487 lines
20 KiB
C++
487 lines
20 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_textcompositionsynthesizer_h_
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#define mozilla_textcompositionsynthesizer_h_
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#include "mozilla/RefPtr.h"
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#include "nsString.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/EventForwards.h"
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#include "mozilla/TextEventDispatcherListener.h"
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#include "mozilla/TextRange.h"
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class nsIWidget;
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namespace mozilla {
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namespace widget {
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struct IMENotification;
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/**
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* TextEventDispatcher is a helper class for dispatching widget events defined
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* in TextEvents.h. Currently, this is a helper for dispatching
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* WidgetCompositionEvent and WidgetKeyboardEvent. This manages the behavior
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* of them for conforming to DOM Level 3 Events.
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* An instance of this class is created by nsIWidget instance and owned by it.
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* This is typically created only by the top level widgets because only they
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* handle IME.
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*/
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class TextEventDispatcher final
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{
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~TextEventDispatcher()
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{
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}
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NS_INLINE_DECL_REFCOUNTING(TextEventDispatcher)
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public:
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explicit TextEventDispatcher(nsIWidget* aWidget);
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/**
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* Initializes the instance for IME or automated test. Either IME or tests
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* need to call one of them before starting composition. If they return
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* NS_ERROR_ALREADY_INITIALIZED, it means that the listener already listens
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* notifications from TextEventDispatcher for same purpose (for IME or tests).
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* If this returns another error, the caller shouldn't keep starting
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* composition.
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*
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* @param aListener Specify the listener to listen notifications and
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* requests. This must not be null.
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* NOTE: aListener is stored as weak reference in
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* TextEventDispatcher. See mListener
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* definition below.
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*/
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nsresult BeginInputTransaction(TextEventDispatcherListener* aListener);
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nsresult BeginTestInputTransaction(TextEventDispatcherListener* aListener,
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bool aIsAPZAware);
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nsresult BeginNativeInputTransaction();
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/**
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* EndInputTransaction() should be called when the listener stops using
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* the TextEventDispatcher.
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*
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* @param aListener The listener using the TextEventDispatcher instance.
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*/
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void EndInputTransaction(TextEventDispatcherListener* aListener);
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/**
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* OnDestroyWidget() is called when mWidget is being destroyed.
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*/
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void OnDestroyWidget();
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nsIWidget* GetWidget() const { return mWidget; }
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/**
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* GetState() returns current state of this class.
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*
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* @return NS_OK: Fine to compose text.
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* NS_ERROR_NOT_INITIALIZED: BeginInputTransaction() or
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* BeginInputTransactionForTests()
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* should be called.
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* NS_ERROR_NOT_AVAILABLE: The widget isn't available for
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* composition.
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*/
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nsresult GetState() const;
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/**
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* IsComposing() returns true after calling StartComposition() and before
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* calling CommitComposition().
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*/
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bool IsComposing() const { return mIsComposing; }
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/**
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* IsInNativeInputTransaction() returns true if native IME handler began a
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* transaction and it's not finished yet.
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*/
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bool IsInNativeInputTransaction() const
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{
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return mInputTransactionType == eNativeInputTransaction;
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}
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/**
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* IsDispatchingEvent() returns true while this instance dispatching an event.
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*/
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bool IsDispatchingEvent() const { return mDispatchingEvent > 0; }
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/**
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* GetPseudoIMEContext() returns pseudo native IME context if there is an
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* input transaction whose type is not for native event handler.
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* Otherwise, returns nullptr.
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*/
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void* GetPseudoIMEContext() const
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{
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if (mInputTransactionType == eNoInputTransaction ||
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mInputTransactionType == eNativeInputTransaction) {
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return nullptr;
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}
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return const_cast<TextEventDispatcher*>(this);
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}
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/**
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* StartComposition() starts composition explicitly.
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*
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* @param aEventTime If this is not nullptr, WidgetCompositionEvent will
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* be initialized with this. Otherwise, initialized
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* with the time at initializing.
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*/
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nsresult StartComposition(nsEventStatus& aStatus,
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const WidgetEventTime* aEventTime = nullptr);
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/**
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* CommitComposition() commits composition.
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*
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* @param aCommitString If this is null, commits with the last composition
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* string. Otherwise, commits the composition with
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* this value.
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* @param aEventTime If this is not nullptr, WidgetCompositionEvent will
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* be initialized with this. Otherwise, initialized
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* with the time at initializing.
