如何设置固定的列宽

如何设置固定的列宽

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GridBagLayout的：如何设置固定的列宽？

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问题描述

我一直试图设置在以下code固定列宽的年龄......的事情是，当我的标签添加到面板左侧，则宽度自动递增......我想列的宽度是固定的...

谁能帮帮我好吗？

这是code：

 进口java.awt.AWTException;
进口java.awt.BorderLayout中;
进口java.awt.Color中;
进口java.awt.Cursor中;
进口java.awt.Dimension中;
进口java.awt.Graphics;
进口java.awt.Graphics2D中;
进口java.awt.GridBagConstraints中;
进口java.awt.GridBagLayout中;
进口java.awt.Image中;
进口java.awt.Panel;
进口java.awt.Point中;
进口java.awt.Robot中;
进口java.awt.Toolkit中;
进口java.awt.event.ActionEvent中;
进口java.awt.event.ActionListener;
进口java.awt.event.KeyEvent中;
进口java.awt.event.KeyListener;
进口java.awt.event.MouseEvent中;
进口java.awt.event.MouseListener;
进口java.io.BufferedReader中;
进口java.io.BufferedWriter中;
进口java.io.ByteArrayInputStream中;
进口java.io.ByteArrayOutputStream中;
进口的java.io.File;
进口java.io.FileInputStream中;
进口java.io.FileNotFoundException;
进口java.io.FileOutputStream中;
进口java.io.FileReader;
进口java.io.FileWriter;
进口java.io.IOException异常;
进口的java.util.ArrayList;
进口的java.util.Calendar;
进口java.util.Timer中;
进口java.util.TimerTask中;进口javax.sound.sampled.AudioFileFormat;
进口javax.sound.sampled.AudioFormat中;
进口javax.sound.sampled.AudioInputStream中;
进口javax.sound.sampled.AudioSystem;
进口javax.sound.sampled.DataLine中;
进口javax.sound.sampled.LineUnavailableException;
进口javax.sound.sampled.TargetDataLine;
进口javax.swing.BorderFactory中;
进口javax.swing.ImageIcon中;
进口javax.swing.JButton中;
进口javax.swing.JFrame中;
进口javax.swing.JLabel中;
进口javax.swing.JPanel中;
进口javax.swing.SwingUtilities中;
进口javax.swing.border.Border;进口java.io.IOException异常;公共类CURRENTITEM继承JPanel {    私有静态的JFrame currentScreen;    公共CURRENTITEM（JFrame的P）{        GridBagConstraints的C =新的GridBagConstraints（）;        // TODO Borramos阙罗哈亚EN LA pantalla
        this.removeAll（）;
        this.revalidate（）;        currentScreen = P;        this.setBackground（Color.LIGHT_GRAY）;        this.setLayout（新的GridBagLayout（））;        currentScreen.add（本）;        // ---＆GT;
        面板leftPanel =新面板（）;
        leftPanel.setBackground（Color.BLACK）;        c.weightx = 1.5;
        c.weighty = 1;
        //c.fill = GridBagConstraints.BOTH;
        this.add（leftPanel，C）;
        //＆LT; ---        // ---＆GT;
        面板secondPanel =新面板（）;
        secondPanel.setBackground（Color.green）;        c.weightx = 0.25;
        c.weighty = 1;
        c.fill = GridBagConstraints.BOTH;        this.add（secondPanel，C）;
        //＆LT; ---        // ---＆GT;
        面板rightPanel =新面板（）;
        rightPanel.setBackground（Color.CYAN）;        c.weightx = 1.5;
        c.weighty = 1;
        c.fill = GridBagConstraints.BOTH;        this.add（rightPanel，C）;
        //＆LT; ---        currentScreen.setVisible（真）;        this.requestFocusInWindow（）;
    }
}


解决方案

的GridBagLayout 放置在一个网格的矩形（单元）的组件，然后使用组件的 preferred尺寸的决定细胞应为多大。

权重来确定如何分配列之间的空间（的weightx ）和行（分量）之间;这对于指定调整行为很重要。

通常权重以0.0和1.0的极端指定：在之间的数目被用作必要

了解更多

样code：（低于code设置固定宽度列用100％的垂直尺寸）

 面板leftPanel =新面板（）{
    @覆盖
    公共尺寸的get preferredSize（）{
        返回新的Dimension（...，...）;
    }
};

删除的weightx 的第一列，并覆盖的get preferredSize（）方法。

  leftPanel.setBackground（Color.BLACK）;c.weighty = 1;
c.fill = GridBagConstraints.VERTICAL;
this.add（leftPanel，C）;

I've been trying to set fixed column width in the following code for ages...The thing is that when I add a label to the panel on the left, then the width is incremented automatically...and i Would like the column width to be fixed...

Could anyone help me please??

This is the code: 

import java.awt.AWTException;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Image;
import java.awt.Panel;
import java.awt.Point;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;

import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.TargetDataLine;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.border.Border;

import java.io.IOException;

public class CurrentItem extends JPanel{

    private static JFrame currentScreen;

    public CurrentItem(JFrame p) {

        GridBagConstraints c = new GridBagConstraints();

        //Borramos todo lo que haya en la pantalla
        this.removeAll();
        this.revalidate();

        currentScreen = p;

        this.setBackground(Color.LIGHT_GRAY);

        this.setLayout(new GridBagLayout());

        currentScreen.add(this);

        // --->
        Panel leftPanel = new Panel();
        leftPanel.setBackground(Color.BLACK);

        c.weightx = 1.5;
        c.weighty = 1;
        //c.fill = GridBagConstraints.BOTH;
        this.add(leftPanel, c);
        // <---

        // --->
        Panel secondPanel = new Panel();
        secondPanel.setBackground(Color.green);

        c.weightx = 0.25;
        c.weighty = 1;
        c.fill = GridBagConstraints.BOTH;

        this.add(secondPanel, c);
        // <---

        // --->
        Panel rightPanel = new Panel();
        rightPanel.setBackground(Color.CYAN);

        c.weightx = 1.5;
        c.weighty = 1;
        c.fill = GridBagConstraints.BOTH;

        this.add(rightPanel, c);
        // <---

        currentScreen.setVisible(true);

        this.requestFocusInWindow();
    }
}
解决方案

GridBagLayout places components in rectangles (cells) in a grid, and then uses the components' preferred sizes to determine how big the cells should be.

Weights are used to determine how to distribute space among columns (weightx) and among rows (weighty); this is important for specifying resizing behavior.

Generally weights are specified with 0.0 and 1.0 as the extremes: the numbers in between are used as necessary.

Read more How to Use GridBagLayout

Sample code: (below code set fixed width column with 100% vertical size.)

Panel leftPanel = new Panel() {
    @Override
    public Dimension getPreferredSize() {
        return new Dimension(..., ...);
    }
};

Remove weightx for first column and override getPreferredSize() method.

leftPanel.setBackground(Color.BLACK);

c.weighty = 1;
c.fill = GridBagConstraints.VERTICAL;
this.add(leftPanel, c);

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08-13 07:07
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