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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.GridData;
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12
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13 import dwt.SWT;
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14 import dwt.graphics.Point;
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15 import dwt.widgets.Control;
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16
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17 import tango.text.Util;
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18 import tango.util.Convert;
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19
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20 /**
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21 * <code>GridData</code> is the layout data object associated with
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22 * <code>GridLayout</code>. To set a <code>GridData</code> object into a
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23 * control, you use the <code>Control.setLayoutData(Object)</code> method.
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24 * <p>
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25 * There are two ways to create a <code>GridData</code> object with certain
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26 * fields set. The first is to set the fields directly, like this:
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27 * <pre>
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28 * GridData gridData = new GridData();
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29 * gridData.horizontalAlignment = GridData.FILL;
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30 * gridData.grabExcessHorizontalSpace = true;
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31 * button1.setLayoutData(gridData);
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32 * </pre>
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33 * The second is to take advantage of convenience style bits defined
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34 * by <code>GridData</code>:
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35 * <pre>
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36 * button1.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.GRAB_HORIZONTAL));
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37 * </pre>
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38 * </p>
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39 * <p>
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40 * NOTE: Do not reuse <code>GridData</code> objects. Every control in a
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41 * <code>Composite</code> that is managed by a <code>GridLayout</code>
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42 * must have a unique <code>GridData</code> object. If the layout data
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43 * for a control in a <code>GridLayout</code> is null at layout time,
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44 * a unique <code>GridData</code> object is created for it.
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45 * </p>
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46 *
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47 * @see GridLayout
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48 * @see Control#setLayoutData
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49 */
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50 public final class GridData {
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51 /**
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52 * verticalAlignment specifies how controls will be positioned
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53 * vertically within a cell.
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54 *
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55 * The default value is CENTER.
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56 *
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57 * Possible values are: <ul>
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58 * <li>SWT.BEGINNING (or SWT.TOP): Position the control at the top of the cell</li>
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59 * <li>SWT.CENTER: Position the control in the vertical center of the cell</li>
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60 * <li>SWT.END (or SWT.BOTTOM): Position the control at the bottom of the cell</li>
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61 * <li>SWT.FILL: Resize the control to fill the cell vertically</li>
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62 * </ul>
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63 */
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64 public int verticalAlignment = CENTER;
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65
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66 /**
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67 * horizontalAlignment specifies how controls will be positioned
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68 * horizontally within a cell.
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69 *
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70 * The default value is BEGINNING.
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71 *
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72 * Possible values are: <ul>
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73 * <li>SWT.BEGINNING (or SWT.LEFT): Position the control at the left of the cell</li>
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74 * <li>SWT.CENTER: Position the control in the horizontal center of the cell</li>
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75 * <li>SWT.END (or SWT.RIGHT): Position the control at the right of the cell</li>
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76 * <li>SWT.FILL: Resize the control to fill the cell horizontally</li>
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77 * </ul>
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78 */
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79 public int horizontalAlignment = BEGINNING;
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80
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81 /**
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82 * widthHint specifies the preferred width in pixels. This value
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83 * is the wHint passed into Control.computeSize(int, int, bool)
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84 * to determine the preferred size of the control.
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85 *
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86 * The default value is SWT.DEFAULT.
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87 *
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88 * @see Control#computeSize(int, int, bool)
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89 */
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90 public int widthHint = SWT.DEFAULT;
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91
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92 /**
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93 * heightHint specifies the preferred height in pixels. This value
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94 * is the hHint passed into Control.computeSize(int, int, bool)
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95 * to determine the preferred size of the control.
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96 *
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97 * The default value is SWT.DEFAULT.
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98 *
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99 * @see Control#computeSize(int, int, bool)
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100 */
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101 public int heightHint = SWT.DEFAULT;
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102
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103 /**
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104 * horizontalIndent specifies the number of pixels of indentation
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105 * that will be placed along the left side of the cell.
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106 *
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107 * The default value is 0.
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108 */
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109 public int horizontalIndent = 0;
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110
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111 /**
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112 * verticalIndent specifies the number of pixels of indentation
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113 * that will be placed along the top side of the cell.
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114 *
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115 * The default value is 0.
