Method GetIDFromRectangle

core/src/imgui/imgui.cpp:2997–3004

This is only used in rare/specific situations to manufacture an ID out of nowhere.

// This is only used in rare/specific situations to manufacture an ID out of nowhere.
ImGuiID ImGuiWindow::GetIDFromRectangle(const ImRect& r_abs)
{
    ImGuiID seed = IDStack.back();
    const int r_rel[4] = { (int)(r_abs.Min.x - Pos.x), (int)(r_abs.Min.y - Pos.y), (int)(r_abs.Max.x - Pos.x), (int)(r_abs.Max.y - Pos.y) };
    ImGuiID id = ImHashData(&r_rel, sizeof(r_rel), seed);
    ImGui::KeepAliveID(id);
    return id;
}

static void SetCurrentWindow(ImGuiWindow* window)
{