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annotate dwtx/draw2d/ScrollPaneLayout.d @ 192:c3583c6ec027

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Added missing default cases for switch statements
author Frank Benoit <benoit@tionex.de>
date Mon, 03 Nov 2008 22:52:26 +0100
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.ScrollPaneLayout;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import dwtx.draw2d.geometry.Dimension;
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18 import dwtx.draw2d.geometry.Insets;
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19 import dwtx.draw2d.geometry.Rectangle;
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20
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21 import dwtx.draw2d.AbstractHintLayout;
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22 import dwtx.draw2d.IFigure;
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23 import dwtx.draw2d.ScrollPane;
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24 import dwtx.draw2d.ScrollBar;
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25 import dwtx.draw2d.Viewport;
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26 import dwtx.draw2d.ScrollPaneSolver;
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27
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28 /**
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29 * The ScrollPaneLayout is responsible for laying out the {@link Viewport} and
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30 * {@link ScrollBar ScrollBars} of a {@link ScrollPane}.
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31 */
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32 public class ScrollPaneLayout
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33 : AbstractHintLayout
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34 {
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35
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36 /** @see ScrollPane#NEVER */
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37 protected static const int NEVER = ScrollPane.NEVER;
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38 /** @see ScrollPane#AUTOMATIC */
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39 protected static const int AUTO = ScrollPane.AUTOMATIC;
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40 /** @see ScrollPane#ALWAYS */
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41 protected static const int ALWAYS = ScrollPane.ALWAYS;
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42
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43 /**
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44 * @see AbstractHintLayout#calculateMinimumSize(IFigure, int, int)
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45 */
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46 public Dimension calculateMinimumSize(IFigure figure, int w, int h) {
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47 ScrollPane scrollpane = cast(ScrollPane)figure;
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48 Insets insets = scrollpane.getInsets();
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49 Dimension d = scrollpane.getViewport().getMinimumSize(w, h);
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50 return d.getExpanded(insets.getWidth(), insets.getHeight());
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51 }
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52
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53 /**
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54 * Calculates and returns the preferred size of the container based on the given hints.
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55 * If the given ScrollPane's (<i>container</i>) horizontal and vertical scroll bar
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56 * visibility is not {@link ScrollPane#NEVER}, then space for those bars is always
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57 * deducted from the hints (whether or not we actually need the scroll bars).
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58 *
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59 * @param container the ScrollPane whose preferred size needs to be calculated
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60 * @param wHint the width hint
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61 * @param hHint the height hint
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62 * @return the preferred size of the given container
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63 * @since 2.0
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64 */
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65 protected Dimension calculatePreferredSize(IFigure container, int wHint, int hHint) {
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66 ScrollPane scrollpane = cast(ScrollPane)container;
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67 ScrollBar hBar = scrollpane.getHorizontalScrollBar();
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68 ScrollBar vBar = scrollpane.getVerticalScrollBar();
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69 Insets insets = scrollpane.getInsets();
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70
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71 int reservedWidth = insets.getWidth();
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72 int reservedHeight = insets.getHeight();
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73
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74 if (scrollpane.getVerticalScrollBarVisibility() !is ScrollPane.NEVER)
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75 reservedWidth += vBar.getPreferredSize().width;
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76 if (scrollpane.getHorizontalScrollBarVisibility() !is ScrollPane.NEVER)
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77 reservedHeight += hBar.getPreferredSize().height;
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78
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79 if (wHint > -1)
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80 wHint = Math.max(0, wHint - reservedWidth);
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81 if (hHint > -1)
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82 hHint = Math.max(0, hHint - reservedHeight);
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83
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84 return scrollpane
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85 .getViewport()
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86 .getPreferredSize(wHint, hHint)
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87 .getExpanded(reservedWidth, reservedHeight);
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88 }
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89
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90 /**
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91 * @see dwtx.draw2d.LayoutManager#layout(IFigure)
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92 */
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93 public void layout(IFigure parent) {
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94 ScrollPane scrollpane = cast(ScrollPane)parent;
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95 Viewport viewport = scrollpane.getViewport();
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96 ScrollBar hBar = scrollpane.getHorizontalScrollBar(),
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97 vBar = scrollpane.getVerticalScrollBar();
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98
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99 ScrollPaneSolver.Result result = ScrollPaneSolver.solve(
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100 parent.getClientArea(),
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101 viewport,
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102 scrollpane.getHorizontalScrollBarVisibility(),
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103 scrollpane.getVerticalScrollBarVisibility(),
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104 vBar.getPreferredSize().width,
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105 hBar.getPreferredSize().height);
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106
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107 if (result.showV) {
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108 vBar.setBounds(new Rectangle(
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109 result.viewportArea.right(),
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110 result.viewportArea.y,
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111 result.insets.right,
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112 result.viewportArea.height));
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113 }
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114 if (result.showH) {
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115 hBar.setBounds(new Rectangle(
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116 result.viewportArea.x,
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117 result.viewportArea.bottom(),
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118 result.viewportArea.width,
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119 result.insets.bottom));
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120 }
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121 vBar.setVisible(result.showV);
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122 hBar.setVisible(result.showH);
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123
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124 int vStepInc = vBar.getStepIncrement();
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125 int vPageInc = vBar.getRangeModel().getExtent() - vStepInc;
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126 if (vPageInc < vStepInc)
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127 vPageInc = vStepInc;
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128 vBar.setPageIncrement(vPageInc);
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129
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130 int hStepInc = hBar.getStepIncrement();
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131 int hPageInc = hBar.getRangeModel().getExtent() - hStepInc;
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132 if (hPageInc < hStepInc)
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133 hPageInc = hStepInc;
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134 hBar.setPageIncrement(hPageInc);
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135 }
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136
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137 }