koobas.hobune.stream
Detect the display of current mouse position (Windows)
Is there any way, to detect the display where the current mouse cursor is?
Example
Display0: (x=0, y=0, w=1920, h=1080)
Display1: (x=1920, y=0, w=1920, h=1080)
MousePos: (x=2000, y=1000)
Should give me Index 1, because the mouse is on Display1.
With the following code, I'am able to get a list of all displays with the MonitorArea: https://forum.unity3d.com/threads/c-trying-to-get-for-each-display-displays-the-friendlyname-and-vendorsname.398190/
I get the display names: \\.\DISPLAY1, \\.\DISPLAY2, ...
With the following code I can get the absolute mouse coords:
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool GetCursorPos(out MousePosition lpMousePosition);
[StructLayout(LayoutKind.Sequential)]
public struct MousePosition {
public int x;
public int y;
public override string ToString() {
return "[" + x + ", " + y + "]";
}
}
So I'am able to get the device name of the display by checking the cursor position against all monitor areas.
The problem is, that Unity uses a different display order. Neither with nor without the command line option -multidisplay Unitys display order matches the Windows display order.
The class Displayhave no information about its area (only width, height but no x, y).
I found a solution:
Get absolute mouse coords sx, sy with GetCursorPos
Get relative mouse coords with
r = Display.RelativeMouseAt(new Vector3(sx, sy))Use the z coordinate:
displayIndex = (int) r.z
displayIndex is the index of the display in the Display.displays array.
