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1 /*******************************************************************************
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2 * Copyright (c) 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.internal.text.source.DiffPainter;
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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.custom.StyledText;
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22 import dwt.events.DisposeEvent;
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23 import dwt.events.DisposeListener;
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24 import dwt.graphics.Color;
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25 import dwt.graphics.GC;
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26 import dwt.graphics.RGB;
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27 import dwt.widgets.Canvas;
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28 import dwt.widgets.Control;
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29 import dwt.widgets.Display;
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30 import dwtx.core.runtime.Assert;
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31 import dwtx.jface.text.ITextViewer;
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32 import dwtx.jface.text.JFaceTextUtil;
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33 import dwtx.jface.text.source.CompositeRuler;
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34 import dwtx.jface.text.source.IAnnotationHover;
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35 import dwtx.jface.text.source.IAnnotationModel;
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36 import dwtx.jface.text.source.IAnnotationModelExtension;
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37 import dwtx.jface.text.source.IAnnotationModelListener;
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38 import dwtx.jface.text.source.IChangeRulerColumn;
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39 import dwtx.jface.text.source.ILineDiffInfo;
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40 import dwtx.jface.text.source.ILineDiffer;
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41 import dwtx.jface.text.source.ILineDifferExtension2;
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42 import dwtx.jface.text.source.ILineRange;
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43 import dwtx.jface.text.source.ISharedTextColors;
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44 import dwtx.jface.text.source.IVerticalRulerColumn;
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45
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46
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47 /**
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48 * A strategy for painting the quick diff colors onto the vertical ruler column. It also manages the
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49 * quick diff hover.
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50 *
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51 * @since 3.2
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52 */
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53 public final class DiffPainter {
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54 /**
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55 * Internal listener class that will update the ruler when the underlying model changes.
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56 */
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57 private class AnnotationListener : IAnnotationModelListener {
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58 /*
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59 * @see dwtx.jface.text.source.IAnnotationModelListener#modelChanged(dwtx.jface.text.source.IAnnotationModel)
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60 */
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61 public void modelChanged(IAnnotationModel model) {
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62 postRedraw();
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63 }
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64 }
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65
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66 /** The vertical ruler column that delegates painting to this painter. */
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67 private final IVerticalRulerColumn fColumn;
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68 /** The parent ruler. */
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69 private CompositeRuler fParentRuler;
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70 /** The column's control, typically a {@link Canvas}, possibly <code>null</code>. */
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71 private Control fControl;
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72 /** The text viewer that the column is attached to. */
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73 private ITextViewer fViewer;
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74 /** The viewer's text widget. */
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75 private StyledText fWidget;
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76 /** The line differ extracted from the annotation model. */
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77 private ILineDiffer fLineDiffer= null;
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78 /** Color for changed lines */
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79 private Color fAddedColor;
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80 /** Color for added lines */
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81 private Color fChangedColor;
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82 /** Color for the deleted line indicator */
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83 private Color fDeletedColor;
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84 /** The background color. */
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85 private Color fBackground;
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86 /** The ruler's hover */
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87 private IAnnotationHover fHover;
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88 /** The internal listener */
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89 private final AnnotationListener fAnnotationListener= new AnnotationListener();
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90 /** The shared color provider, possibly <code>null</code>. */
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91 private final ISharedTextColors fSharedColors;
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92
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93 /**
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94 * Creates a new diff painter for a vertical ruler column.
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95 *
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96 * @param column the column that will delegate{@link #paint(GC, ILineRange) painting} to the
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97 * newly created painter.
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98 * @param sharedColors a shared colors object to store shaded colors in, may be
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99 * <code>null</code>
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100 */
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101 public DiffPainter(IVerticalRulerColumn column, ISharedTextColors sharedColors) {
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102 Assert.isLegal(column !is null);
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103 fColumn= column;
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104 fSharedColors= sharedColors;
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105 }
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106
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107 /**
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108 * Sets the parent ruler - the delegating column must call this method as soon as it creates its
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109 * control.
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110 *
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111 * @param parentRuler the parent ruler
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112 */
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113 public void setParentRuler(CompositeRuler parentRuler) {
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114 fParentRuler= parentRuler;
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115 }
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116
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117 /**
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118 * Sets the quick diff hover later returned by {@link #getHover()}.
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119 *
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120 * @param hover the hover
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121 */
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122 public void setHover(IAnnotationHover hover) {
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123 fHover= hover;
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124 }
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125
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126 /**
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127 * Returns the quick diff hover set by {@link #setHover(IAnnotationHover)}.
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128 *
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129 * @return the quick diff hover set by {@link #setHover(IAnnotationHover)}
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130 */
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131 public IAnnotationHover getHover() {
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132 return fHover;
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133 }
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134
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135 /**
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136 * Sets the background color.
