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Posted to batik-users@xmlgraphics.apache.org by Peter Wagener <pe...@hypoluxo.com> on 2006/04/03 21:44:12 UTC
Re: Scrollbars & auto-resizing
Hi All,
I actually ended up getting the behavior I desired (see previous
email in thread) by setting the canvas's 'recenterOnResize' property
to 'true', but *after* I created the JSVGScrollPane to contain the
canvas. So...
JSVGScrollPane scrollPane = new JSVGScrollPane(canvas);
add(scrollPane, BorderLayout.CENTER);
canvas.setRecenterOnResize(true);
The JSVGScrollPane constructor sets that property to false
explicitly, so I feel like I'm breaking a rule here... anyone know
the reason for doing that? Either way, I've got something workable I
think.
Thanks,
Peter
On Mar 28, 2006, at 4:50 PM, Peter Wagener wrote:
> Hi All,
>
> I'm trying to implement a viewer that has a JSlider to control the
> zoom
> level, and uses scrollbars to allow the user to move around the image
> when zoomed in. In the containing JPanel, I've taken my JSVGCanvas and
> wrapped it inside a JSVGScrollPane...
>
> JSVGScrollPane scrollPane = new JSVGScrollPane(canvas);
> add(scrollPane, BorderLayout.CENTER);
>
> ... and implemented the JSlider control by having the listener
> create a
> new JsvgCanvas.ZoomAction(...). In this case, my JSlider's values go
> from 100 to 300:
>
> double desiredScale = zoomSlider.getValue();
> double oldScale = currentScale;
> double zoomLevel = desiredScale / oldScale;
>
> JSVGCanvas.ZoomAction zoomAction = canvas.new
> ZoomAction(zoomLevel);
> zoomAction.actionPerformed(null);
>
> currentScale = desiredScale;
>
> This works great -- the user can zoom in & out with the slider, and
> the
> scrollbars respond correctly. The zooming is also smooth and shows
> live
> updates. The only minor issue I have is that zooming in, scrolling to
> the bottom, then zooming back out leaves the image uncentered; I'd
> like
> to have it automatically track back towards the original center
> point of
> the image, but I'm willing to leave that for future work :)
>
> My main issue is that the JSVGScrollPane seems to remove the default
> behavior of the JSVGCanvas, in which it automatically resizes
> itself to
> fill the containing JPanel when that panel changes size. This makes
> sense, as the scrollpane's size never changes, but is there a way to
> have the best of both worlds? In other words, have a widget (like the
> slider) control "manual" zooming that has scrollbars, but still let
> the
> JSVGCanvas resize itself as necessary?
>
>
> Thanks,
>
> Peter
>
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Re: Scrollbars & auto-resizing
Posted by th...@kodak.com.
Hi Peter,
It sets it to false because this is the 90% use case for a scroll paned
canvas. When you
grow the scroll area you just want it to expand the visible portion not
'grow' with the canvas.
You aren't breaking any rules you just want something different.
Peter Wagener <pe...@hypoluxo.com> wrote on 04/03/2006 03:44:12
PM:
> I actually ended up getting the behavior I desired (see previous
> email in thread) by setting the canvas's 'recenterOnResize' property
> to 'true', but *after* I created the JSVGScrollPane to contain the
> canvas. So...
>
> JSVGScrollPane scrollPane = new JSVGScrollPane(canvas);
> add(scrollPane, BorderLayout.CENTER);
> canvas.setRecenterOnResize(true);
>
> The JSVGScrollPane constructor sets that property to false
> explicitly, so I feel like I'm breaking a rule here... anyone know
> the reason for doing that? Either way, I've got something workable I
> think.
>
>
> Thanks,
>
> Peter
>
>
>
> On Mar 28, 2006, at 4:50 PM, Peter Wagener wrote:
>
> > Hi All,
> >
> > I'm trying to implement a viewer that has a JSlider to control the
> > zoom
> > level, and uses scrollbars to allow the user to move around the image
> > when zoomed in. In the containing JPanel, I've taken my JSVGCanvas and
> > wrapped it inside a JSVGScrollPane...
> >
> > JSVGScrollPane scrollPane = new JSVGScrollPane(canvas);
> > add(scrollPane, BorderLayout.CENTER);
> >
> > ... and implemented the JSlider control by having the listener
> > create a
> > new JsvgCanvas.ZoomAction(...). In this case, my JSlider's values go
> > from 100 to 300:
> >
> > double desiredScale = zoomSlider.getValue();
> > double oldScale = currentScale;
> > double zoomLevel = desiredScale / oldScale;
> >
> > JSVGCanvas.ZoomAction zoomAction = canvas.new
> > ZoomAction(zoomLevel);
> > zoomAction.actionPerformed(null);
> >
> > currentScale = desiredScale;
> >
> > This works great -- the user can zoom in & out with the slider, and
> > the
> > scrollbars respond correctly. The zooming is also smooth and shows
> > live
> > updates. The only minor issue I have is that zooming in, scrolling to
> > the bottom, then zooming back out leaves the image uncentered; I'd
> > like
> > to have it automatically track back towards the original center
> > point of
> > the image, but I'm willing to leave that for future work :)
> >
> > My main issue is that the JSVGScrollPane seems to remove the default
> > behavior of the JSVGCanvas, in which it automatically resizes
> > itself to
> > fill the containing JPanel when that panel changes size. This makes
> > sense, as the scrollpane's size never changes, but is there a way to
> > have the best of both worlds? In other words, have a widget (like the
> > slider) control "manual" zooming that has scrollbars, but still let
> > the
> > JSVGCanvas resize itself as necessary?
> >
> >
> > Thanks,
> >
> > Peter
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: batik-users-unsubscribe@xmlgraphics.apache.org
> > For additional commands, e-mail: batik-users-
> > help@xmlgraphics.apache.org
> >
> >
>
>
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