/**
* Creates a style range for the text viewer.
*
* @param viewer the text viewer
* @return the new style range for the text viewer or <code>null</code>
*/
private StyleRange createStyleRange(ITextViewer viewer) {
StyledText text = viewer.getTextWidget();
if (text == null || text.isDisposed()) {
return null;
}
int widgetCaret = text.getCaretOffset();
int modelCaret = 0;
if (viewer instanceof ITextViewerExtension5) {
ITextViewerExtension5 extension = (ITextViewerExtension5) viewer;
modelCaret = extension.widgetOffset2ModelOffset(widgetCaret);
} else {
IRegion visibleRegion = viewer.getVisibleRegion();
modelCaret = widgetCaret + visibleRegion.getOffset();
}
if (modelCaret >= getReplacementOffset() + getReplacementLength()) {
return null;
}
int length = getReplacementOffset() + getReplacementLength() - modelCaret;
Color foreground = getForegroundColor();
Color background = getBackgroundColor();
return new StyleRange(modelCaret, length, foreground, background);
}
/**
* Convert a widget offset to the corresponding document offset.
*
* @param widgetOffset
* @return document offset
*/
private int getDocumentOffset(int widgetOffset) {
if (fViewer instanceof ITextViewerExtension5) {
ITextViewerExtension5 extension = (ITextViewerExtension5) fViewer;
return extension.widgetOffset2ModelOffset(widgetOffset);
}
IRegion visible = fViewer.getVisibleRegion();
if (widgetOffset > visible.getLength()) {
return -1;
}
return widgetOffset + visible.getOffset();
}
/**
* Convert a document offset to the corresponding widget offset.
*
* @param viewer the text viewer
* @param documentOffset the document offset
* @return widget offset
*/
private int getWidgetOffset(ITextViewer viewer, int documentOffset) {
if (viewer instanceof ITextViewerExtension5) {
ITextViewerExtension5 extension = (ITextViewerExtension5) viewer;
return extension.modelOffset2WidgetOffset(documentOffset);
}
IRegion visible = viewer.getVisibleRegion();
int widgetOffset = documentOffset - visible.getOffset();
if (widgetOffset > visible.getLength()) {
return -1;
}
return widgetOffset;
}
// modified version from TextViewer
private int computeOffsetAtLocation(ITextViewer textViewer, int x, int y) {
StyledText styledText = textViewer.getTextWidget();
IDocument document = textViewer.getDocument();
if (document == null) return -1;
try {
int widgetOffset = styledText.getOffsetAtLocation(new Point(x, y));
Point p = styledText.getLocationAtOffset(widgetOffset);
if (p.x > x) widgetOffset--;
if (textViewer instanceof ITextViewerExtension5) {
ITextViewerExtension5 extension = (ITextViewerExtension5) textViewer;
return extension.widgetOffset2ModelOffset(widgetOffset);
} else {
IRegion visibleRegion = textViewer.getVisibleRegion();
return widgetOffset + visibleRegion.getOffset();
}
} catch (IllegalArgumentException e) {
return -1;
}
}
public void gotoMatchingBracket() {
ITextViewer sourceViewer = langEditor.getSourceViewer_();
IDocument document = sourceViewer.getDocument();
if (document == null) return;
IRegion selection = EditorUtils.getSignedSelection(sourceViewer);
if (fPreviousSelections == null) initializePreviousSelectionList();
IRegion region =
getBracketMatcher().match(document, selection.getOffset(), selection.getLength());
if (region == null) {
region =
getBracketMatcher()
.findEnclosingPeerCharacters(document, selection.getOffset(), selection.getLength());
initializePreviousSelectionList();
fPreviousSelections.add(selection);
} else {
if (fPreviousSelections.size() == 2) {
if (!selection.equals(fPreviousSelections.get(1))) {
initializePreviousSelectionList();
}
} else if (fPreviousSelections.size() == 3) {
if (selection.equals(fPreviousSelections.get(2))
&& !selection.equals(fPreviousSelections.get(0))) {
IRegion originalSelection = fPreviousSelections.get(0);
sourceViewer.setSelectedRange(
originalSelection.getOffset(), originalSelection.getLength());
sourceViewer.revealRange(originalSelection.getOffset(), originalSelection.getLength());
initializePreviousSelectionList();
return;
}
initializePreviousSelectionList();
}
}
if (region == null) {
langEditor.setStatusLineErrorMessage(
LangEditorMessages.GotoMatchingBracket_error_noMatchingBracket);
sourceViewer.getTextWidget().getDisplay().beep();
return;
}
int offset = region.getOffset();
int length = region.getLength();
if (length < 1) return;
int anchor = getBracketMatcher().getAnchor();
// http://dev.eclipse.org/bugs/show_bug.cgi?id=34195
int targetOffset = (ICharacterPairMatcher.RIGHT == anchor) ? offset + 1 : offset + length - 1;
boolean visible = false;
if (sourceViewer instanceof ITextViewerExtension5) {
ITextViewerExtension5 extension = (ITextViewerExtension5) sourceViewer;
visible = (extension.modelOffset2WidgetOffset(targetOffset) > -1);
} else {
IRegion visibleRegion = sourceViewer.getVisibleRegion();
// http://dev.eclipse.org/bugs/show_bug.cgi?id=34195
visible =
(targetOffset >= visibleRegion.getOffset()
&& targetOffset <= visibleRegion.getOffset() + visibleRegion.getLength());
}
if (!visible) {
langEditor.setStatusLineErrorMessage(
LangEditorMessages.GotoMatchingBracket_error_bracketOutsideSelectedElement);
sourceViewer.getTextWidget().getDisplay().beep();
return;
}
int adjustment =
getBracketMatcher()
.getOffsetAdjustment(
document, selection.getOffset() + selection.getLength(), selection.getLength());
targetOffset += adjustment;
int direction = (selection.getLength() == 0) ? 0 : ((selection.getLength() > 0) ? 1 : -1);
if (fPreviousSelections.size() == 1 && direction < 0) {
targetOffset++;
}
if (fPreviousSelections.size() > 0) {
fPreviousSelections.add(new Region(targetOffset, direction));
}
sourceViewer.setSelectedRange(targetOffset, direction);
sourceViewer.revealRange(targetOffset, direction);
}