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annotate dwt/layout/FillLayout.d @ 8:a9ab4c738ed8

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Fix: instanceof
author Frank Benoit <benoit@tionex.de>
date Wed, 27 Aug 2008 14:32:39 +0200
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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.layout.FillLayout;
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12
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13 import dwt.dwthelper.utils;
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14
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15 import dwt.DWT;
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16 import dwt.graphics.Point;
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17 import dwt.graphics.Rectangle;
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18 import dwt.widgets.Composite;
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19 import dwt.widgets.Control;
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20 import dwt.widgets.Layout;
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21 import dwt.widgets.Scrollable;
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22
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23 /**
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24 * <code>FillLayout</code> is the simplest layout class. It lays out
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25 * controls in a single row or column, forcing them to be the same size.
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26 * <p>
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27 * Initially, the controls will all be as tall as the tallest control,
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28 * and as wide as the widest. <code>FillLayout</code> does not wrap,
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29 * but you can specify margins and spacing. You might use it to
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30 * lay out buttons in a task bar or tool bar, or to stack checkboxes
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31 * in a <code>Group</code>. <code>FillLayout</code> can also be used
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32 * when a <code>Composite</code> only has one child. For example,
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33 * if a <code>Shell</code> has a single <code>Group</code> child,
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34 * <code>FillLayout</code> will cause the <code>Group</code> to
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35 * completely fill the <code>Shell</code> (if margins are 0).
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36 * </p>
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37 * <p>
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38 * Example code: first a <code>FillLayout</code> is created and
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39 * its type field is set, and then the layout is set into the
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40 * <code>Composite</code>. Note that in a <code>FillLayout</code>,
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41 * children are always the same size, and they fill all available space.
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42 * <pre>
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43 * FillLayout fillLayout = new FillLayout();
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44 * fillLayout.type = DWT.VERTICAL;
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45 * shell.setLayout(fillLayout);
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46 * </pre>
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47 * </p>
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48 */
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49 public final class FillLayout : Layout {
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50 /**
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51 * type specifies how controls will be positioned
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52 * within the layout.
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53 *
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54 * The default value is HORIZONTAL.
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55 *
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56 * Possible values are: <ul>
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57 * <li>HORIZONTAL: Position the controls horizontally from left to right</li>
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58 * <li>VERTICAL: Position the controls vertically from top to bottom</li>
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59 * </ul>
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60 */
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61 public int type = DWT.HORIZONTAL;
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62
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63 /**
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64 * marginWidth specifies the number of pixels of horizontal margin
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65 * that will be placed along the left and right edges of the layout.
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66 *
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67 * The default value is 0.
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68 *
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69 * @since 3.0
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70 */
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71 public int marginWidth = 0;
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72
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73 /**
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74 * marginHeight specifies the number of pixels of vertical margin
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75 * that will be placed along the top and bottom edges of the layout.
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76 *
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77 * The default value is 0.
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78 *
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79 * @since 3.0
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80 */
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81 public int marginHeight = 0;
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82
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83 /**
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84 * spacing specifies the number of pixels between the edge of one cell
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85 * and the edge of its neighbouring cell.
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86 *
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87 * The default value is 0.
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88 *
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89 * @since 3.0
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90 */
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91 public int spacing = 0;
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92
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93 /**
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94 * Constructs a new instance of this class.
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95 */
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96 public this () {
0
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97 }
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98
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99 /**
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100 * Constructs a new instance of this class given the type.
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101 *
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102 * @param type the type of fill layout
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103 *
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104 * @since 2.0
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105 */
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106 public this (int type) {
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107 this.type = type;
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108 }
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109
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110 protected Point computeSize (Composite composite, int wHint, int hHint, bool flushCache) {
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111 Control [] children = composite.getChildren ();
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112 int count = children.length;
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113 int maxWidth = 0, maxHeight = 0;
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114 for (int i=0; i<count; i++) {
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115 Control child = children [i];
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116 int w = wHint, h = hHint;
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117 if (count > 0) {
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118 if (type is DWT.HORIZONTAL && wHint !is DWT.DEFAULT) {
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119 w = Math.max (0, (wHint - (count - 1) * spacing) / count);
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120 }
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121 if (type is DWT.VERTICAL && hHint !is DWT.DEFAULT) {
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122 h = Math.max (0, (hHint - (count - 1) * spacing) / count);
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123 }
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124 }
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125 Point size = computeChildSize (child, w, h, flushCache);
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126 maxWidth = Math.max (maxWidth, size.x);
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127 maxHeight = Math.max (maxHeight, size.y);
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128 }
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129 int width = 0, height = 0;
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130 if (type is DWT.HORIZONTAL) {
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131 width = count * maxWidth;
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132 if (count !is 0) width += (count - 1) * spacing;
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133 height = maxHeight;
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134 } else {
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135 width = maxWidth;
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parents:
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136 height = count * maxHeight;
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137 if (count !is 0) height += (count - 1) * spacing;
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138 }
