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.swt.SWT;
  14 import org.eclipse.swt.events.DisposeEvent;
  15 import org.eclipse.swt.events.DisposeListener;
  16 import org.eclipse.swt.events.SelectionAdapter;
  17 import org.eclipse.swt.events.SelectionEvent;
  18 import org.eclipse.swt.graphics.Color;
  19 import org.eclipse.swt.graphics.Font;
  20 import org.eclipse.swt.graphics.GC;
  21 import org.eclipse.swt.graphics.Image;
  22 import org.eclipse.swt.graphics.Point;
  23 import org.eclipse.swt.graphics.RGB;
  24 import org.eclipse.swt.widgets.Button;
  25 import org.eclipse.swt.widgets.ColorDialog;
  26 import org.eclipse.swt.widgets.Composite;
  27 import org.eclipse.swt.widgets.Control;
  28 import org.eclipse.swt.widgets.Display;
  29
  30 import org.eclipse.jface.resource.JFaceResources;
  31
  32 /**
  33  * A "button" of a certain color determined by the color picker.
  34  */
  35 public class ColorEditor {
  36
  37         private Point fExtent;
  38         private Image fImage;
  39         private RGB fColorValue;
  40         private Color fColor;
  41         private Button fButton;
  42
  43         public ColorEditor(Composite parent) {
  44
  45                 fButton= new Button(parent, SWT.PUSH);
  46                 fExtent= computeImageSize(parent);
  47                 fImage= new Image(parent.getDisplay(), fExtent.x, fExtent.y);
  48
  49                 GC gc= new GC(fImage);
  50                 gc.setBackground(fButton.getBackground());
  51                 gc.fillRectangle(0, 0, fExtent.x, fExtent.y);
  52                 gc.dispose();
  53
  54                 fButton.setImage(fImage);
  55                 fButton.addSelectionListener(new SelectionAdapter() {
  56                         public void widgetSelected(SelectionEvent event) {
  57                                 ColorDialog colorDialog= new ColorDialog(fButton.getShell());
  58                                 colorDialog.setRGB(fColorValue);
  59                                 RGB newColor = colorDialog.open();
  60                                 if (newColor != null) {
  61                                         fColorValue= newColor;
  62                                         updateColorImage();
  63                                 }
  64                         }
  65                 });
  66
  67                 fButton.addDisposeListener(new DisposeListener() {
  68                         public void widgetDisposed(DisposeEvent event) {
  69                                 if (fImage != null)  {
  70                                         fImage.dispose();
  71                                         fImage= null;
  72                                 }
  73                                 if (fColor != null) {
  74                                         fColor.dispose();
  75                                         fColor= null;
  76                                 }
  77                         }
  78                 });
  79         }
  80
  81         public RGB getColorValue() {
  82                 return fColorValue;
  83         }
  84
  85         public void setColorValue(RGB rgb) {
  86                 fColorValue= rgb;
  87                 updateColorImage();
  88         }
  89
  90         public Button getButton() {
  91                 return fButton;
  92         }
  93
  94         protected void updateColorImage() {
  95
  96                 Display display= fButton.getDisplay();
  97
  98                 GC gc= new GC(fImage);
  99                 gc.setForeground(display.getSystemColor(SWT.COLOR_BLACK));
 100                 gc.drawRectangle(0, 2, fExtent.x - 1, fExtent.y - 4);
 101
 102                 if (fColor != null)
 103                         fColor.dispose();
 104
 105                 fColor= new Color(display, fColorValue);
 106                 gc.setBackground(fColor);
 107                 gc.fillRectangle(1, 3, fExtent.x - 2, fExtent.y - 5);
 108                 gc.dispose();
 109
 110                 fButton.setImage(fImage);
 111         }
 112
 113         protected Point computeImageSize(Control window) {
 114                 GC gc= new GC(window);
 115                 Font f= JFaceResources.getFontRegistry().get(JFaceResources.DEFAULT_FONT);
 116                 gc.setFont(f);
 117                 int height= gc.getFontMetrics().getHeight();
 118                 gc.dispose();
 119                 Point p= new Point(height * 3 - 6, height);
 120                 return p;
 121         }
 122 }