1 /*
2  * (c) Copyright IBM Corp. 2000, 2001.
3  * All Rights Reserved.
4  */
5 package net.sourceforge.phpeclipse.preferences;
6 
7 import org.eclipse.jface.resource.JFaceResources;
8 import org.eclipse.swt.SWT;
9 import org.eclipse.swt.events.DisposeEvent;
10 import org.eclipse.swt.events.DisposeListener;
11 import org.eclipse.swt.events.SelectionAdapter;
12 import org.eclipse.swt.events.SelectionEvent;
13 import org.eclipse.swt.graphics.Color;
14 import org.eclipse.swt.graphics.Font;
15 import org.eclipse.swt.graphics.GC;
16 import org.eclipse.swt.graphics.Image;
17 import org.eclipse.swt.graphics.Point;
18 import org.eclipse.swt.graphics.RGB;
19 import org.eclipse.swt.widgets.Button;
20 import org.eclipse.swt.widgets.ColorDialog;
21 import org.eclipse.swt.widgets.Composite;
22 import org.eclipse.swt.widgets.Control;
23 import org.eclipse.swt.widgets.Display;
24 
25 /**
26  * A "button" of a certain color determined by the color picker.
27  */
28 public class ColorEditor {
29 
30 	private Point fExtent;
31 
32 	private Image fImage;
33 
34 	private RGB fColorValue;
35 
36 	private Color fColor;
37 
38 	private Button fButton;
39 
ColorEditor(Composite parent)40 	public ColorEditor(Composite parent) {
41 
42 		fButton = new Button(parent, SWT.PUSH);
43 		fExtent = computeImageSize(parent);
44 		fImage = new Image(parent.getDisplay(), fExtent.x, fExtent.y);
45 
46 		GC gc = new GC(fImage);
47 		gc.setBackground(fButton.getBackground());
48 		gc.fillRectangle(0, 0, fExtent.x, fExtent.y);
49 		gc.dispose();
50 
51 		fButton.setImage(fImage);
52 		fButton.addSelectionListener(new SelectionAdapter() {
53 			public void widgetSelected(SelectionEvent event) {
54 				ColorDialog colorDialog = new ColorDialog(fButton.getShell());
55 				colorDialog.setRGB(fColorValue);
56 				RGB newColor = colorDialog.open();
57 				if (newColor != null) {
58 					fColorValue = newColor;
59 					updateColorImage();
60 				}
61 			}
62 		});
63 
64 		fButton.addDisposeListener(new DisposeListener() {
65 			public void widgetDisposed(DisposeEvent event) {
66 				if (fImage != null) {
67 					fImage.dispose();
68 					fImage = null;
69 				}
70 				if (fColor != null) {
71 					fColor.dispose();
72 					fColor = null;
73 				}
74 			}
75 		});
76 	}
77 
getColorValue()78 	public RGB getColorValue() {
79 		return fColorValue;
80 	}
81 
setColorValue(RGB rgb)82 	public void setColorValue(RGB rgb) {
83 		fColorValue = rgb;
84 		updateColorImage();
85 	}
86 
getButton()87 	public Button getButton() {
88 		return fButton;
89 	}
90 
updateColorImage()91 	protected void updateColorImage() {
92 
93 		Display display = fButton.getDisplay();
94 
95 		GC gc = new GC(fImage);
96 		gc.setForeground(display.getSystemColor(SWT.COLOR_BLACK));
97 		gc.drawRectangle(0, 2, fExtent.x - 1, fExtent.y - 4);
98 
99 		if (fColor != null)
100 			fColor.dispose();
101 
102 		fColor = new Color(display, fColorValue);
103 		gc.setBackground(fColor);
104 		gc.fillRectangle(1, 3, fExtent.x - 2, fExtent.y - 5);
105 		gc.dispose();
106 
107 		fButton.setImage(fImage);
108 	}
109 
computeImageSize(Control window)110 	protected Point computeImageSize(Control window) {
111 		GC gc = new GC(window);
112 		Font f = JFaceResources.getFontRegistry().get(
113 				JFaceResources.DEFAULT_FONT);
114 		gc.setFont(f);
115 		int height = gc.getFontMetrics().getHeight();
116 		gc.dispose();
117 		Point p = new Point(height * 3 - 6, height);
118 		return p;
119 	}
120 }