組件運行繪畫

Question

所以，我在我的程序的KeyListener。一旦它被激活，它就會在屏幕上繪製另一個組件。

會發生什麼是最新的組件被在一個地方畫在屏幕上它不應該是對還是錯尺寸（只是一秒鐘），然後捕捉到它的指定位置和大小，一切看起來不錯。

有沒有辦法來指導我的程序計算元件的位置和尺寸繪製它在屏幕上，以避免閃爍之前？

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.InputEvent; 
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.sql.Array; 
import java.util.ArrayList; 
import java.util.Locale; 
import java.util.Properties; 
import java.util.ResourceBundle; 

import javax.swing.BorderFactory; 
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.JTextArea; 
import javax.swing.KeyStroke; 
import javax.swing.border.Border; 
import javax.swing.text.AbstractDocument; 
import javax.swing.text.AttributeSet; 
import javax.swing.text.BadLocationException; 
import javax.swing.text.DocumentFilter; 



@SuppressWarnings("serial") 
class DefaultFont extends Font 
{ 
    public DefaultFont() 
    { 
     super("Arial", PLAIN, 20); 
    } 
} 


@SuppressWarnings("serial") 
class Page extends JPanel 
{ 
    public JPanel largePage; 
    public int content; 

    public Page(JPanel panel, int index) 
    { 
     largePage = new JPanel(); 
     largePage.setLayout(new BoxLayout(largePage, BoxLayout.Y_AXIS)); 
     largePage.setMaximumSize(new Dimension(794, 1123)); 
     largePage.setPreferredSize(new Dimension(794, 1123)); 
     largePage.setAlignmentX(Component.CENTER_ALIGNMENT); 
     largePage.setBackground(Color.WHITE); 
     largePage.add(new Box.Filler(new Dimension(0, 96), new Dimension(0, 96), new Dimension(0, 96))); 

     setMaximumSize(new Dimension(556, 931)); 
     setBackground(Color.LIGHT_GRAY); 
     setLayout(new BoxLayout(this, BoxLayout.Y_AXIS)); 
     add(new Box.Filler(new Dimension(556, 0), new Dimension(556, 931), new Dimension(556, 931))); 

     largePage.add(this); 
     largePage.add(new Box.Filler(new Dimension(0, 96), new Dimension(0, 96), new Dimension(0, 96))); 

     panel.add(largePage, index); 
     panel.add(new Box.Filler(new Dimension(0, 40), new Dimension(0, 40), new Dimension(0, 40))); 

     content = 0; 

     Main.pages.add(this); 
    } 
} 

@SuppressWarnings("serial") 
class Heading extends JTextArea 
{ 
    public boolean type; 
    public AbstractDocument doc; 
    public ArrayList<JPanel/*Question*/> questions; 
    public ArrayList<JPanel/*List*/> list; 

    public Heading(boolean segment, Page page) 
    { 
     type = segment; 

     setBackground(Color.RED); 
     setFont(new Font("Arial", Font.BOLD, 20)); 

     Border in = BorderFactory.createDashedBorder(Color.BLACK); 
     Border out = BorderFactory.createMatteBorder(0, 0, 10, 0, Color.WHITE); 

     setBorder(BorderFactory.createCompoundBorder(out, in)); 
     setLineWrap(true); 
     setWrapStyleWord(true); 

     setText("Heading 1 Heading 1 Heading 1 Heading 1"); 

     doc = (AbstractDocument)this.getDocument(); 
     doc.setDocumentFilter(new DocumentFilter() 
     { 
      public void insertString(FilterBypass fb, int offs,String str, AttributeSet a) throws BadLocationException 
      { 
       if ((fb.getDocument().getLength() + str.length()) <= 100) 
       { 
        ; 
        fb.insertString(offs, str.replaceAll("\n", " "), a); 
       } 
       else 
       { 
        int spaceLeft = 100 - fb.getDocument().getLength(); 
        if (spaceLeft <= 0) 
         return; 

        fb.insertString(offs, str.substring(0,spaceLeft).replaceAll("\n", " "), a); 
       } 
      } 

      public void replace(FilterBypass fb, int offs, int length, String str, AttributeSet a) throws BadLocationException 
      { 
       if (str.equals("\n")) 
       { 
        str = ""; 
       } 
       if ((fb.getDocument().getLength() + str.length() - length) <= 100) 
       { 
        fb.replace(offs, length, str.replaceAll("\n", " "), a); 
       } 
       else 
       { 
        int spaceLeft = 100 - fb.getDocument().getLength() + length; 
        if (spaceLeft <= 0) 
         return; 

        fb.replace(offs, length, str.substring(0,spaceLeft).replaceAll("\n", " "), a); 
       } 
      } 
     }); 

     page.add(this, 0); 
     page.content++; 

     if (type) 
     { 
      questions = new ArrayList<JPanel>(); 
     } 
     else 
     { 
      list = new ArrayList<JPanel>(); 
     } 
    } 
} 

