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/*******************************************************************************
* Copyright (c) 2000, 2003 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.opengl.examples;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.opengl.*;
import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
class ColorSelectionGroup implements Listener {
private Color color;
private Label label;
private Image image;
private Button button;
private List<IColorSelectionListener> listeners = new ArrayList<IColorSelectionListener>();
/**
* Constructor.
*
* @param parent the parent composite
* @param style style bits to be applied to the color group
*/
ColorSelectionGroup(Composite parent, int style) {
super();
initColor(parent.getDisplay());
Composite colorGroup = new Composite(parent, style);
GridLayout layout = new GridLayout(2, false);
layout.marginWidth = 0;
layout.marginHeight = 0;
colorGroup.setLayout(layout);
// GridData data = new GridData(GridData.FILL_HORIZONTAL);
// data.grabExcessHorizontalSpace = true;
// colorGroup.setLayoutData(data);
button = new Button(colorGroup, SWT.NONE);
button.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_END));
image = new Image(button.getDisplay(), 12, 12);
drawButtonImage();
button.setImage(image);
button.addListener(SWT.Selection, this);
button.addDisposeListener(new DisposeListener() {
public void widgetDisposed(DisposeEvent event) {
if (image != null) image.dispose();
if (color != null) color.dispose();
}
});
label = new Label(colorGroup, SWT.NONE);
label.setText("Color");
// data = new GridData(GridData.FILL_HORIZONTAL);
// data.grabExcessHorizontalSpace = true;
// label.setLayoutData(data);
}
/**
* Adds the argument to this group's collection of
* color selection listeners.
*
* @param listener
*/
void addColorSelectionListener(IColorSelectionListener listener) {
listeners.add(listener);
}
/**
* Draws the colored square on the selection button.
*/
void drawButtonImage() {
GC gc = new GC(image);
gc.setBackground(color);
Rectangle bounds = image.getBounds();
gc.fillRectangle(0, 0, bounds.width, bounds.height);
gc.drawRectangle(0, 0, bounds.width - 1, bounds.height - 1);
gc.dispose();
}
/**
* @see org.eclipse.swt.widgets.Listener#handleEvent(Event)
*/
public void handleEvent(Event e) {
Shell shell = button.getShell();
ColorDialog colorDialog = new ColorDialog(shell);
colorDialog.setRGB(
new RGB(color.getRed(), color.getGreen(), color.getBlue()));
RGB rgb = colorDialog.open();
if (rgb == null) return;
setRGB(rgb);
notifyListeners(rgb);
}
/**
* Initializes the color by querying for the current color.
*
* @param display
*/
void initColor(Display display) {
double[] currentColor = new double[4];
GL.glGetDoublev(GL.GL_CURRENT_COLOR, currentColor);
RGB rgb =
new RGB(
(int) currentColor[0] * 255,
(int) currentColor[1] * 255,
(int) currentColor[2] * 255);
color = new Color(display, rgb);
}
/**
* Notifies all registered color selection listeners.
*
* @param value
*/
void notifyListeners(RGB rgb) {
IColorSelectionListener[] listenersArr =
listeners.toArray(new IColorSelectionListener[listeners.size()]);
for (int i = 0; i < listenersArr.length; i++) {
listenersArr [i].handleColorSelection(rgb);
}
}
/**
* Removes the argument from this group's collection of color selection
* listeners. If the argument is not a registered listener then does
* nothing.
*
* @param listener
*/
void removeColorSelectionListener(IColorSelectionListener listener) {
listeners.remove(listener);
}
/**
* Sets the text for the group's label.
*
* @param text the new label text
*/
void setText(String text) {
label.setText(text);
}
/**
* Sets the current color.
*
* @param rgb the rgb of the new color
*/
void setRGB(RGB rgb) {
Color oldColor = color;
color = new Color(button.getDisplay(), rgb);
drawButtonImage();
button.setImage(image);
if (oldColor != null) oldColor.dispose();
}
}
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