AnchorManager.h

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// Copyright (c) 2025 Dave R. Smith.
// Malena Framework — Licensed under PolyForm Noncommercial 1.0.0; commercial use requires a paid license. See LICENSE.
 
//
// AnchorManager.h — owns retained anchors and re-solves them.
//
// Anchors live here (external registry) rather than on Positionable, so the trait
// keeps no data member and stays copyable. AppManager calls solveAll() on window
// resize; a solve re-reads each reference's current bounds and re-applies the
// stored Align ops. An object moved externally between solves (a direct
// setPosition, or an animation) is detected and detached — manual control wins.
//
 
#ifndef MALENA_ANCHORMANAGER_H
#define MALENA_ANCHORMANAGER_H
 
#pragma once
 
#include <Malena/Core/malena_export.h>
#include <Malena/Layout/Anchor.h>
#include <cstddef>
#include <unordered_map>
 
namespace ml
{
    class Positionable;
 
    class MALENA_API AnchorManager
    {
    public:
        static void set(Positionable* owner, AnchorOp op, const Positionable* ref, float spacing);

        static void recordBaseline(Positionable* owner);

        static void clear(Positionable* owner);

        static bool hasAnchors(const Positionable* owner);

        static void release(const Positionable* owner);

        static void solveAll();

        static std::size_t anchoredCount();
 
    private:
        struct Entry;
        static std::unordered_map<Positionable*, Entry>& registry();
        static void solveOwner(Positionable* owner, Entry& e);
    };
 
} // namespace ml
 
#endif // MALENA_ANCHORMANAGER_H