mirror of
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849 lines
32 KiB
C++
849 lines
32 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
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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 nsTransitionManager.
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*
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* The Initial Developer of the Original Code is the 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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* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (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 the GNU General Public License Version 2 or later (the "GPL"), or
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* 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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/* Code to start and animate CSS transitions. */
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#include "nsTransitionManager.h"
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#include "nsIContent.h"
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#include "nsStyleContext.h"
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#include "nsCSSProps.h"
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#include "mozilla/TimeStamp.h"
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#include "nsRefreshDriver.h"
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#include "nsRuleProcessorData.h"
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#include "nsIStyleRule.h"
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#include "nsRuleWalker.h"
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#include "nsRuleData.h"
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#include "gfxColor.h"
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#include "nsCSSPropertySet.h"
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#include "nsStyleAnimation.h"
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#include "nsEventDispatcher.h"
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#include "nsGUIEvent.h"
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#include "mozilla/dom/Element.h"
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using mozilla::TimeStamp;
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using mozilla::TimeDuration;
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namespace dom = mozilla::dom;
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namespace css = mozilla::css;
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/*****************************************************************************
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* Per-Element data *
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*****************************************************************************/
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struct ElementPropertyTransition
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{
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nsCSSProperty mProperty;
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nsStyleAnimation::Value mStartValue, mEndValue;
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TimeStamp mStartTime; // actual start plus transition delay
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// data from the relevant nsTransition
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TimeDuration mDuration;
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css::ComputedTimingFunction mTimingFunction;
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// This is the start value to be used for a check for whether a
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// transition is being reversed. Normally the same as mStartValue,
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// except when this transition started as the reversal of another
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// in-progress transition. Needed so we can handle two reverses in a
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// row.
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nsStyleAnimation::Value mStartForReversingTest;
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// Likewise, the portion (in value space) of the "full" reversed
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// transition that we're actually covering. For example, if a :hover
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// effect has a transition that moves the element 10px to the right
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// (by changing 'left' from 0px to 10px), and the mouse moves in to
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// the element (starting the transition) but then moves out after the
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// transition has advanced 4px, the second transition (from 10px/4px
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// to 0px) will have mReversePortion of 0.4. (If the mouse then moves
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// in again when the transition is back to 2px, the mReversePortion
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// for the third transition (from 0px/2px to 10px) will be 0.8.
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double mReversePortion;
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// Compute the portion of the *value* space that we should be through
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// at the given time. (The input to the transition timing function
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// has time units, the output has value units.)
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double ValuePortionFor(TimeStamp aRefreshTime) const;
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bool IsRemovedSentinel() const
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{
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return mStartTime.IsNull();
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}
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void SetRemovedSentinel()
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{
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// assign the null time stamp
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mStartTime = TimeStamp();
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}
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};
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double
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ElementPropertyTransition::ValuePortionFor(TimeStamp aRefreshTime) const
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{
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// Set |timePortion| to the portion of the way we are through the time
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// input to the transition's timing function (always within the range
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// 0-1).
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double duration = mDuration.ToSeconds();
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NS_ABORT_IF_FALSE(duration >= 0.0, "negative duration forbidden");
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double timePortion;
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if (duration == 0.0) {
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// When duration is zero, we can still have a transition when delay
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// is nonzero. mStartTime already incorporates delay.
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if (aRefreshTime >= mStartTime) {
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timePortion = 1.0;
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} else {
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timePortion = 0.0;
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}
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} else {
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timePortion = (aRefreshTime - mStartTime).ToSeconds() / duration;
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if (timePortion < 0.0)
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timePortion = 0.0; // use start value during transition-delay
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if (timePortion > 1.0)
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timePortion = 1.0; // we might be behind on flushing
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}
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return mTimingFunction.GetValue(timePortion);
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}
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struct ElementTransitions : public mozilla::css::CommonElementAnimationData
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{
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ElementTransitions(dom::Element *aElement, nsIAtom *aElementProperty,
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nsTransitionManager *aTransitionManager)
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: CommonElementAnimationData(aElement, aElementProperty,
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aTransitionManager)
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{
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}
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void EnsureStyleRuleFor(TimeStamp aRefreshTime);
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// Either zero or one for each CSS property:
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nsTArray<ElementPropertyTransition> mPropertyTransitions;
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// This style rule overrides style data with the currently
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// transitioning value for an element that is executing a transition.
