Java 类org.eclipse.swt.events.DragDetectEvent 实例源码

@Override
public void dragDetected(DragDetectEvent arg0) {
  GraphDataSet dataSet = AmbushGraph.this.currentDataSet;
  if (arg0.button != 1 || ! zoomedIn(dataSet)) {
    return;
  }

  double xFactor = previewShell.getSize().x / (dataSet.naturalBounds.x * dataSet.zoomFactor);
  double yFactor = previewShell.getSize().y / (dataSet.naturalBounds.y * dataSet.zoomFactor);
  // calculate view port origin in preview window coordinates
  int translatedMainOriginX = (int)(dataSet.mainOrigin.x * xFactor);
  int translatedMainOriginY = (int)(dataSet.mainOrigin.y * yFactor);
  // calculate how large the view port is on the preview window
  int translatedMainWidth = (int)(mainShell.getSize().x * xFactor);
  int translatedMainHeight = (int)(mainShell.getSize().y * yFactor);
  if (arg0.x > translatedMainOriginX && arg0.x < translatedMainOriginX + translatedMainWidth &&
      arg0.y > translatedMainOriginY && arg0.y < translatedMainOriginY + translatedMainHeight) {
    // clicked inside view port, so drag viewport
    dataSet.dragPoint = new Point(arg0.x, arg0.y);
  }
}

/**
 * Swaps two tabs and corresponding notes when a user drags one to another.
 */
private void addSwapTabListener() {
    tabFolder.addDragDetectListener(new DragDetectListener() {
        @Override
        public void dragDetected(DragDetectEvent dragDetectedEvent) {
            final Rectangle viewRectangle = Geometry.toDisplay(tabFolder.getParent(), tabFolder.getBounds());
            final Tracker tracker = new Tracker(tabFolder, SWT.NONE);
            tracker.setStippled(true);
            tracker.addListener(SWT.Move, new Listener() {
                @Override
                public void handleEvent(Event event) {
                    Point location = new Point(event.x - viewRectangle.x, event.y - viewRectangle.y);
                    CTabItem tabAtLocation = tabFolder.getItem(location);
                    if (tabAtLocation != null) {
                        // Move tracker to follow mouse cursor.
                        tracker.setRectangles(new Rectangle[] { tabAtLocation.getBounds() });
                    } else {
                        // Mouse cursor no longer above any tab in the action bar, hide tacker.
                        tracker.setRectangles(new Rectangle[0]);
                    }
                }
            });
            if (tracker.open()) {
                Rectangle[] rectangles = tracker.getRectangles();
                if (rectangles.length > 0) {
                    CTabItem tabToSwap = tabFolder.getItem(new Point(rectangles[0].x, rectangles[0].y));
                    // Swap selected tab with the one situated at the mouse cursor's position.
                    if (tabToSwap != null) {
                        swapNoteTabs(tabFolder.indexOf(tabToSwap));
                    }
                }
            }
            tracker.close();
            tracker.dispose();
        }
    });
}

@Override
public void dragDetected(DragDetectEvent dde) {
  if (dde.button != 1) {
    return;
  }

  GraphDataSet dataSet = AmbushGraph.this.currentDataSet;
  dataSet.movingPoint = getClosestPoint(dde.x, dde.y);
  if (dataSet.movingPoint == null && zoomedIn(dataSet)) {
    // no point selected, so record where drag started for shifting the screen
    dataSet.dragPoint = new Point(dde.x, dde.y);
  }
}

@Override
public void dragDetected(final DragDetectEvent e) {
    if (!ok())
        return;
    // System.out.println("Mouse drag detected on " + view.getPartName());
    // surface.draggedTo(e.x, e.y);
    surface.dispatchMouseEvent(SWT.DragDetect);
}

@Override
public void dragDetected( DragDetectEvent event ) {
  if( startingPosition != null ) {
    dragAction.run( startingPosition.x, startingPosition.y, event.x, event.y );
  }
  dragDetector.dragHandled();
}

@Override
public void dragDetected( final DragDetectEvent event ) {
    if ( targetColumn == null ) return;
    if ( targetColumn == column ) offset = column.header.getSize().x - event.x;
    else offset = -event.x;
    dragging = true;
}

@Override
public void dragDetected( DragDetectEvent e ) {
  isDragging = true;
  mouseUp = false;
}