Java 网格布局和最小宽度_Java_Swing_Gridbaglayout

Java 网格布局和最小宽度

java swing

Java 网格布局和最小宽度,java,swing,gridbaglayout,Java,Swing,Gridbaglayout,我想使面板具有受约束的最大宽度，但当容器变短时，它会减小其宽度我使用了GridBagLayout，但当大小变得足够短时，它的行为会很奇怪 import java.awt.Color; import java.awt.Dimension; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JFrame; import javax.swing.JPanel; /** *

我想使面板具有受约束的最大宽度，但当容器变短时，它会减小其宽度

我使用了GridBagLayout，但当大小变得足够短时，它的行为会很奇怪

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

import javax.swing.JFrame;
import javax.swing.JPanel;

/**
 * @author Michael Nesterenko
 *
 */
public class SSCE extends JFrame {

    /**
     * 
     */
    public SSCE() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        GridBagLayout gbl = new GridBagLayout();
        gbl.columnWidths = new int[] {200, 1};
        gbl.columnWeights = new double[] {0, 1};
        gbl.rowHeights = new int[] {10};
        gbl.rowWeights = new double[] {0};
        setLayout(gbl);

        GridBagConstraints gbc = new GridBagConstraints();
        gbc.fill = GridBagConstraints.HORIZONTAL;

        JPanel sizeRestrictedPanel = new JPanel();
        sizeRestrictedPanel.setBackground(Color.BLUE);
        sizeRestrictedPanel.setMinimumSize(new Dimension(50, 50));
        sizeRestrictedPanel.setMaximumSize(new Dimension(300, 50));
        sizeRestrictedPanel.setPreferredSize(new Dimension(300, 50));
        add(sizeRestrictedPanel, gbc);

        JPanel dummy = new JPanel();
        dummy.setBackground(Color.RED);
        add(dummy, gbc);

        setPreferredSize(new Dimension(600, 200));
        pack();
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        new SSCE().setVisible(true);
    }

}

当框架宽度变得足够短时，蓝色面板将立即调整大小，但我希望它能够随着窗口大小的调整而平滑调整大小。

您可以定义GridBagConstraints.ipadx和GridBagConstraints.ipady约束以设置最小宽度/高度

/**
 * This field specifies the internal padding of the component, how much
 * space to add to the minimum width of the component. The width of
 * the component is at least its minimum width plus
 * <code>ipadx</code> pixels.
 * <p>
 * The default value is <code>0</code>.
 * @serial
 * @see #clone()
 * @see java.awt.GridBagConstraints#ipady
 */
public int ipadx;

/**
 * This field specifies the internal padding, that is, how much
 * space to add to the minimum height of the component. The height of
 * the component is at least its minimum height plus
 * <code>ipady</code> pixels.
 * <p>
 * The default value is 0.
 * @serial
 * @see #clone()
 * @see java.awt.GridBagConstraints#ipadx
 */
public int ipady;

可以定义GridBagConstraints.ipadx和GridBagConstraints.ipady约束来设置最小宽度/高度

/**
 * This field specifies the internal padding of the component, how much
 * space to add to the minimum width of the component. The width of
 * the component is at least its minimum width plus
 * <code>ipadx</code> pixels.
 * <p>
 * The default value is <code>0</code>.
 * @serial
 * @see #clone()
 * @see java.awt.GridBagConstraints#ipady
 */
public int ipadx;

/**
 * This field specifies the internal padding, that is, how much
 * space to add to the minimum height of the component. The height of
 * the component is at least its minimum height plus
 * <code>ipady</code> pixels.
 * <p>
 * The default value is 0.
 * @serial
 * @see #clone()
 * @see java.awt.GridBagConstraints#ipadx
 */
public int ipady;

当用户缩小窗口宽度时，首先只有红色面板收缩

问题中的代码示例实际上是从一个扩展窗口开始的，该窗口超出了打包组件所给出的大小。如果我们删除行集合PreferredSizeNew Dimension600、200；然后我们得到如下所示的窗口，而不是一个带有扩展的红色面板的窗口。如果我们将宽度减小到小于此大小，那么我们将强制蓝色面板小于其首选大小，并且其行为异常。这是因为GridBagLayout不再支持蓝色面板的首选尺寸，它现在为每个面板提供了相等的空间，并尝试满足其最小尺寸

我建议不要在GridBagLayout中使用setPreferredSize。您可能希望确定窗口仍然有用所需的最小尺寸，并且不允许用户将大小减小到该最小值以下。当用户展开窗口时，某些组件所占用的空间不应超过最初分配的空间。我们可以使用GridBagConstraints weightx和weighty而不是setMaximumSize来实现这一点

下面的代码显示了两个面板的平滑调整，我添加了一些文本来显示尺寸

import java.awt.*;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import javax.swing.*;