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// It only matches when styling with animation. When we style without
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// animation, we need to not use it so that we can detect any new
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// changes; if necessary we restyle immediately afterwards with
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// animation.
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nsRefPtr<css::AnimValuesStyleRule> mStyleRule;
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// The refresh time associated with mStyleRule.
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TimeStamp mStyleRuleRefreshTime;
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};
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static void
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ElementTransitionsPropertyDtor(void *aObject,
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nsIAtom *aPropertyName,
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void *aPropertyValue,
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void *aData)
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{
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ElementTransitions *et = static_cast<ElementTransitions*>(aPropertyValue);
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#ifdef DEBUG
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NS_ABORT_IF_FALSE(!et->mCalledPropertyDtor, "can't call dtor twice");
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et->mCalledPropertyDtor = true;
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#endif
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delete et;
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}
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void
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ElementTransitions::EnsureStyleRuleFor(TimeStamp aRefreshTime)
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{
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if (!mStyleRule || mStyleRuleRefreshTime != aRefreshTime) {
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mStyleRule = new css::AnimValuesStyleRule();
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mStyleRuleRefreshTime = aRefreshTime;
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for (PRUint32 i = 0, i_end = mPropertyTransitions.Length(); i < i_end; ++i)
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{
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ElementPropertyTransition &pt = mPropertyTransitions[i];
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if (pt.IsRemovedSentinel()) {
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continue;
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}
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nsStyleAnimation::Value *val = mStyleRule->AddEmptyValue(pt.mProperty);
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double valuePortion = pt.ValuePortionFor(aRefreshTime);
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#ifdef DEBUG
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bool ok =
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#endif
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nsStyleAnimation::Interpolate(pt.mProperty,
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pt.mStartValue, pt.mEndValue,
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valuePortion, *val);
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NS_ABORT_IF_FALSE(ok, "could not interpolate values");
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}
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}
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}
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/*****************************************************************************
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* nsTransitionManager *
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*****************************************************************************/
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already_AddRefed<nsIStyleRule>
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nsTransitionManager::StyleContextChanged(dom::Element *aElement,
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nsStyleContext *aOldStyleContext,
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nsStyleContext *aNewStyleContext)
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{
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NS_PRECONDITION(aOldStyleContext->GetPseudo() ==
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aNewStyleContext->GetPseudo(),
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"pseudo type mismatch");
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// If we were called from ReparentStyleContext, this assertion would
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// actually fire. If we need to be called from there, we can probably
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// just remove it; the condition probably isn't critical, although
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// it's worth thinking about some more.
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NS_PRECONDITION(aOldStyleContext->HasPseudoElementData() ==
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aNewStyleContext->HasPseudoElementData(),
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"pseudo type mismatch");
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// NOTE: Things in this function (and ConsiderStartingTransition)
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// should never call PeekStyleData because we don't preserve gotten
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// structs across reframes.
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// Return sooner (before the startedAny check below) for the most
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// common case: no transitions specified or running.
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const nsStyleDisplay *disp = aNewStyleContext->GetStyleDisplay();
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nsCSSPseudoElements::Type pseudoType = aNewStyleContext->GetPseudoType();
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if (pseudoType != nsCSSPseudoElements::ePseudo_NotPseudoElement) {
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if (pseudoType != nsCSSPseudoElements::ePseudo_before &&
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pseudoType != nsCSSPseudoElements::ePseudo_after) {
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return nsnull;
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}
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NS_ASSERTION((pseudoType == nsCSSPseudoElements::ePseudo_before &&
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aElement->Tag() == nsGkAtoms::mozgeneratedcontentbefore) ||
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(pseudoType == nsCSSPseudoElements::ePseudo_after &&
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aElement->Tag() == nsGkAtoms::mozgeneratedcontentafter),
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"Unexpected aElement coming through");
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// Else the element we want to use from now on is the element the
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// :before or :after is attached to.
