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POResize the panel without revalidation
 

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  1. POResize the panel without revalidation
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    <p>I have a<code>JPanel</code> in which I draw lines to create an illusion of pencil. This panel is in a<code>ScrollPane</code>.</p> <p>When I resize the panel one call to <code>revalidate()</code> method is automatically placed and all my drawn lines in this panel are gone. Is there any way to keep my drawn line in the panel with the new size ? <br><br></p> <pre><code>import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Point; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.AdjustmentEvent; import java.awt.event.AdjustmentListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JPanel; /** * * @author Sanjeev */ public class WorkArea extends JFrame implements ActionListener, MouseListener, MouseMotionListener { private final int PEN_OP = 1; private final int ERASER_OP = 2; private final int SCROLL_OP = 3; private int mousex = 0; private int mousey = 0; private int prevx = 0; private int prevy = 0; private boolean initialPen = true; private boolean initialEraser = true; private int eraserLength = 5; private int opStatus = PEN_OP; private Color mainColor = new Color(0,0,0); private int drawPanelHeight =1000; public WorkArea() { initComponents(); setLocationRelativeTo(null); pencilButton.addActionListener(this); eraserButton.addActionListener(this); drawPanel.addMouseMotionListener(this); drawPanel.addMouseListener(this); drawPanel.add(new TestPane()); this.addMouseListener(this); this.addMouseMotionListener(this); } private void initComponents() { headerPanel = new javax.swing.JPanel(); backButton = new javax.swing.JLabel(); headerImage = new javax.swing.JLabel(); controlPanel = new javax.swing.JPanel(); scrollButton = new javax.swing.JButton(); pencilButton = new javax.swing.JButton(); eraserButton = new javax.swing.JButton(); drawingPanel = new javax.swing.JPanel(); drawingScrollPane = new javax.swing.JScrollPane(); drawPanel = new javax.swing.JPanel(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); setTitle("v0.1"); setBackground(new java.awt.Color(237, 254, 255)); setBounds(new java.awt.Rectangle(0, 0, 513, 693)); setResizable(false); headerPanel.setBackground(new java.awt.Color(237, 254, 255)); headerPanel.setPreferredSize(new java.awt.Dimension(513, 25)); headerPanel.setLayout(null); backButton.setBackground(new java.awt.Color(237, 254, 255)); backButton.setFont(new java.awt.Font("Tahoma", 0, 10)); // NOI18N backButton.setForeground(new java.awt.Color(255, 255, 255)); backButton.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/back-arrow.png"))); // NOI18N backButton.setText("Back"); backButton.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER); backButton.setPreferredSize(new java.awt.Dimension(40, 20)); headerPanel.add(backButton); backButton.setBounds(0, 3, 40, 20); headerImage.setBackground(new java.awt.Color(237, 254, 255)); headerImage.setFont(new java.awt.Font("Tahoma", 1, 14)); // NOI18N headerImage.setForeground(new java.awt.Color(255, 255, 255)); headerImage.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/topbar_ipad_wide.png"))); // NOI18N headerImage.setText("Work Area"); headerImage.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER); headerImage.setPreferredSize(new java.awt.Dimension(513, 25)); headerPanel.add(headerImage); headerImage.setBounds(0, 0, 513, 25); controlPanel.setBackground(new java.awt.Color(237, 254, 255)); controlPanel.setPreferredSize(new java.awt.Dimension(90, 670)); controlPanel.setLayout(null); scrollButton.setBackground(new java.awt.Color(237, 254, 255)); scrollButton.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/up_down_ipad.png"))); // NOI18N scrollButton.setPreferredSize(new java.awt.Dimension(60, 60)); scrollButton.addMouseListener(new java.awt.event.MouseAdapter() { public void mouseClicked(java.awt.event.MouseEvent evt) { scrollButtonMouseClicked(evt); } }); controlPanel.add(scrollButton); scrollButton.setBounds(20, 570, 60, 60); pencilButton.setBackground(new java.awt.Color(237, 254, 255)); pencilButton.