Dmitrij Sakara wrote:
Thank you (Thomas DeWeese, Tonny Kohar) for answers on my previous questions. Now I have a next portion. :)
I need to handle the drag event and mouse clicks beyond of elements. As far I understand there is two possible solutions:
1) To handle AWT drag event and perform transformation between screen and user coordinates. In this case, how can I do this transformation with considering viewBox too?
You need to use something like getScreenCTM.
2) Create invisible rectangle over all screen and handle DOM MouseMove event over it. In this case, I should protect this rectangle against pan in order to insure his positioning strictly over the whole screen. I achieve this by using JavaScript for standalone SVG documents and Adobe SVG Viewer. Should I use the same approach in case of Batik? What is the performance of this solution?
This will work fine, and is what I normally use. I usually don't bother to protect against pan an instead just ensure that the rect is larger than any reasonable pan amount (it doesn't cost you anything extra to have an extremely large rectangle).
You should use visibility="hidden" to make the rectangle invisible (this is slightly better than fill="none" and a million times better than opacity="0" - actually I think we trap that case now but still visibility is the way to go!). You will then need to set pointer-events="fill" to continue to receive events.
So, which solution is better from standpoint of performance?
I suppose #1 would be ever so slightly faster (if done 100% correct) however in this context I doubt if the difference would ever show up. Since #2 is way less code, and it only depends on standard interfaces it is without a doubt the way I would go.
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