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.venv/Lib/site-packages/pythonwin/pywin/Demos/threadedgui.py

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+# Demo of using just windows, without documents and views.
+
+# Also demo of a GUI thread, pretty much direct from the MFC C++ sample MTMDI.
+
+import win32ui
+import win32con
+import win32api
+import timer
+
+from pywin.mfc import window, docview, thread
+from pywin.mfc.thread import WinThread
+
+
+WM_USER_PREPARE_TO_CLOSE = win32con.WM_USER + 32
+
+# font is a dictionary in which the following elements matter:
+# (the best matching font to supplied parameters is returned)
+#   name		string name of the font as known by Windows
+#   size		point size of font in logical units
+#   weight		weight of font (win32con.FW_NORMAL, win32con.FW_BOLD)
+#   italic		boolean; true if set to anything but None
+#   underline	boolean; true if set to anything but None
+
+# This window is a child window of a frame.  It is not the frame window itself.
+class FontWindow(window.Wnd):
+    def __init__(self, text="Python Rules!"):
+        window.Wnd.__init__(self)
+        self.text = text
+        self.index = 0
+        self.incr = 1
+        self.width = self.height = 0
+        self.ChangeAttributes()
+        # set up message handlers
+
+    def Create(self, title, style, rect, parent):
+        classStyle = win32con.CS_HREDRAW | win32con.CS_VREDRAW
+        className = win32ui.RegisterWndClass(
+            classStyle, 0, win32con.COLOR_WINDOW + 1, 0
+        )
+        self._obj_ = win32ui.CreateWnd()
+        self._obj_.AttachObject(self)
+        self._obj_.CreateWindow(
+            className, title, style, rect, parent, win32ui.AFX_IDW_PANE_FIRST
+        )
+        self.HookMessage(self.OnSize, win32con.WM_SIZE)
+        self.HookMessage(self.OnPrepareToClose, WM_USER_PREPARE_TO_CLOSE)
+        self.HookMessage(self.OnDestroy, win32con.WM_DESTROY)
+        self.timerid = timer.set_timer(100, self.OnTimer)
+        self.InvalidateRect()
+
+    def OnDestroy(self, msg):
+        timer.kill_timer(self.timerid)
+
+    def OnTimer(self, id, timeVal):
+        self.index = self.index + self.incr
+        if self.index > len(self.text):
+            self.incr = -1
+            self.index = len(self.text)
+        elif self.index < 0:
+            self.incr = 1
+            self.index = 0
+        self.InvalidateRect()
+
+    def OnPaint(self):
+        # 		print "Paint message from thread", win32api.GetCurrentThreadId()
+        dc, paintStruct = self.BeginPaint()
+        self.OnPrepareDC(dc, None)
+
+        if self.width == 0 and self.height == 0:
+            left, top, right, bottom = self.GetClientRect()
+            self.width = right - left
+            self.height = bottom - top
+        x, y = self.width // 2, self.height // 2
+        dc.TextOut(x, y, self.text[: self.index])
+        self.EndPaint(paintStruct)
+
+    def ChangeAttributes(self):
+        font_spec = {"name": "Arial", "height": 42}
+        self.font = win32ui.CreateFont(font_spec)
+
+    def OnPrepareToClose(self, params):
+        self.DestroyWindow()
+
+    def OnSize(self, params):
+        lParam = params[3]
+        self.width = win32api.LOWORD(lParam)
+        self.height = win32api.HIWORD(lParam)
+
+    def OnPrepareDC(self, dc, printinfo):
+        # Set up the DC for forthcoming OnDraw call
+        dc.SetTextColor(win32api.RGB(0, 0, 255))
+        dc.SetBkColor(win32api.GetSysColor(win32con.COLOR_WINDOW))
+        dc.SelectObject(self.font)
+        dc.SetTextAlign(win32con.TA_CENTER | win32con.TA_BASELINE)
+
+
+class FontFrame(window.MDIChildWnd):
+    def __init__(self):
+        pass  # Dont call base class doc/view version...
+
+    def Create(self, title, rect=None, parent=None):
+        style = win32con.WS_CHILD | win32con.WS_VISIBLE | win32con.WS_OVERLAPPEDWINDOW
+        self._obj_ = win32ui.CreateMDIChild()
+        self._obj_.AttachObject(self)
+
+        self._obj_.CreateWindow(None, title, style, rect, parent)
+        rect = self.GetClientRect()
+        rect = (0, 0, rect[2] - rect[0], rect[3] - rect[1])
+        self.child = FontWindow("Not threaded")
+        self.child.Create(
+            "FontDemo", win32con.WS_CHILD | win32con.WS_VISIBLE, rect, self
+        )
+
+
+class TestThread(WinThread):
+    def __init__(self, parentWindow):
+        self.parentWindow = parentWindow
+        self.child = None
+        WinThread.__init__(self)
+
+    def InitInstance(self):
+        rect = self.parentWindow.GetClientRect()
+        rect = (0, 0, rect[2] - rect[0], rect[3] - rect[1])
+
+        self.child = FontWindow()
+        self.child.Create(
+            "FontDemo", win32con.WS_CHILD | win32con.WS_VISIBLE, rect, self.parentWindow
+        )
+        self.SetMainFrame(self.child)
+        return WinThread.InitInstance(self)
+
+    def ExitInstance(self):
+        return 0
+
+
+class ThreadedFontFrame(window.MDIChildWnd):
+    def __init__(self):
+        pass  # Dont call base class doc/view version...
+        self.thread = None
+
+    def Create(self, title, rect=None, parent=None):
+        style = win32con.WS_CHILD | win32con.WS_VISIBLE | win32con.WS_OVERLAPPEDWINDOW
+        self._obj_ = win32ui.CreateMDIChild()
+        self._obj_.CreateWindow(None, title, style, rect, parent)
+        self._obj_.HookMessage(self.OnDestroy, win32con.WM_DESTROY)
+        self._obj_.HookMessage(self.OnSize, win32con.WM_SIZE)
+
+        self.thread = TestThread(self)
+        self.thread.CreateThread()
+
+    def OnSize(self, msg):
+        pass
+
+    def OnDestroy(self, msg):
+        win32ui.OutputDebugString("OnDestroy\n")
+        if self.thread and self.thread.child:
+            child = self.thread.child
+            child.SendMessage(WM_USER_PREPARE_TO_CLOSE, 0, 0)
+            win32ui.OutputDebugString("Destroyed\n")
+
+
+def Demo():
+    f = FontFrame()
+    f.Create("Font Demo")
+
+
+def ThreadedDemo():
+    rect = win32ui.GetMainFrame().GetMDIClient().GetClientRect()
+    rect = rect[0], int(rect[3] * 3 / 4), int(rect[2] / 4), rect[3]
+    incr = rect[2]
+    for i in range(4):
+        if i == 0:
+            f = FontFrame()
+            title = "Not threaded"
+        else:
+            f = ThreadedFontFrame()
+            title = "Threaded GUI Demo"
+        f.Create(title, rect)
+        rect = rect[0] + incr, rect[1], rect[2] + incr, rect[3]
+    # Givem a chance to start
+    win32api.Sleep(100)
+    win32ui.PumpWaitingMessages()
+
+
+if __name__ == "__main__":
+    import demoutils
+
+    if demoutils.NeedGoodGUI():
+        ThreadedDemo()
+# 		Demo()