[PATCH 2/3] shell: add panel height limiation when moving a window

[Bill Spitzak]

Juan Zhao wrote:
> On Tue, 2012-07-24 at 23:17 -0700, Bill Spitzak wrote:
>> On 07/24/2012 10:32 PM, Juan Zhao wrote:
>>
>>>> Therefore I suggest that the sample client work as proposed, and
>> only
>>>> prevent that point from being obscured.
>>> Do you mean, avoiding the places where it could triger the drag to
>> be
>>> obscured?
>> I mean only the point that is clicked. It avoids *one* place that can 
>> trigger a window drag, not all of them.
>>
> It should be defined in the client side.
> Getting lost....

What I am saying is that the shell can assume that if the client 
triggers a window drag for a click at 100,100, that is will *always* 
trigger a window drag for a click at 100,100.

This means that the only point that must not be obscured is 100,100. It 
does not matter if the client also triggers a drag from the point 
200,200. The user by dragging 100,100 can move 200,200 off the screen. 
But the user will still be able to get it back because they can still 
grab 100,100 and move the window so 200,200 is back on the screen.

The shell can make similar assumptions about resizes. If the clicked 
point is distance xy from a moving corner, it can assume that the point 
at that distance will always trigger a resize of that corner. This means 
that when resizing it only has to make sure the point still exists in 
the window and is not obscured.