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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *******************************************************************************/
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11 module dwt.layout.FillLayout;
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12
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13 import dwt.SWT;
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14 import dwt.graphics.Point;
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15 import dwt.graphics.Rectangle;
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16 import dwt.widgets.Control;
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17 import dwt.widgets.Layout;
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18 import dwt.widgets.Composite;
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19 import dwt.widgets.Scrollable;
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20 import dwt.layout.FillData;
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21
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22 import tango.text.Util;
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23 import tango.util.Convert;
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24
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25 /**
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26 * <code>FillLayout</code> is the simplest layout class. It lays out
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27 * controls in a single row or column, forcing them to be the same size.
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28 * <p>
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29 * Initially, the controls will all be as tall as the tallest control,
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30 * and as wide as the widest. <code>FillLayout</code> does not wrap,
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31 * but you can specify margins and spacing. You might use it to
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32 * lay out buttons in a task bar or tool bar, or to stack checkboxes
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33 * in a <code>Group</code>. <code>FillLayout</code> can also be used
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34 * when a <code>Composite</code> only has one child. For example,
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35 * if a <code>Shell</code> has a single <code>Group</code> child,
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36 * <code>FillLayout</code> will cause the <code>Group</code> to
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37 * completely fill the <code>Shell</code> (if margins are 0).
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38 * </p>
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39 * <p>
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40 * Example code: first a <code>FillLayout</code> is created and
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41 * its type field is set, and then the layout is set into the
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42 * <code>Composite</code>. Note that in a <code>FillLayout</code>,
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43 * children are always the same size, and they fill all available space.
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44 * <pre>
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45 * FillLayout fillLayout = new FillLayout();
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46 * fillLayout.type = SWT.VERTICAL;
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47 * shell.setLayout(fillLayout);
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48 * </pre>
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49 * </p>
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50 */
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51 public final class FillLayout : Layout {
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52 /**
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53 * type specifies how controls will be positioned
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54 * within the layout.
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55 *
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56 * The default value is HORIZONTAL.
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57 *
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58 * Possible values are: <ul>
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59 * <li>HORIZONTAL: Position the controls horizontally from left to right</li>
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60 * <li>VERTICAL: Position the controls vertically from top to bottom</li>
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61 * </ul>
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62 */
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63 public int type = SWT.HORIZONTAL;
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64
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65 /**
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66 * marginWidth specifies the number of pixels of horizontal margin
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67 * that will be placed along the left and right edges of the layout.
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68 *
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69 * The default value is 0.
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70 *
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71 * @since 3.0
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72 */
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73 public int marginWidth = 0;
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74
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75 /**
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76 * marginHeight specifies the number of pixels of vertical margin
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77 * that will be placed along the top and bottom edges of the layout.
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78 *
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79 * The default value is 0.
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80 *
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81 * @since 3.0
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82 */
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83 public int marginHeight = 0;
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84
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85 /**
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86 * spacing specifies the number of pixels between the edge of one cell
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87 * and the edge of its neighbouring cell.
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88 *
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89 * The default value is 0.
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90 *
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91 * @since 3.0
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92 */
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93 public int spacing = 0;
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94
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95 /**
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96 * Constructs a new instance of this class.
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97 */
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98 public this () {
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99 }
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100
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101 /**
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102 * Constructs a new instance of this class given the type.
