369 lines
14 KiB
C++
369 lines
14 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef mozilla_textcompositionsynthesizer_h_
|
|
#define mozilla_textcompositionsynthesizer_h_
|
|
|
|
#include "nsAutoPtr.h"
|
|
#include "nsString.h"
|
|
#include "mozilla/Attributes.h"
|
|
#include "mozilla/EventForwards.h"
|
|
#include "mozilla/TextEventDispatcherListener.h"
|
|
#include "mozilla/TextRange.h"
|
|
|
|
class nsIWidget;
|
|
|
|
namespace mozilla {
|
|
namespace widget {
|
|
|
|
struct IMENotification;
|
|
|
|
/**
|
|
* TextEventDispatcher is a helper class for dispatching widget events defined
|
|
* in TextEvents.h. Currently, this is a helper for dispatching
|
|
* WidgetCompositionEvent and WidgetKeyboardEvent. This manages the behavior
|
|
* of them for conforming to DOM Level 3 Events.
|
|
* An instance of this class is created by nsIWidget instance and owned by it.
|
|
* This is typically created only by the top level widgets because only they
|
|
* handle IME.
|
|
*/
|
|
|
|
class TextEventDispatcher final
|
|
{
|
|
~TextEventDispatcher()
|
|
{
|
|
}
|
|
|
|
NS_INLINE_DECL_REFCOUNTING(TextEventDispatcher)
|
|
|
|
public:
|
|
explicit TextEventDispatcher(nsIWidget* aWidget);
|
|
|
|
/**
|
|
* Initializes the instance for IME or automated test. Either IME or tests
|
|
* need to call one of them before starting composition. If they return
|
|
* NS_ERROR_ALREADY_INITIALIZED, it means that the listener already listens
|
|
* notifications from TextEventDispatcher for same purpose (for IME or tests).
|
|
* If this returns another error, the caller shouldn't keep starting
|
|
* composition.
|
|
*
|
|
* @param aListener Specify the listener to listen notifications and
|
|
* requests. This must not be null.
|
|
* NOTE: aListener is stored as weak reference in
|
|
* TextEventDispatcher. See mListener
|
|
* definition below.
|
|
*/
|
|
nsresult BeginInputTransaction(TextEventDispatcherListener* aListener);
|
|
nsresult BeginInputTransactionForTests(
|
|
TextEventDispatcherListener* aListener);
|
|
|
|
/**
|
|
* EndInputTransaction() should be called when the listener stops using
|
|
* the TextEventDispatcher.
|
|
*
|
|
* @param aListener The listener using the TextEventDispatcher instance.
|
|
*/
|
|
void EndInputTransaction(TextEventDispatcherListener* aListener);
|
|
|
|
/**
|
|
* OnDestroyWidget() is called when mWidget is being destroyed.
|
|
*/
|
|
void OnDestroyWidget();
|
|
|
|
/**
|
|
* GetState() returns current state of this class.
|
|
*
|
|
* @return NS_OK: Fine to compose text.
|
|
* NS_ERROR_NOT_INITIALIZED: BeginInputTransaction() or
|
|
* BeginInputTransactionForTests()
|
|
* should be called.
|
|
* NS_ERROR_NOT_AVAILABLE: The widget isn't available for
|
|
* composition.
|
|
*/
|
|
nsresult GetState() const;
|
|
|
|
/**
|
|
* IsComposing() returns true after calling StartComposition() and before
|
|
* calling CommitComposition().
|
|
*/
|
|
bool IsComposing() const { return mIsComposing; }
|
|
|
|
/**
|
|
* IsDispatchingEvent() returns true while this instance dispatching an event.
|
|
*/
|
|
bool IsDispatchingEvent() const { return mDispatchingEvent > 0; }
|
|
|
|
/**
|
|
* StartComposition() starts composition explicitly.
|
|
*/
|
|
nsresult StartComposition(nsEventStatus& aStatus);
|
|
|
|
/**
|
|
* CommitComposition() commits composition.
