mirror of
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251 lines
8.2 KiB
C++
251 lines
8.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=2 et :
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Boris Zbarsky <bzbarsky@mit.edu> (Original Author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef mozilla_dom_Element_h__
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#define mozilla_dom_Element_h__
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#include "nsIContent.h"
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#include "nsEventStates.h"
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#include "nsDOMMemoryReporter.h"
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class nsEventStateManager;
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class nsGlobalWindow;
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class nsFocusManager;
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// Element-specific flags
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enum {
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// Set if the element has a pending style change.
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ELEMENT_HAS_PENDING_RESTYLE = (1 << NODE_TYPE_SPECIFIC_BITS_OFFSET),
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// Set if the element is a potential restyle root (that is, has a style
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// change pending _and_ that style change will attempt to restyle
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// descendants).
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ELEMENT_IS_POTENTIAL_RESTYLE_ROOT =
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(1 << (NODE_TYPE_SPECIFIC_BITS_OFFSET + 1)),
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// Set if the element has a pending animation style change.
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ELEMENT_HAS_PENDING_ANIMATION_RESTYLE =
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(1 << (NODE_TYPE_SPECIFIC_BITS_OFFSET + 2)),
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// Set if the element is a potential animation restyle root (that is,
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// has an animation style change pending _and_ that style change
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// will attempt to restyle descendants).
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ELEMENT_IS_POTENTIAL_ANIMATION_RESTYLE_ROOT =
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(1 << (NODE_TYPE_SPECIFIC_BITS_OFFSET + 3)),
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// All of those bits together, for convenience.
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ELEMENT_ALL_RESTYLE_FLAGS = ELEMENT_HAS_PENDING_RESTYLE |
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ELEMENT_IS_POTENTIAL_RESTYLE_ROOT |
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ELEMENT_HAS_PENDING_ANIMATION_RESTYLE |
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ELEMENT_IS_POTENTIAL_ANIMATION_RESTYLE_ROOT,
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// Just the HAS_PENDING bits, for convenience
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ELEMENT_PENDING_RESTYLE_FLAGS = ELEMENT_HAS_PENDING_RESTYLE |
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ELEMENT_HAS_PENDING_ANIMATION_RESTYLE,
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// Remaining bits are for subclasses
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ELEMENT_TYPE_SPECIFIC_BITS_OFFSET = NODE_TYPE_SPECIFIC_BITS_OFFSET + 4
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};
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namespace mozilla {
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namespace dom {
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class Link;
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// IID for the dom::Element interface
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#define NS_ELEMENT_IID \
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{ 0xa1588efb, 0x5a84, 0x49cd, \
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{ 0x99, 0x1a, 0xac, 0x84, 0x9d, 0x92, 0x05, 0x0f } }
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class Element : public nsIContent
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{
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public:
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#ifdef MOZILLA_INTERNAL_API
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Element(already_AddRefed<nsINodeInfo> aNodeInfo) :
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nsIContent(aNodeInfo),
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mState(NS_EVENT_STATE_MOZ_READONLY)
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{}
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#endif // MOZILLA_INTERNAL_API
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_ELEMENT_IID)
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/**
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* Method to get the full state of this element. See nsEventStates.h for
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* the possible bits that could be set here.
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*/
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nsEventStates State() const {
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// mState is maintained by having whoever might have changed it
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// call UpdateState() or one of the other mState mutators.
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return mState;
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}
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/**
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* Ask this element to update its state. If aNotify is false, then
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* state change notifications will not be dispatched; in that
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* situation it is the caller's responsibility to dispatch them.
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*
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* In general, aNotify should only be false if we're guaranteed that
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* the element can't have a frame no matter what its style is
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* (e.g. if we're in the middle of adding it to the document or
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* removing it from the document).
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*/
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void UpdateState(bool aNotify);
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/**
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* Method to update mState with link state information. This does not notify.
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*/
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void UpdateLinkState(nsEventStates aState);
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/**
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* Returns true if this element is either a full-screen element or an
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* ancestor of the full-screen element.
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*/
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bool IsFullScreenAncestor() const {
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return mState.HasAtLeastOneOfStates(NS_EVENT_STATE_FULL_SCREEN_ANCESTOR |
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NS_EVENT_STATE_FULL_SCREEN);
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}
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/**
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* The style state of this element. This is the real state of the element
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* with any style locks applied for pseudo-class inspecting.
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*/
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nsEventStates StyleState() const {
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if (!HasLockedStyleStates()) {
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return mState;
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}
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return StyleStateFromLocks();
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};
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/**
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* The style state locks applied to this element.
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*/
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nsEventStates LockedStyleStates() const;
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/**
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* Add a style state lock on this element.
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*/
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void LockStyleStates(nsEventStates aStates);
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/**
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* Remove a style state lock on this element.
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*/
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void UnlockStyleStates(nsEventStates aStates);
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/**
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* Clear all style state locks on this element.
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*/
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void ClearStyleStateLocks();
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protected:
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/**
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* Method to get the _intrinsic_ content state of this element. This is the
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* state that is independent of the element's presentation. To get the full
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* content state, use State(). See nsEventStates.h for
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* the possible bits that could be set here.
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*/
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virtual nsEventStates IntrinsicState() const;
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/**
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* Method to add state bits. This should be called from subclass
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* constructors to set up our event state correctly at construction
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* time and other places where we don't want to notify a state
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* change.
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*/
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void AddStatesSilently(nsEventStates aStates) {
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mState |= aStates;
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}
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/**
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* Method to remove state bits. This should be called from subclass
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* constructors to set up our event state correctly at construction
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* time and other places where we don't want to notify a state
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* change.
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*/
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void RemoveStatesSilently(nsEventStates aStates) {
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mState &= ~aStates;
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}
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private:
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// Need to allow the ESM, nsGlobalWindow, and the focus manager to
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// set our state
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friend class ::nsEventStateManager;
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friend class ::nsGlobalWindow;
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friend class ::nsFocusManager;
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// Also need to allow Link to call UpdateLinkState.
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friend class Link;
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void NotifyStateChange(nsEventStates aStates);
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void NotifyStyleStateChange(nsEventStates aStates);
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// Style state computed from element's state and style locks.
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nsEventStates StyleStateFromLocks() const;
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// Methods for the ESM to manage state bits. These will handle
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// setting up script blockers when they notify, so no need to do it
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// in the callers unless desired.
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void AddStates(nsEventStates aStates) {
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NS_PRECONDITION(!aStates.HasAtLeastOneOfStates(INTRINSIC_STATES),
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"Should only be adding ESM-managed states here");
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AddStatesSilently(aStates);
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NotifyStateChange(aStates);
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}
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void RemoveStates(nsEventStates aStates) {
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NS_PRECONDITION(!aStates.HasAtLeastOneOfStates(INTRINSIC_STATES),
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"Should only be removing ESM-managed states here");
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RemoveStatesSilently(aStates);
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NotifyStateChange(aStates);
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}
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nsEventStates mState;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(Element, NS_ELEMENT_IID)
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} // namespace dom
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} // namespace mozilla
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inline mozilla::dom::Element* nsINode::AsElement() {
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NS_ASSERTION(IsElement(), "Not an element?");
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return static_cast<mozilla::dom::Element*>(this);
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}
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#endif // mozilla_dom_Element_h__
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