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137 *
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138 * @param background the background color, <code>null</code> to use the platform's list background
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139 */
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140 public void setBackground(Color background) {
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141 fBackground= background;
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142 }
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143
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144 /**
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145 * Delegates the painting of the quick diff colors to this painter. The painter will draw the
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146 * color boxes onto the passed {@link GC} for all model (document) lines in
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147 * <code>visibleModelLines</code>.
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148 *
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149 * @param gc the {@link GC} to draw onto
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150 * @param visibleModelLines the lines (in document offsets) that are currently (perhaps only
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151 * partially) visible
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152 */
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153 public void paint(GC gc, ILineRange visibleModelLines) {
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154 connectIfNeeded();
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155 if (!isConnected())
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156 return;
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157
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158 // draw diff info
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159 final int lastLine= end(visibleModelLines);
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160 final int width= getWidth();
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161 final Color deletionColor= getDeletionColor();
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162 for (int line= visibleModelLines.getStartLine(); line < lastLine; line++) {
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163 paintLine(line, gc, width, deletionColor);
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164 }
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165 }
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166
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167 /**
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168 * Ensures that the column is fully instantiated, i.e. has a control, and that the viewer is
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169 * visible.
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170 */
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171 private void connectIfNeeded() {
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172 if (isConnected() || fParentRuler is null)
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173 return;
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174
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175 fViewer= fParentRuler.getTextViewer();
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176 if (fViewer is null)
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177 return;
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178
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179 fWidget= fViewer.getTextWidget();
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180 if (fWidget is null)
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181 return;
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182
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183 fControl= fColumn.getControl();
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184 if (fControl is null)
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185 return;
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186
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187 fControl.addDisposeListener(new DisposeListener() {
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188 /*
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189 * @see dwt.events.DisposeListener#widgetDisposed(dwt.events.DisposeEvent)
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190 */
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191 public void widgetDisposed(DisposeEvent e) {
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192 handleDispose();
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193 }
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194 });
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195 }
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196
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197 /**
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198 * Returns <code>true</code> if the column is fully connected.
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199 *
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200 * @return <code>true</code> if the column is fully connected, false otherwise
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201 */
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202 private bool isConnected() {
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203 return fControl !is null;
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204 }
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205
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206 /**
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207 * Disposes of this painter and releases any resources.
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208 */
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209 private void handleDispose() {
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210 if (fLineDiffer !is null) {
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211 ((IAnnotationModel) fLineDiffer).removeAnnotationModelListener(fAnnotationListener);
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212 fLineDiffer= null;
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213 }
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214 }
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215
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216 /**
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217 * Paints a single model line onto <code>gc</code>.
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218 *
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219 * @param line the model line to paint
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220 * @param gc the {@link GC} to paint onto
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221 * @param width the width of the column
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222 * @param deletionColor the background color used to indicate deletions
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223 */
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224 private void paintLine(int line, GC gc, int width, Color deletionColor) {
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225 int widgetLine= JFaceTextUtil.modelLineToWidgetLine(fViewer, line);
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226 if (widgetLine is -1)
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227 return;
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228
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229 ILineDiffInfo info= getDiffInfo(line);
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230
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231 if (info !is null) {
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232 int y= fWidget.getLinePixel(widgetLine);
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233 int lineHeight= fWidget.getLineHeight(fWidget.getOffsetAtLine(widgetLine));
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234
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235 // draw background color if special
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236 if (hasSpecialColor(info)) {
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237 gc.setBackground(getColor(info));
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238 gc.fillRectangle(0, y, width, lineHeight);
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239 }
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240
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241 /* Deletion Indicator: Simply a horizontal line */
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242 int delBefore= info.getRemovedLinesAbove();
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243 int delBelow= info.getRemovedLinesBelow();
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244 if (delBefore > 0 || delBelow > 0) {
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245 gc.setForeground(deletionColor);
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246 if (delBefore > 0)
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247 gc.drawLine(0, y, width, y);
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248 if (delBelow > 0)
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249 gc.drawLine(0, y + lineHeight - 1, width, y + lineHeight - 1);
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250 }
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251 }
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252 }
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253
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254 /**
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255 * Returns whether the line background differs from the default.
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256 *
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257 * @param info the info being queried
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258 * @return <code>true</code> if <code>info</code> describes either a changed or an added
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259 * line.
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260 */
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261 private bool hasSpecialColor(ILineDiffInfo info) {
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262 return info.getChangeType() is ILineDiffInfo.ADDED || info.getChangeType() is ILineDiffInfo.CHANGED;
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263 }
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264
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265 /**
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266 * Retrieves the <code>ILineDiffInfo</code> for <code>line</code> from the model. There are
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267 * optimizations for direct access and sequential access patterns.