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aElement = aElement->GetParent()->AsElement();
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}
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ElementTransitions *et =
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GetElementTransitions(aElement, pseudoType, false);
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if (!et &&
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disp->mTransitionPropertyCount == 1 &&
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disp->mTransitions[0].GetDelay() == 0.0f &&
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disp->mTransitions[0].GetDuration() == 0.0f) {
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return nsnull;
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}
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if (aNewStyleContext->PresContext()->IsProcessingAnimationStyleChange()) {
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return nsnull;
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}
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if (aNewStyleContext->GetParent() &&
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aNewStyleContext->GetParent()->HasPseudoElementData()) {
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// Ignore transitions on things that inherit properties from
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// pseudo-elements.
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// FIXME (Bug 522599): Add tests for this.
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return nsnull;
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}
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// Per http://lists.w3.org/Archives/Public/www-style/2009Aug/0109.html
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// I'll consider only the transitions from the number of items in
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// 'transition-property' on down, and later ones will override earlier
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// ones (tracked using |whichStarted|).
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bool startedAny = false;
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nsCSSPropertySet whichStarted;
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for (PRUint32 i = disp->mTransitionPropertyCount; i-- != 0; ) {
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const nsTransition& t = disp->mTransitions[i];
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// Check delay and duration first, since they default to zero, and
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// when they're both zero, we can ignore the transition.
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if (t.GetDelay() != 0.0f || t.GetDuration() != 0.0f) {
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// We might have something to transition. See if any of the
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// properties in question changed and are animatable.
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// FIXME: Would be good to find a way to share code between this
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// interpretation of transition-property and the one below.
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nsCSSProperty property = t.GetProperty();
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if (property == eCSSPropertyExtra_no_properties ||
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property == eCSSProperty_UNKNOWN) {
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// Nothing to do, but need to exclude this from cases below.
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} else if (property == eCSSPropertyExtra_all_properties) {
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for (nsCSSProperty p = nsCSSProperty(0);
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p < eCSSProperty_COUNT_no_shorthands;
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p = nsCSSProperty(p + 1)) {
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ConsiderStartingTransition(p, t, aElement, et,
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aOldStyleContext, aNewStyleContext,
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&startedAny, &whichStarted);
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}
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} else if (nsCSSProps::IsShorthand(property)) {
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CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(subprop, property) {
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ConsiderStartingTransition(*subprop, t, aElement, et,
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aOldStyleContext, aNewStyleContext,
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&startedAny, &whichStarted);
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}
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} else {
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ConsiderStartingTransition(property, t, aElement, et,
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aOldStyleContext, aNewStyleContext,
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&startedAny, &whichStarted);
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}
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}
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}
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// Stop any transitions for properties that are no longer in
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// 'transition-property'.
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// Also stop any transitions for properties that just changed (and are
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// still in the set of properties to transition), but we didn't just
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// start the transition because delay and duration are both zero.
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if (et) {
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bool checkProperties =
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disp->mTransitions[0].GetProperty() != eCSSPropertyExtra_all_properties;
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nsCSSPropertySet allTransitionProperties;
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if (checkProperties) {
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for (PRUint32 i = disp->mTransitionPropertyCount; i-- != 0; ) {
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const nsTransition& t = disp->mTransitions[i];
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// FIXME: Would be good to find a way to share code between this
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// interpretation of transition-property and the one above.
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nsCSSProperty property = t.GetProperty();
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if (property == eCSSPropertyExtra_no_properties ||
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property == eCSSProperty_UNKNOWN) {
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// Nothing to do, but need to exclude this from cases below.