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103 *
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104 * @param type the type of fill layout
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105 *
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106 * @since 2.0
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107 */
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108 public this (int type) {
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109 this.type = type;
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110 }
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111
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112 protected Point computeSize (Composite composite, int wHint, int hHint, bool flushCache) {
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113 Control [] children = composite.getChildren ();
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114 int count = children.length;
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115 int maxWidth = 0, maxHeight = 0;
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116 for (int i=0; i<count; i++) {
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117 Control child = children [i];
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118 int w = wHint, h = hHint;
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119 if (count > 0) {
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120 if (type is SWT.HORIZONTAL && wHint !is SWT.DEFAULT) {
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121 w = Math.max (0, (wHint - (count - 1) * spacing) / count);
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122 }
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123 if (type is SWT.VERTICAL && hHint !is SWT.DEFAULT) {
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124 h = Math.max (0, (hHint - (count - 1) * spacing) / count);
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125 }
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126 }
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127 Point size = computeChildSize (child, w, h, flushCache);
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128 maxWidth = Math.max (maxWidth, size.x);
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129 maxHeight = Math.max (maxHeight, size.y);
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130 }
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131 int width = 0, height = 0;
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132 if (type is SWT.HORIZONTAL) {
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133 width = count * maxWidth;
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134 if (count !is 0) width += (count - 1) * spacing;
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135 height = maxHeight;
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136 } else {
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137 width = maxWidth;
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138 height = count * maxHeight;
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139 if (count !is 0) height += (count - 1) * spacing;
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140 }
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141 width += marginWidth * 2;
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142 height += marginHeight * 2;
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143 if (wHint !is SWT.DEFAULT) width = wHint;
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144 if (hHint !is SWT.DEFAULT) height = hHint;
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145 return new Point (width, height);
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146 }
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147
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148 Point computeChildSize (Control control, int wHint, int hHint, bool flushCache) {
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149 FillData data = cast(FillData)control.getLayoutData ();
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150 if (data is null) {
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151 data = new FillData ();
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152 control.setLayoutData (data);
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153 }
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154 Point size = null;
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155 if (wHint is SWT.DEFAULT && hHint is SWT.DEFAULT) {
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156 size = data.computeSize (control, wHint, hHint, flushCache);
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157 } else {
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158 // TEMPORARY CODE
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159 int trimX, trimY;
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160 if ( auto sa = cast(Scrollable)control ) {
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161 Rectangle rect = sa.computeTrim (0, 0, 0, 0);
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162 trimX = rect.width;
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163 trimY = rect.height;
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164 } else {
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165 trimX = trimY = control.getBorderWidth () * 2;
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166 }
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167 int w = wHint is SWT.DEFAULT ? wHint : Math.max (0, wHint - trimX);
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168 int h = hHint is SWT.DEFAULT ? hHint : Math.max (0, hHint - trimY);
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169 size = data.computeSize (control, w, h, flushCache);
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170 }
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171 return size;
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172 }
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173
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174 protected bool flushCache (Control control) {
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175 Object data = control.getLayoutData();
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176 if (data !is null) (cast(FillData)data).flushCache();
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177 return true;
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178 }
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179
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180 char[] getName () {
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181 char[] string = this.classinfo.name;
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182 int index = locatePrior( string, '.');
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183 if (index is string.length ) return string;
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184 return string[ index + 1 .. string.length ];
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185 }
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186
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187 protected void layout (Composite composite, bool flushCache) {
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188 Rectangle rect = composite.getClientArea ();
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189 Control [] children = composite.getChildren ();
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190 int count = children.length;
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191 if (count is 0) return;
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192 int width = rect.width - marginWidth * 2;
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193 int height = rect.height - marginHeight * 2;
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194 if (type is SWT.HORIZONTAL) {
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195 width -= (count - 1) * spacing;
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196 int x = rect.x + marginWidth, extra = width % count;
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197 int y = rect.y + marginHeight, cellWidth = width / count;
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198 for (int i=0; i<count; i++) {
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199 Control child = children [i];
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200 int childWidth = cellWidth;
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201 if (i is 0) {
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202 childWidth += extra / 2;
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203 } else {
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204 if (i is count - 1) childWidth += (extra + 1) / 2;
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205 }
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206 child.setBounds (x, y, childWidth, height);
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207 x += childWidth + spacing;
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208 }
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209 } else {
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210 height -= (count - 1) * spacing;
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211 int x = rect.x + marginWidth, cellHeight = height / count;
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212 int y = rect.y + marginHeight, extra = height % count;
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213 for (int i=0; i<count; i++) {
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214 Control child = children [i];
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215 int childHeight = cellHeight;
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216 if (i is 0) {
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217 childHeight += extra / 2;
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218 } else {
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219 if (i is count - 1) childHeight += (extra + 1) / 2;
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220 }
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221 child.setBounds (x, y, width, childHeight);
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222 y += childHeight + spacing;
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223 }
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224 }
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225 }
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226
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227 /**
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228 * Returns a string containing a concise, human-readable
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229 * description of the receiver.
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230 *
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231 * @return a string representation of the layout
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232 */
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233 public char[] toString () {
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234 char[] string = getName () ~ " {";
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235 string ~= "type="~((type is SWT.VERTICAL) ? "SWT.VERTICAL" : "SWT.HORIZONTAL")~" ";
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236 if (marginWidth !is 0) string ~= "marginWidth="~to!(char[])(marginWidth)~" ";
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237 if (marginHeight !is 0) string ~= "marginHeight="~to!(char[])(marginHeight)~" ";
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238 if (spacing !is 0) string ~= "spacing="~to!(char[])(spacing)~" ";
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239 string = trim( string );
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240 string ~= "}";
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241 return string;
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242 }
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243 }
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