/** {@inheritDoc} */
@Override
public void mouseDragged(final MouseEvent aEvent) {
final MouseEvent event = convertEvent(aEvent);
final Point point = event.getPoint();
// Update the selected channel while dragging...
this.controller.setSelectedChannel(point);
if (getModel().isCursorMode() && (this.movingCursor >= 0)) {
this.controller.moveCursor(this.movingCursor, getCursorDropPoint(point));
aEvent.consume();
} else {
if ((this.lastClickPosition == null)
&& ((aEvent.getModifiersEx() & InputEvent.BUTTON1_DOWN_MASK) != 0)) {
this.lastClickPosition = new Point(point);
}
final JScrollPane scrollPane =
getAncestorOfClass(JScrollPane.class, (Component) aEvent.getSource());
if ((scrollPane != null) && (this.lastClickPosition != null)) {
final JViewport viewPort = scrollPane.getViewport();
final Component signalView = this.controller.getSignalDiagram().getSignalView();
boolean horizontalOnly = (aEvent.getModifiersEx() & InputEvent.ALT_DOWN_MASK) != 0;
boolean verticalOnly =
horizontalOnly && ((aEvent.getModifiersEx() & InputEvent.SHIFT_DOWN_MASK) != 0);
int dx = aEvent.getX() - this.lastClickPosition.x;
int dy = aEvent.getY() - this.lastClickPosition.y;
Point scrollPosition = viewPort.getViewPosition();
int newX = scrollPosition.x;
if (!verticalOnly) {
newX -= dx;
}
int newY = scrollPosition.y;
if (verticalOnly || !horizontalOnly) {
newY -= dy;
}
int diagramWidth = signalView.getWidth();
int viewportWidth = viewPort.getWidth();
int maxX = diagramWidth - viewportWidth - 1;
scrollPosition.x = Math.max(0, Math.min(maxX, newX));
int diagramHeight = signalView.getHeight();
int viewportHeight = viewPort.getHeight();
int maxY = diagramHeight - viewportHeight;
scrollPosition.y = Math.max(0, Math.min(maxY, newY));
viewPort.setViewPosition(scrollPosition);
}
// Use UNCONVERTED/ORIGINAL mouse event!
handleZoomRegion(aEvent, this.lastClickPosition);
}
}
/**
* Calculates the drop point for the cursor under the given coordinate.
*
* @param aCoordinate the coordinate to return the channel drop point for, cannot be <code>null
* </code>.
* @return a drop point, never <code>null</code>.
*/
private Point getCursorDropPoint(final Point aCoordinate) {
Point dropPoint = new Point(aCoordinate);
if (getModel().isSnapCursorMode()) {
final MeasurementInfo signalHover = getModel().getSignalHover(aCoordinate);
if ((signalHover != null) && !signalHover.isEmpty()) {
dropPoint.x = signalHover.getMidSamplePos().intValue();
}
}
dropPoint.y = 0;
return dropPoint;
}