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Source code for kivy.input.providers.wm_pen

Support for WM_PEN messages (Windows platform)

__all__ = ('WM_PenProvider', 'WM_Pen')

import os
from kivy.input.providers.wm_common import *
from kivy.input.motionevent import MotionEvent

[docs]class WM_Pen(MotionEvent): '''MotionEvent representing the WM_Pen event. Supports the pos profile.''' def depack(self, args): self.is_touch = True self.sx, self.sy = args[0], args[1] super(WM_Pen, self).depack(args) def __str__(self): i, u, s, d = (self.id, self.uid, str(self.spos), self.device) return '<WMPen id:%d uid:%d pos:%s device:%s>' % (i, u, s, d)
if 'KIVY_DOC' in os.environ: # documentation hack WM_PenProvider = None else: from collections import deque from ctypes import windll, byref, c_int16, c_int from kivy.input.provider import MotionEventProvider from kivy.input.factory import MotionEventFactory win_rect = RECT() class WM_PenProvider(MotionEventProvider): def _is_pen_message(self, msg): info = windll.user32.GetMessageExtraInfo() # It's a touch or a pen if (info & PEN_OR_TOUCH_MASK) == PEN_OR_TOUCH_SIGNATURE: if not info & PEN_EVENT_TOUCH_MASK: return True def _pen_handler(self, msg, wParam, lParam): if msg not in (WM_LBUTTONDOWN, WM_MOUSEMOVE, WM_LBUTTONUP): return windll.user32.GetClientRect(self.hwnd, byref(win_rect)) x = c_int16(lParam & 0xffff).value / float(win_rect.w) y = c_int16(lParam >> 16).value / float(win_rect.h) y = abs(1.0 - y) if msg == WM_LBUTTONDOWN: self.pen_events.appendleft(('begin', x, y)) self.pen_status = True if msg == WM_MOUSEMOVE and self.pen_status: self.pen_events.appendleft(('update', x, y)) if msg == WM_LBUTTONUP: self.pen_events.appendleft(('end', x, y)) self.pen_status = False def _pen_wndProc(self, hwnd, msg, wParam, lParam): if msg == WM_TABLET_QUERYSYSTEMGESTURE: return QUERYSYSTEMGESTURE_WNDPROC if self._is_pen_message(msg): self._pen_handler(msg, wParam, lParam) return 1 else: return windll.user32.CallWindowProcW(self.old_windProc, hwnd, msg, wParam, lParam) def start(self): self.uid = 0 self.pen = None self.pen_status = None self.pen_events = deque() self.hwnd = windll.user32.GetActiveWindow() # inject our own wndProc to handle messages # before window manager does self.new_windProc = WNDPROC(self._pen_wndProc) self.old_windProc = SetWindowLong_wrapper( self.hwnd, GWL_WNDPROC, self.new_windProc) def update(self, dispatch_fn): while True: try: etype, x, y = self.pen_events.pop() except: break if etype == 'begin': self.uid += 1 self.pen = WM_Pen(self.device, self.uid, [x, y]) elif etype == 'update': self.pen.move([x, y]) elif etype == 'end': self.pen.update_time_end() dispatch_fn(etype, self.pen) def stop(self): self.pen = None SetWindowLong_wrapper(self.hwnd, GWL_WNDPROC, self.old_windProc) MotionEventFactory.register('wm_pen', WM_PenProvider)