|
|
*
|
|
* @param aCommitString If this is null, commits with the last composition
|
|
* string. Otherwise, commits the composition with
|
|
* this value.
|
|
*/
|
|
nsresult CommitComposition(nsEventStatus& aStatus,
|
|
const nsAString* aCommitString = nullptr);
|
|
|
|
/**
|
|
* SetPendingCompositionString() sets new composition string which will be
|
|
* dispatched with eCompositionChange event by calling Flush().
|
|
*
|
|
* @param aString New composition string.
|
|
*/
|
|
nsresult SetPendingCompositionString(const nsAString& aString)
|
|
{
|
|
return mPendingComposition.SetString(aString);
|
|
}
|
|
|
|
/**
|
|
* AppendClauseToPendingComposition() appends a clause information to
|
|
* the pending composition string.
|
|
*
|
|
* @param aLength Length of the clause.
|
|
* @param aAttribute One of NS_TEXTRANGE_RAWINPUT,
|
|
* NS_TEXTRANGE_SELECTEDRAWTEXT,
|
|
* NS_TEXTRANGE_CONVERTEDTEXT or
|
|
* NS_TEXTRANGE_SELECTEDCONVERTEDTEXT.
|
|
*/
|
|
nsresult AppendClauseToPendingComposition(uint32_t aLength,
|
|
uint32_t aAttribute)
|
|
{
|
|
return mPendingComposition.AppendClause(aLength, aAttribute);
|
|
}
|
|
|
|
/**
|
|
* SetCaretInPendingComposition() sets caret position in the pending
|
|
* composition string and its length. This is optional. If IME doesn't
|
|
* want to show caret, it shouldn't need to call this.
|
|
*
|
|
* @param aOffset Offset of the caret in the pending composition
|
|
* string. This should not be larger than the length
|
|
* of the pending composition string.
|
|
* @param aLength Caret width. If this is 0, caret will be collapsed.
|
|
* Note that Gecko doesn't supported wide caret yet,
|
|
* therefore, this is ignored for now.
|
|
*/
|
|
nsresult SetCaretInPendingComposition(uint32_t aOffset,
|
|
uint32_t aLength)
|
|
{
|
|
return mPendingComposition.SetCaret(aOffset, aLength);
|
|
}
|
|
|
|
/**
|
|
* FlushPendingComposition() sends the pending composition string
|
|
* to the widget of the store DOM window. Before calling this, IME needs to
|
|
* set pending composition string with SetPendingCompositionString(),
|
|
* AppendClauseToPendingComposition() and/or
|
|
* SetCaretInPendingComposition().
|
|
*/
|
|
nsresult FlushPendingComposition(nsEventStatus& aStatus)
|
|
{
|
|
return mPendingComposition.Flush(this, aStatus);
|
|
}
|
|
|
|
/**
|
|
* ClearPendingComposition() makes this instance forget pending composition.
|
|
*/
|
|
void ClearPendingComposition()
|
|
{
|
|
mPendingComposition.Clear();
|
|
}
|
|
|
|
/**
|
|
* @see nsIWidget::NotifyIME()
|
|
*/
|
|
nsresult NotifyIME(const IMENotification& aIMENotification);
|
|
|
|
|
|
/**
|
|
* DispatchTo indicates whether the event may be dispatched to its parent
|
|
* process first (if there is) or not. If the event is dispatched to the
|
|
* parent process, APZ will handle it first. Otherwise, the event won't be
|
|
* handled by APZ if it's in a child process.
|
|
*/
|
|
enum DispatchTo
|
|
{
|
|
// The event may be dispatched to its parent process if there is a parent.
|
|
// In such case, the event will be handled asynchronously. Additionally,
|
|
// the event may be sent to its child process if a child process (including
|
|
// the dispatching process) has focus.
|
|
eDispatchToParentProcess = 0,
|
|
// The event must be dispatched in the current process. But of course,
|
|
// the event may be sent to a child process when it has focus. If there is
|
|
// no child process, the event may be handled synchronously.
