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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 * 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 dwt.layout.FormData;
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14
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15
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16 import dwt.DWT;
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17 import dwt.graphics.Point;
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18 import dwt.widgets.Control;
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19 import dwt.layout.FormAttachment;
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20 import tango.text.Util;
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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 * Instances of this class are used to define the attachments
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27 * of a control in a <code>FormLayout</code>.
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28 * <p>
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29 * To set a <code>FormData</code> object into a control, you use the
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30 * <code>setLayoutData ()</code> method. To define attachments for the
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31 * <code>FormData</code>, set the fields directly, like this:
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32 * <pre>
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33 * FormData data = new FormData();
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34 * data.left = new FormAttachment(0,5);
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35 * data.right = new FormAttachment(100,-5);
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36 * button.setLayoutData(formData);
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37 * </pre>
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38 * </p>
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39 * <p>
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40 * <code>FormData</code> contains the <code>FormAttachments</code> for
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41 * each edge of the control that the <code>FormLayout</code> uses to
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42 * determine the size and position of the control. <code>FormData</code>
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43 * objects also allow you to set the width and height of controls within
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44 * a <code>FormLayout</code>.
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45 * </p>
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46 *
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47 * @see FormLayout
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48 * @see FormAttachment
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49 *
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50 * @since 2.0
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51 */
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52 public final class FormData {
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53 /**
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54 * width specifies the preferred width in pixels. This value
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55 * is the wHint passed into Control.computeSize(int, int, bool)
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56 * to determine the preferred size of the control.
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57 *
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58 * The default value is DWT.DEFAULT.
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59 *
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60 * @see Control#computeSize(int, int, bool)
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61 */
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62 public int width = DWT.DEFAULT;
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63 /**
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64 * height specifies the preferred height in pixels. This value
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65 * is the hHint passed into Control.computeSize(int, int, bool)
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66 * to determine the preferred size of the control.
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67 *
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68 * The default value is DWT.DEFAULT.
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69 *
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70 * @see Control#computeSize(int, int, bool)
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71 */
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72 public int height = DWT.DEFAULT;
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73 /**
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74 * left specifies the attachment of the left side of
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75 * the control.
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76 */
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77 public FormAttachment left;
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78 /**
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79 * right specifies the attachment of the right side of
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80 * the control.
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81 */
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82 public FormAttachment right;
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83 /**
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84 * top specifies the attachment of the top of the control.
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85 */
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86 public FormAttachment top;
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87 /**
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88 * bottom specifies the attachment of the bottom of the
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89 * control.
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90 */
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91 public FormAttachment bottom;
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92
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93 int cacheWidth = -1, cacheHeight = -1;
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94 int defaultWhint, defaultHhint, defaultWidth = -1, defaultHeight = -1;
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95 int currentWhint, currentHhint, currentWidth = -1, currentHeight = -1;
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96 FormAttachment cacheLeft, cacheRight, cacheTop, cacheBottom;
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97 bool isVisited, needed;
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98
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99 /**
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100 * Constructs a new instance of FormData using
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101 * default values.
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102 */
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103 public this () {
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104 }
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105
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106 /**
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107 * Constructs a new instance of FormData according to the parameters.
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108 * A value of DWT.DEFAULT indicates that no minimum width or
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109 * no minimum height is specified.
