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annotate dwtx/draw2d/ScrollPaneSolver.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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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.ScrollPaneSolver;
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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 import dwtx.draw2d.Viewport;
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21
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22 /**
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23 * This class handles the calculation of solving for the area of a
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24 * {@link dwtx.draw2d.ScrollPane}'s viewport and insets. Also determines if
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25 * the horizontal and vertical scrollbars should be visible.
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26 */
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27 public class ScrollPaneSolver {
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28
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29 /** Scrollbar visibility constants -- never show scrollbars **/
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30 public static const int NEVER = 0;
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31 /** Scrollbar visibility constants -- show scrollbars automatically **/
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32 public static const int AUTOMATIC = 1;
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33 /** Scrollbar visibility constants -- always show scrollbars **/
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34 public static const int ALWAYS = 2;
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35
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36 /**
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37 * Container class for the results of ScrollPaneSolver's solve method
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38 */
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39 public static class Result {
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40 /** Show horizontal scrollbar bool **/
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41 public bool showH;
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42
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43 /** Show vertical scrollbar bool **/
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44 public bool showV;
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45
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46 /** Area of ScrollPane's viewport **/
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47 public Rectangle viewportArea;
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48
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49 /** Insets of ScrollPane **/
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50 public Insets insets;
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51 }
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52
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53 /**
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54 * Solves for the viewport area, insets, and visibility of horizontal and vertical
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55 * scrollbars of a ScrollPane
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56 * @param clientArea The ScrollPane's client area
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57 * @param viewport The ScrollPane's Viewport
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58 * @param hVis Horizontal scrollbar visibility
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59 * @param vVis Vertical scrollbar visibility
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60 * @param vBarWidth Width of vertical scrollbar
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61 * @param hBarHeight Height of horizontal scrollbar
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62 * @return the Result
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63 */
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64 public static Result solve(Rectangle clientArea, Viewport viewport, int hVis, int vVis,
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65 int vBarWidth, int hBarHeight) {
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66 Result result = new Result();
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67 result.insets = new Insets();
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68 result.insets.bottom = hBarHeight;
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69 result.insets.right = vBarWidth;
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70
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71 Dimension available = clientArea.getSize();
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72 Dimension guaranteed = (new Dimension(available)).shrink(
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73 (vVis is NEVER ? 0 : result.insets.right),
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74 (hVis is NEVER ? 0 : result.insets.bottom));
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75 guaranteed.width = Math.max(guaranteed.width, 0);
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76 guaranteed.height = Math.max(guaranteed.height, 0);
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77 int wHint = guaranteed.width;
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78 int hHint = guaranteed.height;
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79
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80 Dimension preferred = viewport.getPreferredSize(wHint, hHint).getCopy();
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81 Insets viewportInsets = viewport.getInsets();
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82 /*
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83 * This was calling viewport.getMinimumSize(), but viewport's minimum size was really
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84 * small, and wasn't a function of its contents.
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85 */
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86 Dimension viewportMinSize = new Dimension(
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87 viewportInsets.getWidth(), viewportInsets.getHeight());
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88 if (viewport.getContents() !is null) {
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89 if (viewport.getContentsTracksHeight() && hHint > -1)
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90 hHint = Math.max(0, hHint - viewportInsets.getHeight());
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91 if (viewport.getContentsTracksWidth() && wHint > -1)
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92 wHint = Math.max(0, wHint - viewportInsets.getWidth());
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93 viewportMinSize.expand(
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94 viewport.getContents().getMinimumSize(wHint, hHint));
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95 }
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96
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97 /*
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98 * Adjust preferred size if tracking flags set. Basically, tracking is "compress view
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99 * until its minimum size is reached".
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100 */
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101 if (viewport.getContentsTracksHeight())
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102 preferred.height = viewportMinSize.height;
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103 if (viewport.getContentsTracksWidth())
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104 preferred.width = viewportMinSize.width;
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105
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106 bool none = available.contains(preferred),
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107 both = !none && preferred.containsProper(guaranteed),
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108 showV = both || preferred.height > available.height,
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109 showH = both || preferred.width > available.width;
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110
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111 //Adjust for visibility override flags
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112 result.showV = vVis !is NEVER && (showV || vVis is ALWAYS);
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113 result.showH = hVis !is NEVER && (showH || hVis is ALWAYS);
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114
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115 if (!result.showV)
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116 result.insets.right = 0;
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117 if (!result.showH)
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118 result.insets.bottom = 0;
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119 result.viewportArea = clientArea.getCropped(result.insets);
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120 viewport.setBounds(result.viewportArea);
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121 return result;
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122 }
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123
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124 }