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139 width += marginWidth * 2;
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140 height += marginHeight * 2;
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141 if (wHint !is DWT.DEFAULT) width = wHint;
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142 if (hHint !is DWT.DEFAULT) height = hHint;
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143 return new Point (width, height);
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144 }
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145
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146 Point computeChildSize (Control control, int wHint, int hHint, bool flushCache) {
7
e831403a80a9 Add 'cast' to casts
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parents: 5
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147 FillData data = cast(FillData)control.getLayoutData ();
0
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148 if (data is null) {
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149 data = new FillData ();
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150 control.setLayoutData (data);
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151 }
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152 Point size = null;
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153 if (wHint is DWT.DEFAULT && hHint is DWT.DEFAULT) {
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154 size = data.computeSize (control, wHint, hHint, flushCache);
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155 } else {
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parents:
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156 // TEMPORARY CODE
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157 int trimX, trimY;
8
a9ab4c738ed8 Fix: instanceof
Frank Benoit <benoit@tionex.de>
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158 if ( null !is cast(Scrollable)control ) {
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diff changeset
159 Rectangle rect = (cast(Scrollable) control).computeTrim (0, 0, 0, 0);
0
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160 trimX = rect.width;
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parents:
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161 trimY = rect.height;
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162 } else {
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163 trimX = trimY = control.getBorderWidth () * 2;
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164 }
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parents:
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165 int w = wHint is DWT.DEFAULT ? wHint : Math.max (0, wHint - trimX);
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parents:
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166 int h = hHint is DWT.DEFAULT ? hHint : Math.max (0, hHint - trimY);
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parents:
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167 size = data.computeSize (control, w, h, flushCache);
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168 }
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169 return size;
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170 }
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parents:
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171
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172 protected bool flushCache (Control control) {
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parents:
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173 Object data = control.getLayoutData();
7
e831403a80a9 Add 'cast' to casts
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parents: 5
diff changeset
174 if (data !is null) (cast(FillData)data).flushCache();
0
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175 return true;
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parents:
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176 }
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177
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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178 String getName () {
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179 String string = getClass ().getName ();
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180 int index = string.lastIndexOf ('.');
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parents:
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181 if (index is -1) return string;
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182 return string.substring (index + 1, string.length ());
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183 }
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184
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185 protected void layout (Composite composite, bool flushCache) {
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parents:
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186 Rectangle rect = composite.getClientArea ();
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187 Control [] children = composite.getChildren ();
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188 int count = children.length;
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189 if (count is 0) return;
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190 int width = rect.width - marginWidth * 2;
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parents:
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191 int height = rect.height - marginHeight * 2;
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192 if (type is DWT.HORIZONTAL) {
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193 width -= (count - 1) * spacing;
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194 int x = rect.x + marginWidth, extra = width % count;
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195 int y = rect.y + marginHeight, cellWidth = width / count;
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parents:
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196 for (int i=0; i<count; i++) {
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197 Control child = children [i];
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198 int childWidth = cellWidth;
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parents:
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199 if (i is 0) {
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parents:
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200 childWidth += extra / 2;
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parents:
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201 } else {
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parents:
diff changeset
202 if (i is count - 1) childWidth += (extra + 1) / 2;
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parents:
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203 }
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parents:
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204 child.setBounds (x, y, childWidth, height);
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parents:
diff changeset
205 x += childWidth + spacing;
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parents:
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206 }
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parents:
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207 } else {
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parents:
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208 height -= (count - 1) * spacing;
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parents:
diff changeset
209 int x = rect.x + marginWidth, cellHeight = height / count;
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parents:
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210 int y = rect.y + marginHeight, extra = height % count;
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parents:
diff changeset
211 for (int i=0; i<count; i++) {
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parents:
diff changeset
212 Control child = children [i];
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
213 int childHeight = cellHeight;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
214 if (i is 0) {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
215 childHeight += extra / 2;
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parents:
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216 } else {
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parents:
diff changeset
217 if (i is count - 1) childHeight += (extra + 1) / 2;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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218 }
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parents:
diff changeset
219 child.setBounds (x, y, width, childHeight);
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parents:
diff changeset
220 y += childHeight + spacing;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
221 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
222 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
223 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
224
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
225 /**
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parents:
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226 * Returns a string containing a concise, human-readable
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parents:
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227 * description of the receiver.
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
228 *
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parents:
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229 * @return a string representation of the layout
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
230 */
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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231 public String toString () {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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232 String string = getName ()+" {";
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parents:
diff changeset
233 string += "type="+((type is DWT.VERTICAL) ? "DWT.VERTICAL" : "DWT.HORIZONTAL")+" ";
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parents:
diff changeset
234 if (marginWidth !is 0) string += "marginWidth="+marginWidth+" ";
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
235 if (marginHeight !is 0) string += "marginHeight="+marginHeight+" ";
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
236 if (spacing !is 0) string += "spacing="+spacing+" ";
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
237 string = string.trim();
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
238 string += "}";
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
239 return string;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
240 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
241 }