@SuppressWarnings("serial") 
class Question extends JPanel 
{ 
    public JPanel questionArea, numberArea, answerArea; 
    public JLabel number; 
    public JTextArea question; 
    public AbstractDocument doc; 

    public Question(Page page, int pageNum, int index) 
    { 
     setLayout(new BoxLayout(this, BoxLayout.Y_AXIS)); 
     setBorder(BorderFactory.createMatteBorder(0, 0, 5, 0, Color.WHITE)); 

     questionArea = new JPanel(); 
     questionArea.setLayout(new BoxLayout(questionArea, BoxLayout.X_AXIS)); 
     questionArea.setBorder(BorderFactory.createMatteBorder(0, 0, 8, 0, Color.WHITE)); 

     numberArea = new JPanel(); 
     numberArea.setLayout(new BorderLayout()); 
     numberArea.setBackground(Color.WHITE); 

     number = new JLabel(pageNum+". ", JLabel.RIGHT); 
     number.setMinimumSize(new Dimension(100, 20)); 
     number.setPreferredSize(new Dimension(100, 20)); 
     number.setMaximumSize(new Dimension(100, 20)); 
     number.setFont(new Font("Arial", Font.PLAIN, 17)); 

     numberArea.add(number, BorderLayout.NORTH); 

     questionArea.add(numberArea); 

     question = new JTextArea(); 
     question.setFont(new Font("Arial", Font.PLAIN, 17)); 
     question.setBorder(BorderFactory.createDashedBorder(Color.BLACK)); 
     question.setLineWrap(true); 
     question.setWrapStyleWord(true); 
     question.setBackground(Color.GREEN); 

     question.setText("Is this the first question?"); 

     doc = (AbstractDocument)question.getDocument(); 
     doc.setDocumentFilter(new DocumentFilter() 
     { 
      public void insertString(FilterBypass fb, int offs,String str, AttributeSet a) throws BadLocationException 
      { 
       if ((fb.getDocument().getLength() + str.length()) <= 200) 
       { 
        ; 
        fb.insertString(offs, str.replaceAll("\n", " "), a); 
       } 
       else 
       { 
        int spaceLeft = 200 - fb.getDocument().getLength(); 
        if (spaceLeft <= 0) 
         return; 

        fb.insertString(offs, str.substring(0,spaceLeft).replaceAll("\n", " "), a); 
       } 
      } 

      public void replace(FilterBypass fb, int offs, int length, String str, AttributeSet a) throws BadLocationException 
      { 
       if (str.equals("\n")) 
       { 
        str = ""; 
       } 
       if ((fb.getDocument().getLength() + str.length() - length) <= 200) 
       { 
        fb.replace(offs, length, str.replaceAll("\n", " "), a); 
       } 
       else 
       { 
        int spaceLeft = 200 - fb.getDocument().getLength() + length; 
        if (spaceLeft <= 0) 
         return; 

        fb.replace(offs, length, str.substring(0,spaceLeft).replaceAll("\n", " "), a); 
       } 
      } 
     }); 

     questionArea.add(question); 

     add(questionArea); 

     answerArea = new JPanel(); 
     answerArea.setLayout(new BoxLayout(answerArea, BoxLayout.Y_AXIS)); 

     add(answerArea); 

     page.add(this, index); 
     page.content++; 
    } 
} 

@SuppressWarnings("serial") 
class Answer extends JPanel 
{ 
    public JPanel letterArea; 
    public JLabel letter; 
    public JTextArea answer; 
    public char[] letters = {'a', 'b', 'c', 'd', 'e' }; 
    public AbstractDocument doc; 

    public Answer(Question q, int index) 
    { 
     setLayout(new BoxLayout(this, BoxLayout.X_AXIS)); 


     letterArea = new JPanel(); 
     letterArea.setLayout(new BorderLayout()); 
     letterArea.setBackground(Color.WHITE); 

     letter = new JLabel(letters[index-1]+") ", JLabel.RIGHT); 
     letter.setMinimumSize(new Dimension(150, 20)); 
     letter.setPreferredSize(new Dimension(150, 20)); 
     letter.setMaximumSize(new Dimension(150, 20)); 
     letter.setFont(new Font("Arial", Font.PLAIN, 17)); 

     letterArea.add(letter, BorderLayout.NORTH); 

     add(letterArea); 

     answer = new JTextArea(); 
     answer.setFont(new Font("Arial", Font.PLAIN, 17)); 

