Mercurial > projects > dwt-addons
annotate dwtx/jface/text/JFaceTextUtil.d @ 133:7d818bd32d63
Fix ctors to this with gvim regexp
| author | Frank Benoit <benoit@tionex.de> |
|---|---|
| date | Sun, 24 Aug 2008 01:29:22 +0200 |
| parents | c4fb132a086c |
| children | 51e6e63f930e |
| rev | line source |
|---|---|
| 129 | 1 /******************************************************************************* |
| 2 * Copyright (c) 2006, 2008 IBM Corporation and others. | |
| 3 * All rights reserved. This program and the accompanying materials | |
| 4 * are made available under the terms of the Eclipse Public License v1.0 | |
| 5 * which accompanies this distribution, and is available at | |
| 6 * http://www.eclipse.org/legal/epl-v10.html | |
| 7 * | |
| 8 * Contributors: | |
| 9 * IBM Corporation - initial API and implementation | |
| 10 * Port to the D programming language: | |
| 11 * Frank Benoit <benoit@tionex.de> | |
| 12 *******************************************************************************/ | |
| 13 module dwtx.jface.text.JFaceTextUtil; | |
| 14 | |
| 131 | 15 import dwtx.jface.text.IDocumentPartitioningListener; // packageimport |
| 16 import dwtx.jface.text.DefaultTextHover; // packageimport | |
| 17 import dwtx.jface.text.AbstractInformationControl; // packageimport | |
| 18 import dwtx.jface.text.TextUtilities; // packageimport | |
| 19 import dwtx.jface.text.IInformationControlCreatorExtension; // packageimport | |
| 20 import dwtx.jface.text.AbstractInformationControlManager; // packageimport | |
| 21 import dwtx.jface.text.ITextViewerExtension2; // packageimport | |
| 22 import dwtx.jface.text.IDocumentPartitioner; // packageimport | |
| 23 import dwtx.jface.text.DefaultIndentLineAutoEditStrategy; // packageimport | |
| 24 import dwtx.jface.text.ITextSelection; // packageimport | |
| 25 import dwtx.jface.text.Document; // packageimport | |
| 26 import dwtx.jface.text.FindReplaceDocumentAdapterContentProposalProvider; // packageimport | |
| 27 import dwtx.jface.text.ITextListener; // packageimport | |
| 28 import dwtx.jface.text.BadPartitioningException; // packageimport | |
| 29 import dwtx.jface.text.ITextViewerExtension5; // packageimport | |
| 30 import dwtx.jface.text.IDocumentPartitionerExtension3; // packageimport | |
| 31 import dwtx.jface.text.IUndoManager; // packageimport | |
| 32 import dwtx.jface.text.ITextHoverExtension2; // packageimport | |
| 33 import dwtx.jface.text.IRepairableDocument; // packageimport | |
| 34 import dwtx.jface.text.IRewriteTarget; // packageimport | |
| 35 import dwtx.jface.text.DefaultPositionUpdater; // packageimport | |
| 36 import dwtx.jface.text.RewriteSessionEditProcessor; // packageimport | |
| 37 import dwtx.jface.text.TextViewerHoverManager; // packageimport | |
| 38 import dwtx.jface.text.DocumentRewriteSession; // packageimport | |
| 39 import dwtx.jface.text.TextViewer; // packageimport | |
| 40 import dwtx.jface.text.ITextViewerExtension8; // packageimport | |
| 41 import dwtx.jface.text.RegExMessages; // packageimport | |
| 42 import dwtx.jface.text.IDelayedInputChangeProvider; // packageimport | |
| 43 import dwtx.jface.text.ITextOperationTargetExtension; // packageimport | |
| 44 import dwtx.jface.text.IWidgetTokenOwner; // packageimport | |
| 45 import dwtx.jface.text.IViewportListener; // packageimport | |
| 46 import dwtx.jface.text.GapTextStore; // packageimport | |
| 47 import dwtx.jface.text.MarkSelection; // packageimport | |
| 48 import dwtx.jface.text.IDocumentPartitioningListenerExtension; // packageimport | |
| 49 import dwtx.jface.text.IDocumentAdapterExtension; // packageimport | |
