Examples of diva.canvas.event.EventLayer

diva.canvas.event.EventLayer
An event layer is a canvas layer that accepts mouse events. It is designed to be layered over or under other layers, such as FigureLayer, and accepts a number of options that control whether it consumes events and so on. Event layers can have event listeners attached to them, which will be notified when events occur.
Sample uses of the event layer
- On top of a figure layer, events consumed: trap all events before they get to the figure layer.
- On top of a figure layer, events not consumed: monitor all events but still allow the figure layer to respond.
- Behind of a figure layer: catch events on the "background" of the pane, which didn't hit a figure in the figure layer.
@version $Id: EventLayer.java,v 1.14 2005/07/08 19:54:52 cxh Exp $ @author John Reekie

    /** Create a new Graphics pane with the passed Layer
     * as the main graphics pane.
     */
    public GraphicsPane(FigureLayer foregroundLayer) {
        // Background events
        _backgroundEventLayer = new EventLayer();
        _backgroundEventLayer.setEnabled(true);


        // Background layer is a figure layer
        _backgroundLayer = new FigureLayer();
        ((FigureLayer) _backgroundLayer).setVisible(false);
        ((FigureLayer) _backgroundLayer).setEnabled(false);


        // Foreground figures
        _foregroundLayer = foregroundLayer;


        // Overlay layer
        _overlayLayer = new OverlayLayer();


        // Overlay events
        _foregroundEventLayer = new EventLayer();
        _foregroundEventLayer.setEnabled(false);


        // Initialize all these layers.
        _initNewLayer(_backgroundEventLayer);
        _initNewLayer(_backgroundLayer);

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                0));
        _overlayLayer.add(_crosshairX.getShape());
        _overlayLayer.add(_crosshairY.getShape());


        _eventHandler = new ViewScreen2DListener();
        _eventLayer = new EventLayer();
        _eventLayer.addLayerListener(_eventHandler);
        _eventLayer.addLayerMotionListener(_eventHandler);


        pane.setOverlayLayer(_overlayLayer);
        pane.setForegroundEventLayer(_eventLayer);

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Related Classes of diva.canvas.event.EventLayer

diva.canvas.GraphicsPane

diva.canvas.interactor.Interactor

ptolemy.domains.gr.lib.ViewScreen2D

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