在 JavaFX 中的 ScrollPane 上添加 MouseClick 事件

Question

我在 JavaFX 中创建了一个滚动窗格（带有锚窗格）。 在运行时，我正在创建一个矩形并将其添加到 ScrollPane。 我想在滚动窗格上添加一个鼠标单击事件，在其中我可以在运行时更改滚动窗格的内容。

我尝试这样做，但是当我单击 ScrollPane 时出现此异常

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)

这是我的 JavaFX fxml 部分，

<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>

还有我的 Java 代码，

@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);           
}

这就是我在初始化时所做的，

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

Answer 1

你面临的问题是因为方法的声明

@FXML    
void ChangeImageColor(ActionEvent event)

这里参数的类型应该是MouseEvent，而不是ActionEvent。如果您不确定它是什么类型的事件，您也可以删除该参数。尝试使用：

@FXML    
void ChangeImageColor()

或

@FXML    
void ChangeImageColor(MouseEvent event)

Answer 2

我不确定为什么在 fxml 中添加事件不起作用。 我只是在 Java 代码中添加了事件定义，它工作得非常好。

scrollPane.setOnMouseClicked(new EventHandler<Event>() 
{
    @Override
    public void handle(Event event)
    {
         //Logic on event occurrence
    }
});