| 50 import dwtx.jface.text.IInformationControlExtension; // packageimport | |
| 51 import dwtx.jface.text.IDocumentPartitioningListenerExtension2; // packageimport | |
| 52 import dwtx.jface.text.DefaultDocumentAdapter; // packageimport | |
| 53 import dwtx.jface.text.ITextViewerExtension3; // packageimport | |
| 54 import dwtx.jface.text.IInformationControlCreator; // packageimport | |
| 55 import dwtx.jface.text.TypedRegion; // packageimport | |
| 56 import dwtx.jface.text.ISynchronizable; // packageimport | |
| 57 import dwtx.jface.text.IMarkRegionTarget; // packageimport | |
| 58 import dwtx.jface.text.TextViewerUndoManager; // packageimport | |
| 59 import dwtx.jface.text.IRegion; // packageimport | |
| 60 import dwtx.jface.text.IInformationControlExtension2; // packageimport | |
| 61 import dwtx.jface.text.IDocumentExtension4; // packageimport | |
| 62 import dwtx.jface.text.IDocumentExtension2; // packageimport | |
| 63 import dwtx.jface.text.IDocumentPartitionerExtension2; // packageimport | |
| 64 import dwtx.jface.text.Assert; // packageimport | |
| 65 import dwtx.jface.text.DefaultInformationControl; // packageimport | |
| 66 import dwtx.jface.text.IWidgetTokenOwnerExtension; // packageimport | |
| 67 import dwtx.jface.text.DocumentClone; // packageimport | |
| 68 import dwtx.jface.text.DefaultUndoManager; // packageimport | |
| 69 import dwtx.jface.text.IFindReplaceTarget; // packageimport | |
| 70 import dwtx.jface.text.IAutoEditStrategy; // packageimport | |
| 71 import dwtx.jface.text.ILineTrackerExtension; // packageimport | |
| 72 import dwtx.jface.text.IUndoManagerExtension; // packageimport | |
| 73 import dwtx.jface.text.TextSelection; // packageimport | |
| 74 import dwtx.jface.text.DefaultAutoIndentStrategy; // packageimport | |
| 75 import dwtx.jface.text.IAutoIndentStrategy; // packageimport | |
| 76 import dwtx.jface.text.IPainter; // packageimport | |
| 77 import dwtx.jface.text.IInformationControl; // packageimport | |
| 78 import dwtx.jface.text.IInformationControlExtension3; // packageimport | |
| 79 import dwtx.jface.text.ITextViewerExtension6; // packageimport | |
| 80 import dwtx.jface.text.IInformationControlExtension4; // packageimport | |
| 81 import dwtx.jface.text.DefaultLineTracker; // packageimport | |
| 82 import dwtx.jface.text.IDocumentInformationMappingExtension; // packageimport | |
| 83 import dwtx.jface.text.IRepairableDocumentExtension; // packageimport | |
| 84 import dwtx.jface.text.ITextHover; // packageimport | |
| 85 import dwtx.jface.text.FindReplaceDocumentAdapter; // packageimport | |
| 86 import dwtx.jface.text.ILineTracker; // packageimport | |
| 87 import dwtx.jface.text.Line; // packageimport | |
| 88 import dwtx.jface.text.ITextViewerExtension; // packageimport | |
| 89 import dwtx.jface.text.IDocumentAdapter; // packageimport | |
| 90 import dwtx.jface.text.TextEvent; // packageimport | |
| 91 import dwtx.jface.text.BadLocationException; // packageimport | |
| 92 import dwtx.jface.text.AbstractDocument; // packageimport | |
| 93 import dwtx.jface.text.AbstractLineTracker; // packageimport | |
| 94 import dwtx.jface.text.TreeLineTracker; // packageimport | |
| 95 import dwtx.jface.text.ITextPresentationListener; // packageimport | |
| 96 import dwtx.jface.text.Region; // packageimport | |
| 97 import dwtx.jface.text.ITextViewer; // packageimport | |
| 98 import dwtx.jface.text.IDocumentInformationMapping; // packageimport | |
| 99 import dwtx.jface.text.MarginPainter; // packageimport | |
| 100 import dwtx.jface.text.IPaintPositionManager; // packageimport | |
