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package org.eclipse.swt.widgets;
/*
* Copyright (c) 2000, 2002 IBM Corp. All rights reserved.
* This file is 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
*/
import org.eclipse.swt.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.gtk.*;
import org.eclipse.swt.graphics.*;
/**
* Instances of this class allow the user to select a font
* from all available fonts in the system.
* <p>
* IMPORTANT: This class is intended to be subclassed <em>only</em>
* within the SWT implementation.
* </p>
*/
public class FontDialog extends Dialog {
FontData fontData;
/**
* Constructs a new instance of this class given only its
* parent.
* <p>
* Note: Currently, null can be passed in for the parent.
* This has the effect of creating the dialog on the currently active
* display if there is one. If there is no current display, the
* dialog 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_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
* for all SWT dialog classes should include a comment which
* describes the style constants which are applicable to the class.
* </p>
* Note: Currently, null can be passed in for the parent.
* This has the effect of creating the dialog on the currently active
* display if there is one. If there is no current display, the
* dialog 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_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 ();
}
int cancelFunc (int widget, int callData) {
OS.gtk_widget_destroy (callData);
return 0;
}
int destroyFunc (int widget, int colorInfo) {
OS.gtk_main_quit ();
return 0;
}
/**
* 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
*/
public FontData getFontData() {
return fontData;
}
int okFunc (int widget, int callData) {
int hFontName = OS.gtk_font_selection_dialog_get_font_name (callData);
int fontSize = OS.strlen (hFontName);
byte [] buffer = new byte [fontSize];
OS.memmove (buffer, hFontName, fontSize);
char [] fontName = Converter.mbcsToWcs (null, buffer);
fontData = FontData.gtk_new(new String (fontName));
OS.gtk_widget_destroy (callData);
return 0;
}
/**
* 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 () {
int handle;
byte [] titleBytes;
titleBytes = Converter.wcsToMbcs (null, title, true);
handle = OS.gtk_font_selection_dialog_new (titleBytes);
GtkFontSelectionDialog dialog = new GtkFontSelectionDialog ();
OS.memmove (dialog, handle, GtkFontSelectionDialog.sizeof);
if (parent!=null) {
OS.gtk_window_set_modal(handle, true);
OS.gtk_window_set_transient_for(handle, parent.topHandle);
}
if (fontData != null) {
byte[] buffer = Converter.wcsToMbcs(null, fontData.gtk_getXlfd(), true);
OS.gtk_font_selection_set_font_name(dialog.fontsel, buffer);
}
Callback destroyCallback = new Callback (this, "destroyFunc", 2);
int destroyFunc = destroyCallback.getAddress ();
byte [] destroy = Converter.wcsToMbcs (null, "destroy", true);
OS.gtk_signal_connect (handle, destroy, destroyFunc, handle);
byte [] clicked = Converter.wcsToMbcs (null, "clicked", true);
Callback okCallback = new Callback (this, "okFunc", 2);
int okFunc = okCallback.getAddress ();
Callback cancelCallback = new Callback (this, "cancelFunc", 2);
int cancelFunc = cancelCallback.getAddress ();
OS.gtk_signal_connect (dialog.ok_button, clicked, okFunc, handle);
OS.gtk_signal_connect (dialog.cancel_button, clicked, cancelFunc, handle);
fontData = null;
OS.gtk_widget_show_now (handle);
OS.gtk_main ();
destroyCallback.dispose ();
okCallback.dispose ();
cancelCallback.dispose ();
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
*/
public void setFontData (FontData fontData) {
this.fontData = fontData;
}
}
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