Mercurial > projects > dwt2
annotate org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/custom/ScrolledCompositeLayout.d @ 0:6dd524f61e62
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author | Frank Benoit <benoit@tionex.de> |
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date | Mon, 02 Mar 2009 14:44:16 +0100 |
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children | 6bf2837c50fe |
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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 * 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 org.eclipse.swt.custom.ScrolledCompositeLayout; |
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14 |
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15 |
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16 import org.eclipse.swt.SWT; |
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17 import org.eclipse.swt.graphics.Point; |
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18 import org.eclipse.swt.graphics.Rectangle; |
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19 import org.eclipse.swt.widgets.Composite; |
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20 import org.eclipse.swt.widgets.Control; |
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21 import org.eclipse.swt.widgets.Layout; |
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22 import org.eclipse.swt.widgets.ScrollBar; |
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23 import org.eclipse.swt.custom.ScrolledComposite; |
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24 |
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25 import Math = tango.math.Math; |
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26 |
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27 /** |
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28 * This class provides the layout for ScrolledComposite |
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29 * |
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30 * @see ScrolledComposite |
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31 */ |
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32 class ScrolledCompositeLayout : Layout { |
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33 |
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34 bool inLayout = false; |
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35 static final int DEFAULT_WIDTH = 64; |
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36 static final int DEFAULT_HEIGHT = 64; |
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37 |
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38 protected override Point computeSize(Composite composite, int wHint, int hHint, bool flushCache) { |
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39 ScrolledComposite sc = cast(ScrolledComposite)composite; |
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40 Point size = new Point(DEFAULT_WIDTH, DEFAULT_HEIGHT); |
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41 if (sc.content !is null) { |
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42 Point preferredSize = sc.content.computeSize(wHint, hHint, flushCache); |
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43 Point currentSize = sc.content.getSize(); |
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44 size.x = sc.getExpandHorizontal() ? preferredSize.x : currentSize.x; |
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45 size.y = sc.getExpandVertical() ? preferredSize.y : currentSize.y; |
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46 } |
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47 size.x = Math.max(size.x, sc.minWidth); |
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48 size.y = Math.max(size.y, sc.minHeight); |
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49 if (wHint !is SWT.DEFAULT) size.x = wHint; |
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50 if (hHint !is SWT.DEFAULT) size.y = hHint; |
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51 return size; |
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52 } |
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53 |
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54 protected override bool flushCache(Control control) { |
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55 return true; |
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56 } |
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57 |
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58 protected override void layout(Composite composite, bool flushCache) { |
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59 if (inLayout) return; |
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60 ScrolledComposite sc = cast(ScrolledComposite)composite; |
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61 if (sc.content is null) return; |
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62 ScrollBar hBar = sc.getHorizontalBar(); |
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63 ScrollBar vBar = sc.getVerticalBar(); |
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64 if (hBar !is null) { |
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65 if (hBar.getSize().y >= sc.getSize().y) { |
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66 return; |
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67 } |
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68 } |
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69 if (vBar !is null) { |
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70 if (vBar.getSize().x >= sc.getSize().x) { |
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71 return; |
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72 } |
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73 } |
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74 inLayout = true; |
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75 Rectangle contentRect = sc.content.getBounds(); |
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76 if (!sc.alwaysShowScroll) { |
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77 bool hVisible = sc.needHScroll(contentRect, false); |
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78 bool vVisible = sc.needVScroll(contentRect, hVisible); |
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79 if (!hVisible && vVisible) hVisible = sc.needHScroll(contentRect, vVisible); |
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80 if (hBar !is null) hBar.setVisible(hVisible); |
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81 if (vBar !is null) vBar.setVisible(vVisible); |
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82 } |
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83 Rectangle hostRect = sc.getClientArea(); |
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84 if (sc.expandHorizontal) { |
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85 contentRect.width = Math.max(sc.minWidth, hostRect.width); |
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86 } |
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87 if (sc.expandVertical) { |
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88 contentRect.height = Math.max(sc.minHeight, hostRect.height); |
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89 } |
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90 |
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91 if (hBar !is null) { |
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92 hBar.setMaximum (contentRect.width); |
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93 hBar.setThumb (Math.min (contentRect.width, hostRect.width)); |
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94 int hPage = contentRect.width - hostRect.width; |
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95 int hSelection = hBar.getSelection (); |
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96 if (hSelection >= hPage) { |
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97 if (hPage <= 0) { |
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98 hSelection = 0; |
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99 hBar.setSelection(0); |
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100 } |
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101 contentRect.x = -hSelection; |
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102 } |
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103 } |
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104 |
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105 if (vBar !is null) { |
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106 vBar.setMaximum (contentRect.height); |
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107 vBar.setThumb (Math.min (contentRect.height, hostRect.height)); |
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108 int vPage = contentRect.height - hostRect.height; |
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109 int vSelection = vBar.getSelection (); |
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110 if (vSelection >= vPage) { |
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111 if (vPage <= 0) { |
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112 vSelection = 0; |
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113 vBar.setSelection(0); |
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114 } |
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115 contentRect.y = -vSelection; |
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116 } |
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117 } |
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118 |
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119 sc.content.setBounds (contentRect); |
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120 inLayout = false; |
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121 } |
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122 } |