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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.RowLayout;
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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.graphics.Rectangle;
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18 import org.eclipse.swt.widgets.Control;
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19 import org.eclipse.swt.widgets.Layout;
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20 import org.eclipse.swt.widgets.Composite;
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21 import org.eclipse.swt.layout.RowData;
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48
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22 import java.lang.all;
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23 version(Tango){
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51
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24 import tango.util.Convert;
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48
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25 } else { // Phobos
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51
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26 import std.conv;
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48
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27 }
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25
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28
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29
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30 /**
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31 * Instances of this class determine the size and position of the
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32 * children of a <code>Composite</code> by placing them either in
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33 * horizontal rows or vertical columns within the parent <code>Composite</code>.
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34 * <p>
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35 * <code>RowLayout</code> aligns all controls in one row if the
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36 * <code>type</code> is set to horizontal, and one column if it is
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37 * set to vertical. It has the ability to wrap, and provides configurable
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38 * margins and spacing. <code>RowLayout</code> has a number of configuration
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39 * fields. In addition, the height and width of each control in a
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40 * <code>RowLayout</code> can be specified by setting a <code>RowData</code>
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41 * object into the control using <code>setLayoutData ()</code>.
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42 * </p>
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43 * <p>
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44 * The following example code creates a <code>RowLayout</code>, sets all
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45 * of its fields to non-default values, and then sets it into a
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46 * <code>Shell</code>.
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47 * <pre>
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48 * RowLayout rowLayout = new RowLayout();
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49 * rowLayout.wrap = false;
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50 * rowLayout.pack = false;
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51 * rowLayout.justify = true;
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52 * rowLayout.type = SWT.VERTICAL;
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53 * rowLayout.marginLeft = 5;
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54 * rowLayout.marginTop = 5;
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55 * rowLayout.marginRight = 5;
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56 * rowLayout.marginBottom = 5;
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57 * rowLayout.spacing = 0;
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58 * shell.setLayout(rowLayout);
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59 * </pre>
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60 * If you are using the default field values, you only need one line of code:
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61 * <pre>
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62 * shell.setLayout(new RowLayout());
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63 * </pre>
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64 * </p>
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65 *
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66 * @see RowData
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67 * @see <a href="http://www.eclipse.org/swt/snippets/#rowlayout">RowLayout snippets</a>
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68 * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: LayoutExample</a>
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69 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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70 */
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71 public final class RowLayout : Layout {
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72
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73 /**
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74 * type specifies whether the layout places controls in rows or
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75 * columns.
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76 *
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77 * The default value is HORIZONTAL.
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78 *
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79 * Possible values are: <ul>
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80 * <li>HORIZONTAL: Position the controls horizontally from left to right</li>
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81 * <li>VERTICAL: Position the controls vertically from top to bottom</li>
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82 * </ul>
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83 *
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84 * @since 2.0
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85 */
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86 public int type = SWT.HORIZONTAL;
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87
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88 /**
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89 * marginWidth specifies the number of pixels of horizontal margin
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90 * that will be placed along the left and right edges of the layout.
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91 *
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92 * The default value is 0.
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93 *
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94 * @since 3.0
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95 */
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96 public int marginWidth = 0;
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97
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98 /**
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99 * marginHeight specifies the number of pixels of vertical margin
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100 * that will be placed along the top and bottom edges of the layout.
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101 *
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102 * The default value is 0.
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103 *
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104 * @since 3.0
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105 */
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106 public int marginHeight = 0;
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107
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108 /**
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109 * spacing specifies the number of pixels between the edge of one cell
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110 * and the edge of its neighbouring cell.
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111 *
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112 * The default value is 3.
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113 */
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114 public int spacing = 3;
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115
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116 /**
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117 * wrap specifies whether a control will be wrapped to the next
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118 * row if there is insufficient space on the current row.
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119 *
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120 * The default value is true.
