Method NavCalcPreferredRefPos

src/imgui/imgui.cpp:13408–13447

}

static ImVec2 ImGui::NavCalcPreferredRefPos()
{
    ImGuiContext& g = *GImGui;
    ImGuiWindow* window = g.NavWindow;
    ImGuiInputSource source = NavCalcPreferredRefPosSource();

    const bool activated_shortcut = g.ActiveId != 0 && g.ActiveIdFromShortcut && g.ActiveId == g.LastItemData.ID;

    if (source != ImGuiInputSource_Mouse && !activated_shortcut && window == NULL)
        source = ImGuiInputSource_Mouse;

    // Testing for !activated_shortcut here could in theory be removed if we decided that activating a remote shortcut altered one of the g.NavDisableXXX flag.
    if (source == ImGuiInputSource_Mouse)
    {
        // Mouse (we need a fallback in case the mouse becomes invalid after being used)
        // The +1.0f offset when stored by OpenPopupEx() allows reopening this or another popup (same or another mouse button) while not moving the mouse, it is pretty standard.
        // In theory we could move that +1.0f offset in OpenPopupEx()
        ImVec2 p = IsMousePosValid(&g.IO.MousePos) ? g.IO.MousePos : g.MouseLastValidPos;
        return ImVec2(p.x + 1.0f, p.y);
    }
    else
    {
        // When navigation is active and mouse is disabled, pick a position around the bottom left of the currently navigated item
        ImRect ref_rect;
        if (activated_shortcut)
            ref_rect = g.LastItemData.NavRect;
        else if (window != NULL)
            ref_rect = WindowRectRelToAbs(window, window->NavRectRel[g.NavLayer]);

        // Take account of upcoming scrolling (maybe set mouse pos should be done in EndFrame?)
        if (window != NULL && window->LastFrameActive != g.FrameCount && (window->ScrollTarget.x != FLT_MAX || window->ScrollTarget.y != FLT_MAX))
        {
            ImVec2 next_scroll = CalcNextScrollFromScrollTargetAndClamp(window);
            ref_rect.Translate(window->Scroll - next_scroll);
        }
        ImVec2 pos = ImVec2(ref_rect.Min.x + ImMin(g.Style.FramePadding.x * 4, ref_rect.GetWidth()), ref_rect.Max.y - ImMin(g.Style.FramePadding.y, ref_rect.GetHeight()));
        ImGuiViewport* viewport = GetMainViewport();
        return ImTrunc(ImClamp(pos, viewport->Pos, viewport->Pos + viewport->Size)); // ImTrunc() is important because non-integer mouse position application in backend might be lossy and result in undesirable non-zero delta.
    }
}

float ImGui::GetNavTweakPressedAmount(ImGuiAxis axis)
{