|
|
eDispatchToCurrentProcess = 1
|
|
};
|
|
|
|
/**
|
|
* DispatchKeyboardEvent() maybe dispatches aKeyboardEvent.
|
|
*
|
|
* @param aMessage Must be eKeyDown or eKeyUp.
|
|
* Use MaybeDispatchKeypressEvents() for dispatching
|
|
* eKeyPress.
|
|
* @param aKeyboardEvent A keyboard event.
|
|
* @param aStatus If dispatching event should be marked as consumed,
|
|
* set nsEventStatus_eConsumeNoDefault. Otherwise,
|
|
* set nsEventStatus_eIgnore. After dispatching
|
|
* a event and it's consumed this returns
|
|
* nsEventStatus_eConsumeNoDefault.
|
|
* @param aDispatchTo See comments of DispatchTo.
|
|
* @return true if an event is dispatched. Otherwise, false.
|
|
*/
|
|
bool DispatchKeyboardEvent(EventMessage aMessage,
|
|
const WidgetKeyboardEvent& aKeyboardEvent,
|
|
nsEventStatus& aStatus,
|
|
DispatchTo aDispatchTo = eDispatchToParentProcess);
|
|
|
|
/**
|
|
* MaybeDispatchKeypressEvents() maybe dispatches a keypress event which is
|
|
* generated from aKeydownEvent.
|
|
*
|
|
* @param aKeyboardEvent A keyboard event.
|
|
* @param aStatus Sets the result when the caller dispatches
|
|
* aKeyboardEvent. Note that if the value is
|
|
* nsEventStatus_eConsumeNoDefault, this does NOT
|
|
* dispatch keypress events.
|
|
* When this method dispatches one or more keypress
|
|
* events and one of them is consumed, this returns
|
|
* nsEventStatus_eConsumeNoDefault.
|
|
* @param aDispatchTo See comments of DispatchTo.
|
|
* @return true if one or more events are dispatched.
|
|
* Otherwise, false.
|
|
*/
|
|
bool MaybeDispatchKeypressEvents(const WidgetKeyboardEvent& aKeyboardEvent,
|
|
nsEventStatus& aStatus,
|
|
DispatchTo aDispatchTo =
|
|
eDispatchToParentProcess);
|
|
|
|
private:
|
|
// mWidget is owner of the instance. When this is created, this is set.
|
|
// And when mWidget is released, this is cleared by OnDestroyWidget().
|
|
// Note that mWidget may be destroyed already (i.e., mWidget->Destroyed() may
|
|
// return true).
|
|
nsIWidget* mWidget;
|
|
// mListener is a weak reference to TextEventDispatcherListener. That might
|
|
// be referred by JS. Therefore, the listener might be difficult to release
|
|
// itself if this is a strong reference. Additionally, it's difficult to
|
|
// check if a method to uninstall the listener is called by valid instance.
|
|
// So, using weak reference is the best way in this case.
|
|
nsWeakPtr mListener;
|
|
|
|
// mPendingComposition stores new composition string temporarily.
|
|
// These values will be used for dispatching eCompositionChange event
|
|
// in Flush(). When Flush() is called, the members will be cleared
|
|
// automatically.
|
|
class PendingComposition
|
|
{
|
|
public:
|
|
PendingComposition();
|
|
nsresult SetString(const nsAString& aString);
|
|
nsresult AppendClause(uint32_t aLength, uint32_t aAttribute);
|
|
nsresult SetCaret(uint32_t aOffset, uint32_t aLength);
|
|
nsresult Flush(TextEventDispatcher* aDispatcher, nsEventStatus& aStatus);
|
|
void Clear();
|
|
|
|
private:
|
|
nsString mString;
|
|
RefPtr<TextRangeArray> mClauses;
|
|
TextRange mCaret;
|
|
|
|
void EnsureClauseArray();
|
|
};
|
|
PendingComposition mPendingComposition;
|
|
|
|
// While dispatching an event, this is incremented.
|
|
uint16_t mDispatchingEvent;
|
|
|
|
bool mForTests;
|
|
// See IsComposing().
