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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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 org.eclipse.swt.layout.GridData;
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14
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15 import org.eclipse.swt.SWT;
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16 import org.eclipse.swt.graphics.Point;
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17 import org.eclipse.swt.widgets.Control;
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18
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48
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19 import java.lang.all;
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20 version(Tango){
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51
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21 import tango.util.Convert;
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48
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22 } else { // Phobos
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51
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23 import std.conv;
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48
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24 }
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25
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25
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26 /**
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27 * <code>GridData</code> is the layout data object associated with
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28 * <code>GridLayout</code>. To set a <code>GridData</code> object into a
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29 * control, you use the <code>Control.setLayoutData(Object)</code> method.
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30 * <p>
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31 * There are two ways to create a <code>GridData</code> object with certain
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32 * fields set. The first is to set the fields directly, like this:
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33 * <pre>
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34 * GridData gridData = new GridData();
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35 * gridData.horizontalAlignment = GridData.FILL;
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36 * gridData.grabExcessHorizontalSpace = true;
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37 * button1.setLayoutData(gridData);
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38 * </pre>
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39 * The second is to take advantage of convenience style bits defined
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40 * by <code>GridData</code>:
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41 * <pre>
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42 * button1.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.GRAB_HORIZONTAL));
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43 * </pre>
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44 * </p>
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45 * <p>
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46 * NOTE: Do not reuse <code>GridData</code> objects. Every control in a
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47 * <code>Composite</code> that is managed by a <code>GridLayout</code>
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48 * must have a unique <code>GridData</code> object. If the layout data
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49 * for a control in a <code>GridLayout</code> is null at layout time,
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50 * a unique <code>GridData</code> object is created for it.
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51 * </p>
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52 *
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53 * @see GridLayout
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54 * @see Control#setLayoutData
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55 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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56 */
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57 public final class GridData {
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58 /**
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59 * verticalAlignment specifies how controls will be positioned
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60 * vertically within a cell.
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61 *
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62 * The default value is CENTER.
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63 *
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64 * Possible values are: <ul>
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65 * <li>SWT.BEGINNING (or SWT.TOP): Position the control at the top of the cell</li>
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66 * <li>SWT.CENTER: Position the control in the vertical center of the cell</li>
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67 * <li>SWT.END (or SWT.BOTTOM): Position the control at the bottom of the cell</li>
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68 * <li>SWT.FILL: Resize the control to fill the cell vertically</li>
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69 * </ul>
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70 */
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71 public int verticalAlignment = CENTER;
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72
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73 /**
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74 * horizontalAlignment specifies how controls will be positioned
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75 * horizontally within a cell.
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76 *
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77 * The default value is BEGINNING.
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78 *
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79 * Possible values are: <ul>
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80 * <li>SWT.BEGINNING (or SWT.LEFT): Position the control at the left of the cell</li>
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81 * <li>SWT.CENTER: Position the control in the horizontal center of the cell</li>
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82 * <li>SWT.END (or SWT.RIGHT): Position the control at the right of the cell</li>
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83 * <li>SWT.FILL: Resize the control to fill the cell horizontally</li>
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84 * </ul>
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85 */
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86 public int horizontalAlignment = BEGINNING;
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87
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88 /**
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89 * widthHint specifies the preferred width in pixels. This value
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90 * is the wHint passed into Control.computeSize(int, int, bool)
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91 * to determine the preferred size of the control.
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92 *
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93 * The default value is SWT.DEFAULT.
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94 *
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95 * @see Control#computeSize(int, int, bool)
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96 */
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97 public int widthHint = SWT.DEFAULT;
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98
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99 /**
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100 * heightHint specifies the preferred height in pixels. This value
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101 * is the hHint passed into Control.computeSize(int, int, bool)
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102 * to determine the preferred size of the control.
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103 *
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104 * The default value is SWT.DEFAULT.
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105 *
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106 * @see Control#computeSize(int, int, bool)
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107 */
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108 public int heightHint = SWT.DEFAULT;
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109
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110 /**
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111 * horizontalIndent specifies the number of pixels of indentation
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112 * that will be placed along the left side of the cell.
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113 *
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114 * The default value is 0.