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116 *
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117 * @since 3.1
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118 */
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119 public int verticalIndent = 0;
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120
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121 /**
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122 * horizontalSpan specifies the number of column cells that the control
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123 * will take up.
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124 *
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125 * The default value is 1.
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126 */
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127 public int horizontalSpan = 1;
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128
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129 /**
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130 * verticalSpan specifies the number of row cells that the control
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131 * will take up.
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132 *
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133 * The default value is 1.
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134 */
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135 public int verticalSpan = 1;
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136
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137 /**
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138 * <p>grabExcessHorizontalSpace specifies whether the width of the cell
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139 * changes depending on the size of the parent Composite. If
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140 * grabExcessHorizontalSpace is <code>true</code>, the following rules
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141 * apply to the width of the cell:</p>
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142 * <ul>
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143 * <li>If extra horizontal space is available in the parent, the cell will
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144 * grow to be wider than its preferred width. The new width
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145 * will be "preferred width + delta" where delta is the extra
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146 * horizontal space divided by the number of grabbing columns.</li>
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147 * <li>If there is not enough horizontal space available in the parent, the
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148 * cell will shrink until it reaches its minimum width as specified by
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149 * GridData.minimumWidth. The new width will be the maximum of
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150 * "minimumWidth" and "preferred width - delta", where delta is
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151 * the amount of space missing divided by the number of grabbing columns.</li>
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152 * <li>If the parent is packed, the cell will be its preferred width
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153 * as specified by GridData.widthHint.</li>
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154 * <li>If the control spans multiple columns and there are no other grabbing
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155 * controls in any of the spanned columns, the last column in the span will
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156 * grab the extra space. If there is at least one other grabbing control
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157 * in the span, the grabbing will be spread over the columns already
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158 * marked as grabExcessHorizontalSpace.</li>
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159 * </ul>
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160 *
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161 * <p>The default value is false.</p>
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162 *
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163 * @see GridData#minimumWidth
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164 * @see GridData#widthHint
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165 */
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166 public bool grabExcessHorizontalSpace = false;
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167
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168 /**
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169 * <p>grabExcessVerticalSpace specifies whether the height of the cell
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170 * changes depending on the size of the parent Composite. If
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171 * grabExcessVerticalSpace is <code>true</code>, the following rules
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172 * apply to the height of the cell:</p>
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173 * <ul>
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174 * <li>If extra vertical space is available in the parent, the cell will
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175 * grow to be taller than its preferred height. The new height
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176 * will be "preferred height + delta" where delta is the extra
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177 * vertical space divided by the number of grabbing rows.</li>
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178 * <li>If there is not enough vertical space available in the parent, the
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179 * cell will shrink until it reaches its minimum height as specified by
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180 * GridData.minimumHeight. The new height will be the maximum of
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181 * "minimumHeight" and "preferred height - delta", where delta is
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182 * the amount of space missing divided by the number of grabbing rows.</li>
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183 * <li>If the parent is packed, the cell will be its preferred height
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184 * as specified by GridData.heightHint.</li>
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185 * <li>If the control spans multiple rows and there are no other grabbing
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186 * controls in any of the spanned rows, the last row in the span will
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187 * grab the extra space. If there is at least one other grabbing control
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188 * in the span, the grabbing will be spread over the rows already
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189 * marked as grabExcessVerticalSpace.</li>
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190 * </ul>
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191 *
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192 * <p>The default value is false.</p>
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193 *
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194 * @see GridData#minimumHeight
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195 * @see GridData#heightHint
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196 */
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197 public bool grabExcessVerticalSpace = false;
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198
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199 /**
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200 * minimumWidth specifies the minimum width in pixels. This value
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201 * applies only if grabExcessHorizontalSpace is true. A value of
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202 * SWT.DEFAULT means that the minimum width will be the result
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203 * of Control.computeSize(int, int, bool) where wHint is
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204 * determined by GridData.widthHint.
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205 *
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206 * The default value is 0.
