How to progate an event to a children

Question

I have code like this:

public void handle(MouseEvent event) {
        //if (event.getEventType() == MouseEvent.MOUSE_CLICKED) {
        if ( ( event.getEventType() == MouseEvent.MOUSE_PRESSED )&&
             (event.isPrimaryButtonDown()) ) {
                x1 = x2 = event.getX();
                y1 = y2 = event.getY();
                line = new BoundLine(pane, event, x1, y1,  x2, y2);
                pane.getChildren().add(line);                    
                //line.getEventDispatcher().dispatchEvent(event, null);
        }
   }

Is it possibile to propagate immediately the "MouseEvent event" to the javafx.scene.shape.Line (line in the code) object ? I have tried line.getEventDispatcher().dispatchEvent(event, null); but I've got this message error:

Exception in thread "JavaFX Application Thread" java.lang.NullPointerException at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35) at testjavafxapplication.LinesEditCtx02$MouseHandler.handle(LinesEditCtx02.java:243) at testjavafxapplication.LinesEditCtx02$MouseHandler.handle(LinesEditCtx02.java:105) at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:69) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:217) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:170) at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92) at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53) at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:33) at javafx.event.Event.fireEvent(Event.java:171) at javafx.scene.Scene$MouseHandler.process(Scene.java:3324) at javafx.scene.Scene$MouseHandler.process(Scene.java:3164) at javafx.scene.Scene$MouseHandler.access$1900(Scene.java:3119) at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1559) at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2261) at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:228) at com.sun.glass.ui.View.handleMouseEvent(View.java:528) at com.sun.glass.ui.View.notifyMouse(View.java:922) at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method) at com.sun.glass.ui.gtk.GtkApplication$3$1.run(GtkApplication.java:82) at java.lang.Thread.run(Thread.java:722)

My goal is to pass mouse event from parent (pane) to children (line) immediately after children is created. Example: 1) left mouse click anywhere on the chart 2) while keep pressed, from pane is create first point of a line 3) still pressed and drag a line is then created: this means that mouse event must be transferred from pane to line — famedoro

Andy Till Andy Till · Accepted Answer · 2012-11-18T19:09:22

The EventDispatchChain (second argument) that is being sent to #dispatchEvent cannot be null. Unfortunately there are no public implementations, or they are in com.sun packages so you would need to implement your own EventDispatchChain.

How to progate an event to a children

1 Answers