First commit.

StartComposition.cpp

@@ -0,0 +1,133 @@
+// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
+// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
+// PARTICULAR PURPOSE.
+//
+// Copyright (c) Microsoft Corporation. All rights reserved
+
+#include "Private.h"
+#include "Globals.h"
+#include "EditSession.h"
+#include "SampleIME.h"
+
+//+---------------------------------------------------------------------------
+//
+// CStartCompositinoEditSession
+//
+//----------------------------------------------------------------------------
+
+class CStartCompositionEditSession : public CEditSessionBase
+{
+public:
+    CStartCompositionEditSession(_In_ CSampleIME *pTextService, _In_ ITfContext *pContext) : CEditSessionBase(pTextService, pContext)
+    {
+    }
+
+    // ITfEditSession
+    STDMETHODIMP DoEditSession(TfEditCookie ec);
+};
+
+//+---------------------------------------------------------------------------
+//
+// ITfEditSession::DoEditSession
+//
+//----------------------------------------------------------------------------
+
+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;
+}
+
+//////////////////////////////////////////////////////////////////////
+//
+// CSampleIME class
+//
+//////////////////////////////////////////////////////////////////////
+
+//+---------------------------------------------------------------------------
+//
+// _StartComposition
+//
+// this starts the new (std::nothrow) composition at the selection of the current 
+// focus context.
+//----------------------------------------------------------------------------
+
+void CSampleIME::_StartComposition(_In_ ITfContext *pContext)
+{
+    CStartCompositionEditSession* pStartCompositionEditSession = new (std::nothrow) CStartCompositionEditSession(this, pContext);
+
+    if (nullptr != pStartCompositionEditSession)
+    {
+        HRESULT hr = S_OK;
+        pContext->RequestEditSession(_tfClientId, pStartCompositionEditSession, TF_ES_SYNC | TF_ES_READWRITE, &hr);
+
+        pStartCompositionEditSession->Release();
+    }
+}
+
+//+---------------------------------------------------------------------------
+//
+// _SaveCompositionContext
+//
+// this saves the context _pComposition belongs to; we need this to clear
+// text attribute in case composition has not been terminated on 
+// deactivation
+//----------------------------------------------------------------------------
+
+void CSampleIME::_SaveCompositionContext(_In_ ITfContext *pContext)
+{
+    assert(_pContext == nullptr);
+
+    pContext->AddRef();
+    _pContext = pContext;
+}