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268 *
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269 * @param line the line we want the info for.
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270 * @return the <code>ILineDiffInfo</code> for <code>line</code>, or <code>null</code>.
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271 */
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272 private ILineDiffInfo getDiffInfo(int line) {
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273 if (fLineDiffer !is null)
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274 return fLineDiffer.getLineInfo(line);
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275
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276 return null;
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277 }
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278
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279 /**
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280 * Returns the color for deleted lines.
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281 *
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282 * @return the color to be used for the deletion indicator
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283 */
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284 private Color getDeletionColor() {
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285 return fDeletedColor is null ? getBackground() : fDeletedColor;
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286 }
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287
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288 /**
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289 * Returns the color for the given line diff info.
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290 *
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291 * @param info the <code>ILineDiffInfo</code> being queried
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292 * @return the correct background color for the line type being described by <code>info</code>
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293 */
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294 private Color getColor(ILineDiffInfo info) {
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295 Assert.isTrue(info !is null && info.getChangeType() !is ILineDiffInfo.UNCHANGED);
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296 Color ret= null;
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297 switch (info.getChangeType()) {
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298 case ILineDiffInfo.CHANGED:
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299 ret= getShadedColor(fChangedColor);
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300 break;
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301 case ILineDiffInfo.ADDED:
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302 ret= getShadedColor(fAddedColor);
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303 break;
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304 }
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305 return ret is null ? getBackground() : ret;
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306 }
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307
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308 /**
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309 * Sets the background color for changed lines.
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310 *
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311 * @param color the new color to be used for the changed lines background
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312 * @return the shaded color
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313 */
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314 private Color getShadedColor(Color color) {
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315 if (color is null)
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316 return null;
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317
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318 if (fSharedColors is null)
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319 return color;
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320
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321 RGB baseRGB= color.getRGB();
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322 RGB background= getBackground().getRGB();
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323
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324 bool darkBase= isDark(baseRGB);
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325 bool darkBackground= isDark(background);
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326 if (darkBase && darkBackground)
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327 background= new RGB(255, 255, 255);
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328 else if (!darkBase && !darkBackground)
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329 background= new RGB(0, 0, 0);
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330
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331 return fSharedColors.getColor(interpolate(baseRGB, background, 0.6));
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332 }
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333
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334 /**
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335 * Sets the annotation model.
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336 *
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337 * @param model the annotation model, possibly <code>null</code>
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338 * @see IVerticalRulerColumn#setModel(IAnnotationModel)
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339 */
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340 public void setModel(IAnnotationModel model) {
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341 IAnnotationModel newModel;
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342 if (model instanceof IAnnotationModelExtension)
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343 newModel= ((IAnnotationModelExtension) model).getAnnotationModel(IChangeRulerColumn.QUICK_DIFF_MODEL_ID);
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344 else
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345 newModel= model;
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346
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347 setDiffer(newModel);
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348 }
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349
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350 /**
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351 * Sets the line differ.
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352 *
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353 * @param differ the line differ
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354 */
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355 private void setDiffer(IAnnotationModel differ) {
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356 if (differ instanceof ILineDiffer) {
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357 if (fLineDiffer !is differ) {
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358 if (fLineDiffer !is null)
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359 ((IAnnotationModel) fLineDiffer).removeAnnotationModelListener(fAnnotationListener);
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360 fLineDiffer= (ILineDiffer) differ;
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361 if (fLineDiffer !is null)
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362 ((IAnnotationModel) fLineDiffer).addAnnotationModelListener(fAnnotationListener);
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363 }
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364 }
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365 }
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366
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367 /**
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368 * Triggers a redraw in the display thread.
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369 */
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370 private final void postRedraw() {
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371 if (isConnected() && !fControl.isDisposed()) {
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372 Display d= fControl.getDisplay();
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373 if (d !is null) {
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374 d.asyncExec(new Runnable() {
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375 public void run() {
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376 redraw();
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377 }
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378 });
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379 }
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380 }
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381 }
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382
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383 /**
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384 * Triggers redrawing of the column.
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385 */
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386 private void redraw() {
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387 fColumn.redraw();
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388 }
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389
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390 /**
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391 * Returns the width of the column.
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392 *
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393 * @return the width of the column
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394 */
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395 private int getWidth() {
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396 return fColumn.getWidth();
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397 }
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398
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399 /**
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400 * Computes the end index of a line range.
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401 *
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402 * @param range a line range
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403 * @return the last line (exclusive) of <code>range</code>
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404 */
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405 private static int end(ILineRange range) {
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406 return range.getStartLine() + range.getNumberOfLines();
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407 }
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408
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409 /**
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410 * Returns the System background color for list widgets or the set background.
