MigLayout列约束

Question

我正在尝试开发类似的应用程序布局：

 * +------------------+--------+
 * |                  |        |
 * |                  |        |
 * |                  |        |
 * |       70%        |  30%   |
 * |                  |        |
 * |                  |        |
 * |                  |        |
 * |                  |        |
 * |                  |        |
 * +------------------+--------+

为此，我使用了MigLayout。根据此cheat sheet，要设置列权重，我们使用[weight]。但是，它并没有以某种方式工作。看看我的代码：

package com.test;

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.TitledBorder;

import net.miginfocom.swing.MigLayout;

public class MainWindow {

private JFrame frame;
private JTextField iterationsTextField;
private JTextField populationSizeTextField;

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                MainWindow window = new MainWindow();
                window.frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the application.
 */
public MainWindow() {
    initialize();
}

/**
 * Initialize the contents of the frame.
 */
private void initialize() {
    frame = new JFrame();
    frame.setBounds(100, 100, 450, 300);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().setLayout(new MigLayout("", "[grow 70][grow 30]", "[grow]"));

    JPanel canvasPanel = new JPanel();
    frame.getContentPane().add(canvasPanel, "cell 0 0,grow");
    canvasPanel.setLayout(new MigLayout("", "[]", "[]"));

    JPanel settingsPanel = new JPanel();
    settingsPanel.setBorder(new TitledBorder(null, "Settings", TitledBorder.LEADING, TitledBorder.TOP, null, null));
    frame.getContentPane().add(settingsPanel, "cell 1 0,grow");
    settingsPanel.setLayout(new MigLayout("", "[][grow]", "[][]"));

    JLabel iterationsLabel = new JLabel("Iterations");
    settingsPanel.add(iterationsLabel, "cell 0 0,alignx trailing");

    iterationsTextField = new JTextField();
    iterationsTextField.setText("1000");
    settingsPanel.add(iterationsTextField, "cell 1 0,growx");
    iterationsTextField.setColumns(10);

    JLabel populationSizeLabel = new JLabel("Population");
    settingsPanel.add(populationSizeLabel, "cell 0 1,alignx trailing");

    populationSizeTextField = new JTextField();
    settingsPanel.add(populationSizeTextField, "cell 1 1,growx");
    populationSizeTextField.setColumns(10);
}

}

我认为使用此配置设置框架"[grow 70][grow 30]"面板canvasPanel应该是屏幕宽度的70％，而settingsPanel应该是30％。看看最终结果：

如您所见，settingsPanel比canvasPanel更长。我错过了什么吗？

提前致谢！

Answer 1

您的问题是对约束语法的误解：

grow 70

是单一约束，该数字定义了列获得额外空间的渴望的相对权重。要在示例中查看它，请增加框架的宽度：附加宽度在两列之间以70:30分布。

grow, 70%

是两个约束，第一个定义增长行为（默认权重为100），第二个定义宽度为百分比。