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121 */
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122 public bool wrap = true;
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123
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124 /**
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125 * pack specifies whether all controls in the layout take
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126 * their preferred size. If pack is false, all controls will
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127 * have the same size which is the size required to accommodate the
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128 * largest preferred height and the largest preferred width of all
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129 * the controls in the layout.
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130 *
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131 * The default value is true.
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132 */
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133 public bool pack = true;
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134
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135 /**
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136 * fill specifies whether the controls in a row should be
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137 * all the same height for horizontal layouts, or the same
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138 * width for vertical layouts.
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139 *
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140 * The default value is false.
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141 *
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142 * @since 3.0
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143 */
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144 public bool fill = false;
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145
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146 /**
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147 * center specifies whether the controls in a row should be
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148 * centered vertically in each cell for horizontal layouts,
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149 * or centered horizontally in each cell for vertical layouts.
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150 *
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151 * The default value is false.
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152 *
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153 * @since 3.4
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154 */
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155 public bool center = false;
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156
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157 /**
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158 * justify specifies whether the controls in a row should be
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159 * fully justified, with any extra space placed between the controls.
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160 *
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161 * The default value is false.
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162 */
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163 public bool justify = false;
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164
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165 /**
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166 * marginLeft specifies the number of pixels of horizontal margin
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167 * that will be placed along the left edge of the layout.
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168 *
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169 * The default value is 3.
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170 */
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171 public int marginLeft = 3;
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172
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173 /**
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174 * marginTop specifies the number of pixels of vertical margin
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175 * that will be placed along the top edge of the layout.
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176 *
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177 * The default value is 3.
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178 */
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179 public int marginTop = 3;
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180
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181 /**
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182 * marginRight specifies the number of pixels of horizontal margin
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183 * that will be placed along the right edge of the layout.
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184 *
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185 * The default value is 3.
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186 */
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187 public int marginRight = 3;
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188
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189 /**
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190 * marginBottom specifies the number of pixels of vertical margin
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191 * that will be placed along the bottom edge of the layout.
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192 *
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193 * The default value is 3.
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194 */
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195 public int marginBottom = 3;
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196
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197 /**
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198 * Constructs a new instance of this class.
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199 */
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200 public this () {
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201 }
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202
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203 /**
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204 * Constructs a new instance of this class given the type.
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205 *
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206 * @param type the type of row layout
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207 *
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208 * @since 2.0
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209 */
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210 public this (int type) {
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211 this.type = type;
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212 }
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213
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214 override protected Point computeSize (Composite composite, int wHint, int hHint, bool flushCache_) {
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215 Point extent;
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216 if (type is SWT.HORIZONTAL) {
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217 extent = layoutHorizontal (composite, false, (wHint !is SWT.DEFAULT) && wrap, wHint, flushCache_);
