Method FindBestWindowPosForPopup

include/imgui/imgui.cpp:12781–12835

}

ImVec2 ImGui::FindBestWindowPosForPopup(ImGuiWindow* window)
{
    ImGuiContext& g = *GImGui;

    ImRect r_outer = GetPopupAllowedExtentRect(window);
    if (window->Flags & ImGuiWindowFlags_ChildMenu)
    {
        // Child menus typically request _any_ position within the parent menu item, and then we move the new menu outside the parent bounds.
        // This is how we end up with child menus appearing (most-commonly) on the right of the parent menu.
        IM_ASSERT(g.CurrentWindow == window);
        ImGuiWindow* parent_window = g.CurrentWindowStack[g.CurrentWindowStack.Size - 2].Window;
        float horizontal_overlap = g.Style.ItemInnerSpacing.x; // We want some overlap to convey the relative depth of each menu (currently the amount of overlap is hard-coded to style.ItemSpacing.x).
        ImRect r_avoid;
        if (parent_window->DC.MenuBarAppending)
            r_avoid = ImRect(-FLT_MAX, parent_window->ClipRect.Min.y, FLT_MAX, parent_window->ClipRect.Max.y); // Avoid parent menu-bar. If we wanted multi-line menu-bar, we may instead want to have the calling window setup e.g. a NextWindowData.PosConstraintAvoidRect field
        else
            r_avoid = ImRect(parent_window->Pos.x + horizontal_overlap, -FLT_MAX, parent_window->Pos.x + parent_window->Size.x - horizontal_overlap - parent_window->ScrollbarSizes.x, FLT_MAX);
        return FindBestWindowPosForPopupEx(window->Pos, window->Size, &window->AutoPosLastDirection, r_outer, r_avoid, ImGuiPopupPositionPolicy_Default);
    }
    if (window->Flags & ImGuiWindowFlags_Popup)
    {
        return FindBestWindowPosForPopupEx(window->Pos, window->Size, &window->AutoPosLastDirection, r_outer, ImRect(window->Pos, window->Pos), ImGuiPopupPositionPolicy_Default); // Ideally we'd disable r_avoid here
    }
    if (window->Flags & ImGuiWindowFlags_Tooltip)
    {
        // Position tooltip (always follows mouse + clamp within outer boundaries)
        // FIXME:
        // - Too many paths. One problem is that FindBestWindowPosForPopupEx() doesn't allow passing a suggested position (so touch screen path doesn't use it by default).
        // - Drag and drop tooltips are not using this path either: BeginTooltipEx() manually sets their position.
        // - Require some tidying up. In theory we could handle both cases in same location, but requires a bit of shuffling
        //   as drag and drop tooltips are calling SetNextWindowPos() leading to 'window_pos_set_by_api' being set in Begin().
        IM_ASSERT(g.CurrentWindow == window);
        const float scale = g.Style.MouseCursorScale;
        const ImVec2 ref_pos = NavCalcPreferredRefPos(ImGuiWindowFlags_Tooltip);

        if (g.IO.MouseSource == ImGuiMouseSource_TouchScreen && NavCalcPreferredRefPosSource(ImGuiWindowFlags_Tooltip) == ImGuiInputSource_Mouse)
        {
            ImVec2 tooltip_pos = ref_pos + TOOLTIP_DEFAULT_OFFSET_TOUCH * scale - (TOOLTIP_DEFAULT_PIVOT_TOUCH * window->Size);
            if (r_outer.Contains(ImRect(tooltip_pos, tooltip_pos + window->Size)))
                return tooltip_pos;
        }

        ImVec2 tooltip_pos = ref_pos + TOOLTIP_DEFAULT_OFFSET_MOUSE * scale;
        ImRect r_avoid;
        if (g.NavCursorVisible && g.NavHighlightItemUnderNav && !g.IO.ConfigNavMoveSetMousePos)
            r_avoid = ImRect(ref_pos.x - 16, ref_pos.y - 8, ref_pos.x + 16, ref_pos.y + 8);
        else
            r_avoid = ImRect(ref_pos.x - 16, ref_pos.y - 8, ref_pos.x + 24 * scale, ref_pos.y + 24 * scale); // FIXME: Hard-coded based on mouse cursor shape expectation. Exact dimension not very important.
        //GetForegroundDrawList()->AddRect(r_avoid.Min, r_avoid.Max, IM_COL32(255, 0, 255, 255));

        return FindBestWindowPosForPopupEx(tooltip_pos, window->Size, &window->AutoPosLastDirection, r_outer, r_avoid, ImGuiPopupPositionPolicy_Tooltip);
    }
    IM_ASSERT(0);
    return window->Pos;
}

//-----------------------------------------------------------------------------
// [SECTION] WINDOW FOCUS