如何告诉 GridBagLayout 不要调整我的组件大小

Question

我在垂直 JSplitPane 中有 JPanel。 JPanel 包含 jlabels 和 jtextfields。当我通过移动 JSplitPane 的分隔线来缩小 JPanel 的高度时 jpanel 中的所有组件都会自行调整大小。当父 jpanel 的高度缩小时，如何告诉他们不要调整大小。 我无法调整 JPanel 的 minSize 大小，因为 JSplitPane 无法移动分隔线。

JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
        splitPane.setDividerSize(10);
        splitPane.setOneTouchExpandable(true);

        JPanel searchPanel = createSearchPanel();
        splitPane.setDividerLocation(searchPanel.getPreferredSize().height + 5);
        splitPane.setTopComponent(searchPanel);

如您所见，有searchPanel。来看看吧：

JPanel searchPanel = new JPanel(new GridBagLayout()) {
            Dimension minSize = new Dimension(200, 0);

            @Override
            public Dimension getMinimumSize() {
                return minSize;
            }
        };
        searchPanel.setBorder(BorderFactory.createTitledBorder("Search query"));
        GridBagConstraints gbc = new GridBagConstraints(0, 0, 1, 1, 0, 0,
                GridBagConstraints.LINE_START, GridBagConstraints.HORIZONTAL,
                new Insets(5, 2, 5, 3), 0, 0);
        searchPanel.add(eventLabel, gbc);
        gbc.gridx = 1;
        gbc.gridwidth = 3;
        searchPanel.add(eventLabelField, gbc);
        gbc.gridx = 0;
        gbc.gridy = 1;
        gbc.gridwidth = 1;
        searchPanel.add(timestampLabel, gbc);
        gbc.gridx = 1;
        searchPanel.add(timestampStartField, gbc);
        gbc.gridx = 2;
        searchPanel.add(timestammpToLabel, gbc);
        gbc.gridx = 3;
        searchPanel.add(timestampEndField, gbc);
        gbc.gridx = 0;
        gbc.gridy = 2;
        searchPanel.add(locationLabel, gbc);
        gbc.gridx = 1;
        gbc.gridy = 2;
        gbc.gridwidth = 3;
        searchPanel.add(locationField, gbc);
        gbc.gridx = 0;
        gbc.gridy = 3;
        gbc.gridwidth = 1;
        searchPanel.add(durationMagnitudeLabel, gbc);
        gbc.gridx = 1;
        gbc.gridy = 3;
        searchPanel.add(durationMagnitudeMinField, gbc);
        gbc.gridx = 2;
        searchPanel.add(durationToLabel, gbc);
        gbc.gridx = 3;
        searchPanel.add(durationMagnitudeMaxField, gbc);
        gbc.gridx = 1;
        gbc.gridy = 4;
        gbc.gridwidth = 2;
        gbc.anchor = GridBagConstraints.PAGE_END;
        gbc.weighty = 1.0;
        gbc.ipadx = 2;
        gbc.ipady = 2;
        gbc.insets = new Insets(15, 0, 0, 0);
        searchPanel.add(searchButton, gbc);

当我向上移动垂直分隔线时，searchPanel 的高度会缩小，组件看起来像：

你看到 jtextFields 比我向上移动分隔线后要小得多

请帮帮我。

Answer 1

我已更改您的代码。使用 GridBagConstraint 的 weightx 属性和 GridBagConstraints.HORIZONTAL 填充，它可以帮助组件正确填充它们的单元格。 示例代码：

    JPanel searchPanel = new JPanel(new GridBagLayout()) {
        Dimension minSize = new Dimension(200, 0);

        @Override
        public Dimension getMinimumSize() {
            return minSize;
        }
    };
    searchPanel.setBorder(BorderFactory.createTitledBorder("Search query"));
    GridBagConstraints gbc = new GridBagConstraints(0, 0, 1, 1, 0, 0,
            GridBagConstraints.LINE_START, GridBagConstraints.HORIZONTAL,
            new Insets(5, 2, 5, 3), 0, 0);
    searchPanel.add(new JLabel("1"), gbc);
    gbc.gridx = 1;
    gbc.gridwidth = 3;
    gbc.weightx = 1;
    searchPanel.add(new JTextField(), gbc);
    gbc.gridx = 0;
    gbc.gridy = 1;
    gbc.gridwidth = 1;
    gbc.weightx = 0;
    searchPanel.add(new JLabel("1"), gbc);
    gbc.gridx = 1;
    gbc.weightx = 1;
    searchPanel.add(new JTextField(), gbc);
    gbc.gridx = 2;
    gbc.weightx = 0;
    searchPanel.add(new JLabel("1"), gbc);
    gbc.gridx = 3;
    gbc.weightx = 1;
    searchPanel.add(new JTextField(), gbc);
    gbc.gridx = 0;
    gbc.gridy = 2;
    gbc.weightx = 0;
    searchPanel.add(new JLabel("1"), gbc);
    gbc.gridx = 1;
    gbc.gridy = 2;
    gbc.gridwidth = 3;
    gbc.weightx = 1;
    searchPanel.add(new JTextField(), gbc);
    gbc.gridx = 0;
    gbc.gridy = 3;
    gbc.gridwidth = 1;
    gbc.weightx = 0;
    searchPanel.add(new JLabel("1"), gbc);
    gbc.gridx = 1;
    gbc.gridy = 3;
    gbc.weightx = 1;
    searchPanel.add(new JTextField(), gbc);
    gbc.gridx = 2;
    gbc.weightx = 0;
    searchPanel.add(new JLabel("1"), gbc);
    gbc.gridx = 3;
    gbc.weightx = 1;
    searchPanel.add(new JTextField(), gbc);
    gbc.gridx = 1;
    gbc.gridy = 4;
    gbc.gridwidth = 2;
    gbc.anchor = GridBagConstraints.PAGE_END;
    gbc.weighty = 1.0;
    gbc.ipadx = 2;
    gbc.ipady = 2;
    gbc.insets = new Insets(15, 0, 0, 0);
    gbc.weightx = 0;
    searchPanel.add(new JButton("b"), gbc);
    return searchPanel;

观看docs How to use GridBagLayout

结果：

编辑：抱歉，我使用了糟糕的标签名称）

Answer 2

在底部添加一个虚拟JPanel，并为JPanel 设置weightY=1。所有其余部分的权重Y=0。因此，在高度增加时，所有额外的像素都会针对虚拟JPanel。