How to create a nonclickable transparent window

[Lee979797]

I want to create a nonclickable transparent window, so that the danmaku message can float across the screen.
I read the previous discussion and it seems to point to #4956

SetWindowLong(this.PlatformImpl.Handle.Handle, GWL_EXSTYLE, Style | WS_EX_LAYERED | WS_EX_TRANSPARENT)
SetLayeredWindowAttributes(this.PlatformImpl.Handle.Handle, 0, 255, 0x2);

I tried

    [DllImport("user32.dll", SetLastError = true)]
    private static extern int GetWindowLong(IntPtr hWnd, int nIndex);

    [DllImport("user32.dll")]
    private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
    
    [DllImport("user32.dll", SetLastError = true)]
    public static extern bool SetLayeredWindowAttributes(IntPtr hwnd, uint crKey, byte bAlpha, uint dwFlags);

    private const int GWL_EXSTYLE = -20;
    private const int WS_EX_TRANSPARENT = 0x20;
    private const int WS_EX_LAYERED = 0x80000;

    ...
        // this.PlatformImpl.Handle.Handle Seems to be unavailable
        var handle = TryGetPlatformHandle().Handle;
        int style = GetWindowLong(handle, GWL_EXSTYLE);
        SetWindowLong(handle, GWL_EXSTYLE, style | WS_EX_LAYERED | WS_EX_TRANSPARENT);
        SetLayeredWindowAttributes(handle, 0, 255, 0x2);

But this didn't work, am I doing something wrong? This is my first attempt at C# desktop application development😂

I want to implement a window like electorn this:

danmakuWindow = new BrowserWindow({
        title: 'DanmakuWindow ',
        x: x,
        y: y,
        width: 1920,
        height: 1080,
        transparent: true,
        frame: false,
        thickFrame: true,
        resizable: false,
        alwaysOnTop: true,
        center: true,
        focusable: false,
        webPreferences: {
            preload
        }
    });
    danmakuWindow.setAlwaysOnTop(true, 'pop-up-menu'); 
    danmakuWindow.maximize();
    danmakuWindow.setIgnoreMouseEvents(true);  // nonclickable

[Hawgk]

Having the same issue. There seems to be no way to make the window click-through. Or maybe we're missing something?

[thevortexcloud]

There is, Avalonia just does not do it out of the box. You need to use native APIs yourself to do it. On Windows it's very easy. Linux is somewhat harder.

#11911