我想在屏幕上居中放置一个舞台。
这是我试过的:
public class Test extends Application
{
@Override
public void start(final Stage primaryStage)
{
Button btn = new Button();
btn.setText("Say 'Hello World'");
btn.setOnAction(new EventHandler<ActionEvent>()
{
@Override
public void handle(ActionEvent event)
{
System.out.println("Hello World!");
}
});
StackPane root = new StackPane();
root.getChildren().add(btn);
Scene scene = new Scene(root, 300, 250);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.centerOnScreen();
primaryStage.show();
}
public static void main(String[] args)
{
launch(args);
}
}
调用 centerOnScreen() 后，舞台太高了。它似乎无法正常工作。我需要自己计算 x 和 y 位置吗？或者如何正确使用这个功能？
centerOnScreen() 的默认实现如下:
Rectangle2D bounds = getWindowScreen().getVisualBounds();
double centerX = bounds.getMinX() + (bounds.getWidth() - getWidth())
* CENTER_ON_SCREEN_X_FRACTION;
double centerY = bounds.getMinY() + (bounds.getHeight() - getHeight())
* CENTER_ON_SCREEN_Y_FRACTION;
x.set(centerX);
y.set(centerY);
在哪里
CENTER_ON_SCREEN_X_FRACTION = 1.0f / 2;
CENTER_ON_SCREEN_Y_FRACTION = 1.0f / 3;
centerY 总是将舞台设置得比中心高一点。
要将舞台准确定位在中心，您可以使用您设置的自定义 X 和 Y 值。
public class Main extends Application {
@Override
public void start(Stage primaryStage) {
Button btn = new Button();
btn.setText("Say 'Hello World'");
btn.setOnAction((ActionEvent event) -> {
System.out.println("Hello World!");
});
StackPane root = new StackPane();
root.getChildren().add(btn);
Scene scene = new Scene(root, 300, 250);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
Rectangle2D primScreenBounds = Screen.getPrimary().getVisualBounds();
primaryStage.setX((primScreenBounds.getWidth() - primaryStage.getWidth()) / 2);
primaryStage.setY((primScreenBounds.getHeight() - primaryStage.getHeight()) / 2);
}
public static void main(String[] args) {
launch(args);
}
}