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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 dwtx.jface.text.source.projection.ProjectionAnnotation;
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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
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20 import dwt.DWT;
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21 import dwt.graphics.FontMetrics;
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22 import dwt.graphics.GC;
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23 import dwt.graphics.Image;
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24 import dwt.graphics.Rectangle;
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25 import dwt.widgets.Canvas;
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26 import dwt.widgets.Display;
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27 import dwtx.jface.resource.ImageDescriptor;
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28 import dwtx.jface.text.source.Annotation;
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29 import dwtx.jface.text.source.IAnnotationPresentation;
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30 import dwtx.jface.text.source.ImageUtilities;
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31
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32 /**
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33 * Annotation used to represent the projection of a master document onto a
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34 * {@link dwtx.jface.text.projection.ProjectionDocument}. A projection
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35 * annotation can be either expanded or collapsed. If expanded it corresponds to
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36 * a segment of the projection document. If collapsed, it represents a region of
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37 * the master document that does not have a corresponding segment in the
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38 * projection document.
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39 * <p>
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40 * Clients may subclass or use as is.
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41 * </p>
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42 *
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43 * @since 3.0
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44 */
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45 public class ProjectionAnnotation : Annotation , IAnnotationPresentation {
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46
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47 private static class DisplayDisposeRunnable : Runnable {
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48
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49 public void run() {
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50 if (fgCollapsedImage !is null) {
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51 fgCollapsedImage.dispose();
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52 fgCollapsedImage= null;
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53 }
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54 if (fgExpandedImage !is null) {
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55 fgExpandedImage.dispose();
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56 fgExpandedImage= null;
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57 }
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58 }
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59 }
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60
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61 /**
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62 * The type of projection annotations.
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63 */
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64 public static final String TYPE= "dwtx.projection"; //$NON-NLS-1$
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65
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66
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67 private static final int COLOR= DWT.COLOR_GRAY;
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68 private static Image fgCollapsedImage;
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69 private static Image fgExpandedImage;
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70
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71
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72 /** The state of this annotation */
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73 private bool fIsCollapsed= false;
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74 /** Indicates whether this annotation should be painted as range */
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75 private bool fIsRangeIndication= false;
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76
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77 /**
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78 * Creates a new expanded projection annotation.
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79 */
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80 public ProjectionAnnotation() {
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81 this(false);
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82 }
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83
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84 /**
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85 * Creates a new projection annotation. When <code>isCollapsed</code>
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86 * is <code>true</code> the annotation is initially collapsed.
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87 *
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88 * @param isCollapsed <code>true</code> if the annotation should initially be collapsed, <code>false</code> otherwise
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89 */
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90 public ProjectionAnnotation(bool isCollapsed) {
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91 super(TYPE, false, null);
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92 fIsCollapsed= isCollapsed;
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93 }
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94
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95 /**
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96 * Enables and disables the range indication for this annotation.
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97 *
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98 * @param rangeIndication the enable state for the range indication
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99 */
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100 public void setRangeIndication(bool rangeIndication) {
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101 fIsRangeIndication= rangeIndication;
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102 }
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103
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104 private void drawRangeIndication(GC gc, Canvas canvas, Rectangle r) {
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105 final int MARGIN= 3;
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106
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107 /* cap the height - at least on GTK, large numbers are converted to
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108 * negatives at some point */
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109 int height= Math.min(r.y + r.height - MARGIN, canvas.getSize().y);
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110
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111 gc.setForeground(canvas.getDisplay().getSystemColor(COLOR));
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112 gc.setLineWidth(0); // NOTE: 0 means width is 1 but with optimized performance
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113 gc.drawLine(r.x + 4, r.y + 12, r.x + 4, height);
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114 gc.drawLine(r.x + 4, height, r.x + r.width - MARGIN, height);
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115 }
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116
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117 /*
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118 * @see dwtx.jface.text.source.IAnnotationPresentation#paint(dwt.graphics.GC, dwt.widgets.Canvas, dwt.graphics.Rectangle)
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119 */
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120 public void paint(GC gc, Canvas canvas, Rectangle rectangle) {
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121 Image image= getImage(canvas.getDisplay());
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122 if (image !is null) {
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123 ImageUtilities.drawImage(image, gc, canvas, rectangle, DWT.CENTER, DWT.TOP);
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124 if (fIsRangeIndication) {
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125 FontMetrics fontMetrics= gc.getFontMetrics();
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126 int delta= (fontMetrics.getHeight() - image.getBounds().height)/2;
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127 rectangle.y += delta;
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128 rectangle.height -= delta;
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129 drawRangeIndication(gc, canvas, rectangle);
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130 }
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131 }
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132 }
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133
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134 /*
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135 * @see dwtx.jface.text.source.IAnnotationPresentation#getLayer()
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136 */
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137 public int getLayer() {
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138 return IAnnotationPresentation.DEFAULT_LAYER;
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139 }
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140
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141 private Image getImage(Display display) {
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142 initializeImages(display);
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143 return isCollapsed() ? fgCollapsedImage : fgExpandedImage;
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144 }
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145
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146 private void initializeImages(Display display) {
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147 if (fgCollapsedImage is null) {
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148
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149 ImageDescriptor descriptor= ImageDescriptor.createFromFile(ProjectionAnnotation.class, "images/collapsed.gif"); //$NON-NLS-1$
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150 fgCollapsedImage= descriptor.createImage(display);
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151 descriptor= ImageDescriptor.createFromFile(ProjectionAnnotation.class, "images/expanded.gif"); //$NON-NLS-1$
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152 fgExpandedImage= descriptor.createImage(display);
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153
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154 display.disposeExec(new DisplayDisposeRunnable());
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155 }
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156 }
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157
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158 /**
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159 * Returns the state of this annotation.
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160 *
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161 * @return <code>true</code> if collapsed
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162 */
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163 public bool isCollapsed() {
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164 return fIsCollapsed;
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165 }
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166
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167 /**
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168 * Marks this annotation as being collapsed.
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169 */
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170 public void markCollapsed() {
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171 fIsCollapsed= true;
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172 }
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173
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174 /**
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175 * Marks this annotation as being unfolded.
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176 */
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177 public void markExpanded() {
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178 fIsCollapsed= false;
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179 }
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180 }
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