Hi Thomas,
We have this applet inside a jsp and we are setting the size by using
setAttributeNS("","height",..);
When I increase the size of the frame the new area which appears is
not active but when I refersh the page ,then it gets active so I
thought probably the canvas resizing is not happening at runtime so I
thought of updatemanager thread.
Please suggest.
On Fri, Sep 18, 2009 at 4:04 PM, <[email protected]> wrote:
> Hi Shekhar,
>
> Shekhar Bhati <[email protected]> wrote on 09/18/2009 04:50:52 AM:
>
>> I am facing an issue with activating the canvas on frame resizing.
>> I am using batik to show complex images for my application. Here I
>> have some objects for which I have a functionality of
>> highlight/unhighlight the objects. It works like when I click on
>> the object, it gets highlighted and when I click anywhere on the
>> background it gets unhighlighted.
>
> How do you receive the click events on the 'background'? Normally
> this is done by having a 'white' or transparent rectangle that covers
> the entire canvas as the first thing in the SVG file (so it's "below"
> everything else).
>
>> We have inherited the class JSVGScrollPane for scrollbars as we have
>> huge images.
>> The issue is that ,the area which I can see on the first go is active
>> , but when I scroll(pan/zoom out) then the new area which appears is
>> not active, to make it active I have to refresh the page, so the
>> unhighlight does not work on that area which appears after scrolling
>> the page.
>
> It sounds like your background rect for handling unselect doesn't
> cover the entire contents of the canvas. This is fairly easy to test
> by simply 'tinting' your background rectangle so you can see it.
> My guess is that you are using x="0" y="0" width="100%" height="100%"
> as the size of the rectangle - this will cover the 'initial' viewport
> but as you scroll or pan in/out it won't cover the full screen anymore.
>
> The correct thing would be to calculate the actual dimensions of
> the document and use that to populate the rectangle dimensions. The
> simple thing to do is use something like:
> 'x="-5000%" y="-5000%" width="10000%" height="10000%"'
>
>> I have heard about the update manager thread and also used it at many
>> places , but here I am not getting which code to put inside
>> UpdateManager thread to make this hidden area active on scrolling at
>> runtime.
>
> I don't think this is your problem. You could potentially use
> the UpdateManager to update your background rectangles position/size
> on scroll/zoom...
>
>
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