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annotate dwtx/draw2d/ScrollBarLayout.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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98
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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.ScrollBarLayout;
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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.geometry.Transposer;
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21
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22 import dwtx.draw2d.AbstractLayout;
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23 import dwtx.draw2d.IFigure;
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24 import dwtx.draw2d.ScrollBar;
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25
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26 /**
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27 * Lays out the Figures that make up a ScrollBar.
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28 */
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29 public class ScrollBarLayout
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30 : AbstractLayout
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31 {
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32
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33 /** Used as a constraint for the up arrow figure. */
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34 public static final String UP_ARROW = "up arrow"; //$NON-NLS-1$
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35 /** Used as a constraint for the down arrow figure. */
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36 public static final String DOWN_ARROW = "down arrow"; //$NON-NLS-1$
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37 /** Used as a constraint for the thumb figure. */
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38 public static final String THUMB = "thumb"; //$NON-NLS-1$
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39 /** Used as a constraint for the page up figure. */
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40 public static final String PAGE_UP = "page_up"; //$NON-NLS-1$
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41 /** Used as a constraint for the page down figure. */
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42 public static final String PAGE_DOWN = "page_down"; //$NON-NLS-1$
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43
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44 IFigure up, down, thumb, pageUp, pageDown;
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45
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46 /**
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47 * Transposes values if the ScrollBar is horizontally oriented. When used properly, the
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48 * layout manager just needs to code for one case: vertical orientation.
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49 */
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50 protected final Transposer transposer;
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51
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52 /**
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53 * Constructs a ScrollBarLayout. If the given Transposer is enabled, the Scrollbar will
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54 * be horizontally oriented. Otherwise, the ScrollBar will be vertically oriented.
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55 *
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56 * @param t the Transposer
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57 * @since 2.0
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58 */
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59 public this(Transposer t) {
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60 transposer = t;
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61 }
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62
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63 /**
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64 * @see AbstractLayout#setConstraint(IFigure, Object)
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65 */
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66 public void setConstraint(IFigure figure, Object constraint_) {
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67 String constraint = stringcast(constraint_);
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68 if (constraint.equals(UP_ARROW))
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69 up = figure;
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70 else if (constraint.equals(DOWN_ARROW))
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71 down = figure;
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72 else if (constraint.equals(THUMB))
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73 thumb = figure;
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74 else if (constraint.equals(PAGE_UP))
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75 pageUp = figure;
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76 else if (constraint.equals(PAGE_DOWN))
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77 pageDown = figure;
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78 }
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79
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80 /**
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81 * @see AbstractLayout#calculatePreferredSize(IFigure, int, int)
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82 */
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83 protected Dimension calculatePreferredSize(IFigure parent, int w, int h) {
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84 Insets insets = transposer.t(parent.getInsets());
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85 Dimension d = new Dimension(16, 16 * 4);
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86 d.expand(insets.getWidth(), insets.getHeight());
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87 return transposer.t(d);
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88 }
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89
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90 /**
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91 * @see LayoutManager#layout(IFigure)
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92 */
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93 public void layout(IFigure parent) {
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94 ScrollBar scrollBar = cast(ScrollBar) parent;
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95
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96 Rectangle trackBounds = layoutButtons(scrollBar);
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97
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98 int extent = scrollBar.getExtent();
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99 int max = scrollBar.getMaximum();
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100 int min = scrollBar.getMinimum();
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101 int totalRange = max - min;
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102 int valueRange = totalRange - extent;
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103 if ((valueRange < 1) || (!scrollBar.isEnabled())) {
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104 Rectangle boundsUpper = new Rectangle(trackBounds),
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105 boundsLower = new Rectangle(trackBounds);
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106 boundsUpper.height /= 2;
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107 boundsLower.y += boundsUpper.height;
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108 boundsLower.height = trackBounds.height - boundsUpper.height;
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109 if (pageUp !is null)
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110 pageUp.setBounds(transposer.t(boundsUpper));
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111 if (pageDown !is null)
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112 pageDown.setBounds(transposer.t(boundsLower));
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113 return;
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114 }
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115
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116 if (totalRange is 0)
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117 return;
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118 int thumbHeight = Math.max(thumb is null ? 0 : thumb.getMinimumSize().height,
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119 trackBounds.height * extent / totalRange);
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120
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121 if (thumb !is null)
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122 thumb.setVisible(trackBounds.height > thumbHeight);
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123
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124 int thumbY = trackBounds.y + (trackBounds.height - thumbHeight)
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125 * (scrollBar.getValue() - min) / valueRange;
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126
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127 Rectangle thumbBounds = new Rectangle(
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128 trackBounds.x,
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129 thumbY,
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130 trackBounds.width,
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131 thumbHeight);
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132
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133 if (thumb !is null)
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134 thumb.setBounds(transposer.t(thumbBounds));
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135
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136 if (pageUp !is null)
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137 pageUp.setBounds(transposer.t(new Rectangle(
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138 trackBounds.x,
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139 trackBounds.y,
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140 trackBounds.width,
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141 thumbBounds.y - trackBounds.y)));
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142
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143 if (pageDown !is null)
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144 pageDown.setBounds(transposer.t(new Rectangle(
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145 trackBounds.x ,
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146 thumbBounds.y + thumbHeight,
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147 trackBounds.width,
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148 trackBounds.bottom() - thumbBounds.bottom())));
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149 }
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150
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151 /**
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152 * Places the buttons and returns the Rectangle into which the track should be placed.
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153 * The track consists of the pageup, pagedown, and thumb figures. The Rectangle returned
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154 * should be transposed correctly, that is, it should be vertically oriented. Users of
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155 * the rectangle will re-transpose it for horizontal use.
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156 *
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157 * @param scrollBar the scrollbar whose buttons are being layed out
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158 * @return the Rectangle into which the track should be placed
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159 * @since 2.0
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160 */
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161 protected Rectangle layoutButtons(ScrollBar scrollBar) {
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162 Rectangle bounds = transposer.t(scrollBar.getClientArea());
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163 Dimension buttonSize = new Dimension(
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164 bounds.width,
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165 Math.min(bounds.width, bounds.height / 2));
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166
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167 if (up !is null)
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168 up.setBounds(transposer.t(
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169 new Rectangle(bounds.getTopLeft(), buttonSize)));
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170 if (down !is null) {
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171 Rectangle r = new Rectangle (
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172 bounds.x, bounds.bottom() - buttonSize.height,
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173 buttonSize.width, buttonSize.height);
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174 down.setBounds(transposer.t(r));
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175 }
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176
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177 Rectangle trackBounds = bounds.getCropped(
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178 new Insets(
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179 (up is null) ? 0 : buttonSize.height, 0,
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180 (down is null) ? 0 : buttonSize.height, 0));
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181
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182 return trackBounds;
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183 }
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184
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185 /**
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186 * @see LayoutManager#remove(IFigure)
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187 */
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188 public void remove(IFigure child) {
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189 if (child is up) {
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190 up = null;
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191 } else if (child is down) {
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192 down = null;
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193 } else if (child is thumb) {
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194 thumb = null;
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195 } else if (child is pageUp) {
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196 pageUp = null;
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197 } else if (child is pageDown) {
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198 pageDown = null;
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199 }
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200 }
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201 }