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annotate dwtx/draw2d/CheckBox.d @ 103:2d6540440fe6

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Replace static ctors with lazy init.
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 17:01:51 +0200
parents 95307ad235d9
children
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwtx.draw2d.CheckBox;
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14
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15 import dwt.dwthelper.utils;
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16 import dwt.dwthelper.ByteArrayInputStream;
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17
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18 import dwt.graphics.Image;
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19 import dwt.graphics.ImageData;
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20 import dwtx.draw2d.Toggle;
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21 import dwtx.draw2d.Label;
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22 import dwtx.draw2d.ChangeListener;
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23 import dwtx.draw2d.ChangeEvent;
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24 import dwtx.draw2d.ButtonModel;
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25
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26 /**
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27 * A Checkbox is a toggle figure which toggles between the checked and unchecked figures
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28 * to simulate a check box. A check box contains a text label to represent it.
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29 */
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30 public final class CheckBox
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31 : Toggle
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32 {
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33
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34 private Label label = null;
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35
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36 private static Image
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37 UNCHECKED_,
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38 CHECKED_;
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39
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40 package static Image UNCHECKED(){
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41 if( UNCHECKED_ is null ){
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42 synchronized( CheckBox.classinfo ){
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43 if( UNCHECKED_ is null ){
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44 UNCHECKED_ = createImage( getImportData!("dwtx.draw2d.checkboxenabledoff.gif"));
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45 }
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46 }
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47 }
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48 assert( UNCHECKED_ );
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49 return UNCHECKED_;
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50 }
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51 package static Image CHECKED(){
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52 if( CHECKED_ is null ){
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53 synchronized( CheckBox.classinfo ){
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54 if( CHECKED_ is null ){
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55 CHECKED_ = createImage( getImportData!("dwtx.draw2d.checkboxenabledon.gif"));
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56 }
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57 }
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58 }
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59 assert( CHECKED_ );
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60 return CHECKED_;
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61 }
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62
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63 private static Image createImage( ImportData importdata ) {
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64 Image image = new Image(null, new ImageData(new ByteArrayInputStream( cast(byte[]) importdata.data)));
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65 return image;
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66 }
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67
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68 /**
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69 * Constructs a CheckBox with no text.
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70 *
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71 * @since 2.0
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72 */
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73 public this() {
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74 this(""); //$NON-NLS-1$
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75 }
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76
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77 /**
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78 * Constructs a CheckBox with the passed text in its label.
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79 * @param text The label text
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80 * @since 2.0
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81 */
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82 public this(String text) {
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83 setContents(label = new Label(text, UNCHECKED));
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84 }
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85
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86 /**
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87 * Adjusts CheckBox's icon depending on selection status.
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88 *
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89 * @since 2.0
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90 */
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91 protected void handleSelectionChanged() {
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92 if (isSelected())
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93 label.setIcon(CHECKED);
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94 else
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95 label.setIcon(UNCHECKED);
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96 }
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97
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98 /**
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99 * Initializes this Clickable by setting a default model and adding a clickable event
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100 * handler for that model. Also adds a ChangeListener to update icon when selection
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101 * status changes.
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102 *
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103 * @since 2.0
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104 */
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105 protected void init() {
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106 super.init();
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107 addChangeListener(new class() ChangeListener {
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108 public void handleStateChanged(ChangeEvent changeEvent) {
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109 if (changeEvent.getPropertyName().equals(ButtonModel.SELECTED_PROPERTY))
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110 handleSelectionChanged();
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111 }
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112 });
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113 }
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114
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115 }