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*/
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nsresult CommitComposition(nsEventStatus& aStatus,
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const nsAString* aCommitString = nullptr,
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const WidgetEventTime* aEventTime = nullptr);
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/**
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* SetPendingCompositionString() sets new composition string which will be
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* dispatched with eCompositionChange event by calling Flush().
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*
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* @param aString New composition string.
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*/
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nsresult SetPendingCompositionString(const nsAString& aString)
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{
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return mPendingComposition.SetString(aString);
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}
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/**
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* AppendClauseToPendingComposition() appends a clause information to
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* the pending composition string.
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*
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* @param aLength Length of the clause.
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* @param aTextRangeType One of TextRangeType::eRawClause,
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* TextRangeType::eSelectedRawClause,
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* TextRangeType::eConvertedClause or
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* TextRangeType::eSelectedClause.
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*/
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nsresult AppendClauseToPendingComposition(uint32_t aLength,
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TextRangeType aTextRangeType)
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{
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return mPendingComposition.AppendClause(aLength, aTextRangeType);
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}
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/**
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* SetCaretInPendingComposition() sets caret position in the pending
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* composition string and its length. This is optional. If IME doesn't
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* want to show caret, it shouldn't need to call this.
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*
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* @param aOffset Offset of the caret in the pending composition
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* string. This should not be larger than the length
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* of the pending composition string.
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* @param aLength Caret width. If this is 0, caret will be collapsed.
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* Note that Gecko doesn't supported wide caret yet,
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* therefore, this is ignored for now.
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*/
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nsresult SetCaretInPendingComposition(uint32_t aOffset,
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uint32_t aLength)
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{
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return mPendingComposition.SetCaret(aOffset, aLength);
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}
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/**
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* SetPendingComposition() is useful if native IME handler already creates
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* array of clauses and/or caret information.
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*
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* @param aString Composition string. This may include native line
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* breakers since they will be replaced with XP line
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* breakers automatically.
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* @param aRanges This should include the ranges of clauses and/or
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* a range of caret. Note that this method allows
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* some ranges overlap each other and the range order
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* is not from start to end.
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*/
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nsresult SetPendingComposition(const nsAString& aString,
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const TextRangeArray* aRanges)
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{
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return mPendingComposition.Set(aString, aRanges);
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}
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/**
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* FlushPendingComposition() sends the pending composition string
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* to the widget of the store DOM window. Before calling this, IME needs to
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* set pending composition string with SetPendingCompositionString(),
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* AppendClauseToPendingComposition() and/or
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* SetCaretInPendingComposition().
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*
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* @param aEventTime If this is not nullptr, WidgetCompositionEvent will
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* be initialized with this. Otherwise, initialized
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* with the time at initializing.
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*/
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nsresult FlushPendingComposition(nsEventStatus& aStatus,
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const WidgetEventTime* aEventTime = nullptr)
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{
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return mPendingComposition.Flush(this, aStatus, aEventTime);
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}
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/**
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* ClearPendingComposition() makes this instance forget pending composition.
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*/
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void ClearPendingComposition()
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{
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mPendingComposition.Clear();
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}
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/**
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* GetPendingCompositionClauses() returns text ranges which was appended by
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* AppendClauseToPendingComposition() or SetPendingComposition().
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*/
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const TextRangeArray* GetPendingCompositionClauses() const
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{
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return mPendingComposition.GetClauses();
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}
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/**
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* @see nsIWidget::NotifyIME()
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*/
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nsresult NotifyIME(const IMENotification& aIMENotification);
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/**
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* DispatchKeyboardEvent() maybe dispatches aKeyboardEvent.
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*
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* @param aMessage Must be eKeyDown or eKeyUp.
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* Use MaybeDispatchKeypressEvents() for dispatching
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* eKeyPress.
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* @param aKeyboardEvent A keyboard event.
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* @param aStatus If dispatching event should be marked as consumed,
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* set nsEventStatus_eConsumeNoDefault. Otherwise,
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* set nsEventStatus_eIgnore. After dispatching
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* a event and it's consumed this returns
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* nsEventStatus_eConsumeNoDefault.
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* @param aData Calling this method may cause calling
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* WillDispatchKeyboardEvent() of the listener.
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* aData will be set to its argument.
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* @return true if an event is dispatched. Otherwise, false.
