gecko/layout/style/nsTransitionManager.h

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4.9 KiB
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/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is nsTransitionManager.
*
* The Initial Developer of the Original Code is the Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* Code to start and animate CSS transitions. */
#ifndef nsTransitionManager_h_
#define nsTransitionManager_h_
#include "prclist.h"
#include "nsCSSProperty.h"
#include "nsIStyleRuleProcessor.h"
#include "nsRefreshDriver.h"
class nsStyleContext;
class nsPresContext;
class nsCSSPropertySet;
struct nsTransition;
struct ElementTransitions;
/**
* Must be created only as a sub-object of an nsPresContext (since its
* reference counting methods assume that).
*/
class nsTransitionManager : public nsIStyleRuleProcessor,
public nsARefreshObserver {
public:
nsTransitionManager(nsPresContext *aPresContext);
~nsTransitionManager();
/**
* StyleContextChanged
*
* To be called from nsFrameManager::ReResolveStyleContext when the
* style of an element has changed, to initiate transitions from that
* style change.
*
* It may return a "cover rule" (see CoverTransitionStartStyleRule) to
* cover up some of the changes for the duration of the restyling of
* descendants. If it does, this function will take care of causing
* the necessary restyle afterwards, but the caller must restyle the
* element *again* with the original sequence of rules plus the
* returned cover rule as the most specific rule.
*/
already_AddRefed<nsIStyleRule>
StyleContextChanged(nsIContent *aElement,
nsStyleContext *aOldStyleContext,
nsStyleContext *aNewStyleContext);
// nsISupports
NS_DECL_ISUPPORTS_INHERITED
// nsIStyleRuleProcessor
NS_IMETHOD RulesMatching(ElementRuleProcessorData* aData);
NS_IMETHOD RulesMatching(PseudoRuleProcessorData* aData);
NS_IMETHOD HasStateDependentStyle(StateRuleProcessorData* aData,
nsReStyleHint* aResult);
NS_IMETHOD HasAttributeDependentStyle(AttributeRuleProcessorData* aData,
nsReStyleHint* aResult);
NS_IMETHOD MediumFeaturesChanged(nsPresContext* aPresContext,
PRBool* aRulesChanged);
// nsARefreshObserver
virtual void WillRefresh(mozilla::TimeStamp aTime);
private:
friend class ElementTransitions; // for TransitionsRemoved
void ConsiderStartingTransition(nsCSSProperty aProperty,
const nsTransition& aTransition,
nsIContent *aElement,
ElementTransitions *&aElementTransitions,
nsStyleContext *aOldStyleContext,
nsStyleContext *aNewStyleContext,
PRBool *aStartedAny,
nsCSSPropertySet *aWhichStarted);
ElementTransitions* GetElementTransitions(nsIContent *aElement,
nsIAtom *aPseudo,
PRBool aCreateIfNeeded);
void AddElementTransitions(ElementTransitions* aElementTransitions);
void TransitionsRemoved();
nsresult WalkTransitionRule(RuleProcessorData* aData, nsIAtom *aPseudo);
PRCList mElementTransitions;
nsPresContext *mPresContext;
};
#endif /* !defined(nsTransitionManager_h_) */