How to get only the central panel to resize and display a scroll bar?

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();}});}}

Tags: Java

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How to get only the central panel to resize and display a scroll bar?

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