JavaFX 事件处理快捷方法

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📜 JavaFX 事件处理快捷方法

📅 最后修改于: 2020-10-15 00:33:41 🧑 作者: Mango

便利方法

JavaFX提供了方便的方法，可用于处理JavaFX应用程序中的事件。它们提供了一种简便的方法来创建和注册事件处理程序，以响应KeyEvent，MouseEvent，Action事件，拖放事件等。

Node类包含各种事件处理程序属性，可以使用该类中定义的setter方法将其设置为用户定义的事件处理程序。

将Node类的EventHandler属性设置为用户定义的事件处理程序，将自动注册这些处理程序以接收相应的事件类型。

下表描述了EventHandler属性及其设置方法(便捷方法)。

EventHandler Property	Description	Setter Methods
onContextMenuRequested	This is of the type EventHandler of ContextMenuEvent. This is assigned to a function which is to be called when the context menu is requested on the node.	setOnContextMenuRequested(EventHandler value )
onDragDetected	This is of the type EventHandler of MouseEvent. This indicates a function which is to be called when the drag gesture is detected.	setOnDragDetected(EventHandler value )
onDragDone	This is of the type EventHandler of DragEvent.	setOnDragDone(EventHandler value )
onDragDropped	This is of the type EventHandler of DragEvent. This is assigned to a function which is to be called when the mouse is released during a drag and drop operation.	setOnDragDropped(EventHandler value )
onDragEntered	This is of the type EventHandler of DragEvent. This is assigned to a function which is to be called when the drag gesture enters the node.	setOnDragEntered(EventHandler value )
onDragExited	This is of the type EventHandler of DragEvent. This is assigned to a function which is to be called when the drag gesture exits the node.	setOnDragExited(EventHandler value )
onDragOver	This is of the type EventHandler of DragEvent.This is assigned to a function which is to be called when the drag gesture progresses within the node.	setOnDragOver(EventHandler value )
onInputMethodTextChanged	This is of the type EventHandler of InputMethodEvent. This is assigned to a function which is to be called when the Node has focus and the input method text has changed.	setOnInputMethodTextChanged(EventHandler value )
onKeyPressed	This is of the type EventHandler of KeyEvent. This is assigned to a function which is to be called when the Node has focus and key is pressed.	setOnKeyPressed(EventHandler value )
onKeyReleased	This is of the type EventHandler of KeyEvent. This is assigned to a function which is to be called when the Node has focus and key is released.	setOnKeyReleased(EventHandler value )
onKeyTyped	This is of the type EventHandler of KeyEvent.This is assigned to a function which is to be called when the Node has focus and key is typed.	setOnKeyTyped(EventHandler value )
onMouseClicked	This is of the type EventHandler of MouseEvent. This is assigned to a function which is to be called when the mouse button is clicked on the node.	setOnMouseClicked(EventHandler value )
onMouseDragEntered	This is of the type EventHandler of MouseDragEvent. This is assigned to a function which is to be called when a full press drag release gesture enters the node.	setOnMouseDragEntered(EventHandler value )
onMouseDragExited	This is of the type EventHandler of MouseDragEvent.This is assigned to a function which is to be called when a full press drag release gesture exits the node.	setOnMouseDragExited(EventHandler value )
onMouseDragged	This is of the type EventHandler of MouseDragEvent. This is assigned to a function which is to be called when the mouse button is pressed and dragged on the node.	setOnMouseDragged(EventHandler value )
onMouseDragOver	This is of the type EventHandler of MouseDragEvent. This is assigned to a function which is to be called when a full press drag release gesture progresses within the node.	setOnMouseDragOver(EventHandler value )
onMouseDragReleased	This is of the type EventHandler of MouseDragEvent. This is assigned to a function which is to be called when a full press drag release gesture ends within the node.	setOnMouseDragReleased(EventHandler value )
onMouseEntered	This is of the type EventHandler of MouseEvent. This is assigned to a function which is to be called when the mouse enters the node.	setOnMouseEntered(EventHandler value )
onMouseExited	This is of the type EventHandler of MouseEvent. This is assigned to a function which is to be called when the mouse exits the node.	setOnMouseExited(EventHandler value )
onMouseMoved	This is of the type EventHandler of MouseEvent. This is assigned to a function which is to be called when the mouse moves within the node and no button has been pushed.	setOnMouseMoved(EventHandler value )
onMousePressed	This is of the type EventHandler of MouseEvent. This is assigned to a function which is to be called when the mouse button is pressed on the node.	setOnMousePressed(EventHandler value )
onMouseReleased	This is of the type EventHandler of MouseEvent. This is assigned to a function which is to be called when the mouse button is released on the node.	setOnMouseReleased(EventHandler value )
onRotate	This is of the type EventHandler of RotateEvent. This is assigned to a function which is to be called when the rotation action is performed on the node.	setOnRotate(EventHandler value )
onRotationFinished	This is of the type EventHandler of RotateEvent. This is assigned to a function which is to be called when the rotation gesture ends.	setOnRotationFinished(EventHandler value )
onRotationStarted	This is of the type EventHandler of RotateEvent. This is assigned to a function which is to be called when the rotation gesture is first detected.	setOnRotationStarted(EventHandler value )
onScrollFinished	This is of the type EventHandler of ScrollEvent. This is assigned to a function which is to be called when the scroll gesture ends.	setOnScrollFinished(EventHandler value )
onScroll	This is of the type EventHandler of ScrollEvent. This is assigned to a function which is to be called when the scroll action is performed.	setOnScroll(EventHandler value )
onScrollStarted	This is of the type EventHandler of ScrollEvent. This is assigned to a function which is to be called when the scrolling gesture is detected.	setOnScrollStarted(EventHandler value )
onSwipeDown	This is of the type EventHandler of SwipeEvent. This is assigned to a function which is to be called when the downwards swipe happens on the node.	setOnSwipeDown(EventHandler value )
onSwipeUP	This is of the type EventHandler of SwipeEvent. This is assigned to a function which is to be called when the upwards swipe happens on the node.	setOnSwipeUP(EventHandler value )
onSwipeLeft	This is of the type EventHandler of SwipeEvent. This is assigned to a function which is to be called when the leftwards swipe happens on the node.	setOnSwipeLeft(EventHandler value )
onSwipeRight	This is of the type EventHandler of SwipeEvent. This is assigned to a function which is to be called when the Rightwards swipe happens on the node.	setOnSwipeRight(EventHandler value )
onTouchMoved	This is of the type EventHandler of TouchEvent. This is assigned to a function which is to be called when the touch point is moved on the node.	setOnTouchMoved(EventHandler value )
onTouchReleased	This is of the type EventHandler of TouchEvent. This is assigned to a function which is to be called when the touch point is released on the node.	setOnTouchReleased(EventHandler value )
onTouchStationary	This is of the type EventHandler of TouchEvent. This is assigned to a function which is to be called when the touch point is pressed and stays still	setOnTouchStationary(EventHandler value )
onZoomFinished	This is of the type EventHandler of ZoomEvent. This is assigned to a function which is to be called when the zooming gesture ends.	setOnZoomFinished(EventHandler value )
onZoom	This is of the type EventHandler of ZoomEvent. This is assigned to a function which is to be called when the zooming gesture is performed.	setOnZoom(EventHandler value )
onZoomStarted	This is of the type EventHandler of ZoomEvent. This is assigned to a function which is to be called when the zooming gesture is detected.	setOnZoomStarted(EventHandler value )

