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当使用JLabel的setText（）时，GUI会改变所有内容

2015-11-15 24 views
0

当我更改我的JLabel的文本时，我的整个GUI元素定位都会改变。我是GUI新手，所以我的知识仅限于它在做什么。当使用JLabel的setText（）时，GUI会改变所有内容

package GUI; 

import javax.swing.*; 

import com.tri_voltage.md.util.Tools; 

import java.awt.*; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 

public class GUI extends JFrame { 
    /** 
    * 
    */ 
    private static final long serialVersionUID = 1L; 
    JButton b1 = new JButton("1"),b2=new JButton("2"),b3=new JButton("3"),b4=new JButton("4"),b5=new JButton("5"),b6=new JButton("6"); 
    JLabel l1= new JLabel("Label 1"),l2= new JLabel("Label 2"),l3=new JLabel("Label 3"),l4=new JLabel("Label 4"),l5=new JLabel("Label 5"),l6=new JLabel("Label 6"); 
    JPanel mainPane = new JPanel(), adminPane = new JPanel(), messagePane=new JPanel(); 
    JLayeredPane layeredPane = new JLayeredPane(); 
    private final int HEIGHT_0 = 0,HEIGHT_1=30,HEIGHT_2=60; 
    private final int JBUTTON_WIDTH = 100,JBUTTON_HEIGHT = 25,JBUTTON_RIGHT = 305,JBUTTON_LEFT = 0; 
    private final int JLABEL_WIDTH =50,JLABEL_HEIGHT =25,JLABEL_LEFT=0,JLABEL_RIGHT=150; 
    private final int JPANEL_WIDTH = 1000,JPANEL_HEIGHT=1000; 

    public GUI() { 
     load(); 
    } 
    public void load() { 
     setTitle("Employee Console"); 
     setSize(JPANEL_WIDTH,JPANEL_HEIGHT); 

     setVisible(true); 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     mainPane = Tools.createPanel(0, 0, JPANEL_WIDTH, 700, new GridBagLayout()); 
     adminPane = Tools.createPanel(0, 700, JPANEL_WIDTH, 300, "Admin Console", new GridBagLayout()); 
     messagePane = Tools.createPanel(105, 0, 200, 90, new GridBagLayout()); 
     loadButtons(); 
     loadLabels(); 
     layeredPane.setPreferredSize(new Dimension(1000,1000)); 
     layeredPane.setSize(1000, 1000); 
     add(layeredPane); 
     //refresh(); 
    } 
    public void loadButtons() { 
     GridBagConstraints constraints = new GridBagConstraints(); 

     constraints.anchor = GridBagConstraints.CENTER; 
     constraints.fill = GridBagConstraints.HORIZONTAL; 
     constraints.weightx = 0.12; 
     constraints.gridx = 2; 
     constraints.ipady = 0; 
     constraints.ipadx = 0; 

     b1 = Tools.createButton(JBUTTON_LEFT, 0, JBUTTON_WIDTH, JBUTTON_HEIGHT, "Button 1", new ButtonListener(this)); 
     b2 = Tools.createButton(JBUTTON_LEFT, 30, JBUTTON_WIDTH, JBUTTON_HEIGHT, "Button 2", new ButtonListener(this)); 
     b3 = Tools.createButton(JBUTTON_LEFT, 60, JBUTTON_WIDTH, JBUTTON_HEIGHT, "Button 3", new ButtonListener(this)); 
     b4 = Tools.createButton(JBUTTON_RIGHT, 0, JBUTTON_WIDTH, JBUTTON_HEIGHT, "Button 4", new ButtonListener(this)); 
     b5 = Tools.createButton(JBUTTON_RIGHT, 30, JBUTTON_WIDTH, JBUTTON_HEIGHT, "Button 5", new ButtonListener(this)); 
     b6 = Tools.createButton(JBUTTON_RIGHT, 60, JBUTTON_WIDTH, JBUTTON_HEIGHT, "Button 6", new ButtonListener(this)); 
     mainPane.add(b1); 
     mainPane.add(b2); 
     mainPane.add(b3); 
     mainPane.add(b4); 
     mainPane.add(b5); 
     mainPane.add(b6); 
     layeredPane.add(mainPane,1); 
    } 