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411 *
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412 * @return the System background color for list widgets
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413 */
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414 private Color getBackground() {
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415 if (fBackground is null)
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416 return fWidget.getDisplay().getSystemColor(DWT.COLOR_LIST_BACKGROUND);
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417 return fBackground;
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418 }
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419
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420 /**
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421 * Sets the color for added lines.
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422 *
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423 * @param addedColor the color for added lines
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424 * @see dwtx.jface.text.source.IChangeRulerColumn#setAddedColor(dwt.graphics.Color)
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425 */
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426 public void setAddedColor(Color addedColor) {
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427 fAddedColor= addedColor;
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428 }
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429
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430 /**
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431 * Sets the color for changed lines.
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432 *
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433 * @param changedColor the color for changed lines
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434 * @see dwtx.jface.text.source.IChangeRulerColumn#setChangedColor(dwt.graphics.Color)
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435 */
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436 public void setChangedColor(Color changedColor) {
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437 fChangedColor= changedColor;
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438 }
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439
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440 /**
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441 * Sets the color for deleted lines.
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442 *
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443 * @param deletedColor the color for deleted lines
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444 * @see dwtx.jface.text.source.IChangeRulerColumn#setDeletedColor(dwt.graphics.Color)
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445 */
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446 public void setDeletedColor(Color deletedColor) {
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447 fDeletedColor= deletedColor;
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448 }
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449
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450 /**
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451 * Returns <code>true</code> if the receiver can provide a hover for a certain document line.
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452 *
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453 * @param activeLine the document line of interest
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454 * @return <code>true</code> if the receiver can provide a hover
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455 */
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456 public bool hasHover(int activeLine) {
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457 return true;
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458 }
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459
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460 /**
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461 * Returns the display character for the accessibility mode for a certain model line.
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462 *
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463 * @param line the document line of interest
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464 * @return the display character for <code>line</code>
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465 */
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466 public String getDisplayCharacter(int line) {
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467 return getDisplayCharacter(getDiffInfo(line));
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468 }
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469
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470 /**
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471 * Returns the character to display in character display mode for the given
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472 * <code>ILineDiffInfo</code>
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473 *
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474 * @param info the <code>ILineDiffInfo</code> being queried
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475 * @return the character indication for <code>info</code>
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476 */
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477 private String getDisplayCharacter(ILineDiffInfo info) {
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478 if (info is null)
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479 return " "; //$NON-NLS-1$
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480 switch (info.getChangeType()) {
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481 case ILineDiffInfo.CHANGED:
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482 return "~"; //$NON-NLS-1$
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483 case ILineDiffInfo.ADDED:
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484 return "+"; //$NON-NLS-1$
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485 }
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486 return " "; //$NON-NLS-1$
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487 }
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488
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489 /**
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490 * Returns a specification of a color that lies between the given foreground and background
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491 * color using the given scale factor.
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492 *
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493 * @param fg the foreground color
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494 * @param bg the background color
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495 * @param scale the scale factor
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496 * @return the interpolated color
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497 */
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498 private static RGB interpolate(RGB fg, RGB bg, double scale) {
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499 return new RGB((int) ((1.0 - scale) * fg.red + scale * bg.red), (int) ((1.0 - scale) * fg.green + scale * bg.green), (int) ((1.0 - scale) * fg.blue + scale * bg.blue));
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500 }
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501
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502 /**
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503 * Returns the grey value in which the given color would be drawn in grey-scale.
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504 *
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505 * @param rgb the color
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506 * @return the grey-scale value
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507 */
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508 private static double greyLevel(RGB rgb) {
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509 if (rgb.red is rgb.green && rgb.green is rgb.blue)
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510 return rgb.red;
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511 return (0.299 * rgb.red + 0.587 * rgb.green + 0.114 * rgb.blue + 0.5);
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512 }
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513
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514 /**
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515 * Returns whether the given color is dark or light depending on the colors grey-scale level.
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516 *
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517 * @param rgb the color
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518 * @return <code>true</code> if the color is dark, <code>false</code> if it is light
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519 */
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520 private static bool isDark(RGB rgb) {
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521 return greyLevel(rgb) > 128;
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522 }
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523
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524 /**
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525 * Returns <code>true</code> if diff information is being displayed, <code>false</code> otherwise.
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526 *
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527 * @return <code>true</code> if diff information is being displayed, <code>false</code> otherwise
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528 * @since 3.3
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529 */
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530 public bool hasInformation() {
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531 if (fLineDiffer instanceof ILineDifferExtension2)
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532 return !((ILineDifferExtension2) fLineDiffer).isSuspended();
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533 return fLineDiffer !is null;
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534 }
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535
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536 }
|
