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Workaround for Qt bug where toggling the ToC, or opening a dialog would unregister for touch events

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This commit is contained in:
Kovid Goyal 2014-02-09 18:49:00 +05:30
parent 80cfa2ee9c
commit 982316dd91
1 changed files with 23 additions and 5 deletions
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28
src/calibre/gui2/viewer/gestures.py
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@ -6,12 +6,21 @@ from __future__ import (unicode_literals, division, absolute_import,
__license__ = 'GPL v3'
__copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
import time, ctypes
from PyQt4.Qt import QObject, QPointF, pyqtSignal, QEvent
import time, ctypes, sys
from PyQt4.Qt import QObject, QPointF, pyqtSignal, QEvent, QApplication
from calibre.constants import iswindows, isxp
from calibre.constants import iswindows
touch_supported = iswindows and not isxp
touch_supported = False
if iswindows and sys.getwindowsversion()[:2] >= (6, 2): # At least windows 7
from ctypes import wintypes
try:
RegisterTouchWindow = ctypes.windll.user32.RegisterTouchWindow
RegisterTouchWindow.argtypes = (wintypes.HWND, wintypes.ULONG)
RegisterTouchWindow.restype = wintypes.BOOL
touch_supported = True
except Exception:
pass
HOLD_THRESHOLD = 1.0 # seconds
SWIPE_DISTANCE = 50 # manhattan pixels
@ -163,7 +172,6 @@ class GestureHandler(QObject):
# events. See http://msdn.microsoft.com/en-us/library/windows/desktop/ms703320(v=vs.85).aspx
self.is_fake_mouse_event = lambda : False
if touch_supported and iswindows:
from ctypes import wintypes
MI_WP_SIGNATURE = 0xFF515700
SIGNATURE_MASK = 0xFFFFFF00
try:
@ -174,10 +182,20 @@ class GestureHandler(QObject):
ans = (val & SIGNATURE_MASK) == MI_WP_SIGNATURE
return ans
self.is_fake_mouse_event = is_fake_mouse_event
QApplication.instance().focusChanged.connect(self.register_for_wm_touch)
except Exception:
import traceback
traceback.print_exc()
def register_for_wm_touch(self, *args):
if touch_supported and iswindows:
# For some reason performing certain actions like toggling the ToC
# view causes windows to stop sending WM_TOUCH events. This works
# around that bug.
# This will need to be changed for Qt 5.
hwnd = int(self.parent().effectiveWinId())
RegisterTouchWindow(hwnd, 0)
def __call__(self, ev):
if not touch_supported:
return False