| no scrollbars when expanding section with managedform.reflow() [message #452174] |
Mon, 14 March 2005 20:21  |
Eclipse User |
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I'm using the form programming sample code from the
org.eclipse.ui.forms.examples plugin, and have modified the
MasterDetailsBlock page so that TyepOneDetailsPage contains an expandable
section. My two code changes are shown with '*' below.
I cannot figure out why expanding the section s1 doesn't result in
scrollbars appearing - I thought the mform.reflow() in my expansion
listener should do that.
Scrollbars *do* appear when I select a new item in the sample's master
part, so there's definitely a scrollable parent in the widget hierarchy, I
just cannot trigger the addition of scrollbars with mform.reflow(). What
should I be calling in the expansion listener?
public void createContents(Composite parent) {
TableWrapLayout layout = new TableWrapLayout();
layout.topMargin = 5;
layout.leftMargin = 5;
layout.rightMargin = 2;
layout.bottomMargin = 2;
parent.setLayout(layout);
FormToolkit toolkit = mform.getToolkit();
Section s1 = toolkit.createSection(parent,
Section.DESCRIPTION|
* Section.TWISTIE|Section.COMPACT);
s1.marginWidth = 10;
s1.setText("Type One Details");
s1.setDescription("Set the properties of the selected TypeOne object.");
TableWrapData td = new TableWrapData(TableWrapData.FILL,
TableWrapData.TOP); td.grabHorizontal = true;
s1.setLayoutData(td);
toolkit.createCompositeSeparator(s1); Composite client =
toolkit.createComposite(s1); GridLayout glayout = new GridLayout();
glayout.marginWidth = glayout.marginHeight = 0; glayout.numColumns = 2;
client.setLayout(glayout);
* s1.addExpansionListener(new ExpansionAdapter() {
public void expansionStateChanged(ExpansionEvent e) {
mform.reflow(true);
}
});
... [rest of app is same as sample code]
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| Re: no scrollbars when expanding section with managedform.reflow () [message #452292 is a reply to message #452278] |
Wed, 16 March 2005 21:28  |
| Eclipse User |
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Thanks Dimitry,
That does the trick. I spent a lot of hours on this one, and to be
honest, I still don't fully understand the distinctions between reflow(),
layout(), pack(), redraw(), etc., nor how they propagate up/down a
hierarchy of SWT components/forms. It would be good if somebody in the
know could write a little on these - I have colleagues who have also spent
a lot of time fiddling with reflow() and layout().
I think you're right. For some reason, the mform.reflow() doesn't affect
the ScrolledComposite. Seems like a bug to me.
The other curious thing about this is that the expanding section
sends a reflow() up the hierarchy by default, but this also does nothing
to the scrollbars.
For the benefit of others, here're the other things that I tried in my
expansion handler, to no avail:
public void expansionStateChanged(ExpansionEvent e) {
// exifSection.layout(true);
// exifSection.pack(true);
// exifSection.notifyListeners(SWT.Resize, new Event());
// mform.reflow(true);
// mform.getForm().layout();
// mform.getForm().reflow(true); // This is what mform.reflow() does
// mform.getForm().redraw();
// mform.getForm().notifyListeners(SWT.Resize, new Event());
// parent.getParent().getParent().layout(true);
((SharedScrolledComposite)(parent.getParent().getParent())). reflow(true);
}
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