// callback from edit session for starting composition
HRESULT TextService::doStartCompositionEditSession(TfEditCookie cookie, StartCompositionEditSession* session) {
ITfContext* context = session->context();
ITfContextComposition* contextComposition;
if(context->QueryInterface(IID_ITfContextComposition, (void**)&contextComposition) == S_OK) {
// get current insertion point in the current context
ITfRange* range = NULL;
ITfInsertAtSelection* insertAtSelection;
if(context->QueryInterface(IID_ITfInsertAtSelection, (void **)&insertAtSelection) == S_OK) {
// get current selection range & insertion position (query only, did not insert any text)
insertAtSelection->InsertTextAtSelection(cookie, TF_IAS_QUERYONLY, NULL, 0, &range);
insertAtSelection->Release();
}
if(range) {
if(contextComposition->StartComposition(cookie, range, (ITfCompositionSink*)this, &composition_) == S_OK) {
// according to the TSF sample provided by M$, we need to reset current
// selection here. (maybe the range is altered by StartComposition()?
// So mysterious. TSF is absolutely overly-engineered!
TF_SELECTION selection;
selection.range = range;
selection.style.ase = TF_AE_NONE;
selection.style.fInterimChar = FALSE;
context->SetSelection(cookie, 1, &selection);
// we did not release composition_ object. we store it for use later
}
range->Release();
}
contextComposition->Release();
}
return S_OK;
}
STDAPI CStartCompositionEditSession::DoEditSession(TfEditCookie ec)
{
ITfInsertAtSelection *pInsertAtSelection = NULL;
ITfRange *pRangeInsert = NULL;
ITfContextComposition *pContextComposition = NULL;
ITfComposition *pComposition = NULL;
HRESULT hr = E_FAIL;
// we need a special interface to insert text at the selection
if (_pContext->QueryInterface(IID_ITfInsertAtSelection, (void **)&pInsertAtSelection) != S_OK)
{
goto Exit;
}
// insert the text
if (pInsertAtSelection->InsertTextAtSelection(ec, TF_IAS_QUERYONLY, NULL, 0, &pRangeInsert) != S_OK)
{
goto Exit;
}
// get an interface on the context we can use to deal with compositions
if (_pContext->QueryInterface(IID_ITfContextComposition, (void **)&pContextComposition) != S_OK)
{
goto Exit;
}
// start the new composition
if ((pContextComposition->StartComposition(ec, pRangeInsert, _pTextService, &pComposition) == S_OK) && (pComposition != NULL))
{
// Store the pointer of this new composition object in the instance
// of the CTextService class. So this instance of the CTextService
// class can know now it is in the composition stage.
_pTextService->_SetComposition(pComposition);
//
// set selection to the adjusted range
//
TF_SELECTION tfSelection;
tfSelection.range = pRangeInsert;
tfSelection.style.ase = TF_AE_NONE;
tfSelection.style.fInterimChar = FALSE;
_pContext->SetSelection(ec, 1, &tfSelection);
}
Exit:
if (pContextComposition != NULL)
pContextComposition->Release();
if (pRangeInsert != NULL)
pRangeInsert->Release();
if (pInsertAtSelection != NULL)
pInsertAtSelection->Release();
return S_OK;
}
STDAPI CStartCompositionEditSession::DoEditSession(TfEditCookie ec)
{
ITfInsertAtSelection* pInsertAtSelection = nullptr;
ITfRange* pRangeInsert = nullptr;
ITfContextComposition* pContextComposition = nullptr;
ITfComposition* pComposition = nullptr;
if (FAILED(_pContext->QueryInterface(IID_ITfInsertAtSelection, (void **)&pInsertAtSelection)))
{
goto Exit;
}
if (FAILED(pInsertAtSelection->InsertTextAtSelection(ec, TF_IAS_QUERYONLY, NULL, 0, &pRangeInsert)))
{
goto Exit;
}
if (FAILED(_pContext->QueryInterface(IID_ITfContextComposition, (void **)&pContextComposition)))
{
goto Exit;
}
if (SUCCEEDED(pContextComposition->StartComposition(ec, pRangeInsert, _pTextService, &pComposition)) && (nullptr != pComposition))
{
_pTextService->_SetComposition(pComposition);
// set selection to the adjusted range
TF_SELECTION tfSelection;
tfSelection.range = pRangeInsert;
tfSelection.style.ase = TF_AE_NONE;
tfSelection.style.fInterimChar = FALSE;
_pContext->SetSelection(ec, 1, &tfSelection);
_pTextService->_SaveCompositionContext(_pContext);
}
Exit:
if (nullptr != pContextComposition)
{
pContextComposition->Release();
}
if (nullptr != pRangeInsert)
{
pRangeInsert->Release();
}
if (nullptr != pInsertAtSelection)
{
pInsertAtSelection->Release();
}
return S_OK;
}
STDAPI CStartCompositionEditSession::DoEditSession(TfEditCookie ec)
{
HRESULT hr = E_FAIL;
ITfInsertAtSelection *pInsertAtSelection = NULL;
ITfRange *pRangeComposition = NULL;
if (_pContext->QueryInterface(IID_ITfInsertAtSelection, (LPVOID *) &pInsertAtSelection) != S_OK)
goto Exit;
if (pInsertAtSelection->InsertTextAtSelection(ec, TF_IAS_QUERYONLY, NULL, 0, &pRangeComposition) != S_OK)
goto Exit;
ITfContextComposition *pContextComposition = NULL;
ITfComposition *pComposition = NULL;
if (_pContext->QueryInterface(IID_ITfContextComposition, (LPVOID *) &pContextComposition) != S_OK)
goto Exit;
if ((pContextComposition->StartComposition(ec, pRangeComposition, _pTextService, &pComposition) == S_OK) && (pComposition != NULL))
{
_pTextService->_SetComposition(pComposition);
/* set selection */
/* WORKAROUND:
* CUAS does not provide a correct GetTextExt() position unless the composition is filled with characters.
