Resizing component in JScrollPane

Hi!
I want to do the following: when the button pressed, resize the component(JPanel) inside the JScrollPane.
I tried the following code:
jPanel1.setPreferredSize(new Dimension(400, 300));
jScrollPane1.getViewport().add(jPanel1, null);
void jButton1_actionPerformed(ActionEvent e)
jPanel1.setPreferredSize(new Dimension(4000, 3000));
When I press the button, nothing happens.
Please help.

Thank you, Stas, but it didn't work. Now my code is:
void jButton1_actionPerformed(ActionEvent e)
jPanel1.setPreferredSize(new Dimension(4000, 3000));
((Component)jScrollPane1).invalidate();
jScrollPane1.validate();
jScrollPane1.repaint();
I expected my horizontal and vertical bars to change ( the sign that the panel's size changed), but they didn't.

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public class ResizeComponent extends javax.swing.JFrame {
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Here's the code:
package test;
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try changing these lines
mainPanel.add(tablePanel, BorderLayout.CENTER);
mainPanel.add(buttonPanel, BorderLayout.EAST);
this.setContentPane(mainPanel);
to this
mainPanel.add(buttonPanel, BorderLayout.EAST);
getContentPane().add(scrollPane, BorderLayout.CENTER);
getContentPane().add(mainPanel, BorderLayout.EAST);

How to resize component dynamically?

I customized a LCD component extended from JLabel. It has two type of dimension, i.e.
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Please tell me the answer, thank you!
public void setModelSize(int xCells, int yCells) {
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I tested this code which resize tab pane when the tab is double clicked.
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I've also created a custom component.
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1. My only success was that ComponentEvent.SHOW seems to
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then you may recalculate the bounds and adjust the
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import java.awt.event.*;
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}Especially when you zoom in, you can get an unpleasant dislocation.

ScrollBar of JScrollbar repaint continuesly ... Please help?

Hi,
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compareScrollPane = new JScrollPane(this.screenCtlContainerPanel,
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I think my own custom CompareLayout is responsible for this???
Please Help
and
Thank you in advance.

hi abillconsl,
Problem in Layout itself...
I am sizing all the component in this Layout ... by taking Panel;s Parent that is JViewPort.
Now as I am resizing component, Java is not being able to identify whether scrollbar is needed or not...
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Code for the CompareLayout class.
//////////////////////////////////////Code for Layout.
class CompareViewLayout implements LayoutManager
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this.leftGap = left;
this.topGap = top;
this.middleGap = middle;
this.rightGap = right;
this.bottomGap = bottom;
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public void layoutContainer(Container parent)
<h1>//parent.getParent(), Gives JPortView and here is some problem
//So tell How to use it to not create that problem????
</h1>
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if ((max.width == 0) || (max.height == 0)) {
return;
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public void removeLayoutComponent(Component comp)
// TODO Auto-generated method stub
* @return
private Dimension getBestFitSize(Dimension crntSize,Dimension maxsize,int nDeviceType)
//Calculate here best fit.
//This will say the best size of the component.
int minWidth = crntSize.width;
int minHeight = crntSize.height;
while(minWidth+4< maxsize.width && minHeight+3< maxsize.height)
minWidth = minWidth + 4;
minHeight = minHeight + 3;
return new Dimension(minWidth,minHeight);
private Dimension calculateSize(Container parent1,Container parent)
int componentCount = parent.getComponentCount();
Dimension parSize = parent1.getSize();
parSize.width -= 10;
parSize.height -= 10;
int scrollCount = parent1.getComponentCount();
Dimension comSize = new Dimension();
if(componentCount == ScreenCaptureConstant.GALLERY_MIN_COMPONENT_SCREEN)
//Logic to get the zoom
//Only For NSpire Device.
comSize.height = ScreenCaptureConstant.SINGLE_NSPIRE_COMPONENT_HEIGHT;
comSize.width = ScreenCaptureConstant.SINGLE_NSPIRE_COMPONENT_WIDTH;
parSize.width -= (leftGap + rightGap);
if((parSize.width > comSize.width) &&
(parSize.height > comSize.height))
//Here We Get the size for the One Image.
return getBestFitSize(comSize,parSize,0);
else if(componentCount > ScreenCaptureConstant.GALLERY_MIN_COMPONENT_SCREEN)
//Only Considering for NSpire Devices.
comSize.height = ScreenCaptureConstant.MULTIPLE_NSPIRE_COMPONENT_HEIGHT + middleGap;
comSize.width = ScreenCaptureConstant.MULTIPLE_NSPIRE_COMPONENT_WIDTH + middleGap;
//Logic to get the zoom for multiple screens.
parSize.width -= (leftGap + rightGap + middleGap);
parSize.width = parSize.width/2 ;
//Calculate Here the Size of Each Component.
if(parSize.width > comSize.width)
return new Dimension(parSize.width,getHeightFromWidth(parSize.width,0));
else
return comSize;
return comSize;
private int getHeightFromWidth(int nWidth,int nDeviceType)
int nHeight = (nWidth*3)/4;
return nHeight;
In this code As I am using JViewPort class object this is creating problem
Reasons to use JViewPort class:
1. Gives Inner Area without considering Scrollbar.
2. JScrollPane(Parent of JViewPort) is giving area with scrollbar and there is no way to identify if scrollbar is visible or not???
Becoz i have to place control in non-scroll area.
3. If I uses parent then this will alway give me Panel Size, I am not being able to get Frame/JScrollPane control Size as that is needed for the control.

Resizing component in JScrollPane

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