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} else if (property == eCSSPropertyExtra_all_properties) {
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for (nsCSSProperty p = nsCSSProperty(0);
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p < eCSSProperty_COUNT_no_shorthands;
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p = nsCSSProperty(p + 1)) {
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allTransitionProperties.AddProperty(p);
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}
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} else if (nsCSSProps::IsShorthand(property)) {
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CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(subprop, property) {
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allTransitionProperties.AddProperty(*subprop);
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}
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} else {
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allTransitionProperties.AddProperty(property);
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}
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}
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}
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nsTArray<ElementPropertyTransition> &pts = et->mPropertyTransitions;
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PRUint32 i = pts.Length();
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NS_ABORT_IF_FALSE(i != 0, "empty transitions list?");
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nsStyleAnimation::Value currentValue;
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do {
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--i;
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ElementPropertyTransition &pt = pts[i];
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// properties no longer in 'transition-property'
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if ((checkProperties &&
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!allTransitionProperties.HasProperty(pt.mProperty)) ||
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// properties whose computed values changed but delay and
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// duration are both zero
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!ExtractComputedValueForTransition(pt.mProperty, aNewStyleContext,
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currentValue) ||
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currentValue != pt.mEndValue) {
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// stop the transition
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pts.RemoveElementAt(i);
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}
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} while (i != 0);
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if (pts.IsEmpty()) {
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et->Destroy();
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et = nsnull;
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}
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}
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if (!startedAny) {
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return nsnull;
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}
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NS_ABORT_IF_FALSE(et, "must have element transitions if we started "
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"any transitions");
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// In the CSS working group discussion (2009 Jul 15 telecon,
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// http://www.w3.org/mid/4A5E1470.4030904@inkedblade.net ) of
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// http://lists.w3.org/Archives/Public/www-style/2009Jun/0121.html ,
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// the working group decided that a transition property on an
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// element should not cause any transitions if the property change
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// is itself inheriting a value that is transitioning on an
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// ancestor. So, to get the correct behavior, we continue the
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// restyle that caused this transition using a "covering" rule that
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// covers up any changes on which we started transitions, so that
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// descendants don't start their own transitions. (In the case of
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// negative transition delay, this covering rule produces different
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// results than applying the transition rule immediately would).
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// Our caller is responsible for restyling again using this covering
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// rule.
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nsRefPtr<css::AnimValuesStyleRule> coverRule = new css::AnimValuesStyleRule;
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if (!coverRule) {
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NS_WARNING("out of memory");
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return nsnull;
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}
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nsTArray<ElementPropertyTransition> &pts = et->mPropertyTransitions;
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for (PRUint32 i = 0, i_end = pts.Length(); i < i_end; ++i) {
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ElementPropertyTransition &pt = pts[i];
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if (whichStarted.HasProperty(pt.mProperty)) {
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coverRule->AddValue(pt.mProperty, pt.mStartValue);
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}
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}
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return coverRule.forget();
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}
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void
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nsTransitionManager::ConsiderStartingTransition(nsCSSProperty aProperty,
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const nsTransition& aTransition,
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dom::Element *aElement,
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ElementTransitions *&aElementTransitions,
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nsStyleContext *aOldStyleContext,
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nsStyleContext *aNewStyleContext,
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bool *aStartedAny,
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nsCSSPropertySet *aWhichStarted)
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{
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// IsShorthand itself will assert if aProperty is not a property.
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NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(aProperty),
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"property out of range");
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if (aWhichStarted->HasProperty(aProperty)) {
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// A later item in transition-property already started a
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// transition for this property, so we ignore this one.
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// See comment above and
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// http://lists.w3.org/Archives/Public/www-style/2009Aug/0109.html .
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return;
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}
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if (nsCSSProps::kAnimTypeTable[aProperty] == eStyleAnimType_None) {
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return;
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}
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|
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ElementPropertyTransition pt;
|
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nsStyleAnimation::Value dummyValue;
|
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bool haveValues =
|
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ExtractComputedValueForTransition(aProperty, aOldStyleContext,
|
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pt.mStartValue) &&
|
|
ExtractComputedValueForTransition(aProperty, aNewStyleContext,
|
|
pt.mEndValue);
|
|
bool shouldAnimate =
|
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haveValues &&
|
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pt.mStartValue != pt.mEndValue &&
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// Check that we can interpolate between these values
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// (If this is ever a performance problem, we could add a
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// CanInterpolate method, but it seems fine for now.)
