eventsjavafxscrollpaneonmouseclick

Add MouseClick Event on ScrollPane in JavaFX

I have created a Scroll Pane (with Anchor Pane) in JavaFX. On runtime I am creating a rectangle and adding it to the ScrollPane. I want to add a mouse click event on the scroll pane, in which I can change the contents of the scrollPane on runtime.

I tried doing that but I get this exception when I click on the ScrollPane

Exception in thread "JavaFX Application Thread" java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.Trampoline.invoke(Unknown Source)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(Unknown Source)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
at javafx.event.Event.fireEvent(Unknown Source)
at javafx.scene.Scene$ClickGenerator.postProcess(Unknown Source)
at javafx.scene.Scene$ClickGenerator.access$7900(Unknown Source)
at javafx.scene.Scene$MouseHandler.process(Unknown Source)
at javafx.scene.Scene$MouseHandler.access$1500(Unknown Source)
at javafx.scene.Scene.impl_processMouseEvent(Unknown Source)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(Unknown Source)
at com.sun.glass.ui.View.handleMouseEvent(Unknown Source)
at com.sun.glass.ui.View.notifyMouse(Unknown Source)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$141(Unknown Source)
at com.sun.glass.ui.win.WinApplication$$Lambda$37/1109371569.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Here is my JavaFX fxml part,

<ScrollPane fx:id="scrollPane" layoutX="229.0" layoutY="183.0" onMouseClicked="#ChangeImageColor" prefHeight="137.0" prefWidth="143.0">
       <content>
           <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="154.0" prefWidth="157.0" />
       </content>
</ScrollPane>

And My Java Code,

@FXML
void ChangeImageColor(ActionEvent event)
{
    System.out.print("Hit!");
    scrollPane.setContent(null);
    Rectangle rectangle = new Rectangle(200, 200, Color.BLUEVIOLET);
    rectangle.setStroke(Color.BLACK);
    rectangle.setStrokeWidth(25);
    scrollPane.setContent(rectangle);           
}

This is what i am doing on initialization,

Rectangle rectangle = new Rectangle(200, 200, Color.RED);
rectangle.setStroke(Color.BLACK);
rectangle.setStrokeWidth(25);
scrollPane.setContent(rectangle);
Solution

  • The problem you are facing is because of the declaration of the method

    @FXML    
void ChangeImageColor(ActionEvent event)

    Here the parameter should be of type MouseEvent instead of ActionEvent. You can also remove the parameter if you are not sure of the kind of event it is. Try using :

    @FXML    
void ChangeImageColor()

    or

    @FXML    
void ChangeImageColor(MouseEvent event)