/* 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 , 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. */ #include "nsTransitionManager.h" #include "nsIContent.h" #include "nsStyleContext.h" #include "nsCSSProps.h" #include "mozilla/TimeStamp.h" #include "nsRefreshDriver.h" #include "nsRuleProcessorData.h" #include "nsIStyleRule.h" #include "nsRuleWalker.h" #include "nsRuleData.h" #include "nsSMILKeySpline.h" #include "gfxColor.h" #include "nsCSSPropertySet.h" #include "nsStyleAnimation.h" #include "nsCSSDataBlock.h" #include "nsEventDispatcher.h" #include "nsGUIEvent.h" using mozilla::TimeStamp; using mozilla::TimeDuration; /***************************************************************************** * Per-Element data * *****************************************************************************/ struct ElementPropertyTransition { nsCSSProperty mProperty; // We need to have mCurrentValue as a member of this structure because // the result of the calls to |Interpolate| might hold data that this // object's owning style rule needs to keep alive (after calling // UncomputeValue on it in MapRuleInfoInto). nsStyleAnimation::Value mStartValue, mEndValue, mCurrentValue; TimeStamp mStartTime; // actual start plus transition delay // data from the relevant nsTransition TimeDuration mDuration; nsSMILKeySpline mTimingFunction; PRBool IsRemovedSentinel() const { return mStartTime.IsNull(); } void SetRemovedSentinel() { // assign the null time stamp mStartTime = TimeStamp(); } }; /** * An ElementTransitionsStyleRule overrides style data with the * currently-transitioning value for an element that is executing a * transition. It only matches when styling with animation. When we * style without animation, we need to not use it so that we can detect * any new changes; if necessary we restyle immediately afterwards with * animation. */ class ElementTransitionsStyleRule : public nsIStyleRule { public: // nsISupportsImplementation NS_DECL_ISUPPORTS // nsIStyleRule implementation NS_IMETHOD MapRuleInfoInto(nsRuleData* aRuleData); #ifdef DEBUG NS_IMETHOD List(FILE* out = stdout, PRInt32 aIndent = 0) const; #endif ElementTransitionsStyleRule(ElementTransitions *aOwner, TimeStamp aRefreshTime) : mElementTransitions(aOwner) , mRefreshTime(aRefreshTime) {} void Disconnect() { mElementTransitions = nsnull; } ElementTransitions *ElementData() { return mElementTransitions; } TimeStamp RefreshTime() { return mRefreshTime; } private: ElementTransitions *mElementTransitions; // The time stamp for which this style rule is valid. TimeStamp mRefreshTime; }; /** * A CoverTransitionStyleRule sets any value for which we're starting a * transition back to the pre-transition value for the period when we're * resolving style on its descendants, so that we have the required * behavior for initiating transitions on such descendants. For more * detail, see comment below, above "new CoverTransitionStartStyleRule". */ class CoverTransitionStartStyleRule : public nsIStyleRule { public: // nsISupportsImplementation NS_DECL_ISUPPORTS // nsIStyleRule implementation NS_IMETHOD MapRuleInfoInto(nsRuleData* aRuleData); #ifdef DEBUG NS_IMETHOD List(FILE* out = stdout, PRInt32 aIndent = 0) const; #endif NS_HIDDEN_(void) CoverValue(nsCSSProperty aProperty, nsStyleAnimation::Value &aStartValue) { CoveredValue v = { aProperty, aStartValue }; mCoveredValues.AppendElement(v); } struct CoveredValue { nsCSSProperty mProperty; nsStyleAnimation::Value mCoveredValue; }; private: nsTArray mCoveredValues; }; struct ElementTransitions : public PRCList { ElementTransitions(nsIContent *aElement, nsIAtom *aElementProperty, nsTransitionManager *aTransitionManager) : mElement(aElement) , mElementProperty(aElementProperty) , mTransitionManager(aTransitionManager) { PR_INIT_CLIST(this); } ~ElementTransitions() { DropStyleRule(); PR_REMOVE_LINK(this); mTransitionManager->TransitionsRemoved(); } void Destroy() { // This will call our