* So we insert a dummy space character here.
* This is the same workaround used by Microsoft Pinyin IME (New Experience).
*/
if (_fCUASWorkaroundEnabled)
{
pRangeComposition->SetText(ec, TF_ST_CORRECTION, L" ", 1);
pRangeComposition->Collapse(ec, TF_ANCHOR_START);
}
TF_SELECTION tfSelection;
tfSelection.range = pRangeComposition;
tfSelection.style.ase = TF_AE_NONE;
tfSelection.style.fInterimChar = FALSE;
_pContext->SetSelection(ec, 1, &tfSelection);
}
Exit:
if (pContextComposition != NULL)
pContextComposition->Release();
if (pRangeComposition != NULL)
pRangeComposition->Release();
if (pInsertAtSelection != NULL)
pInsertAtSelection->Release();
return hr;
}
STDAPI CCompositionEditSession::DoEditSession(TfEditCookie ec)
{
ITfInsertAtSelection *pInsertAtSelection;
ITfContextComposition *pContextComposition;
ITfComposition *pComposition;
ITfRange *pRangeComposition;
ITfRange *pRangeInsert;
ITfContext *pCompositionContext;
HRESULT hr;
BOOL fEqualContexts;
// get an interface on the context we can use to deal with compositions
if (_pContext->QueryInterface(IID_ITfContextComposition, (void **)&pContextComposition) != S_OK)
return E_FAIL;
hr = E_FAIL;
pInsertAtSelection = NULL;
if (_pMark->_IsComposing())
{
// we have a composition, let's terminate it
// it's possible our current composition is in another context...let's find out
fEqualContexts = TRUE;
if (_pMark->_GetComposition()->GetRange(&pRangeComposition) == S_OK)
{
if (pRangeComposition->GetContext(&pCompositionContext) == S_OK)
{
fEqualContexts = IsEqualUnknown(pCompositionContext, _pContext);
if (!fEqualContexts)
{
// need an edit session in the composition context
_pMark->_TerminateCompositionInContext(pCompositionContext);
}
pCompositionContext->Release();
}
pRangeComposition->Release();
}
// if the composition is in pContext, we already have an edit cookie
if (fEqualContexts)
{
_pMark->_TerminateComposition(ec);
}
}
else
{
// let's start a new composition over the current selection
// this is totally contrived, a real text service would have
// some meaningful logic to trigger this
// first, test where a keystroke would go in the document if we did an insert
// we need a special interface to insert text at the selection
if (_pContext->QueryInterface(IID_ITfInsertAtSelection, (void **)&pInsertAtSelection) != S_OK)
{
pInsertAtSelection = NULL;
goto Exit;
}
if (pInsertAtSelection->InsertTextAtSelection(ec, TF_IAS_QUERYONLY, NULL, 0, &pRangeInsert) != S_OK)
goto Exit;
// start the composition
if (pContextComposition->StartComposition(ec, pRangeInsert, _pMark, &pComposition) != S_OK)
{
pComposition = NULL;
}
pRangeInsert->Release();
// _pComposition may be NULL even if StartComposition return S_OK, this mean the application
// rejected the composition
if (pComposition != NULL)
{
_pMark->_SetComposition(pComposition);
// underline the composition text to give the user some feedback UI
_pMark->_SetCompositionDisplayAttributes(ec);
}
}
// if we make it here, we've succeeded
hr = S_OK;
Exit:
SafeRelease(pInsertAtSelection);
pContextComposition->Release();
return hr;
}