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nsStyleAnimation::Interpolate(aProperty, pt.mStartValue, pt.mEndValue,
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0.5, dummyValue);
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PRUint32 currentIndex = nsTArray<ElementPropertyTransition>::NoIndex;
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if (aElementTransitions) {
|
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nsTArray<ElementPropertyTransition> &pts =
|
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aElementTransitions->mPropertyTransitions;
|
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for (PRUint32 i = 0, i_end = pts.Length(); i < i_end; ++i) {
|
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if (pts[i].mProperty == aProperty) {
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currentIndex = i;
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break;
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}
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}
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}
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nsPresContext *presContext = aNewStyleContext->PresContext();
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if (!shouldAnimate) {
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nsTArray<ElementPropertyTransition> &pts =
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aElementTransitions->mPropertyTransitions;
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if (currentIndex != nsTArray<ElementPropertyTransition>::NoIndex &&
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(!haveValues || pts[currentIndex].mEndValue != pt.mEndValue)) {
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// We're in the middle of a transition, but just got a
|
|
// non-transition style change changing to exactly the
|
|
// current in-progress value. (This is quite easy to cause
|
|
// using 'transition-delay'.)
|
|
//
|
|
// We also check that this current in-progress value is different
|
|
// from the end value; we don't want to cancel a transition that
|
|
// is almost done (and whose current value rounds to its end
|
|
// value) just because we got an unrelated style change.
|
|
pts.RemoveElementAt(currentIndex);
|
|
if (pts.IsEmpty()) {
|
|
aElementTransitions->Destroy();
|
|
// |aElementTransitions| is now a dangling pointer!
|
|
aElementTransitions = nsnull;
|
|
}
|
|
// WalkTransitionRule already called RestyleForAnimation.
|
|
}
|
|
return;
|
|
}
|
|
|
|
TimeStamp mostRecentRefresh =
|
|
presContext->RefreshDriver()->MostRecentRefresh();
|
|
|
|
const nsTimingFunction &tf = aTransition.GetTimingFunction();
|
|
float delay = aTransition.GetDelay();
|
|
float duration = aTransition.GetDuration();
|
|
if (duration < 0.0) {
|
|
// The spec says a negative duration is treated as zero.
|
|
duration = 0.0;
|
|
}
|
|
pt.mStartForReversingTest = pt.mStartValue;
|
|
pt.mReversePortion = 1.0;
|
|
|
|
// We need to check two things if we have a currently running
|
|
// transition for this property.
|
|
if (currentIndex != nsTArray<ElementPropertyTransition>::NoIndex) {
|
|
const ElementPropertyTransition &oldPT =
|
|
aElementTransitions->mPropertyTransitions[currentIndex];
|
|
|
|
if (oldPT.mEndValue == pt.mEndValue) {
|
|
// If we got a style change that changed the value to the endpoint
|
|
// of the currently running transition, we don't want to interrupt
|
|
// its timing function.
|
|
// WalkTransitionRule already called RestyleForAnimation.
|
|
return;
|
|
}
|
|
|
|
// If the new transition reverses the old one, we'll need to handle
|
|
// the timing differently.
|
|
if (!oldPT.IsRemovedSentinel() &&
|
|
oldPT.mStartForReversingTest == pt.mEndValue) {
|
|
// Compute the appropriate negative transition-delay such that right
|
|
// now we'd end up at the current position.
|
|
double valuePortion =
|
|
oldPT.ValuePortionFor(mostRecentRefresh) * oldPT.mReversePortion +
|
|
(1.0 - oldPT.mReversePortion);
|
|
// A timing function with negative y1 (or y2!) might make
|
|
// valuePortion negative. In this case, we still want to apply our
|
|
// reversing logic based on relative distances, not make duration
|
|
// negative.
|
|
if (valuePortion < 0.0)
|
|
valuePortion = -valuePortion;
|
|
// A timing function with y2 (or y1!) greater than one might
|
|
// advance past its terminal value. It's probably a good idea to
|
|
// clamp valuePortion to be at most one to preserve the invariant
|
|
// that a transition will complete within at most its specified
|
|
// time.
|
|
if (valuePortion > 1.0)
|
|
valuePortion = 1.0;
|
|
|
|
// Negative delays are essentially part of the transition
|
|
// function, so reduce them along with the duration, but don't
|
|
// reduce positive delays.
|
|
if (delay < 0.0f)
|
|
delay *= valuePortion;
|
|
duration *= valuePortion;
|
|
|
|
pt.mStartForReversingTest = oldPT.mEndValue;
|
|
pt.mReversePortion = valuePortion;
|
|
}
|
|
}
|
|
|
|
pt.mProperty = aProperty;
|
|
pt.mStartTime = mostRecentRefresh + TimeDuration::FromMilliseconds(delay);
|
|
pt.mDuration = TimeDuration::FromMilliseconds(duration);
|
|
pt.mTimingFunction.Init(tf);
|
|
|
|
if (!aElementTransitions) {
|
|
aElementTransitions =
|
|
GetElementTransitions(aElement, aNewStyleContext->GetPseudoType(),
|
|
true);
|
|
if (!aElementTransitions) {
|
|
NS_WARNING("allocating ElementTransitions failed");
|
|
return;
|
|
}
|
|
}
|
|
|
|
nsTArray<ElementPropertyTransition> &pts =
|
|
aElementTransitions->mPropertyTransitions;
|
|
#ifdef DEBUG
|
|
for (PRUint32 i = 0, i_end = pts.Length(); i < i_end; ++i) {
|
|
NS_ABORT_IF_FALSE(i == currentIndex ||
|
|
pts[i].mProperty != aProperty,
|
|
"duplicate transitions for property");
|
|
}
|
|
#endif
|
|
if (currentIndex != nsTArray<ElementPropertyTransition>::NoIndex) {
|
|
pts[currentIndex] = pt;
|
|
} else {
|
|
if (!pts.AppendElement(pt)) {
|
|
NS_WARNING("out of memory");
|
|
return;
|
|
}
|
|
}
|
|
|
|
nsRestyleHint hint =
|
|
aNewStyleContext->GetPseudoType() ==
|
|
nsCSSPseudoElements::ePseudo_NotPseudoElement ?
|
|
eRestyle_Self : eRestyle_Subtree;
|
|
presContext->PresShell()->RestyleForAnimation(aElement, hint);
|
|
|
|
*aStartedAny = true;
|
|
aWhichStarted->AddProperty(aProperty);
|
|
}
|
|
|
|
ElementTransitions*
|
|
nsTransitionManager::GetElementTransitions(dom::Element *aElement,
|
|
nsCSSPseudoElements::Type aPseudoType,
|
|
bool aCreateIfNeeded)
|
|
{
|
|
if (!aCreateIfNeeded && PR_CLIST_IS_EMPTY(&mElementData)) {
|
|
// Early return for the most common case.
|
|
return nsnull;
|
|
}
|
|
|
|
nsIAtom *propName;
|
|
if (aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement) {
|
|
propName = nsGkAtoms::transitionsProperty;
|
|
} else if (aPseudoType == nsCSSPseudoElements::ePseudo_before) {
|
|
propName = nsGkAtoms::transitionsOfBeforeProperty;
|
|
} else if (aPseudoType == nsCSSPseudoElements::ePseudo_after) {
|
|
propName = nsGkAtoms::transitionsOfAfterProperty;
|
|
} else {
|
|
NS_ASSERTION(!aCreateIfNeeded,
|
|
"should never try to create transitions for pseudo "
|
|
"other than :before or :after");
|
|
return nsnull;
|
|
}
|
|
ElementTransitions *et = static_cast<ElementTransitions*>(
|
|
aElement->GetProperty(propName));
|
|
if (!et && aCreateIfNeeded) {
|
|
// FIXME: Consider arena-allocating?
|
|
et = new ElementTransitions(aElement, propName, this);
|
|
if (!et) {
|
|
NS_WARNING("out of memory");
|
|
return nsnull;
|
|
}
|
|
nsresult rv = aElement->SetProperty(propName, et,
|
|
ElementTransitionsPropertyDtor, nsnull);
|
|
if (NS_FAILED(rv)) {
|
|
NS_WARNING("SetProperty failed");
|
|
delete et;
|
|
return nsnull;
|
|
}
|
|
|
|
AddElementData(et);
|
|
}
|
|
|
|
return et;
|
|
}
|
|
|
|
/*
|
|
* nsIStyleRuleProcessor implementation
|
|
*/
|
|
|
|
void
|
|
nsTransitionManager::WalkTransitionRule(RuleProcessorData* aData,
|
|
nsCSSPseudoElements::Type aPseudoType)
|
|
{
|
|
ElementTransitions *et =
|
|
GetElementTransitions(aData->mElement, aPseudoType, false);
|
|
if (!et) {
|
|
return;
|
|
}
|
|
|
|
if (aData->mPresContext->IsProcessingRestyles() &&
|
|
!aData->mPresContext->IsProcessingAnimationStyleChange()) {
|
|
// If we're processing a normal style change rather than one from
|
|
// animation, don't add the transition rule. This allows us to
|
|
// compute the new style value rather than having the transition
|
|
// override it, so that we can start transitioning differently.