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115 */
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116 public int horizontalIndent = 0;
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117
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118 /**
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119 * verticalIndent specifies the number of pixels of indentation
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120 * that will be placed along the top side of the cell.
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121 *
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122 * The default value is 0.
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123 *
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124 * @since 3.1
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125 */
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126 public int verticalIndent = 0;
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127
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128 /**
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129 * horizontalSpan specifies the number of column cells that the control
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130 * will take up.
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131 *
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132 * The default value is 1.
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133 */
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134 public int horizontalSpan = 1;
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135
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136 /**
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137 * verticalSpan specifies the number of row cells that the control
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138 * will take up.
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139 *
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140 * The default value is 1.
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141 */
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142 public int verticalSpan = 1;
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143
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144 /**
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145 * <p>grabExcessHorizontalSpace specifies whether the width of the cell
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146 * changes depending on the size of the parent Composite. If
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147 * grabExcessHorizontalSpace is <code>true</code>, the following rules
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148 * apply to the width of the cell:</p>
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149 * <ul>
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150 * <li>If extra horizontal space is available in the parent, the cell will
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151 * grow to be wider than its preferred width. The new width
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152 * will be "preferred width + delta" where delta is the extra
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153 * horizontal space divided by the number of grabbing columns.</li>
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154 * <li>If there is not enough horizontal space available in the parent, the
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155 * cell will shrink until it reaches its minimum width as specified by
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156 * GridData.minimumWidth. The new width will be the maximum of
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157 * "minimumWidth" and "preferred width - delta", where delta is
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158 * the amount of space missing divided by the number of grabbing columns.</li>
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159 * <li>If the parent is packed, the cell will be its preferred width
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160 * as specified by GridData.widthHint.</li>
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161 * <li>If the control spans multiple columns and there are no other grabbing
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162 * controls in any of the spanned columns, the last column in the span will
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163 * grab the extra space. If there is at least one other grabbing control
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164 * in the span, the grabbing will be spread over the columns already
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165 * marked as grabExcessHorizontalSpace.</li>
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166 * </ul>
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167 *
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168 * <p>The default value is false.</p>
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169 *
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170 * @see GridData#minimumWidth
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171 * @see GridData#widthHint
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172 */
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173 public bool grabExcessHorizontalSpace = false;
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174
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175 /**
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176 * <p>grabExcessVerticalSpace specifies whether the height of the cell
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177 * changes depending on the size of the parent Composite. If
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178 * grabExcessVerticalSpace is <code>true</code>, the following rules
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179 * apply to the height of the cell:</p>
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180 * <ul>
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181 * <li>If extra vertical space is available in the parent, the cell will
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182 * grow to be taller than its preferred height. The new height
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183 * will be "preferred height + delta" where delta is the extra
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184 * vertical space divided by the number of grabbing rows.</li>
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185 * <li>If there is not enough vertical space available in the parent, the
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186 * cell will shrink until it reaches its minimum height as specified by
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187 * GridData.minimumHeight. The new height will be the maximum of
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188 * "minimumHeight" and "preferred height - delta", where delta is
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189 * the amount of space missing divided by the number of grabbing rows.</li>
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190 * <li>If the parent is packed, the cell will be its preferred height
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191 * as specified by GridData.heightHint.</li>
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192 * <li>If the control spans multiple rows and there are no other grabbing
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193 * controls in any of the spanned rows, the last row in the span will
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194 * grab the extra space. If there is at least one other grabbing control
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195 * in the span, the grabbing will be spread over the rows already
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196 * marked as grabExcessVerticalSpace.</li>
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197 * </ul>
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198 *
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199 * <p>The default value is false.</p>
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200 *
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201 * @see GridData#minimumHeight
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202 * @see GridData#heightHint
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203 */
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204 public bool grabExcessVerticalSpace = false;
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205
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206 /**
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207 * minimumWidth specifies the minimum width in pixels. This value
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208 * applies only if grabExcessHorizontalSpace is true. A value of
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209 * SWT.DEFAULT means that the minimum width will be the result
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210 * of Control.computeSize(int, int, bool) where wHint is
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211 * determined by GridData.widthHint.
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212 *
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213 * The default value is 0.