| 101 import dwtx.jface.text.TextPresentation; // packageimport | |
| 102 import dwtx.jface.text.IFindReplaceTargetExtension; // packageimport | |
| 103 import dwtx.jface.text.ISlaveDocumentManagerExtension; // packageimport | |
| 104 import dwtx.jface.text.ISelectionValidator; // packageimport | |
| 105 import dwtx.jface.text.IDocumentExtension; // packageimport | |
| 106 import dwtx.jface.text.PropagatingFontFieldEditor; // packageimport | |
| 107 import dwtx.jface.text.ConfigurableLineTracker; // packageimport | |
| 108 import dwtx.jface.text.SlaveDocumentEvent; // packageimport | |
| 109 import dwtx.jface.text.IDocumentListener; // packageimport | |
| 110 import dwtx.jface.text.PaintManager; // packageimport | |
| 111 import dwtx.jface.text.IFindReplaceTargetExtension3; // packageimport | |
| 112 import dwtx.jface.text.ITextDoubleClickStrategy; // packageimport | |
| 113 import dwtx.jface.text.IDocumentExtension3; // packageimport | |
| 114 import dwtx.jface.text.Position; // packageimport | |
| 115 import dwtx.jface.text.TextMessages; // packageimport | |
| 116 import dwtx.jface.text.CopyOnWriteTextStore; // packageimport | |
| 117 import dwtx.jface.text.WhitespaceCharacterPainter; // packageimport | |
| 118 import dwtx.jface.text.IPositionUpdater; // packageimport | |
| 119 import dwtx.jface.text.DefaultTextDoubleClickStrategy; // packageimport | |
| 120 import dwtx.jface.text.ListLineTracker; // packageimport | |
| 121 import dwtx.jface.text.ITextInputListener; // packageimport | |
| 122 import dwtx.jface.text.BadPositionCategoryException; // packageimport | |
| 123 import dwtx.jface.text.IWidgetTokenKeeperExtension; // packageimport | |
| 124 import dwtx.jface.text.IInputChangedListener; // packageimport | |
| 125 import dwtx.jface.text.ITextOperationTarget; // packageimport | |
| 126 import dwtx.jface.text.IDocumentInformationMappingExtension2; // packageimport | |
| 127 import dwtx.jface.text.ITextViewerExtension7; // packageimport | |
| 128 import dwtx.jface.text.IInformationControlExtension5; // packageimport | |
| 129 import dwtx.jface.text.IDocumentRewriteSessionListener; // packageimport | |
| 130 import dwtx.jface.text.AbstractReusableInformationControlCreator; // packageimport | |
| 131 import dwtx.jface.text.TabsToSpacesConverter; // packageimport | |
| 132 import dwtx.jface.text.CursorLinePainter; // packageimport | |
| 133 import dwtx.jface.text.ITextHoverExtension; // packageimport | |
| 134 import dwtx.jface.text.IEventConsumer; // packageimport | |
| 135 import dwtx.jface.text.IDocument; // packageimport | |
| 136 import dwtx.jface.text.IWidgetTokenKeeper; // packageimport | |
| 137 import dwtx.jface.text.DocumentCommand; // packageimport | |
| 138 import dwtx.jface.text.TypedPosition; // packageimport | |
| 139 import dwtx.jface.text.IEditingSupportRegistry; // packageimport | |
| 140 import dwtx.jface.text.IDocumentPartitionerExtension; // packageimport | |
| 141 import dwtx.jface.text.AbstractHoverInformationControlManager; // packageimport | |
| 142 import dwtx.jface.text.IEditingSupport; // packageimport | |
| 143 import dwtx.jface.text.IMarkSelection; // packageimport | |
| 144 import dwtx.jface.text.ISlaveDocumentManager; // packageimport | |
| 145 import dwtx.jface.text.DocumentEvent; // packageimport | |
| 146 import dwtx.jface.text.DocumentPartitioningChangedEvent; // packageimport | |
| 147 import dwtx.jface.text.ITextStore; // packageimport | |
| 148 import dwtx.jface.text.JFaceTextMessages; // packageimport | |
| 149 import dwtx.jface.text.DocumentRewriteSessionEvent; // packageimport | |
