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1 /*******************************************************************************
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2 * Copyright (c) 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 dwtx.jface.internal.text.InformationControlReplacer;
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14
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15 import dwt.dwthelper.utils;
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16
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17
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18
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19 import dwt.graphics.Point;
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20 import dwt.graphics.Rectangle;
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21 import dwt.widgets.Shell;
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22 import dwtx.jface.text.AbstractInformationControlManager;
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23 import dwtx.jface.text.AbstractReusableInformationControlCreator;
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24 import dwtx.jface.text.DefaultInformationControl;
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25 import dwtx.jface.text.IInformationControl;
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26 import dwtx.jface.text.IInformationControlCreator;
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27 import dwtx.jface.text.IInformationControlExtension2;
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28 import dwtx.jface.text.IInformationControlExtension3;
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29 import dwtx.jface.util.Geometry;
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30
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31
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32 /**
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33 * An information control replacer can replace an
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34 * {@link AbstractInformationControlManager}'s control.
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35 *
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36 * @see AbstractInformationControlManager#setInformationControlReplacer(InformationControlReplacer)
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37 * @since 3.4
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38 */
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39 public class InformationControlReplacer : AbstractInformationControlManager {
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40
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41 /**
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42 * Minimal width in pixels.
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43 */
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44 private static final int MIN_WIDTH= 80;
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45 /**
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46 * Minimal height in pixels.
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47 */
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48 private static final int MIN_HEIGHT= 50;
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49
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50 /**
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51 * Default control creator.
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52 */
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53 protected static class DefaultInformationControlCreator : AbstractReusableInformationControlCreator {
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54 public IInformationControl doCreateInformationControl(Shell shell) {
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55 return new DefaultInformationControl(shell, true);
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56 }
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57 }
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58
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59 private bool fIsReplacing;
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60 private Object fReplacableInformation;
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61 private bool fDelayedInformationSet;
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62 private Rectangle fReplaceableArea;
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63 private Rectangle fContentBounds;
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64
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65
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66 /**
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67 * Creates a new information control replacer.
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68 *
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69 * @param creator the default information control creator
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70 */
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71 public InformationControlReplacer(IInformationControlCreator creator) {
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72 super(creator);
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73 takesFocusWhenVisible(false);
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74 }
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75
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76 /**
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77 * Replace the information control.
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78 *
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79 * @param informationPresenterControlCreator the information presenter control creator
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80 * @param contentBounds the bounds of the content area of the information control
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81 * @param information the information to show
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82 * @param subjectArea the subject area
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83 * @param takeFocus <code>true</code> iff the replacing information control should take focus
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84 */
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85 public void replaceInformationControl(IInformationControlCreator informationPresenterControlCreator, Rectangle contentBounds, Object information, final Rectangle subjectArea, bool takeFocus) {
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86
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87 try {
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88 fIsReplacing= true;
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89 if (! fDelayedInformationSet)
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90 fReplacableInformation= information;
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91 else
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92 takeFocus= true; // delayed input has been set, so the original info control must have been focused
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93 fContentBounds= contentBounds;
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94 fReplaceableArea= subjectArea;
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95
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96 setCustomInformationControlCreator(informationPresenterControlCreator);
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97
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98 takesFocusWhenVisible(takeFocus);
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99
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100 showInformation();
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101 } finally {
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102 fIsReplacing= false;
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103 fReplacableInformation= null;
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104 fDelayedInformationSet= false;
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105 fReplaceableArea= null;
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106 setCustomInformationControlCreator(null);
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107 }
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108 }
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109
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110 /*
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111 * @see dwtx.jface.text.AbstractInformationControlManager#computeInformation()
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112 */
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113 protected void computeInformation() {
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114 if (fIsReplacing && fReplacableInformation !is null) {
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115 setInformation(fReplacableInformation, fReplaceableArea);
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116 return;
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117 }
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118
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119 if (DEBUG)
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120 System.out.println("InformationControlReplacer: no active replaceable"); //$NON-NLS-1$
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121 }
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122
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123 /**
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124 * Opens the information control with the given information and the specified
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125 * subject area. It also activates the information control closer.
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126 *
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127 * @param subjectArea the information area
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128 * @param information the information
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129 */
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130 public void showInformationControl(Rectangle subjectArea, Object information) {
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131 IInformationControl informationControl= getInformationControl();
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132
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133 Rectangle controlBounds= fContentBounds;
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134 if (informationControl instanceof IInformationControlExtension3) {
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135 IInformationControlExtension3 iControl3= (IInformationControlExtension3) informationControl;
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136 Rectangle trim= iControl3.computeTrim();
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137 controlBounds= Geometry.add(controlBounds, trim);
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138
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139 /*
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140 * Ensure minimal size. Interacting with a tiny information control
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141 * (resizing, selecting text) would be a pain.
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142 */
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143 controlBounds.width= Math.max(controlBounds.width, MIN_WIDTH);
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144 controlBounds.height= Math.max(controlBounds.height, MIN_HEIGHT);
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145
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146 getInternalAccessor().cropToClosestMonitor(controlBounds);
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147 }
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148
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149 Point location= Geometry.getLocation(controlBounds);
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150 Point size= Geometry.getSize(controlBounds);
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151
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152 // Caveat: some IInformationControls fail unless setSizeConstraints(..) is called with concrete values
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153 informationControl.setSizeConstraints(size.x, size.y);
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154
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155 if (informationControl instanceof IInformationControlExtension2)
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156 ((IInformationControlExtension2) informationControl).setInput(information);
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157 else
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158 informationControl.setInformation(information.toString());
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159
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160 informationControl.setLocation(location);
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161 informationControl.setSize(size.x, size.y);
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162
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163 showInformationControl(subjectArea);
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164 }
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165
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166 /*
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167 * @see dwtx.jface.text.AbstractInformationControlManager#hideInformationControl()
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168 */
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169 public void hideInformationControl() {
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170 super.hideInformationControl();
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171 }
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172
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173 /**
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174 * @param input the delayed input, or <code>null</code> to request cancellation
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175 */
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176 public void setDelayedInput(Object input) {
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177 fReplacableInformation= input;
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178 if (! isReplacing()) {
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179 fDelayedInformationSet= true;
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180 } else if (getCurrentInformationControl2() instanceof IInformationControlExtension2) {
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181 ((IInformationControlExtension2) getCurrentInformationControl2()).setInput(input);
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182 } else if (getCurrentInformationControl2() !is null) {
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183 getCurrentInformationControl2().setInformation(input.toString());
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184 }
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185 }
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186
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187 /**
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188 * Tells whether the replacer is currently replacing another information control.
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189 *
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190 * @return <code>true</code> while code from {@link #replaceInformationControl(IInformationControlCreator, Rectangle, Object, Rectangle, bool)} is run
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191 */
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192 public bool isReplacing() {
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193 return fIsReplacing;
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194 }
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195
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196 /**
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197 * @return the current information control, or <code>null</code> if none available
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198 */
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199 public IInformationControl getCurrentInformationControl2() {
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200 return getInternalAccessor().getCurrentInformationControl();
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201 }
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202
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203 /**
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204 * The number of pixels to blow up the keep-up zone.
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205 *
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206 * @return the margin in pixels
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207 */
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208 public int getKeepUpMargin() {
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209 return 15;
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210 }
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211 }
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