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/*******************************************************************************
* Copyright (c) 2006, 2016 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.examples.graphics;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Device;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Path;
import org.eclipse.swt.graphics.Pattern;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.ToolBar;
import org.eclipse.swt.widgets.ToolItem;
/**
* This tab draws an image consisting of gradients of two colors.
* */
public class GradientTab extends GraphicsTab {
ToolBar toolBar;
ToolItem colorItem1, colorItem2;
Menu menu1, menu2;
GraphicsBackground colorGB1, colorGB2;
public GradientTab(GraphicsExample example) {
super(example);
}
/**
* Dispose resources created by this tab.
* */
@Override
public void dispose() {
if (menu1 != null) {
menu1.dispose();
menu1 = null;
}
if (menu2 != null) {
menu2.dispose();
menu2 = null;
}
}
@Override
public String getCategory() {
return GraphicsExample.getResourceString("Gradient"); //$NON-NLS-1$
}
@Override
public String getText() {
return GraphicsExample.getResourceString("GradImage"); //$NON-NLS-1$
}
@Override
public String getDescription() {
return GraphicsExample.getResourceString("GradientImageDescription"); //$NON-NLS-1$
}
@Override
public void createControlPanel(final Composite parent) {
final Display display = parent.getDisplay();
toolBar = new ToolBar(parent, SWT.FLAT);
ColorMenu colorMenu = new ColorMenu();
// menu for colorItem1
menu1 = colorMenu.createMenu(parent.getParent(), gb -> {
colorGB1 = gb;
colorItem1.setImage(gb.getThumbNail());
example.redraw();
});
// initialize the background to the 5th item in the menu (blue)
colorGB1 = (GraphicsBackground)menu1.getItem(4).getData();
// toolbar item for color1
colorItem1 = new ToolItem(toolBar, SWT.PUSH);
colorItem1.setText(GraphicsExample.getResourceString("GradientTabItem1"));
colorItem1.setImage(colorGB1.getThumbNail());
colorItem1.addListener(SWT.Selection, event -> {
final ToolItem toolItem = (ToolItem) event.widget;
final ToolBar toolBar = toolItem.getParent();
Rectangle toolItemBounds = toolItem.getBounds();
Point point = toolBar.toDisplay(new Point(toolItemBounds.x, toolItemBounds.y));
menu1.setLocation(point.x, point.y + toolItemBounds.height);
menu1.setVisible(true);
});
// menu for colorItem2
menu2 = colorMenu.createMenu(parent.getParent(), gb -> {
colorGB2 = gb;
colorItem2.setImage(gb.getThumbNail());
example.redraw();
});
// initialize the background to the 3rd item in the menu (red)
colorGB2 = (GraphicsBackground)menu2.getItem(2).getData();
// toolbar item for color2
colorItem2 = new ToolItem(toolBar, SWT.PUSH);
colorItem2.setText(GraphicsExample.getResourceString("GradientTabItem2"));
colorItem2.setImage(colorGB2.getThumbNail());
colorItem2.addListener(SWT.Selection, event -> {
final ToolItem toolItem = (ToolItem) event.widget;
final ToolBar toolBar = toolItem.getParent();
Rectangle toolItemBounds = toolItem.getBounds();
Point point = toolBar.toDisplay(new Point(toolItemBounds.x, toolItemBounds.y));
menu2.setLocation(point.x, point.y + toolItemBounds.height);
menu2.setVisible(true);
});
// toolbar item for swapping colors
ToolItem swapItem = new ToolItem(toolBar, SWT.PUSH);
swapItem.setText(GraphicsExample.getResourceString("SwapColors")); //$NON-NLS-1$
swapItem.setImage(example.loadImage(display, "swap.gif"));
swapItem.addListener(SWT.Selection, event -> {
GraphicsBackground tmp = colorGB1;
colorGB1 = colorGB2;
colorGB2 = tmp;
colorItem1.setImage(colorGB1.getThumbNail());
colorItem2.setImage(colorGB2.getThumbNail());
example.redraw();
});
}
/**
* This method draws the gradient patterns that make up the image. The image
* consists of 4 rows, each consisting of 4 gradient patterns (total of 16).
*/
@Override
public void paint(GC gc, int width, int height) {
if (!example.checkAdvancedGraphics()) return;
Device device = gc.getDevice();
Image image = createImage(device, colorGB1.getBgColor1(), colorGB2.getBgColor1(), width, height);
Pattern p = new Pattern(device, image);
gc.setBackgroundPattern(p);
gc.fillRectangle(0, 0, width, height);
p.dispose();
image.dispose();
}
/**
* Creates and returns an image made up of gradient patterns. The image takes up
* a quarter of the area of the total drawing surface.
*
* @param device
* A Device
* @param color1
* A Color
* @param color2
* A Color
* @param width
* Width of the drawing surface
* @param height
* Height of the drawing surface
*/
Image createImage(Device device, Color color1, Color color2, int width, int height) {
Image image = new Image(device, width/2, height/2);
GC gc = new GC(image);
Rectangle rect = image.getBounds();
Pattern pattern1 = new Pattern(device, rect.x, rect.y, rect.width/2f, rect.height/2f, color1, color2);
gc.setBackgroundPattern(pattern1);
Path path = new Path(device);
path.addRectangle(0, 0, width/4f, height/4f);
path.addRectangle(width/4f, height/4f, width/4f, height/4f);
gc.fillPath(path);
path.dispose();
Pattern pattern2 = new Pattern(device, rect.width, 0, rect.width/2f, rect.height/2f, color1, color2);
gc.setBackgroundPattern(pattern2);
path = new Path(device);
path.addRectangle(width/4f, 0, width/4f, height/4f);
path.addRectangle(0, height/4f, width/4f, height/4f);
gc.fillPath(path);
path.dispose();
gc.dispose();
pattern1.dispose();
pattern2.dispose();
return image;
}
}
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