用于注册事件处理程序的便捷方法的格式如下

setOnEvent-type(EventHandler value)

其中，事件类型是将通过定义的函数处理的事件的类型，例如，setOnMouseMoved()将是为Mouse_Moved事件注册事件处理程序的便捷方法。

setOnAction()按钮动作的示例

在下面的示例中，说明了setOnAction()方法。单击“播放”按钮并设置为旋转屏幕上的矩形时，将调用用setOnAction()方法注册的EventHandler。

暂停按钮也已注册到EventHandler中，该事件处理程序设置为停止矩形的旋转。

package application;
import javafx.animation.RotateTransition;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.util.Duration;

public class EventHandlerExample extends Application {
  public static void main(String[] args) {
    Application.launch(args);
  }

  @Override
  public void start(Stage primaryStage) {

// Creating Rectangle 
    Rectangle rect = new Rectangle(100,100,120,120);
    
    // Setting Stroke and colour for the rectangle 
    rect.setFill(Color.RED);
    rect.setStroke(Color.BLACK);
    
    // Instantiating RotateTransition class 
    RotateTransition rotate = new RotateTransition();

    //Setting properties for the Rotate Transition class 
    rotate.setAutoReverse(false);
rotate.setByAngle(360);
rotate.setCycleCount(500);
rotate.setDuration(Duration.millis(500));
rotate.setNode(rect);

//Creating the play button 
    Button btn = new Button();
    
    //Setting properties for the play button 
    btn.setText("Play");
    btn.setTranslateX(100);
    btn.setTranslateY(250);
    
    //defining the convenience method to register the event handler to handle the Action event.    
    btn.setOnAction(new EventHandler() {
      public void handle(ActionEvent event) {
      
      rotate.play();
      }
    });
    
    //Creating the pause button 
    Button btn1 = new Button("Pause");
    
    //Setting propertied for the pause button 
    btn1.setTranslateX(160);
    btn1.setTranslateY(250);
    
    //Handling event for the pause button click event 
    btn1.setOnAction(new EventHandler() {

@Override
public void handle(ActionEvent arg0) {
// TODO Auto-generated method stub
rotate.pause();
}
    
});
    
    //Configuring group and scene 
    Group root = new Group();
    Scene scene = new Scene(root, 400, 350);
    root.getChildren().addAll(btn,rect,btn1);
    primaryStage.setScene(scene);
    primaryStage.setTitle("Handling Events");
    primaryStage.show();
  }
}

setOnKeyEvent()按键事件的示例

setOnKeyEvent()方法可用于注册节点上生成的键事件的事件处理程序逻辑。在以下示例中，将创建两个文本字段作为节点，将在第一个文本字段中按下的键设置为在第二个文本字段中的文本。

package application;
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.TextField;
import javafx.scene.input.KeyEvent;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
public class JavaFX_KeyEvent extends Application{

@Override
public void start(Stage primaryStage) throws Exception {

// TODO Auto-generated method stub

//Creating TextFields and setting position for them 
TextField tf1 = new TextField();
TextField tf2 = new TextField();
tf1.setTranslateX(100);
tf1.setTranslateY(100);
tf2.setTranslateX(300);
tf2.setTranslateY(100);

//Handling KeyEvent for textfield 1 
tf1.setOnKeyPressed(new EventHandler() {

@Override
public void handle(KeyEvent key) {
// TODO Auto-generated method stub
tf2.setText("Key Pressed :"+" "+key.getText());
}

});

//setting group and scene 
Group root = new Group();
root.getChildren().addAll(tf2,tf1);
Scene scene = new Scene(root,500,200,Color.WHEAT);
primaryStage.setScene(scene);
primaryStage.setTitle("Handling KeyEvent");
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}

}