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

# 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 timer
import win32api
import win32con
import win32ui
from pywin.mfc import docview, thread, window
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()