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/*******************************************************************************
 * Copyright (c) 2000, 2019 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.graphics.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.gtk.*;
import org.eclipse.swt.internal.gtk3.*;
import org.eclipse.swt.internal.gtk4.*;

/**
 * Instances of this class allow the user to select a font
 * from all available fonts in the system.
 * 
*
Styles:
*
(none)
*
Events:
*
(none)
*
*

* IMPORTANT: This class is not intended to be subclassed. *

* * @see SWT Example: ControlExample, Dialog tab * @see Sample code and further information * @noextend This class is not intended to be subclassed by clients. */ 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
    *
  • ERROR_NULL_ARGUMENT - if the parent is null
  • *
* @exception SWTException
    *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
  • *
  • ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
  • *
*/ public FontDialog (Shell parent) { this (parent, SWT.APPLICATION_MODAL); } /** * Constructs a new instance of this class given its parent * and a style value describing its behavior and appearance. *

* The style value is either one of the style constants defined in * class SWT which is applicable to instances of this * class, or must be built by bitwise OR'ing together * (that is, using the int "|" operator) two or more * of those SWT style constants. The class description * lists the style constants that are applicable to the class. * Style bits are also inherited from superclasses. *

* * @param parent a shell which will be the parent of the new instance * @param style the style of dialog to construct * * @exception IllegalArgumentException
    *
  • ERROR_NULL_ARGUMENT - if the parent is null
  • *
* @exception SWTException
    *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
  • *
  • ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
  • *
*/ public FontDialog (Shell parent, int style) { super (parent, checkStyle (parent, style)); checkSubclass (); } /** * Returns true if the dialog's effects selection controls * are visible, and false otherwise. *

* If the platform's font dialog does not have any effects selection controls, * then this method always returns false. *

* * @return true if the dialog's effects selection controls * are visible and false otherwise * * @since 3.8 */ public boolean getEffectsVisible () { // The GTK FontDialog does not have any effects selection controls. return false; } /** * 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 () */ @Deprecated 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 an RGB describing the color that was selected * in the dialog, or null if none is available. * * @return the RGB value for the selected color, or 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
    *
  • ERROR_WIDGET_DISPOSED - if the dialog has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the dialog
  • *
*/ public FontData open () { byte[] titleBytes = Converter.javaStringToCString(title); Display display = parent != null ? parent.getDisplay(): Display.getCurrent(); long handle = GTK.gtk_font_chooser_dialog_new (titleBytes, 0); if (parent != null) { long shellHandle = parent.topHandle(); GTK.gtk_window_set_transient_for(handle, shellHandle); } long defaultWindowGroup = GTK.gtk_window_get_group(0); GTK.gtk_window_group_add_window(defaultWindowGroup, handle); GTK.gtk_window_set_modal(handle, true); display.addIdleProc(); Dialog oldModal = display.getModalDialog(); display.setModalDialog(this); // Set font chooser dialog to current font if (fontData != null) { Font font = new Font(display, fontData); long fontName = OS.pango_font_description_to_string(font.handle); int length = C.strlen(fontName); byte[] buffer = new byte[length + 1]; C.memmove(buffer, fontName, length); font.dispose(); OS.g_free(fontName); GTK.gtk_font_chooser_set_font(handle, buffer); } int signalId = 0; long hookId = 0; if ((style & SWT.RIGHT_TO_LEFT) != 0) { signalId = OS.g_signal_lookup(OS.map, GTK.GTK_TYPE_WIDGET()); hookId = OS.g_signal_add_emission_hook(signalId, 0, display.emissionProc, handle, 0); } int response; if (GTK.GTK4) { response = SyncDialogUtil.run(display, handle, false); } else { display.externalEventLoop = true; display.sendPreExternalEventDispatchEvent(); response = GTK3.gtk_dialog_run(handle); display.externalEventLoop = false; display.sendPostExternalEventDispatchEvent(); } if ((style & SWT.RIGHT_TO_LEFT) != 0) { OS.g_signal_remove_emission_hook(signalId, hookId); } display.setModalDialog(oldModal); boolean success = response == GTK.GTK_RESPONSE_OK; if (success) { long fontName = GTK.gtk_font_chooser_get_font (handle); int length = C.strlen (fontName); byte [] buffer = new byte [length + 1]; C.memmove (buffer, fontName, length); OS.g_free (fontName); long fontDesc = OS.pango_font_description_from_string (buffer); Font font = Font.gtk_new (display, fontDesc); fontData = font.getFontData () [0]; OS.pango_font_description_free (fontDesc); } else { fontData = null; } display.removeIdleProc (); if (GTK.GTK4) { GTK4.gtk_window_destroy(handle); } else { GTK3.gtk_widget_destroy(handle); } return fontData; } /** * Sets the effects selection controls in the dialog visible if the * argument is true, and invisible otherwise. *

* By default the effects selection controls are displayed if the * platform font dialog supports effects selection. *

* * @param visible whether or not the dialog will show the effects selection controls * * @since 3.8 */ public void setEffectsVisible(boolean visible) { // The GTK FontDialog does not have any effects selection controls. } /** * 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 []) */ @Deprecated public void setFontData (FontData fontData) { this.fontData = fontData; } /** * Sets the 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 * to let the platform select a default when open() is called * * @see Font#getFontData * * @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 RGB describing the color to be selected by default * in the dialog, or null to let the platform choose one. * * @param rgb the RGB value to use initially, or null to let * the platform select a default when open() is called * * @see PaletteData#getRGBs * * @since 2.1 */ public void setRGB (RGB rgb) { this.rgb = rgb; } }




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