/**
 * @author Michael Nesterenko, Leon LaSpina
 *
 */
public class SSCE extends JFrame {
   JLabel blueDimension, redDimension;
   JPanel sizeRestrictedPanel, dummyPanel, bottomPanel;

   public SSCE() {
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      JPanel testPanel = new JPanel();
      bottomPanel = new JPanel();
      setLayout(new BorderLayout());
      GridBagLayout gbl = new GridBagLayout();
      testPanel.setLayout(gbl);
      add(testPanel, BorderLayout.CENTER);
      add(bottomPanel, BorderLayout.SOUTH);
      GridBagConstraints gbc = new GridBagConstraints();
      gbc.fill = GridBagConstraints.HORIZONTAL;
      gbc.weightx = 0.75;

      sizeRestrictedPanel = new JPanel();
      sizeRestrictedPanel.setBackground(Color.BLUE);
      sizeRestrictedPanel.setMinimumSize(new Dimension(50, 50));
      sizeRestrictedPanel.setMaximumSize(new Dimension(300, 50));
      //sizeRestrictedPanel.setPreferredSize(new Dimension(300, 50));
      testPanel.add(sizeRestrictedPanel, gbc);
      dummyPanel = new JPanel();
      dummyPanel.setBackground(Color.RED);
      dummyPanel.setMinimumSize(new Dimension(50, 50));
      //dummyPanel.setPreferredSize(new Dimension(50, 50));
      gbc.weightx = 0.25;
      testPanel.add(dummyPanel, gbc);

      setSize(new Dimension(600, 200));
      blueDimension = new JLabel("------");
      blueDimension.setForeground(Color.BLUE);
      redDimension = new JLabel("------");
      redDimension.setForeground(Color.RED);
      bottomPanel.add(blueDimension);
      bottomPanel.add(new JLabel("   "));
      bottomPanel.add(blueDimension);
      bottomPanel.add(redDimension);
      this.addComponentListener(new ComponentAdapter() {
         public void componentResized(ComponentEvent e) {
            updateDimensionText();
         }
      });
   }

   private void updateDimensionText() {
      Dimension d1 = sizeRestrictedPanel.getSize();
      String s1 = d1.width + "," + d1.height;
      Dimension d2 = dummyPanel.getSize();
      String s2 = d2.width + "," + d2.height;
      blueDimension.setText(s1);
      redDimension.setText(s2);
   }

   /**
    * @param args
    */
   public static void main(String[] args) {
      SSCE win = new SSCE();
      win.setVisible(true);
      win.updateDimensionText();
   }
}

当用户缩小窗口宽度时，首先只有红色面板收缩

下面的代码显示了两个面板的平滑调整，我添加了一些文本来显示尺寸

import java.awt.*;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import javax.swing.*;

/**
 * @author Michael Nesterenko, Leon LaSpina
 *
 */
public class SSCE extends JFrame {
   JLabel blueDimension, redDimension;
   JPanel sizeRestrictedPanel, dummyPanel, bottomPanel;

   public SSCE() {
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      JPanel testPanel = new JPanel();
      bottomPanel = new JPanel();
      setLayout(new BorderLayout());
      GridBagLayout gbl = new GridBagLayout();
      testPanel.setLayout(gbl);
      add(testPanel, BorderLayout.CENTER);
      add(bottomPanel, BorderLayout.SOUTH);
      GridBagConstraints gbc = new GridBagConstraints();
      gbc.fill = GridBagConstraints.HORIZONTAL;
      gbc.weightx = 0.75;

      sizeRestrictedPanel = new JPanel();
      sizeRestrictedPanel.setBackground(Color.BLUE);
      sizeRestrictedPanel.setMinimumSize(new Dimension(50, 50));
      sizeRestrictedPanel.setMaximumSize(new Dimension(300, 50));
      //sizeRestrictedPanel.setPreferredSize(new Dimension(300, 50));
      testPanel.add(sizeRestrictedPanel, gbc);
      dummyPanel = new JPanel();
      dummyPanel.setBackground(Color.RED);
      dummyPanel.setMinimumSize(new Dimension(50, 50));
      //dummyPanel.setPreferredSize(new Dimension(50, 50));
      gbc.weightx = 0.25;
      testPanel.add(dummyPanel, gbc);

      setSize(new Dimension(600, 200));
      blueDimension = new JLabel("------");
      blueDimension.setForeground(Color.BLUE);
      redDimension = new JLabel("------");
      redDimension.setForeground(Color.RED);
      bottomPanel.add(blueDimension);
      bottomPanel.add(new JLabel("   "));
      bottomPanel.add(blueDimension);
      bottomPanel.add(redDimension);
      this.addComponentListener(new ComponentAdapter() {
         public void componentResized(ComponentEvent e) {
            updateDimensionText();
         }
      });
   }

   private void updateDimensionText() {
      Dimension d1 = sizeRestrictedPanel.getSize();
      String s1 = d1.width + "," + d1.height;
      Dimension d2 = dummyPanel.getSize();
      String s2 = d2.width + "," + d2.height;
      blueDimension.setText(s1);
      redDimension.setText(s2);
   }

   /**
    * @param args
    */
   public static void main(String[] args) {
      SSCE win = new SSCE();
      win.setVisible(true);
      win.updateDimensionText();
   }
}

setXxXSize方法的使用也可能是罪魁祸首。如果您可以提供一个小的图像，准确地描述您对结果的期望，这将是非常有用的：-@nIcEcOw，我希望在框架窗口足够大时，蓝色面板具有一定的限制宽度，但当窗口变短时，蓝色面板不再适合任何其他颜色，蓝色面板的宽度将变为等于窗口的宽度，并平滑地调整大小。目前它只是跳转到一些较小的值。请看一下，看看这是否与您的情况相似。对于Tigy的大小，你可以考虑使用并附加到你的蓝色JPANELL中，使用SETXXXSIZE方法也可能是罪魁祸首。如果您可以提供一个小的图像，准确地描述您对结果的期望，这将是非常有用的：-@nIcEcOw，我希望在框架窗口足够大时，蓝色面板具有一定的限制宽度，但当窗口变短时，蓝色面板不再适合任何其他颜色，蓝色面板的宽度将变为等于窗口的宽度，并平滑地调整大小。目前它只是跳转到一些较小的值。请看一下，看看这是否与您的情况相似。对于THYGY的大小，您可以考虑使用并附加到您的蓝色J面板上。