dabo Commit
Revision 6213
Date: 2010-11-24 14:30:59 -0800 (Wed, 24 Nov 2010)
Author: Ed
Trac: http://trac.dabodev.com/changeset/6213
Changed:
U trunk/dabo/ui/uiwx/dPemMixin.py
Log:
Improved the lock/unlockDisplay() calls so that multiple calls simply
increment/decrement a counter instead of making repeated calls.
Diff:
Modified: trunk/dabo/ui/uiwx/dPemMixin.py
===================================================================
--- trunk/dabo/ui/uiwx/dPemMixin.py 2010-11-24 22:04:01 UTC (rev 6212)
+++ trunk/dabo/ui/uiwx/dPemMixin.py 2010-11-24 22:30:59 UTC (rev 6213)
@@ -308,6 +308,9 @@
self._droppedTextHandler = None
self._dropTarget = None
+ # Records the number of display lock calls on this object
+ self._displayLockCount = 0
+
# _beforeInit hook for Class Designer code
self._beforeInitDesignerHook()
@@ -869,11 +872,18 @@
updated at once.
IMPORTANT: you must call unlockDisplay() when you are done, or
your
- object will never draw.
+ object will never draw. unlockDisplay() must be called once for
every
+ time lockDisplay() is called in order to resume repainting of
the
+ control. Alternatively, you can call lockDisplay() many times,
and
+ then call unlockDisplayAll() once when you are done.
Note that lockDisplay currently doesn't do anything on GTK.
"""
- self.Freeze()
+ if self._displayLockCount:
+ self._displayLockCount += 1
+ else:
+ self._displayLockCount = 1
+ self.Freeze()
def unlockDisplay(self):
@@ -881,15 +891,30 @@
Use in conjunction with lockDisplay(), when you are doing lots
of things
that would result in lengthy screen updates.
+
+ Since lockDisplay() may be called several times on an object,
calling
+ unlockDisplay() will "undo" one locking call. When all locks
have been
+ removed, repainting of the display will resume.
"""
- try:
- self.Thaw()
- except dabo.ui.assertionException:
- # Too many 'unlockDisplay' calls to the same object
were made. Log
- # the mistake, but don't throw a Python error.
- dabo.log.error(_("Extra call to unlockDisplay() for
object %s") % self)
+ self._displayLockCount -= 1
+ if not self._displayLockCount:
+ try:
+ self.Thaw()
+ except dabo.ui.assertionException:
+ # Too many 'unlockDisplay' calls to the same
object were made. Log
+ # the mistake, but don't throw a Python error.
+ dabo.log.error(_("Extra call to unlockDisplay()
for object %s") % self)
+ def unlockDisplayAll(self):
+ """Immediately unlocks the display, no matter how many previous
+ lockDisplay calls have been made. Useful in a
callAfterInterval()
+ construction to avoid flicker.
+ """
+ self._displayLockCount = 1
+ self.unlockDisplay()
+
+
def getDisplayLocker(self):
"""Returns an object that locks the current display when
created, and
unlocks it when destroyed. This is generally safer than calling
lockDisplay()
@@ -902,6 +927,8 @@
obj.Freeze()
def __del__(self):
+ if not self._obj:
+ return
try:
self._obj.Thaw()
except StandardError, e:
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