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"""
utility functions to work with gui objects
"""
from PyQt4 import QtCore
def layout_widgets(layout):
"""
return a generator with all widgets in a layout
"""
return (layout.itemAt(i) for i in range(layout.count()))
DELAY_MSECS = 50
def delay(obj, method_str=None, call_args=None):
"""
Triggers a function or slot with a small delay.
this is a mainly a hack to get responsiveness in the ui
in cases in which the event loop freezes and the task
is not heavy enough to setup a processing queue.
"""
if callable(obj) and not method_str:
fun = lambda: obj()
if method_str:
invoke = QtCore.QMetaObject.invokeMethod
if call_args:
fun = lambda: invoke(obj, method_str, call_args)
else:
fun = lambda: invoke(obj, method_str)
QtCore.QTimer().singleShot(DELAY_MSECS, fun)
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