| 150 import dwtx.jface.text.SequentialRewriteTextStore; // packageimport | |
| 151 import dwtx.jface.text.DocumentRewriteSessionType; // packageimport | |
| 152 import dwtx.jface.text.TextAttribute; // packageimport | |
| 153 import dwtx.jface.text.ITextViewerExtension4; // packageimport | |
| 154 import dwtx.jface.text.ITypedRegion; // packageimport | |
| 155 | |
| 156 | |
| 129 | 157 import dwt.dwthelper.utils; |
| 158 | |
| 159 | |
| 160 | |
| 161 import dwt.custom.StyledText; | |
| 162 import dwt.graphics.GC; | |
| 163 import dwt.graphics.Point; | |
| 164 import dwt.graphics.Rectangle; | |
| 165 import dwt.widgets.Control; | |
| 166 import dwtx.jface.text.source.ILineRange; | |
| 167 import dwtx.jface.text.source.LineRange; | |
| 168 | |
| 169 /** | |
| 170 * A collection of JFace Text functions. | |
| 171 * <p> | |
| 172 * This class is neither intended to be instantiated nor subclassed. | |
| 173 * </p> | |
| 174 * | |
| 175 * @since 3.3 | |
| 176 * @noinstantiate This class is not intended to be instantiated by clients. | |
| 177 */ | |
| 178 public final class JFaceTextUtil { | |
| 179 | |
|
133
7d818bd32d63
Fix ctors to this with gvim regexp
Frank Benoit <benoit@tionex.de>
parents:
131
diff
changeset
|
180 private this() { |
| 129 | 181 // Do not instantiate |
| 182 } | |
| 183 | |
| 184 /** | |
| 185 * Computes the line height for the given line range. | |
| 186 * | |
| 187 * @param textWidget the <code>StyledText</code> widget | |
| 188 * @param startLine the start line | |
| 189 * @param endLine the end line (exclusive) | |
| 190 * @param lineCount the line count used by the old API | |
| 191 * @return the height of all lines starting with <code>startLine</code> and ending above <code>endLime</code> | |
| 192 */ | |
| 193 public static int computeLineHeight(StyledText textWidget, int startLine, int endLine, int lineCount) { | |
| 194 return getLinePixel(textWidget, endLine) - getLinePixel(textWidget, startLine); | |
| 195 } | |
| 196 | |
| 197 /** | |
| 198 * Returns the last fully visible line of the widget. The exact semantics of "last fully visible | |
| 199 * line" are: | |
| 200 * <ul> | |
| 201 * <li>the last line of which the last pixel is visible, if any | |
| 202 * <li>otherwise, the only line that is partially visible | |
| 203 * </ul> | |
| 204 * | |
| 205 * @param widget the widget | |
| 206 * @return the last fully visible line | |
| 207 */ | |
| 208 public static int getBottomIndex(StyledText widget) { | |
| 209 int lastPixel= computeLastVisiblePixel(widget); | |
| 210 | |
| 211 // bottom is in [0 .. lineCount - 1] | |
| 212 int bottom= widget.getLineIndex(lastPixel); | |
| 213 | |
| 214 // bottom is the first line - no more checking | |
| 215 if (bottom is 0) | |
| 216 return bottom; | |
| 217 | |
| 218 int pixel= widget.getLinePixel(bottom); | |
| 219 // bottom starts on or before the client area start - bottom is the only visible line | |
| 220 if (pixel <= 0) | |
| 221 return bottom; | |
| 222 | |
| 223 int offset= widget.getOffsetAtLine(bottom); | |
| 224 int height= widget.getLineHeight(offset); | |
| 225 | |
| 226 // bottom is not showing entirely - use the previous line | |
| 227 if (pixel + height - 1 > lastPixel) | |
| 228 return bottom - 1; | |
| 229 | |
| 230 // bottom is fully visible and its last line is exactly the last pixel | |
| 231 return bottom; | |
| 232 } | |
| 233 | |
| 234 /** | |
| 235 * Returns the index of the first (possibly only partially) visible line of the widget | |
| 236 * | |
| 237 * @param widget the widget | |
| 238 * @return the index of the first line of which a pixel is visible | |
| 239 */ | |
