java - 无法点击 HBox 中的按钮

Question

我无法让 buttonContainer HBox 中的按钮工作，因为我根本无法点击它们，它们被“卡住”了，所以说话。这种情况在多个 IDE 中都会发生，所以不可能是这样。我不明白为什么他们被卡住而无法点击它们，但我确信我犯了某种基本错误。

这是我的简单代码:

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

    Button attack, run, drinkPotion, nextRoom;
    StackPane root;
    HBox buttonContainer, roomContainer;
    Scene scene;

    public void createNode() {
        root = new StackPane();
        scene = new Scene(root, 860, 640);

        attack = new Button("Attack");
        run = new Button("Run!");
        drinkPotion = new Button("Drink Potion!");
        nextRoom = new Button("Go to next room...");

        buttonContainer = new HBox(12);
        buttonContainer.getChildren().addAll(attack, run, drinkPotion);
        buttonContainer.setAlignment(Pos.BOTTOM_LEFT);

        roomContainer = new HBox();
        roomContainer.getChildren().addAll(nextRoom);
        roomContainer.setAlignment(Pos.BOTTOM_RIGHT);

        root.getChildren().addAll(buttonContainer, roomContainer);
    }

    public void start(Stage stage) {
        createNode();
        stage.setScene(scene);
        stage.show();
    }
} 

Answer 1

在 StackPane 中，HBox 将调整大小以填充 StackPane。因此，这里的两个 HBox 都填充了整个区域，并通过对齐设置将按钮定位在其中。因此，虽然按钮实际上并不重叠，但 HBox 却重叠了。

StackPane(以及某些情况下的其他 Pane )中节点的 z 顺序由 children 列表中节点的顺序确定。因此，在您的代码中，buttonContainer 位于roomContainer“后面”。这意味着鼠标点击要么针对 roomContainer 中的按钮，要么针对 roomContainer 本身。因此，buttonContainer 中的按钮永远不会收到鼠标点击。

解决此问题的方法是使用“真实”布局容器来适当定位两个按钮容器。例如，您可以使用 AnchorPane:

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

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

    Button attack, run, drinkPotion, nextRoom;
    AnchorPane root;
    HBox buttonContainer, roomContainer;
    Scene scene;

    public void createNode() {
        root = new AnchorPane();
        scene = new Scene(root, 860, 640);

        attack = new Button("Attack");
        run = new Button("Run!");
        drinkPotion = new Button("Drink Potion!");
        nextRoom = new Button("Go to next room...");

        buttonContainer = new HBox(12);
        buttonContainer.getChildren().addAll(attack, run, drinkPotion);

        roomContainer = new HBox();
        roomContainer.getChildren().addAll(nextRoom);

        AnchorPane.setBottomAnchor(buttonContainer, 0.0);
        AnchorPane.setLeftAnchor(buttonContainer, 0.0);

        AnchorPane.setBottomAnchor(roomContainer, 0.0);
        AnchorPane.setRightAnchor(roomContainer, 0.0);

        root.getChildren().addAll(roomContainer, buttonContainer);
    }

    @Override
    public void start(Stage stage) {
        createNode();
        stage.setScene(scene);
        stage.show();
    }
}

或者可能是一个BorderPane:

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

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

    Button attack, run, drinkPotion, nextRoom;
    BorderPane root;
    HBox buttonContainer, roomContainer;
    Scene scene;

    public void createNode() {
        root = new BorderPane();
        scene = new Scene(root, 860, 640);

        attack = new Button("Attack");
        run = new Button("Run!");
        drinkPotion = new Button("Drink Potion!");
        nextRoom = new Button("Go to next room...");

        buttonContainer = new HBox(12);
        buttonContainer.getChildren().addAll(attack, run, drinkPotion);
        buttonContainer.setAlignment(Pos.BOTTOM_CENTER);


        roomContainer = new HBox();
        roomContainer.getChildren().addAll(nextRoom);
        roomContainer.setAlignment(Pos.BOTTOM_CENTER);


        root.setLeft(buttonContainer);
        root.setRight(roomContainer);
    }

    @Override
    public void start(Stage stage) {
        createNode();
        stage.setScene(scene);
        stage.show();
    }
}

您可以在 tutorial 中阅读有关所有布局 Pane 如何工作的概述。