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207 *
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208 * @since 3.1
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209 * @see Control#computeSize(int, int, bool)
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210 * @see GridData#widthHint
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211 */
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212 public int minimumWidth = 0;
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213
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214 /**
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215 * minimumHeight specifies the minimum height in pixels. This value
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216 * applies only if grabExcessVerticalSpace is true. A value of
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217 * SWT.DEFAULT means that the minimum height will be the result
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218 * of Control.computeSize(int, int, bool) where hHint is
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219 * determined by GridData.heightHint.
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220 *
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221 * The default value is 0.
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222 *
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223 * @since 3.1
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224 * @see Control#computeSize(int, int, bool)
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225 * @see GridData#heightHint
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226 */
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227 public int minimumHeight = 0;
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228
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229 /**
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230 * exclude informs the layout to ignore this control when sizing
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231 * and positioning controls. If this value is <code>true</code>,
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232 * the size and position of the control will not be managed by the
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233 * layout. If this value is <code>false</code>, the size and
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234 * position of the control will be computed and assigned.
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235 *
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236 * The default value is <code>false</code>.
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237 *
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238 * @since 3.1
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239 */
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240 public bool exclude = false;
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241
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242 /**
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243 * Value for horizontalAlignment or verticalAlignment.
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244 * Position the control at the top or left of the cell.
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245 * Not recommended. Use SWT.BEGINNING, SWT.TOP or SWT.LEFT instead.
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246 */
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247 public static const int BEGINNING = SWT.BEGINNING;
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248
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249 /**
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250 * Value for horizontalAlignment or verticalAlignment.
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251 * Position the control in the vertical or horizontal center of the cell
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252 * Not recommended. Use SWT.CENTER instead.
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253 */
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254 public static const int CENTER = 2;
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255
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256 /**
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257 * Value for horizontalAlignment or verticalAlignment.
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258 * Position the control at the bottom or right of the cell
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259 * Not recommended. Use SWT.END, SWT.BOTTOM or SWT.RIGHT instead.
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260 */
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261 public static const int END = 3;
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262
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263 /**
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264 * Value for horizontalAlignment or verticalAlignment.
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265 * Resize the control to fill the cell horizontally or vertically.
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266 * Not recommended. Use SWT.FILL instead.
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267 */
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268 public static const int FILL = SWT.FILL;
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269
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270 /**
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271 * Style bit for <code>new GridData(int)</code>.
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272 * Position the control at the top of the cell.
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273 * Not recommended. Use
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274 * <code>new GridData(int, SWT.BEGINNING, bool, bool)</code>
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275 * instead.
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276 */
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277 public static const int VERTICAL_ALIGN_BEGINNING = 1 << 1;
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278
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279 /**
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280 * Style bit for <code>new GridData(int)</code> to position the
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281 * control in the vertical center of the cell.
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282 * Not recommended. Use
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283 * <code>new GridData(int, SWT.CENTER, bool, bool)</code>
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284 * instead.
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285 */
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286 public static const int VERTICAL_ALIGN_CENTER = 1 << 2;
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287
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288 /**
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289 * Style bit for <code>new GridData(int)</code> to position the
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290 * control at the bottom of the cell.
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291 * Not recommended. Use
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292 * <code>new GridData(int, SWT.END, bool, bool)</code>
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293 * instead.
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294 */
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295 public static const int VERTICAL_ALIGN_END = 1 << 3;
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296
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297 /**
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298 * Style bit for <code>new GridData(int)</code> to resize the
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299 * control to fill the cell vertically.
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300 * Not recommended. Use
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301 * <code>new GridData(int, SWT.FILL, bool, bool)</code>
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302 * instead
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303 */
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304 public static const int VERTICAL_ALIGN_FILL = 1 << 4;
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305
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306 /**
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307 * Style bit for <code>new GridData(int)</code> to position the
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308 * control at the left of the cell.
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309 * Not recommended. Use
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310 * <code>new GridData(SWT.BEGINNING, int, bool, bool)</code>
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311 * instead.
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312 */
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313 public static const int HORIZONTAL_ALIGN_BEGINNING = 1 << 5;
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314
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315 /**
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316 * Style bit for <code>new GridData(int)</code> to position the
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317 * control in the horizontal center of the cell.
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318 * Not recommended. Use
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319 * <code>new GridData(SWT.CENTER, int, bool, bool)</code>
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320 * instead.
