Mercurial > projects > dwt-mac
annotate dwt/custom/ScrolledCompositeLayout.d @ 0:380af2bdd8e5
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author | Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com> |
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date | Sat, 09 Aug 2008 17:00:02 +0200 |
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children | e831403a80a9 |
rev | line source |
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0
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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 import dwt.*; |
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14 import dwt.graphics.*; |
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15 import dwt.widgets.*; |
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16 |
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17 /** |
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18 * This class provides the layout for ScrolledComposite |
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19 * |
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20 * @see ScrolledComposite |
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21 */ |
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22 class ScrolledCompositeLayout : Layout { |
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23 |
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24 bool inLayout = false; |
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25 static final int DEFAULT_WIDTH = 64; |
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26 static final int DEFAULT_HEIGHT = 64; |
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27 |
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28 protected Point computeSize(Composite composite, int wHint, int hHint, bool flushCache) { |
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29 ScrolledComposite sc = (ScrolledComposite)composite; |
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30 Point size = new Point(DEFAULT_WIDTH, DEFAULT_HEIGHT); |
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31 if (sc.content !is null) { |
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32 Point preferredSize = sc.content.computeSize(wHint, hHint, flushCache); |
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33 Point currentSize = sc.content.getSize(); |
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34 size.x = sc.getExpandHorizontal() ? preferredSize.x : currentSize.x; |
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35 size.y = sc.getExpandVertical() ? preferredSize.y : currentSize.y; |
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36 } |
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37 size.x = Math.max(size.x, sc.minWidth); |
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38 size.y = Math.max(size.y, sc.minHeight); |
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39 if (wHint !is DWT.DEFAULT) size.x = wHint; |
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40 if (hHint !is DWT.DEFAULT) size.y = hHint; |
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41 return size; |
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42 } |
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43 |
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44 protected bool flushCache(Control control) { |
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45 return true; |
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46 } |
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47 |
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48 protected void layout(Composite composite, bool flushCache) { |
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49 if (inLayout) return; |
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50 ScrolledComposite sc = (ScrolledComposite)composite; |
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51 if (sc.content is null) return; |
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52 ScrollBar hBar = sc.getHorizontalBar(); |
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53 ScrollBar vBar = sc.getVerticalBar(); |
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54 if (hBar !is null) { |
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55 if (hBar.getSize().y >= sc.getSize().y) { |
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56 return; |
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57 } |
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58 } |
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59 if (vBar !is null) { |
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60 if (vBar.getSize().x >= sc.getSize().x) { |
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61 return; |
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62 } |
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63 } |
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64 inLayout = true; |
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65 Rectangle contentRect = sc.content.getBounds(); |
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66 if (!sc.alwaysShowScroll) { |
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67 bool hVisible = sc.needHScroll(contentRect, false); |
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68 bool vVisible = sc.needVScroll(contentRect, hVisible); |
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69 if (!hVisible && vVisible) hVisible = sc.needHScroll(contentRect, vVisible); |
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70 if (hBar !is null) hBar.setVisible(hVisible); |
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71 if (vBar !is null) vBar.setVisible(vVisible); |
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72 } |
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73 Rectangle hostRect = sc.getClientArea(); |
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74 if (sc.expandHorizontal) { |
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75 contentRect.width = Math.max(sc.minWidth, hostRect.width); |
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76 } |
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77 if (sc.expandVertical) { |
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78 contentRect.height = Math.max(sc.minHeight, hostRect.height); |
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79 } |
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80 |
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81 if (hBar !is null) { |
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82 hBar.setMaximum (contentRect.width); |
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83 hBar.setThumb (Math.min (contentRect.width, hostRect.width)); |
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84 int hPage = contentRect.width - hostRect.width; |
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85 int hSelection = hBar.getSelection (); |
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86 if (hSelection >= hPage) { |
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87 if (hPage <= 0) { |
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88 hSelection = 0; |
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89 hBar.setSelection(0); |
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90 } |
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91 contentRect.x = -hSelection; |
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92 } |
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93 } |
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94 |
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95 if (vBar !is null) { |
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96 vBar.setMaximum (contentRect.height); |
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97 vBar.setThumb (Math.min (contentRect.height, hostRect.height)); |
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98 int vPage = contentRect.height - hostRect.height; |
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99 int vSelection = vBar.getSelection (); |
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100 if (vSelection >= vPage) { |
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101 if (vPage <= 0) { |
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102 vSelection = 0; |
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103 vBar.setSelection(0); |
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104 } |
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105 contentRect.y = -vSelection; |
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106 } |
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107 } |
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108 |
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109 sc.content.setBounds (contentRect); |
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110 inLayout = false; |
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111 } |
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112 } |