| 240 public static int getPartialTopIndex(StyledText widget) { | |
| 241 // see StyledText#getPartialTopIndex() | |
| 242 int top= widget.getTopIndex(); | |
| 243 int pixels= widget.getLinePixel(top); | |
| 244 | |
| 245 // FIXME remove when https://bugs.eclipse.org/bugs/show_bug.cgi?id=123770 is fixed | |
| 246 if (pixels is -widget.getLineHeight(widget.getOffsetAtLine(top))) { | |
| 247 top++; | |
| 248 pixels= 0; | |
| 249 } | |
| 250 | |
| 251 if (pixels > 0) | |
| 252 top--; | |
| 253 | |
| 254 return top; | |
| 255 } | |
| 256 | |
| 257 /** | |
| 258 * Returns the index of the last (possibly only partially) visible line of the widget | |
| 259 * | |
| 260 * @param widget the text widget | |
| 261 * @return the index of the last line of which a pixel is visible | |
| 262 */ | |
| 263 public static int getPartialBottomIndex(StyledText widget) { | |
| 264 // @see StyledText#getPartialBottomIndex() | |
| 265 int lastPixel= computeLastVisiblePixel(widget); | |
| 266 int bottom= widget.getLineIndex(lastPixel); | |
| 267 return bottom; | |
| 268 } | |
| 269 | |
| 270 /** | |
| 271 * Returns the last visible pixel in the widget's client area. | |
| 272 * | |
| 273 * @param widget the widget | |
| 274 * @return the last visible pixel in the widget's client area | |
| 275 */ | |
| 276 private static int computeLastVisiblePixel(StyledText widget) { | |
| 277 int caHeight= widget.getClientArea().height; | |
| 278 int lastPixel= caHeight - 1; | |
| 279 // XXX what if there is a margin? can't take trim as this includes the scrollbars which are not part of the client area | |
| 280 // if ((textWidget.getStyle() & DWT.BORDER) !is 0) | |
| 281 // lastPixel -= 4; | |
| 282 return lastPixel; | |
| 283 } | |
| 284 | |
| 285 /** | |
| 286 * Returns the line index of the first visible model line in the viewer. The line may be only | |
| 287 * partially visible. | |
| 288 * | |
| 289 * @param viewer the text viewer | |
| 290 * @return the first line of which a pixel is visible, or -1 for no line | |
| 291 */ | |
| 292 public static int getPartialTopIndex(ITextViewer viewer) { | |
| 293 StyledText widget= viewer.getTextWidget(); | |
| 294 int widgetTop= getPartialTopIndex(widget); | |
| 295 return widgetLine2ModelLine(viewer, widgetTop); | |
| 296 } | |
| 297 | |
| 298 /** | |
| 299 * Returns the last, possibly partially, visible line in the view port. | |
| 300 * | |
| 301 * @param viewer the text viewer | |
| 302 * @return the last, possibly partially, visible line in the view port | |
| 303 */ | |
| 304 public static int getPartialBottomIndex(ITextViewer viewer) { | |
| 305 StyledText textWidget= viewer.getTextWidget(); | |
| 306 int widgetBottom= getPartialBottomIndex(textWidget); | |
| 307 return widgetLine2ModelLine(viewer, widgetBottom); | |
| 308 } | |
| 309 | |
| 310 /** | |
| 311 * Returns the range of lines that is visible in the viewer, including any partially visible | |
| 312 * lines. | |
| 313 * | |
| 314 * @param viewer the viewer | |
| 315 * @return the range of lines that is visible in the viewer, <code>null</code> if no lines are | |
| 316 * visible | |
| 317 */ | |
| 318 public static ILineRange getVisibleModelLines(ITextViewer viewer) { | |
| 319 int top= getPartialTopIndex(viewer); | |
| 320 int bottom= getPartialBottomIndex(viewer); | |
| 321 if (top is -1 || bottom is -1) | |
| 322 return null; | |
| 323 return new LineRange(top, bottom - top + 1); | |
| 324 } | |
| 325 | |
| 326 /** | |
| 327 * Converts a widget line into a model (i.e. {@link IDocument}) line using the | |
| 328 * {@link ITextViewerExtension5} if available, otherwise by adapting the widget line to the | |
| 329 * viewer's {@link ITextViewer#getVisibleRegion() visible region}. | |
| 330 * | |
| 331 * @param viewer the viewer | |
| 332 * @param widgetLine the widget line to convert. | |
| 333 * @return the model line corresponding to <code>widgetLine</code> or -1 to signal that there | |
| 334 * is no corresponding model line | |
| 335 */ | |
| 336 public static int widgetLine2ModelLine(ITextViewer viewer, int widgetLine) { | |
| 337 int modelLine; | |
| 338 if (viewer instanceof ITextViewerExtension5) { | |
| 339 ITextViewerExtension5 extension= (ITextViewerExtension5) viewer; | |
| 340 modelLine= extension.widgetLine2ModelLine(widgetLine); | |
| 341 } else { | |
| 342 try { | |
| 343 IRegion r= viewer.getVisibleRegion(); | |
| 344 IDocument d= viewer.getDocument(); | |
| 345 modelLine= widgetLine + d.getLineOfOffset(r.getOffset()); | |
| 346 } catch (BadLocationException x) { | |
| 347 modelLine= widgetLine; | |
| 348 } | |
| 349 } | |
| 350 return modelLine; | |
| 351 } | |
| 352 | |
| 353 /** | |
| 354 * Converts a model (i.e. {@link IDocument}) line into a widget line using the | |
| 355 * {@link ITextViewerExtension5} if available, otherwise by adapting the model line to the | |
| 356 * viewer's {@link ITextViewer#getVisibleRegion() visible region}. | |
| 357 * | |
| 358 * @param viewer the viewer | |
| 359 * @param modelLine the model line to convert. | |
| 360 * @return the widget line corresponding to <code>modelLine</code> or -1 to signal that there | |
| 361 * is no corresponding widget line | |
| 362 */ | |
| 363 public static int modelLineToWidgetLine(ITextViewer viewer, final int modelLine) { | |
| 364 int widgetLine; | |
| 365 if (viewer instanceof ITextViewerExtension5) { | |
| 366 ITextViewerExtension5 extension= (ITextViewerExtension5) viewer; | |
| 367 widgetLine= extension.modelLine2WidgetLine(modelLine); | |
| 368 } else { | |
| 369 IRegion region= viewer.getVisibleRegion(); | |
| 370 IDocument document= viewer.getDocument(); | |
| 371 try { | |
| 372 int visibleStartLine= document.getLineOfOffset(region.getOffset()); | |
| 373 int visibleEndLine= document.getLineOfOffset(region.getOffset() + region.getLength()); | |
| 374 if (modelLine < visibleStartLine || modelLine > visibleEndLine) | |
| 375 widgetLine= -1; | |
| 376 else | |
| 377 widgetLine= modelLine - visibleStartLine; | |
| 378 } catch (BadLocationException x) { | |
| 379 // ignore and return -1 | |
| 380 widgetLine= -1; | |
| 381 } | |
| 382 } | |
| 383 return widgetLine; | |
| 384 } | |
| 385 | |
| 386 | |
| 387 /** | |
| 388 * Returns the number of hidden pixels of the first partially visible line. If there is no | |
| 389 * partially visible line, zero is returned. | |
| 390 * | |
| 391 * @param textWidget the widget | |
| 392 * @return the number of hidden pixels of the first partial line, always >= 0 | |
| 393 */ | |
| 394 public static int getHiddenTopLinePixels(StyledText textWidget) { | |
| 395 int top= getPartialTopIndex(textWidget); | |
| 396 return -textWidget.getLinePixel(top); | |
| 397 } | |
| 398 | |
| 399 /* | |
| 400 * @see StyledText#getLinePixel(int) | |
| 401 */ | |
| 402 public static int getLinePixel(StyledText textWidget, int line) { | |
| 403 return textWidget.getLinePixel(line); | |
| 404 } | |
| 405 | |
| 406 /* | |
| 407 * @see StyledText#getLineIndex(int) | |
| 408 */ | |
| 409 public static int getLineIndex(StyledText textWidget, int y) { | |
| 410 int lineIndex= textWidget.getLineIndex(y); | |
| 411 return lineIndex; | |
| 412 } | |
| 413 | |
| 414 /** | |
| 415 * Returns <code>true</code> if the widget displays the entire contents, i.e. it cannot | |
