Dear All,
I have a class A which inherit from Window class, I override it's draw
function. And did nothing in this function.
Void A::draw()
{
return;
}
But I found that when I call show() or redraw() function, it can call draw
function and refresh the window to black. Why? I think it should not refresh,
because the draw has do nothing.
Can anyone tell me what's the reason, and how to do nothing when call the
draw() function.
Thanks.
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