			adjustWindowRectEx(rect, bits1, false, bits2);
			height = Math.min (height, rect.bottom - rect.top);
		}
	}
	return new Point (width,  height);
}

/**
 * Returns a point describing the minimum receiver's size. The
 * x coordinate of the result is the minimum width of the receiver.
 * The y coordinate of the result is the minimum height of the
 * receiver.
 *
 * @return the receiver's size
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.1
 */
public Point getMinimumSize () {
	checkWidget ();
	return Win32DPIUtils.pixelToPointAsSize(getMinimumSizeInPixels(), getAutoscalingZoom());
}

Point getMinimumSizeInPixels () {
	int width = Math.max (0, minWidth);
	int trim = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX;
	if ((style & SWT.NO_TRIM) == 0 && (style & trim) != 0) {
		width = Math.max (width, getSystemMetrics (OS.SM_CXMINTRACK));
	}
	int height = Math.max (0, minHeight);
	if ((style & SWT.NO_TRIM) == 0 && (style & trim) != 0) {
		if ((style & SWT.RESIZE) != 0) {
			height = Math.max (height, getSystemMetrics (OS.SM_CYMINTRACK));
		} else {
			RECT rect = new RECT ();
			int bits1 = OS.GetWindowLong (handle, OS.GWL_STYLE);
			int bits2 = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
			adjustWindowRectEx(rect, bits1, false, bits2);
			height = Math.max (height, rect.bottom - rect.top);
		}
	}
	return new Point (width,  height);
}

/**
 * Gets the receiver's modified state.
 *
 * @return <code>true</code> if the receiver is marked as modified, or <code>false</code> otherwise
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.5
 */
public boolean getModified () {
	checkWidget ();
	return modified;
}

/**
 * Returns the region that defines the shape of the shell,
 * or <code>null</code> if the shell has the default shape.
 *
 * @return the region that defines the shape of the shell, or <code>null</code>
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.0
 */
@Override
public Region getRegion () {
	/* This method is needed for the @since 3.0 Javadoc */
	checkWidget ();
	return region;
}

@Override
public Shell getShell () {
	checkWidget ();
	return this;
}

@Override Point getSizeInPixels () {
	if (OS.IsIconic (handle)) return super.getSizeInPixels ();
	RECT rect = new RECT ();
	OS.GetWindowRect (handle, rect);
	int width = rect.right - rect.left;
	int height = rect.bottom - rect.top;
	return new Point (width, height);
}

/**
 * Returns an array containing all shells which are
 * descendants of the receiver.
 *
 * @return the dialog shells
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public Shell [] getShells () {
	checkWidget ();
	int count = 0;
	Shell [] shells = display.getShells ();
	for (Shell activeshell : shells) {
		Control shell = activeshell;
		do {
			shell = shell.getParent ();
		} while (shell != null && shell != this);
		if (shell == this) count++;
	}
	int index = 0;
	Shell [] result = new Shell [count];
	for (Shell activeshell : shells) {
		Control shell = activeshell;
		do {
			shell = shell.getParent ();
		} while (shell != null && shell != this);
		if (shell == this) {
			result [index++] = activeshell;
		}
	}
	return result;
}

/**
 * Returns a ToolBar object representing the tool bar that can be shown in the receiver's
 * trim. This will return <code>null</code> if the platform does not support tool bars that
 * are not part of the content area of the shell, or if the Shell's style does not support
 * having a tool bar.
 *
 * @return a ToolBar object representing the Shell's tool bar, or <code>null</code>.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.7
 */
public ToolBar getToolBar() {
	checkWidget ();
	return null;
}

/**
 * Returns the zoom of the shell.
 * <p>
 * Hint: The returned value is the zoom of the shell as originally considered by
 * the OS and not an adjusted zoom value as considered by SWT autoscaling capabilities.
 * </p>
 *
 * @return the zoom for this shell
 *
 * @since 3.133
 */
public int getZoom() {
	return DPIUtil.mapDPIToZoom(OS.GetDpiForWindow(handle));
}

@Override
Composite findDeferredControl () {
	return layoutCount > 0 ? this : null;
}

@Override
public boolean isEnabled () {
	checkWidget ();
	return getEnabled ();
}

@Override
public boolean isVisible () {
	checkWidget ();
	return getVisible ();
}

long hwndMDIClient () {
	if (hwndMDIClient == 0) {
		int widgetStyle = OS.MDIS_ALLCHILDSTYLES | OS.WS_CHILD | OS.WS_CLIPCHILDREN | OS.WS_CLIPSIBLINGS;
		hwndMDIClient = OS.CreateWindowEx (
			0,
			new TCHAR (0, "MDICLIENT", true),
			null,
			widgetStyle,
			0, 0, 0, 0,
			handle,
			0,
			OS.GetModuleHandle (null),
			new CREATESTRUCT ());
//		OS.ShowWindow (hwndMDIClient, OS.SW_SHOW);
	}
	return hwndMDIClient;
}

long menuItemToolTipHandle () {
	if (menuItemToolTipHandle == 0) createMenuItemToolTipHandle ();
	return menuItemToolTipHandle;
}

/**
 * Moves the receiver to the top of the drawing order for
 * the display on which it was created (so that all other
 * shells on that display, which are not the receiver's
 * children will be drawn behind it), marks it visible,
 * sets the focus and asks the window manager to make the
 * shell active.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see Control#moveAbove
 * @see Control#setFocus
 * @see Control#setVisible
 * @see Display#getActiveShell
 * @see Decorations#setDefaultButton(Button)
 * @see Shell#setActive
 * @see Shell#forceActive
 */
public void open () {
	checkWidget ();
	STARTUPINFO lpStartUpInfo = Display.lpStartupInfo;
	if (lpStartUpInfo == null || (lpStartUpInfo.dwFlags & OS.STARTF_USESHOWWINDOW) == 0) {
		bringToTop ();
		if (isDisposed ()) return;
	}
	OS.SendMessage (handle, OS.WM_CHANGEUISTATE, OS.UIS_INITIALIZE, 0);
	setVisible (true);
	if (isDisposed ()) return;
	/*
	* Bug in Windows XP.  Despite the fact that an icon has been
	* set for a window, the task bar displays the wrong icon the
	* first time the window is made visible with ShowWindow() after
	* a call to BringToTop(), when a long time elapses between the
	* ShowWindow() and the time the event queue is read.  The icon
	* in the window trimming is correct but the one in the task
	* bar does not get updated.  The fix is to call PeekMessage()
	* with the flag PM_NOREMOVE and PM_QS_SENDMESSAGE to respond
	* to a cross thread WM_GETICON.
	*
	* NOTE: This allows other cross thread messages to be delivered,
	* most notably WM_ACTIVATE.
	*/
	MSG msg = new MSG ();
	int flags = OS.PM_NOREMOVE | OS.PM_NOYIELD | OS.PM_QS_SENDMESSAGE;
	OS.PeekMessage (msg, 0, 0, 0, flags);
	/*
	 * When no widget has been given focus, or another push button has focus,
	 * give focus to the default button. This avoids overriding the default
	 * button.
	 */
	boolean restored = restoreFocus ();
	if (!restored) {
		restored = traverseGroup (true);
	}
	if (restored) {
		Control focusControl = display.getFocusControl ();
		if (focusControl instanceof Button && (focusControl.style & SWT.PUSH) != 0) {
			restored = false;
		}
	}
	if (!restored) {
		if (saveDefault != null && !saveDefault.isDisposed ()) {
			saveDefault.setFocus ();
		} else {
			setFocus ();
		}
	}
}