|
|
bool mIsComposing;
|
|
|
|
// If this is true, keydown and keyup events are dispatched even when there
|
|
// is a composition.
|
|
static bool sDispatchKeyEventsDuringComposition;
|
|
|
|
nsresult BeginInputTransactionInternal(
|
|
TextEventDispatcherListener* aListener,
|
|
bool aForTests);
|
|
|
|
/**
|
|
* InitEvent() initializes aEvent. This must be called before dispatching
|
|
* the event.
|
|
*/
|
|
void InitEvent(WidgetGUIEvent& aEvent) const;
|
|
|
|
|
|
/**
|
|
* DispatchEvent() dispatches aEvent on aWidget.
|
|
*/
|
|
nsresult DispatchEvent(nsIWidget* aWidget,
|
|
WidgetGUIEvent& aEvent,
|
|
nsEventStatus& aStatus);
|
|
|
|
/**
|
|
* DispatchInputEvent() dispatches aEvent on aWidget.
|
|
*
|
|
* @param aDispatchTo See comments of DispatchTo.
|
|
*/
|
|
nsresult DispatchInputEvent(nsIWidget* aWidget,
|
|
WidgetInputEvent& aEvent,
|
|
nsEventStatus& aStatus,
|
|
DispatchTo aDispatchTo);
|
|
|
|
/**
|
|
* StartCompositionAutomaticallyIfNecessary() starts composition if it hasn't
|
|
* been started it yet.
|
|
*
|
|
* @param aStatus If it succeeded to start composition normally, this
|
|
* returns nsEventStatus_eIgnore. Otherwise, e.g.,
|
|
* the composition is canceled during dispatching
|
|
* compositionstart event, this returns
|
|
* nsEventStatus_eConsumeNoDefault. In this case,
|
|
* the caller shouldn't keep doing its job.
|
|
* @return Only when something unexpected occurs, this returns
|
|
* an error. Otherwise, returns NS_OK even if aStatus
|
|
* is nsEventStatus_eConsumeNoDefault.
|
|
*/
|
|
nsresult StartCompositionAutomaticallyIfNecessary(nsEventStatus& aStatus);
|
|
|
|
/**
|
|
* DispatchKeyboardEventInternal() maybe dispatches aKeyboardEvent.
|
|
*
|
|
* @param aMessage Must be eKeyDown, eKeyUp or eKeyPress.
|
|
* @param aKeyboardEvent A keyboard event. If aMessage is eKeyPress and
|
|
* the event is for second or later character, its
|
|
* mKeyValue should be empty string.
|
|
* @param aStatus If dispatching event should be marked as consumed,
|
|
* set nsEventStatus_eConsumeNoDefault. Otherwise,
|
|
* set nsEventStatus_eIgnore. After dispatching
|
|
* a event and it's consumed this returns
|
|
* nsEventStatus_eConsumeNoDefault.
|
|
* @param aDispatchTo See comments of DispatchTo.
|
|
* @param aIndexOfKeypress This must be 0 if aMessage isn't eKeyPress or
|
|
* aKeyboard.mKeyNameIndex isn't
|
|
* KEY_NAME_INDEX_USE_STRING. Otherwise, i.e.,
|
|
* when an eKeyPress event causes inputting
|
|
* text, this must be between 0 and
|
|
* mKeyValue.Length() - 1 since keypress events
|
|
* sending only one character per event.
|
|
* @return true if an event is dispatched. Otherwise, false.
|
|
*/
|
|
bool DispatchKeyboardEventInternal(EventMessage aMessage,
|
|
const WidgetKeyboardEvent& aKeyboardEvent,
|
|
nsEventStatus& aStatus,
|
|
DispatchTo aDispatchTo =
|
|
eDispatchToParentProcess,
|
|
uint32_t aIndexOfKeypress = 0);
|
|
};
|
|
|
|
} // namespace widget
|
|
} // namespace mozilla
|
|
|
|
#endif // #ifndef mozilla_widget_textcompositionsynthesizer_h_
|