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/pencil_ipad.png"))); // NOI18N pencilButton.addMouseListener(new java.awt.event.MouseAdapter() { public void mouseClicked(java.awt.event.MouseEvent evt) { pencilButtonMouseClicked(evt); } }); controlPanel.add(pencilButton); pencilButton.setBounds(20, 450, 60, 60); eraserButton.setBackground(new java.awt.Color(237, 254, 255)); eraserButton.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/eraser_ipad.png"))); // NOI18N eraserButton.addMouseListener(new java.awt.event.MouseAdapter() { public void mouseClicked(java.awt.event.MouseEvent evt) { eraserButtonMouseClicked(evt); } }); controlPanel.add(eraserButton); eraserButton.setBounds(20, 510, 60, 60); drawingPanel.setBackground(new java.awt.Color(237, 254, 255)); drawingPanel.setPreferredSize(new java.awt.Dimension(420, 670)); drawingPanel.setLayout(null); drawingScrollPane.setBorder(null); drawingScrollPane.setPreferredSize(new java.awt.Dimension(423, 1000)); drawPanel.setBackground(new java.awt.Color(237, 254, 255)); drawPanel.setPreferredSize(new java.awt.Dimension(400, 1000)); drawPanel.setLayout(null); drawingScrollPane.setViewportView(drawPanel); drawingPanel.add(drawingScrollPane); drawingScrollPane.setBounds(0, 0, 424, 670); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 513, Short.MAX_VALUE) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(headerPanel, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 513, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addComponent(controlPanel, javax.swing.GroupLayout.PREFERRED_SIZE, 90, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(0, 423, Short.MAX_VALUE))) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() .addGap(0, 93, Short.MAX_VALUE) .addComponent(drawingPanel, javax.swing.GroupLayout.PREFERRED_SIZE, 420, javax.swing.GroupLayout.PREFERRED_SIZE))) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 693, Short.MAX_VALUE) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addComponent(headerPanel, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(0, 668, Short.MAX_VALUE))) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() .addGap(0, 23, Short.MAX_VALUE) .addComponent(controlPanel, javax.swing.GroupLayout.PREFERRED_SIZE, 670, javax.swing.GroupLayout.PREFERRED_SIZE))) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() .addGap(0, 23, Short.MAX_VALUE) .addComponent(drawingPanel, javax.swing.GroupLayout.PREFERRED_SIZE, 670, javax.swing.GroupLayout.PREFERRED_SIZE))) ); pack(); } @Override public void actionPerformed(ActionEvent e) { if (e.getActionCommand() == "Pen") opStatus = PEN_OP; if (e.getActionCommand() == "Eraser") opStatus = ERASER_OP; if(e.getActionCommand() == "Scroll") opStatus = SCROLL_OP; } private void pencilButtonMouseClickedTest(java.awt.event.MouseEvent evt) { opStatus = PEN_OP; Graphics g = drawPanel.getGraphics(); if (initialPen) { setGraphicalDefaults(evt); initialPen = false; g.drawLine(prevx,prevy,mousex,mousey); } if (mouseHasMoved(evt)) { mousex = evt.getX(); mousey = evt.getY(); g.drawLine(prevx,prevy,mousex,mousey); prevx = mousex; prevy = mousey; } } private void eraserButtonMouseClickedTest(java.awt.event.MouseEvent evt) { opStatus = ERASER_OP; Graphics g = drawPanel.getGraphics(); if (initialEraser) { setGraphicalDefaults(evt); initialEraser = false; mousex = evt.getX(); mousey = evt.getY(); System.out.println("Initial Eraser ::::::::x's value is : "+prevx+" , "+mousey+" and y's value is : "+mousex+" , "+mousey); g.setColor(new java.awt.Color(237,254,255)); g.fillRect(mousex-eraserLength, mousey-eraserLength,eraserLength*2,eraserLength*2); //g.setColor(Color.black); //Eraser Border g.drawRect(mousex-eraserLength,mousey-eraserLength,eraserLength*2,eraserLength*2); prevx = mousex; prevy = mousey; } if (mouseHasMoved(evt)) { System.out.println("Eraser ::::::::x's value is : "+prevx+" , "+mousey+" and y's value is : "+mousex+" , "+mousey); g.setColor(new java.awt.Color(237,254,255)); g.drawRect(prevx-eraserLength, prevy-eraserLength,eraserLength*2,eraserLength*2); mousex = evt.getX(); mousey = evt.getY(); /* Draw eraser block to panel */ g.setColor(new java.awt.Color(237,254,255)); g.fillRect(mousex-eraserLength, mousey-eraserLength,eraserLength*2,eraserLength*2); g.setColor(Color.black);//Eraser Border g.drawRect(mousex-eraserLength,mousey-eraserLength,eraserLength*2,eraserLength*2); prevx = mousex; prevy = mousey; } } private void scrollButtonMouseClicked(java.awt.event.MouseEvent evt) { opStatus = SCROLL_OP; drawingScrollPane.getVerticalScrollBar().addAdjustmentListener(new AdjustmentListener() { @Override public void adjustmentValueChanged(AdjustmentEvent e) { int extent,curValue; extent = drawingScrollPane.getVerticalScrollBar().getModel().getExtent(); curValue = drawingScrollPane.getVerticalScrollBar().getValue()+extent; if(curValue==drawPanel.getHeight()) { System.out.println("value of scroll equals to Max value...."); drawPanel.setPreferredSize(new Dimension(423,drawPanelHeight*4)); } System.out.println("Value: " + curValue + " Max: " + drawingScrollPane.getVerticalScrollBar().getMaximum()); } }); } private void eraserButtonMouseClicked(java.awt.event.MouseEvent evt) { eraserButtonMouseClickedTest(evt); updateMouseCoordinates(evt); } private void pencilButtonMouseClicked(java.awt.event.MouseEvent evt) { opStatus = PEN_OP; } public boolean mouseHasMoved(MouseEvent e) { return (mousex != e.getX() || mousey != e.getY()); } public void setGraphicalDefaults(MouseEvent e) { mousex = e.getX(); mousey = e.getY(); prevx = e.getX(); prevy = e.getY(); } @Override public void mouseDragged(MouseEvent e) { updateMouseCoordinates(e); switch (opStatus) { case PEN_OP : pencilButtonMouseClickedTest(e); break; case ERASER_OP: eraserButtonMouseClicked(e); break; case SCROLL_OP: scrollButtonMouseClicked(e); break; } } public void mouseReleased(MouseEvent e) { updateMouseCoordinates(e); switch (opStatus) { case PEN_OP : releasedPen(); break; case ERASER_OP : releasedEraser(); break; } } public void mouseEntered(MouseEvent e) { updateMouseCoordinates(e); } public void releasedPen() { initialPen = true; } public void releasedEraser() { initialEraser = true; Graphics g = drawPanel.getGraphics(); g.setColor(mainColor.white); g.drawRect(mousex-eraserLength,mousey-eraserLength,eraserLength*2,eraserLength*2); } public void updateMouseCoordinates(MouseEvent e) { String xCoor =""; String yCoor =""; if (e.getX() &lt; 0) xCoor = "0"; else { xCoor = String.valueOf(e.getX()); } if (e.getY() &lt; 0) xCoor = "0"; else { yCoor = String.valueOf(e.getY()); } } public static void main(String args[]) { try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(WorkArea.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(WorkArea.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(WorkArea.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(WorkArea.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new WorkArea().setVisible(true); } }); } private javax.swing.JLabel backButton; private javax.swing.JPanel controlPanel; private javax.swing.JPanel drawPanel; private javax.swing.JPanel drawingPanel; private javax.swing.JScrollPane drawingScrollPane; private javax.swing.JButton eraserButton; private javax.swing.JLabel headerImage; private javax.swing.JPanel headerPanel; private javax.swing.JButton pencilButton; private javax.swing.JButton scrollButton; @Override public void mouseClicked(MouseEvent e) { } @Override public void mouseExited(MouseEvent e) { updateMouseCoordinates(e); } @Override public void mouseMoved(MouseEvent e) { updateMouseCoordinates(e); } @Override public void mousePressed(MouseEvent e) { updateMouseCoordinates(e); } } </code></pre>
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    1. COWhich part of **Do not use component.getGraphics** is so hard to understand?
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    2. CO@kleopatra From component.getGraphics you'll not able to persist the drawing on the panel when some property like size changes !! For that you need to use paintComponent method. But this technique has its own limitations too !!
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    3. CO@kleopatra I think instead of pressing the +ve button you have pressed-ve button !
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