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110 *
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111 * @param width a minimum width for the control
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112 * @param height a minimum height for the control
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113 */
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114 public this (int width, int height) {
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115 this.width = width;
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116 this.height = height;
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117 }
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118
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119 void computeSize (Control control, int wHint, int hHint, bool flushCache_) {
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120 if (cacheWidth !is -1 && cacheHeight !is -1) return;
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121 if (wHint is this.width && hHint is this.height) {
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122 if (defaultWidth is -1 || defaultHeight is -1 || wHint !is defaultWhint || hHint !is defaultHhint) {
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123 Point size = control.computeSize (wHint, hHint, flushCache_);
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124 defaultWhint = wHint;
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125 defaultHhint = hHint;
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126 defaultWidth = size.x;
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127 defaultHeight = size.y;
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128 }
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129 cacheWidth = defaultWidth;
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130 cacheHeight = defaultHeight;
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131 return;
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132 }
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133 if (currentWidth is -1 || currentHeight is -1 || wHint !is currentWhint || hHint !is currentHhint) {
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134 Point size = control.computeSize (wHint, hHint, flushCache_);
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135 currentWhint = wHint;
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136 currentHhint = hHint;
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137 currentWidth = size.x;
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138 currentHeight = size.y;
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139 }
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140 cacheWidth = currentWidth;
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141 cacheHeight = currentHeight;
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142 }
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143
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144 void flushCache () {
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145 cacheWidth = cacheHeight = -1;
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146 defaultHeight = defaultWidth = -1;
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147 currentHeight = currentWidth = -1;
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148 }
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149
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150 int getWidth (Control control, bool flushCache) {
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151 needed = true;
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152 computeSize (control, width, height, flushCache);
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153 return cacheWidth;
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154 }
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155
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156 int getHeight (Control control, bool flushCache) {
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157 computeSize (control, width, height, flushCache);
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158 return cacheHeight;
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159 }
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160
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161 FormAttachment getBottomAttachment (Control control, int spacing, bool flushCache) {
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162 if (cacheBottom !is null) return cacheBottom;
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163 if (isVisited) return cacheBottom = new FormAttachment (0, getHeight (control, flushCache));
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164 if (bottom is null) {
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165 if (top is null) return cacheBottom = new FormAttachment (0, getHeight (control, flushCache));
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166 return cacheBottom = getTopAttachment (control, spacing, flushCache).plus (getHeight (control, flushCache));
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167 }
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168 Control bottomControl = bottom.control;
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169 if (bottomControl !is null) {
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170 if (bottomControl.isDisposed ()) {
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171 bottom.control = bottomControl = null;
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172 } else {
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173 if (bottomControl.getParent () !is control.getParent ()) {
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174 bottomControl = null;
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175 }
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176 }
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177 }
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178 if (bottomControl is null) return cacheBottom = bottom;
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179 isVisited = true;
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180 FormData bottomData = cast(FormData) bottomControl.getLayoutData ();
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181 FormAttachment bottomAttachment = bottomData.getBottomAttachment (bottomControl, spacing, flushCache);
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182 switch (bottom.alignment) {
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183 case DWT.BOTTOM:
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184 cacheBottom = bottomAttachment.plus (bottom.offset);
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185 break;
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186 case DWT.CENTER: {
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187 FormAttachment topAttachment = bottomData.getTopAttachment (bottomControl, spacing, flushCache);
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188 FormAttachment bottomHeight = bottomAttachment.minus (topAttachment);
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189 cacheBottom = bottomAttachment.minus (bottomHeight.minus (getHeight (control, flushCache)).divide (2));
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190 break;
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191 }
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192 default: {
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193 FormAttachment topAttachment = bottomData.getTopAttachment (bottomControl, spacing, flushCache);
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194 cacheBottom = topAttachment.plus (bottom.offset - spacing);
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195 break;
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196 }
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197 }
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198 isVisited = false;
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199 return cacheBottom;
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200 }
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201
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202 FormAttachment getLeftAttachment (Control control, int spacing, bool flushCache) {
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203 if (cacheLeft !is null) return cacheLeft;
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204 if (isVisited) return cacheLeft = new FormAttachment (0, 0);
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205 if (left is null) {
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206 if (right is null) return cacheLeft = new FormAttachment (0, 0);
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207 return cacheLeft = getRightAttachment (control, spacing, flushCache).minus (getWidth (control, flushCache));
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208 }
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209 Control leftControl = left.control;
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210 if (leftControl !is null) {
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211 if (leftControl.isDisposed ()) {
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212 left.control = leftControl = null;
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213 } else {
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214 if (leftControl.getParent () !is control.getParent ()) {
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215 leftControl = null;
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216 }
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217 }
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218 }
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219 if (leftControl is null) return cacheLeft = left;
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220 isVisited = true;
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221 FormData leftData = cast(FormData) leftControl.getLayoutData ();
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222 FormAttachment leftAttachment = leftData.getLeftAttachment (leftControl, spacing, flushCache);
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223 switch (left.alignment) {
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224 case DWT.LEFT:
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225 cacheLeft = leftAttachment.plus (left.offset);
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226 break;
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227 case DWT.CENTER: {
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228 FormAttachment rightAttachment = leftData.getRightAttachment (leftControl, spacing, flushCache);
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229 FormAttachment leftWidth = rightAttachment.minus (leftAttachment);
