/*******************************************************************************
* Copyright (c) 2006 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.Pattern;
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.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Menu;
/**
* This tab demonstrates various line caps applicable to a line.
*/
public class LineCapTab extends GraphicsTab {
/**
* Returns the name of a valid font for the resident platform.
*/
static String getPlatformFont() {
if (SWT.getPlatform() == "win32")
return "Arial";
else if (SWT.getPlatform() == "motif")
return "Helvetica";
else if (SWT.getPlatform() == "gtk")
return "Baekmuk Batang";
else if (SWT.getPlatform() == "carbon")
return "Arial";
else
return "Verdana";
}
Button colorButton;
GraphicsBackground foreground;
Menu menu;
public LineCapTab(GraphicsExample example) {
super(example);
}
public void createControlPanel(Composite parent) {
Composite comp;
// create color button
comp = new Composite(parent, SWT.NONE);
comp.setLayout(new GridLayout());
ColorMenu cm = new ColorMenu();
cm.setPatternItems(example.checkAdvancedGraphics());
menu = cm.createMenu(parent.getParent(), new ColorListener() {
public void setColor(GraphicsBackground gb) {
foreground = gb;
colorButton.setImage(gb.getThumbNail());
example.redraw();
}
});
// initialize the foreground to the 3rd item in the menu (red)
foreground = (GraphicsBackground) menu.getItem(2).getData();
// color button
colorButton = new Button(comp, SWT.PUSH);
colorButton.setText(GraphicsExample.getResourceString("Color")); //$NON-NLS-1$
colorButton.setImage(foreground.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("Lines"); //$NON-NLS-1$
}
public String getDescription() {
return GraphicsExample.getResourceString("LineCapDescription"); //$NON-NLS-1$
}
public String getText() {
return GraphicsExample.getResourceString("LineCap"); //$NON-NLS-1$
}
public void paint(GC gc, int width, int height) {
Device device = gc.getDevice();
// draw side lines
gc.setLineWidth(1);
gc.setLineStyle(SWT.LINE_DOT);
gc.setForeground(device.getSystemColor(SWT.COLOR_BLACK));
gc.drawLine(3 * width / 16, height / 6, 3 * width / 16, 5 * height / 6);
gc.drawLine(13 * width / 16, height / 6, 13 * width / 16, 5 * height / 6);
gc.setLineStyle(SWT.LINE_SOLID);
// draw labels
Font font = new Font(device, LineCapTab.getPlatformFont(), 20, SWT.NORMAL);
gc.setFont(font);
String text = GraphicsExample.getResourceString("Flat"); //$NON-NLS-1$
Point size = gc.stringExtent(text);
gc.drawString(text, (width - size.x) / 2, 3 * height / 12, true);
text = GraphicsExample.getResourceString("Square"); //$NON-NLS-1$
size = gc.stringExtent(text);
gc.drawString(text, (width - size.x) / 2, 5 * height / 12, true);
text = GraphicsExample.getResourceString("Round"); //$NON-NLS-1$
size = gc.stringExtent(text);
gc.drawString(text, (width - size.x) / 2, 7 * height / 12, true);
font.dispose();
Pattern pattern = null;
if (foreground.getBgColor1() != null)
gc.setForeground(foreground.getBgColor1());
else if (foreground.getBgImage() != null) {
pattern = new Pattern(device, foreground.getBgImage());
gc.setForegroundPattern(pattern);
}
// draw lines with caps
gc.setLineWidth(20);
gc.setLineCap(SWT.CAP_FLAT);
gc.drawLine(3 * width / 16, 2 * height / 6, 13 * width / 16, 2 * height / 6);
gc.setLineCap(SWT.CAP_SQUARE);
gc.drawLine(3 * width / 16, 3 * height / 6, 13 * width / 16, 3 * height / 6);
gc.setLineCap(SWT.CAP_ROUND);
gc.drawLine(3 * width / 16, 4 * height / 6, 13 * width / 16, 4 * height / 6);
if (pattern != null)
pattern.dispose();
}
}