@Override
public boolean print (GC gc) {
	checkWidget ();
	if (gc == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (gc.isDisposed ()) error (SWT.ERROR_INVALID_ARGUMENT);
	// Print only the client area (children) without shell decorations
	forceResize ();
	Control [] children = _getChildren ();
	long gdipGraphics = gc.getGCData().gdipGraphics;
	for (Control child : children) {
		Rectangle bounds = child.getBounds();
		if (gdipGraphics != 0) {
			// For GDI+, translate the graphics object
			org.eclipse.swt.internal.gdip.Gdip.Graphics_TranslateTransform(gdipGraphics, bounds.x, bounds.y, org.eclipse.swt.internal.gdip.Gdip.MatrixOrderPrepend);
			child.print(gc);
			org.eclipse.swt.internal.gdip.Gdip.Graphics_TranslateTransform(gdipGraphics, -bounds.x, -bounds.y, org.eclipse.swt.internal.gdip.Gdip.MatrixOrderPrepend);
		} else {
			// For GDI, modify the world transform to add translation
			int state = OS.SaveDC(gc.handle);
			// Create a translation transform matrix
			float[] translateMatrix = new float[] {1, 0, 0, 1, bounds.x, bounds.y};
			// Multiply (prepend) the translation to the existing transform
			OS.ModifyWorldTransform(gc.handle, translateMatrix, OS.MWT_LEFTMULTIPLY);
			child.print(gc);
			OS.RestoreDC(gc.handle, state);
		}
	}
	return true;
}

@Override
void register () {
	super.register ();
	if (toolTipHandle != 0) display.addControl (toolTipHandle, this);
	if (balloonTipHandle != 0) display.addControl (balloonTipHandle, this);
	if (menuItemToolTipHandle != 0) display.addControl (menuItemToolTipHandle, this);
}

void releaseBrushes () {
	if (brushes != null) {
		for (long brush : brushes) {
			if (brush != 0) OS.DeleteObject (brush);
		}
	}
	brushes = null;
}

@Override
void releaseChildren (boolean destroy) {
	for (Shell shell : getShells ()) {
		if (shell != null && !shell.isDisposed ()) {
			shell.release (false);
		}
	}
	if (toolTips != null) {
		for (ToolTip toolTip : toolTips) {
			if (toolTip != null && !toolTip.isDisposed ()) {
				toolTip.release (false);
			}
		}
	}
	toolTips = null;
	super.releaseChildren (destroy);
}

@Override
void releaseHandle () {
	super.releaseHandle ();
	hwndMDIClient = 0;
}

@Override
void releaseParent () {
	/* Do nothing */
}

@Override
void releaseWidget () {
	super.releaseWidget ();
	releaseBrushes ();
	activeMenu = null;
	display.clearModal (this);
	if (lpstrTip != 0) {
		long hHeap = OS.GetProcessHeap ();
		OS.HeapFree (hHeap, 0, lpstrTip);
	}
	lpstrTip = 0;
	toolTipHandle = balloonTipHandle = menuItemToolTipHandle = 0;
	lastActive = null;
	toolTitle = balloonTitle = null;
}

@Override
void removeMenu (Menu menu) {
	super.removeMenu (menu);
	if (menu == activeMenu) activeMenu = null;
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when operations are performed on the receiver.
 *
 * @param listener the listener which should no longer be notified
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see ShellListener
 * @see #addShellListener
 */
public void removeShellListener (ShellListener listener) {
	checkWidget ();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (eventTable == null) return;
	eventTable.unhook (SWT.Close, listener);
	eventTable.unhook (SWT.Iconify,listener);
	eventTable.unhook (SWT.Deiconify,listener);
	eventTable.unhook (SWT.Activate, listener);
	eventTable.unhook (SWT.Deactivate, listener);
}

@Override
public void requestLayout () {
	layout (null, SWT.DEFER);
}

@Override
void reskinChildren (int flags) {
	for (Shell shell : getShells ()) {
		if (shell != null) shell.reskin (flags);
	}
	if (toolTips != null) {
		for (ToolTip toolTip : toolTips) {
			if (toolTip != null) toolTip.reskin (flags);
		}
	}
	super.reskinChildren (flags);
}

@Override
boolean sendKeyEvent (int type, int msg, long wParam, long lParam, Event event) {
	if (!isEnabled () || !isActive ()) return false;
	return super.sendKeyEvent (type, msg, wParam, lParam, event);
}

/**
 * If the receiver is visible, moves it to the top of the
 * drawing order for the display on which it was created
 * (so that all other shells on that display, which are not
 * the receiver's children will be drawn behind it) and asks
 * the window manager to make the shell active
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 2.0
 * @see Control#moveAbove
 * @see Control#setFocus
 * @see Control#setVisible
 * @see Display#getActiveShell
 * @see Decorations#setDefaultButton(Button)
 * @see Shell#open
 * @see Shell#setActive
 */
public void setActive () {
	checkWidget ();
	if (!isVisible ()) return;
	bringToTop ();
	// widget could be disposed at this point
}

void setActiveControl (Control control) {
	setActiveControl (control, SWT.None);
}

void setActiveControl (Control control, int type) {
	if (control != null && control.isDisposed ()) control = null;
	if (lastActive != null && lastActive.isDisposed ()) lastActive = null;
	if (lastActive == control) return;

	/*
	* Compute the list of controls to be activated and
	* deactivated by finding the first common parent
	* control.
	*/
	Control [] activate = (control == null) ? new Control [0] : control.getPath ();
	Control [] deactivate = (lastActive == null) ? new Control [0] : lastActive.getPath ();
	lastActive = control;
	int index = 0, length = Math.min (activate.length, deactivate.length);
	while (index < length) {
		if (activate [index] != deactivate [index]) break;
		index++;
	}

	/*
	* It is possible (but unlikely), that application
	* code could have destroyed some of the widgets. If
	* this happens, keep processing those widgets that
	* are not disposed.
	*/
	for (int i=deactivate.length-1; i>=index; --i) {
		if (!deactivate [i].isDisposed ()) {
			deactivate [i].sendEvent (SWT.Deactivate);
		}
	}
	for (int i=activate.length-1; i>=index; --i) {
		if (!activate [i].isDisposed ()) {
			Event event = new Event ();
			event.detail = type;
			activate [i].sendEvent (SWT.Activate, event);
		}
	}
}

/**
 * Sets the receiver's alpha value which must be
 * between 0 (transparent) and 255 (opaque).
 * <p>
 * This operation requires the operating system's advanced
 * widgets subsystem which may not be available on some
 * platforms.
 * </p>
 * @param alpha the alpha value
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.4
 */
public void setAlpha (int alpha) {
	checkWidget ();
	alpha &= 0xFF;
	int bits = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
	if (alpha == 0xFF) {
		OS.SetWindowLong (handle, OS.GWL_EXSTYLE, bits & ~OS.WS_EX_LAYERED);
		int flags = OS.RDW_ERASE | OS.RDW_INVALIDATE | OS.RDW_FRAME | OS.RDW_ALLCHILDREN;
		OS.RedrawWindow (handle, null, 0, flags);
	} else {
		OS.SetWindowLong (handle, OS.GWL_EXSTYLE, bits | OS.WS_EX_LAYERED);
		OS.SetLayeredWindowAttributes (handle, 0, (byte)alpha, OS.LWA_ALPHA);
	}
}

@Override
public Rectangle getBounds() {
	checkWidget ();
	return getDisplay().translateFromDisplayCoordinates(getBoundsInPixels());
}

@Override
public Point getLocation() {
	checkWidget ();
	return getDisplay().translateFromDisplayCoordinates(getLocationInPixels());
}

