Heavyweight Component resizing inside JScrollpane

[random7]

Hi,

in my application i have a heavyweight component (jpanel with a few buttons, jtextfields, jtextareas, etc) that i put in a scrollpane.
the scrollpane is supposed to only scroll vertically - in the horizontal direction, i want to resize the components in the scrollpane to the appropriate size depending on the main frame of the application.

when the application starts, everything is fine and the components take up the available size.
when i increase the application window size hotizonally, the components (mainly the jTF and jTA) increase in size, as it is's supposed to be.
But once i decrease the horizontal size again, the jTF and jTA stay the size they were before and do not shrink as i want them to.
If i just add the jpanel without putting it inside a jscrollpane, the resizing works perfect. i need a vertical scroller though, so this is not an option.

here is a picture that shows the resizing behaviour:


inside the JPanel that is inside the scrollpane i use a grouplayout.
here is a portion of my code that shows how one of the components inside the panel is layed out.

		// component layout for the LINKS panel
		// horizontal groups
		SequentialGroup hGroup = layout.createSequentialGroup();
		ParallelGroup h2 = layout.createParallelGroup();
		ParallelGroup h3 = layout.createParallelGroup();
		ParallelGroup h4 = layout.createParallelGroup();

		h2.addComponent(linkListScrollPane, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE, Short.MAX_VALUE);
		h3.addComponent(bAddLink);
		h4.addComponent(bRemoveLink);

		hGroup.addGroup(h2);
		hGroup.addPreferredGap(LayoutStyle.ComponentPlacement.UNRELATED);
		hGroup.addGroup(h3);
		hGroup.addPreferredGap(LayoutStyle.ComponentPlacement.UNRELATED);
		hGroup.addGroup(h4);
		layout.setHorizontalGroup(hGroup);

		// vertical groups
		SequentialGroup vGroup = layout.createSequentialGroup();
		ParallelGroup v1 = layout.createParallelGroup();

		v1.addComponent(linkListScrollPane, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE,
				GroupLayout.PREFERRED_SIZE);
		v1.addComponent(bAddLink);
		v1.addComponent(bRemoveLink);

		vGroup.addGroup(v1);
		layout.setVerticalGroup(vGroup);

If other code portions are needed, please tell me.
I hope someone can help me with this one :)

[Prajin]

Hi,
1)JScrollPane supports lightWeight component only.
2)JPanel, JTextField etc r lightWright.
&
3)I don't use JScrollPane, but still check this out.

JScrollPane jsp = new JScrollPane();
jsp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);

-regards

[random7]

Hi,

thanks for you answer Prajin. Unfortunately it wont solve the problem since the components still remain too large.



I've found a solution that works though.

You need to set the preferredSize of the JPanel inside the JScrollPane.
This way, the components inside the JPanel try to shrink according to the preferredSize.

How it looks now:

// code part building the gui 
// scrollpane
    JScrollPane frameEditorScroller = new JScrollPane(new FrameEditor());
    frameEditorScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED);
    frameEditorScroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);


// panel class that resides in the jscrollpane
public class FrameEditor extends JPanel {

    public FrameEditor()
	this.setPreferredSize(new Dimension(500, 400);
        // + other stuff below

   }
}