/******************************************************************************* * 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.win32.*;import org.eclipse.swt.*;import org.eclipse.swt.graphics.*;import org.eclipse.swt.internal.Compatibility;/** * Instances of this class allow the user to select a font * from all available fonts in the system. * <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 FontDialog extends Dialog {	FontData fontData;	RGB rgb;	/** * Constructs a new instance of this class given only its parent. * * @param parent a shell 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> */public FontDialog (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 shell which will be the parent of the new instance * @param style the style of dialog 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> */public FontDialog (Shell parent, int style) {	super (parent, style);	checkSubclass ();}/** * Returns a FontData object describing the font that was * selected in the dialog, or null if none is available. *  * @return the FontData for the selected font, or null * @deprecated use #getFontList () */public FontData getFontData () {	return fontData;}/** * Returns a FontData set describing the font that was * selected in the dialog, or null if none is available. *  * @return the FontData for the selected font, or null * @since 2.1.1 */public FontData [] getFontList () {	if (fontData == null) return null;	FontData [] result = new FontData [1];	result [0] = fontData;	return result;}/** * Returns the currently selected color in the receiver. * * @return the RGB value for the selected color, may be null * * @see PaletteData#getRGBs *  * @since 2.1 */public RGB getRGB () {	return rgb;}/** * Makes the dialog visible and brings it to the front * of the display. * * @return a FontData object describing the font that was selected, *         or null if the dialog was cancelled or an error occurred * * @exception SWTException <ul> *    <li>ERROR_WIDGET_DISPOSED - if the dialog has been disposed</li> *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the dialog</li> * </ul> */public FontData open () {	if (OS.IsWinCE) SWT.error (SWT.ERROR_NOT_IMPLEMENTED);		/* Get the owner HWND for the dialog */	int hwndOwner = 0;	if (parent != null) hwndOwner = parent.handle;	/* Open the dialog */	int hHeap = OS.GetProcessHeap ();	CHOOSEFONT lpcf = new CHOOSEFONT ();	lpcf.lStructSize = CHOOSEFONT.sizeof;	lpcf.hwndOwner = hwndOwner;	lpcf.Flags = OS.CF_SCREENFONTS | OS.CF_EFFECTS;	int lpLogFont = OS.HeapAlloc (hHeap, OS.HEAP_ZERO_MEMORY, LOGFONT.sizeof);	if (fontData != null && fontData.data != null) {		LOGFONT logFont = fontData.data;		int lfHeight = logFont.lfHeight;		int hDC = OS.GetDC (0);		int pixels = -Compatibility.round (fontData.height * OS.GetDeviceCaps(hDC, OS.LOGPIXELSY), 72);		OS.ReleaseDC (0, hDC);		logFont.lfHeight = pixels;		lpcf.Flags |= OS.CF_INITTOLOGFONTSTRUCT;		OS.MoveMemory (lpLogFont, logFont, LOGFONT.sizeof);		logFont.lfHeight = lfHeight;	}	lpcf.lpLogFont = lpLogFont;	if (rgb != null) {		int red = rgb.red & 0xFF;		int green = (rgb.green << 8) & 0xFF00;		int blue = (rgb.blue << 16) & 0xFF0000;		lpcf.rgbColors = red | green | blue;	}		/* Make the parent shell be temporary modal */	Shell oldModal = null;	Display display = null;	if ((style & (SWT.APPLICATION_MODAL | SWT.SYSTEM_MODAL)) != 0) {		display = parent.getDisplay ();		oldModal = display.getModalDialogShell ();		display.setModalDialogShell (parent);	}	/* Open the dialog */	boolean success = OS.ChooseFont (lpcf);		/* Clear the temporary dialog modal parent */	if ((style & (SWT.APPLICATION_MODAL | SWT.SYSTEM_MODAL)) != 0) {		display.setModalDialogShell (oldModal);	}		/* Compute the result */	if (success) {		LOGFONT logFont = OS.IsUnicode ? (LOGFONT) new LOGFONTW () : new LOGFONTA ();		OS.MoveMemory (logFont, lpLogFont, LOGFONT.sizeof);		/*		 * This will not work on multiple screens or		 * for printing. Should use DC for the proper device.		 */		int hDC = OS.GetDC(0);		int logPixelsY = OS.GetDeviceCaps(hDC, OS.LOGPIXELSY);		int pixels = 0; 		if (logFont.lfHeight > 0) {			/*			 * Feature in Windows. If the lfHeight of the LOGFONT structure			 * is positive, the lfHeight measures the height of the entire			 * cell, including internal leading, in logical units. Since the			 * height of a font in points does not include the internal leading,			 * we must subtract the internal leading, which requires a TEXTMETRIC,			 * which in turn requires font creation.			 */			int hFont = OS.CreateFontIndirect(logFont);			int oldFont = OS.SelectObject(hDC, hFont);			TEXTMETRIC lptm = OS.IsUnicode ? (TEXTMETRIC) new TEXTMETRICW () : new TEXTMETRICA ();			OS.GetTextMetrics(hDC, lptm);			OS.SelectObject(hDC, oldFont);			OS.DeleteObject(hFont);			pixels = logFont.lfHeight - lptm.tmInternalLeading;		} else {			pixels = -logFont.lfHeight;		}		OS.ReleaseDC(0, hDC);		int points = Compatibility.round(pixels * 72, logPixelsY);		fontData = FontData.win32_new (logFont, points);		int red = lpcf.rgbColors & 0xFF;		int green = (lpcf.rgbColors >> 8) & 0xFF;		int blue = (lpcf.rgbColors >> 16) & 0xFF;		rgb = new RGB (red, green, blue);	}			/* Free the OS memory */	if (lpLogFont != 0) OS.HeapFree (hHeap, 0, lpLogFont);	/*	* 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 fontData;}/** * Sets a FontData object describing the font to be * selected by default in the dialog, or null to let * the platform choose one. *  * @param fontData the FontData to use initially, or null * @deprecated use #setFontList (FontData []) */public void setFontData (FontData fontData) {	this.fontData = fontData;}/** * Sets a set of FontData objects describing the font to * be selected by default in the dialog, or null to let * the platform choose one. *  * @param fontData the set of FontData objects to use initially, or null * @since 2.1.1 */public void setFontList (FontData [] fontData) {	if (fontData != null && fontData.length > 0) {		this.fontData = fontData [0];	} else {		this.fontData = null;	}}/** * 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 to select a default when *        open() is called * * @see PaletteData#getRGBs *  * @since 2.1 */public void setRGB (RGB rgb) {	this.rgb = rgb;}}