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*/
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bool DispatchKeyboardEvent(EventMessage aMessage,
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const WidgetKeyboardEvent& aKeyboardEvent,
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nsEventStatus& aStatus,
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void* aData = nullptr);
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/**
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* MaybeDispatchKeypressEvents() maybe dispatches a keypress event which is
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* generated from aKeydownEvent.
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*
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* @param aKeyboardEvent A keyboard event.
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* @param aStatus Sets the result when the caller dispatches
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* aKeyboardEvent. Note that if the value is
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* nsEventStatus_eConsumeNoDefault, this does NOT
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* dispatch keypress events.
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* When this method dispatches one or more keypress
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* events and one of them is consumed, this returns
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* nsEventStatus_eConsumeNoDefault.
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* @param aData Calling this method may cause calling
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* WillDispatchKeyboardEvent() of the listener.
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* aData will be set to its argument.
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* @param aNeedsCallback Set true when caller needs to initialize each
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* eKeyPress event immediately before dispatch.
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* Then, WillDispatchKeyboardEvent() is always called.
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* @return true if one or more events are dispatched.
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* Otherwise, false.
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*/
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bool MaybeDispatchKeypressEvents(const WidgetKeyboardEvent& aKeyboardEvent,
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nsEventStatus& aStatus,
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void* aData = nullptr,
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bool aNeedsCallback = false);
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private:
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// mWidget is owner of the instance. When this is created, this is set.
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// And when mWidget is released, this is cleared by OnDestroyWidget().
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// Note that mWidget may be destroyed already (i.e., mWidget->Destroyed() may
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// return true).
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nsIWidget* mWidget;
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// mListener is a weak reference to TextEventDispatcherListener. That might
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// be referred by JS. Therefore, the listener might be difficult to release
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// itself if this is a strong reference. Additionally, it's difficult to
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// check if a method to uninstall the listener is called by valid instance.
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// So, using weak reference is the best way in this case.
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nsWeakPtr mListener;
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// mPendingComposition stores new composition string temporarily.
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// These values will be used for dispatching eCompositionChange event
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// in Flush(). When Flush() is called, the members will be cleared
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// automatically.
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class PendingComposition
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{
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public:
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PendingComposition();
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nsresult SetString(const nsAString& aString);
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nsresult AppendClause(uint32_t aLength, TextRangeType aTextRangeType);
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nsresult SetCaret(uint32_t aOffset, uint32_t aLength);
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nsresult Set(const nsAString& aString, const TextRangeArray* aRanges);
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nsresult Flush(TextEventDispatcher* aDispatcher,
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nsEventStatus& aStatus,
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const WidgetEventTime* aEventTime);
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const TextRangeArray* GetClauses() const { return mClauses; }
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void Clear();
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private:
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nsString mString;
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RefPtr<TextRangeArray> mClauses;
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TextRange mCaret;
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void EnsureClauseArray();
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};
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PendingComposition mPendingComposition;
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// While dispatching an event, this is incremented.
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uint16_t mDispatchingEvent;
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enum InputTransactionType : uint8_t
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{
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// No input transaction has been started.
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eNoInputTransaction,
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// Input transaction for native IME or keyboard event handler. Note that
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// keyboard events may be dispatched via parent process if there is.
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eNativeInputTransaction,
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// Input transaction for automated tests which are APZ-aware. Note that
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// keyboard events may be dispatched via parent process if there is.
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eAsyncTestInputTransaction,
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// Input transaction for automated tests which assume events are fired
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// synchronously. I.e., keyboard events are always dispatched in the
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// current process.
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eSameProcessSyncTestInputTransaction,
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// Input transaction for Others (must be IME on B2G). Events are fired
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// synchronously because TextInputProcessor which is the only user of
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// this input transaction type supports only keyboard apps on B2G.
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// Keyboard apps on B2G doesn't want to dispatch keyboard events to
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// chrome process. Therefore, this should dispatch key events only in
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// the current process.
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eSameProcessSyncInputTransaction
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};
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InputTransactionType mInputTransactionType;
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bool IsForTests() const
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{
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return mInputTransactionType == eAsyncTestInputTransaction ||
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mInputTransactionType == eSameProcessSyncTestInputTransaction;
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}
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// ShouldSendInputEventToAPZ() returns true when WidgetInputEvent should
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// be dispatched via its parent process (if there is) for APZ. Otherwise,
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// when the input transaction is for IME of B2G or automated tests which
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// isn't APZ-aware, WidgetInputEvent should be dispatched form current
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// process directly.
