def _event_mousebutton(self, ev, button, lParam):
if ev == 'on_mouse_press':
_user32.SetCapture(self._view_hwnd)
else:
_user32.ReleaseCapture()
x, y = self._get_location(lParam)
y = self._height - y
self.dispatch_event(ev, x, y, button, self._get_modifiers())
return 0
def set_exclusive_mouse(self, exclusive=True):
if self._exclusive_mouse == exclusive and \
self._exclusive_mouse_focus == self._has_focus:
return
# Mouse: UsagePage = 1, Usage = 2
raw_mouse = RAWINPUTDEVICE(0x01, 0x02, 0, None)
if exclusive:
raw_mouse.dwFlags = RIDEV_NOLEGACY
raw_mouse.hwndTarget = self._view_hwnd
else:
raw_mouse.dwFlags = RIDEV_REMOVE
raw_mouse.hwndTarget = None
if not _user32.RegisterRawInputDevices(
byref(raw_mouse), 1, sizeof(RAWINPUTDEVICE)):
if exclusive:
raise WindowException("Cannot enter mouse exclusive mode.")
self._exclusive_mouse_buttons = 0
if exclusive and self._has_focus:
# Clip to client area, to prevent large mouse movements taking
# it outside the client area.
rect = RECT()
_user32.GetClientRect(self._view_hwnd, byref(rect))
_user32.MapWindowPoints(self._view_hwnd, HWND_DESKTOP,
byref(rect), 2)
_user32.ClipCursor(byref(rect))
# Release mouse capture in case is was acquired during mouse click
_user32.ReleaseCapture()
else:
# Release clip
_user32.ClipCursor(None)
self._exclusive_mouse = exclusive
self._exclusive_mouse_focus = self._has_focus
self.set_mouse_platform_visible(not exclusive)
