JScrollPane滾動問題

-1

我創建了一個具有JScrollPane的程序。然而，JScrollPane似乎沒有做到應有的。雖然組件的尺寸大於JScrollPane，但它不會滾動。JScrollPane滾動問題

從我的程序中生成一個SSCCE會讓人頭疼，所以我只會給你帶有重要地方評論標記的整個程序。（重要和結束重要）任何評論不應影響該問題。

啓動程序時，在對話框中單擊文件>新建，然後單擊確定。這將畫出有問題的GUI。

P.S.在這裏只有高度是重要的，寬度方面一切正常。

package core; 

import java.awt.BorderLayout; 
import java.awt.Color; 
import java.awt.Component; 
import java.awt.Dimension; 
import java.awt.Font; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.awt.event.KeyEvent; 
import java.awt.event.KeyListener; 
import java.awt.event.WindowEvent; 
import java.awt.event.WindowListener; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.IOException; 
import java.util.ArrayList; 
import java.util.Locale; 
import java.util.Properties; 
import java.util.ResourceBundle; 

import javax.swing.Box; 
import javax.swing.BoxLayout; 
import javax.swing.ButtonGroup; 
import javax.swing.JButton; 
import javax.swing.JDialog; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JMenu; 
import javax.swing.JMenuBar; 
import javax.swing.JMenuItem; 
import javax.swing.JPanel; 
import javax.swing.JRadioButton; 
import javax.swing.JScrollPane; 
import javax.swing.KeyStroke; 

//IMPORTANT! 
@SuppressWarnings("serial") 
class Page extends JPanel 
{ 
public int content; 

public Page(JPanel panel, int index) 
{ 
    setMaximumSize(new Dimension(794, 1123)); 
    setAlignmentX(Component.CENTER_ALIGNMENT); 
    setBackground(Color.WHITE); 

    panel.add(this, index); 

    content = 0; 
} 
} 
/END OF IMPORTANT! 

public class Main 
{ 

public static Properties config; 
public static Locale currentLocale; 
public static ResourceBundle lang; 

public static JFrame mWindow; 

public static JMenuBar menu; 
public static JMenu menuFile, menuEdit; 
public static JMenuItem itmNew, itmClose, itmLoad, itmSave, itmSaveAs, itmExit, itmCut, itmCopy, itmPaste, itmProperties; 

public static JDialog newDoc; 
public static JLabel newDocText1, newDocText2; 
public static JRadioButton questions, list; 
public static ButtonGroup newDocButtons; 
public static JButton newDocOk; 
public static Boolean firstSegment; 

public static JPanel workspace; 
public static JScrollPane scroll; 
public static ArrayList<Page> pages; 

//IGNORE WHOLE METHOD, HAS NOTHING TO DO WITH THE PROBLEM 
public static void newDocumentForm() 
{ 
    //new document dialog 
    mWindow.setEnabled(false); 

    newDoc = new JDialog(mWindow, lang.getString("newDoc")); 
    newDoc.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE); 
    newDoc.addWindowListener(new WindowListener() 
    { 
     public void windowActivated(WindowEvent arg0) {} 
     public void windowClosing(WindowEvent arg0) 
     { 
      mWindow.toFront(); 

      newDocText1 = null; 
      newDocText2 = null; 
      questions = null; 
      list = null; 
      newDocButtons = null; 
      newDocOk = null; 
      newDoc.dispose(); 

      mWindow.setEnabled(true);    
     } 

     public void windowClosed(WindowEvent arg0) {} 
     public void windowDeactivated(WindowEvent arg0) {} 
     public void windowDeiconified(WindowEvent arg0) {} 
     public void windowIconified(WindowEvent arg0) {} 
     public void windowOpened(WindowEvent arg0) {} 
    }); 

    newDoc.setSize(400, 200); 
    newDoc.setLocationRelativeTo(null); 
    newDoc.setResizable(false); 
    newDoc.setLayout(null); 
    newDoc.setVisible(true); 

    newDocText1 = new JLabel(lang.getString("newDocText1")); 
    newDocText1.setBounds(5, 0, 400, 20); 

    newDocText2 = new JLabel(lang.getString("newDocText2")); 
    newDocText2.setBounds(5, 20, 400, 20); 

    newDoc.add(newDocText1); 
    newDoc.add(newDocText2); 

    firstSegment = true; 

    questions = new JRadioButton(lang.getString("questions")); 
    questions.setSelected(true); 
    questions.setFocusPainted(false); 
    questions.setBounds(10, 60, 400, 20); 
    questions.addActionListener(new ActionListener() 
    { 
     public void actionPerformed(ActionEvent arg0) 
     { 
      firstSegment = true; 
     } 
    }); 

    list = new JRadioButton(lang.getString("list")); 
    list.setFocusPainted(false); 
    list.setBounds(10, 80, 400, 20); 
    list.addActionListener(new ActionListener() 
    { 
     public void actionPerformed(ActionEvent arg0) 
     { 
      firstSegment = false; 
     } 
    }); 

    newDoc.add(questions); 
    newDoc.add(list); 

    newDocButtons = new ButtonGroup(); 
    newDocButtons.add(questions); 
    newDocButtons.add(list); 

    newDocOk = new JButton(lang.getString("ok")); 
    newDocOk.addKeyListener(new KeyListener() 
    { 
     public void keyPressed(KeyEvent e) 
     { 
      if (e.getKeyCode() == KeyEvent.VK_ENTER) 
      { 
       newDocOk.doClick(); 
      } 
     } 

     public void keyReleased(KeyEvent e) {} 
     public void keyTyped(KeyEvent e) {} 
    }); 

    newDocOk.setFocusPainted(false); 
    newDocOk.setBounds(160, 120, 80, 40); 
    newDocOk.setMnemonic(KeyEvent.VK_ACCEPT); 
    newDocOk.addActionListener(new ActionListener() 
    { 
     public void actionPerformed(ActionEvent arg0) 
     { 
      createNewDocument(); 
     } 
    }); 

    newDoc.add(newDocOk); 
    newDocOk.requestFocus(); 
} 

public static void createNewDocument() 
{ 
    //dispose of new document dialog 
    mWindow.toFront(); 

    newDocText1 = null; 
    newDocText2 = null; 
    questions = null; 
    list = null; 
    newDocButtons = null; 
    newDocOk = null; 
    newDoc.dispose(); 

    mWindow.setEnabled(true); 

