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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2007 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.custom.ControlEditor;
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12
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13
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14
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15 import dwt.DWT;
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16 import dwt.graphics.Rectangle;
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17 import dwt.widgets.Composite;
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18 import dwt.widgets.Control;
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19 import dwt.widgets.Event;
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20 import dwt.widgets.Listener;
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21 import dwt.widgets.ScrollBar;
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22
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23 /**
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24 *
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25 * A ControlEditor is a manager for a Control that appears above a composite and tracks with the
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26 * moving and resizing of that composite. It can be used to display one control above
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27 * another control. This could be used when editing a control that does not have editing
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28 * capabilities by using a text editor or for launching a dialog by placing a button
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29 * above a control.
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30 *
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31 * <p> Here is an example of using a ControlEditor:
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32 *
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33 * <code><pre>
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34 * Canvas canvas = new Canvas(shell, DWT.BORDER);
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35 * canvas.setBounds(10, 10, 300, 300);
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36 * Color color = new Color(null, 255, 0, 0);
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37 * canvas.setBackground(color);
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38 * ControlEditor editor = new ControlEditor (canvas);
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39 * // The editor will be a button in the bottom right corner of the canvas.
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40 * // When selected, it will launch a Color dialog that will change the background
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41 * // of the canvas.
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42 * Button button = new Button(canvas, DWT.PUSH);
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43 * button.setText("Select Color...");
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44 * button.addSelectionListener (new SelectionAdapter() {
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45 * public void widgetSelected(SelectionEvent e) {
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46 * ColorDialog dialog = new ColorDialog(shell);
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47 * dialog.open();
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48 * RGB rgb = dialog.getRGB();
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49 * if (rgb !is null) {
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50 * if (color !is null) color.dispose();
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51 * color = new Color(null, rgb);
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52 * canvas.setBackground(color);
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53 * }
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54 *
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55 * }
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56 * });
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57 *
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58 * editor.horizontalAlignment = DWT.RIGHT;
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59 * editor.verticalAlignment = DWT.BOTTOM;
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60 * editor.grabHorizontal = false;
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61 * editor.grabVertical = false;
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62 * Point size = button.computeSize(DWT.DEFAULT, DWT.DEFAULT);
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63 * editor.minimumWidth = size.x;
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64 * editor.minimumHeight = size.y;
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65 * editor.setEditor (button);
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66 * </pre></code>
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67 */
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68 public class ControlEditor {
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69
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70 /**
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71 * Specifies how the editor should be aligned relative to the control. Allowed values
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72 * are DWT.LEFT, DWT.RIGHT and DWT.CENTER. The default value is DWT.CENTER.
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73 */
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74 public int horizontalAlignment = DWT.CENTER;
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75
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76 /**
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77 * Specifies whether the editor should be sized to use the entire width of the control.
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78 * True means resize the editor to the same width as the cell. False means do not adjust
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79 * the width of the editor. The default value is false.
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80 */
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81 public bool grabHorizontal = false;
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82
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83 /**
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84 * Specifies the minimum width the editor can have. This is used in association with
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85 * a true value of grabHorizontal. If the cell becomes smaller than the minimumWidth, the
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86 * editor will not made smaller than the minimum width value. The default value is 0.
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87 */
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88 public int minimumWidth = 0;
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89
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90 /**
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91 * Specifies how the editor should be aligned relative to the control. Allowed values
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92 * are DWT.TOP, DWT.BOTTOM and DWT.CENTER. The default value is DWT.CENTER.
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93 */
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94 public int verticalAlignment = DWT.CENTER;
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95
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96 /**
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97 * Specifies whether the editor should be sized to use the entire height of the control.
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98 * True means resize the editor to the same height as the underlying control. False means do not adjust
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99 * the height of the editor. The default value is false.
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100 */
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101 public bool grabVertical = false;
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102
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103 /**
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104 * Specifies the minimum height the editor can have. This is used in association with
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105 * a true value of grabVertical. If the control becomes smaller than the minimumHeight, the
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106 * editor will not made smaller than the minimum height value. The default value is 0.
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107 */
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108 public int minimumHeight = 0;
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109
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110 Composite parent;
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111 Control editor;
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112 private bool hadFocus;
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113 private Listener controlListener;
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114 private Listener scrollbarListener;
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115
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116 private final static int [] EVENTS = [DWT.KeyDown, DWT.KeyUp, DWT.MouseDown, DWT.MouseUp, DWT.Resize];
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117 /**
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118 * Creates a ControlEditor for the specified Composite.
