javafx - JavaFX - StackPane 与窗格作为 EventDispatcher
问题描述
在事件调度程序窗格中发生鼠标按下事件。当事件发生时,窗格应显示其组合框的上下文菜单。
如果仅将事件分配到窗格之一,则效果很好。当事件被分配到窗格一和窗格二时,窗格一的上下文菜单不会显示。我想这与事件尾部和事件消耗有关。
到目前为止,我还没有看过 JDK 本身的 EventDispatcher 类。
这是我到目前为止得到的:
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Pane;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
/**
*
* @author Robert
*/
public class EventDispatcherExample extends Application {
private Group root;
private StackPane cStackPane;
private Pane cPaneEventDispatcher;
private Pane cPaneOne;
private ComboBox cComboBox;
private Pane cPaneTwo;
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) throws Exception {
root = new Group();
cStackPane = new StackPane();
cStackPane.setPrefHeight(200.0);
cStackPane.setPrefWidth(200.0);
cPaneEventDispatcher = new Pane();
cPaneEventDispatcher.setPrefHeight(200.0);
cPaneEventDispatcher.setPrefWidth(200.0);
cPaneEventDispatcher.setOnMousePressed(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
//System.out.println("Mouse pressed in Pane ED.");
cPaneOne.fireEvent(event);
cPaneTwo.fireEvent(event);
}
});
cPaneOne = new Pane();
cPaneOne.setPrefHeight(200.0);
cPaneOne.setPrefWidth(200.0);
cPaneOne.setOnMousePressed(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
//System.out.println("Mouse pressed in Pane One.");
cComboBox.show();
}
});
ObservableList<String> observableList = FXCollections.observableArrayList();
observableList.add("1");
observableList.add("2");
observableList.add("3");
cComboBox = new ComboBox();
cComboBox.setLayoutX(50.0);
cComboBox.setLayoutY(50.0);
cComboBox.setPrefHeight(30.0);
cComboBox.setPrefWidth(100.0);
cComboBox.setItems(observableList);
cPaneTwo = new Pane();
cPaneTwo.setPrefHeight(200.0);
cPaneTwo.setPrefWidth(200.0);
cPaneTwo.setOnMousePressed(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
//System.out.println("Mouse pressed in Pane Two.");
//Something will happen because of selected item in Combo Box of pane one...
}
});
cPaneOne.getChildren().add(cComboBox);
// add the nodes in reverse order
cStackPane.getChildren().add(cPaneTwo);
cStackPane.getChildren().add(cPaneOne);
cStackPane.getChildren().add(cPaneEventDispatcher);
root.getChildren().add(cStackPane);
Scene scene = new Scene(root, 200, 200);
primaryStage.setScene(scene);
primaryStage.show();
}
}
任何想法如何处理这个?
解决方案
经过一些想法后,我得到了一个至少有效的解决方案:
import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Pane;
import javafx.scene.layout.StackPane;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
/**
*
* @author Robert
*/
public class EventDispatcherExample extends Application {
private Group root;
private StackPane cStackPane;
private Pane cPaneEventDispatcher;
private Pane cPaneOne;
private ComboBox cComboBox;
private boolean cComboBoxClicked = false;
private Pane cPaneTwo;
public static void main(String[] args) {
launch(args);
}
public boolean isComboBoxClicked() {
if (cComboBoxClicked == true) {
cComboBox.show();
} else {
cComboBox.hide();
}
return cComboBoxClicked;
}
@Override
public void start(Stage primaryStage) throws Exception {
root = new Group();
cStackPane = new StackPane();
cStackPane.setPrefHeight(200.0);
cStackPane.setPrefWidth(200.0);
cPaneEventDispatcher = new Pane();
cPaneEventDispatcher.setPrefHeight(200.0);
cPaneEventDispatcher.setPrefWidth(200.0);
cPaneEventDispatcher.setOnMousePressed(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
//System.out.println("Mouse pressed in Pane ED.");
cPaneOne.fireEvent(event);
cPaneTwo.fireEvent(event);
}
});
cPaneOne = new Pane();
cPaneOne.setPrefHeight(200.0);
cPaneOne.setPrefWidth(200.0);
cPaneOne.setOnMousePressed(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
//System.out.println("Mouse pressed in Pane One.");
Rectangle rect = new Rectangle(cComboBox.getLayoutX(), cComboBox.getLayoutY(),
cComboBox.getPrefWidth(), cComboBox.getPrefHeight());
cComboBoxClicked = rect.contains(event.getX(), event.getY());
}
});
ObservableList<String> observableList = FXCollections.observableArrayList();
observableList.add("1");
observableList.add("2");
observableList.add("3");
cComboBox = new ComboBox();
cComboBox.setLayoutX(50.0);
cComboBox.setLayoutY(50.0);
cComboBox.setPrefHeight(30.0);
cComboBox.setPrefWidth(100.0);
cComboBox.setItems(observableList);
cComboBox.getSelectionModel().selectedItemProperty().addListener(new ChangeListener() {
@Override
public void changed(ObservableValue observable, Object oldValue, Object newValue) {
// if cComboBoxSelectedIndex == 1 do Color on pane two
// if cComboBoxSelectedIndex == 2 do Size on pane two
// if cComboBoxSelectedIndex == 3 do ...
//System.out.println("newValue " + newValue);
}
});
cPaneTwo = new Pane();
cPaneTwo.setPrefHeight(200.0);
cPaneTwo.setPrefWidth(200.0);
cPaneTwo.setOnMousePressed(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
//System.out.println("Mouse pressed in Pane Two.");
boolean cComboBoxClicked = isComboBoxClicked();
if (cComboBoxClicked){
//System.out.println("Skip code internally managed by pane two.");
return;
}
// Internal code of pane two
//...
}
});
cPaneOne.getChildren().add(cComboBox);
// add the nodes in reverse order
cStackPane.getChildren().add(cPaneTwo);
cStackPane.getChildren().add(cPaneOne);
cStackPane.getChildren().add(cPaneEventDispatcher);
root.getChildren().add(cStackPane);
Scene scene = new Scene(root, 200, 200);
primaryStage.setScene(scene);
primaryStage.show();
}
}
也许在其他人的时间里会出现更好的方法。很期待...
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