public class LinePainter implements IPainter, LineBackgroundListener {
private final ISourceViewer fViewer;
+
private Color fHighlightColor;
+
private IPositionManager fPositionManager;
- // positions to keep track of beginning and end of line to be painted or cleared
- private Position fCurrentLine= new Position(0, 0);
- private Position fLastLine= new Position(0, 0);
+ // positions to keep track of beginning and end of line to be painted or
+ // cleared
+ private Position fCurrentLine = new Position(0, 0);
+
+ private Position fLastLine = new Position(0, 0);
+
// used to keep track of the last line painted
- private int fLastLineNumber= -1;
+ private int fLastLineNumber = -1;
+
private boolean fIsActive;
public LinePainter(ISourceViewer sourceViewer) {
- fViewer= sourceViewer;
+ fViewer = sourceViewer;
}
public void setHighlightColor(Color highlightColor) {
- fHighlightColor= highlightColor;
+ fHighlightColor = highlightColor;
}
/*
public void lineGetBackground(LineBackgroundEvent event) {
// don't use cached line information because of asynch painting
- StyledText textWidget= fViewer.getTextWidget();
+ StyledText textWidget = fViewer.getTextWidget();
if (textWidget != null) {
-
- int caret= textWidget.getCaretOffset();
- int length= event.lineText.length();
+
+ int caret = textWidget.getCaretOffset();
+ int length = event.lineText.length();
if (event.lineOffset <= caret && caret <= event.lineOffset + length)
- event.lineBackground= fHighlightColor;
+ event.lineBackground = fHighlightColor;
else
- event.lineBackground= textWidget.getBackground();
+ event.lineBackground = textWidget.getBackground();
}
}
private boolean updateHighlightLine() {
try {
- IDocument document= fViewer.getDocument();
+ IDocument document = fViewer.getDocument();
- int offset= fViewer.getTextWidget().getCaretOffset() + fViewer.getVisibleRegion().getOffset();
- int lineNumber= document.getLineOfOffset(offset);
-
- // redraw if the current line number is different from the last line number we painted
+ int offset = fViewer.getTextWidget().getCaretOffset()
+ + fViewer.getVisibleRegion().getOffset();
+ int lineNumber = document.getLineOfOffset(offset);
+
+ // redraw if the current line number is different from the last line
+ // number we painted
// initially fLastLineNumber is -1
if (lineNumber != fLastLineNumber) {
-
- fLastLine.offset= fCurrentLine.offset;
- fLastLine.length= fCurrentLine.length;
- fLastLine.isDeleted= fCurrentLine.isDeleted;
- fCurrentLine.isDeleted= false;
- fCurrentLine.offset= document.getLineOffset(lineNumber);
+ fLastLine.offset = fCurrentLine.offset;
+ fLastLine.length = fCurrentLine.length;
+ fLastLine.isDeleted = fCurrentLine.isDeleted;
+
+ fCurrentLine.isDeleted = false;
+ fCurrentLine.offset = document.getLineOffset(lineNumber);
if (lineNumber == document.getNumberOfLines() - 1)
- fCurrentLine.length= document.getLength() - fCurrentLine.offset;
+ fCurrentLine.length = document.getLength()
+ - fCurrentLine.offset;
else
- fCurrentLine.length= document.getLineOffset(lineNumber + 1) - fCurrentLine.offset;
-
- fLastLineNumber= lineNumber;
+ fCurrentLine.length = document
+ .getLineOffset(lineNumber + 1)
+ - fCurrentLine.offset;
+
+ fLastLineNumber = lineNumber;
return true;
-
+
}
-
+
} catch (BadLocationException e) {
}
}
private void drawHighlightLine(Position position, int visibleOffset) {
- StyledText textWidget= fViewer.getTextWidget();
-
+ StyledText textWidget = fViewer.getTextWidget();
+
// if the position that is about to be drawn was deleted then we can't
if (position.isDeleted())
- return;
-
- int delta= position.offset - visibleOffset;
+ return;
+
+ int delta = position.offset - visibleOffset;
if (0 <= delta && delta <= fViewer.getVisibleRegion().getLength()) {
- Point upperLeft= textWidget.getLocationAtOffset(delta);
- int width= textWidget.getClientArea().width + textWidget.getHorizontalPixel();
- int height= textWidget.getLineHeight();
+ Point upperLeft = textWidget.getLocationAtOffset(delta);
+ int width = textWidget.getClientArea().width
+ + textWidget.getHorizontalPixel();
+ int height = textWidget.getLineHeight();
textWidget.redraw(upperLeft.x, upperLeft.y, width, height, false);
}
}
*/
public void deactivate(boolean redraw) {
if (fIsActive) {
- fIsActive= false;
-
- /* on turning off the feature one has to paint the currently
- * highlighted line with the standard background color
+ fIsActive = false;
+
+ /*
+ * on turning off the feature one has to paint the currently
+ * highlighted line with the standard background color
*/
if (redraw)
- drawHighlightLine(fCurrentLine, fViewer.getVisibleRegion().getOffset());
-
+ drawHighlightLine(fCurrentLine, fViewer.getVisibleRegion()
+ .getOffset());
+
fViewer.getTextWidget().removeLineBackgroundListener(this);
-
+
if (fPositionManager != null)
fPositionManager.removeManagedPosition(fCurrentLine);
-
- fLastLineNumber= -1;
+
+ fLastLineNumber = -1;
}
}
* @see IPainter#paint(int)
*/
public void paint(int reason) {
-
+
// check selection
- Point selection= fViewer.getTextWidget().getSelectionRange();
+ Point selection = fViewer.getTextWidget().getSelectionRange();
if (selection.y > 0) {
deactivate(true);
return;
}
-
+
// initialization
if (!fIsActive) {
fViewer.getTextWidget().addLineBackgroundListener(this);
fPositionManager.addManagedPosition(fCurrentLine);
- fIsActive= true;
+ fIsActive = true;
}
-
- //redraw line highlight only if it hasn't been drawn yet on the respective line
+
+ // redraw line highlight only if it hasn't been drawn yet on the
+ // respective line
if (updateHighlightLine()) {
// used to handle segmented view of source files
- int visibleRegionOffset= fViewer.getVisibleRegion().getOffset();
+ int visibleRegionOffset = fViewer.getVisibleRegion().getOffset();
// clear last line
drawHighlightLine(fLastLine, visibleRegionOffset);
// draw new line
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