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gtklib: add idle_add_single_call function

Changeset ea119f5700cb…

Parent 3423a3c5c0fa…

by Adrian Buehlmann

Changes to one file · Browse files at ea119f5700cb Showing diff from parent 3423a3c5c0fa Diff from another changeset...

Change 1 of 1 Show Entire File tortoisehg/​hgtk/​gtklib.py Stacked
 
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@@ -604,3 +604,22 @@
  return True   except ImportError:   return False + +def idle_add_single_call(f, *args): + '''wrap function f for gobject.idle_add, so that f is guaranteed to be + called only once, independent of its return value''' + + class single_call(object): + def __init__(self, f, args): + self.f = f + self.args = args + def __call__(self): + self.f(*args) # ignore return value of f + return False # return False to signal: don't call me again + + # functions passed to gobject.idle_add must return False, or they + # will be called repeatedly. The single_call object wraps f and always + # returns False when called. So the return value of f doesn't matter, + # it can even return True (which would lead to gobject.idle_add + # calling the function again, if used without single_call). + gobject.idle_add(single_call(f, args))