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214 *
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215 * @since 3.1
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216 * @see Control#computeSize(int, int, bool)
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217 * @see GridData#widthHint
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218 */
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219 public int minimumWidth = 0;
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220
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221 /**
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222 * minimumHeight specifies the minimum height in pixels. This value
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223 * applies only if grabExcessVerticalSpace is true. A value of
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224 * SWT.DEFAULT means that the minimum height will be the result
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225 * of Control.computeSize(int, int, bool) where hHint is
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226 * determined by GridData.heightHint.
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227 *
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228 * The default value is 0.
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229 *
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230 * @since 3.1
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231 * @see Control#computeSize(int, int, bool)
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232 * @see GridData#heightHint
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233 */
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234 public int minimumHeight = 0;
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235
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236 /**
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237 * exclude informs the layout to ignore this control when sizing
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238 * and positioning controls. If this value is <code>true</code>,
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239 * the size and position of the control will not be managed by the
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240 * layout. If this value is <code>false</code>, the size and
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241 * position of the control will be computed and assigned.
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242 *
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243 * The default value is <code>false</code>.
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244 *
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245 * @since 3.1
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246 */
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247 public bool exclude = false;
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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 at the top or left of the cell.
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252 * Not recommended. Use SWT.BEGINNING, SWT.TOP or SWT.LEFT instead.
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253 */
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254 public static const int BEGINNING = SWT.BEGINNING;
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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 in the vertical or horizontal center of the cell
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259 * Not recommended. Use SWT.CENTER instead.
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260 */
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261 public static const int CENTER = 2;
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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 * Position the control at the bottom or right of the cell
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266 * Not recommended. Use SWT.END, SWT.BOTTOM or SWT.RIGHT instead.
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267 */
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268 public static const int END = 3;
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269
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270 /**
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271 * Value for horizontalAlignment or verticalAlignment.
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272 * Resize the control to fill the cell horizontally or vertically.
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273 * Not recommended. Use SWT.FILL instead.
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274 */
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275 public static const int FILL = SWT.FILL;
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276
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277 /**
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278 * Style bit for <code>new GridData(int)</code>.
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279 * Position the control at the top of the cell.
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280 * Not recommended. Use
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281 * <code>new GridData(int, SWT.BEGINNING, bool, bool)</code>
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282 * instead.
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283 */
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284 public static const int VERTICAL_ALIGN_BEGINNING = 1 << 1;
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285
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286 /**
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287 * Style bit for <code>new GridData(int)</code> to position the
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288 * control in the vertical center of the cell.
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289 * Not recommended. Use
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290 * <code>new GridData(int, SWT.CENTER, bool, bool)</code>
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291 * instead.
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292 */
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293 public static const int VERTICAL_ALIGN_CENTER = 1 << 2;
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294
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295 /**
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296 * Style bit for <code>new GridData(int)</code> to position the
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297 * control at the bottom of the cell.
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298 * Not recommended. Use
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299 * <code>new GridData(int, SWT.END, bool, bool)</code>
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300 * instead.
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301 */
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302 public static const int VERTICAL_ALIGN_END = 1 << 3;
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303
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304 /**
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305 * Style bit for <code>new GridData(int)</code> to resize the
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306 * control to fill the cell vertically.
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307 * Not recommended. Use
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308 * <code>new GridData(int, SWT.FILL, bool, bool)</code>
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309 * instead
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310 */
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311 public static const int VERTICAL_ALIGN_FILL = 1 << 4;
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312
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313 /**
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314 * Style bit for <code>new GridData(int)</code> to position the
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315 * control at the left of the cell.
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316 * Not recommended. Use
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317 * <code>new GridData(SWT.BEGINNING, int, bool, bool)</code>
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318 * instead.
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319 */
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320 public static const int HORIZONTAL_ALIGN_BEGINNING = 1 << 5;
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321
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322 /**
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323 * Style bit for <code>new GridData(int)</code> to position the
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324 * control in the horizontal center of the cell.
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325 * Not recommended. Use
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326 * <code>new GridData(SWT.CENTER, int, bool, bool)</code>
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327 * instead.
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328 */
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329 public static const int HORIZONTAL_ALIGN_CENTER = 1 << 6;
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330
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331 /**
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332 * Style bit for <code>new GridData(int)</code> to position the
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333 * control at the right of the cell.
