Feature request: Transparent window or even transparent + shaped

A long ago I saw LiLi USB creator and its Window kind of surprised me. Not only it’s transparent, it’s based on a bitmap(or at least another type of image) too. Since then it kind of bugs me how to make it - now with Kivy, but still no success. However I found some scraps, that may help someone who would like to code it.

On irc @dessant pointed me to these links wiki.libsdl.org, SDL-mirror

LiLi provides a portable package, where is its source available. In Graphics.au3 you can see that the guy uses Win32API, which probably isn’t desired when there is sdl2 and still a little bit of pygame present with Android, but it may give you a picture what it is exactly. This type of Window might drag new users to Kivy if it’d be at least on these commercial platforms such as Windows and Mac.

Links:

• C++ Semi-Transparent Window SDL
• Transparent SDL2 Game
• Background from OS in Window
• Transparent window background
• SDL transparent Window - this one kind of tells me that it may not be possible with sdl2
• SDL transparent primary surface (main window) - however this seems to be promising

[Fuzzyma]

To make a window transparent in windows (the whole - not the background) you need to use the win32 api. The code for this would be as follows:

import win32gui
import win32con
import win32api

# Get the window
handle = win32gui.FindWindow(None, "TitleOfYourWindow")

# Make it a layered window
win32gui.SetWindowLong(handle, win32con.GWL_EXSTYLE, win32gui.GetWindowLong(self.handle, win32con.GWL_EXSTYLE) | win32con.WS_EX_LAYERED)

# make it transparent (alpha between 0 and 255)
win32gui.SetLayeredWindowAttributes(handle, win32api.RGB(0, 0, 0), alpha, win32con.LWA_ALPHA)

That said, doing a PR is no fun if

it probably won’t be merged

However: I am also not capable of doing it because I am not familiar with the kivy code.

I found no way to make the background transparent and allowing custom shapes as windows

[KeyWeeUsr]

Closed by #5252