# HG changeset patch
# User Adrian Buehlmann <adr...@cadifra.com>
# Date 1255194364 -7200
# Node ID ea119f5700cb01bcb8a5029cc3be4c0cfa671dda
# Parent 3423a3c5c0fa09b976e299cfa3a9b20c94630a94
gtklib: add idle_add_single_call function
diff --git a/tortoisehg/hgtk/gtklib.py b/tortoisehg/hgtk/gtklib.py
--- a/tortoisehg/hgtk/gtklib.py
+++ b/tortoisehg/hgtk/gtklib.py
@@ -604,3 +604,22 @@ def hasspellcheck():
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))
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