Examples of diva.canvas.event.LayerEvent

diva.canvas.event.LayerEvent
The class representing mouse events in layers. This class extends the AWT MouseEvent class, but adds the notion of floating-point coordinates and a "layer source" and "figure source" as well as a component source. Any code that processes a LayerEvent should be sure to use the methods getLayerX, getLayerY, getLayerPoint, instead of the inherited methods getX, getY, getPoint. (Originally, this class was designed to inherit from the AWT InputEvent class, which would have avoided the awkwardness of having two sets of coordinates in the same event object. This wasn't possible because InputEvent has only one package-scope constructor, and hence cannot be subclassed outside the AWT package.) @version $Id: LayerEvent.java,v 1.23 2006/08/21 23:09:19 cxh Exp $ @author John Reekie

     *  value returned by this method used instead.  Even worse,
     *  if you call setToolTipText(null), then tooltips will probably get
     *  disabled entirely!
     */
    public String getToolTipText(MouseEvent e) {
        LayerEvent layerevent = null;


        if (_canvasPane == null) {
            return null;
        }


        // Create a new event and transform layer coordinates if necessary
        layerevent = new LayerEvent(e);


        AffineTransform at = _canvasPane.getTransformContext()
                .getInverseTransform();
        layerevent.transform(at);


        // Process it on the pane
        String tip = _canvasPane.getToolTipText(layerevent);
        return tip;
    }

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    /** Process a mouse event. This internal method is called
     * by both processMouseEvent() and processMouseMotionEvent().
     */
    private void internalProcessMouseEvent(MouseEvent e) {
        LayerEvent layerevent = null;


        if (_canvasPane == null) {
            return;
        }


        // Create a new event and transform layer coordinates if necessary
        layerevent = new LayerEvent(e);


        AffineTransform at = _canvasPane.getTransformContext()
                .getInverseTransform();
        layerevent.transform(at);


        // Process it on the pane
        _canvasPane.dispatchEvent(layerevent);
    }

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        if (source instanceof LayerEvent) {
            _sourceType = CANVAS_TYPE;


            // Action activated using an ActionInteractor.
            LayerEvent event = (LayerEvent) source;
            CanvasLayer layer = event.getLayerSource();
            GraphPane pane = (GraphPane) layer.getCanvasPane();
            GraphController controller = pane.getGraphController();
            GraphModel model = controller.getGraphModel();


            _figure = event.getFigureSource();


            // Set the target.
            if (_figure == null) {
                _target = (NamedObj) model.getRoot();
            } else {
                Object object = _figure.getUserObject();
                _target = (NamedObj) model.getSemanticObject(object);
            }


            // Set the position.
            _x = event.getX();
            _y = event.getY();


            // Set the parent.
            CanvasPane canvasPane = layer.getCanvasPane();
            parent = canvasPane.getCanvas();
        } else if (source instanceof JMenuItem) {

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    /** Return the figure that the mouse pointer is currently over,
     *  or null if none.
     *  @return The figure the mouse is currently over.
     */
    public Figure getCurrentFigure() {
        LayerEvent e = _lastLayerEvent;


        if ((e != null) && (e.getID() != MouseEvent.MOUSE_EXITED)) {
            return getFigure(e);
        } else {
            return null;
        }
    }

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        } else if (id == MouseEvent.MOUSE_MOVED) {
            // Get the figure that the mouse hit, if any.
            Figure figure = getFigure(e);


            if (figure != _pointerOver) {
                LayerEvent event;
                event = new LayerEvent(e, MouseEvent.MOUSE_EXITED);
                dispatchMotionEventUpTree(_pointerOver, event);
                _pointerOver = figure;
                event = new LayerEvent(e, MouseEvent.MOUSE_ENTERED);
                dispatchMotionEventUpTree(_pointerOver, event);
            }
        }
    }

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Related Classes of diva.canvas.event.LayerEvent

diva.canvas.FigureLayer

diva.canvas.JCanvas

ptolemy.vergil.toolbox.FigureAction

java.awt.geom.Point2D

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