Question

我第一次使用Swing的{{1}}，到目前为止我只在容器中添加了两个组件，但我打算在垂直方向下添加更多组件。到目前为止，第一个组件（GridBagLayout）正确定位在JLabel，我记得为组件的相应PAGE_START设置了权重属性。然而，第二个组件（GridBagConstraints）没有按照我的意图定位，它在容器中居中而不是在JTextField下方向上移动。我试图使用多个锚定常量，包括JLabel，FIRST_LINE_START，PAGE_START＆amp; NORTH但到目前为止没有任何工作。

所以，我再一次呼吁stackoverflow的天才编码员寻求帮助。下面是代码片段，下面是图形问题的图像。

NORTHWEST

下图;

enter image description here

感谢大家提供的任何帮助。

Answer 1

尝试将weighty的{{1}}增加到更大的值。我做了一个快速测试，将其设置为1000：

addressLine1

并将addressLine1GC.weighty = 1000.0;字段向上推到标签下面，下面是空格。

Answer 2

anchor = NORTH就像一个魅力：

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class TestJPanels {

    private JLabel refPlusType;
    private JTextField addressLine1;

    protected void initUI() {
        final JFrame frame = new JFrame(TestJPanels.class.getSimpleName());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel panel = new JPanel(new GridBagLayout());
        // Instantiate components and configure their corresponding GridBagConstraints attributes
        // refPlusType properties
        refPlusType = new JLabel("<html><h3>" + "Reference" + " - " + "Job Type" + " </h3><hr /></html>");
        GridBagConstraints refPlusTypeGC = new GridBagConstraints();
        refPlusTypeGC.gridwidth = GridBagConstraints.REMAINDER; // Number of colums occupied by component
        refPlusTypeGC.insets = new Insets(5, 10, 5, 10); // Specifies margin
        refPlusTypeGC.weightx = 1; // Required for anchor to work.
        refPlusTypeGC.anchor = GridBagConstraints.PAGE_START; // Position in container

        // addressLine1 properties
        addressLine1 = new JTextField(20);
        GridBagConstraints addressLine1GC = new GridBagConstraints();
        addressLine1GC.insets = new Insets(0, 10, 0, 10);
        addressLine1GC.fill = GridBagConstraints.HORIZONTAL; // Specifies component fill Horizontal space
        addressLine1GC.weightx = 1;
        addressLine1GC.weighty = 1;
        addressLine1GC.anchor = GridBagConstraints.NORTH;

        // Add components to this HALLogisticsDetailsPanel
        panel.add(refPlusType, refPlusTypeGC);
        panel.add(addressLine1, addressLine1GC);
        frame.add(panel);
        frame.setSize(600, 600);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                new TestJPanels().initUI();
            }
        });
    }
}

Answer 3

好的，我明白了。我不喜欢接受自己的答案，但我们走了。在一天结束的时候，我正试图让所有的东西在容器的顶部正确地聚集在一起。将weighty属性单独添加到所有组件意味着容器中的剩余空间在所有组件之间分配（相对于它们的weighty属性），因此将它们隔开。

答案似乎是通过向GridBagLayout中的最低组件添加weighty属性，剩余的剩余空间被分配到最低组件下方，因此将所有组件推送到顶部。默认情况下，当剩余空间根据其权重分配给组件时，它会被分配以下（至少在y轴上）。

以下是包含三个组件的新代码，以帮助演示;

    // Instantiate components and configure their corresponding GridBagConstraints attributes
    // refPlusType properties
    refPlusType = new JLabel("<html><h3>"+"Reference"+" - "+"Job Type"+" </h3><hr /></html>");
    refPlusTypeGC = new GridBagConstraints();
    refPlusTypeGC.gridx = 0; // Grid position 
    refPlusTypeGC.gridy = 0;
    refPlusTypeGC.gridwidth = 2; // Number of colums occupied by component
    refPlusTypeGC.insets = new Insets(5, 10, 5, 10); // Specifies margin

    // addressLine1 properties
    addressLine1 = new JTextField();
    addressLine1GC = new GridBagConstraints();
    addressLine1GC.gridx = 0; 
    addressLine1GC.gridy = 1;
    addressLine1GC.gridwidth = 2; 
    addressLine1GC.insets = new Insets(0, 10, 0, 10); 
    addressLine1GC.fill = GridBagConstraints.HORIZONTAL; // Specifies component fill Horizontal space

    // addressLine2 properties
    addressLine2 = new JTextField();
    addressLine2GC = new GridBagConstraints();
    addressLine2GC.gridx = 0; 
    addressLine2GC.gridy = 2;
    addressLine2GC.gridwidth = 2; 
    addressLine2GC.insets = new Insets(0, 10, 0, 10); 
    addressLine2GC.fill = GridBagConstraints.HORIZONTAL; // Specifies component fill Horizontal space 
    addressLine2GC.weighty = 1; // Required for anchor to work.
    addressLine2GC.anchor = GridBagConstraints.NORTH; // Position in container

    // Add components to this HALLogisticsDetailsPanel
    this.add(refPlusType, refPlusTypeGC);
    this.add(addressLine1, addressLine1GC);
    this.add(addressLine2, addressLine2GC);

Answer 4

最好的教程＆＃39;我见过的GridBagLayout是由Scott Stanchfield创建的。您可以在JavaOne 2001 here

中找到他提供的PowerPoint演示文稿的链接

曾经有一篇文章在线提供相同的信息，但它似乎被甲骨文吞没了。

请阅读有关GBL不理想的所有警告。如果您决定使用它，Scott会通过创建GUI的简单草图，为如何确定所有约束提供一个很好的视觉课程。

Jim S。

Java Swing GridBagLayout组件定位

4 个答案: