notice.h

//
// Copyright 2021 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_USD_AR_NOTICE_H
#define PXR_USD_AR_NOTICE_H
 
#include "pxr/pxr.h"
 
#include "pxr/usd/ar/api.h"
#include "pxr/usd/ar/resolverContext.h"
 
#include "pxr/base/tf/notice.h"
 
#include <functional>
 
PXR_NAMESPACE_OPEN_SCOPE
 
class ArNotice
{
public:
    class ResolverNotice
        : public TfNotice
    {
    public:
        AR_API virtual ~ResolverNotice();
    protected:
        AR_API ResolverNotice();
    };
 
    class ResolverChanged 
        : public ResolverNotice
    {
    public:
        AR_API
        ResolverChanged();
 
        AR_API
        ResolverChanged(
            const std::function<bool(const ArResolverContext&)>& affectsFn);
 
        ResolverChanged(const ArResolverContext& ctx)
            : _affects(
                [ctx](const ArResolverContext& otherCtx) {
                    return otherCtx.Contains(ctx);
                })
        {
        }
 
        template <
            class ContextObj,
            std::enable_if_t<ArIsContextObject<ContextObj>::value>* = nullptr
        >
        ResolverChanged(
            const ContextObj& contextObj)
            : _affects(
                [contextObj](const ArResolverContext& ctx) {
                    return ctx.Contains(contextObj);
                })
        {
        }
 
        AR_API
        virtual ~ResolverChanged();
 
        AR_API 
        bool AffectsContext(const ArResolverContext& ctx) const;
 
    private:
        std::function<bool(const ArResolverContext&)> _affects;
    };
 
};
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif