问题：

如何使用MigLayout将内容集中在多个面板上？

孟浩然

2023-03-14

我有一个大面板，其中包含3个较小的面板(LocationPanel、UsagePanel、StructuralAspectSpanel)。

每个较小的面板上都有一些JLabels和JCheckBoxes。我继续和中心的组件在每个面板上，但我如何完成中心他们在所有3个面板？（请看中间黑线）

我曾尝试在miglayout(new JLabel（“label here”），“cell0”）中使用cell-layout选项，但无法动态创建相同大小的间隙，从而使所有组件都居中。使用gap200(180，300，...)将组件“推入”视觉中心似乎是可行的，但我不想使用绝对定位/间隙，因为它们可能很容易断裂。

public class RiskAssessmentPage extends JPanel {
  JPanel riskAssessmentPanel = new JPanel();

  JPanel locationPanel = new JPanel();
  JPanel usagePanel = new JPanel();
  JPanel structuralAspectsPanel = new JPanel();

  public RiskAssessmentPage() {
    setLayout(new MigLayout(""));
    riskAssessmentPanel.setLayout(
        new MigLayout("wrap", "[grow, fill]", "[grow, fill, push][grow, fill, push][grow, fill, push]"));

    locationPanel.setLayout(new MigLayout("gap rel 2", "[grow, center][grow, left]"));
    locationPanel.setBorder(BorderFactory.createTitledBorder("Location"));

    usagePanel.setLayout(new MigLayout("gap rel 2", "[grow, center][grow, left]"));
    usagePanel.setBorder(BorderFactory.createTitledBorder("Usage"));

    structuralAspectsPanel.setLayout(new MigLayout("gap rel 2", "[grow, center][grow, left]"));
    structuralAspectsPanel.setBorder(BorderFactory.createTitledBorder("Structural Aspects"));

    locationPanel.add(new JLabel("This is the first of all labels"));
    locationPanel.add(new JCheckBox("Checkbox with Label"), "wrap");
    locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    locationPanel.add(new JSeparator(), "growx, span");
    locationPanel.add(new JLabel("Second Label"));
    locationPanel.add(new JCheckBox("Checkbox with Label"), "wrap");
    locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    locationPanel.add(new JSeparator(), "growx, span");
    locationPanel.add(new JLabel("This Label is fairly large and long and pushes the text around"));
    locationPanel.add(new JCheckBox("Checkbox with Label"), "wrap");
    locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");

    usagePanel.add(new JLabel("A label in the usage panel"));
    usagePanel.add(new JCheckBox("Checkbox with Label"), "wrap");
    usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    usagePanel.add(new JSeparator(), "growx, span");
    usagePanel.add(new JLabel("And another one and another one and another one"));
    usagePanel.add(new JCheckBox("Checkbox with Label"), "wrap");
    usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");

    structuralAspectsPanel.add(new JLabel("Label here"));
    structuralAspectsPanel.add(new JCheckBox("Checkbox with Label"), "wrap");
    structuralAspectsPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    structuralAspectsPanel.add(new JSeparator(), "growx, span");
    structuralAspectsPanel.add(new JLabel("I am so uncreative with label names..."));
    structuralAspectsPanel.add(new JCheckBox("Checkbox with Label"), "wrap");
    structuralAspectsPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    structuralAspectsPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    structuralAspectsPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    structuralAspectsPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    structuralAspectsPanel.add(new JSeparator(), "growx, span");
    structuralAspectsPanel.add(new JLabel("Thats it. I give up with naming them."));
    structuralAspectsPanel.add(new JCheckBox("Checkbox with Label"), "wrap");
    structuralAspectsPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
    structuralAspectsPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");

    riskAssessmentPanel.add(locationPanel);
    riskAssessmentPanel.add(usagePanel);
    riskAssessmentPanel.add(structuralAspectsPanel);

    add(riskAssessmentPanel, "grow, push");
  }
}

共有1个答案

公良鸿风

2023-03-14

为了使面板列对齐，您需要将它们设置为相同的大小。在miglayout中，您可以通过将第一列的首选大小和增长率设置为与所有面板中的值相同来完成此操作。例如

panel1.new MigLayout("", //Unchanged Layout Constraints
        "[:500, grow, center][grow, left]", //Column Constraints
        ""); //Unchanged Row Constraints

panel2.new MigLayout("", //Unchanged Layout Constraints
        "[:500, grow, center][grow, left]", //Column Constraints
        ""); //Unchanged Row Constraints

在本例中，panel1和panel2第一列的首选大小都设置为500，增长设置为默认值，因此也是相同的。

这里可以看到所描述的一个工作示例

import java.awt.*;
import javax.swing.*;
import net.miginfocom.swing.MigLayout;

public class MigLay extends JFrame {

    private MigLay() {
        super("Button Layout");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new MigLayout("wrap", //Layout Constraints
        "grow, fill", //Column Constraints
        "grow, fill")); //Row Constraints
        createPanels();
        pack();
        setMinimumSize(getSize()); //Sets minimum size to the preferred size. Remove or change this line if you do not want that to happen
        setVisible(true);
    }

    private void createPanels() {

        JPanel locationPanel = new JPanel();
        JPanel usagePanel = new JPanel();
        JPanel structuralAspectsPanel = new JPanel();

        //JLabels for font metrics
        JLabel one = new JLabel("This is the first of all labels");
        JLabel two = new JLabel("Second Label");
        JLabel three = new JLabel("This Label is fairly large and long and pushes the text around");
        JLabel four = new JLabel("A label in the usage panel");
        JLabel five = new JLabel("And another one and another one and another one");

        //Font Metrics
        FontMetrics metrics = three.getFontMetrics(three.getFont()); //Take longest label manually or dynamically (You will have to add that code)
        int width = metrics.stringWidth(three.getText());

        locationPanel.setLayout(new MigLayout("gap rel 2", "[:" + width + ", grow, center][grow, left]"));
        locationPanel.setBorder(BorderFactory.createTitledBorder("Location"));

        usagePanel.setLayout(new MigLayout("gap rel 2", "[:" + width + ", grow, center][grow, left]"));
        usagePanel.setBorder(BorderFactory.createTitledBorder("Usage"));

        locationPanel.add(one);
        locationPanel.add(new JCheckBox("Checkbox with Label"), "wrap");
        locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
        locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
        locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
        locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
        locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
        locationPanel.add(new JSeparator(), "growx, span");
        locationPanel.add(two);
        locationPanel.add(new JCheckBox("Checkbox with Label"), "wrap");
        locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
        locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
        locationPanel.add(new JSeparator(), "growx, span");
        locationPanel.add(three);
        locationPanel.add(new JCheckBox("Checkbox with Label"), "wrap");
        locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
        locationPanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");

        usagePanel.add(four);
        usagePanel.add(new JCheckBox("Checkbox with Label"), "wrap");
        usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
        usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
        usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
        usagePanel.add(new JSeparator(), "growx, span");
        usagePanel.add(five);
        usagePanel.add(new JCheckBox("Checkbox with Label"), "wrap");
        usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
        usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
        usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
        usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
        usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");
        usagePanel.add(new JCheckBox("Checkbox with Label"), "skip, wrap");

        getContentPane().add(locationPanel);
        getContentPane().add(usagePanel);
    }

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

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如何使用MigLayout将内容集中在多个面板上？

共有1个答案

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