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#pragma once
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#include "SplineCurveModel.h"
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#include "ItemCurve.h"
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#include <vector>
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class CSigmaDoc; // forward declaration for GetDoc()
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/**
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* @brief 样条拖拽状态
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*
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* 集中管理鼠标按下/拖拽位置及预览点，与 CurveEditorSpline 共享。
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*/
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struct SplineDragState
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{
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CPoint screenDownPoint;
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CPoint2D worldDownPoint;
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CPoint2D worldLastPoint;
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bool isLeftButtonDownDuringMove;
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CPointList previewPoints;
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void Reset()
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{
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worldDownPoint = CPoint2D(0, 0);
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worldLastPoint = CPoint2D(0, 0);
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isLeftButtonDownDuringMove = false;
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previewPoints.RemoveAll();
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}
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void StartDrag(CPoint screen, CPoint2D world)
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{
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screenDownPoint = screen;
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worldDownPoint = world;
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worldLastPoint = world;
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previewPoints.RemoveAll();
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}
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void UpdateLast(CPoint2D world) { worldLastPoint = world; }
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bool HasMoved() const { return !(worldLastPoint == worldDownPoint); }
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};
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/**
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* @brief 拖拽流水线上下文接口
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*
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* CurveEditorSpline 实现，供 SplineDragPipeline 访问文档与模型。
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*/
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struct ISplineDragPipelineContext
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{
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virtual ~ISplineDragPipelineContext() = default;
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virtual CSigmaDoc* GetDoc() = 0;
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virtual POSITION GetPos() = 0;
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virtual int GetHandleIndex() = 0;
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virtual void WriteModelToDocCurve() = 0;
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virtual void Invalidate() = 0;
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virtual void AttachProcess(CPointList& oldPoints, CPointList& newPoints) = 0;
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};
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/**
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* @brief 样条拖拽流水线
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*
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* 根据拖拽状态计算并应用/预览效果，流程：取曲线 → 重建样条 → 写回 → 同步模型。
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*/
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class SplineDragPipeline
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{
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public:
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SplineDragPipeline(SplineCurveModel& model, SplineDragState& dragState, ISplineDragPipelineContext* pContext);
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/**
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* @brief 执行拖拽步骤，isPreview 为 true 时仅输出预览点到 pListForPreview
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*/
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bool ProcessDragStep(bool isPreview, CPointList* pListForPreview);
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private:
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bool GetCurveForDragEdit(bool isPreview, CCurveEx*& pValue, int& handleIndex, CPointList* pListForPreview);
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bool GetDraggedSegmentAndAttachContext(std::vector<dfPoint>& segmentVec);
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bool WriteDraggedSegmentToCurve(CCurveEx* pValue, const std::vector<dfPoint>& segmentVec);
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void SyncControlPointsAndNotify(int handleIndex);
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void EndDragEdit(CCurveEx* pValue, bool isPreview, CPointList* pList);
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SplineCurveModel* m_pModel;
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SplineDragState* m_pDragState;
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ISplineDragPipelineContext* m_pContext;
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};
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