gecko-dev/widget/windows/nsTextStore.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Ningjie Chen <chenn@email.uc.edu>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef NSTEXTSTORE_H_
#define NSTEXTSTORE_H_
#include "nsAutoPtr.h"
#include "nsString.h"
#include "nsCOMPtr.h"
#include "nsITimer.h"
#include "nsIWidget.h"
#include <msctf.h>
#include <textstor.h>
struct ITfThreadMgr;
struct ITfDocumentMgr;
struct ITfDisplayAttributeMgr;
struct ITfCategoryMgr;
class nsWindow;
class nsTextEvent;
// It doesn't work well when we notify TSF of text change
// during a mutation observer call because things get broken.
// So we post a message and notify TSF when we get it later.
#define WM_USER_TSF_TEXTCHANGE (WM_USER + 0x100)
/*
* Text Services Framework text store
*/
class nsTextStore : public ITextStoreACP,
public ITfContextOwnerCompositionSink
{
public: /*IUnknown*/
STDMETHODIMP_(ULONG) AddRef(void);
STDMETHODIMP QueryInterface(REFIID, void**);
STDMETHODIMP_(ULONG) Release(void);
public: /*ITextStoreACP*/
STDMETHODIMP AdviseSink(REFIID, IUnknown*, DWORD);
STDMETHODIMP UnadviseSink(IUnknown*);
STDMETHODIMP RequestLock(DWORD, HRESULT*);
STDMETHODIMP GetStatus(TS_STATUS*);
STDMETHODIMP QueryInsert(LONG, LONG, ULONG, LONG*, LONG*);
STDMETHODIMP GetSelection(ULONG, ULONG, TS_SELECTION_ACP*, ULONG*);
STDMETHODIMP SetSelection(ULONG, const TS_SELECTION_ACP*);
STDMETHODIMP GetText(LONG, LONG, WCHAR*, ULONG, ULONG*, TS_RUNINFO*, ULONG,
ULONG*, LONG*);
STDMETHODIMP SetText(DWORD, LONG, LONG, const WCHAR*, ULONG, TS_TEXTCHANGE*);
STDMETHODIMP GetFormattedText(LONG, LONG, IDataObject**);
STDMETHODIMP GetEmbedded(LONG, REFGUID, REFIID, IUnknown**);
STDMETHODIMP QueryInsertEmbedded(const GUID*, const FORMATETC*, BOOL*);
STDMETHODIMP InsertEmbedded(DWORD, LONG, LONG, IDataObject*, TS_TEXTCHANGE*);
STDMETHODIMP RequestSupportedAttrs(DWORD, ULONG, const TS_ATTRID*);
STDMETHODIMP RequestAttrsAtPosition(LONG, ULONG, const TS_ATTRID*, DWORD);
STDMETHODIMP RequestAttrsTransitioningAtPosition(LONG, ULONG,
const TS_ATTRID*, DWORD);
STDMETHODIMP FindNextAttrTransition(LONG, LONG, ULONG, const TS_ATTRID*,
DWORD, LONG*, BOOL*, LONG*);
STDMETHODIMP RetrieveRequestedAttrs(ULONG, TS_ATTRVAL*, ULONG*);
STDMETHODIMP GetEndACP(LONG*);
STDMETHODIMP GetActiveView(TsViewCookie*);
STDMETHODIMP GetACPFromPoint(TsViewCookie, const POINT*, DWORD, LONG*);
STDMETHODIMP GetTextExt(TsViewCookie, LONG, LONG, RECT*, BOOL*);
STDMETHODIMP GetScreenExt(TsViewCookie, RECT*);
STDMETHODIMP GetWnd(TsViewCookie, HWND*);
STDMETHODIMP InsertTextAtSelection(DWORD, const WCHAR*, ULONG, LONG*, LONG*,
TS_TEXTCHANGE*);
STDMETHODIMP InsertEmbeddedAtSelection(DWORD, IDataObject*, LONG*, LONG*,
TS_TEXTCHANGE*);
public: /*ITfContextOwnerCompositionSink*/
STDMETHODIMP OnStartComposition(ITfCompositionView*, BOOL*);
STDMETHODIMP OnUpdateComposition(ITfCompositionView*, ITfRange*);
STDMETHODIMP OnEndComposition(ITfCompositionView*);
protected:
typedef mozilla::widget::IMEState IMEState;
typedef mozilla::widget::InputContext InputContext;
public:
static void Initialize(void);
static void Terminate(void);
static void SetIMEOpenState(bool);
static bool GetIMEOpenState(void);
static void CommitComposition(bool aDiscard)
{
if (!sTsfTextStore) return;
sTsfTextStore->CommitCompositionInternal(aDiscard);
}
static void SetInputContext(const InputContext& aContext)
{
if (!sTsfTextStore) return;
sTsfTextStore->SetInputContextInternal(aContext.mIMEState.mEnabled);
}
static nsresult OnFocusChange(bool, nsWindow*, IMEState::Enabled);
static nsresult OnTextChange(PRUint32 aStart,
PRUint32 aOldEnd,
PRUint32 aNewEnd)
{
if (!sTsfTextStore) return NS_OK;
return sTsfTextStore->OnTextChangeInternal(aStart, aOldEnd, aNewEnd);
}
static void OnTextChangeMsg(void)
{
if (!sTsfTextStore) return;
// Notify TSF text change
// (see comments on WM_USER_TSF_TEXTCHANGE in nsTextStore.h)
sTsfTextStore->OnTextChangeMsgInternal();
}
static nsresult OnSelectionChange(void)
{
if (!sTsfTextStore) return NS_OK;
return sTsfTextStore->OnSelectionChangeInternal();
}
static void CompositionTimerCallbackFunc(nsITimer *aTimer, void *aClosure)
{
nsTextStore *ts = static_cast<nsTextStore*>(aClosure);
ts->OnCompositionTimer();
}
// Returns the address of the pointer so that the TSF automatic test can
// replace the system object with a custom implementation for testing.
static void* GetThreadMgr(void)
{
Initialize(); // Apply any previous changes
return (void*) & sTsfThreadMgr;
}
static void* GetCategoryMgr(void)
{
return (void*) & sCategoryMgr;
}
static void* GetDisplayAttrMgr(void)
{
return (void*) & sDisplayAttrMgr;
}
protected:
nsTextStore();
~nsTextStore();
bool Create(nsWindow*, IMEState::Enabled);
bool Destroy(void);
// If aDispatchTextEvent is true, this method will dispatch text event if
// this is called during IME composing. aDispatchTextEvent should be true
// only when this is called from SetSelection. Because otherwise, the text
// event should not be sent from here.
HRESULT SetSelectionInternal(const TS_SELECTION_ACP*,
bool aDispatchTextEvent = false);
HRESULT OnStartCompositionInternal(ITfCompositionView*, ITfRange*, bool);
void CommitCompositionInternal(bool);
void SetInputContextInternal(IMEState::Enabled aState);
nsresult OnTextChangeInternal(PRUint32, PRUint32, PRUint32);
void OnTextChangeMsgInternal(void);
nsresult OnSelectionChangeInternal(void);
HRESULT GetDisplayAttribute(ITfProperty* aProperty,
ITfRange* aRange,
TF_DISPLAYATTRIBUTE* aResult);
HRESULT UpdateCompositionExtent(ITfRange* pRangeNew);
HRESULT SendTextEventForCompositionString();
HRESULT SaveTextEvent(const nsTextEvent* aEvent);
nsresult OnCompositionTimer();
// Document manager for the currently focused editor
nsRefPtr<ITfDocumentMgr> mDocumentMgr;
// Edit cookie associated with the current editing context
DWORD mEditCookie;
// Editing context at the bottom of mDocumentMgr's context stack
nsRefPtr<ITfContext> mContext;
// Currently installed notification sink
nsRefPtr<ITextStoreACPSink> mSink;
// TS_AS_* mask of what events to notify
DWORD mSinkMask;
// Window containing the focused editor
nsWindow* mWindow;
// 0 if not locked, otherwise TS_LF_* indicating the current lock
DWORD mLock;
// 0 if no lock is queued, otherwise TS_LF_* indicating the queue lock
DWORD mLockQueued;
// Cumulative text change offsets since the last notification
TS_TEXTCHANGE mTextChange;
// NULL if no composition is active, otherwise the current composition
nsRefPtr<ITfCompositionView> mCompositionView;
// Current copy of the active composition string. Only mCompositionString is
// changed during a InsertTextAtSelection call if we have a composition.
// mCompositionString acts as a buffer until OnUpdateComposition is called
// and mCompositionString is flushed to editor through NS_TEXT_TEXT. This
// way all changes are updated in batches to avoid inconsistencies/artifacts.
nsString mCompositionString;
// "Current selection" during a composition, in ACP offsets.
// We use a fake selection during a composition because editor code doesn't
// like us accessing the actual selection during a composition. So we leave
// the actual selection alone and get/set mCompositionSelection instead
// during GetSelection/SetSelection calls.
TS_SELECTION_ACP mCompositionSelection;
// The start and length of the current active composition, in ACP offsets
LONG mCompositionStart;
LONG mCompositionLength;
// The latest text event which was dispatched for composition string
// of the current composing transaction.
nsTextEvent* mLastDispatchedTextEvent;
// The latest composition string which was dispatched by composition update
// event.
nsString mLastDispatchedCompositionString;
// Timer for calling ITextStoreACPSink::OnLayoutChange. This is only used
// during composing.
nsCOMPtr<nsITimer> mCompositionTimer;
// TSF thread manager object for the current application
static ITfThreadMgr* sTsfThreadMgr;
// TSF display attribute manager
static ITfDisplayAttributeMgr* sDisplayAttrMgr;
// TSF category manager
static ITfCategoryMgr* sCategoryMgr;
// TSF client ID for the current application
static DWORD sTsfClientId;
// Current text store. Currently only ONE nsTextStore instance is ever used,
// although Create is called when an editor is focused and Destroy called
// when the focused editor is blurred.
static nsTextStore* sTsfTextStore;
// Message the Tablet Input Panel uses to flush text during blurring.
// See comments in Destroy
static UINT sFlushTIPInputMessage;
private:
ULONG mRefCnt;
};
#endif /*NSTEXTSTORE_H_*/