    public void loadLabels() { 
     l1 = Tools.createLabel(JLABEL_LEFT,HEIGHT_0, JLABEL_WIDTH, JLABEL_HEIGHT, l1.getText()); 
     l2 = Tools.createLabel(JLABEL_LEFT,HEIGHT_1, JLABEL_WIDTH, JLABEL_HEIGHT, l2.getText()); 
     l3 = Tools.createLabel(JLABEL_LEFT,HEIGHT_2, JLABEL_WIDTH, JLABEL_HEIGHT, l3.getText()); 
     l4 = Tools.createLabel(JLABEL_RIGHT,HEIGHT_0, JLABEL_WIDTH, JLABEL_HEIGHT, l4.getText()); 
     l5 = Tools.createLabel(JLABEL_RIGHT,HEIGHT_1, JLABEL_WIDTH, JLABEL_HEIGHT, l5.getText()); 
     l6 = Tools.createLabel(JLABEL_RIGHT,HEIGHT_2, JLABEL_WIDTH, JLABEL_HEIGHT, l6.getText()); 
     messagePane.add(l1); 
     messagePane.add(l2); 
     messagePane.add(l3); 
     messagePane.add(l4); 
     messagePane.add(l5); 
     messagePane.add(l6); 
     layeredPane.add(messagePane,0); 
    } 
    public void refresh() { 
     repaint(); 
    } 
    public void actionPerformed(ActionEvent e) { 
     switch (e.getActionCommand()) { 

     } 
    } 

} 

class ButtonListener implements ActionListener { 
    private final GUI gui; 
    private String screen = "main"; 


    ButtonListener(GUI gui) { 
     this.gui = gui; 
    } 

    @Override 
    public void actionPerformed(ActionEvent e) { 
     switch (e.getActionCommand()) { 
      case "Button 1": 
       JOptionPane.showMessageDialog(new JFrame(),"Button 1 has been pressed!"); 
       break; 

      case "Button 2": 
       gui.l1.setText(null); 
       break; 

     } 
    } 
}

工具：

package com.tri_voltage.md.util; 

import java.awt.Color; 
import java.awt.Font; 
import java.awt.LayoutManager; 
import java.awt.Toolkit; 
import java.awt.event.ActionListener; 
import java.awt.event.KeyListener; 
import java.io.BufferedReader; 
import java.io.File; 
import java.io.FileReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.LineNumberReader; 

import javax.swing.BorderFactory; 
import javax.swing.ImageIcon; 
import javax.swing.JButton; 
import javax.swing.JCheckBox; 
import javax.swing.JComboBox; 
import javax.swing.JComponent; 
import javax.swing.JLabel; 
import javax.swing.JMenu; 
import javax.swing.JMenuBar; 
import javax.swing.JMenuItem; 
import javax.swing.JPanel; 
import javax.swing.JTextField; 
import javax.swing.event.MenuListener; 

import com.tri_voltage.md.util.MediaType; 

public class Tools { 

    private final static Font defaultFont = new Font("Verdana", Font.PLAIN, 15); 

    private final static ImageIcon defaultImageIcon = null;//TODO: Find a suitable image icon 

    public static ImageIcon loadMediaTypeImageIcon(String type) { 
     return loadMediaTypeImageIcon(MediaType.valueOf(type)); 
    } 

    public static ImageIcon loadMediaTypeImageIcon(MediaType type) { 
     return loadImageIcon(type.getImagePath()); 
    } 

    public static ImageIcon loadImageIcon(String path) { 
     if (path.equalsIgnoreCase("NONE")) 
      return defaultImageIcon; 
     return new ImageIcon(Toolkit.getDefaultToolkit().createImage(ClassLoader.getSystemResource(path))); 
    } 

    public static String readLine(InputStream stream, long lineNumber) { 
     try { 
      BufferedReader reader = new BufferedReader(new InputStreamReader(stream)); 
      for (long l = 0; l < lineNumber; l ++) 
       reader.readLine(); 
      String line = reader.readLine(); 
      return line; 
     } catch (IOException e) { 
      e.printStackTrace(); 
      return null; 
     } 
    } 

    /** 
    * Gets the last line number within the file (fileLocation) that is being called. 
    * @param fileLocation 
    * @return The last line number of the file. <b>(NOTE: Keep in mind that the first line number of a file is 0!)</b> 
    * @throws IOException 
    */ 
    public static int getLastLineNumber(String location) { 
     try { 
      @SuppressWarnings("resource") 
      LineNumberReader lnr = new LineNumberReader(new FileReader(new File(location))); 
      lnr.skip(9223372036854775807L); 
      return lnr.getLineNumber(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
      return 0; 
     } 
    } 

    public static JPanel createPanel(int x, int y, int width, int height, String title, LayoutManager layout, JComponent... components) { 
     JPanel panel = createPanel(x, y, width, height, layout); 
     if (title != null || title != "") 
      panel.setBorder(BorderFactory.createTitledBorder(title)); 
     if (components != null) 
      for (JComponent component : components) 
       if (component != null) 
        panel.add(component); 
     return panel; 
    } 