     Border in = BorderFactory.createDashedBorder(Color.BLACK); 
     Border out = BorderFactory.createMatteBorder(0, 0, 5, 0, Color.WHITE); 

     answer.setBorder(BorderFactory.createCompoundBorder(out, in)); 
     answer.setLineWrap(true); 
     answer.setWrapStyleWord(true); 

     answer.addKeyListener(new KeyListener() 
     { 
      @Override 
      public void keyPressed(KeyEvent arg0) 
      { 
       new Answer((Question) ((JTextArea) arg0.getSource()).getParent().getParent().getParent(), 2); 
       Main.mWindow.repaint(); 
       Main.mWindow.validate(); 
      } 

      public void keyReleased(KeyEvent arg0) {} 

      public void keyTyped(KeyEvent arg0) {} 

     }); 

     doc = (AbstractDocument)answer.getDocument(); 
     doc.setDocumentFilter(new DocumentFilter() 
     { 
      public void insertString(FilterBypass fb, int offs,String str, AttributeSet a) throws BadLocationException 
      { 
       if ((fb.getDocument().getLength() + str.length()) <= 200) 
       { 
        ; 
        fb.insertString(offs, str.replaceAll("\n", " "), a); 
       } 
       else 
       { 
        int spaceLeft = 200 - fb.getDocument().getLength(); 
        if (spaceLeft <= 0) 
         return; 

        fb.insertString(offs, str.substring(0,spaceLeft).replaceAll("\n", " "), a); 
       } 
      } 

      public void replace(FilterBypass fb, int offs, int length, String str, AttributeSet a) throws BadLocationException 
      { 
       if (str.equals("\n")) 
       { 
        str = ""; 
       } 
       if ((fb.getDocument().getLength() + str.length() - length) <= 200) 
       { 
        fb.replace(offs, length, str.replaceAll("\n", " "), a); 
       } 
       else 
       { 
        int spaceLeft = 200 - fb.getDocument().getLength() + length; 
        if (spaceLeft <= 0) 
         return; 

        fb.replace(offs, length, str.substring(0,spaceLeft).replaceAll("\n", " "), a); 
       } 
      } 
     }); 

     answer.setBackground(Color.PINK); 
     add(answer); 
     q.answerArea.add(this, index-1); 
    } 
} 



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; 


    public static void newDocumentForm() 
    { 
     //new document dialog 
     mWindow.setEnabled(false); 

     newDoc = new JDialog(mWindow, "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("newDocText1"); 
     newDocText1.setBounds(5, 0, 400, 20); 

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

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

     firstSegment = true; 

     questions = new JRadioButton("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("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("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); 

     //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>(); 

     Page p = new Page(workspace, 1); 

     new Heading(true, p); 

     Question q = new Question(p, 1, 1); 

     new Answer(q, 1); 

     mWindow.add(scroll, BorderLayout.CENTER); 
     mWindow.repaint(); 
     mWindow.validate(); 

    } 

    public static void main(String[] args) throws FileNotFoundException, IOException 
    { 

     //create main window 
     mWindow = new JFrame("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); 

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

     menuFile = new JMenu("file"); 
     menuEdit = new JMenu("edit"); 

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

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

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

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

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


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

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

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

     itmProperties = new JMenuItem("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(); 
    } 
} 

這不是SSCCE（這是一整套相互依存的組成部分，在新的程序複製這將是頸項強痛，甚至可能不是短得多），但在回答類發生整件事。你幾乎可以忽略其他任何東西。

P.S.要獲取事物按Ctrl + n，然後輸入！ 然後在粉紅色的textarea的，只是按下一個按鈕...

P.P.S.如果您認爲按鈕，可以得到非常酷的效果... ...：d

Answer 1

你可能需要在KeyListenervalidate()和然後repaint()。 Key bindings可能是更好的方法。