void TextService::setCompositionString(EditSession* session, const wchar_t* str, int len) {
ITfContext* context = session->context();
if(context) {
TfEditCookie editCookie = session->editCookie();
TF_SELECTION selection;
ULONG selectionNum;
// get current selection/insertion point
if(context->GetSelection(editCookie, TF_DEFAULT_SELECTION, 1, &selection, &selectionNum) == S_OK) {
ComPtr<ITfRange> compositionRange;
if(composition_->GetRange(&compositionRange) == S_OK) {
bool selPosInComposition = true;
// if current insertion point is not covered by composition, we cannot insert text here.
if(selPosInComposition) {
// replace context of composion area with the new string.
compositionRange->SetText(editCookie, TF_ST_CORRECTION, str, len);
// move the insertion point to end of the composition string
selection.range->Collapse(editCookie, TF_ANCHOR_END);
context->SetSelection(editCookie, 1, &selection);
}
// set display attribute to the composition range
ComPtr<ITfProperty> dispAttrProp;
if(context->GetProperty(GUID_PROP_ATTRIBUTE, &dispAttrProp) == S_OK) {
VARIANT val;
val.vt = VT_I4;
val.lVal = module_->inputAttrib()->atom();
dispAttrProp->SetValue(editCookie, compositionRange, &val);
}
}
selection.range->Release();
}
}
}
// 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;
}