@Override
public void setLocation(Point location) {
	if (location == null) error (SWT.ERROR_NULL_ARGUMENT);
	checkWidget ();
	Point locationInPixels = getDisplay().translateToDisplayCoordinates(location);
	setLocationInPixels(locationInPixels.x, locationInPixels.y);
}

@Override
public void setLocation(int x, int y) {
	setLocation(new Point(x, y));
}

@Override
public void setBounds(Rectangle rect) {
	if (rect == null) error (SWT.ERROR_NULL_ARGUMENT);
	checkWidget ();
	Rectangle boundsInPixels = getDisplay().translateToDisplayCoordinates(rect);
	// The scaling of the width and height in case of a monitor change is handled by
	// the WM_DPICHANGED event processing. So to avoid duplicate scaling, we always
	// have to scale width and height with the zoom of the original monitor (still
	// returned by getZoom()) here.
	setBoundsInPixels(boundsInPixels.x, boundsInPixels.y, DPIUtil.pointToPixel(rect.width, getAutoscalingZoom()),
			DPIUtil.pointToPixel(rect.height, getAutoscalingZoom()));
}

@Override
public void setBounds(int x, int y, int width, int height) {
	setBounds(new Rectangle(x, y, width, height));
}

@Override
void setBoundsInPixels (int x, int y, int width, int height, int flags, boolean defer) {
	if (fullScreen) setFullScreen (false);
	/*
	* Bug in Windows.  When a window has alpha and
	* SetWindowPos() is called with SWP_DRAWFRAME,
	* the contents of the window are copied rather
	* than allowing the windows underneath to draw.
	* This causes pixel corruption.  The fix is to
	* clear the SWP_DRAWFRAME bits.
	*/
	int bits = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
	if ((bits & OS.WS_EX_LAYERED) != 0) {
		flags &= ~OS.SWP_DRAWFRAME;
	}
	super.setBoundsInPixels (x, y, width, height, flags, false);
}

@Override
public void setEnabled (boolean enabled) {
	checkWidget ();
	if (((state & DISABLED) == 0) == enabled) return;
	super.setEnabled (enabled);
	if (enabled && handle == OS.GetActiveWindow ()) {
		if (!restoreFocus ()) traverseGroup (true);
	}
}

/**
 * Sets the full screen state of the receiver.
 * If the argument is <code>true</code> causes the receiver
 * to switch to the full screen state, and if the argument is
 * <code>false</code> and the receiver was previously switched
 * into full screen state, causes the receiver to switch back
 * to either the maximized or normal states.
 * <p>
 * Note: The result of intermixing calls to <code>setFullScreen(true)</code>,
 * <code>setMaximized(true)</code>, <code>setMinimized(true)</code> and
 * <code>setMaximumSize</code> will vary by platform.
 * Typically, the behavior will match the platform user's
 * expectations, but not always. This should be avoided if possible.
 * </p>
 *
 * @param fullScreen the new fullscreen state
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.4
 */
public void setFullScreen (boolean fullScreen) {
	checkWidget();
	if (this.fullScreen == fullScreen) return;
	int stateFlags = fullScreen ? OS.SW_SHOWMAXIMIZED : OS.SW_RESTORE;
	int styleFlags = OS.GetWindowLong (handle, OS.GWL_STYLE);
	int mask = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX;
	if ((style & mask) != 0) {
		if (fullScreen) {
			styleFlags &= ~(OS.WS_CAPTION | OS.WS_MAXIMIZEBOX | OS.WS_MINIMIZEBOX | OS.WS_THICKFRAME);
		} else {
			styleFlags |= OS.WS_CAPTION;
			if ((style & SWT.MAX) != 0) styleFlags |= OS.WS_MAXIMIZEBOX;
			if ((style & SWT.MIN) != 0) styleFlags |= OS.WS_MINIMIZEBOX;
			if ((style & SWT.RESIZE) != 0) styleFlags |= OS.WS_THICKFRAME;
		}
	}
	if (fullScreen) wasMaximized = getMaximized ();
	boolean visible = isVisible ();
	if (!visible && !wasMaximized) {
		swFlags = stateFlags;
	}
	OS.SetWindowLong (handle, OS.GWL_STYLE, styleFlags);
	if (wasMaximized) {
		OS.ShowWindow (handle, OS.SW_HIDE);
		stateFlags = OS.SW_SHOWMAXIMIZED;
	}
	if (visible) OS.ShowWindow (handle, stateFlags);
	OS.UpdateWindow (handle);
	this.fullScreen = fullScreen;
}

/**
 * Sets the input method editor mode to the argument which
 * should be the result of bitwise OR'ing together one or more
 * of the following constants defined in class <code>SWT</code>:
 * <code>NONE</code>, <code>ROMAN</code>, <code>DBCS</code>,
 * <code>PHONETIC</code>, <code>NATIVE</code>, <code>ALPHA</code>.
 *
 * @param mode the new IME mode
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see SWT
 */
public void setImeInputMode (int mode) {
	checkWidget ();
	if (!OS.IsDBLocale) return;
	boolean imeOn = mode != SWT.NONE;
	long hIMC = OS.ImmGetContext (handle);
	OS.ImmSetOpenStatus (hIMC, imeOn);
	if (imeOn) {
		int [] lpfdwConversion = new int [1], lpfdwSentence = new int [1];
		if (OS.ImmGetConversionStatus (hIMC, lpfdwConversion, lpfdwSentence)) {
			int newBits = 0;
			int oldBits = OS.IME_CMODE_NATIVE | OS.IME_CMODE_KATAKANA;
			if ((mode & SWT.PHONETIC) != 0) {
				newBits = OS.IME_CMODE_KATAKANA | OS.IME_CMODE_NATIVE;
				oldBits = 0;
			} else {
				if ((mode & SWT.NATIVE) != 0) {
					newBits = OS.IME_CMODE_NATIVE;
					oldBits = OS.IME_CMODE_KATAKANA;
				}
			}
			boolean fullShape = (mode & SWT.DBCS) != 0;
			if ((mode & SWT.NATIVE) != 0) {
				long hkl = OS.GetKeyboardLayout (0);
				int langid = OS.PRIMARYLANGID (OS.LOWORD (hkl));
				if (langid == OS.LANG_JAPANESE) {
					fullShape = true;
				}
			}
			if (fullShape) {
				newBits |= OS.IME_CMODE_FULLSHAPE;
			} else {
				oldBits |= OS.IME_CMODE_FULLSHAPE;
			}
			if ((mode & SWT.ROMAN) != 0) {
				newBits |= OS.IME_CMODE_ROMAN;
			} else {
				oldBits |= OS.IME_CMODE_ROMAN;
			}
			lpfdwConversion [0] |= newBits;
			lpfdwConversion [0] &= ~oldBits;
			OS.ImmSetConversionStatus (hIMC, lpfdwConversion [0], lpfdwSentence [0]);
		}
	}
	OS.ImmReleaseContext (handle, hIMC);
}

/**
 * Sets the receiver's maximum size to the size specified by the arguments.
 * If the new maximum size is smaller than the current size of the receiver,
 * the receiver is resized to the new maximum size.
 * <p>
 * Note: The result of intermixing calls to <code>setMaximumSize</code> and
 * <code>setFullScreen(true)</code> will vary by platform.
 * Typically, the behavior will match the platform user's
 * expectations, but not always. This should be avoided if possible.
 * </p>
 * @param width the new maximum width for the receiver
 * @param height the new maximum height for the receiver
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.116
 */
public void setMaximumSize (int width, int height) {
	checkWidget ();
	int zoom = getAutoscalingZoom();
	setMaximumSizeInPixels(DPIUtil.pointToPixel(width, zoom), DPIUtil.pointToPixel(height, zoom));
}