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218 } else {
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219 extent = layoutVertical (composite, false, (hHint !is SWT.DEFAULT) && wrap, hHint, flushCache_);
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220 }
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221 if (wHint !is SWT.DEFAULT) extent.x = wHint;
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222 if (hHint !is SWT.DEFAULT) extent.y = hHint;
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223 return extent;
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224 }
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225
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226 Point computeSize (Control control, bool flushCache_) {
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227 int wHint = SWT.DEFAULT, hHint = SWT.DEFAULT;
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228 RowData data = cast(RowData) control.getLayoutData ();
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229 if (data !is null) {
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230 wHint = data.width;
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231 hHint = data.height;
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232 }
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233 return control.computeSize (wHint, hHint, flushCache_);
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234 }
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235
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236 override protected bool flushCache (Control control) {
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237 return true;
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238 }
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239
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240 String getName () {
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241 String string = this.classinfo.name;
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242 int index = string.lastIndexOf('.');
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243 if (index is -1 ) return string;
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244 return string[ index + 1 .. string.length ];
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245 }
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246
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247 override protected void layout (Composite composite, bool flushCache_) {
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248 Rectangle clientArea = composite.getClientArea ();
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249 if (type is SWT.HORIZONTAL) {
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250 layoutHorizontal (composite, true, wrap, clientArea.width, flushCache_);
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251 } else {
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252 layoutVertical (composite, true, wrap, clientArea.height, flushCache_);
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253 }
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254 }
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255
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256 Point layoutHorizontal (Composite composite, bool move, bool wrap, int width, bool flushCache_) {
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257 Control [] children = composite.getChildren ();
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258 int count = 0;
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259 for (int i=0; i<children.length; i++) {
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260 Control control = children [i];
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261 RowData data = cast(RowData) control.getLayoutData ();
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262 if (data is null || !data.exclude) {
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263 children [count++] = children [i];
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264 }
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265 }
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266 if (count is 0) {
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267 return new Point (marginLeft + marginWidth * 2 + marginRight, marginTop + marginHeight * 2 + marginBottom);
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268 }
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269 int childWidth = 0, childHeight = 0, maxHeight = 0;
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270 if (!pack) {
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271 for (int i=0; i<count; i++) {
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272 Control child = children [i];
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273 Point size = computeSize (child, flushCache_);
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274 childWidth = Math.max (childWidth, size.x);
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275 childHeight = Math.max (childHeight, size.y);
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276 }
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277 maxHeight = childHeight;
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278 }
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279 int clientX = 0, clientY = 0;
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280 if (move) {
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281 Rectangle rect = composite.getClientArea ();
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282 clientX = rect.x;
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283 clientY = rect.y;
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284 }
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285 int [] wraps = null;
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286 bool wrapped = false;
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287 Rectangle [] bounds = null;
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288 if (move && (justify || fill || center)) {
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289 bounds = new Rectangle [count];
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290 wraps = new int [count];
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291 }
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292 int maxX = 0, x = marginLeft + marginWidth, y = marginTop + marginHeight;
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293 for (int i=0; i<count; i++) {
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294 Control child = children [i];
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295 if (pack) {
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296 Point size = computeSize (child, flushCache_);
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297 childWidth = size.x;
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298 childHeight = size.y;
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299 }
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300 if (wrap && (i !is 0) && (x + childWidth > width)) {
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301 wrapped = true;
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302 if (move && (justify || fill || center)) wraps [i - 1] = maxHeight;
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303 x = marginLeft + marginWidth;
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304 y += spacing + maxHeight;
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305 if (pack) maxHeight = 0;
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306 }
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307 if (pack || fill || center) {
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308 maxHeight = Math.max (maxHeight, childHeight);
