Adjustable text transparency

Author: Joker Qyou

counter.py

@@ -10,6 +10,8 @@
 import win32gui_struct
 import win32ui
 
+from dialogs import slider
+
 
 class KeyCounter(object):
 
@@ -28,9 +30,12 @@ def __init__(self):
         self.MENU = None
         self.MENU_ITEMS = (
             ('Quit', self.stop),
+            ('Set transparency', self.set_transparency),
             ('Reset', self.reset_count),
         )
         self.__last_text_extent = (0, 0)
+        self.__transparency_setter = None
+        self.transparency = 128
 
     def reset_count(self):
         self.key_count = 0
@@ -47,6 +52,15 @@ def Key_handler(evt):
         self.hook.KeyDown = Key_handler
         self.hook.HookKeyboard()
 
+    def set_transparency(self):
+        def on_value(value):
+            self.update_window_transparency(value)
+
+        dialog = slider.TransparencySliderDialog(
+            self.transparency, on_value=on_value
+        )
+        dialog.DoModal()
+
     def init_font(self, hdc, paintStruct):
         # http://msdn.microsoft.com/en-us/library/windows/desktop/dd145037(v=vs.85).aspx
         lf = win32gui.LOGFONT()
@@ -97,6 +111,23 @@ def execute_menu_item(self, index):
         if callable(func):
             func()
 
+    def update_window_transparency(self, value=None):
+        if value is not None:
+            value = int(value)
+            if value < 0:
+                value = 0
+            elif value > 255:
+                value = 255
+            self.transparency = value
+
+        # http://msdn.microsoft.com/en-us/library/windows/desktop/ms633540(v=vs.85).aspx
+        win32gui.SetLayeredWindowAttributes(
+            self.HWND,
+            0x00ffffff,
+            self.transparency,  # foreground transparency, 255 means opaque
+            win32con.LWA_COLORKEY | win32con.LWA_ALPHA
+        )
+
     def create_window(self):
         def wndProc(hWnd, message, wParam, lParam):
             if message == self.MESSAGE:
@@ -200,14 +231,8 @@ def wndProc(hWnd, message, wParam, lParam):
             hInstance,
             None  # lpParam
         )
-
-        # http://msdn.microsoft.com/en-us/library/windows/desktop/ms633540(v=vs.85).aspx
-        win32gui.SetLayeredWindowAttributes(
-            hWindow,
-            0x00ffffff,
-            128,  # foreground transparency, 255 means opaque
-            win32con.LWA_COLORKEY | win32con.LWA_ALPHA
-        )
+        self.HWND = hWindow
+        self.update_window_transparency()
         # Transparent background
         win32gui.SetBkMode(hWindow, win32con.TRANSPARENT)
 
@@ -224,8 +249,6 @@ def wndProc(hWnd, message, wParam, lParam):
         # http://msdn.microsoft.com/en-us/library/windows/desktop/ms633548(v=vs.85).aspx
         # win32gui.ShowWindow(hWindow, win32con.SW_SHOW)
 
-        self.HWND = hWindow
-
     def update_tray_icon(self):
         try:
             hIcon = win32gui.LoadIcon(

dialogs/__init__.py

@@ -0,0 +1,80 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+from pywin.mfc import dialog
+import win32con
+import win32ui
+
+
+class TransparencySliderDialog(dialog.Dialog):
+    '''Simple dialog with a single trackbar control inside'''
+    _dialogstyle = (
+        win32con.WS_DLGFRAME |
+        win32con.DS_MODALFRAME | win32con.WS_POPUP | win32con.WS_VISIBLE |
+        win32con.WS_CAPTION | win32con.WS_SYSMENU | win32con.DS_SETFONT
+    )
+    _buttonstyle = (
+        win32con.BS_PUSHBUTTON | win32con.WS_TABSTOP |
+        win32con.WS_CHILD | win32con.WS_VISIBLE
+    )
+    _labelStyle = win32con.WS_CHILD | win32con.WS_VISIBLE
+    DIALOGTEMPLATE = [
+        [
+            'Transparency',
+            (0, 0, 155, 40),  # x, y, w, h
+            _dialogstyle, None,
+            (11, 'Microsoft YaHei')
+        ],
+        [
+            130, 'Transparent', -1, (5, 0, 60, 10),
+            _labelStyle | win32con.SS_LEFT
+        ],
+        [
+            130, 'Opaque', -1, (125, 0, 60, 10),
+            _labelStyle | win32con.SS_LEFT
+        ],
+        [
+            128, 'Ok', win32con.IDOK, (55, 20, 45, 14),
+            _buttonstyle
+        ],
+    ]
+    IDC_SLIDER = 9500
+
+    def __init__(self, init_value=0, on_value=None):
+        dialog.Dialog.__init__(self, self.DIALOGTEMPLATE)
+        self.init_value = init_value
+        self.on_value = on_value
+
+    def OnInitDialog(self):
+        rc = dialog.Dialog.OnInitDialog(self)
+        win32ui.EnableControlContainer()
+        self.slider = win32ui.CreateSliderCtrl()
+        self.slider.CreateWindow(
+            win32con.WS_TABSTOP | win32con.WS_VISIBLE,
+            (105, 0, 280, 30),
+            self._obj_,
+            self.IDC_SLIDER
+        )
+        self.slider.SetRange(0, 255)
+        self.slider.SetPos(self.init_value)
+        self.slider.SetTic(self.init_value)
+        self.HookMessage(self.OnSliderMove, win32con.WM_HSCROLL)
+        return rc
+
+    def OnSliderMove(self, params):
+        if callable(self.on_value):
+            self.on_value(self.slider.GetPos())
+
+    def OnOK(self):
+        if callable(self.on_value):
+            self.on_value(self.slider.GetPos())
+        self._obj_.OnOK()
+
+    def OnClose(self):
+        if callable(self.on_value):
+            self.on_value(self.slider.GetPos())
+        self._obj_.OnClose()
+
+
+if __name__ == '__main__':
+    tDialog = TransparencySliderDialog(128)
+    tDialog.DoModal()