无法使用JavaFX使网格居中 [英] Unable to Center a Grid Using JavaFX

问题描述

我正在使用 grid.setAlignment（Pos.CENTER）; 将我的网格集中在JavaFX场景中，但它似乎不起作用。无论我给出什么位置，网格总是显示在场景的左上角。谁能看到我做错了什么？

I'm using grid.setAlignment(Pos.CENTER); to center my grid within the JavaFX scene however it doesn't seem to work. The grid always displays in the top left of the scene no matter what position I give it. Can anyone see what I'm doing wrong?

我的整个代码（减去进口）如下：

My entire code (minus imports) is as follows:

*public class Main extends Application {
@Override
public void start(Stage stage) throws Exception {
Scene scene = new Scene(new Group(), 450, 250);

Button btn = new Button();
btn.setText("Run");


final ComboBox comboBox = new ComboBox();
comboBox.getItems().addAll(
"Phase 1",
"Phase 2",
"Phase 3",
"Phase 4",
"Phase 5"  
);

GridPane grid = new GridPane();
grid.setAlignment(Pos.CENTER);
grid.setVgap(10);
grid.setHgap(10);
grid.setPadding(new Insets(5, 5, 5, 5));
grid.add(new Label("Select Phase: "), 0, 0);
grid.add(comboBox, 1, 0);
grid.add(new Label("Select Data: "), 0, 1);
grid.add(btn, 0, 2);

Group root = (Group)scene.getRoot();
root.getChildren().add(grid);
stage.setScene(scene);


stage.show();
}*

谢谢！

推荐答案

这不是 grid.setAlignment（...）的作用：它对齐网格中网格窗格的整体内容窗格的界限（参见 docs ）。

That's not what grid.setAlignment(...) does: it aligns the overall content of the grid pane within the grid pane's bounds (see docs).

网格窗格在其父级内的位置由其父级确定。如果您希望它居中，请使用知道如何居中的父级，例如 StackPane ：

The position of the grid pane within its parent is determined by its parent. If you want it centered, use a parent that knows how to center things, such as a StackPane:

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class Main extends Application {
    @Override
    public void start(Stage stage) throws Exception {

        StackPane root = new StackPane();

        Scene scene = new Scene(root, 450, 250);

        Button btn = new Button();
        btn.setText("Run");

        final ComboBox<String> comboBox = new ComboBox<>();
        comboBox.getItems().addAll("Phase 1", "Phase 2", "Phase 3", "Phase 4", "Phase 5");

        GridPane grid = new GridPane();

        grid.setVgap(10);
        grid.setHgap(10);
        grid.setPadding(new Insets(5, 5, 5, 5));
        grid.add(new Label("Select Phase: "), 0, 0);
        grid.add(comboBox, 1, 0);
        grid.add(new Label("Select Data: "), 0, 1);
        grid.add(btn, 0, 2);


        root.getChildren().add(grid);
        stage.setScene(scene);

        stage.show();
    }

    public static void main(String[] args) { launch(args);}
}

这篇关于无法使用JavaFX使网格居中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！