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309 }
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310 if (move) {
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311 int childX = x + clientX, childY = y + clientY;
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312 if (justify || fill || center) {
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313 bounds [i] = new Rectangle (childX, childY, childWidth, childHeight);
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314 } else {
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315 child.setBounds (childX, childY, childWidth, childHeight);
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316 }
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317 }
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318 x += spacing + childWidth;
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319 maxX = Math.max (maxX, x);
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320 }
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321 maxX = Math.max (clientX + marginLeft + marginWidth, maxX - spacing);
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322 if (!wrapped) maxX += marginRight + marginWidth;
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323 if (move && (justify || fill || center)) {
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324 int space = 0, margin = 0;
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325 if (!wrapped) {
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326 space = Math.max (0, (width - maxX) / (count + 1));
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327 margin = Math.max (0, ((width - maxX) % (count + 1)) / 2);
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328 } else {
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329 if (fill || justify || center) {
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330 int last = 0;
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331 if (count > 0) wraps [count - 1] = maxHeight;
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332 for (int i=0; i<count; i++) {
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333 if (wraps [i] !is 0) {
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334 int wrapCount = i - last + 1;
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335 if (justify) {
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336 int wrapX = 0;
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337 for (int j=last; j<=i; j++) {
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338 wrapX += bounds [j].width + spacing;
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339 }
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340 space = Math.max (0, (width - wrapX) / (wrapCount + 1));
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341 margin = Math.max (0, ((width - wrapX) % (wrapCount + 1)) / 2);
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342 }
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343 for (int j=last; j<=i; j++) {
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344 if (justify) bounds [j].x += (space * (j - last + 1)) + margin;
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345 if (fill) {
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346 bounds [j].height = wraps [i];
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347 } else {
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348 if (center) {
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349 bounds [j].y += Math.max (0, (wraps [i] - bounds [j].height) / 2);
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350 }
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351 }
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352 }
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353 last = i + 1;
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354 }
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355 }
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356 }
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357 }
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358 for (int i=0; i<count; i++) {
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359 if (!wrapped) {
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360 if (justify) bounds [i].x += (space * (i + 1)) + margin;
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361 if (fill) {
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362 bounds [i].height = maxHeight;
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363 } else {
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364 if (center) {
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365 bounds [i].y += Math.max (0, (maxHeight - bounds [i].height) / 2);
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366 }
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367 }
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368 }
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369 children [i].setBounds (bounds [i]);
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370 }
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371 }
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372 return new Point (maxX, y + maxHeight + marginBottom + marginHeight);
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373 }
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374
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375 Point layoutVertical (Composite composite, bool move, bool wrap, int height, bool flushCache_) {
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376 Control [] children = composite.getChildren ();
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377 int count = 0;
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378 for (int i=0; i<children.length; i++) {
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379 Control control = children [i];
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380 RowData data = cast(RowData) control.getLayoutData ();
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381 if (data is null || !data.exclude) {
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382 children [count++] = children [i];
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383 }
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384 }
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385 if (count is 0) {
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386 return new Point (marginLeft + marginWidth * 2 + marginRight, marginTop + marginHeight * 2 + marginBottom);
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387 }
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388 int childWidth = 0, childHeight = 0, maxWidth = 0;
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389 if (!pack) {
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390 for (int i=0; i<count; i++) {
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391 Control child = children [i];
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392 Point size = computeSize (child, flushCache_);
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393 childWidth = Math.max (childWidth, size.x);
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394 childHeight = Math.max (childHeight, size.y);
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395 }
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396 maxWidth = childWidth;
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397 }
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398 int clientX = 0, clientY = 0;
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399 if (move) {
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400 Rectangle rect = composite.getClientArea ();
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401 clientX = rect.x;
