java 获取节点的维度 - JavaFX 2
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Get the Dimension of a Node - JavaFX 2
提问by Giannis Krimitzas
I am trying to jump to JavaFX from Swing. But I can't find how to get the width and the height of a node.
我正在尝试从 Swing 跳转到 JavaFX。但是我找不到如何获取节点的宽度和高度。
So, here is a bit of code.
所以，这里有一些代码。
Label label = new Label();
label.setText("Hello");
label.setFont(new Font(32));
System.out.println(label.getPrefWidth());
System.out.println(label.getWidth());
System.out.println(label.getMinWidth());
System.out.println(label.getMaxWidth());
The results are:
结果是：
-1.0
0.0
-1.0
-1.0
The same thing in Swing is:
在 Swing 中，同样的事情是：
JComponent.getPreferredSize().width
JComponent.getPreferredSize().height
Thank you
谢谢
After edit:
编辑后：
Why this isn't working for me?
为什么这对我不起作用？
public class Dimensions extends Application {
public static void main(String[] args) {
launch(args);
}
public void start(Stage primaryStage) {
primaryStage.setTitle("Hello World!");
primaryStage.setScene(new Scene(new MyPanel(), 500, 500));
primaryStage.centerOnScreen();
primaryStage.setResizable(false);
primaryStage.show();
}
}
public class MyPanel extends Pane {
public MyPanel() {
Label label = new Label();
label.setText("Hello");
label.setFont(new Font(32));
getChildren().add(label);
label.relocate(150, 150);
System.out.println(label.getWidth());
}
}
回答by Tsangares
Once the node is added to the screen you can use:
将节点添加到屏幕后，您可以使用：
thisNode.getBoundsInParent().getHeight(); //Returns height of object in parent container.
回答by Sergey Grinev
Width and height are not initialized until you put node in a container actually placed on the scene, because they can change depending on container type.
宽度和高度不会被初始化，直到您将节点放入实际放置在场景中的容器中，因为它们可以根据容器类型而改变。
Try next:
接下来试试：
public void start(Stage primaryStage) {
Label label = new Label();
label.setText("Hello");
label.setFont(Font.font("Arial", 32));
System.out.println(label.getWidth());
StackPane root = new StackPane();
root.getChildren().add(label);
Scene scene = new Scene(root, 300, 250);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
System.out.println("------");
System.out.println(label.getWidth());
}
In your code make next changes:
在您的代码中进行下一步更改：
public class Dimensions extends Application {
public static void main(String[] args) {
launch(args);
}
public void start(Stage primaryStage) {
MyPanel myPanel = new MyPanel();
primaryStage.setScene(new Scene(myPanel, 500, 500));
primaryStage.show();
System.out.println(myPanel.label.getWidth());
}
}
class MyPanel extends Pane {
public Label label;
public MyPanel() {
label = new Label();
label.setText("Hello");
label.setFont(new Font(32));
getChildren().add(label);
label.relocate(150, 150);
}
}
