net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/preferences/ColorEditor.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.ui.preferences;
  12
  13 import org.eclipse.jface.resource.JFaceResources;
  14 import org.eclipse.swt.SWT;
  15 import org.eclipse.swt.events.DisposeEvent;
  16 import org.eclipse.swt.events.DisposeListener;
  17 import org.eclipse.swt.events.SelectionAdapter;
  18 import org.eclipse.swt.events.SelectionEvent;
  19 import org.eclipse.swt.graphics.Color;
  20 import org.eclipse.swt.graphics.Font;
  21 import org.eclipse.swt.graphics.GC;
  22 import org.eclipse.swt.graphics.Image;
  23 import org.eclipse.swt.graphics.Point;
  24 import org.eclipse.swt.graphics.RGB;
  25 import org.eclipse.swt.widgets.Button;
  26 import org.eclipse.swt.widgets.ColorDialog;
  27 import org.eclipse.swt.widgets.Composite;
  28 import org.eclipse.swt.widgets.Control;
  29 import org.eclipse.swt.widgets.Display;
  30
  31 /**
  32  * A "button" of a certain color determined by the color picker.
  33  */
  34 public class ColorEditor {
  35
  36         private Point fExtent;
  37         private Image fImage;
  38         private RGB fColorValue;
  39         private Color fColor;
  40         private Button fButton;
  41
  42         public ColorEditor(Composite parent) {
  43
  44                 fButton= new Button(parent, SWT.PUSH);
  45                 fExtent= computeImageSize(parent);
  46                 fImage= new Image(parent.getDisplay(), fExtent.x, fExtent.y);
  47
  48                 GC gc= new GC(fImage);
  49                 gc.setBackground(fButton.getBackground());
  50                 gc.fillRectangle(0, 0, fExtent.x, fExtent.y);
  51                 gc.dispose();
  52
  53                 fButton.setImage(fImage);
  54                 fButton.addSelectionListener(new SelectionAdapter() {
  55                         public void widgetSelected(SelectionEvent event) {
  56                                 ColorDialog colorDialog= new ColorDialog(fButton.getShell());
  57                                 colorDialog.setRGB(fColorValue);
  58                                 RGB newColor = colorDialog.open();
  59                                 if (newColor != null) {
  60                                         fColorValue= newColor;
  61                                         updateColorImage();
  62                                 }
  63                         }
  64                 });
  65
  66                 fButton.addDisposeListener(new DisposeListener() {
  67                         public void widgetDisposed(DisposeEvent event) {
  68                                 if (fImage != null)  {
  69                                         fImage.dispose();
  70                                         fImage= null;
  71                                 }
  72                                 if (fColor != null) {
  73                                         fColor.dispose();
  74                                         fColor= null;
  75                                 }
  76                         }
  77                 });
  78         }
  79
  80         public RGB getColorValue() {
  81                 return fColorValue;
  82         }
  83
  84         public void setColorValue(RGB rgb) {
  85                 fColorValue= rgb;
  86                 updateColorImage();
  87         }
  88
  89         public Button getButton() {
  90                 return fButton;
  91         }
  92
  93         protected void updateColorImage() {
  94
  95                 Display display= fButton.getDisplay();
  96
  97                 GC gc= new GC(fImage);
  98                 gc.setForeground(display.getSystemColor(SWT.COLOR_BLACK));
  99                 gc.drawRectangle(0, 2, fExtent.x - 1, fExtent.y - 4);
 100
 101                 if (fColor != null)
 102                         fColor.dispose();
 103
 104                 fColor= new Color(display, fColorValue);
 105                 gc.setBackground(fColor);
 106                 gc.fillRectangle(1, 3, fExtent.x - 2, fExtent.y - 5);
 107                 gc.dispose();
 108
 109                 fButton.setImage(fImage);
 110         }
 111
 112         protected Point computeImageSize(Control window) {
 113                 GC gc= new GC(window);
 114                 Font f= JFaceResources.getFontRegistry().get(JFaceResources.DEFAULT_FONT);
 115                 gc.setFont(f);
 116                 int height= gc.getFontMetrics().getHeight();
 117                 gc.dispose();
 118                 Point p= new Point(height * 3 - 6, height);
 119                 return p;
 120         }
 121 }