ILabelPicker.h

// Copyright eeGeo Ltd (2012-2014), All Rights Reserved

#pragma once

#include "Labels.h"
#include "Types.h"
#include "VectorMath.h"
#include "LabelLayer.h"


#include "LabelViewTypes.h"

namespace Eegeo
{
    namespace Labels
    {

        struct LabelPickQuery
        {
        public:
            inline static u32 LabelLayerToPickingGroupMask(LabelLayer::IdType labelLayerId)
            {
                return 1 << labelLayerId;
            }
            
            inline static u32 LabelComponentToMask(LabelComponent::Type labelComponent)
            {
                return 1 << labelComponent;
            }
        
            static LabelPickQuery Make(const v2& screenPoint);
            
            static LabelPickQuery Make(const v2& screenPoint, LabelLayer::IdType labelLayerId);
            
            static LabelPickQuery Make(const v2& screenPoint, LabelLayer::IdType labelLayerId, LabelComponent::Type labelComponentType);
            
            LabelPickQuery(const v2& screenPoint, u32 pickingGroupMask, u32 labelComponentMask)
            : m_screenPoint(screenPoint)
            , m_pickingGroupMask(pickingGroupMask)
            , m_labelComponentMask(labelComponentMask)
            {}
            
            const v2& ScreenPoint() const { return m_screenPoint; }
            
            u32 PickingGroupMask() const { return m_pickingGroupMask; }
            
            u32 LabelComponentMask() const { return m_labelComponentMask; }
            
        private:
            v2 m_screenPoint;
            u32 m_pickingGroupMask;
            u32 m_labelComponentMask;
        };
        
        struct LabelPickResult
        {
        public:
        
            static LabelPickResult Make(const LabelView* pLabelView,
                                        LabelComponent::Type labelComponentType);
                                        
        
            LabelPickResult(bool didHit,
                            LabelComponent::Type labelComponentType,
                            const IAnchoredLabel* pAnchoredLabel
                            )
            : m_didHit(didHit)
            , m_labelComponentType(labelComponentType)
            , m_pAnchoredLabel(pAnchoredLabel)
            {}
            
            bool DidHit() const
            {
                return m_didHit;
            }
            
            bool operator()() const
            {
                return DidHit();
            }
            
            const IAnchoredLabel* GetLabelModel() const { return m_pAnchoredLabel; }
        
            LabelComponent::Type GetLabelComponentType() const { return m_labelComponentType; }
            
        private:
            bool m_didHit;
            LabelComponent::Type m_labelComponentType;
            const IAnchoredLabel* m_pAnchoredLabel;
        };
 
        
        class ILabelPicker
        {
        public:
            virtual ~ILabelPicker() {}
            
            virtual LabelPickResult Pick(const LabelPickQuery& query) = 0;
        };
    }
}