How Can I Achieve Rainlendar-like Window Positioning in WPF?

Window Positioning in WPF

In WPF, you can modify the positioning behavior of a window to achieve effects similar to Rainlendar's "on desktop" option. Here's how:

SetParent API

To achieve the "on desktop" effect, where the window becomes a child of the Explorer desktop, you can use the SetParent API. This API allows you to set the parent window of a window handle. By setting the parent window to the desktop window handle, you can embed your WPF window within the desktop.

SetWindowPos

For the "on bottom" effect, you can use the SetWindowPos API to position your WPF window at the bottom of the Z-order. This ensures that your window stays at the bottom, even when other windows are opened and closed.

WM_WINDOWPOSCHANGING

To prevent your window from coming to the front when clicked, you can handle the WM_WINDOWPOSCHANGING message. This message is sent by the Windows operating system when the position or size of a window is about to change. By handling this message and intercepting the change, you can force your window to remain at the bottom of the Z-order.

To implement this in C#, you would need to use the following code:

protected override void OnSourceInitialized(EventArgs e)
{
    _handle = new WindowInteropHelper(this).Handle;
    HwndSource source = PresentationSource.FromVisual(this) as HwndSource;
    source.AddHook(WndProc);
}

private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
    if (msg == WM_WINDOWPOSCHANGING)
    {
        var pos = (WINDOWPOS)Marshal.PtrToStructure(lParam, typeof(WINDOWPOS));

        // Force the window to remain at the bottom of the Z-order
        pos.hwndInsertAfter = HWND_BOTTOM;

        Marshal.StructureToPtr(pos, lParam, false);
        handled = true;
    }

    return IntPtr.Zero;
}

By combining the SetParent API, SetWindowPos, and WM_WINDOWPOSCHANGING message handling, you can achieve both the "on desktop" and "on bottom" effects for your WPF window.

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