      //IMPORTANT! 
    //create document display    
    workspace = new JPanel(); 
    workspace.setLayout(new BoxLayout(workspace, BoxLayout.PAGE_AXIS)); 
    workspace.add(new Box.Filler(new Dimension(0, 40), new Dimension(0, 40), new Dimension(0, 40))); 
    workspace.setBackground(Color.BLACK); 

    scroll = new JScrollPane(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER); 
    scroll.getVerticalScrollBar().setUnitIncrement(20); 
    scroll.setViewportView(workspace); 

    pages = new ArrayList<Page>(); 

    @SuppressWarnings("unused") 
    Page p = new Page(workspace, 1); 


    mWindow.add(scroll, BorderLayout.CENTER); 
    mWindow.repaint(); 
    mWindow.validate(); 
} 
    //END OF IMPORTANT 

public static void main(String[] args) throws FileNotFoundException, IOException 
{ 
    //load properties 
    config = new Properties(); 
    config.load(new FileInputStream("src\\config.properties")); 

    //load language 
    currentLocale = new Locale(config.getProperty("language"), config.getProperty("country")); 
    lang = ResourceBundle.getBundle("language", currentLocale); 

      //IMPORTANT! 
    //create main window 
    mWindow = new JFrame(lang.getString("title")); 
    mWindow.setSize(1000, 800); 
    mWindow.setMinimumSize(new Dimension(1000, 800)); 
    mWindow.setLocationRelativeTo(null); 
    mWindow.setLayout(new BorderLayout()); 
    mWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

    mWindow.setVisible(true); 
      //END OF IMPORTANT 

    //create menu bar 
    menu = new JMenuBar(); 

    menuFile = new JMenu(lang.getString("file")); 
    menuEdit = new JMenu(lang.getString("edit")); 

    itmNew = new JMenuItem(lang.getString("new")); 
    itmNew.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, ActionEvent.CTRL_MASK)); 
    itmNew.addActionListener(new ActionListener() 
    { 
     public void actionPerformed(ActionEvent e) 
     { 
      newDocumentForm(); 
     } 
    }); 

    itmClose = new JMenuItem(lang.getString("close")); 
    itmClose.setActionCommand("Close"); 
    itmClose.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_W, ActionEvent.CTRL_MASK)); 

    itmLoad = new JMenuItem(lang.getString("load")); 
    itmLoad.setActionCommand("Load"); 
    itmLoad.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_L, ActionEvent.CTRL_MASK)); 

    itmSave = new JMenuItem(lang.getString("save")); 
    itmSave.setActionCommand("Save"); 
    itmSave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, ActionEvent.CTRL_MASK)); 

    itmSaveAs = new JMenuItem(lang.getString("saveAs")); 
    itmSaveAs.setActionCommand("SaveAs"); 
    itmExit = new JMenuItem(lang.getString("exit")); 
    itmExit.addActionListener(new ActionListener() 
    { 
     public void actionPerformed(ActionEvent e) 
     { 
      //Add confirmation window! 
      System.exit(0); 
     } 
    }); 


    itmCut = new JMenuItem(lang.getString("cut")); 
    itmCut.setActionCommand("Cut"); 
    itmCut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, ActionEvent.CTRL_MASK)); 

    itmCopy = new JMenuItem(lang.getString("copy")); 
    itmCopy.setActionCommand("Copy"); 
    itmCopy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, ActionEvent.CTRL_MASK)); 

    itmPaste = new JMenuItem(lang.getString("paste")); 
    itmPaste.setActionCommand("Paste"); 
    itmPaste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, ActionEvent.CTRL_MASK)); 

    itmProperties = new JMenuItem(lang.getString("properties")); 
    itmProperties.setActionCommand("properties"); 
    itmProperties.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_P, ActionEvent.CTRL_MASK)); 

    menuFile.add(itmNew); 
    menuFile.add(itmClose); 
    menuFile.addSeparator(); 
    menuFile.add(itmLoad); 
    menuFile.addSeparator(); 
    menuFile.add(itmSave); 
    menuFile.add(itmSaveAs); 
    menuFile.addSeparator(); 
    menuFile.add(itmExit); 

    menuEdit.add(itmCut); 
    menuEdit.add(itmCopy); 
    menuEdit.add(itmPaste); 
    menuEdit.addSeparator(); 
    menuEdit.add(itmProperties); 

    menu.add(menuFile); 
    menu.add(menuEdit); 

    //create actionListener for menus 



    mWindow.add(menu, BorderLayout.NORTH); 

    mWindow.repaint(); 
    mWindow.validate(); 
} 
}

來源

2012-08-28 John Smith

-1不學習......（關於話題：Do.Not.Use.Null.Layout.Nor.SetXXSize） – kleopatra

你設置視面板的最大尺寸，同時JScollPane檢查preferred size。

setPreferredSize(new Dimension(794, 1123));

來源

2012-08-28 12:32:36 dacwe

問題解決了，但我想面板有固定witdh與這一點，擴大了它的整個父母... –

沒關係，明白了，我設定了兩個。 –

JScrollPane滾動問題

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