How to maintain the Central Position during resizing

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  Edited by: anIdiot July 27, 2011 22:01

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  I have a window (frame) that has three panels - upper, middle and lower. When the window is narrowed down, I need a scroll bar is displayed for the central panel only. If the maximum possible vertical shrinkage would be the sum of the upper and lower panels and a small amount (to display the scroll bar of the central panel). So the upper and lower panels should always be completely (height wise). Please review my code and suggest corrections. I tried the couple in different ways, but without success... The code below is my latest attempt.
  Thank you...
  

  import java.awt.*;
  import java.awt.Color.*;
  import java.awt.event.MouseEvent;
  import java.awt.event.MouseListener;
  import java.awt.event.MouseMotionListener;
  
  import javax.swing.*;
  import javax.swing.plaf.ComponentUI;
  
  public class PanelResizingA extends JPanel implements MouseListener, MouseMotionListener
  {
  
       /**
        * @param args
        */
       public static void main(String[] args)
       {
            JFrame frame = new JFrame ("All Panels");
            PanelResizingA allThreePanels = new PanelResizingA();
            JScrollPane allHorizontalScroll = new JScrollPane();
            //frame.add(allHorizontalScroll);
            allHorizontalScroll.setViewportView(allThreePanels);
            allHorizontalScroll.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
            allHorizontalScroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER);
            frame.getContentPane().add(allHorizontalScroll);
            frame.setVisible(true);
            frame.pack();
       }
       
       private JPanel topPanel;
       private JPanel midPanel;
       private JPanel bottomPanel;
       private JPanel allPanels;
       private JScrollPane midVerticalScroll;
       private JScrollPane allHorizontalScroll;
       private JLabel posnCheckLabel;
       private int panelWidth = 0;
       private int topPanelHt = 0;
       private int midPanelHt = 0;
       private int bottomPanelHt = 0;
       private int allPanelsHt = 0;
       private Point pointPressed;
       private Point pointReleased;
       
       public PanelResizingA()
       {
            createAllPanels();
       }
       
       private void createAllPanels()
       {
            topPanel = new JPanel();
            midPanel = new JPanel();
            bottomPanel = new JPanel();
            allPanels = new JPanel();
            posnCheckLabel = new JLabel("Label in Center");
            
            panelWidth = 300;
            topPanelHt = 150;
            midPanelHt = 200;
            bottomPanelHt = 150;
            allPanelsHt = topPanelHt + midPanelHt + bottomPanelHt;
            
            //topPanel.setMinimumSize(new Dimension(panelWidth-150, topPanelHt));
            //topPanel.setMaximumSize(new Dimension(panelWidth, topPanelHt));
            topPanel.setPreferredSize(new Dimension(panelWidth, topPanelHt));
            topPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
            
            midPanel.setMinimumSize(new Dimension(panelWidth-150, midPanelHt-150));
            midPanel.setMaximumSize(new Dimension(panelWidth, midPanelHt));
            midPanel.setPreferredSize(new Dimension(panelWidth, midPanelHt-3));
            midPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
            midPanel.setLayout(new BorderLayout());
            midPanel.add(posnCheckLabel, BorderLayout.CENTER);
            //midPanel.add(new PanelVerticalDragger(midPanel), BorderLayout.SOUTH);
            
            //bottomPanel.setMinimumSize(new Dimension(panelWidth-150, bottomPanelHt));
            //bottomPanel.setMaximumSize(new Dimension(panelWidth, bottomPanelHt));
            bottomPanel.setPreferredSize(new Dimension(panelWidth, bottomPanelHt));
            bottomPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
            
            allPanels.setMinimumSize(new Dimension (panelWidth-150, allPanelsHt-300));
            allPanels.setMaximumSize(new Dimension(panelWidth+25, allPanelsHt+25));
            allPanels.setPreferredSize(new Dimension(panelWidth, allPanelsHt));
            
            midVerticalScroll = new JScrollPane();
            //midPanel.add(midVerticalScroll);
            midVerticalScroll.setViewportView(midPanel);
            midVerticalScroll.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
            midVerticalScroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED);
  
            allPanels.setLayout(new BoxLayout(allPanels,BoxLayout.Y_AXIS));
            allPanels.add(topPanel);
            allPanels.add(midPanel);
            allPanels.add(bottomPanel);
            
            this.add(allPanels);
            addMouseListener(this);
            addMouseMotionListener(this);
       }
       private void updateCursor(boolean on)
       {
            if (on)
            {
                 setCursor(Cursor.getPredefinedCursor(Cursor.S_RESIZE_CURSOR));
            }
            else
            {
                 setCursor(null);
            }
       }
       @Override
       public void mousePressed(MouseEvent e)
       {
            pointPressed = e.getLocationOnScreen();
            updateCursor(true);
       }
  
