Scrollpane - no scrollbars when minimised

Does anyone know what the cause of this problem is? When I minimise the screen I won't get any scrollbars when the contents within the scrollpane is larger than the scrollpane (and when no scrollbar is required in a miximised position). However if the contents is larger then the scrollpane in the maximised position then scrollbar will appear. My programs have some components witin a panel within a scrollpane within a tabbedpane.
Thanks
Peter Loo

Maybe your JScrollPane should not have a setMinimumSize,
and your scrolled JPanel should have a setMinimumSize.

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Use scrollbars when panel too small for components in it

Hi
I've got a JPanel which just uses flow layout to contain some components. The panel resizes with the JFrame it is in, and wraps the components to new "rows" of components if the width of the JFrame gets too small. Fine.
If the space available is not sufficient, the components go off the bottom of the JPanel.
So I thought "put the JPanel inside a JScrollPane".
Problem is that the JScrollPane does not try to wrap the components to a new row of components if the width of the JFrame is too small. Instead, it displays the horizontal scrollbar, and ignores the fact that there is more space available.
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package com.evotec.CCDViewer.Real3.mypackage;
import java.awt.*;
import javax.swing.*;
public class TestScrollPanes extends JFrame {
private JScrollPane jScrollPane1 = new JScrollPane();
private BorderLayout borderLayout1 = new BorderLayout();
private JPanel jPanel1 = new JPanel();
private JButton jButton1 = new JButton();
private JButton jButton2 = new JButton();
private JButton jButton3 = new JButton();
private JButton jButton4 = new JButton();
private JButton jButton5 = new JButton();
private GridLayout gridLayout1 = new GridLayout();
public TestScrollPanes() {
    try {
      jbInit();
    } catch(Exception e) {
      e.printStackTrace();
    this.setSize(500,500);
    this.setDefaultCloseOperation(EXIT_ON_CLOSE);
    this.setVisible(true);
public static void main(String[] args) {
    new TestScrollPanes();
private void jbInit() throws Exception {
    this.getContentPane().setLayout(borderLayout1);
    this.setSize(new Dimension(354, 270));
    jScrollPane1.getViewport().setLayout(gridLayout1);
    jButton1.setText("jButton1");
    jButton2.setText("jButton2");
    jButton3.setText("jButton3");
    jButton4.setText("jButton4");
    jButton5.setText("jButton5");
    jPanel1.add(jButton1, null);
    jPanel1.add(jButton2, null);
    jPanel1.add(jButton3, null);
    jPanel1.add(jButton4, null);
    jPanel1.add(jButton5, null);
    jScrollPane1.getViewport().add(jPanel1, null);
    this.getContentPane().add(jScrollPane1, BorderLayout.CENTER);
}

Custom24, the problem you are running into is due to a conflict between the
FlowLayout and the ScrollPane; FlowLayout only wraps components when
it hits the width of the panel, but inside a ScrollPane, the panel can be as
wide as it wants. So, you have to limit that somehow. Also, FlowLayout goes
right after the width of the panel, not the preferred width, and not via an
accessor; it uses it directly.
So, this seems to work.
import java.awt.*;
import javax.swing.*;
public class TestScrollableFlowPanel extends JFrame {
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               public void run() {
                    new TestScrollableFlowPanel();
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     public TestScrollableFlowPanel() {
          try {
               jbInit();
          } catch ( Exception e ) {
               e.printStackTrace();
          this.setSize( 300, 300 );
          this.setDefaultCloseOperation( EXIT_ON_CLOSE );
          this.setVisible( true );
     private void jbInit() throws Exception {
          ScrollableFlowPanel panel = new ScrollableFlowPanel();
          for ( int k = 0; k < 120; k++ )
               panel.add( new JButton( "Button" + k ) );
          JScrollPane scroll = new JScrollPane( panel );
          this.getContentPane().setLayout( new BorderLayout() );
          this.getContentPane().add( scroll, BorderLayout.CENTER );
     static public class ScrollableFlowPanel extends JPanel implements Scrollable {
          public void setBounds( int x, int y, int width, int height ) {
               super.setBounds( x, y, getParent().getWidth(), height );
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               return true;
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               int rv = 0;
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                    Component comp = getComponent( k );
                    Rectangle r = comp.getBounds();
                    int height = r.y + r.height;
                    if ( height > rv )
                         rv = height;
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}: jay

