無法點擊HBox中的按鈕

Question

我無法使buttonContainerHBox中的按鈕發揮作用，因爲我根本無法點擊它們，因此可能會「卡住」這樣說。這發生在多個IDE中，所以它不可能是這樣。我不明白爲什麼他們沒有能力點擊它們，但我確信我正在犯一些基本的錯誤。

這裏是我的簡單的代碼：

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 ES將要被調整，以填補StackPane。因此這兩個HBox都填充整個區域，對齊設置將按鈕定位在其中。因此，雖然按鈕實際上不重疊，但HBox es。

StackPane（和其他窗格，在某些情況下）中的節點的z順序由children列表中的節點順序決定。因此，在您的代碼中，buttonContainer位於「後面」roomContainer。這意味着鼠標點擊的目標要麼是roomContainer中的按鈕，要麼是roomContainer本身。因此，buttonContainer中的按鈕永遠不會收到鼠標點擊。

解決方案是使用「真實」佈局容器來適當定位兩個按鈕容器。例如，你可以使用一個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(); 
    } 
} 

或可能是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(); 
    } 
} 

你可以閱讀所有的佈局窗格中tutorial