| /******************************************************************************* |
| * Copyright (c) 2000, 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jface.preference; |
| |
| |
| import org.eclipse.jface.resource.JFaceResources; |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.events.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.widgets.*; |
| |
| /** |
| * The ColorSelector is a wrapper for a button that displays |
| * a selected Color and allows the user to change the selection. |
| */ |
| public class ColorSelector { |
| |
| private Point fExtent; |
| private Image fImage; |
| private RGB fColorValue; |
| private Color fColor; |
| private Button fButton; |
| |
| /** |
| * Create a new instance of the reciever and the |
| * button that it wrappers in the supplied parent Composite |
| * @param parent. The parent of the button. |
| */ |
| public ColorSelector(Composite parent) { |
| |
| fButton = new Button(parent, SWT.PUSH); |
| fExtent = computeImageSize(parent); |
| fImage = new Image(parent.getDisplay(), fExtent.x, fExtent.y); |
| |
| GC gc = new GC(fImage); |
| gc.setBackground(fButton.getBackground()); |
| gc.fillRectangle(0, 0, fExtent.x, fExtent.y); |
| gc.dispose(); |
| |
| fButton.setImage(fImage); |
| fButton.addSelectionListener(new SelectionAdapter() { |
| public void widgetSelected(SelectionEvent event) { |
| ColorDialog colorDialog = new ColorDialog(fButton.getShell()); |
| colorDialog.setRGB(fColorValue); |
| RGB newColor = colorDialog.open(); |
| if (newColor != null) { |
| fColorValue = newColor; |
| updateColorImage(); |
| } |
| } |
| }); |
| |
| fButton.addDisposeListener(new DisposeListener() { |
| public void widgetDisposed(DisposeEvent event) { |
| if (fImage != null) { |
| fImage.dispose(); |
| fImage = null; |
| } |
| if (fColor != null) { |
| fColor.dispose(); |
| fColor = null; |
| } |
| } |
| }); |
| } |
| |
| /** |
| * Return the currently displayed color. |
| * @return RGB |
| */ |
| public RGB getColorValue() { |
| return fColorValue; |
| } |
| |
| /** |
| * Set the current color value and update the control. |
| * @param rgb. The new color. |
| */ |
| public void setColorValue(RGB rgb) { |
| fColorValue = rgb; |
| updateColorImage(); |
| } |
| |
| /** |
| * Get the button control being wrappered by the selector. |
| * @return Button |
| */ |
| public Button getButton() { |
| return fButton; |
| } |
| |
| /** |
| * Update the image being displayed on the button using |
| * the current color setting, |
| */ |
| |
| protected void updateColorImage() { |
| |
| Display display = fButton.getDisplay(); |
| |
| GC gc = new GC(fImage); |
| gc.setForeground(display.getSystemColor(SWT.COLOR_BLACK)); |
| gc.drawRectangle(0, 2, fExtent.x - 1, fExtent.y - 4); |
| |
| if (fColor != null) |
| fColor.dispose(); |
| |
| fColor = new Color(display, fColorValue); |
| gc.setBackground(fColor); |
| gc.fillRectangle(1, 3, fExtent.x - 2, fExtent.y - 5); |
| gc.dispose(); |
| |
| fButton.setImage(fImage); |
| } |
| |
| /** |
| * Compute the size of the image to be displayed. |
| * @return Point |
| * @param window - the window used to calculate |
| */ |
| |
| private Point computeImageSize(Control window) { |
| GC gc = new GC(window); |
| Font f = |
| JFaceResources.getFontRegistry().get(JFaceResources.DEFAULT_FONT); |
| gc.setFont(f); |
| int height = gc.getFontMetrics().getHeight(); |
| gc.dispose(); |
| Point p = new Point(height * 3 - 6, height); |
| return p; |
| } |
| |
| /** |
| * Set whether or not the button is enabled. |
| */ |
| |
| public void setEnabled(boolean state) { |
| getButton().setEnabled(state); |
| } |
| } |