ScrollPane problem - scrollbars not updated after child rescaling

Hi.
Here is a simple application using a ScrollPane to display a large circle. Initially everything looks fine but when you use zoom in and zoom out buttons ScrollPane doesn't update the scrollbars. Scrollbars are only updated after you try to scroll. Even worse - if you zoom out a couple of times, scrollbars dissapear. If you then zoom in again scrollbars will only reappear if you resize the stage main window.
Is there something else I should do in addition to rescaling the circle node?
Thanks for your help.
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import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ScrollPane;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.transform.Scale;
import javafx.stage.Stage;
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        Application.launch(args);
}

Hi,
see this thread maybe you find something helpful.
javafx.scene.Group "auto-size" doesn't work in my case

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txt.setMask(mask);
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Pat

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I think Brent's suggestion is very good. Another hack would be to cover the additional array elements with a decoration so that you only see one element.
Message Edited by vt92 on 04-21-2009 09:58 AM
"There is a God shaped vacuum in the heart of every man which cannot be filled by any created thing, but only by God, the Creator, made known through Jesus." - Blaise Pascal
Attachments:
need to scroll.PNG ‏14 KB

Disable scrollbar when content is lower than viewport ?

Hi,
I have a vertical scrollbar always showed (JScrollPane.VERTICAL_SCROLLBAR_ALWAYS),
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Take for example Chrome browser in Windows: when u open up Google, the content of the page is quite low in height and the scrollbar in Chrome will be disabled. As soon as you have enough content on the page the scrollbar will be active.
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Thanks

Hello,
It's not really a problem, I just realize it is a SWING limitation, (...)
Almost all app have this behaviour; it isn't really nice visually.I don't have Chrome, and haven't seen this behavior anywhere so far (but admittedly, I'm way behind in terms of GUI fashion).
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import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class TestDisableScrollBar extends JPanel
    private static final String SHORT_TEXT = "text";
    private static final String LONG_TEXT = "texttexttexttexttexttexttexttexttexttexttextte";
    private static void createAndShowGUI()
        JFrame frame = new JFrame("Demo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JTextArea textarea = new JTextArea(5, 5); // just to take up some space.
        final JLabel label = new JLabel(SHORT_TEXT);
        JPanel view = new JPanel();
        view.setLayout(new GridLayout(2, 1));
        view.add(label);
        view.add(textarea);
        final JScrollPane widget = new JScrollPane(view, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
        widget.getHorizontalScrollBar().setEnabled(false);
        widget.getViewport().addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent e) {
                widget.getHorizontalScrollBar().setEnabled(
                        widget.getViewport().getWidth()<
                        widget.getViewport().getView().getWidth());
        frame.getContentPane().add(widget, BorderLayout.CENTER);
        JButton alternateText = new JButton("Switch width");
        alternateText.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                label.setText(label.getText().equals(SHORT_TEXT)?
                    LONG_TEXT : SHORT_TEXT);
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        frame.pack();
        frame.setVisible(true);
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I have developed a Custom Form. In that there is a Content Canvas and on the top of that I have put a Stacked Canvas so that i can get both the Horizontal and Vertical scrollbars. the form has more than 40 fields to display.
Folder tool functionality has also been added to the Form.
The form works absolutely fine and scrollbars too.
But when I am resizing the window (making the window size bigger or smaller by dragging the window on the Oracle Apps screen), at that time I am loosing the vertical Scrollbar. Other than Vertical scrollbar everything works fine.
Is there any way (any code) by which the Vertical Scrollbar will not disappear.
I would really appreciate if any one could guide me on this.
Thanks
Madhu

Madhu,
Please post your message in the Oracle E-Biz forum. This forum is for Non-EBS Forms development and everyone here may not have EBS Forms development experience.
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Craig...

Dreamweaver CS5.5 Slow down when minimising and loading pages.