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321 */
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322 public static const int HORIZONTAL_ALIGN_CENTER = 1 << 6;
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323
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324 /**
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325 * Style bit for <code>new GridData(int)</code> to position the
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326 * control at the right of the cell.
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327 * Not recommended. Use
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328 * <code>new GridData(SWT.END, int, bool, bool)</code>
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329 * instead.
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330 */
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331 public static const int HORIZONTAL_ALIGN_END = 1 << 7;
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332
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333 /**
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334 * Style bit for <code>new GridData(int)</code> to resize the
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335 * control to fill the cell horizontally.
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336 * Not recommended. Use
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337 * <code>new GridData(SWT.FILL, int, bool, bool)</code>
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338 * instead.
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339 */
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340 public static const int HORIZONTAL_ALIGN_FILL = 1 << 8;
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341
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342 /**
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343 * Style bit for <code>new GridData(int)</code> to resize the
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344 * control to fit the remaining horizontal space.
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345 * Not recommended. Use
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346 * <code>new GridData(int, int, true, bool)</code>
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347 * instead.
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348 */
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349 public static const int GRAB_HORIZONTAL = 1 << 9;
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350
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351 /**
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352 * Style bit for <code>new GridData(int)</code> to resize the
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353 * control to fit the remaining vertical space.
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354 * Not recommended. Use
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355 * <code>new GridData(int, int, bool, true)</code>
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356 * instead.
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357 */
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358 public static const int GRAB_VERTICAL = 1 << 10;
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359
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360 /**
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361 * Style bit for <code>new GridData(int)</code> to resize the
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362 * control to fill the cell vertically and to fit the remaining
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363 * vertical space.
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364 * FILL_VERTICAL = VERTICAL_ALIGN_FILL | GRAB_VERTICAL
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365 * Not recommended. Use
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366 * <code>new GridData(int, SWT.FILL, bool, true)</code>
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367 * instead.
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368 */
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369 public static const int FILL_VERTICAL = VERTICAL_ALIGN_FILL | GRAB_VERTICAL;
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370
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371 /**
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372 * Style bit for <code>new GridData(int)</code> to resize the
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373 * control to fill the cell horizontally and to fit the remaining
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374 * horizontal space.
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375 * FILL_HORIZONTAL = HORIZONTAL_ALIGN_FILL | GRAB_HORIZONTAL
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376 * Not recommended. Use
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377 * <code>new GridData(SWT.FILL, int, true, bool)</code>
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378 * instead.
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379 */
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380 public static const int FILL_HORIZONTAL = HORIZONTAL_ALIGN_FILL | GRAB_HORIZONTAL;
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381
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382 /**
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383 * Style bit for <code>new GridData(int)</code> to resize the
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384 * control to fill the cell horizontally and vertically and
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385 * to fit the remaining horizontal and vertical space.
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386 * FILL_BOTH = FILL_VERTICAL | FILL_HORIZONTAL
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387 * Not recommended. Use
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388 * <code>new GridData(SWT.FILL, SWT.FILL, true, true)</code>
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389 * instead.
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390 */
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391 public static const int FILL_BOTH = FILL_VERTICAL | FILL_HORIZONTAL;
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392
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393 int cacheWidth = -1, cacheHeight = -1;
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394 int defaultWhint, defaultHhint, defaultWidth = -1, defaultHeight = -1;
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395 int currentWhint, currentHhint, currentWidth = -1, currentHeight = -1;
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396
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397 /**
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398 * Constructs a new instance of GridData using
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399 * default values.
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400 */
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401 public this () {
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402 }
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403
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404 /**
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405 * Constructs a new instance based on the GridData style.
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406 * This constructor is not recommended.
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407 *
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408 * @param style the GridData style
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409 */
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410 public this (int style) {
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411 if ((style & VERTICAL_ALIGN_BEGINNING) !is 0) verticalAlignment = BEGINNING;
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412 if ((style & VERTICAL_ALIGN_CENTER) !is 0) verticalAlignment = CENTER;
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413 if ((style & VERTICAL_ALIGN_FILL) !is 0) verticalAlignment = FILL;
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414 if ((style & VERTICAL_ALIGN_END) !is 0) verticalAlignment = END;
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415 if ((style & HORIZONTAL_ALIGN_BEGINNING) !is 0) horizontalAlignment = BEGINNING;
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416 if ((style & HORIZONTAL_ALIGN_CENTER) !is 0) horizontalAlignment = CENTER;
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417 if ((style & HORIZONTAL_ALIGN_FILL) !is 0) horizontalAlignment = FILL;
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418 if ((style & HORIZONTAL_ALIGN_END) !is 0) horizontalAlignment = END;
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419 grabExcessHorizontalSpace = (style & GRAB_HORIZONTAL) !is 0;
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420 grabExcessVerticalSpace = (style & GRAB_VERTICAL) !is 0;
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421 }
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422
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423 /**
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424 * Constructs a new instance of GridData according to the parameters.
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425 *
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426 * @param horizontalAlignment how control will be positioned horizontally within a cell
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427 * @param verticalAlignment how control will be positioned vertically within a cell
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428 * @param grabExcessHorizontalSpace whether cell will be made wide enough to fit the remaining horizontal space
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429 * @param grabExcessVerticalSpace whether cell will be made high enough to fit the remaining vertical space
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430 *
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431 * @since 3.0
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432 */
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433 public this (int horizontalAlignment, int verticalAlignment, bool grabExcessHorizontalSpace, bool grabExcessVerticalSpace) {
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434 this (horizontalAlignment, verticalAlignment, grabExcessHorizontalSpace, grabExcessVerticalSpace, 1, 1);
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435 }
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436
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437 /**
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438 * Constructs a new instance of GridData according to the parameters.
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439 *
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440 * @param horizontalAlignment how control will be positioned horizontally within a cell
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441 * @param verticalAlignment how control will be positioned vertically within a cell
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442 * @param grabExcessHorizontalSpace whether cell will be made wide enough to fit the remaining horizontal space
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443 * @param grabExcessVerticalSpace whether cell will be made high enough to fit the remaining vertical space
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444 * @param horizontalSpan the number of column cells that the control will take up
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445 * @param verticalSpan the number of row cells that the control will take up
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446 *
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447 * @since 3.0
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448 */
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449 public this (int horizontalAlignment, int verticalAlignment, bool grabExcessHorizontalSpace, bool grabExcessVerticalSpace, int horizontalSpan, int verticalSpan) {
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450 this.horizontalAlignment = horizontalAlignment;
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451 this.verticalAlignment = verticalAlignment;
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452 this.grabExcessHorizontalSpace = grabExcessHorizontalSpace;
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453 this.grabExcessVerticalSpace = grabExcessVerticalSpace;
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454 this.horizontalSpan = horizontalSpan;
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455 this.verticalSpan = verticalSpan;
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456 }
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457
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458 /**
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459 * Constructs a new instance of GridData according to the parameters.
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460 * A value of SWT.DEFAULT indicates that no minimum width or
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461 * no minimum height is specified.
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462 *
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463 * @param width a minimum width for the column
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464 * @param height a minimum height for the row
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465 *
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466 * @since 3.0
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467 */
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468 public this (int width, int height) {
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469 this.widthHint = width;
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470 this.heightHint = height;
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471 }
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472
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473 void computeSize (Control control, int wHint, int hHint, bool flushCache) {
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474 if (cacheWidth !is -1 && cacheHeight !is -1) return;
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475 if (wHint is this.widthHint && hHint is this.heightHint) {
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476 if (defaultWidth is -1 || defaultHeight is -1 || wHint !is defaultWhint || hHint !is defaultHhint) {
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477 Point size = control.computeSize (wHint, hHint, flushCache);
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478 defaultWhint = wHint;
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479 defaultHhint = hHint;
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480 defaultWidth = size.x;
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481 defaultHeight = size.y;
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482 }
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483 cacheWidth = defaultWidth;
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484 cacheHeight = defaultHeight;
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485 return;
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486 }
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487 if (currentWidth is -1 || currentHeight is -1 || wHint !is currentWhint || hHint !is currentHhint) {
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488 Point size = control.computeSize (wHint, hHint, flushCache);
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489 currentWhint = wHint;
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490 currentHhint = hHint;
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491 currentWidth = size.x;
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492 currentHeight = size.y;
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493 }
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494 cacheWidth = currentWidth;
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495 cacheHeight = currentHeight;
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496 }
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497
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498 void flushCache () {
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499 cacheWidth = cacheHeight = -1;
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500 defaultWidth = defaultHeight = -1;
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501 currentWidth = currentHeight = -1;
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502 }
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503
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504 char[] getName () {
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505 char[] string = this.classinfo.name;
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506 int index = locatePrior( string, '.');
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507 if (index is string.length ) return string;
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508 return string[ index + 1 .. string.length ];
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509 }
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510
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511 /**
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512 * Returns a string containing a concise, human-readable
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513 * description of the receiver.
