About ImGui::ButtonBehavior Function

[YuDang1024]

I saw this post in the discussion forum：
https://github.com/ocornut/imgui/issues/3379
This is exactly what I need, but there are some problems:
If I want to use the method you provided, can I only monitor the window generated by the Begin() function?
I use Begin("A") to generate window A,
Then in window A, use BeginChild("B") to generate child window B,
Then I use:
CurID = g.HoveredWindow->ID; CurRect = g.HoveredWindow->Rect();
Get the required data，Use for ButtonBehavior function，
Treat CurID and CurRect as the first and second parameters of the ButtonBehavior function.
In other words, I want to use this method to simulate the dragging action in the child window.
But it seems that the child window cannot be the same as the root window. I don't know where is the problem ?

[YuDang1024]

This is my interface structure：

this is my code:

I have followed your suggestion and put this function after BeginChild() and before EndChild().
But when my mouse hits the lower left corner of the sub-window, the CurID and CurRect data has been correctly obtained, but it cannot be dragged by the mouse.
I use this function because I want to provide users with a more comfortable operating environment on the mobile terminal.
Thanks, looking forward to your answer！！

[YuDang1024]

I read the source code of IsWindowFocused function,
May have understood its role,
It can run on my device now, but there are still some problems in the middle of the two drags, which may be because Lua is not a reference value. Or I can solve this problem by recording the last location

[YuDang1024]

This is my Lua code:
For your reference, I did it on a mobile device.
`function LTouchEventHandle:ScrollWhenDraggingOnVoid()
local io = ImGui.GetIO();
local mouse_delta = io.MouseDelta
MouseDelta = ImVec2(0.0, -mouse_delta.y)
local g = ImGui.GetCurrentContext();
local window = g.HoveredWindow;

if ImGui.IsWindowFocused(ImGuiFocusedFlags_.ImGuiFocusedFlags_ChildWindows) then
    if window ~= nil then
        local posScroll = window.Scroll
        ImGui.SetScrollY(window, posScroll.y + mouse_delta.y);
    end
end

end`

[ocornut]

Hello, I don't understand your issue but have answered in #3379.
If your issue appears to be solved, can we close this?