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annotate dwt/custom/StackLayout.d @ 0:380af2bdd8e5

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Upload of whole dwt tree
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sat, 09 Aug 2008 17:00:02 +0200
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 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 *******************************************************************************/
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11 module dwt.custom;
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12
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13
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14 import dwt.*;
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15 import dwt.graphics.*;
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16 import dwt.widgets.*;
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17
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18 /**
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19 * This Layout stacks all the controls one on top of the other and resizes all controls
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20 * to have the same size and location.
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21 * The control specified in topControl is visible and all other controls are not visible.
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22 * Users must set the topControl value to flip between the visible items and then call
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23 * layout() on the composite which has the StackLayout.
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24 *
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25 * <p> Here is an example which places ten buttons in a stack layout and
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26 * flips between them:
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27 *
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28 * <pre><code>
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29 * public static void main(String[] args) {
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30 * Display display = new Display();
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31 * Shell shell = new Shell(display);
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32 * shell.setLayout(new GridLayout());
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33 *
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34 * final Composite parent = new Composite(shell, DWT.NONE);
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35 * parent.setLayoutData(new GridData(GridData.FILL_BOTH));
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36 * final StackLayout layout = new StackLayout();
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37 * parent.setLayout(layout);
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38 * final Button[] bArray = new Button[10];
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39 * for (int i = 0; i &lt; 10; i++) {
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40 * bArray[i] = new Button(parent, DWT.PUSH);
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41 * bArray[i].setText("Button "+i);
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42 * }
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43 * layout.topControl = bArray[0];
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44 *
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45 * Button b = new Button(shell, DWT.PUSH);
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46 * b.setText("Show Next Button");
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47 * final int[] index = new int[1];
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48 * b.addListener(DWT.Selection, new Listener(){
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49 * public void handleEvent(Event e) {
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50 * index[0] = (index[0] + 1) % 10;
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51 * layout.topControl = bArray[index[0]];
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52 * parent.layout();
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53 * }
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54 * });
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55 *
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56 * shell.open();
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57 * while (shell !is null && !shell.isDisposed()) {
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58 * if (!display.readAndDispatch())
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59 * display.sleep();
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60 * }
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61 * }
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62 * </code></pre>
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63 */
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64
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65 public class StackLayout : Layout {
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66
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67 /**
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68 * marginWidth specifies the number of pixels of horizontal margin
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69 * that will be placed along the left and right edges of the layout.
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70 *
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71 * The default value is 0.
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72 */
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73 public int marginWidth = 0;
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74 /**
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75 * marginHeight specifies the number of pixels of vertical margin
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76 * that will be placed along the top and bottom edges of the layout.
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77 *
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78 * The default value is 0.
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79 */
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80 public int marginHeight = 0;
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81
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82 /**
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83 * topControl the Control that is displayed at the top of the stack.
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84 * All other controls that are children of the parent composite will not be visible.
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85 */
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86 public Control topControl;
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87
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88 protected Point computeSize(Composite composite, int wHint, int hHint, bool flushCache) {
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89 Control children[] = composite.getChildren();
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90 int maxWidth = 0;
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91 int maxHeight = 0;
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92 for (int i = 0; i < children.length; i++) {
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93 Point size = children[i].computeSize(wHint, hHint, flushCache);
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94 maxWidth = Math.max(size.x, maxWidth);
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95 maxHeight = Math.max(size.y, maxHeight);
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96 }
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97 int width = maxWidth + 2 * marginWidth;
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98 int height = maxHeight + 2 * marginHeight;
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99 if (wHint !is DWT.DEFAULT) width = wHint;
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100 if (hHint !is DWT.DEFAULT) height = hHint;
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101 return new Point(width, height);
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102 }
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103
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104 protected bool flushCache(Control control) {
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105 return true;
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106 }
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107
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108 protected void layout(Composite composite, bool flushCache) {
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109 Control children[] = composite.getChildren();
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110 Rectangle rect = composite.getClientArea();
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111 rect.x += marginWidth;
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112 rect.y += marginHeight;
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113 rect.width -= 2 * marginWidth;
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114 rect.height -= 2 * marginHeight;
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115 for (int i = 0; i < children.length; i++) {
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116 children[i].setBounds(rect);
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117 children[i].setVisible(children[i] is topControl);
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118
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119 }
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120 }
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121
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122 String getName () {
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123 String String = getClass ().getName ();
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124 int index = String.lastIndexOf ('.');
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125 if (index is -1) return String;
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126 return String.substring (index + 1, String.length ());
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127 }
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128
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129 /**
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130 * Returns a String containing a concise, human-readable
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131 * description of the receiver.
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132 *
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133 * @return a String representation of the layout
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134 */
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135 public String toString () {
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136 String String = getName ()+" {";
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137 if (marginWidth !is 0) String += "marginWidth="+marginWidth+" ";
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138 if (marginHeight !is 0) String += "marginHeight="+marginHeight+" ";
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139 if (topControl !is null) String += "topControl="+topControl+" ";
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140 String = String.trim();
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141 String += "}";
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142 return String;
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143 }
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144 }