about adding pop menu in treeview

[Zhiyuan Liu <lzymaillist ccoss com cn>]

I'am thinking about adding pop menu in treeview.
the nautilus architechture(2.4 version) is not perfect enough for us to 
add the enhancement of adding pop menu in treeview.
But we really need this feature in our desktop linux distribution, so 
I'am planning implement this feature in following way, though it is not 
a satisfactory way.

1. make a class (say, call it FMSimPopmenuView) which inherits from 
FMDirectoryView, because FMDirectoryView supports
  almost all the file   operations related to pop-memu, and also 
FMDirectoryView has it's own pop menu.
  the FMSimPopmenuView is invisible, so it works in background
2. pop up menu in treeview by doing some event simulation. that is , 
when we right-click some node in the treeview,
  the  change location  operation is not performed for treeview , the 
same is for other views such as  
  FMDirectoryView/location bar etc.
  Instead , FMSimPopmenuView is made to change location to "the parent 
node of the selected node", and then is set selection
  to "the item coresponding to the selected node in the treeview". 
finally the popmenu for FMSimPopmenuView is activated