       @Override
       public void mouseDragged(MouseEvent e)
       {
            mouseReleased(e);
            pointPressed = e.getLocationOnScreen();
       }
  
       @Override
       public void mouseReleased(MouseEvent e)
       {
            pointReleased = e.getLocationOnScreen();
            
            Dimension allPanelsPrefSize = this.allPanels.getPreferredSize();
            Dimension midPanelPrefSize = this.midPanel.getPreferredSize();
            Dimension allPanelsSize = this.allPanels.getSize();
            Dimension allPanelsMinSize = this.allPanels.getMinimumSize();
            int midPanelPrefHt = midPanelPrefSize.height;
            int midPanelPrefWidth = midPanelPrefSize.width;
            int maxHtDelta = allPanelsPrefSize.height - allPanelsMinSize.height;
            //int deltaY = pointPressed.y - pointReleased.y;
            
            Point panelLocation = this.getLocation();
            Dimension size = this.getSize();
            if (size.height < allPanelsSize.height)
            {
                 int deltaY = pointPressed.y - pointReleased.y;
                 if (deltaY < maxHtDelta)
                 {
                      midPanelPrefHt = midPanelPrefHt-deltaY;
                 }
                 else {midPanelPrefHt = this.midPanel.getMinimumSize().height;}
                 this.midPanel.setPreferredSize(new Dimension(midPanelPrefWidth, midPanelPrefHt));
                 this.midVerticalScroll.setViewportView(this.midPanel);
                 allPanels.setLayout(new BoxLayout(allPanels,BoxLayout.Y_AXIS));
                 allPanels.add(topPanel);
                 allPanels.add(midVerticalScroll);
                 allPanels.add(bottomPanel);               
            }
            midVerticalScroll.revalidate();
            pointPressed = null;
            pointReleased = null;
       }
  
       @Override
       public void mouseEntered(MouseEvent e)
       {
            updateCursor(true);
       }
  
       @Override
       public void mouseExited(MouseEvent e)
       {
       }
  
       @Override
       public void mouseClicked(MouseEvent e)
       {
       }
  
       @Override
       public void mouseMoved(MouseEvent e)
       {
       }
       
       
  }

  Published by: 799076 on October 8, 2010 12:53
  
  Published by: 799076 on October 8, 2010 12:55

  If you are using a BorderLayout, then Center will develop and reduce both the need and therefore should work as you wish. For example,.

  import java.awt.BorderLayout;
  import java.awt.Dimension;
  import javax.swing.*;
  
  public class PanelResizingB extends JPanel {
     private static final Dimension PANEL_SIZE = new Dimension(300, 150);
     private String[] labelStrings = {"Top Panel", "Middle Panel", "Bottom Panel"};
  
     public PanelResizingB() {
        setLayout(new BorderLayout());
  
        JPanel[] panels = new JPanel[labelStrings.length];
        for (int i = 0; i < panels.length; i++) {
           panels[i] = new JPanel(new BorderLayout());
           panels.add(new JLabel(labelStrings[i]));panels[i].setPreferredSize(PANEL_SIZE);}
  
  add(panels[0], BorderLayout.NORTH);add(new JScrollPane(panels[1]), BorderLayout.CENTER);add(panels[2], BorderLayout.SOUTH);}
  
  private static void createAndShowUI() {JFrame frame = new JFrame("PanelResizingB");frame.getContentPane().add(new PanelResizingB());frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.pack();frame.setLocationRelativeTo(null);frame.setVisible(true);}
  
  public static void main(String[] args) {java.awt.EventQueue.invokeLater(new Runnable() {public void run() {createAndShowUI();}});}} 
  

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• How to disable the close button during execution

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• How to find the center position on the screen!

  Hello

  I used Manager introduced absolute, where I have to insert a button on the center of the screen associated with x position. But I have not discovered the interms exact position width display and the width of the image of Mr. as I have to support many devices I m not able to determine the precise position. One thing that I see is image to a device resolution changes to... It's really the culprit...  Can any one gyide me in the right direction!

  You can get the resolution using http://www.blackberry.com/developers/docs/7.1.0api/net/rim/device/api/system/Display.html#getHorizon...

  Maybe you can share the code you are using?
  I would just try Display.getWidth/2-image.width/2 for x.