зеркало из https://github.com/mozilla/gecko-dev.git
133 строки
3.3 KiB
C++
133 строки
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; 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_a11y_SelectionManager_h__
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#define mozilla_a11y_SelectionManager_h__
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#include "nsIFrame.h"
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#include "nsISelectionListener.h"
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class nsIPresShell;
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namespace mozilla {
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namespace dom {
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class Element;
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}
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namespace a11y {
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class AccEvent;
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class HyperTextAccessible;
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/**
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* This special accessibility class is for the caret and selection management.
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* There is only 1 visible caret per top level window. However, there may be
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* several visible selections.
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*
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* The important selections are the one owned by each document, and the one in
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* the currently focused control.
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*
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* On Windows this class is used to move an invisible system caret that
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* shadows the Mozilla caret. Windows will also automatically map this to
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* the MSAA caret accessible object (via OBJID_CARET) (as opposed to the root
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* accessible tree for a window which is retrieved with OBJID_CLIENT).
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*
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* For ATK and IAccessible2, this class is used to fire caret move and
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* selection change events.
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*/
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struct SelData;
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class SelectionManager : public nsISelectionListener
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{
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public:
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// nsISupports
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// implemented by derived nsAccessibilityService
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// nsISelectionListener
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NS_DECL_NSISELECTIONLISTENER
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// SelectionManager
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void Shutdown() { ClearControlSelectionListener(); }
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/**
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* Listen to selection events on the focused control.
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*
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* Note: only one control's selection events are listened to at a time. This
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* will remove the previous control's selection listener.
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*/
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void SetControlSelectionListener(dom::Element* aFocusedElm);
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/**
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* Stop listening to selection events on the control.
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*/
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void ClearControlSelectionListener();
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/**
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* Listen to selection events on the document.
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*/
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void AddDocSelectionListener(nsIPresShell* aPresShell);
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/**
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* Stop listening to selection events for a given document
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*/
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void RemoveDocSelectionListener(nsIPresShell* aShell);
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/**
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* Process delayed event, results in caret move and text selection change
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* events.
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*/
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void ProcessTextSelChangeEvent(AccEvent* aEvent);
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/**
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* Gets the current caret offset/hypertext accessible pair. If there is no
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* current pair, then returns -1 for the offset and a nullptr for the
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* accessible.
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*/
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inline HyperTextAccessible* AccessibleWithCaret(int32_t* aCaret)
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{
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if (aCaret)
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*aCaret = mCaretOffset;
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return mAccWithCaret;
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}
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/**
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* Update caret offset when it doesn't go through a caret move event.
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*/
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inline void UpdateCaretOffset(HyperTextAccessible* aItem, int32_t aOffset)
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{
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mAccWithCaret = aItem;
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mCaretOffset = aOffset;
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}
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inline void ResetCaretOffset()
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{
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mCaretOffset = -1;
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mAccWithCaret = nullptr;
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}
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protected:
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SelectionManager();
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/**
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* Process DOM selection change. Fire selection and caret move events.
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*/
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void ProcessSelectionChanged(SelData* aSelData);
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private:
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// Currently focused control.
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nsWeakFrame mCurrCtrlFrame;
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int32_t mCaretOffset;
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HyperTextAccessible* mAccWithCaret;
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};
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} // namespace a11y
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} // namespace mozilla
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#endif
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