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230 cacheLeft = leftAttachment.plus (leftWidth.minus (getWidth (control, flushCache)).divide (2));
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231 break;
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232 }
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233 default: {
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234 FormAttachment rightAttachment = leftData.getRightAttachment (leftControl, spacing, flushCache);
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235 cacheLeft = rightAttachment.plus (left.offset + spacing);
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236 }
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237 }
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238 isVisited = false;
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239 return cacheLeft;
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240 }
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241
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242 char[] getName () {
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243 char[] string = this.classinfo.name;
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244 int index = locatePrior( string, '.');
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245 if (index is string.length ) return string;
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246 return string[ index + 1 .. string.length ];
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247 }
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248
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249 FormAttachment getRightAttachment (Control control, int spacing, bool flushCache) {
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250 if (cacheRight !is null) return cacheRight;
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251 if (isVisited) return cacheRight = new FormAttachment (0, getWidth (control, flushCache));
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252 if (right is null) {
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253 if (left is null) return cacheRight = new FormAttachment (0, getWidth (control, flushCache));
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254 return cacheRight = getLeftAttachment (control, spacing, flushCache).plus (getWidth (control, flushCache));
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255 }
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256 Control rightControl = right.control;
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257 if (rightControl !is null) {
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258 if (rightControl.isDisposed ()) {
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259 right.control = rightControl = null;
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260 } else {
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261 if (rightControl.getParent () !is control.getParent ()) {
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262 rightControl = null;
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263 }
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264 }
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265 }
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266 if (rightControl is null) return cacheRight = right;
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267 isVisited = true;
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268 FormData rightData = cast(FormData) rightControl.getLayoutData ();
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269 FormAttachment rightAttachment = rightData.getRightAttachment (rightControl, spacing, flushCache);
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270 switch (right.alignment) {
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271 case DWT.RIGHT:
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272 cacheRight = rightAttachment.plus (right.offset);
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273 break;
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274 case DWT.CENTER: {
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275 FormAttachment leftAttachment = rightData.getLeftAttachment (rightControl, spacing, flushCache);
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276 FormAttachment rightWidth = rightAttachment.minus (leftAttachment);
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277 cacheRight = rightAttachment.minus (rightWidth.minus (getWidth (control, flushCache)).divide (2));
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278 break;
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279 }
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280 default: {
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281 FormAttachment leftAttachment = rightData.getLeftAttachment (rightControl, spacing, flushCache);
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282 cacheRight = leftAttachment.plus (right.offset - spacing);
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283 break;
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284 }
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285 }
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286 isVisited = false;
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287 return cacheRight;
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288 }
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289
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290 FormAttachment getTopAttachment (Control control, int spacing, bool flushCache) {
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291 if (cacheTop !is null) return cacheTop;
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292 if (isVisited) return cacheTop = new FormAttachment (0, 0);
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293 if (top is null) {
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294 if (bottom is null) return cacheTop = new FormAttachment (0, 0);
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295 return cacheTop = getBottomAttachment (control, spacing, flushCache).minus (getHeight (control, flushCache));
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296 }
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297 Control topControl = top.control;
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298 if (topControl !is null) {
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299 if (topControl.isDisposed ()) {
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300 top.control = topControl = null;
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301 } else {
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302 if (topControl.getParent () !is control.getParent ()) {
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303 topControl = null;
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304 }
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305 }
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306 }
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307 if (topControl is null) return cacheTop = top;
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308 isVisited = true;
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309 FormData topData = cast(FormData) topControl.getLayoutData ();
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310 FormAttachment topAttachment = topData.getTopAttachment (topControl, spacing, flushCache);
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311 switch (top.alignment) {
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312 case DWT.TOP:
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313 cacheTop = topAttachment.plus (top.offset);
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314 break;
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315 case DWT.CENTER: {
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316 FormAttachment bottomAttachment = topData.getBottomAttachment (topControl, spacing, flushCache);
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317 FormAttachment topHeight = bottomAttachment.minus (topAttachment);
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318 cacheTop = topAttachment.plus (topHeight.minus (getHeight (control, flushCache)).divide (2));
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319 break;
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320 }
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321 default: {
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322 FormAttachment bottomAttachment = topData.getBottomAttachment (topControl, spacing, flushCache);
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323 cacheTop = bottomAttachment.plus (top.offset + spacing);
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324 break;
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325 }
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326 }
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327 isVisited = false;
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328 return cacheTop;
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329 }
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330
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331 /**
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332 * Returns a string containing a concise, human-readable
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333 * description of the receiver.
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334 *
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335 * @return a string representation of the FormData object
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336 */
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337 public char[] toString () {
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338 char[] string = getName()~" {";
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339 if (width !is DWT.DEFAULT) string ~= "width="~to!(char[])(width)~" ";
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340 if (height !is DWT.DEFAULT) string ~= "height="~to!(char[])(height)~" ";
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341 if (left !is null) string ~= "left="~to!(char[])(left)~" ";
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342 if (right !is null) string ~= "right="~to!(char[])(right)~" ";
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343 if (top !is null) string ~= "top="~to!(char[])(top)~" ";
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344 if (bottom !is null) string ~= "bottom="~to!(char[])(bottom)~" ";
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345 string = trim( string );
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346 string ~= "}";
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347 return string;
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348 }
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349
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350 }
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