[Qt-qml] MouseArea for an image with transparent parts

[Dominic Genest]

Hi,

I have been trying Qml very much since the package that was released for 
4.6.0, and I am very pleased of its syntax and extensibility. 
Congratulations to all developers involved!

One feature I still miss very much, though, is the ability to use images 
with an alpha channel and to have MouseArea s that take transparent 
pixels into account for ignoring clicks on them. I have implemented an 
event filter for that, but it resulted in quite hacky code in which I am 
not completely confident, especially for the hover events part (”enter” 
and “leave” events).

I know rectangle-only parts were chosen for performance considerations, 
but I believe that having that feature as an optional flag (somehow like 
the “smooth” properties) would be a very useful feature. Besides, maybe 
I am missing some important point, but I think there could be a way of 
organising things such that checking the transparency of one pixel in 
each image for which the bounding rectangle coincides with the mouse 
position would lead to very acceptable performances.

What do you think?

Dom