GridBagLayout重量错误？ [英] GridBagLayout weight bug?

问题描述

我正在处理的项目中组件的布局看起来不正确，我怀疑Swing中存在一个错误。基本上，似乎发生的情况是，当单元格存在时，没有遵守 weightx 和 weighty 比例布局具有不同的最小尺寸和/或优选尺寸。我创建了一个示例程序来证明这一点，以下是源代码：

The layout of the components in the project I'm working on didn't look correct, I suspect there's a bug in Swing. Basically, what appears to be happening is that the weightx and weighty proportions aren't being adhered to when the cells being laid out have varying minimum sizes and/or preferred sizes. I created a sample program to demonstrate this, here is the source:

package com.ensoftcorp.product.simmerge.gui.swing.dialogs;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class TestClass {

    /**
     * @param args
     */
    public static void main(String[] args) {
        try {
            //UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
            new TestClass();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    static final GridBagConstraints GBC_CELL = new GridBagConstraints();
    static final GridBagConstraints GBC_ROWEND = new GridBagConstraints();
    static final GridBagConstraints GBC_FILLROW = new GridBagConstraints();
    static {
        GBC_CELL.anchor = GridBagConstraints.NORTHWEST;
        GBC_CELL.weightx = 0.5;
        GBC_CELL.fill = GridBagConstraints.BOTH;

        GBC_ROWEND.gridwidth = GridBagConstraints.REMAINDER;

        GBC_FILLROW.gridwidth = GridBagConstraints.REMAINDER;
        GBC_FILLROW.weightx = 1.0;
        GBC_FILLROW.fill = GridBagConstraints.BOTH;
    }

    public TestClass() {
        JFrame frame = new JFrame();

        JPanel pnlContent = new JPanel(new GridBagLayout());
        pnlContent.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));

        /*
         * Layout "ruler" panel
         */
        JPanel pnlRuler = new JPanel(new GridBagLayout());

        pnlRuler.add(createRulerCell(Color.BLACK, Color.WHITE),GBC_CELL);
        pnlRuler.add(createRulerCell(Color.BLACK, Color.WHITE),GBC_CELL);

        pnlRuler.add(Box.createHorizontalGlue(),GBC_ROWEND);

        /*
         * Layout "correct" panel
         */
        JPanel pnlGoodLayout = new JPanel(new GridBagLayout());

        pnlGoodLayout.add(new JButton("JButton1"),GBC_CELL);
        pnlGoodLayout.add(new JButton("JButton2"),GBC_CELL);

        pnlGoodLayout.add(Box.createHorizontalGlue(),GBC_ROWEND);

        pnlGoodLayout.add(new JButton("JButton3"),GBC_CELL);
        pnlGoodLayout.add(new JButton("JButton4"),GBC_CELL);

        pnlGoodLayout.add(Box.createHorizontalGlue(),GBC_ROWEND);

        /*
         * Layout "incorrect" panel
         */
        JPanel pnlBadLayout = new JPanel(new GridBagLayout());

        pnlBadLayout.add(new JButton("JButton1"),GBC_CELL);
        pnlBadLayout.add(new JButton("JButton2"),GBC_CELL);

        pnlBadLayout.add(Box.createHorizontalGlue(),GBC_ROWEND);

        pnlBadLayout.add(new JButton("JButton number 3 is wide"),GBC_CELL);
        pnlBadLayout.add(new JButton("JButton4"),GBC_CELL);

        pnlBadLayout.add(Box.createHorizontalGlue(),GBC_ROWEND);

        /*
         * Add panels to main panel
         */
        pnlContent.add(pnlRuler,GBC_FILLROW);
        pnlContent.add(Box.createVerticalStrut(8),GBC_FILLROW);
        pnlContent.add(pnlGoodLayout,GBC_FILLROW);
        pnlContent.add(Box.createVerticalStrut(8),GBC_FILLROW);
        pnlContent.add(pnlBadLayout,GBC_FILLROW);

        /*
         * Configure frame
         */
        frame.getContentPane().add(pnlContent);
        frame.setTitle("GridBagLayout Weight Bug?");

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400,200);
        frame.setVisible(true);
}

    JComponent createRulerCell(Color border, Color background) {
        JPanel glue = new JPanel();
        glue.setBorder(BorderFactory.createLineBorder(border));
        glue.setBackground(background);

        return glue;
    }

}

示例程序有三组。 ..第一个是显示50％分数的统治者。第二和第三组是使用GridBagLayout的面板，其中每个单元格的 weightx 为0.5。这两组之间的唯一区别是按钮文本的长度，但第二组并没有均匀分配列，即使它有足够的空间来做到这一点。

The sample program has three groups...the first is a "ruler" of sorts to show the 50% mark. The second and third groups are panels using a GridBagLayout where each cell has a weightx of 0.5. The only difference between the groups is the button text length, yet the second group does not evenly proportion the columns even though it has enough space to do so.

然后我的问题是这样的：有没有人遇到过这个问题，并有他们会推荐的解决方法？

My question then is this: has anyone encountered this problem before, and have a workaround they would recommend?

PS - 我正在使用jdk1.6.0_11，如果这有所帮助的话。

P.S. - I am using jdk1.6.0_11, if that makes a difference.

推荐答案

GridBagLayout比较老且冗长。

GridBagLayout is old and verbose.

考虑切换到 FormLayout 或更小替代 - TableLayout 。

Consider switching to FormLayout or to a smaller alternative - TableLayout.

如果你不管怎么写HTML表格，你都会很快得到这两个人背后的想法。

If you ever written HTML tables you will quickly get the idea behind these 2 guys.

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