/**
 * Sets the receiver's maximum size to the size specified by the argument.
 * If the new maximum size is smaller than the current size of the receiver,
 * the receiver is resized to the new maximum size.
 * <p>
 * Note: The result of intermixing calls to <code>setMaximumSize</code> and
 * <code>setFullScreen(true)</code> will vary by platform.
 * Typically, the behavior will match the platform user's
 * expectations, but not always. This should be avoided if possible.
 * </p>
 * @param size the new maximum size for the receiver
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the point is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.116
 */
public void setMaximumSize (Point size) {
	checkWidget ();
	if (size == null) error (SWT.ERROR_NULL_ARGUMENT);
	size = Win32DPIUtils.pointToPixelAsSize(size, getAutoscalingZoom());
	setMaximumSizeInPixels(size.x, size.y);
}

void setMaximumSizeInPixels (int width, int height) {
	int widthLimit = 0, heightLimit = 0;
	int trim = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX;
	if ((style & SWT.NO_TRIM) == 0 && (style & trim) != 0) {
		widthLimit = getSystemMetrics (OS.SM_CXMAXTRACK);
		if ((style & SWT.RESIZE) != 0) {
			heightLimit = getSystemMetrics (OS.SM_CYMAXTRACK);
		} else {
			RECT rect = new RECT ();
			int bits1 = OS.GetWindowLong (handle, OS.GWL_STYLE);
			int bits2 = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
			adjustWindowRectEx(rect, bits1, false, bits2);
			heightLimit = rect.bottom - rect.top;
		}
	}
	maxWidth = Math.min (widthLimit, width);
	maxHeight = Math.min (heightLimit, height);
	Point size = getSizeInPixels ();
	int newWidth = Math.min (size.x, maxWidth);
	int newHeight = Math.min (size.y, maxHeight);
	if (maxWidth >= widthLimit) maxWidth = SWT.DEFAULT;
	if (maxHeight >= heightLimit) maxHeight = SWT.DEFAULT;
	if (newWidth != size.x || newHeight != size.y) setSizeInPixels (newWidth, newHeight);
}

/**
 * Sets the receiver's minimum size to the size specified by the arguments.
 * If the new minimum size is larger than the current size of the receiver,
 * the receiver is resized to the new minimum size.
 *
 * @param width the new minimum width for the receiver
 * @param height the new minimum height for the receiver
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.1
 */
public void setMinimumSize (int width, int height) {
	checkWidget ();
	int zoom = getAutoscalingZoom();
	setMinimumSizeInPixels(DPIUtil.pointToPixel(width, zoom), DPIUtil.pointToPixel(height, zoom));
}

void setMinimumSizeInPixels (int width, int height) {
	int widthLimit = 0, heightLimit = 0;
	int trim = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX;
	if ((style & SWT.NO_TRIM) == 0 && (style & trim) != 0) {
		widthLimit = getSystemMetrics (OS.SM_CXMINTRACK);
		if ((style & SWT.RESIZE) != 0) {
			heightLimit = getSystemMetrics (OS.SM_CYMINTRACK);
		} else {
			RECT rect = new RECT ();
			int bits1 = OS.GetWindowLong (handle, OS.GWL_STYLE);
			int bits2 = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
			adjustWindowRectEx(rect, bits1, false, bits2);
			heightLimit = rect.bottom - rect.top;
		}
	}
	minWidth = Math.max (widthLimit, width);
	minHeight = Math.max (heightLimit, height);
	Point size = getSizeInPixels ();
	int newWidth = Math.max (size.x, minWidth);
	int newHeight = Math.max (size.y, minHeight);
	if (minWidth <= widthLimit) minWidth = SWT.DEFAULT;
	if (minHeight <= heightLimit) minHeight = SWT.DEFAULT;
	if (newWidth != size.x || newHeight != size.y) setSizeInPixels (newWidth, newHeight);
}

/**
 * Sets the receiver's minimum size to the size specified by the argument.
 * If the new minimum size is larger than the current size of the receiver,
 * the receiver is resized to the new minimum size.
 *
 * @param size the new minimum size for the receiver
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the point is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.1
 */
public void setMinimumSize (Point size) {
	checkWidget ();
	if (size == null) error (SWT.ERROR_NULL_ARGUMENT);
	size = Win32DPIUtils.pointToPixelAsSize(size, getAutoscalingZoom());
	setMinimumSizeInPixels(size.x, size.y);
}

/**
 * Sets the receiver's modified state as specified by the argument.
 *
 * @param modified the new modified state for the receiver
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.5
 */
public void setModified (boolean modified) {
	checkWidget ();
	this.modified = modified;
}

void setItemEnabled (int cmd, boolean enabled) {
	long hMenu = OS.GetSystemMenu (handle, false);
	if (hMenu == 0) return;
	int flags = OS.MF_ENABLED;
	if (!enabled) flags = OS.MF_DISABLED | OS.MF_GRAYED;
	OS.EnableMenuItem (hMenu, cmd, OS.MF_BYCOMMAND | flags);
}

@Override
void setParent () {
	/* Do nothing.  Not necessary for Shells */
}

/**
 * Sets the shape of the shell to the region specified
 * by the argument.  When the argument is null, the
 * default shape of the shell is restored.  The shell
 * must be created with the style SWT.NO_TRIM in order
 * to specify a region.
 * <p>
 * NOTE: This method also sets the size of the shell. Clients should
 * not call {@link #setSize} or {@link #setBounds} on this shell.
 * Furthermore, the passed region should not be modified any more.
 * </p>
 *
 * @param region the region that defines the shape of the shell (or null)
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the region has been disposed</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.0
 */
@Override
public void setRegion (Region region) {
	checkWidget ();
	if ((style & SWT.NO_TRIM) == 0) return;
	if (region != null) {
		Rectangle bounds = region.getBounds ();
		setSize (bounds.x + bounds.width, bounds.y + bounds.height);
	}
	super.setRegion (region);
}

void setToolTipText (long hwnd, String text) {
	TOOLINFO lpti = new TOOLINFO ();
	lpti.cbSize = TOOLINFO.sizeof;
	lpti.hwnd = handle;
	lpti.uId = hwnd;
	long hwndToolTip = toolTipHandle ();
	maybeEnableDarkSystemTheme(hwndToolTip);

	if (text == null) {
		// Empty text, tool no longer needed, get rid of it
		OS.SendMessage (hwndToolTip, OS.TTM_DELTOOL, 0, lpti);
		return;
	}

	if (OS.SendMessage (hwndToolTip, OS.TTM_GETTOOLINFO, 0, lpti) == 0) {
		// Non-empty text again, create tool
		lpti.uFlags = OS.TTF_IDISHWND | OS.TTF_SUBCLASS;
		lpti.lpszText = OS.LPSTR_TEXTCALLBACK;
		OS.SendMessage (hwndToolTip, OS.TTM_ADDTOOL, 0, lpti);
		return;
	}

	// Previous `TTM_GETTOOLINFO` was sent to specific tool, which is likely set to `LPSTR_TEXTCALLBACK`.
	// In this case, WINAPI will set `TOOLINFO.lpszText` to `LPSTR_TEXTCALLBACK` (numerically -1).
	// Now we're sending `TTM_GETCURRENTTOOL`, which may be sent to a different tool.
	// If it happens to have text other than `LPSTR_TEXTCALLBACK`, WINAPI will try to copy it for us.
	// `TOOLINFO.lpszText` must be either NULL or point to valid buffer, or there will be a native crash.
	// We only want to check visible, so set to NULL.
	lpti.lpszText = 0;