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514 *
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515 * @return a string representation of the GridData object
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516 */
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517 public char[] toString () {
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518 char[] hAlign = "";
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519 switch (horizontalAlignment) {
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520 case SWT.FILL: hAlign = "SWT.FILL"; break;
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521 case SWT.BEGINNING: hAlign = "SWT.BEGINNING"; break;
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522 case SWT.LEFT: hAlign = "SWT.LEFT"; break;
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523 case SWT.END: hAlign = "SWT.END"; break;
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524 case END: hAlign = "GridData.END"; break;
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525 case SWT.RIGHT: hAlign = "SWT.RIGHT"; break;
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526 case SWT.CENTER: hAlign = "SWT.CENTER"; break;
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527 case CENTER: hAlign = "GridData.CENTER"; break;
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528 default: hAlign = "Undefined "~to!(char[])(horizontalAlignment); break;
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529 }
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530 char[] vAlign = "";
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531 switch (verticalAlignment) {
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532 case SWT.FILL: vAlign = "SWT.FILL"; break;
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533 case SWT.BEGINNING: vAlign = "SWT.BEGINNING"; break;
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534 case SWT.TOP: vAlign = "SWT.TOP"; break;
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535 case SWT.END: vAlign = "SWT.END"; break;
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536 case END: vAlign = "GridData.END"; break;
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537 case SWT.BOTTOM: vAlign = "SWT.BOTTOM"; break;
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538 case SWT.CENTER: vAlign = "SWT.CENTER"; break;
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539 case CENTER: vAlign = "GridData.CENTER"; break;
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540 default: vAlign = "Undefined "~to!(char[])(verticalAlignment); break;
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541 }
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542 char[] string = getName()~" {";
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543 string ~= "horizontalAlignment="~to!(char[])(hAlign)~" ";
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544 if (horizontalIndent !is 0) string ~= "horizontalIndent="~to!(char[])(horizontalIndent)~" ";
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545 if (horizontalSpan !is 1) string ~= "horizontalSpan="~to!(char[])(horizontalSpan)~" ";
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546 if (grabExcessHorizontalSpace) string ~= "grabExcessHorizontalSpace="~to!(char[])(grabExcessHorizontalSpace)~" ";
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547 if (widthHint !is SWT.DEFAULT) string ~= "widthHint="~to!(char[])(widthHint)~" ";
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548 if (minimumWidth !is 0) string ~= "minimumWidth="~to!(char[])(minimumWidth)~" ";
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549 string ~= "verticalAlignment="~vAlign~" ";
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550 if (verticalIndent !is 0) string ~= "verticalIndent="~to!(char[])(verticalIndent)~" ";
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551 if (verticalSpan !is 1) string ~= "verticalSpan="~to!(char[])(verticalSpan)~" ";
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552 if (grabExcessVerticalSpace) string ~= "grabExcessVerticalSpace="~to!(char[])(grabExcessVerticalSpace)~" ";
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553 if (heightHint !is SWT.DEFAULT) string ~= "heightHint="~to!(char[])(heightHint)~" ";
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554 if (minimumHeight !is 0) string ~= "minimumHeight="~to!(char[])(minimumHeight)~" ";
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555 if (exclude) string ~= "exclude="~to!(char[])(exclude)~" ";
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556 string = string.trim();
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557 string ~= "}";
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558 return string;
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559 }
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560 }
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