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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