destructor. mElement->DeleteProperty(mElementProperty); } void DropStyleRule(); PRBool EnsureStyleRuleFor(TimeStamp aRefreshTime); // Either zero or one for each CSS property: nsTArray mPropertyTransitions; // The style rule for the transitions (which contains the time stamp // for which it is valid). nsRefPtr mStyleRule; nsIContent *mElement; // the atom we use in mElement's prop table (must be a static atom, // i.e., in an atom list) nsIAtom *mElementProperty; nsTransitionManager *mTransitionManager; }; static void ElementTransitionsPropertyDtor(void *aObject, nsIAtom *aPropertyName, void *aPropertyValue, void *aData) { ElementTransitions *et = static_cast(aPropertyValue); delete et; } NS_IMPL_ISUPPORTS1(ElementTransitionsStyleRule, nsIStyleRule) NS_IMETHODIMP ElementTransitionsStyleRule::MapRuleInfoInto(nsRuleData* aRuleData) { nsStyleContext *contextParent = aRuleData->mStyleContext->GetParent(); if (contextParent && contextParent->HasPseudoElementData()) { // Don't apply transitions to things inside of pseudo-elements. // FIXME (Bug 522599): Add tests for this. return NS_OK; } ElementTransitions *et = ElementData(); NS_ENSURE_TRUE(et, NS_OK); // FIXME (Bug 522597): Why can this be null? for (PRUint32 i = 0, i_end = et->mPropertyTransitions.Length(); i < i_end; ++i) { ElementPropertyTransition &pt = et->mPropertyTransitions[i]; if (pt.IsRemovedSentinel()) { continue; } if (aRuleData->mSIDs & nsCachedStyleData::GetBitForSID( nsCSSProps::kSIDTable[pt.mProperty])) { double timePortion = (RefreshTime() - pt.mStartTime).ToSeconds() / pt.mDuration.ToSeconds(); if (timePortion < 0.0) timePortion = 0.0; // use start value during transition-delay if (timePortion > 1.0) timePortion = 1.0; // we might be behind on flushing double valuePortion = pt.mTimingFunction.GetSplineValue(timePortion); #ifdef DEBUG PRBool ok = #endif nsStyleAnimation::Interpolate(pt.mProperty, pt.mStartValue, pt.mEndValue, valuePortion, pt.mCurrentValue); NS_ABORT_IF_FALSE(ok, "could not interpolate values"); void *prop = nsCSSExpandedDataBlock::RuleDataPropertyAt(aRuleData, pt.mProperty); #ifdef DEBUG ok = #endif nsStyleAnimation::UncomputeValue(pt.mProperty, aRuleData->mPresContext, pt.mCurrentValue, prop); NS_ABORT_IF_FALSE(ok, "could not store computed value"); } } return NS_OK; } #ifdef DEBUG NS_IMETHODIMP ElementTransitionsStyleRule::List(FILE* out, PRInt32 aIndent) const { // WRITE ME? return NS_OK; } #endif void ElementTransitions::DropStyleRule() { if (mStyleRule) { mStyleRule->Disconnect(); mStyleRule = nsnull; } } PRBool ElementTransitions::EnsureStyleRuleFor(TimeStamp aRefreshTime) { if (!mStyleRule || mStyleRule->RefreshTime() != aRefreshTime) { DropStyleRule(); ElementTransitionsStyleRule *newRule = new ElementTransitionsStyleRule(this, aRefreshTime); if (!newRule) { NS_WARNING("out of memory"); return PR_FALSE; } mStyleRule = newRule; } return PR_TRUE; } NS_IMPL_ISUPPORTS1(CoverTransitionStartStyleRule, nsIStyleRule) NS_IMETHODIMP CoverTransitionStartStyleRule::MapRuleInfoInto(nsRuleData* aRuleData) { for (PRUint32 i = 0, i_end = mCoveredValues.Length(); i < i_end; ++i) { CoveredValue &cv = mCoveredValues[i]; if (aRuleData->mSIDs & nsCachedStyleData::GetBitForSID( nsCSSProps::kSIDTable[cv.mProperty])) { void *prop = nsCSSExpandedDataBlock::RuleDataPropertyAt(aRuleData, cv.mProperty); #ifdef DEBUG PRBool ok = #endif nsStyleAnimation::UncomputeValue(cv.mProperty, aRuleData->mPresContext, cv.mCoveredValue, prop); NS_ABORT_IF_FALSE(ok, "could not store computed value"); } } return NS_OK; } #ifdef DEBUG NS_IMETHODIMP CoverTransitionStartStyleRule::List(FILE* out, PRInt32 aIndent) const { // WRITE ME? return NS_OK; } #endif /***************************************************************************** * nsTransitionManager * *****************************************************************************/ nsTransitionManager::nsTransitionManager(nsPresContext *aPresContext) : mPresContext(aPresContext) { PR_INIT_CLIST(&mElementTransitions); } nsTransitionManager::~nsTransitionManager() { NS_ABORT_IF_FALSE(!mPresContext, "Disconnect should have been called"); } void nsTransitionManager::Disconnect() { // Content nodes might outlive the transition manager. while (!PR_CLIST_IS_EMPTY(&mElementTransitions)) { ElementTransitions *head = static_cast( PR_LIST_HEAD(&mElementTransitions)); head->Destroy(); } mPresContext = nsnull; } static PRBool TransExtractComputedValue(nsCSSProperty aProperty, nsStyleContext* aStyleContext, nsStyleAnimation::Value& aComputedValue) { PRBool result = nsStyleAnimation::ExtractComputedValue(aProperty, aStyleContext, aComputedValue); if (aProperty == eCSSProperty_visibility) { NS_ABORT_IF_FALSE(aComputedValue.GetUnit() == nsStyleAnimation::eUnit_Enumerated, "unexpected unit"); aComputedValue.SetIntValue(aComputedValue.GetIntValue(), nsStyleAnimation::eUnit_Visibility); } return result; } already_AddRefed nsTransitionManager::StyleContextChanged(nsIContent *aElement, nsStyleContext *aOldStyleContext, nsStyleContext *aNewStyleContext) { NS_PRECONDITION(aOldStyleContext->GetPseudo() == aNewStyleContext->GetPseudo(), "pseudo type mismatch"); // If we were called from ReParentStyleContext, this assertion would // actually fire. If we need to be called from there, we can probably // just remove it; the condition probably isn't critical, although // it's worth thinking about some more. NS_PRECONDITION(aOldStyleContext->HasPseudoElementData() == aNewStyleContext->HasPseudoElementData(), "pseudo type mismatch"); // NOTE: Things in this function (and ConsiderStartingTransition) // should never call PeekStyleData because we don't preserve gotten // structs across reframes. // Return sooner (before the startedAny check below) for the most // common case: no transitions specified or running. const nsStyleDisplay *disp = aNewStyleContext->GetStyleDisplay(); nsCSSPseudoElements::Type pseudoType = aNewStyleContext->GetPseudoType(); ElementTransitions *et = GetElementTransitions(aElement, pseudoType, PR_FALSE); if (!et && disp->mTransitionPropertyCount == 1 && disp->mTransitions[0].GetDelay() == 0.0f && disp->mTransitions[0].GetDuration() == 0.0f) { return nsnull; } if (aNewStyleContext->PresContext()->IsProcessingAnimationStyleChange()) { return nsnull; } if (pseudoType != nsCSSPseudoElements::ePseudo_NotPseudoElement && pseudoType != nsCSSPseudoElements::ePseudo_before && pseudoType != nsCSSPseudoElements::ePseudo_after) { return nsnull; } if (aNewStyleContext->GetParent() && aNewStyleContext->GetParent()->HasPseudoElementData()) { // Ignore transitions on things that inherit properties from // pseudo-elements. // FIXME (Bug 522599): Add tests for this. return nsnull; } // Per http://lists.w3.org/Archives/Public/www-style/2009Aug/0109.html // I'll consider only the transitions from the number of items in // 'transition-property' on down, and later ones will override earlier // ones (tracked using |whichStarted|). PRBool startedAny = PR_FALSE; nsCSSPropertySet whichStarted; for (PRUint32 i = disp->mTransitionPropertyCount; i-- != 0; ) { const nsTransition& t = disp->mTransitions[i]; // Check delay and duration first, since they default to zero, and // when they're both zero, we can ignore the transition. if (t.GetDelay() != 0.0f || t.GetDuration() != 0.0f) { // We might have something to transition. See if any of the // properties in question changed and are animatable. // FIXME: Would be good to find a way to share code between this // interpretation of transition-property and the one below. nsCSSProperty property = t.GetProperty(); if (property == eCSSPropertyExtra_no_properties || property == eCSSProperty_UNKNOWN) { // Nothing to do, but need to exclude this from cases below. } else if (property == eCSSPropertyExtra_all_properties) { for (nsCSSProperty p = nsCSSProperty(0); p < eCSSProperty_COUNT_no_shorthands; p = nsCSSProperty(p + 1)) { ConsiderStartingTransition(p, t, aElement, et, aOldStyleContext, aNewStyleContext, &startedAny, &whichStarted); } } else