import win32api
import win32clipboard
import win32con
import win32gui


class ViewerWindow:
    def __init__(self):
        self.hwndNextViewer = None

    def OnPaint(self, hwnd, msg, wp, lp):
        dc, ps = win32gui.BeginPaint(hwnd)
        wndrect = win32gui.GetClientRect(hwnd)
        wndwidth = wndrect[2] - wndrect[0]
        wndheight = wndrect[3] - wndrect[1]
        win32clipboard.OpenClipboard()
        try:
            try:
                hbitmap = win32clipboard.GetClipboardData(win32clipboard.CF_BITMAP)
            except TypeError:
                font = win32gui.LOGFONT()
                font.lfHeight = 15  # int(wndheight/20)
                font.lfWidth = 15  # font.lfHeight
                #            font.lfWeight=150
                hf = win32gui.CreateFontIndirect(font)
                win32gui.SelectObject(dc, hf)
                win32gui.SetBkMode(dc, win32con.TRANSPARENT)
                win32gui.SetTextColor(dc, win32api.RGB(0, 0, 0))
                win32gui.DrawText(
                    dc,
                    "No bitmaps are in the clipboard\n(try pressing the PrtScn button)",
                    -1,
                    (0, 0, wndwidth, wndheight),
                    win32con.DT_CENTER,
                )
            else:
                bminfo = win32gui.GetObject(hbitmap)
                dcDC = win32gui.CreateCompatibleDC(None)
                win32gui.SelectObject(dcDC, hbitmap)
                win32gui.StretchBlt(
                    dc,
                    0,
                    0,
                    wndwidth,
                    wndheight,
                    dcDC,
                    0,
                    0,
                    bminfo.bmWidth,
                    bminfo.bmHeight,
                    win32con.SRCCOPY,
                )
                win32gui.DeleteDC(dcDC)
                win32gui.EndPaint(hwnd, ps)
        finally:
            win32clipboard.CloseClipboard()
        return 0

    def OnDrawClipboard(self, hwnd, msg, wp, lp):
        win32gui.InvalidateRect(hwnd, None, True)

    def OnChangeCBChain(self, hwnd, msg, wp, lp):
        # If the next window is closing, repair the chain.
        if wp == self.hwndNextViewer:
            self.hwndNextViewer = lp
        # Otherwise, pass the message to the next link.
        elif self.hwndNextViewer:
            win32gui.SendMessage(self.hwndNextViewer, msg, wp, lp)

    def OnCreate(self, hwnd, msg, wp, lp):
        self.hwndNextViewer = win32gui.SetClipboardViewer(hwnd)

    def OnClose(self, hwnd, msg, wp, lp):
        win32clipboard.ChangeClipboardChain(hwnd, self.hwndNextViewer)
        win32gui.DestroyWindow(hwnd)
        win32gui.PostQuitMessage(0)

    def go(self):
        wndproc = {
            win32con.WM_PAINT: self.OnPaint,
            win32con.WM_CLOSE: self.OnClose,
            win32con.WM_CREATE: self.OnCreate,
            win32con.WM_DRAWCLIPBOARD: self.OnDrawClipboard,
            win32con.WM_CHANGECBCHAIN: self.OnChangeCBChain,
        }

        wc = win32gui.WNDCLASS()
        wc.lpszClassName = "test_win32clipboard_bmp"
        wc.style = win32con.CS_GLOBALCLASS | win32con.CS_VREDRAW | win32con.CS_HREDRAW
        wc.hbrBackground = win32con.COLOR_WINDOW + 1
        wc.lpfnWndProc = wndproc
        class_atom = win32gui.RegisterClass(wc)
        hwnd = win32gui.CreateWindowEx(
            0,
            class_atom,
            "ClipboardViewer",
            win32con.WS_CAPTION
            | win32con.WS_VISIBLE
            | win32con.WS_THICKFRAME
            | win32con.WS_SYSMENU,
            100,
            100,
            900,
            900,
            0,
            0,
            0,
            None,
        )
        win32clipboard.SetClipboardViewer(hwnd)
        win32gui.PumpMessages()
        win32gui.UnregisterClass(class_atom, None)


if __name__ == "__main__":
    w = ViewerWindow()
    w.go()