|
| Re: How do I get rid of unwanted scroll bars in tree viewer? [message #655973 is a reply to message #655370] |
Wed, 23 February 2011 15:28  |
 Grant Gayed
Messages: 2150
Registered: July 2009 |
Senior Member |
|
|
Hi,
It sounds like you're seeing
https://bugs.eclipse.org/bugs/show_bug.cgi?id=182612 .
The only workaround I can suggest trying is to create a single column in
your Tree, as the scrollbar will update itself in response to column width
shrinks. The SWT-only snippet below demonstrates this, it grows a column to
a width that requires a scrollbar, then shrinks it to make the scrollbar go
away. You won't be able to use this code as-is since you're working at the
JFace level, but it should be helpful for writing what you need.
public static void main(String[] args) {
final Display display = new Display();
Shell shell = new Shell(display);
shell.setBounds(10,10,300,300);
shell.setLayout(new FillLayout());
final Tree tree = new Tree(shell, SWT.NO_SCROLL | SWT.H_SCROLL);
tree.setHeaderVisible(true);
new TreeColumn(tree, SWT.NONE);
new TreeItem(tree, SWT.NONE).setText("hi");
tree.addListener(SWT.MeasureItem, new Listener() {
public void handleEvent(Event event) {
event.width = counter;
System.out.println(counter);
}
});
display.timerExec(1000, new Runnable() {
public void run() {
if (tree.isDisposed()) return;
counter += step;
if (counter == 10) {
step = 20;
}
if (counter == 350) {
step = -20;
}
tree.getColumn(0).pack();
display.timerExec(1000, this);
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}
As a side note, I notice that this is not working on OS X in the eclipse/swt
3.7 stream, so I've logged
https://bugs.eclipse.org/bugs/show_bug.cgi?id=337984 .
Grant
"SBS" <jturnbul@uow.edu.au> wrote in message
news:ijptg6$5ou$1@news.eclipse.org...
>I have a tree viewer that uses an OwnerDrawLabelProvider to draw customised
>labels for tree items. One of the methods in this interface is the
>measure() method where you define the bounds of the label. Whenever I
>expand a node in the tree I calculate the maximum width of all visible tree
>items and use this to set the width in the measure() method and this works
>fine with the scroll bars appearing as required if there are items wider
>than the client area. However, when I collapse that node I want the scroll
>bars to disappear when there are no longer any tree items wider than the
>client area but this is not working.
>
> I know that the measure() method is being called and that I am setting the
> label widths down to something which should not require the presence of
> scroll bars but it appears the viewer or the tree is "remembering" that it
> had wide tree items and decides to keep the scroll bars around.
>
> How can I get these scroll bars to go away when they really are not
> required anymore? I have tried calling tree.layout() and
> tree.getParent().pack() etc. but none of these methods work. The viewer
> just thinks it needs to show these scroll bars anyway.
|
|
|
Powered by
FUDForum. Page generated in 0.03218 seconds
] 
Search
Help
Register
Login
Home