if (nsCSSProps::IsShorthand(property)) { CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(subprop, property) { ConsiderStartingTransition(*subprop, t, aElement, et, aOldStyleContext, aNewStyleContext, &startedAny, &whichStarted); } } else { ConsiderStartingTransition(property, t, aElement, et, aOldStyleContext, aNewStyleContext, &startedAny, &whichStarted); } } } // Stop any transitions for properties that are no longer in // 'transition-property'. // Also stop any transitions for properties that just changed (and are // still in the set of properties to transition), but we didn't just // start the transition because delay and duration are both zero. if (et) { PRBool checkProperties = disp->mTransitions[0].GetProperty() != eCSSPropertyExtra_all_properties; nsCSSPropertySet allTransitionProperties; if (checkProperties) { for (PRUint32 i = disp->mTransitionPropertyCount; i-- != 0; ) { const nsTransition& t = disp->mTransitions[i]; // FIXME: Would be good to find a way to share code between this // interpretation of transition-property and the one above. nsCSSProperty property = t.GetProperty(); if (property == eCSSPropertyExtra_no_properties || property == eCSSProperty_UNKNOWN) { // Nothing to do, but need to exclude this from cases below. } else if (property == eCSSPropertyExtra_all_properties) { for (nsCSSProperty p = nsCSSProperty(0); p < eCSSProperty_COUNT_no_shorthands; p = nsCSSProperty(p + 1)) { allTransitionProperties.AddProperty(p); } } else if (nsCSSProps::IsShorthand(property)) { CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(subprop, property) { allTransitionProperties.AddProperty(*subprop); } } else { allTransitionProperties.AddProperty(property); } } } nsTArray &pts = et->mPropertyTransitions; PRUint32 i = pts.Length(); NS_ABORT_IF_FALSE(i != 0, "empty transitions list?"); nsStyleAnimation::Value currentValue; do { --i; ElementPropertyTransition &pt = pts[i]; // properties no longer in 'transition-property' if ((checkProperties && !allTransitionProperties.HasProperty(pt.mProperty)) || // properties whose computed values changed but delay and // duration are both zero !TransExtractComputedValue(pt.mProperty, aNewStyleContext, currentValue) || currentValue != pt.mEndValue) { // stop the transition pts.RemoveElementAt(i); } } while (i != 0); if (pts.IsEmpty()) { et->Destroy(); et = nsnull; } } if (!startedAny) { return nsnull; } NS_ABORT_IF_FALSE(et, "must have element transitions if we started " "any transitions"); // In the CSS working group discussion (2009 Jul 15 telecon, // http://www.w3.org/mid/4A5E1470.4030904@inkedblade.net ) of // http://lists.w3.org/Archives/Public/www-style/2009Jun/0121.html , // the working group decided that a transition property on an // element should not cause any transitions if the property change // is itself inheriting a value that is transitioning on an // ancestor. So, to get the correct behavior, we continue the // restyle that caused this transition using a "covering" rule that // covers up any changes on which we started transitions, so that // descendants don't start their own transitions. (In the case of // negative transition delay, this covering rule produces different // results than applying the transition rule immediately would). // Our caller is responsible for restyling again using this covering // rule. nsRefPtr coverRule = new CoverTransitionStartStyleRule; if (!coverRule) { NS_WARNING("out of memory"); return nsnull; } nsTArray &pts = et->mPropertyTransitions; for (PRUint32 i = 0, i_end = pts.Length(); i < i_end; ++i) { ElementPropertyTransition &pt = pts[i]; if (whichStarted.HasProperty(pt.mProperty)) { coverRule->CoverValue(pt.mProperty, pt.mStartValue); } } return already_AddRefed( static_cast(coverRule.forget().get())); } void nsTransitionManager::ConsiderStartingTransition(nsCSSProperty aProperty, const nsTransition& aTransition, nsIContent *aElement, ElementTransitions *&aElementTransitions, nsStyleContext *aOldStyleContext, nsStyleContext *aNewStyleContext, PRBool *aStartedAny, nsCSSPropertySet *aWhichStarted) { // IsShorthand itself will assert if aProperty is not a property. NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(aProperty), "property out of range"); if (aWhichStarted->HasProperty(aProperty)) { // A later item in transition-property already started a // transition for this property, so we ignore this one. // See comment above and // http://lists.w3.org/Archives/Public/www-style/2009Aug/0109.html . return; } if (nsCSSProps::kAnimTypeTable[aProperty] == eStyleAnimType_None) { return; } ElementPropertyTransition pt; nsStyleAnimation::Value dummyValue; PRBool shouldAnimate = TransExtractComputedValue(aProperty, aOldStyleContext, pt.mStartValue) && TransExtractComputedValue(aProperty, aNewStyleContext, pt.mEndValue) && pt.mStartValue != pt.mEndValue && // Check that we can interpolate between these values // (If this is ever a performance problem, we could add a // CanInterpolate method, but it seems fine for now.) nsStyleAnimation::Interpolate(aProperty, pt.mStartValue, pt.mEndValue, 0.5, dummyValue); PRUint32 currentIndex = nsTArray::NoIndex; if (aElementTransitions) { nsTArray &pts = aElementTransitions->mPropertyTransitions; for (PRUint32 i = 0, i_end = pts.Length(); i < i_end; ++i) { if (pts[i].mProperty == aProperty) { currentIndex = i; break; } } } nsPresContext *presContext = aNewStyleContext->PresContext(); if (!shouldAnimate) { if (currentIndex != nsTArray::NoIndex) { // 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'.) nsTArray &pts = aElementTransitions->mPropertyTransitions; pts.RemoveElementAt(currentIndex); if (pts.IsEmpty()) { aElementTransitions->Destroy(); // |aElementTransitions| is now a dangling pointer! aElementTransitions = nsnull; } // WalkTransitionRule already called RestyleForAnimation. } return; } // When we interrupt a running transition, we want to reduce the // duration of the new transition *if* the new transition would have // been longer had it started from the endpoint of the currently // running transition. double durationFraction = 1.0; // We need to check two things if we have a currently running // transition for this property: see durationFraction comment above // and the endpoint check below. if (currentIndex != nsTArray::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; } double fullDistance, remainingDistance; #ifdef DEBUG PRBool ok = #endif nsStyleAnimation::ComputeDistance(aProperty, pt.mStartValue, pt.mEndValue, fullDistance); NS_ABORT_IF_FALSE(ok, "could not compute distance"); NS_ABORT_IF_FALSE(fullDistance >= 0.0, "distance must be positive"); if (!oldPT.IsRemovedSentinel() && nsStyleAnimation::ComputeDistance(aProperty, oldPT.mEndValue, pt.mEndValue, remainingDistance)) { NS_ABORT_IF_FALSE(remainingDistance >= 0.0, "distance must be positive"); durationFraction = fullDistance / remainingDistance; if (durationFraction > 1.0) { durationFraction = 1.0; } } } nsRefreshDriver *rd = presContext->RefreshDriver(); pt.mProperty = aProperty; float delay = aTransition.GetDelay(); float duration = aTransition.GetDuration(); if (durationFraction != 1.0) { // Negative delays are essentially part of the transition // function, so reduce them along with the duration, but don't // reduce positive delays. (See comment above about // durationFraction.) if (delay < 0.0f) delay *= durationFraction; duration *= durationFraction; } pt.mStartTime = rd->MostRecentRefresh() + TimeDuration::FromMilliseconds(delay); pt.mDuration = TimeDuration::FromMilliseconds(duration); const nsTimingFunction &tf = aTransition.GetTimingFunction(); pt.mTimingFunction.Init(tf.mX1, tf.mY1, tf.mX2, tf.mY2); if (!aElementTransitions) { aElementTransitions = GetElementTransitions(aElement, aNewStyleContext->GetPseudoType(), PR_TRUE); if (!aElementTransitions) { NS_WARNING("allocating ElementTransitions failed"); return; } } nsTArray &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::NoIndex) { pts[currentIndex] = pt; } else { if (!pts.AppendElement(pt)) { NS_WARNING("out of memory"); return; } } presContext->PresShell()->RestyleForAnimation(aElement); *aStartedAny = PR_TRUE; aWhichStarted->AddProperty(aProperty); } ElementTransitions* nsTransitionManager::GetElementTransitions(nsIContent *aElement, nsCSSPseudoElements::Type aPseudoType, PRBool aCreateIfNeeded) { if (!aCreateIfNeeded && PR_CLIST_IS_EMPTY(&mElementTransitions)) { // 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( 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; } AddElementTransitions(et); } return et; } void nsTransitionManager::AddElementTransitions(ElementTransitions* aElementTransitions) { if (PR_CLIST_IS_EMPTY(&mElementTransitions)) { // We need to observe the refresh driver. nsRefreshDriver *rd = mPresContext->RefreshDriver(); rd->AddRefreshObserver(this, Flush_Style); } PR_INSERT_BEFORE(aElementTransitions, &mElementTransitions); } /* * nsISupports implementation */ NS_IMPL_ISUPPORTS1(nsTransitionManager, nsIStyleRuleProcessor) /* * nsIStyleRuleProcessor implementation */ nsresult nsTransitionManager::WalkTransitionRule(RuleProcessorData* aData, nsCSSPseudoElements::Type aPseudoType) { if (!aData->mContent) { return NS_OK; } ElementTransitions *et = GetElementTransitions(aData->mContent, aPseudoType, PR_FALSE); if (!et) { return NS_OK; } if (!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) { mPresContext->PresShell()->RestyleForAnimation(aData->mContent); } return NS_OK; } if (!et->EnsureStyleRuleFor( aData->mPresContext->RefreshDriver()->MostRecentRefresh())) { return NS_ERROR_OUT_OF_MEMORY; } aData->mRuleWalker->Forward(et->mStyleRule); return NS_OK; } NS_IMETHODIMP nsTransitionManager::RulesMatching(ElementRuleProcessorData* aData) { NS_ABORT_IF_FALSE(aData->mPresContext == mPresContext, "pres context mismatch"); return WalkTransitionRule(aData, nsCSSPseudoElements::ePseudo_NotPseudoElement); } NS_IMETHODIMP 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. return WalkTransitionRule(aData, aData->mPseudoType); } NS_IMETHODIMP nsTransitionManager::RulesMatching(AnonBoxRuleProcessorData* aData) { return NS_OK; } #ifdef MOZ_XUL NS_IMETHODIMP nsTransitionManager::RulesMatching(XULTreeRuleProcessorData* aData) { return NS_OK; } #endif nsReStyleHint nsTransitionManager::HasStateDependentStyle(StateRuleProcessorData* aData) { return nsReStyleHint(0); } nsReStyleHint nsTransitionManager::HasAttributeDependentStyle(AttributeRuleProcessorData* aData) { return nsReStyleHint(0); } NS_IMETHODIMP nsTransitionManager::MediumFeaturesChanged(nsPresContext* aPresContext, PRBool* aRulesChanged) { *aRulesChanged = PR_FALSE; return NS_OK; } struct TransitionEventInfo { nsCOMPtr mElement; nsTransitionEvent mEvent; TransitionEventInfo(nsIContent *aElement, nsCSSProperty aProperty, TimeDuration aDuration) : mElement(aElement), mEvent(PR_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(PR_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"); nsTArray events; // Trim transitions that have completed, and post restyle events for // frames that are still transitioning. { PRCList *next = PR_LIST_HEAD(&mElementTransitions); while (next != &mElementTransitions) { ElementTransitions *et = static_cast(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. 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). mPresContext->PresShell()->RestyleForAnimation(et->mElement); if (et->mPropertyTransitions.IsEmpty()) { et->Destroy(); // |et| is now a dangling pointer! et = nsnull; } } } // We might have removed transitions above. TransitionsRemoved(); 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; } } } void nsTransitionManager::TransitionsRemoved() { // If we have no transitions left, remove ourselves from the refresh // driver. if (PR_CLIST_IS_EMPTY(&mElementTransitions)) { mPresContext->RefreshDriver()->RemoveRefreshObserver(this, Flush_Style); } }