    public static JPanel createPanel(int x, int y, int width, int height, LayoutManager layout, JComponent... components) { 
     JPanel panel = createPanel(x, y, width, height, layout); 
     if (components != null) 
      for (JComponent component : components) 
       if (component != null) 
        panel.add(component); 
     return panel; 
    } 

    public static JPanel createPanel(int x, int y, int width, int height, LayoutManager layout) { 
     JPanel panel = new JPanel(); 
     panel.setLayout(layout); 
     panel.setBounds(x, y, width, height); 
     return panel; 
    } 

    public static JButton createButton(int x, int y, int width, int height, String title, ActionListener listener) { 
     JButton button = new JButton(); 
     if (title == null || title == "") 
      button.setText("Button"); 
     else 
      button.setText(title); 
     button.setBounds(x, y, width, height); 
     if (listener != null) 
      button.addActionListener(listener); 
     return button; 
    } 

    public static JTextField createTextField(int x, int y, int width, int height, String actionCommand, KeyListener keyListener, ActionListener actionListener) { 
     JTextField textField = new JTextField(); 
     textField.setBounds(x, y, width, height); 
     if (keyListener != null) 
      textField.addKeyListener(keyListener); 
     if (actionListener != null) 
      textField.addActionListener(actionListener); 
     if (actionCommand != null) 
      textField.setName(actionCommand); 
     return textField; 
    } 

    public static JTextField createTextField(int x, int y, int width, int height, String actionCommand, KeyListener listener) { 
     JTextField textField = new JTextField(); 
     textField.setBounds(x, y, width, height); 
     if (listener != null) 
      textField.addKeyListener(listener); 
     if (actionCommand != null) 
      textField.setName(actionCommand); 
     return textField; 
    } 

    public static JCheckBox createCheckBox(int x, int y, int width, int height, String name, ActionListener listener) { 
     JCheckBox checkBox = new JCheckBox(name); 
     checkBox.setBounds(x, y, width, height); 
     if (listener != null) 
      checkBox.addActionListener(listener); 
     return checkBox; 
    } 

    public static JComboBox<String> createComboBox(int x, int y, int width, int height, String actionCommand, String[] options, ActionListener listener) { 
     JComboBox<String> comboBox = new JComboBox<String>(options); 
     comboBox.setBounds(x, y, width, height); 
     if (actionCommand != null) 
      comboBox.setActionCommand(actionCommand); 
     return comboBox; 
    } 

    public static JLabel createLabel(int x, int y, int width, int height, String title, Color background, Color foreground) { 
     JLabel label = createLabel(x, y, width, height, title, background); 
     label.setForeground(foreground); 
     return label; 
    } 

    public static JLabel createLabel(int x, int y, int width, int height, String title, Color background) { 
     JLabel label = createLabel(x, y, width, height, title); 
     label.setBackground(background); 
     return label; 
    } 

    public static JLabel createLabel(int x, int y, int width, int height, String title) { 
     JLabel label = new JLabel(); 
     if (title != null || title != "") 
      label.setText(title); 
     label.setBounds(x, y, width, height); 
     return label; 
    } 

    public static JMenu createMenu(String name, JMenuBar parent, MenuListener listener) { 
     JMenu menu = new JMenu(name); 
     menu.addMenuListener(listener); 
     parent.add(menu); 
     return menu; 
    } 

    public static JMenu createMenu(String name, JMenuBar parent) { 
     return createMenu(name, parent, null); 
    } 

    public static JMenuItem createMenuItem(String name, JMenu parent, ActionListener listener) { 
     JMenuItem item = new JMenuItem(name); 
     item.addActionListener(listener); 
     parent.add(item); 
     return item; 
    } 

    /** 
    * @return the defaultfont 
    */ 
    public static Font getDefaultfont() { 
     return defaultFont; 
    } 

}

这里有附照片： 按钮2按下前： enter image description here

按钮2被按下后： enter image description here

来源

2015-11-15 Matthew

+2

1）Tools类中包含什么代码？ 2）考虑阅读Swing布局经理。 –

+0

如果标签尺寸太大，您是否需要调整按钮尺寸？我想象标签不能超过相邻的标签或类似标签。 – Coffee

+1

咖啡，我将它改为完全相同的文字，而且什么也没有发生，同样的事情发生。 – Matthew

回答

0

您应该使用一些容器像布局和添加元素。这确保元素是固定的。如果你没有使用任何容器，那么在调整所有元素的大小时不会随着它调整大小。这也是这里的问题。当标签尺寸发生变化时，整个内容都会受到影响。

只是看到这个链接了解更多关于学习布局。

http://www.tutorialspoint.com/swing/swing_layouts.htm

来源

2015-11-15 17:53:15

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