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119 *
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120 * @param parent the Composite above which this editor will be displayed
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121 *
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122 */
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123 public this (Composite parent) {
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124 this.parent = parent;
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125
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126 controlListener = new class() Listener {
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127 public void handleEvent(Event e) {
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128 layout ();
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129 }
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130 };
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131 for (int i=0; i<EVENTS.length; i++) {
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132 parent.addListener (EVENTS [i], controlListener);
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133 }
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134
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135 scrollbarListener = new class() Listener {
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136 public void handleEvent(Event e) {
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137 scroll (e);
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138 }
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139 };
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140 ScrollBar hBar = parent.getHorizontalBar ();
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141 if (hBar !is null) hBar.addListener (DWT.Selection, scrollbarListener);
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142 ScrollBar vBar = parent.getVerticalBar ();
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143 if (vBar !is null) vBar.addListener (DWT.Selection, scrollbarListener);
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144 }
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145 Rectangle computeBounds () {
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146 Rectangle clientArea = parent.getClientArea();
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147 Rectangle editorRect = new Rectangle(clientArea.x, clientArea.y, minimumWidth, minimumHeight);
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148
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149 if (grabHorizontal)
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150 editorRect.width = Math.max(clientArea.width, minimumWidth);
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151
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152 if (grabVertical)
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153 editorRect.height = Math.max(clientArea.height, minimumHeight);
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154
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155 switch (horizontalAlignment) {
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156 case DWT.RIGHT:
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157 editorRect.x += clientArea.width - editorRect.width;
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158 break;
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159 case DWT.LEFT:
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160 // do nothing - clientArea.x is the right answer
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161 break;
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162 default:
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163 // default is CENTER
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164 editorRect.x += (clientArea.width - editorRect.width)/2;
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165 }
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166
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167 switch (verticalAlignment) {
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168 case DWT.BOTTOM:
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169 editorRect.y += clientArea.height - editorRect.height;
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170 break;
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171 case DWT.TOP:
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172 // do nothing - clientArea.y is the right answer
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173 break;
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174 default :
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175 // default is CENTER
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176 editorRect.y += (clientArea.height - editorRect.height)/2;
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177 }
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178
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179
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180 return editorRect;
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181
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182 }
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183 /**
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184 * Removes all associations between the Editor and the underlying composite. The
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185 * composite and the editor Control are <b>not</b> disposed.
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186 */
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187 public void dispose () {
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188 if (parent !is null && !parent.isDisposed()) {
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189 for (int i=0; i<EVENTS.length; i++) {
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190 parent.removeListener (EVENTS [i], controlListener);
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191 }
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192 ScrollBar hBar = parent.getHorizontalBar ();
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193 if (hBar !is null) hBar.removeListener (DWT.Selection, scrollbarListener);
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194 ScrollBar vBar = parent.getVerticalBar ();
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195 if (vBar !is null) vBar.removeListener (DWT.Selection, scrollbarListener);
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196 }
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197
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198 parent = null;
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199 editor = null;
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200 hadFocus = false;
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201 controlListener = null;
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202 scrollbarListener = null;
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203 }
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204 /**
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205 * Returns the Control that is displayed above the composite being edited.
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206 *
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207 * @return the Control that is displayed above the composite being edited
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208 */
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209 public Control getEditor () {
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210 return editor;
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211 }
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212 /**
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213 * Lays out the control within the underlying composite. This
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214 * method should be called after changing one or more fields to
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215 * force the Editor to resize.
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216 *
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217 * @since 2.1
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218 */
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219 public void layout () {
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220 if (editor is null || editor.isDisposed()) return;
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221 if (editor.getVisible ()) {
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222 hadFocus = editor.isFocusControl();
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223 } // this doesn't work because
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224 // resizing the column takes the focus away
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225 // before we get here
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226 editor.setBounds (computeBounds ());
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227 if (hadFocus) {
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228 if (editor is null || editor.isDisposed()) return;
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229 editor.setFocus ();
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230 }
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231 }
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232 void scroll (Event e) {
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233 if (editor is null || editor.isDisposed()) return;
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234 layout();
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235 }
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236 /**
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237 * Specify the Control that is to be displayed.
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238 *
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239 * <p>Note: The Control provided as the editor <b>must</b> be created with its parent
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240 * being the Composite specified in the ControlEditor constructor.
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241 *
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242 * @param editor the Control that is displayed above the composite being edited
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243 */
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244 public void setEditor (Control editor) {
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245
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246 if (editor is null) {
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247 // this is the case where the caller is setting the editor to be blank
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248 // set all the values accordingly
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249 this.editor = null;
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250 return;
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251 }
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252
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253 this.editor = editor;
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254 layout();
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255 if (this.editor is null || this.editor.isDisposed()) return;
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256 editor.setVisible(true);
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257 }
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258 }
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