|
|
|
|
// We need to immediately restyle with animation
|
|
// after doing this.
|
|
if (et) {
|
|
nsRestyleHint hint =
|
|
aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement ?
|
|
eRestyle_Self : eRestyle_Subtree;
|
|
mPresContext->PresShell()->RestyleForAnimation(aData->mElement, hint);
|
|
}
|
|
return;
|
|
}
|
|
|
|
et->EnsureStyleRuleFor(
|
|
aData->mPresContext->RefreshDriver()->MostRecentRefresh());
|
|
|
|
aData->mRuleWalker->Forward(et->mStyleRule);
|
|
}
|
|
|
|
/* virtual */ void
|
|
nsTransitionManager::RulesMatching(ElementRuleProcessorData* aData)
|
|
{
|
|
NS_ABORT_IF_FALSE(aData->mPresContext == mPresContext,
|
|
"pres context mismatch");
|
|
WalkTransitionRule(aData,
|
|
nsCSSPseudoElements::ePseudo_NotPseudoElement);
|
|
}
|
|
|
|
/* virtual */ void
|
|
nsTransitionManager::RulesMatching(PseudoElementRuleProcessorData* aData)
|
|
{
|
|
NS_ABORT_IF_FALSE(aData->mPresContext == mPresContext,
|
|
"pres context mismatch");
|
|
|
|
// Note: If we're the only thing keeping a pseudo-element frame alive
|
|
// (per ProbePseudoStyleContext), we still want to keep it alive, so
|
|
// this is ok.
|
|
WalkTransitionRule(aData, aData->mPseudoType);
|
|
}
|
|
|
|
/* virtual */ void
|
|
nsTransitionManager::RulesMatching(AnonBoxRuleProcessorData* aData)
|
|
{
|
|
}
|
|
|
|
#ifdef MOZ_XUL
|
|
/* virtual */ void
|
|
nsTransitionManager::RulesMatching(XULTreeRuleProcessorData* aData)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/* virtual */ size_t
|
|
nsTransitionManager::SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf) const
|
|
{
|
|
return CommonAnimationManager::SizeOfExcludingThis(aMallocSizeOf);
|
|
}
|
|
|
|
/* virtual */ size_t
|
|
nsTransitionManager::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const
|
|
{
|
|
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
|
|
}
|
|
|
|
struct TransitionEventInfo {
|
|
nsCOMPtr<nsIContent> mElement;
|
|
nsTransitionEvent mEvent;
|
|
|
|
TransitionEventInfo(nsIContent *aElement, nsCSSProperty aProperty,
|
|
TimeDuration aDuration)
|
|
: mElement(aElement),
|
|
mEvent(true, NS_TRANSITION_END,
|
|
NS_ConvertUTF8toUTF16(nsCSSProps::GetStringValue(aProperty)),
|
|
aDuration.ToSeconds())
|
|
{
|
|
}
|
|
|
|
// nsTransitionEvent doesn't support copy-construction, so we need
|
|
// to ourselves in order to work with nsTArray
|
|
TransitionEventInfo(const TransitionEventInfo &aOther)
|
|
: mElement(aOther.mElement),
|
|
mEvent(true, NS_TRANSITION_END,
|
|
aOther.mEvent.propertyName, aOther.mEvent.elapsedTime)
|
|
{
|
|
}
|
|
};
|
|
|
|
/* virtual */ void
|
|
nsTransitionManager::WillRefresh(mozilla::TimeStamp aTime)
|
|
{
|
|
NS_ABORT_IF_FALSE(mPresContext,
|
|
"refresh driver should not notify additional observers "
|
|
"after pres context has been destroyed");
|
|
if (!mPresContext->GetPresShell()) {
|
|
// Someone might be keeping mPresContext alive past the point
|
|
// where it has been torn down; don't bother doing anything in
|
|
// this case. But do get rid of all our transitions so we stop
|
|
// triggering refreshes.
