| ScrollableGraphicalViewer and key accelerations [message #87523] |
Wed, 16 July 2003 07:21  |
Eclipse User |
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Hello all!
I want to enable the arrow and page-up/down keys for my editor. This
appears to not be done by default for ScrollableGraphicalViewer. I do
not seem to be able to do so by adding key event listeners either. Has
someone done this successfully?
Here is what I tried:
protected void configureGraphicalViewer()
{
super.configureGraphicalViewer();
GraphicalViewer viewer = getGraphicalViewer();
viewer.setRootEditPart(new FreeformGraphicalRootEditPart());
viewer.setEditPartFactory(new CvsGraphEditPartFactory());
viewer.getControl().addKeyListener(
new KeyAdapter()
{
public void keyPressed(KeyEvent event)
{
if (event.character == SWT.PAGE_DOWN &&
event.stateMask == 0)
{
_logger.debug("Page Down pressed!");
}
else if (event.character == SWT.PAGE_UP &&
event.stateMask == 0)
{
_logger.debug("Page Up pressed!");
}
}
}
);
}
I get nothing in the log (yes, debug is enabled).
Thanx
jeff
--
Jeffrey Bonevich
Ann Arbor, Michigan
bonevich at covad dot net
jeff at bonevich dot com
http://www.bonevich.com
"Make me a fire and I'm warm for a night. Set me
on fire and I'm warm for the rest of my life."
- Ancient Didactical Saying
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| Re: ScrollableGraphicalViewer and key accelerations [message #87714 is a reply to message #87568] |
Wed, 16 July 2003 21:45  |
| Eclipse User |
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Success! I took a look at what LogicEditor was doing, and also
inspected source for GraphicalViewerKeyHandler, and I have resolved the
problem at least to my satisfaction for now. Inside my editor, I
declare the following inner class to use as a key handler:
class CvsGraphViewerKeyHandler extends GraphicalViewerKeyHandler
{
public CvsGraphViewerKeyHandler(GraphicalViewer viewer)
{
super(viewer);
}
public boolean keyPressed(KeyEvent event)
{
if (event.keyCode == SWT.PAGE_DOWN ||
event.keyCode == SWT.PAGE_UP ||
event.keyCode == SWT.HOME ||
event.keyCode == SWT.END )
{
ScrollingGraphicalViewer viewer = (ScrollingGraphicalViewer)
getGraphicalViewer();
FigureCanvas canvas = (FigureCanvas) viewer.getControl();
int x = canvas.getViewport().getViewLocation().x;
int y = canvas.getViewport().getViewLocation().y;
int dx = 0;
int dy = 0;
Dimension viewingArea =
canvas.getViewport().getClientArea().getSize();
Rectangle totalArea = canvas.getBounds();
switch (event.keyCode)
{
case SWT.PAGE_DOWN : dx = x; dy = y + viewingArea.height; break;
case SWT.PAGE_UP : dx = x; dy = y - viewingArea.height; break;
case SWT.HOME : dx = 0; dy = y; break;
case SWT.END : dx = totalArea.width; dy = y; break;
default: dx = x; dy = y; break;
}
canvas.scrollSmoothTo(dx, dy);
return true;
}
return super.keyPressed(event);
}
}
This does the trick! Helps that I changed "event.character ==
SWT.PAGE_DOWN" to "event.keyCode == SWT.PAGE_DOWN". I think that was
the main source of my problem. Then I just added the appropriate
scrolling behavior for the arrows, page up/down, home/end. Voila!
Thanx again!
jeff
Eric Bordeau wrote:
> The logic example uses a GraphicalViewerKeyHandler (see
> LogicEditor.configureGraphicalViewer()). This key handler uses the
> arrow keys to navigate to the different edit parts in the viewer. The
> key handler also checks for the Home, End, PgUp and PgDn key events, but
> then calls a method that does nothing. I have opened a bug for this.
>
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=40208
>
>
>
> Jeffrey Bonevich wrote:
>
>> Hello all!
>>
>> I want to enable the arrow and page-up/down keys for my editor. This
>> appears to not be done by default for ScrollableGraphicalViewer. I do
>> not seem to be able to do so by adding key event listeners either.
>> Has someone done this successfully?
>>
>> Here is what I tried:
>> protected void configureGraphicalViewer()
>> {
>> super.configureGraphicalViewer();
>> GraphicalViewer viewer = getGraphicalViewer();
>> viewer.setRootEditPart(new FreeformGraphicalRootEditPart());
>> viewer.setEditPartFactory(new CvsGraphEditPartFactory());
>>
>> viewer.getControl().addKeyListener(
>> new KeyAdapter()
>> {
>> public void keyPressed(KeyEvent event)
>> {
>> if (event.character == SWT.PAGE_DOWN &&
>> event.stateMask == 0)
>> {
>> _logger.debug("Page Down pressed!");
>> }
>> else if (event.character == SWT.PAGE_UP &&
>> event.stateMask == 0)
>> {
>> _logger.debug("Page Up pressed!");
>> }
>> }
>> }
>> );
>> }
>>
>> I get nothing in the log (yes, debug is enabled).
>>
>> Thanx
>>
>> jeff
>>
>
--
Jeffrey Bonevich
Ann Arbor, Michigan
bonevich at covad dot net
jeff at bonevich dot com
http://www.bonevich.com
"Make me a fire and I'm warm for a night. Set me
on fire and I'm warm for the rest of my life."
- Ancient Didactical Saying
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