ghswatchcursor.cpp

VC开发环境下

// GHSwatchCursor.cpp : Implementation of CGHSwatchCursor

#include "stdafx.h"
#include "GHSwatchCursor.h"
#include ".\ghswatchcursor.h"
#include "SwatchData.h"

// CGHSwatchCursor


void    NextCursor(std::list<CSwatchData*>::iterator& pos);
void    DummyNextCursor(std::list<CSwatchData*>::iterator& pos);

//Advance the position of the cursor by one and return the Row object at that position
STDMETHODIMP CGHSwatchCursor::NextRow(IGHRow** row)
{
	
	ATLASSERT(m_pGHSwatch!=NULL);
	
	if(row==NULL)
		return E_POINTER;

	
	m_mfNextFunc(m_Cursor);  //Next cursor
	m_mfNextFunc=NextCursor;

	if (IsEOF())  //At the end
	{
		*row=NULL;
		return S_OK;
	}

	HRESULT hr;
	if (m_bRecycling)  //Recycling Cursor
	{
		ATLASSERT(m_pRecyclingRow!=NULL);
		hr=m_pRecyclingRow->Initial(*m_Cursor);
		hr=m_pRecyclingRow->QueryInterface(IID_IGHRow,(void**)row);
	}
	else           //UnRecycling cursor, create a new IGHRow
	{
		CComObject<CGHRow> *pGHRow;
		hr=CComObject<CGHRow>::CreateInstance(&pGHRow);
		if(FAILED(hr))
			return hr;

		hr=pGHRow->InitialOnce(m_pGHSwatch,m_bReadOnly);
		hr=pGHRow->Initial(*m_Cursor);
		hr=pGHRow->QueryInterface(IID_IGHRow,(void**)row);
	}
	
	return hr;
}

//Insert a new row into the Swatch using the values of the input row before current cursor
//
STDMETHODIMP CGHSwatchCursor::InsertRow(IGHRow* row)
{
	ATLASSERT(!m_bReadOnly); //Use read-only cursor to modify 

	/*if (m_bReadOnly)
		return E_UNEXPECTED;*/

	if(row==NULL)
		return E_POINTER;

	//CComPtr<IUnknown> cpUnknown;
	//HRESULT hr;
	//hr=row->QueryInterface(IID_IUnknown,(void**)&cpUnknown);
	//
	//if(S_OK==hr)
	//{
	//	//

	//	//DO NOT use the _ATL_DEBUG_INTERFACES pre-compiler macro,
	//	//'cause it's use the thunk IUnknown
	//	CComObject<CGHRow> *pRow=(CComObject<CGHRow> *)cpUnknown.p;
	//	ATLASSERT(pRow);
	//	CSwatchData* pSwatchData;
	//	if (pRow->m_bRequireDelete) 
	//	{
	//		pSwatchData=pRow->Detch();
	//	}
	//	else
	//	{

	//	}
	//	m_Cursor=m_pGHSwatch->m_listSwatch.insert(m_Cursor,pSwatchData);
	//	
	//	//Initial input row to the reference of Swatch
	//	pRow->InitialOnce(m_pGHSwatch,m_bReadOnly);
	//	pRow->Initial(pSwatchData);
	//	
	//}
	//
	//return hr;

	LONG lSize;
	m_pGHSwatch->get_FieldCount(&lSize); //m_cpIndexs->get_Count(&lSize);

	CSwatchData* pSwatchData=new CSwatchData(lSize);
	
	FLOAT fValue;
	for (LONG i=0;i<lSize;i++) 
	{
		row->get_Value(i,&fValue);
		pSwatchData->set_Value(i,fValue);
	}
	m_pGHSwatch->m_listSwatch.insert(m_Cursor,pSwatchData);
	return S_OK;
}

//Delete the existing Row in the swatch corresponding to the current position of the cursor,
//and set the cursor to next available position
STDMETHODIMP CGHSwatchCursor::DeleteRow()
{
	ATLASSERT(!IsEOF());     //At the end
	ATLASSERT(!m_bReadOnly); //Use read-only cursor to modify 

	delete *m_Cursor;
	m_Cursor=m_pGHSwatch->m_listSwatch.erase(m_Cursor);
	m_mfNextFunc=DummyNextCursor;
	return S_OK;
}

STDMETHODIMP CGHSwatchCursor::Flush(void)
{
	return S_OK;
}


//Called by CGHSwatch::Update or CGHSwatch::Search after create a CComobject<CGHSwatchCursor>,use this to initial
HRESULT CGHSwatchCursor::Initial(CComObject<CGHSwatch>* pGHSwatch,
								 BOOL bReadOnly /* = TRUE */,BOOL bRecyling/* =TRUE */)
{
	if(NULL==pGHSwatch)
		return E_POINTER;

	//Add a reference of IGHSwatch,avoid the below situation:
	//IGHSwatch has released,but the cursor is still alive
	if (m_pGHSwatch) 
		m_pGHSwatch->Release();
	
	m_pGHSwatch=pGHSwatch;
	m_pGHSwatch->AddRef();

	//Initial the cursor at the begin
	Reset();

	m_bReadOnly=bReadOnly;
	m_bRecycling=bRecyling;

	HRESULT hr=S_OK;
	if (m_bRecycling&&m_pRecyclingRow==NULL)	 //Create Recycling IGHRow
	{
		hr=CComObject<CGHRow>::CreateInstance(&m_pRecyclingRow);     

		if (hr==S_OK)
		{
			m_pRecyclingRow->AddRef();
			m_pRecyclingRow->InitialOnce(pGHSwatch,bReadOnly);
		}
	}

	return hr;

}

//Reset the cursor to the begin
STDMETHODIMP CGHSwatchCursor::Reset(void)
{
	m_mfNextFunc=DummyNextCursor;
	m_Cursor=m_pGHSwatch->m_listSwatch.begin();
	return S_OK;
}

BOOL CGHSwatchCursor::IsEOF()
{
	return m_Cursor==m_pGHSwatch->m_listSwatch.end();
}

void NextCursor(std::list<CSwatchData*>::iterator& pos)
{
	++pos;
}

void DummyNextCursor(std::list<CSwatchData*>::iterator& pos)
{

}