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334 * Not recommended. Use
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335 * <code>new GridData(SWT.END, int, bool, bool)</code>
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336 * instead.
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337 */
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338 public static const int HORIZONTAL_ALIGN_END = 1 << 7;
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339
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340 /**
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341 * Style bit for <code>new GridData(int)</code> to resize the
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342 * control to fill the cell horizontally.
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343 * Not recommended. Use
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344 * <code>new GridData(SWT.FILL, int, bool, bool)</code>
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345 * instead.
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346 */
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347 public static const int HORIZONTAL_ALIGN_FILL = 1 << 8;
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348
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349 /**
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350 * Style bit for <code>new GridData(int)</code> to resize the
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351 * control to fit the remaining horizontal space.
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352 * Not recommended. Use
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353 * <code>new GridData(int, int, true, bool)</code>
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354 * instead.
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355 */
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356 public static const int GRAB_HORIZONTAL = 1 << 9;
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357
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358 /**
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359 * Style bit for <code>new GridData(int)</code> to resize the
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360 * control to fit the remaining vertical space.
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361 * Not recommended. Use
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362 * <code>new GridData(int, int, bool, true)</code>
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363 * instead.
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364 */
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365 public static const int GRAB_VERTICAL = 1 << 10;
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366
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367 /**
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368 * Style bit for <code>new GridData(int)</code> to resize the
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369 * control to fill the cell vertically and to fit the remaining
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370 * vertical space.
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371 * FILL_VERTICAL = VERTICAL_ALIGN_FILL | GRAB_VERTICAL
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372 * Not recommended. Use
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373 * <code>new GridData(int, SWT.FILL, bool, true)</code>
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374 * instead.
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375 */
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376 public static const int FILL_VERTICAL = VERTICAL_ALIGN_FILL | GRAB_VERTICAL;
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377
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378 /**
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379 * Style bit for <code>new GridData(int)</code> to resize the
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380 * control to fill the cell horizontally and to fit the remaining
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381 * horizontal space.
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382 * FILL_HORIZONTAL = HORIZONTAL_ALIGN_FILL | GRAB_HORIZONTAL
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383 * Not recommended. Use
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384 * <code>new GridData(SWT.FILL, int, true, bool)</code>
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385 * instead.
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386 */
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387 public static const int FILL_HORIZONTAL = HORIZONTAL_ALIGN_FILL | GRAB_HORIZONTAL;
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388
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389 /**
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390 * Style bit for <code>new GridData(int)</code> to resize the
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391 * control to fill the cell horizontally and vertically and
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392 * to fit the remaining horizontal and vertical space.
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393 * FILL_BOTH = FILL_VERTICAL | FILL_HORIZONTAL
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394 * Not recommended. Use
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395 * <code>new GridData(SWT.FILL, SWT.FILL, true, true)</code>
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396 * instead.
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397 */
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398 public static const int FILL_BOTH = FILL_VERTICAL | FILL_HORIZONTAL;
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399
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400 int cacheWidth = -1, cacheHeight = -1;
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401 int defaultWhint, defaultHhint, defaultWidth = -1, defaultHeight = -1;
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402 int currentWhint, currentHhint, currentWidth = -1, currentHeight = -1;
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403
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404 /**
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405 * Constructs a new instance of GridData using
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406 * default values.
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407 */
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408 public this () {
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409 }
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410
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411 /**
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412 * Constructs a new instance based on the GridData style.
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413 * This constructor is not recommended.
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414 *
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415 * @param style the GridData style
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416 */
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417 public this (int style) {
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418 if ((style & VERTICAL_ALIGN_BEGINNING) !is 0) verticalAlignment = BEGINNING;
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419 if ((style & VERTICAL_ALIGN_CENTER) !is 0) verticalAlignment = CENTER;
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420 if ((style & VERTICAL_ALIGN_FILL) !is 0) verticalAlignment = FILL;
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421 if ((style & VERTICAL_ALIGN_END) !is 0) verticalAlignment = END;
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422 if ((style & HORIZONTAL_ALIGN_BEGINNING) !is 0) horizontalAlignment = BEGINNING;
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423 if ((style & HORIZONTAL_ALIGN_CENTER) !is 0) horizontalAlignment = CENTER;
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424 if ((style & HORIZONTAL_ALIGN_FILL) !is 0) horizontalAlignment = FILL;
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425 if ((style & HORIZONTAL_ALIGN_END) !is 0) horizontalAlignment = END;
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426 grabExcessHorizontalSpace = (style & GRAB_HORIZONTAL) !is 0;
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427 grabExcessVerticalSpace = (style & GRAB_VERTICAL) !is 0;
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428 }
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429
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430 /**
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431 * Constructs a new instance of GridData according to the parameters.