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402 clientY = rect.y;
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403 }
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404 int [] wraps = null;
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405 bool wrapped = false;
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406 Rectangle [] bounds = null;
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407 if (move && (justify || fill || center)) {
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408 bounds = new Rectangle [count];
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409 wraps = new int [count];
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410 }
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411 int maxY = 0, x = marginLeft + marginWidth, y = marginTop + marginHeight;
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412 for (int i=0; i<count; i++) {
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413 Control child = children [i];
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414 if (pack) {
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415 Point size = computeSize (child, flushCache_);
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416 childWidth = size.x;
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417 childHeight = size.y;
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418 }
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419 if (wrap && (i !is 0) && (y + childHeight > height)) {
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420 wrapped = true;
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421 if (move && (justify || fill || center)) wraps [i - 1] = maxWidth;
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422 x += spacing + maxWidth;
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423 y = marginTop + marginHeight;
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424 if (pack) maxWidth = 0;
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425 }
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426 if (pack || fill || center) {
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427 maxWidth = Math.max (maxWidth, childWidth);
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428 }
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429 if (move) {
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430 int childX = x + clientX, childY = y + clientY;
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431 if (justify || fill || center) {
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432 bounds [i] = new Rectangle (childX, childY, childWidth, childHeight);
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433 } else {
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434 child.setBounds (childX, childY, childWidth, childHeight);
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435 }
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436 }
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437 y += spacing + childHeight;
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438 maxY = Math.max (maxY, y);
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439 }
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440 maxY = Math.max (clientY + marginTop + marginHeight, maxY - spacing);
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441 if (!wrapped) maxY += marginBottom + marginHeight;
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442 if (move && (justify || fill || center)) {
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443 int space = 0, margin = 0;
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444 if (!wrapped) {
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445 space = Math.max (0, (height - maxY) / (count + 1));
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446 margin = Math.max (0, ((height - maxY) % (count + 1)) / 2);
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447 } else {
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448 if (fill || justify || center) {
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449 int last = 0;
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450 if (count > 0) wraps [count - 1] = maxWidth;
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451 for (int i=0; i<count; i++) {
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452 if (wraps [i] !is 0) {
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453 int wrapCount = i - last + 1;
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454 if (justify) {
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455 int wrapY = 0;
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456 for (int j=last; j<=i; j++) {
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457 wrapY += bounds [j].height + spacing;
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458 }
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459 space = Math.max (0, (height - wrapY) / (wrapCount + 1));
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460 margin = Math.max (0, ((height - wrapY) % (wrapCount + 1)) / 2);
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461 }
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462 for (int j=last; j<=i; j++) {
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463 if (justify) bounds [j].y += (space * (j - last + 1)) + margin;
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464 if (fill) {
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|
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465 bounds [j].width = wraps [i];
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|
|
466 } else {
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|
|
467 if (center) {
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|
|
468 bounds [j].x += Math.max (0, (wraps [i] - bounds [j].width) / 2);
|
|
|
469 }
|
|
|
470 }
|
|
|
471 }
|
|
|
472 last = i + 1;
|
|
|
473 }
|
|
|
474 }
|
|
|
475 }
|
|
|
476 }
|
|
|
477 for (int i=0; i<count; i++) {
|
|
|
478 if (!wrapped) {
|
|
|
479 if (justify) bounds [i].y += (space * (i + 1)) + margin;
|
|
|
480 if (fill) {
|
|
|
481 bounds [i].width = maxWidth;
|
|
|
482 } else {
|
|
|
483 if (center) {
|
|
|
484 bounds [i].x += Math.max (0, (maxWidth - bounds [i].width) / 2);
|
|
|
485 }
|
|
|
486 }
|
|
|
487
|
|
|
488 }
|
|
|
489 children [i].setBounds (bounds [i]);
|
|
|
490 }
|
|
|
491 }
|
|
|
492 return new Point (x + maxWidth + marginRight + marginWidth, maxY);
|
|
|
493 }
|
|
|
494
|
|
|
495 /**
|
|
|
496 * Returns a string containing a concise, human-readable
|
|
|
497 * description of the receiver.
|
|
|
498 *
|
|
|
499 * @return a string representation of the layout
|
|
|
500 */
|
|
|
501 override public String toString () {
|
|
|
502 String string = getName ()~" {";
|
|
|
503 string ~= "type="~((type !is SWT.HORIZONTAL) ? "SWT.VERTICAL" : "SWT.HORIZONTAL")~" ";
|
|
|
504 if (marginWidth !is 0) string ~= "marginWidth="~to!(String)(marginWidth)~" ";
|
|
|
505 if (marginHeight !is 0) string ~= "marginHeight="~to!(String)(marginHeight)~" ";
|
|
|
506 if (marginLeft !is 0) string ~= "marginLeft="~to!(String)(marginLeft)~" ";
|
|
|
507 if (marginTop !is 0) string ~= "marginTop="~to!(String)(marginTop)~" ";
|
|
|
508 if (marginRight !is 0) string ~= "marginRight="~to!(String)(marginRight)~" ";
|
|
|
509 if (marginBottom !is 0) string ~= "marginBottom="~to!(String)(marginBottom)~" ";
|
|
|
510 if (spacing !is 0) string ~= "spacing="~to!(String)(spacing)~" ";
|
|
|
511 string ~= "wrap="~to!(String)(wrap)~" ";
|
|
|
512 string ~= "pack="~to!(String)(pack)~" ";
|
|
|
513 string ~= "fill="~to!(String)(fill)~" ";
|
|
|
514 string ~= "justify="~to!(String)(justify)~" ";
|
|
|
515 string = string.trim();
|
|
|
516 string ~= "}";
|
|
|
517 return string;
|
|
|
518 }
|
|
|
519 }
|
