Function FindHoveredWindow

tutorials/common/imgui/imgui.cpp:5307–5357

Find window given position, search front-to-back FIXME: Note that we have an inconsequential lag here: OuterRectClipped is updated in Begin(), so windows moved programmatically with SetWindowPos() and not SetNextWindowPos() will have that rectangle lagging by a frame at the time FindHoveredWindow() is called, aka before the next Begin(). Moving window isn't affected.

// with SetWindowPos() and not SetNextWindowPos() will have that rectangle lagging by a frame at the time FindHoveredWindow() is
// called, aka before the next Begin(). Moving window isn't affected.
static void FindHoveredWindow()
{
    ImGuiContext& g = *GImGui;

    ImGuiWindow* hovered_window = NULL;
    ImGuiWindow* hovered_window_ignoring_moving_window = NULL;
    if (g.MovingWindow && !(g.MovingWindow->Flags & ImGuiWindowFlags_NoMouseInputs))
        hovered_window = g.MovingWindow;

    ImVec2 padding_regular = g.Style.TouchExtraPadding;
    ImVec2 padding_for_resize = g.IO.ConfigWindowsResizeFromEdges ? g.WindowsHoverPadding : padding_regular;
    for (int i = g.Windows.Size - 1; i >= 0; i--)
    {
        ImGuiWindow* window = g.Windows[i];
        IM_MSVC_WARNING_SUPPRESS(28182); // [Static Analyzer] Dereferencing NULL pointer.
        if (!window->Active || window->Hidden)
            continue;
        if (window->Flags & ImGuiWindowFlags_NoMouseInputs)
            continue;

        // Using the clipped AABB, a child window will typically be clipped by its parent (not always)
        ImRect bb(window->OuterRectClipped);
        if (window->Flags & (ImGuiWindowFlags_ChildWindow | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_AlwaysAutoResize))
            bb.Expand(padding_regular);
        else
            bb.Expand(padding_for_resize);
        if (!bb.Contains(g.IO.MousePos))
            continue;

        // Support for one rectangular hole in any given window
        // FIXME: Consider generalizing hit-testing override (with more generic data, callback, etc.) (#1512)
        if (window->HitTestHoleSize.x != 0)
        {
            ImVec2 hole_pos(window->Pos.x + (float)window->HitTestHoleOffset.x, window->Pos.y + (float)window->HitTestHoleOffset.y);
            ImVec2 hole_size((float)window->HitTestHoleSize.x, (float)window->HitTestHoleSize.y);
            if (ImRect(hole_pos, hole_pos + hole_size).Contains(g.IO.MousePos))
                continue;
        }

        if (hovered_window == NULL)
            hovered_window = window;
        IM_MSVC_WARNING_SUPPRESS(28182); // [Static Analyzer] Dereferencing NULL pointer.
        if (hovered_window_ignoring_moving_window == NULL && (!g.MovingWindow || window->RootWindow != g.MovingWindow->RootWindow))
            hovered_window_ignoring_moving_window = window;
        if (hovered_window && hovered_window_ignoring_moving_window)
            break;
    }

    g.HoveredWindow = hovered_window;
    g.HoveredWindowUnderMovingWindow = hovered_window_ignoring_moving_window;
}

bool ImGui::IsItemActive()
{