|
|
RemoveAllElementData();
|
|
return;
|
|
}
|
|
|
|
nsTArray<TransitionEventInfo> events;
|
|
|
|
// Trim transitions that have completed, and post restyle events for
|
|
// frames that are still transitioning.
|
|
{
|
|
PRCList *next = PR_LIST_HEAD(&mElementData);
|
|
while (next != &mElementData) {
|
|
ElementTransitions *et = static_cast<ElementTransitions*>(next);
|
|
next = PR_NEXT_LINK(next);
|
|
|
|
NS_ABORT_IF_FALSE(et->mElement->GetCurrentDoc() ==
|
|
mPresContext->Document(),
|
|
"nsGenericElement::UnbindFromTree should have "
|
|
"destroyed the element transitions object");
|
|
|
|
PRUint32 i = et->mPropertyTransitions.Length();
|
|
NS_ABORT_IF_FALSE(i != 0, "empty transitions list?");
|
|
do {
|
|
--i;
|
|
ElementPropertyTransition &pt = et->mPropertyTransitions[i];
|
|
if (pt.IsRemovedSentinel()) {
|
|
// Actually remove transitions one cycle after their
|
|
// completion. See comment below.
|
|
et->mPropertyTransitions.RemoveElementAt(i);
|
|
} else if (pt.mStartTime + pt.mDuration <= aTime) {
|
|
// This transition has completed.
|
|
|
|
// Fire transitionend events only for transitions on elements
|
|
// and not those on pseudo-elements, since we can't target an
|
|
// event at pseudo-elements.
|
|
if (et->mElementProperty == nsGkAtoms::transitionsProperty) {
|
|
nsCSSProperty prop = pt.mProperty;
|
|
if (nsCSSProps::PropHasFlags(prop, CSS_PROPERTY_REPORT_OTHER_NAME))
|
|
{
|
|
prop = nsCSSProps::OtherNameFor(prop);
|
|
}
|
|
events.AppendElement(
|
|
TransitionEventInfo(et->mElement, prop, pt.mDuration));
|
|
}
|
|
|
|
// Leave this transition in the list for one more refresh
|
|
// cycle, since we haven't yet processed its style change, and
|
|
// if we also have (already, or will have from processing
|
|
// transitionend events or other refresh driver notifications)
|
|
// a non-animation style change that would affect it, we need
|
|
// to know not to start a new transition for the transition
|
|
// from the almost-completed value to the final value.
|
|
pt.SetRemovedSentinel();
|
|
}
|
|
} while (i != 0);
|
|
|
|
// We need to restyle even if the transition rule no longer
|
|
// applies (in which case we just made it not apply).
|
|
NS_ASSERTION(et->mElementProperty == nsGkAtoms::transitionsProperty ||
|
|
et->mElementProperty == nsGkAtoms::transitionsOfBeforeProperty ||
|
|
et->mElementProperty == nsGkAtoms::transitionsOfAfterProperty,
|
|
"Unexpected element property; might restyle too much");
|
|
nsRestyleHint hint = et->mElementProperty == nsGkAtoms::transitionsProperty ?
|
|
eRestyle_Self : eRestyle_Subtree;
|
|
mPresContext->PresShell()->RestyleForAnimation(et->mElement, hint);
|
|
|
|
if (et->mPropertyTransitions.IsEmpty()) {
|
|
et->Destroy();
|
|
// |et| is now a dangling pointer!
|
|
et = nsnull;
|
|
}
|
|
}
|
|
}
|
|
|
|
// We might have removed transitions above.
|
|
ElementDataRemoved();
|
|
|
|
for (PRUint32 i = 0, i_end = events.Length(); i < i_end; ++i) {
|
|
TransitionEventInfo &info = events[i];
|
|
nsEventDispatcher::Dispatch(info.mElement, mPresContext, &info.mEvent);
|
|
|
|
if (!mPresContext) {
|
|
break;
|
|
}
|
|
}
|
|
}
|