	// Updating invisible tooltip reportedly causes issues, see Bug 495473
	boolean isCurrentlyVisible =
		(OS.SendMessage (hwndToolTip, OS.TTM_GETCURRENTTOOL, 0, lpti) != 0) &&
		(lpti.uId == hwnd);

	if (isCurrentlyVisible) {
		// Tool was already present and visible.
		// Need to update it.
		OS.SendMessage (hwndToolTip, OS.TTM_UPDATE, 0, 0);
	}
}

void setToolTipText (NMTTDISPINFO lpnmtdi, char [] buffer) {
	/*
	* Ensure that the current position of the mouse
	* is inside the client area of the shell.  This
	* prevents tool tips from popping up over the
	* shell trimmings.
	*/
	if (!hasCursor ()) return;
	long hHeap = OS.GetProcessHeap ();
	if (lpstrTip != 0) OS.HeapFree (hHeap, 0, lpstrTip);
	int byteCount = buffer.length * 2;
	lpstrTip = OS.HeapAlloc (hHeap, OS.HEAP_ZERO_MEMORY, byteCount);
	OS.MoveMemory (lpstrTip, buffer, byteCount);
	lpnmtdi.lpszText = lpstrTip;
}

void setToolTipTitle (long hwndToolTip, String text, int icon) {
	/*
	* Bug in Windows.  For some reason, when TTM_SETTITLE
	* is used to set the title of a tool tip, Windows leaks
	* GDI objects.  This happens even when TTM_SETTITLE is
	* called with TTI_NONE and NULL.  The documentation
	* states that Windows copies the icon and that the
	* programmer must free the copy but does not provide
	* API to get the icon.  For example, when TTM_SETTITLE
	* is called with ICON_ERROR, when TTM_GETTITLE is used
	* to query the title and the icon, the uTitleBitmap
	* field in the TTGETTITLE struct is zero.  The fix
	* is to remember these values, only set them when then
	* change and leak less.
	*
	* NOTE:  This only happens on Vista.
	*/
	if (hwndToolTip != toolTipHandle && hwndToolTip != balloonTipHandle && hwndToolTip != menuItemToolTipHandle) {
		return;
	}
	if (hwndToolTip == toolTipHandle || hwndToolTip == menuItemToolTipHandle) {
		if (text == toolTitle || (toolTitle != null && toolTitle.equals (text))) {
			if (icon == toolIcon) return;
		}
		toolTitle = text;
		toolIcon = icon;
	} else {
		if (hwndToolTip == balloonTipHandle) {
			if (text == balloonTitle || (balloonTitle != null && balloonTitle.equals (text))) {
				if (icon == toolIcon) return;
			}
			balloonTitle = text;
			balloonIcon = icon;
		}
	}
	if (text != null) {
		/*
		* Feature in Windows. The text point to by pszTitle
		* must not exceed 100 characters in length, including
		* the null terminator.
		*/
		if (text.length () > 99) text = text.substring (0, 99);
		TCHAR pszTitle = new TCHAR (getCodePage (), text, true);
		OS.SendMessage (hwndToolTip, OS.TTM_SETTITLE, icon, pszTitle);
	} else {
		OS.SendMessage (hwndToolTip, OS.TTM_SETTITLE, 0, 0);
	}
}

@Override
public void setVisible (boolean visible) {
	checkWidget ();
	/*
	* Feature in Windows.  When ShowWindow() is called used to hide
	* a window, Windows attempts to give focus to the parent. If the
	* parent is disabled by EnableWindow(), focus is assigned to
	* another windows on the desktop.  This means that if you hide
	* a modal window before the parent is enabled, the parent will
	* not come to the front.  The fix is to change the modal state
	* before hiding or showing a window so that this does not occur.
	*/
	int mask = SWT.PRIMARY_MODAL | SWT.APPLICATION_MODAL | SWT.SYSTEM_MODAL;
	if ((style & mask) != 0) {
		if (visible) {
			display.setModalShell (this);
			if ((style & (SWT.APPLICATION_MODAL | SWT.SYSTEM_MODAL)) != 0) {
				display.setModalDialog (null);
			}
			Control control = display._getFocusControl ();
			if (control != null && !control.isActive ()) {
				bringToTop ();
				if (isDisposed ()) return;
			}
			long hwndShell = OS.GetActiveWindow ();
			if (hwndShell == 0) {
				if (parent != null) hwndShell = parent.handle;
			}
			if (hwndShell != 0) {
				OS.SendMessage (hwndShell, OS.WM_CANCELMODE, 0, 0);
			}
			OS.ReleaseCapture ();
		} else {
			display.clearModal (this);
		}
	} else {
		updateModal ();
	}

	/*
	* Bug in Windows.  Calling ShowOwnedPopups() to hide the
	* child windows of a hidden window causes the application
	* to be deactivated.  The fix is to call ShowOwnedPopups()
	* to hide children before hiding the parent.
	*/
	if (showWithParent && !visible) {
		OS.ShowOwnedPopups (handle, false);
	}
	if (!visible) fixActiveShell ();
	if (visible && center && !moved) {
		center ();
		if (isDisposed ()) return;
	}
	super.setVisible (visible);
	if (isDisposed ()) return;
	if (showWithParent != visible) {
		showWithParent = visible;
		if (visible) {
			OS.ShowOwnedPopups (handle, true);
		}
	}

	/* Make the foreign window parent appear in the task bar */
	if (visible) {
		if (parent != null && (parent.state & FOREIGN_HANDLE) != 0) {
			long hwndParent = parent.handle;
			int style = OS.GetWindowLong (hwndParent, OS.GWL_EXSTYLE);
			if ((style & OS.WS_EX_TOOLWINDOW) != 0) {
				OS.SetWindowLong (hwndParent, OS.GWL_EXSTYLE, style & ~OS.WS_EX_TOOLWINDOW);
				/*
				* Bug in Windows.  The window does not show in the task bar when
				* WS_EX_TOOLWINDOW is removed after the window has already been shown.
				* The fix is to hide and shown the shell.
				*/
				OS.ShowWindow (hwndParent, OS.SW_HIDE);
				OS.ShowWindow (hwndParent, OS.SW_RESTORE);
			}
		}
	}
}

@Override
void subclass () {
	super.subclass ();
	if (ToolTipProc != 0) {
		long newProc = display.windowProc;
		if (toolTipHandle != 0) {
			OS.SetWindowLongPtr (toolTipHandle, OS.GWLP_WNDPROC, newProc);
		}
		if (balloonTipHandle != 0) {
			OS.SetWindowLongPtr (balloonTipHandle, OS.GWLP_WNDPROC, newProc);
		}
		if (menuItemToolTipHandle != 0) {
			OS.SetWindowLongPtr (menuItemToolTipHandle, OS.GWLP_WNDPROC, newProc);
		}
	}
}

long toolTipHandle () {
	if (toolTipHandle == 0) createToolTipHandle ();
	return toolTipHandle;
}

@Override
boolean translateAccelerator (MSG msg) {
	if (!isEnabled () || !isActive ()) return false;
	if (menuBar != null && !menuBar.isEnabled ()) return false;
	return translateMDIAccelerator (msg) || translateMenuAccelerator (msg);
}

@Override
boolean traverseEscape () {
	if (parent == null) return false;
	if (!isVisible () || !isEnabled ()) return false;
	close ();
	return true;
}

@Override
void unsubclass () {
	super.unsubclass ();
	if (ToolTipProc != 0) {
		if (toolTipHandle != 0) {
			OS.SetWindowLongPtr (toolTipHandle, OS.GWLP_WNDPROC, ToolTipProc);
		}
		if (toolTipHandle != 0) {
			OS.SetWindowLongPtr (toolTipHandle, OS.GWLP_WNDPROC, ToolTipProc);
		}
		if (menuItemToolTipHandle != 0) {
			OS.SetWindowLongPtr (menuItemToolTipHandle, OS.GWLP_WNDPROC, ToolTipProc);
		}
	}
}

void updateModal () {
	if (Display.TrimEnabled) {
		setItemEnabled (OS.SC_CLOSE, isActive ());
	} else {
		OS.EnableWindow (handle, isActive ());
	}
}