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bool ShouldSendInputEventToAPZ() const
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{
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switch (mInputTransactionType) {
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case eNativeInputTransaction:
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case eAsyncTestInputTransaction:
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return true;
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case eSameProcessSyncTestInputTransaction:
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case eSameProcessSyncInputTransaction:
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return false;
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case eNoInputTransaction:
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NS_WARNING("Why does the caller need to dispatch an event when "
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"there is no input transaction?");
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return true;
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default:
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MOZ_CRASH("Define the behavior of new InputTransactionType");
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}
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}
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// See IsComposing().
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bool mIsComposing;
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// If this is true, keydown and keyup events are dispatched even when there
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// is a composition.
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static bool sDispatchKeyEventsDuringComposition;
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nsresult BeginInputTransactionInternal(
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TextEventDispatcherListener* aListener,
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InputTransactionType aType);
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/**
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* InitEvent() initializes aEvent. This must be called before dispatching
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* the event.
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*/
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void InitEvent(WidgetGUIEvent& aEvent) const;
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/**
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* DispatchEvent() dispatches aEvent on aWidget.
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*/
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nsresult DispatchEvent(nsIWidget* aWidget,
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WidgetGUIEvent& aEvent,
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nsEventStatus& aStatus);
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/**
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* DispatchInputEvent() dispatches aEvent on aWidget.
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*/
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nsresult DispatchInputEvent(nsIWidget* aWidget,
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WidgetInputEvent& aEvent,
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nsEventStatus& aStatus);
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/**
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* StartCompositionAutomaticallyIfNecessary() starts composition if it hasn't
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* been started it yet.
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*
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* @param aStatus If it succeeded to start composition normally, this
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* returns nsEventStatus_eIgnore. Otherwise, e.g.,
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* the composition is canceled during dispatching
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* compositionstart event, this returns
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* nsEventStatus_eConsumeNoDefault. In this case,
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* the caller shouldn't keep doing its job.
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* @param aEventTime If this is not nullptr, WidgetCompositionEvent will
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* be initialized with this. Otherwise, initialized
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* with the time at initializing.
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* @return Only when something unexpected occurs, this returns
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* an error. Otherwise, returns NS_OK even if aStatus
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* is nsEventStatus_eConsumeNoDefault.
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*/
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nsresult StartCompositionAutomaticallyIfNecessary(
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nsEventStatus& aStatus,
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const WidgetEventTime* aEventTime);
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/**
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* DispatchKeyboardEventInternal() maybe dispatches aKeyboardEvent.
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*
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* @param aMessage Must be eKeyDown, eKeyUp or eKeyPress.
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* @param aKeyboardEvent A keyboard event. If aMessage is eKeyPress and
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* the event is for second or later character, its
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* mKeyValue should be empty string.
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* @param aStatus If dispatching event should be marked as consumed,
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* set nsEventStatus_eConsumeNoDefault. Otherwise,
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* set nsEventStatus_eIgnore. After dispatching
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* a event and it's consumed this returns
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* nsEventStatus_eConsumeNoDefault.
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* @param aData Calling this method may cause calling
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* WillDispatchKeyboardEvent() of the listener.
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* aData will be set to its argument.
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* @param aIndexOfKeypress This must be 0 if aMessage isn't eKeyPress or
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* aKeyboard.mKeyNameIndex isn't
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* KEY_NAME_INDEX_USE_STRING. Otherwise, i.e.,
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* when an eKeyPress event causes inputting
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* text, this must be between 0 and
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* mKeyValue.Length() - 1 since keypress events
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* sending only one character per event.
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* @param aNeedsCallback Set true when caller needs to initialize each
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* eKeyPress event immediately before dispatch.
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* Then, WillDispatchKeyboardEvent() is always called.
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* @return true if an event is dispatched. Otherwise, false.
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*/
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bool DispatchKeyboardEventInternal(EventMessage aMessage,
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const WidgetKeyboardEvent& aKeyboardEvent,
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nsEventStatus& aStatus,
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void* aData,
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uint32_t aIndexOfKeypress = 0,
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bool aNeedsCallback = false);
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};
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} // namespace widget
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} // namespace mozilla
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#endif // #ifndef mozilla_widget_textcompositionsynthesizer_h_
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