/******************************************************************************* * Copyright (c) 2000, 2004 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Common Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/cpl-v10.html *  * Contributors: *     IBM Corporation - initial API and implementation *******************************************************************************/package org.eclipse.swt.widgets;import org.eclipse.swt.internal.*;import org.eclipse.swt.internal.win32.*;import org.eclipse.swt.*;import org.eclipse.swt.graphics.*;/** * Instances of this class allow the user to select a color * from a predefined set of available colors. * <dl> * <dt><b>Styles:</b></dt> * <dd>(none)</dd> * <dt><b>Events:</b></dt> * <dd>(none)</dd> * </dl> * <p> * IMPORTANT: This class is intended to be subclassed <em>only</em> * within the SWT implementation. * </p> */public class ColorDialog extends Dialog {	RGB rgb;	/** * Constructs a new instance of this class given only its parent. * * @param parent a composite control which will be the parent of the new instance * * @exception IllegalArgumentException <ul> *    <li>ERROR_NULL_ARGUMENT - if the parent is null</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 * @see Widget#checkSubclass * @see Widget#getStyle */public ColorDialog (Shell parent) {	this (parent, SWT.PRIMARY_MODAL);}/** * 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> * * @param parent a composite control which will be the parent of the new instance (cannot be null) * @param style the style of control to construct * * @exception IllegalArgumentException <ul> *    <li>ERROR_NULL_ARGUMENT - if the parent is null</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 * @see Widget#checkSubclass * @see Widget#getStyle */public ColorDialog (Shell parent, int style) {	super (parent, style);	checkSubclass ();}int CCHookProc (int hdlg, int uiMsg, int lParam, int lpData) {	switch (uiMsg) {		case OS.WM_INITDIALOG:			if (title != null && title.length () != 0) {				/* Use the character encoding for the default locale */				TCHAR buffer = new TCHAR (0, title, true);				OS.SetWindowText (hdlg, buffer);			}			break;	}	return 0;}/** * Returns the currently selected color in the receiver. * * @return the RGB value for the selected color, may be null * * @see PaletteData#getRGBs */public RGB getRGB () {	return rgb;}/** * Makes the receiver visible and brings it to the front * of the display. * * @return the selected color, or null if the dialog was *         cancelled, no color was selected, or an error *         occurred * * @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 RGB open () {		/* Get the owner HWND for the dialog */	int hwndOwner = parent.handle;	/* Create the CCHookProc */	Callback callback = new Callback (this, "CCHookProc", 4);	int lpfnHook = callback.getAddress ();		/* Allocate the Custom Colors */	Display display = parent.display;	if (display.lpCustColors == 0) {		int hHeap = OS.GetProcessHeap ();		display.lpCustColors = OS.HeapAlloc (hHeap, OS.HEAP_ZERO_MEMORY, 16 * 4);	}		/* Open the dialog */		CHOOSECOLOR lpcc = new CHOOSECOLOR ();	lpcc.lStructSize = CHOOSECOLOR.sizeof;	lpcc.Flags = OS.CC_ANYCOLOR | OS.CC_ENABLEHOOK;	lpcc.lpfnHook = lpfnHook;	lpcc.hwndOwner = hwndOwner;	lpcc.lpCustColors = display.lpCustColors;	if (rgb != null) {		lpcc.Flags |= OS.CC_RGBINIT;		int red = rgb.red & 0xFF;		int green = (rgb.green << 8) & 0xFF00;		int blue = (rgb.blue << 16) & 0xFF0000;		lpcc.rgbResult = red | green | blue;	}		/* Make the parent shell be temporary modal */	Shell oldModal = null;	if ((style & (SWT.APPLICATION_MODAL | SWT.SYSTEM_MODAL)) != 0) {		oldModal = display.getModalDialogShell ();		display.setModalDialogShell (parent);	}		/* Open the dialog */	boolean success = OS.ChooseColor (lpcc);		/* Clear the temporary dialog modal parent */	if ((style & (SWT.APPLICATION_MODAL | SWT.SYSTEM_MODAL)) != 0) {		display.setModalDialogShell (oldModal);	}		if (success) {		int red = lpcc.rgbResult & 0xFF;		int green = (lpcc.rgbResult >> 8) & 0xFF;		int blue = (lpcc.rgbResult >> 16) & 0xFF;		rgb = new RGB (red, green, blue);	}		/* Free the CCHookProc */	callback.dispose ();		/* Free the Custom Colors */	/*	* This code is intentionally commented.  Currently,	* there is exactly one set of custom colors per display.	* The memory associated with these colors is released	* when the display is disposed.	*///	if (lpCustColors != 0) OS.HeapFree (hHeap, 0, lpCustColors);		/*	* This code is intentionally commented.  On some	* platforms, the owner window is repainted right	* away when a dialog window exits.  This behavior	* is currently unspecified.	*///	if (hwndOwner != 0) OS.UpdateWindow (hwndOwner);		if (!success) return null;	return rgb;}/** * Sets the receiver's selected color to be the argument. * * @param rgb the new RGB value for the selected color, may be *        null to let the platform select a default when *        open() is called * @see PaletteData#getRGBs */public void setRGB (RGB rgb) {	this.rgb = rgb;}}