@Override
CREATESTRUCT widgetCreateStruct () {
	return null;
}

@Override
long widgetParent () {
	if (handle != 0) return handle;
	return parent != null ? parent.handle : 0;
}

@Override
int widgetExtStyle () {
	int bits = super.widgetExtStyle () & ~OS.WS_EX_MDICHILD;
	if ((style & SWT.TOOL) != 0) bits |= OS.WS_EX_TOOLWINDOW;

	/*
	* Feature in Windows.  When a window that does not have a parent
	* is created, it is automatically added to the Windows Task Bar,
	* even when it has no title.  The fix is to use WS_EX_TOOLWINDOW
	* which does not cause the window to appear in the Task Bar.
	*/
	if (parent == null) {
		if ((style & SWT.ON_TOP) != 0) {
			int trim = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX;
			if ((style & SWT.NO_TRIM) != 0 || (style & trim) == 0) {
				bits |= OS.WS_EX_TOOLWINDOW;
			}
		}
	}

	if ((style & SWT.ON_TOP) != 0) bits |= OS.WS_EX_TOPMOST;
	return bits;
}

@Override
TCHAR windowClass () {
	if ((style & SWT.TOOL) != 0) {
		int trim = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX | SWT.BORDER | SWT.RESIZE;
		if ((style & trim) == 0) return display.windowShadowClass;
	}
	return parent != null ? DialogClass : super.windowClass ();
}

@Override
long windowProc () {
	if (windowProc != 0) return windowProc;
	if ((style & SWT.TOOL) != 0) {
		int trim = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX | SWT.BORDER | SWT.RESIZE;
		if ((style & trim) == 0) return super.windowProc ();
	}
	return parent != null ? DialogProc : super.windowProc ();
}

Rectangle getClientRectInWindow () {
	RECT windowRect = new RECT ();
	OS.GetWindowRect (handle, windowRect);

	POINT clientWindowLT = new POINT ();
	OS.ClientToScreen (handle, clientWindowLT);
	clientWindowLT.x -= windowRect.left;
	clientWindowLT.y -= windowRect.top;

	RECT clientRect = new RECT ();
	OS.GetClientRect (handle, clientRect);

	return new Rectangle(
			clientWindowLT.x + clientRect.left,
			clientWindowLT.y + clientRect.top,
			clientRect.right - clientRect.left,
			clientRect.bottom - clientRect.top);
}

void overpaintMenuBorder () {
	if ((menuBar == null) || (display.menuBarBorderPen == 0)) return;

	Rectangle clientArea = getClientRectInWindow();
	long dc = OS.GetWindowDC (handle);
	long oldPen = OS.SelectObject (dc, display.menuBarBorderPen);
	OS.MoveToEx (dc, clientArea.x, clientArea.y - 1, 0);
	OS.LineTo (dc, clientArea.x + clientArea.width, clientArea.y - 1);
	OS.SelectObject (dc, oldPen);
	OS.ReleaseDC (handle, dc);
}

/**
 * Fills the remaining area which are not painted by MenuBar and ClientArea
 * inside the shell window.
 */
private void fillUnpaintedRegionInShellWindow() {
	if (menuBar == null) return;
	Rectangle clientArea = getClientRectInWindow();
	Rectangle menuArea = menuBar.getBounds();
	Rectangle windowBounds = getBoundsInPixels();
	menuArea.x = menuArea.x - windowBounds.x;
	menuArea.y = menuArea .y - windowBounds.y;
	long windowRegion = OS.CreateRectRgn (0, 0, windowBounds.width, windowBounds.height);
	long menuRegion = OS.CreateRectRgn (menuArea.x, menuArea.y, menuArea.x + menuArea.width, menuArea.y + menuArea.height);
	long clientRegion = OS.CreateRectRgn (clientArea.x, clientArea.y, clientArea.x + clientArea.width, clientArea.y + clientArea.height);
	OS.CombineRgn (windowRegion, windowRegion, menuRegion, OS.RGN_DIFF);
	OS.CombineRgn (windowRegion, windowRegion, clientRegion, OS.RGN_DIFF);
	OS.DeleteObject (menuRegion);
	OS.DeleteObject (clientRegion);
	int dwRop = display.useDarkModeExplorerTheme ? OS.BLACKNESS : OS.PATCOPY;
	long dc = OS.GetWindowDC (handle);
	POINT pt = null;
	pt = new POINT();
	OS.GetWindowOrgEx(dc, pt);
	OS.OffsetRgn(windowRegion, -pt.x, -pt.y);
	OS.SelectClipRgn(dc, windowRegion);
	OS.OffsetRgn(windowRegion, pt.x, pt.y);
	OS.PatBlt(dc, 0, 0, windowBounds.width, windowBounds.height, dwRop);
	OS.DeleteObject (windowRegion);
	OS.ReleaseDC (handle, dc);
}

@Override
long windowProc (long hwnd, int msg, long wParam, long lParam) {
	if (handle == 0) return 0;
	if((style & SWT.NO_MOVE) != 0 && msg == OS.WM_NCLBUTTONDOWN && wParam == OS.HTCAPTION) return 0;
	if (hwnd == toolTipHandle || hwnd == balloonTipHandle || hwnd == menuItemToolTipHandle) {
		switch (msg) {
			case OS.WM_TIMER: {
				if (wParam != ToolTip.TIMER_ID) break;
				ToolTip tip = getCurrentToolTip (hwnd);
				if (tip != null && tip.autoHide) {
					tip.setVisible (false);
				}
				break;
			}
			case OS.WM_LBUTTONDOWN: {
				ToolTip tip = getCurrentToolTip (hwnd);
				if (tip != null) {
					tip.setVisible (false);
					tip.sendSelectionEvent (SWT.Selection);
				}
				break;
			}
		}
		return callWindowProc (hwnd, msg, wParam, lParam);
	}
	if (hwnd == handle) {
		if (msg == Display.TASKBARBUTTONCREATED) {
			if (display.taskBar != null) {
				for (TaskItem item : display.taskBar.items) {
					if (item != null && item.shell == this) {
						item.onTaskbarButtonCreated();
						break;
					}
				}
			}
		}
	}

	switch (msg) {
		case OS.WM_NCACTIVATE:
		case OS.WM_NCPAINT:
		{
			long ret = super.windowProc (hwnd, msg, wParam, lParam);
			overpaintMenuBorder();
			fillUnpaintedRegionInShellWindow();
			return ret;
		}
	}

	return super.windowProc (hwnd, msg, wParam, lParam);
}

@Override
int widgetStyle () {
	int bits = super.widgetStyle ();
	if (handle != 0) return bits | OS.WS_CHILD;
	bits &= ~OS.WS_CHILD;

	/*
	* Use WS_OVERLAPPED for all windows, either dialog or top level
	* so that CreateWindowEx () will respect CW_USEDEFAULT and set
	* the default window location and size.
	*
	* NOTE:  When a WS_OVERLAPPED window is created, Windows gives
	* the new window WS_CAPTION style bits.  These two constants are
	* as follows:
	*
	* 	WS_OVERLAPPED = 0
	* 	WS_CAPTION = WS_BORDER | WS_DLGFRAME
	*/
	return bits | OS.WS_OVERLAPPED | OS.WS_CAPTION;
}

@Override
LRESULT WM_ACTIVATE (long wParam, long lParam) {
	/* Process WM_ACTIVATE */
	LRESULT result = super.WM_ACTIVATE (wParam, lParam);
	if (OS.LOWORD (wParam) == 0) {
		if (lParam == 0 || (lParam != toolTipHandle && lParam != balloonTipHandle
				&& lParam != menuItemToolTipHandle)) {
			ToolTip tip = getCurrentToolTip ();
			if (tip != null) tip.setVisible (false);
		}
	}
	return parent != null ? LRESULT.ZERO : result;
}

@Override
LRESULT WM_DESTROY (long wParam, long lParam) {
	LRESULT result = super.WM_DESTROY (wParam, lParam);
	/*
	* When the shell is a WS_CHILD window of a non-SWT
	* window, the destroy code does not get called because
	* the non-SWT window does not call dispose ().  Instead,
	* the destroy code is called here in WM_DESTROY.
	*/
	int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
	if ((bits & OS.WS_CHILD) != 0) {
		releaseParent ();
		release (false);
	}
	return result;
}

@Override
LRESULT WM_DISPLAYCHANGE (long wParam, long lParam) {
	if (getDisplay().isRescalingAtRuntime()) {
		Device.win32_destroyUnusedHandles(getDisplay());
		return LRESULT.ZERO;
	}
	return LRESULT.ONE;
}

@Override
LRESULT WM_DPICHANGED (long wParam, long lParam) {
	// Map DPI to Zoom and compare
	int newNativeZoom = DPIUtil.mapDPIToZoom (OS.HIWORD (wParam));
	if (getDisplay().isRescalingAtRuntime()) {
		Device.win32_destroyUnusedHandles(getDisplay());
		RECT rect = new RECT ();
		COM.MoveMemory(rect, lParam, RECT.sizeof);
		Rectangle newBoundsInPixels = new Rectangle(rect.left, rect.top, rect.right - rect.left, rect.bottom-rect.top);
		handleMonitorSpecificDpiChange(newNativeZoom, newBoundsInPixels);
		return LRESULT.ZERO;
	} else {
		int newZoom = DPIUtil.getZoomForAutoscaleProperty (newNativeZoom);
		int oldZoom = DPIUtil.getZoomForAutoscaleProperty (nativeZoom);
		if (newZoom != oldZoom) {
			// Throw the DPI change event if zoom value changes
			Event event = new Event();
			event.type = SWT.ZoomChanged;
			event.widget = this;
			event.detail = DPIUtil.getZoomForAutoscaleProperty(newNativeZoom);
			event.doit = true;
			notifyListeners(SWT.ZoomChanged, event);
			return LRESULT.ZERO;
		}
	}
	return LRESULT.ONE;
}

private void handleMonitorSpecificDpiChange(int newNativeZoom, Rectangle newBoundsInPixels) {
	DPIUtil.setDeviceZoom (newNativeZoom);
	// Do not process DPI change for child shells asynchronous to avoid relayouting when
	// repositioning the child shell to a different monitor upon opening
	boolean processDpiChangeAsynchronous = getParent() == null;
	Event zoomChangedEvent = createZoomChangedEvent(newNativeZoom, processDpiChangeAsynchronous);
	if (lastDpiChangeEvent != null) {
		lastDpiChangeEvent.doit = false;
	}
	lastDpiChangeEvent = zoomChangedEvent;
	notifyListeners(SWT.ZoomChanged, zoomChangedEvent);
	this.setBoundsInPixels(newBoundsInPixels.x, newBoundsInPixels.y, newBoundsInPixels.width, newBoundsInPixels.height);
}

@Override
LRESULT WM_ENTERIDLE (long wParam, long lParam) {
	LRESULT result = super.WM_ENTERIDLE (wParam, lParam);
	if (result != null) return result;
	Display display = this.display;
	if (display.runAsyncMessages (false)) display.wakeThread ();
	return result;
}

@Override
LRESULT WM_GETMINMAXINFO (long wParam, long lParam) {
	LRESULT result = super.WM_GETMINMAXINFO (wParam, lParam);
	if (result != null) return result;
	if (minWidth != SWT.DEFAULT || minHeight != SWT.DEFAULT
			|| maxWidth != SWT.DEFAULT || maxHeight != SWT.DEFAULT) {
		MINMAXINFO info = new MINMAXINFO ();
		OS.MoveMemory (info, lParam, MINMAXINFO.sizeof);
		if (minWidth != SWT.DEFAULT) info.ptMinTrackSize_x = minWidth;
		if (minHeight != SWT.DEFAULT) info.ptMinTrackSize_y = minHeight;
		if (maxWidth != SWT.DEFAULT) info.ptMaxTrackSize_x = maxWidth;
		if (maxHeight != SWT.DEFAULT) info.ptMaxTrackSize_y = maxHeight;
		OS.MoveMemory (lParam, info, MINMAXINFO.sizeof);
		return LRESULT.ZERO;
	}
	return result;
}

@Override
LRESULT WM_MOUSEACTIVATE (long wParam, long lParam) {
	LRESULT result = super.WM_MOUSEACTIVATE (wParam, lParam);
	if (result != null) return result;

	/*
	* Check for WM_MOUSEACTIVATE when an MDI shell is active
	* and stop the normal shell activation but allow the mouse
	* down to be delivered.
	*/
	int hittest = (short) OS.LOWORD (lParam);
	switch (hittest) {
		case OS.HTERROR:
		case OS.HTTRANSPARENT:
		case OS.HTNOWHERE:
			break;
		default: {
			Control control = display._getFocusControl ();
			if (control != null) {
				Decorations decorations = control.menuShell ();
				if (decorations.getShell () == this && decorations != this) {
					display.ignoreRestoreFocus = true;
					display.lastHittest = hittest;
					display.lastHittestControl = null;
					if (hittest == OS.HTMENU || hittest == OS.HTSYSMENU) {
						display.lastHittestControl = control;
						return null;
					}
					return new LRESULT (OS.MA_NOACTIVATE);
				}
			}
		}
	}
	if (hittest == OS.HTMENU) return null;

	/*
	* Get the current location of the cursor,
	* not the location of the cursor when the
	* WM_MOUSEACTIVATE was generated.  This is
	* strictly incorrect but is necessary in
	* order to support Activate and Deactivate
	* events for embedded widgets that have
	* their own event loop.  In that case, the
	* cursor location reported by GetMessagePos()
	* is the one for our event loop, not the
	* embedded widget's event loop.
	*/
	POINT pt = new POINT ();
	if (!OS.GetCursorPos (pt)) {
		int pos = OS.GetMessagePos ();
		OS.POINTSTOPOINT (pt, pos);
	}
	long hwnd = OS.WindowFromPoint (pt);
	if (hwnd == 0) return null;
	Control control = display.findControl (hwnd);

	/*
	* When a shell is created with SWT.ON_TOP and SWT.NO_FOCUS,
	* do not activate the shell when the user clicks on the
	* the client area or on the border or a control within the
	* shell that does not take focus.
	*/
	if (control != null && (control.state & CANVAS) != 0) {
		if ((control.style & SWT.NO_FOCUS) != 0) {
			int bits = SWT.ON_TOP | SWT.NO_FOCUS;
			if ((style & bits) == bits) {
				if (hittest == OS.HTBORDER || hittest == OS.HTCLIENT) {
					return new LRESULT (OS.MA_NOACTIVATE);
				}
			}
		}
	}

	long code = callWindowProc (handle, OS.WM_MOUSEACTIVATE, wParam, lParam);
	setActiveControl (control, SWT.MouseDown);
	return new LRESULT (code);
}

@Override
LRESULT WM_MOVE (long wParam, long lParam) {
	LRESULT result = super.WM_MOVE (wParam, lParam);
	if (result != null) return result;
	ToolTip tip = getCurrentToolTip ();
	if (tip != null) tip.setVisible (false);
	return result;
}