Hi there
I'm having a really strange problem with Dreamweaver CS5.5
I'm currently in the process of building a CMS for a client and I am experience slow down in Dreamwever when opening and closing certain pages, it also causes slow down/hanging when opening and minimising Dreamweaver itself if these certain pages are open at the time. Which starts to get very annoying when you're swapping between Photoshop and Dreamweaver all the time...
I narrowed it down to a CSS file causing the slow down/hanging. This being the main stylesheet for the CMS... admin.css
When I comment out the CSS file Dreamweaver minimises and maximises quickly, and the page in question opens fast.
The stylesheet is about 900 lines long at the moment, but I've got php and javascript files (and also other CSS files) which are much longer and none of them cause slow down/hanging.
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I can't explain this at all, but I've solved it.
I changed the style below:
@media only screen and (min-width: 35em) {
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.ir br { display: none; }
.hidden { display: none !important; visibility: hidden; }
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.clearfix:before,.clearfix:after{content: '.'; display: block; overflow: hidden; visibility: hidden; font-size: 0; line-height: 0; width: 0; height: 0;}
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To this:
@media only screen and (min-width: 35em) {
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.clear {clear:both; display:block; overflow:hidden; visibility:hidden; width:0; height:0;}
.clearfix:before,.clearfix:after{content: '.'; display: block; overflow: hidden; visibility: hidden; font-size: 0; line-height: 0; width: 0; height: 0;}
.clearfix:after {clear: both;}
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/*END DONT CHANGE*/
Moved it outside of the media query. It was put there by mistake by the looks of it.

How to avoid multiple scrollbars when placing multiple lists in a vbox ?

Hi All ,
Am using a flex application using flex builder 3 ...
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In other words , each list must display all of its children with no scroll bar. If i set the vertical scroll bar to "off" ,
it just removes the vertical scrollbar so that the user is not able to scroll the list (rest of the children are not visible)
I have attached a sample application to illustrate the problem I face right now....
When the following application is run ,
Present Behavior:
2 scrollbars are visible , the outer vbox scrollbar and the inner list scrollbar(for each scrollbar)
Expected Behavior:
1 scrollbar should only be visible ie. the outer vbox scrollbar.
Each list should display all of its children with no scrollbars.
Application code:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" verticalScrollPolicy="off">
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       <mx:List dataProvider="{dataProviderArray1}" width="100%" />
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            <mx:Object label="B............" data="2"/>
            <mx:Object label="C............" data="3"/>
            <mx:Object label="A............" data="1"/>
            <mx:Object label="B............" data="2"/>
            <mx:Object label="C............" data="3"/>
            <mx:Object label="A............" data="1"/>
            <mx:Object label="B............" data="2"/>
            <mx:Object label="C............" data="3"/>
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            <mx:Object label="F............" data="5"/>
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            <mx:Object label="E............" data="4"/>
            <mx:Object label="F............" data="5"/>
            <mx:Object label="D............" data="3"/>
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            <mx:Object label="E............" data="4"/>
            <mx:Object label="F............" data="5"/>
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Hello,
If you know the length of dataprovider and can specify the height in pixels for each list, then below mentioned code may help:
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        <mx:List id="l1" dataProvider="{dataProviderArray1}" width="100%" height="500"   />
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        <mx:List id="l5" y="{l4.y + l4.height + 5}" height="300" dataProvider="{dataProviderArray1}" width="100%" />
        <mx:List id="l6" y="{l5.y + l5.height + 5}" height="300" dataProvider="{dataProviderArray2}" width="100%" />
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Tanu

Vertical scrollbar when you start program

hello,
where do I set up when the program starts to show a vertical scrollbar?
front panel is higher than the monitor and I do not see the whole FP.
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Peter

Use Maximize property, it will fit your FP according to screen resolution.
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Gaurav k
CLD Certified !!!!!
Do not forget to Mark solution and to give Kudo if problem is solved.

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I'm not sure how to approach this problem. I have a JList which resides in a JScrollPane. This list is updated every few seconds with setListData(). The list only has 5 viewable items so the user must scroll to see any additional. However when the list is updated it causes the Scrollbar (Knob) to reset to the top position. Forcing the user to scroll down every few seconds to see the additional items. I'm looking for a way to reposition the the view to the users last scrolled position. Or get the scrollbar to ignore the refresh and remain at the previous position.
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Theres still some inconsistentency with it. But youfolks set me on the right track.
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Scrollpane - no scrollbars when minimised

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