ImGuiConfigFlags_NoMouseCursorChange behaviour ?

[DaveInDev]

hi @eliasdaler,

I am fighting with the mouse cursor in my app...
I choose ConfigWindowsResizeFromEdges = true to resize imgui windows by their borders.

When I don't set ImGuiConfigFlags_NoMouseCursorChange , your SFML backend uses the correct "resize" cursor on the edges of a ImGUI window, but the resize cursor is not shown anymore on the edges of the main window.

And if I set ImGuiConfigFlags_NoMouseCursorChange , it's the opposite : no more cursor change on Imgui borders, but ok on main window borders.

I cannot figure out how to enable both behaviours... Do you have an idea ?

[eliasdaler]

See #111 - unfortunately I didn't have time to look closer into this. It looks like a SFML bug for me and can't be easily fixed using ImGui-SFML's code only

[DaveInDev]

waooo... I wonder what I can tell to SFML people about it. I don't think they will go into ImGui and Imgui-SFML.... Thanks for your answer anyway.

[DaveInDev]

I see that the issue was already discussed with a russian guy in #110 . But the discussion was in russian. Can you tell me if you found a solution ?

[eliasdaler]

There is no solution currently. The research is needed how SFML and SDL handle mouse cursors - the behaviour differs and my and the PR creator's previous research wasn't successful.

[DaveInDev]

So as far I understood, it works ok with SDL backend, but not with SMFL backend. So you think it's not a problem of IMGUI nor Imgui-SFML but a problem of SFML itself ? I don't know how I can explain that to the SFML team...
Anyway, I tried and posted this
https://en.sfml-dev.org/forums/index.php?topic=27180.0
if case you want to add more explanations for the specialists around...

[DaveInDev]

For those who needs, I just found a workaround. Switching the ImGuiConfigFlags_NoMouseCursorChange flag when ImGui really needs it. Here it is (it's a raw copy of my code, just to understand, but adapt to your own code)

[quote]
static ImGuiIO& ioImgui = ImGui::GetIO();

	static bool imguiHasCursorPrev = true;
	bool imguiHasCursor = ioImgui.WantCaptureMouse || ioImgui.WantCaptureKeyboard;

	if (imguiHasCursor != imguiHasCursorPrev)
	{
		if (imguiHasCursor)
		{
			ioImgui.ConfigFlags &= !ImGuiConfigFlags_NoMouseCursorChange;
		}
		else
		{
			ioImgui.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange;
			window.setMouseCursor(cursorDefault);
		}
		imguiHasCursorPrev = imguiHasCursor;
	}

[/quote]

note : "window" is my main sfml window.
and cursorDefault.loadFromSystem(sf::Cursor::Arrow);

Thx @eliasdaler for your answers, it helped me.

[Nightmare82]

Thanks a lot for the workaround @DaveInDev this worked perfectly for me too!

[gitpaul0]

Great,

one small correction - to preserve flags it should be:
ioImgui.ConfigFlags &= ~ImGuiConfigFlags_NoMouseCursorChange;
not
ioImgui.ConfigFlags &= !ImGuiConfigFlags_NoMouseCursorChange;