Container.h

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// Container.h
//
// Copyright (c) 2015 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 "BaseContainer.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 Container : public BaseContainer
{
    using SUPER = BaseContainer;

public:
    Container(Display &display, uiLayoutFlags_t layoutFlags = 0) :
        SUPER(display, layoutFlags), focusedChild(nullptr) { }
    Container(Display &display, const Vec2 &size, bool clip = true,
        uiLayoutFlags_t layoutFlags = 0) :
        SUPER(display, size, clip, layoutFlags), focusedChild(nullptr) { }
    virtual ~Container() { }

public:
    bool OnAction() override
    {
        if (focusedChild) {
            return focusedChild->OnAction();
        }
        return false;
    }

    bool OnNavigate(const Control::Nav &nav) override
    {
        if (focusedChild) {
            return focusedChild->OnNavigate(nav);
        }
        return false;
    }

protected:
    void OnChildRequestedFocus(UiViewModel &child) override;
    void OnChildRelinquishedFocus(UiViewModel &child,
        const Control::Nav &nav) override;

private:
    void FocusPrevFrom(children_t::iterator startingPoint,
        const Control::Nav &nav);
    void FocusNextFrom(children_t::iterator startingPoint,
        const Control::Nav &nav);

public:
    bool TryFocus(const Control::Nav &nav = Control::Nav::NEUTRAL) override;
    void DropFocus() override;

public:
    // Public forwards of container manipulation functions.

    template<class T, class... Args>
    typename std::enable_if<std::is_base_of<UiViewModel, T>::value,
        std::shared_ptr<T>>::type
    NewChild(Args&&... args)
    {
        return SUPER::NewChild<T>(std::forward<Args>(args)...);
    }

    template<class T>
    typename std::enable_if<std::is_base_of<UiViewModel, T>::value,
        std::shared_ptr<T>
        >::type
    RemoveChild(const std::shared_ptr<T> &child)
    {
        if (child.get() == focusedChild) {
            child->DropFocus();
            focusedChild = nullptr;
            RelinquishFocus(Control::Nav::NEUTRAL);
        }
        return SUPER::RemoveChild(child);
    }

    template<class T>
    typename std::enable_if<std::is_base_of<UiViewModel, T>::value,
        std::shared_ptr<T>
        >::type
    ReorderChild(const std::shared_ptr<T> &child, size_t idx)
    {
        return SUPER::ReorderChild(child, idx);
    }

    void Clear() override;

    void Reserve(size_t capacity) override { SUPER::Reserve(capacity); }

private:
    UiViewModel *focusedChild;
};

}  // namespace Display
}  // namespace HoverRace

#undef MR_DllDeclare