ViewModel.h

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// ViewModel.h
//
// Copyright (c) 2013 Michael Imamura.
//
// Licensed under GrokkSoft HoverRace SourceCode License v1.0(the "License");
// you may not use this file except in compliance with the License.
//
// A copy of the license should have been attached to the package from which
// you have taken this file. If you can not find the license you can not use
// this file.
//
//
// The author makes no representations about the suitability of
// this software for any purpose.  It is provided "as is" "AS IS",
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied.
//
// See the License for the specific language governing permissions
// and limitations under the License.

#pragma once

#include "Display.h"
#include "View.h"

#include "ViewAttacher.h"

#if defined(_WIN32) && defined(HR_ENGINE_SHARED)
#   ifdef MR_ENGINE
#       define MR_DllDeclare   __declspec( dllexport )
#   else
#       define MR_DllDeclare   __declspec( dllimport )
#   endif
#else
#   define MR_DllDeclare
#endif

namespace HoverRace {
    namespace Display {
        class Display;
    }
}

namespace HoverRace {
namespace Display {

class MR_DllDeclare ViewModel
{
    public:
        ViewModel() : needsLayout(true) { }
        virtual ~ViewModel() { }

    public:
        virtual void AttachView(Display &disp) = 0;
        void SetView(std::unique_ptr<View> &&view) { this->view = std::move(view); }
        View *GetView() const { return view.get(); }

    protected:
        template<class T>
        void AttachViewDynamic(Display &disp, T *self)
        {
            dynamic_cast<ViewAttacher<T>&>(disp).AttachView(*self);
        }

    protected:
        void RequestLayout() { needsLayout = true; }

        virtual void Layout() { }

    public:
        virtual Vec3 Measure() { return view ? view->Measure() : Vec3(0, 0, 0); }

        void PrepareRender()
        {
            if (needsLayout) {
                Layout();
                needsLayout = false;
            }
            if (view) view->PrepareRender();
        }

        void Render() { if (view) view->Render(); }

    protected:
        virtual void FireModelUpdate(int prop) { if (view) view->OnModelUpdate(prop); }

    private:
        bool needsLayout;
        std::unique_ptr<View> view;
};

}  // namespace Display
}  // namespace HoverRace

#undef MR_DllDeclare