GridPane内部的JavaFX居中VBox

Question

我真的很感谢你帮我解决问题。

我正在使用JavaFX和NetBeans IDE。我正在为桌面客户端制作一个非常简单的启动窗口。窗口当前与此图像类似。

当前外观：

null

我有一个GridPane作为根。不知道为什么JavaFX选择使用（col,row）,但这就是我在下面表示我的设置的方式：

• @GridPane(0,0)->“欢迎”文本
• @GridPane(0,1)->VBox（此VBox包含上图所示的2个按钮）

相关代码（或者我认为相关的，错了请指正）如下：

//adds GridPane to Scene
GridPane grid = new GridPane();
RowConstraints row1 = new RowConstraints();
row1.setPercentHeight(25);
grid.getRowConstraints().add(row1);
grid.setAlignment(Pos.CENTER);
Scene scene = new Scene(grid, 400, 300,Color.WHITESMOKE);

//Create welcome message and add it to grid, and align it to the center
Text sceneTitle = new Text("Welcome");
grid.add(sceneTitle,0,0);
GridPane.setHalignment(sceneTitle,HPos.CENTER);

//Create buttons and fix their widths
Button newBtn = new Button("Create New Project");
Button loadBtn = new Button("Load Existing Project");
newBtn.setMaxWidth(150);
loadBtn.setMaxWidth(150);

//Create a VBox, add children to it, and then add it to the grid
VBox vBtns = new VBox();
vBtns.setSpacing(5);
vBtns.getChildren().addAll(newBtn,loadBtn);
grid.add(vBtns,0,1);

我试过很多不同的方法…这里要提到一些比较“合乎逻辑”的问题：

//1. Center the VBox within its current GridPane cell
GridPane.setHalignment(vBtns,HPos.CENTER);

//2. Center the buttons within the VBox 
newBtn.setAlignment(Pos.CENTER);
loadBtn.setAlignment(Pos.CENTER);

我从来不擅长GUI编程。当一件本应如此简单的事情需要如此长的时间才能弄清楚时，这是非常令人沮丧的。有没有开发人员可以帮助我找到一个解决方案？

Answer 1

要用当前的安装程序修复它，只需：

vBtns.setAlignment(Pos.CENTER);

然而，这似乎过于复杂。为什么不直接做呢

import javafx.application.Application;
import javafx.geometry.HPos;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.ColumnConstraints;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.RowConstraints;
import javafx.scene.paint.Color;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class LayoutTest extends Application {

    @Override
    public void start(Stage primaryStage) {
        GridPane grid = new GridPane();
        RowConstraints row1 = new RowConstraints();
        row1.setPercentHeight(25);
        grid.getRowConstraints().add(row1);

        ColumnConstraints colConstraints = new ColumnConstraints();
        colConstraints.setHalignment(HPos.CENTER);
        grid.getColumnConstraints().add(colConstraints);

        grid.setAlignment(Pos.CENTER);
        Scene scene = new Scene(grid, 400, 300,Color.WHITESMOKE);

        //Create welcome message and add it to grid, and align it to the center
        Text sceneTitle = new Text("Welcome");
        sceneTitle.setStyle("-fx-font-size:48;");
        grid.add(sceneTitle,0,0);

        //Create buttons and fix their widths
        Button newBtn = new Button("Create New Project");
        Button loadBtn = new Button("Load Existing Project");
        newBtn.setMaxWidth(150);
        loadBtn.setMaxWidth(150);

        grid.add(newBtn, 0, 1);

        GridPane.setMargin(loadBtn, new Insets(5, 0, 5, 0));
        grid.add(loadBtn, 0, 2);

        primaryStage.setScene(scene);
        primaryStage.show();
    }

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