| 416 * be vertically scrolled. | |
| 417 * | |
| 418 * @param widget the widget | |
| 419 * @return <code>true</code> if the widget displays the entire contents, i.e. it cannot | |
| 420 * be vertically scrolled, <code>false</code> otherwise | |
| 421 */ | |
| 422 public static bool isShowingEntireContents(StyledText widget) { | |
| 423 if (widget.getTopPixel() !is 0) // more efficient shortcut | |
| 424 return false; | |
| 425 | |
| 426 int lastVisiblePixel= computeLastVisiblePixel(widget); | |
| 427 int lastPossiblePixel= widget.getLinePixel(widget.getLineCount()); | |
| 428 return lastPossiblePixel <= lastVisiblePixel; | |
| 429 } | |
| 430 | |
| 431 /** | |
| 432 * Determines the graphical area covered by the given text region in | |
| 433 * the given viewer. | |
| 434 * | |
| 435 * @param region the region whose graphical extend must be computed | |
| 436 * @param textViewer the text viewer containing the region | |
| 437 * @return the graphical extend of the given region in the given viewer | |
| 438 * | |
| 439 * @since 3.4 | |
| 440 */ | |
| 441 public static Rectangle computeArea(IRegion region, ITextViewer textViewer) { | |
| 442 int start= 0; | |
| 443 int end= 0; | |
| 444 IRegion widgetRegion= modelRange2WidgetRange(region, textViewer); | |
| 445 if (widgetRegion !is null) { | |
| 446 start= widgetRegion.getOffset(); | |
| 447 end= start + widgetRegion.getLength(); | |
| 448 } | |
| 449 | |
| 450 StyledText styledText= textViewer.getTextWidget(); | |
| 451 Rectangle bounds; | |
| 452 if (end > 0 && start < end) | |
| 453 bounds= styledText.getTextBounds(start, end - 1); | |
| 454 else { | |
| 455 Point loc= styledText.getLocationAtOffset(start); | |
| 456 bounds= new Rectangle(loc.x, loc.y, getAverageCharWidth(textViewer.getTextWidget()), styledText.getLineHeight(start)); | |
| 457 } | |
| 458 | |
| 459 return new Rectangle(bounds.x, bounds.y, bounds.width, bounds.height); | |
| 460 } | |
| 461 | |
| 462 /** | |
| 463 * Translates a given region of the text viewer's document into | |
| 464 * the corresponding region of the viewer's widget. | |
| 465 * | |
| 466 * @param region the document region | |
| 467 * @param textViewer the viewer containing the region | |
| 468 * @return the corresponding widget region | |
| 469 * | |
| 470 * @since 3.4 | |
| 471 */ | |
| 472 private static IRegion modelRange2WidgetRange(IRegion region, ITextViewer textViewer) { | |
| 473 if (textViewer instanceof ITextViewerExtension5) { | |
| 474 ITextViewerExtension5 extension= (ITextViewerExtension5) textViewer; | |
| 475 return extension.modelRange2WidgetRange(region); | |
| 476 } | |
| 477 | |
| 478 IRegion visibleRegion= textViewer.getVisibleRegion(); | |
| 479 int start= region.getOffset() - visibleRegion.getOffset(); | |
| 480 int end= start + region.getLength(); | |
| 481 if (end > visibleRegion.getLength()) | |
| 482 end= visibleRegion.getLength(); | |
| 483 | |
| 484 return new Region(start, end - start); | |
| 485 } | |
| 486 | |
| 487 /** | |
| 488 * Returns the average character width of the given control's font. | |
| 489 * | |
| 490 * @param control the control to calculate the average char width for | |
| 491 * @return the average character width of the controls font | |
| 492 * | |
| 493 * @since 3.4 | |
| 494 */ | |
| 495 public static int getAverageCharWidth(Control control) { | |
| 496 GC gc= new GC(control); | |
| 497 gc.setFont(control.getFont()); | |
| 498 int increment= gc.getFontMetrics().getAverageCharWidth(); | |
| 499 gc.dispose(); | |
| 500 return increment; | |
| 501 } | |
| 502 | |
| 503 } |