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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 import java.lang.all;
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16
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17
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18 import org.eclipse.swt.SWT;
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19 import org.eclipse.swt.graphics.Point;
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20 import org.eclipse.swt.graphics.Rectangle;
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21 import org.eclipse.swt.widgets.Composite;
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22 import org.eclipse.swt.widgets.Control;
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23 import org.eclipse.swt.widgets.Layout;
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24 import org.eclipse.swt.widgets.ScrollBar;
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25 import org.eclipse.swt.custom.ScrolledComposite;
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26
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27
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28 /**
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29 * This class provides the layout for ScrolledComposite
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30 *
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31 * @see ScrolledComposite
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32 */
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33 class ScrolledCompositeLayout : Layout {
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34
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35 bool inLayout = false;
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36 static final int DEFAULT_WIDTH = 64;
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37 static final int DEFAULT_HEIGHT = 64;
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38
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39 protected override Point computeSize(Composite composite, int wHint, int hHint, bool flushCache) {
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40 ScrolledComposite sc = cast(ScrolledComposite)composite;
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41 Point size = new Point(DEFAULT_WIDTH, DEFAULT_HEIGHT);
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42 if (sc.content !is null) {
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43 Point preferredSize = sc.content.computeSize(wHint, hHint, flushCache);
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44 Point currentSize = sc.content.getSize();
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45 size.x = sc.getExpandHorizontal() ? preferredSize.x : currentSize.x;
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46 size.y = sc.getExpandVertical() ? preferredSize.y : currentSize.y;
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47 }
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48 size.x = Math.max(size.x, sc.minWidth);
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49 size.y = Math.max(size.y, sc.minHeight);
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50 if (wHint !is SWT.DEFAULT) size.x = wHint;
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51 if (hHint !is SWT.DEFAULT) size.y = hHint;
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52 return size;
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53 }
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54
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55 protected override bool flushCache(Control control) {
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56 return true;
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57 }
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58
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59 protected override void layout(Composite composite, bool flushCache) {
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60 if (inLayout) return;
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61 ScrolledComposite sc = cast(ScrolledComposite)composite;
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62 if (sc.content is null) return;
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63 ScrollBar hBar = sc.getHorizontalBar();
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64 ScrollBar vBar = sc.getVerticalBar();
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65 if (hBar !is null) {
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66 if (hBar.getSize().y >= sc.getSize().y) {
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67 return;
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68 }
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69 }
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70 if (vBar !is null) {
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71 if (vBar.getSize().x >= sc.getSize().x) {
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72 return;
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73 }
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74 }
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75 inLayout = true;
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76 Rectangle contentRect = sc.content.getBounds();
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77 if (!sc.alwaysShowScroll) {
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78 bool hVisible = sc.needHScroll(contentRect, false);
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79 bool vVisible = sc.needVScroll(contentRect, hVisible);
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80 if (!hVisible && vVisible) hVisible = sc.needHScroll(contentRect, vVisible);
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81 if (hBar !is null) hBar.setVisible(hVisible);
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82 if (vBar !is null) vBar.setVisible(vVisible);
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83 }
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84 Rectangle hostRect = sc.getClientArea();
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85 if (sc.expandHorizontal) {
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86 contentRect.width = Math.max(sc.minWidth, hostRect.width);
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87 }
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88 if (sc.expandVertical) {
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89 contentRect.height = Math.max(sc.minHeight, hostRect.height);
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90 }
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91
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92 if (hBar !is null) {
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93 hBar.setMaximum (contentRect.width);
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94 hBar.setThumb (Math.min (contentRect.width, hostRect.width));
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95 int hPage = contentRect.width - hostRect.width;
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96 int hSelection = hBar.getSelection ();
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97 if (hSelection >= hPage) {
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98 if (hPage <= 0) {
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99 hSelection = 0;
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100 hBar.setSelection(0);
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101 }
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102 contentRect.x = -hSelection;
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103 }
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104 }
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105
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106 if (vBar !is null) {
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107 vBar.setMaximum (contentRect.height);
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108 vBar.setThumb (Math.min (contentRect.height, hostRect.height));
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109 int vPage = contentRect.height - hostRect.height;
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110 int vSelection = vBar.getSelection ();
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111 if (vSelection >= vPage) {
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112 if (vPage <= 0) {
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113 vSelection = 0;
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114 vBar.setSelection(0);
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115 }
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116 contentRect.y = -vSelection;
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117 }
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118 }
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119
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120 sc.content.setBounds (contentRect);
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121 inLayout = false;
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122 }
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123 }
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