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432 *
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433 * @param horizontalAlignment how control will be positioned horizontally within a cell,
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434 * one of: SWT.BEGINNING (or SWT.LEFT), SWT.CENTER, SWT.END (or SWT.RIGHT), or SWT.FILL
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435 * @param verticalAlignment how control will be positioned vertically within a cell,
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436 * one of: SWT.BEGINNING (or SWT.TOP), SWT.CENTER, SWT.END (or SWT.BOTTOM), or SWT.FILL
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437 * @param grabExcessHorizontalSpace whether cell will be made wide enough to fit the remaining horizontal space
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438 * @param grabExcessVerticalSpace whether cell will be made high enough to fit the remaining vertical space
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439 *
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440 * @since 3.0
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441 */
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442 public this (int horizontalAlignment, int verticalAlignment, bool grabExcessHorizontalSpace, bool grabExcessVerticalSpace) {
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443 this (horizontalAlignment, verticalAlignment, grabExcessHorizontalSpace, grabExcessVerticalSpace, 1, 1);
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444 }
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445
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446 /**
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447 * Constructs a new instance of GridData according to the parameters.
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448 *
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449 * @param horizontalAlignment how control will be positioned horizontally within a cell,
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450 * one of: SWT.BEGINNING (or SWT.LEFT), SWT.CENTER, SWT.END (or SWT.RIGHT), or SWT.FILL
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451 * @param verticalAlignment how control will be positioned vertically within a cell,
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452 * one of: SWT.BEGINNING (or SWT.TOP), SWT.CENTER, SWT.END (or SWT.BOTTOM), or SWT.FILL
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453 * @param grabExcessHorizontalSpace whether cell will be made wide enough to fit the remaining horizontal space
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454 * @param grabExcessVerticalSpace whether cell will be made high enough to fit the remaining vertical space
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455 * @param horizontalSpan the number of column cells that the control will take up
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456 * @param verticalSpan the number of row cells that the control will take up
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457 *
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458 * @since 3.0
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459 */
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460 public this (int horizontalAlignment, int verticalAlignment, bool grabExcessHorizontalSpace, bool grabExcessVerticalSpace, int horizontalSpan, int verticalSpan) {
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461 this.horizontalAlignment = horizontalAlignment;
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462 this.verticalAlignment = verticalAlignment;
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463 this.grabExcessHorizontalSpace = grabExcessHorizontalSpace;
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464 this.grabExcessVerticalSpace = grabExcessVerticalSpace;
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465 this.horizontalSpan = horizontalSpan;
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466 this.verticalSpan = verticalSpan;
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467 }
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468
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469 /**
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470 * Constructs a new instance of GridData according to the parameters.
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471 * A value of SWT.DEFAULT indicates that no minimum width or
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472 * no minimum height is specified.
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473 *
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474 * @param width a minimum width for the column
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475 * @param height a minimum height for the row
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476 *
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477 * @since 3.0
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478 */
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479 public this (int width, int height) {
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480 this.widthHint = width;
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481 this.heightHint = height;
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482 }
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483
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484 void computeSize (Control control, int wHint, int hHint, bool flushCache) {
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485 if (cacheWidth !is -1 && cacheHeight !is -1) return;
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486 if (wHint is this.widthHint && hHint is this.heightHint) {
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487 if (defaultWidth is -1 || defaultHeight is -1 || wHint !is defaultWhint || hHint !is defaultHhint) {
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488 Point size = control.computeSize (wHint, hHint, flushCache);
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489 defaultWhint = wHint;
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490 defaultHhint = hHint;
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491 defaultWidth = size.x;
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492 defaultHeight = size.y;
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493 }
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494 cacheWidth = defaultWidth;
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495 cacheHeight = defaultHeight;
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496 return;
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497 }
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498 if (currentWidth is -1 || currentHeight is -1 || wHint !is currentWhint || hHint !is currentHhint) {
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499 Point size = control.computeSize (wHint, hHint, flushCache);
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500 currentWhint = wHint;
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501 currentHhint = hHint;
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502 currentWidth = size.x;
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503 currentHeight = size.y;
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504 }
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505 cacheWidth = currentWidth;
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506 cacheHeight = currentHeight;
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507 }
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508
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509 void flushCache () {
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510 cacheWidth = cacheHeight = -1;
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511 defaultWidth = defaultHeight = -1;
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512 currentWidth = currentHeight = -1;
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513 }
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514
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515 String getName () {
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516 String string = this.classinfo.name;
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517 int index = string.lastIndexOf('.');
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518 if (index is -1 ) return string;
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519 return string[ index + 1 .. string.length ];
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520 }
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521
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522 /**
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523 * Returns a string containing a concise, human-readable
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524 * description of the receiver.