@Override
LRESULT WM_NCHITTEST (long wParam, long lParam) {
	if (!OS.IsWindowEnabled (handle)) return null;
	if (!isEnabled () || !isActive ()) {
		if (!Display.TrimEnabled) return new LRESULT (OS.HTNOWHERE);
		long hittest = callWindowProc (handle, OS.WM_NCHITTEST, wParam, lParam);
		if (hittest == OS.HTCLIENT || hittest == OS.HTMENU) hittest = OS.HTBORDER;
		return new LRESULT (hittest);
	}
	if (menuBar != null && !menuBar.getEnabled ()) {
		long hittest = callWindowProc (handle, OS.WM_NCHITTEST, wParam, lParam);
		if (hittest == OS.HTMENU) hittest = OS.HTBORDER;
		return new LRESULT (hittest);
	}
	/*
	 * In quarter zoom levels, sometimes the MenuItem in the MenuBar has more height
	 * than the MenuBar, which leads to a gap between the client area and the menu
	 * bar leaving it unpainted and unmanaged. On hovering over the MenuItem, it
	 * leaves the gap area painted with remains of the MenuItem hover overlay. The
	 * event WM_NCHITTEST is sent on hovering over MenuItem and hence the overlay
	 * remains can be cleaned by calling
	 * fillUnpaintedRegionBetweenMenuBarAndClientArea on this event.
	 */
	fillUnpaintedRegionInShellWindow();
	return null;
}

@Override
LRESULT WM_NCLBUTTONDOWN (long wParam, long lParam) {
	LRESULT result = super.WM_NCLBUTTONDOWN (wParam, lParam);
	if (result != null) return result;
	/*
	* When the normal activation was interrupted in WM_MOUSEACTIVATE
	* because the active shell was an MDI shell, set the active window
	* to the top level shell but lock the active window and stop focus
	* changes.  This allows the user to interact the top level shell
	* in the normal manner.
	*/
	if (!display.ignoreRestoreFocus) return result;
	Display display = this.display;
	display.lockActiveWindow = true;
	long code = callWindowProc (handle, OS.WM_NCLBUTTONDOWN, wParam, lParam);
	display.lockActiveWindow = false;
	Control focusControl = display.lastHittestControl;
	if (focusControl != null && !focusControl.isDisposed ()) {
		focusControl.setFocus ();
	}
	display.lastHittestControl = null;
	display.ignoreRestoreFocus = false;
	return new LRESULT (code);
}

@Override
LRESULT WM_SETCURSOR (long wParam, long lParam) {
	/*
	* Feature in Windows.  When the shell is disabled
	* by a Windows standard dialog (like a MessageBox
	* or FileDialog), clicking in the shell does not
	* bring the shell or the dialog to the front. The
	* fix is to detect this case and bring the shell
	* forward.
	*/
	int msg = OS.HIWORD (lParam);
	if (msg == OS.WM_LBUTTONDOWN) {
		if (!Display.TrimEnabled) {
			Shell modalShell = display.getModalShell ();
			if (modalShell != null && !isActive ()) {
				long hwndModal = modalShell.handle;
				if (OS.IsWindowEnabled (hwndModal)) {
					OS.SetActiveWindow (hwndModal);
				}
			}
		}
		if (!OS.IsWindowEnabled (handle)) {
			long hwndPopup = OS.GetLastActivePopup (handle);
			if (hwndPopup != 0 && hwndPopup != handle) {
				if (display.getControl (hwndPopup) == null) {
					if (OS.IsWindowEnabled (hwndPopup)) {
						OS.SetActiveWindow (hwndPopup);
					}
				}
			}
		}
	}
	/*
	* When the shell that contains a cursor is disabled,
	* WM_SETCURSOR is called with HTERROR.  Normally,
	* when a control is disabled, the parent will get
	* mouse and cursor events.  In the case of a disabled
	* shell, there is no enabled parent.  In order to
	* show the cursor when a shell is disabled, it is
	* necessary to override WM_SETCURSOR when called
	* with HTERROR to set the cursor but only when the
	* mouse is in the client area of the shell.
	*/
	int hitTest = (short) OS.LOWORD (lParam);
	if (hitTest == OS.HTERROR) {
		if (!getEnabled ()) {
			Control control = display.getControl (wParam);
			if (control == this && cursor != null) {
				POINT pt = new POINT ();
				int pos = OS.GetMessagePos ();
				OS.POINTSTOPOINT (pt, pos);
				OS.ScreenToClient (handle, pt);
				RECT rect = new RECT ();
				OS.GetClientRect (handle, rect);
				if (OS.PtInRect (rect, pt)) {
					OS.SetCursor (Cursor.win32_getHandle(cursor, DPIUtil.getZoomForAutoscaleProperty(getShellZoom())));
					switch (msg) {
						case OS.WM_LBUTTONDOWN:
						case OS.WM_RBUTTONDOWN:
						case OS.WM_MBUTTONDOWN:
						case OS.WM_XBUTTONDOWN:
							OS.MessageBeep (OS.MB_OK);
					}
					return LRESULT.ONE;
				}
			}
		}
	}
	return super.WM_SETCURSOR (wParam, lParam);
}

@Override
LRESULT WM_SHOWWINDOW (long wParam, long lParam) {
	LRESULT result = super.WM_SHOWWINDOW (wParam, lParam);
	if (result != null) return result;
	/*
	* Bug in Windows.  If the shell is hidden while the parent
	* is iconic,  Windows shows the shell when the parent is
	* deiconified.  This does not happen if the shell is hidden
	* while the parent is not an icon.  The fix is to track
	* visible state for the shell and refuse to show the shell
	* when the parent is shown.
	*/
	if (lParam == OS.SW_PARENTOPENING) {
		Control control = this;
		while (control != null) {
			Shell shell = control.getShell ();
			if (!shell.showWithParent) return LRESULT.ZERO;
			control = control.parent;
		}
	}
	return result;
}

@Override
LRESULT WM_WINDOWPOSCHANGING (long wParam, long lParam) {
	LRESULT result = super.WM_WINDOWPOSCHANGING (wParam,lParam);
	if (result != null) return result;
	WINDOWPOS lpwp = new WINDOWPOS ();
	OS.MoveMemory (lpwp, lParam, WINDOWPOS.sizeof);
	if ((lpwp.flags & OS.SWP_NOSIZE) == 0) {
		lpwp.cx = Math.max (lpwp.cx, minWidth);
		int trim = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX;
		if ((style & SWT.NO_TRIM) == 0 && (style & trim) != 0) {
			lpwp.cx = Math.max (lpwp.cx, getSystemMetrics (OS.SM_CXMINTRACK));
		}
		lpwp.cy = Math.max (lpwp.cy, minHeight);
		if ((style & SWT.NO_TRIM) == 0 && (style & trim) != 0) {
			if ((style & SWT.RESIZE) != 0) {
				lpwp.cy = Math.max (lpwp.cy, getSystemMetrics (OS.SM_CYMINTRACK));
			} else {
				RECT rect = new RECT ();
				int bits1 = OS.GetWindowLong (handle, OS.GWL_STYLE);
				int bits2 = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
				adjustWindowRectEx(rect, bits1, false, bits2);
				lpwp.cy = Math.max (lpwp.cy, rect.bottom - rect.top);
			}
		}
		OS.MoveMemory (lParam, lpwp, WINDOWPOS.sizeof);
	}
	return result;
}

@Override
int computeBoundsZoom() {
	return getAutoscalingZoom();
}

@Override
int computeGetBoundsZoom() {
	return getAutoscalingZoom();
}

}
