/**
* Returns the item under the given point. The point is in display coordinates, relative to this
* composite.
*
* @param p the point query.
* @return an annotation under that point, or null if none.
*/
public RangeAnnotation itemAt(Point p) {
checkWidget();
RangeAnnotation winner = null;
// first, look for all the ones that are in the pixel range
RangeAnnotation[] currentRanges = items.toArray(new RangeAnnotation[items.size()]);
LinkedList<RangeAnnotation> annotationsToScore = new LinkedList<RangeAnnotation>();
for (RangeAnnotation a : currentRanges) {
int low = toVisualValue(a.getOffset());
int high = toVisualValue(a.getLength() + a.getOffset());
if (low == high) {
high++;
}
if (low <= p.x && high >= p.x) {
annotationsToScore.add(a);
}
}
long score = -1;
long rangeValue = toRangeValue(p.x);
for (RangeAnnotation a : annotationsToScore) {
long localScore = 0;
long leftDiff = Math.abs(rangeValue - a.getOffset());
long rightDiff = Math.abs((a.getOffset() + a.getLength()) - rangeValue);
// normalize to 0 because the scaling might be huge
localScore = rightDiff + leftDiff;
if (score == -1 || localScore < score) {
winner = a;
score = localScore;
}
}
return winner;
}
/** @param gc */
private void paintRanges(GC gc, Rectangle bounds) {
// draw a rectangle for each range
gc.setAlpha(200);
for (RangeAnnotation a : items) {
if (a == selectedAnnotation) {
continue;
}
if (a.isDisposed()) continue;
int visualLow = toVisualValue(a.getOffset()) + bounds.x;
int visualHigh = toVisualValue(a.getLength()) + visualLow;
if (visualLow < bounds.x + HANDLE_SIZE) {
visualLow = bounds.x + HANDLE_SIZE;
}
if (visualHigh > bounds.x + bounds.width - HANDLE_SIZE) {
visualHigh = bounds.x + bounds.width - HANDLE_SIZE;
}
Color fg = a.getForeground();
if (a == selectedAnnotation) {
fg = gc.getDevice().getSystemColor(SWT.COLOR_WHITE);
}
if (fg == null) {
fg = getDisplay().getSystemColor(SWT.COLOR_DARK_GRAY);
}
Color bg = a.getBackground();
if (bg == null) {
bg = getDisplay().getSystemColor(SWT.COLOR_GRAY);
}
gc.setForeground(fg);
gc.setBackground(bg);
gc.fillRectangle(visualLow, bounds.y, visualHigh - visualLow, bounds.height - 1);
gc.drawRectangle(visualLow, bounds.y, visualHigh - visualLow - 1, bounds.height - 1);
}
// paint the selected annotation
if (selectedAnnotation != null) {
RangeAnnotation a = selectedAnnotation;
if (a.isDisposed()) return;
int visualLow = toVisualValue(a.getOffset()) + bounds.x;
int visualHigh = toVisualValue(a.getLength()) + visualLow;
if (visualLow < bounds.x + HANDLE_SIZE) {
visualLow = bounds.x + HANDLE_SIZE;
}
if (visualHigh > bounds.x + bounds.width - HANDLE_SIZE) {
visualHigh = bounds.x + bounds.width - HANDLE_SIZE;
}
Color fg = gc.getDevice().getSystemColor(SWT.COLOR_WHITE);
if (fg == null) {
fg = getDisplay().getSystemColor(SWT.COLOR_DARK_GRAY);
}
Color bg = a.getBackground();
if (bg == null) {
bg = getDisplay().getSystemColor(SWT.COLOR_GRAY);
}
gc.setForeground(fg);
gc.setBackground(bg);
gc.fillRectangle(visualLow, bounds.y, visualHigh - visualLow, bounds.height - 1);
gc.drawRectangle(visualLow, bounds.y, visualHigh - visualLow - 1, bounds.height - 1);
}
}