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525 *
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526 * @return a string representation of the GridData object
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527 */
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528 override public String toString () {
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529 String hAlign = "";
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530 switch (horizontalAlignment) {
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531 case SWT.FILL: hAlign = "SWT.FILL"; break;
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532 case SWT.BEGINNING: hAlign = "SWT.BEGINNING"; break;
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533 case SWT.LEFT: hAlign = "SWT.LEFT"; break;
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534 case SWT.END: hAlign = "SWT.END"; break;
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535 case END: hAlign = "GridData.END"; break;
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536 case SWT.RIGHT: hAlign = "SWT.RIGHT"; break;
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537 case SWT.CENTER: hAlign = "SWT.CENTER"; break;
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538 case CENTER: hAlign = "GridData.CENTER"; break;
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539 default: hAlign = "Undefined "~to!(String)(horizontalAlignment); break;
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540 }
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541 String vAlign = "";
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542 switch (verticalAlignment) {
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543 case SWT.FILL: vAlign = "SWT.FILL"; break;
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544 case SWT.BEGINNING: vAlign = "SWT.BEGINNING"; break;
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545 case SWT.TOP: vAlign = "SWT.TOP"; break;
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546 case SWT.END: vAlign = "SWT.END"; break;
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547 case END: vAlign = "GridData.END"; break;
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548 case SWT.BOTTOM: vAlign = "SWT.BOTTOM"; break;
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549 case SWT.CENTER: vAlign = "SWT.CENTER"; break;
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550 case CENTER: vAlign = "GridData.CENTER"; break;
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551 default: vAlign = "Undefined "~to!(String)(verticalAlignment); break;
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552 }
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553 String string = getName()~" {";
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554 string ~= "horizontalAlignment="~to!(String)(hAlign)~" ";
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555 if (horizontalIndent !is 0) string ~= "horizontalIndent="~to!(String)(horizontalIndent)~" ";
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556 if (horizontalSpan !is 1) string ~= "horizontalSpan="~to!(String)(horizontalSpan)~" ";
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557 if (grabExcessHorizontalSpace) string ~= "grabExcessHorizontalSpace="~to!(String)(grabExcessHorizontalSpace)~" ";
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558 if (widthHint !is SWT.DEFAULT) string ~= "widthHint="~to!(String)(widthHint)~" ";
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559 if (minimumWidth !is 0) string ~= "minimumWidth="~to!(String)(minimumWidth)~" ";
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560 string ~= "verticalAlignment="~vAlign~" ";
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561 if (verticalIndent !is 0) string ~= "verticalIndent="~to!(String)(verticalIndent)~" ";
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562 if (verticalSpan !is 1) string ~= "verticalSpan="~to!(String)(verticalSpan)~" ";
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563 if (grabExcessVerticalSpace) string ~= "grabExcessVerticalSpace="~to!(String)(grabExcessVerticalSpace)~" ";
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564 if (heightHint !is SWT.DEFAULT) string ~= "heightHint="~to!(String)(heightHint)~" ";
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565 if (minimumHeight !is 0) string ~= "minimumHeight="~to!(String)(minimumHeight)~" ";
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566 if (exclude) string ~= "exclude="~to!(String)(exclude)~" ";
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567 string = string.trim();
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568 string ~= "}";
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569 return string;
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570 }
|
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|
571 }
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