gecko-dev/dom/html/TextInputListener.h

119 строки
3.2 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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_TextInputListener_h
#define mozilla_TextInputListener_h
#include "nsCycleCollectionParticipant.h"
#include "nsIDOMEventListener.h"
#include "nsStringFwd.h"
#include "nsWeakReference.h"
class nsIFrame;
class nsITextControlElement;
class nsTextControlFrame;
namespace mozilla {
namespace dom {
class Selection;
} // namespace dom
class TextInputListener final : public nsIDOMEventListener
, public nsSupportsWeakReference
{
public:
explicit TextInputListener(nsITextControlElement* aTextControlElement);
void SetFrame(nsIFrame* aTextControlFrame)
{
mFrame = aTextControlFrame;
}
void SettingValue(bool aValue)
{
mSettingValue = aValue;
}
void SetValueChanged(bool aSetValueChanged)
{
mSetValueChanged = aSetValueChanged;
}
/**
* aFrame is an optional pointer to our frame, if not passed the method will
* use mFrame to compute it lazily.
*/
void HandleValueChanged(nsTextControlFrame* aFrame = nullptr);
/**
* OnEditActionHandled() is called when the editor handles each edit action.
*/
void OnEditActionHandled();
/**
* OnSelectionChange() is called when selection is changed in the editor.
*/
void OnSelectionChange(Selection& aSelection, int16_t aReason);
/**
* Start to listen or end listening to selection change in the editor.
*/
void StartToListenToSelectionChange()
{
mListeningToSelectionChange = true;
}
void EndListeningToSelectionChange()
{
mListeningToSelectionChange = false;
}
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(TextInputListener,
nsIDOMEventListener)
NS_DECL_NSIDOMEVENTLISTENER
protected:
virtual ~TextInputListener() = default;
nsresult UpdateTextInputCommands(const nsAString& aCommandsToUpdate,
dom::Selection* aSelection = nullptr,
int16_t aReason = 0);
protected:
nsIFrame* mFrame;
nsITextControlElement* const mTxtCtrlElement;
bool mSelectionWasCollapsed;
/**
* Whether we had undo items or not the last time we got EditAction()
* notification (when this state changes we update undo and redo menus)
*/
bool mHadUndoItems;
/**
* Whether we had redo items or not the last time we got EditAction()
* notification (when this state changes we update undo and redo menus)
*/
bool mHadRedoItems;
/**
* Whether we're in the process of a SetValue call, and should therefore
* refrain from calling OnValueChanged.
*/
bool mSettingValue;
/**
* Whether we are in the process of a SetValue call that doesn't want
* |SetValueChanged| to be called.
*/
bool mSetValueChanged;
/**
* Whether we're listening to selection change in the editor.
*/
bool mListeningToSelectionChange;
};
} // namespace mozilla
#endif // #ifndef mozilla_TextInputListener_h