Method UpdateMouseWheel

plugins/Cardinal/src/DearImGui/imgui.cpp:3814–3897

}

void ImGui::UpdateMouseWheel()
{
    ImGuiContext& g = *GImGui;

    // Reset the locked window if we move the mouse or after the timer elapses
    if (g.WheelingWindow != NULL)
    {
        g.WheelingWindowTimer -= g.IO.DeltaTime;
        if (IsMousePosValid() && ImLengthSqr(g.IO.MousePos - g.WheelingWindowRefMousePos) > g.IO.MouseDragThreshold * g.IO.MouseDragThreshold)
            g.WheelingWindowTimer = 0.0f;
        if (g.WheelingWindowTimer <= 0.0f)
        {
            g.WheelingWindow = NULL;
            g.WheelingWindowTimer = 0.0f;
        }
    }

    if (g.IO.MouseWheel == 0.0f && g.IO.MouseWheelH == 0.0f)
        return;

    if ((g.ActiveId != 0 && g.ActiveIdUsingMouseWheel) || (g.HoveredIdPreviousFrame != 0 && g.HoveredIdPreviousFrameUsingMouseWheel))
        return;

    ImGuiWindow* window = g.WheelingWindow ? g.WheelingWindow : g.HoveredWindow;
    if (!window || window->Collapsed)
        return;

    // Zoom / Scale window
    // FIXME-OBSOLETE: This is an old feature, it still works but pretty much nobody is using it and may be best redesigned.
    if (g.IO.MouseWheel != 0.0f && g.IO.KeyCtrl && g.IO.FontAllowUserScaling)
    {
        StartLockWheelingWindow(window);
        const float new_font_scale = ImClamp(window->FontWindowScale + g.IO.MouseWheel * 0.10f, 0.50f, 2.50f);
        const float scale = new_font_scale / window->FontWindowScale;
        window->FontWindowScale = new_font_scale;
        if (window == window->RootWindow)
        {
            const ImVec2 offset = window->Size * (1.0f - scale) * (g.IO.MousePos - window->Pos) / window->Size;
            SetWindowPos(window, window->Pos + offset, 0);
            window->Size = ImFloor(window->Size * scale);
            window->SizeFull = ImFloor(window->SizeFull * scale);
        }
        return;
    }

    // Mouse wheel scrolling
    // If a child window has the ImGuiWindowFlags_NoScrollWithMouse flag, we give a chance to scroll its parent
    if (g.IO.KeyCtrl)
        return;

    // As a standard behavior holding SHIFT while using Vertical Mouse Wheel triggers Horizontal scroll instead
    // (we avoid doing it on OSX as it the OS input layer handles this already)
    const bool swap_axis = g.IO.KeyShift && !g.IO.ConfigMacOSXBehaviors;
    const float wheel_y = swap_axis ? 0.0f : g.IO.MouseWheel;
    const float wheel_x = swap_axis ? g.IO.MouseWheel : g.IO.MouseWheelH;

    // Vertical Mouse Wheel scrolling
    if (wheel_y != 0.0f)