Steven Huey wrote:
I'm starting to dig into the source code to try and figure out a few
things, but figured I ask here to try and save myself some time.
If I have a JSVGCanvas within a JSVGScroll pane does the document state
have to be set to ALWAYS_STATIC? If I do the following:
No, not in my testing.
JPanel panel = new JPanel(new BorderLayout());
JSVGCanvas canvas = new JSVGCanvas();
JSVGScrollPane scrollPane = new JSVGScrollPane(canvas);
canvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
canvas.setURI(someURI);
panel.add(scrollPane, BorderLayout.CENTER);
Nothing is drawn in the JFrame that the panel is added to, if I comment
out the fourth line it is drawn and scrolls just fine. Is there a way to
get ALWAYS_DYNAMIC documents to scroll within a JSVGScrollPane?
I suspect that the problem is that when you set the document
the size of the JSVGCanvas is zero (it isn't parented). You should
(must) have the Canvas connected (and packed?) before you set the
URI. In your example I suspect that you just need to move all the
swing building before the canvas manipulating.
I'm a little surprised that it works for STATIC but the place
where the desired size of the canvas is set is a bit different
between the two.
Secondly, what is the relationship between the SVG viewport, SVG viewBox
attribute, and the size of the JSVGCanvas?
Sure ask the simple questions ;)
The requested size of the JSVGCanvas is controlled by the
width/height attributes on the outermost SVG element.
The viewBox is used to map the actually available screen space
(the component size) to the provided userspace (or the other way around
if you prefer). When either or both of these aren't specified there
are a bunch of "fallbacks".
How are things different (if at all) when the JSVGCanvas is placed
inside a JSVGScrollPane?
Things are a little bit different in this case. I believe(?) that
the canvas/scrollpane set the desired size to the width/height
attributes. However when the scrollPane (and hence the canvas) is
resized the userspace->devicespace is not recomputed (as it is
by default when the canvas is not in a scrollpane). This is why
your canvas stays 1 pixel large when it is finally reparented into
the swing tree and get's a real size (I still don't know why it
works for static).
In the JSVGScrollPane the viewbox is also used to determine the
extent of scrolling allowed.
What I'd like to be able to do is load a SVG document into a JSVGCanvas
within a JSVGScrollPane with the SVG document set to display at a
preset size, rather than automatically resizing to fit the size of
the JSVGCanvas.
This should be easily accomplished by overriding the JSVGComponent
method 'setMySize' to do nothing (it's a little unclear to me exactly
how the ScrollPane get's it's size, I think it just goes with the
flow with it's child/parent (i.e. default swing behaviour for a
container).
I need to set the document state to ALWAYS_DYNAMIC so that I can
dynamically modify the "display" attribute of several elements at runtime.
I've done a fair amount of testing of this so I'm fairly certain
this works.
Hope that makes things clearer.
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