/*******************************************************************************
* Copyright (c) 2006, 2007 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.examples.graphics;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Device;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Menu;
/**
* This tab demonstrates antialiasing for text. Antialiasing is used for smoothing jagged edges in graphics. This tab
* allows the user to see the effects of different antialiasing values.
*/
public class TextAntialiasTab extends GraphicsTab {
static int[] aliasValues = { SWT.OFF, SWT.DEFAULT, SWT.ON };
/**
* Returns the name of a valid font for the host platform.
*
* @param index
* index is used to determine the appropriate font face
*/
static String getPlatformFontFace(int index) {
if (SWT.getPlatform() == "win32" || SWT.getPlatform() == "wpf")
return new String[] { "Bookman Old Style", "Century Gothic", "Comic Sans MS", "Impact", "Garamond",
"Lucida Console", "Monotype Corsiva" }[index];
else if (SWT.getPlatform() == "motif")
return new String[] { "urw palladio l", "Courier", "qub", "URW Gothic L", "Times", "Lucida",
"URW ChanceryL" }[index];
else if (SWT.getPlatform() == "gtk")
return new String[] { "Luxi Mono", "KacstTitleL", "Baekmuk Batang", "Baekmuk Headline", "KacstFarsi",
"Baekmuk Gulim", "URW Chancery L" }[index];
else if (SWT.getPlatform() == "carbon")
return new String[] { "Apple Chancery", "Brush Script MT", "Comic Sans MS", "Impact", "Herculanum",
"Lucida Grande", "Papyrus" }[index];
else
return new String[] { "Courier", "Verdana", "Verdana", "Verdana", "Verdana", "Verdana", "Verdana" }[index];
}
Combo aliasCombo;
Button colorButton;
Menu menu;
String text = GraphicsExample.getResourceString("SWT");
GraphicsBackground textColor;
public TextAntialiasTab(GraphicsExample example) {
super(example);
}
public void createControlPanel(Composite parent) {
Composite comp;
// create drop down combo for antialiasing
comp = new Composite(parent, SWT.NONE);
comp.setLayout(new GridLayout(2, false));
new Label(comp, SWT.CENTER).setText(GraphicsExample.getResourceString("Antialiasing")); //$NON-NLS-1$
aliasCombo = new Combo(comp, SWT.DROP_DOWN);
aliasCombo.add("OFF");
aliasCombo.add("DEFAULT");
aliasCombo.add("ON");
aliasCombo.select(0);
aliasCombo.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
example.redraw();
}
});
ColorMenu cm = new ColorMenu();
cm.setColorItems(true);
menu = cm.createMenu(parent.getParent(), new ColorListener() {
public void setColor(GraphicsBackground gb) {
textColor = gb;
colorButton.setImage(gb.getThumbNail());
example.redraw();
}
});
// create color button
comp = new Composite(parent, SWT.NONE);
comp.setLayout(new GridLayout());
// initialize the color to black
textColor = (GraphicsBackground) menu.getItem(1).getData();
colorButton = new Button(comp, SWT.PUSH);
colorButton.setText(GraphicsExample.getResourceString("Color")); //$NON-NLS-1$
colorButton.setImage(textColor.getThumbNail());
colorButton.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
final Button button = (Button) event.widget;
final Composite parent = button.getParent();
Rectangle bounds = button.getBounds();
Point point = parent.toDisplay(new Point(bounds.x, bounds.y));
menu.setLocation(point.x, point.y + bounds.height);
menu.setVisible(true);
}
});
}
public void dispose() {
if (menu != null) {
menu.dispose();
menu = null;
}
}
public String getCategory() {
return GraphicsExample.getResourceString("Antialiasing"); //$NON-NLS-1$
}
public String getDescription() {
return GraphicsExample.getResourceString("AntialiasingTextDesc"); //$NON-NLS-1$
}
public String getText() {
return GraphicsExample.getResourceString("Text"); //$NON-NLS-1$
}
/*
* (non-Javadoc)
*
* @see org.eclipse.swt.examples.graphics.GraphicsTab#paint(org.eclipse.swt.graphics.GC, int, int)
*/
public void paint(GC gc, int width, int height) {
if (!example.checkAdvancedGraphics())
return;
Device device = gc.getDevice();
if (textColor != null && textColor.getBgColor1() != null)
gc.setForeground(textColor.getBgColor1());
gc.setTextAntialias(TextAntialiasTab.aliasValues[aliasCombo.getSelectionIndex()]);
// column 1, row 1
Font font = new Font(device, TextAntialiasTab.getPlatformFontFace(0), 100, SWT.NORMAL);
gc.setFont(font);
Point size = gc.stringExtent(text);
gc.drawString(text, width / 4 - size.x / 2, height / 4 - size.y / 2, true);
font.dispose();
// column 1, row 2
font = new Font(device, TextAntialiasTab.getPlatformFontFace(1), 100, SWT.NORMAL);
gc.setFont(font);
size = gc.stringExtent(text);
gc.drawString(text, width / 4 - size.x / 2, 3 * height / 4 - size.y / 2, true);
font.dispose();
// column 2, row 1
font = new Font(device, TextAntialiasTab.getPlatformFontFace(2), 50, SWT.NORMAL);
gc.setFont(font);
size = gc.stringExtent(text);
gc.drawString(text, (width - size.x) / 2, 0, true);
font.dispose();
// column 2, row 2
font = new Font(device, TextAntialiasTab.getPlatformFontFace(3), 100, SWT.ITALIC);
gc.setFont(font);
size = gc.stringExtent(text);
gc.drawString(text, (width - size.x) / 2, (height - size.y) / 2, true);
font.dispose();
// column 2, row 3
font = new Font(device, TextAntialiasTab.getPlatformFontFace(4), 50, SWT.NORMAL);
gc.setFont(font);
size = gc.stringExtent(text);
gc.drawString(text, (width - size.x) / 2, height - size.y, true);
font.dispose();
// column 3, row 1
font = new Font(device, TextAntialiasTab.getPlatformFontFace(5), 100, SWT.NORMAL);
gc.setFont(font);
size = gc.stringExtent(text);
gc.drawString(text, 3 * width / 4 - size.x / 2, height / 4 - size.y / 2, true);
font.dispose();
// column 3, row 2
font = new Font(device, TextAntialiasTab.getPlatformFontFace(6), 100, SWT.NORMAL);
gc.setFont(font);
size = gc.stringExtent(text);
gc.drawString(text, 3 * width / 4 - size.x / 2, 3 * height / 4 - size.y / 2, true);
font.dispose();
}
}