зеркало из https://github.com/mozilla/gecko-dev.git
servo: Merge #17570 - Implement :visited support for lazy pseudo-elements (from bzbarsky:visited-pseudos); r=jryans
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This commit is contained in:
Родитель
a0fc47069d
Коммит
4fdbba3a10
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@ -426,6 +426,7 @@ pub trait ThreadSafeLayoutElement: Clone + Copy + Sized + Debug +
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&style_pseudo,
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RuleInclusion::All,
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data.styles.primary(),
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/* is_probe = */ false,
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&ServoMetricsProvider)
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.unwrap()
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.clone()
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@ -184,7 +184,7 @@ impl Default for CascadeInputs {
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impl CascadeInputs {
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/// Construct inputs from previous cascade results, if any.
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fn new_from_style(style: &Arc<ComputedValues>) -> Self {
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pub fn new_from_style(style: &Arc<ComputedValues>) -> Self {
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CascadeInputs {
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rules: style.rules.clone(),
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visited_rules: style.get_visited_style().and_then(|v| v.rules.clone()),
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@ -204,6 +204,11 @@ impl CascadeInputs {
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self.rules.as_mut()
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}
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/// Gets a reference to the rule node, if any.
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pub fn get_rules(&self) -> Option<&StrongRuleNode> {
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self.rules.as_ref()
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}
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/// Gets a reference to the rule node. Panic if the element does not have
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/// rule node.
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pub fn rules(&self) -> &StrongRuleNode {
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@ -151,7 +151,10 @@ impl CascadeVisitedMode {
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fn rules<'a>(&self, inputs: &'a CascadeInputs) -> &'a StrongRuleNode {
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match *self {
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CascadeVisitedMode::Unvisited => inputs.rules(),
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CascadeVisitedMode::Visited => inputs.visited_rules(),
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CascadeVisitedMode::Visited => match inputs.get_visited_rules() {
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Some(rules) => rules,
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None => inputs.rules(),
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}
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}
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}
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@ -166,7 +169,7 @@ impl CascadeVisitedMode {
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/// Returns the computed values based on the cascade mode. In visited mode,
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/// visited values are only returned if they already exist. If they don't,
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/// we fallback to the regular, unvisited styles.
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fn values<'a>(&self, values: &'a Arc<ComputedValues>) -> &'a Arc<ComputedValues> {
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pub fn values<'a>(&self, values: &'a Arc<ComputedValues>) -> &'a Arc<ComputedValues> {
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if *self == CascadeVisitedMode::Visited && values.get_visited_style().is_some() {
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return values.visited_style();
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}
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@ -288,10 +291,35 @@ trait PrivateMatchMethods: TElement {
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}
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}
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/// Get the ComputedValues (if any) for our inheritance parent.
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fn get_inherited_style_and_parent(&self) -> ParentElementAndStyle<Self> {
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let parent_el = self.inheritance_parent();
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let parent_data = parent_el.as_ref().and_then(|e| e.borrow_data());
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let parent_style = parent_data.as_ref().map(|d| {
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// Sometimes Gecko eagerly styles things without processing
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// pending restyles first. In general we'd like to avoid this,
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// but there can be good reasons (for example, needing to
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// construct a frame for some small piece of newly-added
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// content in order to do something specific with that frame,
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// but not wanting to flush all of layout).
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debug_assert!(cfg!(feature = "gecko") ||
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parent_el.unwrap().has_current_styles(d));
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d.styles.primary()
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});
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ParentElementAndStyle {
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element: parent_el,
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style: parent_style.cloned(),
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}
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}
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/// A common path for the cascade used by both primary elements and eager
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/// pseudo-elements after collecting the appropriate rules to use.
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///
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/// `primary_style` is expected to be Some for eager pseudo-elements.
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///
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/// `parent_info` is our style parent and its primary style, if
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/// it's already been computed.
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fn cascade_with_rules(&self,
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shared_context: &SharedStyleContext,
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font_metrics_provider: &FontMetricsProvider,
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@ -299,6 +327,7 @@ trait PrivateMatchMethods: TElement {
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primary_style: Option<&Arc<ComputedValues>>,
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cascade_target: CascadeTarget,
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cascade_visited: CascadeVisitedMode,
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parent_info: Option<&ParentElementAndStyle<Self>>,
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visited_values_to_insert: Option<Arc<ComputedValues>>)
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-> Arc<ComputedValues> {
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let mut cascade_info = CascadeInfo::new();
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@ -318,23 +347,18 @@ trait PrivateMatchMethods: TElement {
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// Grab the inherited values.
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let parent_el;
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let parent_data;
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let element_and_style; // So parent_el and style_to_inherit_from are known live.
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let style_to_inherit_from = match cascade_target {
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CascadeTarget::Normal => {
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parent_el = self.inheritance_parent();
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parent_data = parent_el.as_ref().and_then(|e| e.borrow_data());
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let parent_style = parent_data.as_ref().map(|d| {
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// Sometimes Gecko eagerly styles things without processing
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// pending restyles first. In general we'd like to avoid this,
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// but there can be good reasons (for example, needing to
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// construct a frame for some small piece of newly-added
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// content in order to do something specific with that frame,
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// but not wanting to flush all of layout).
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debug_assert!(cfg!(feature = "gecko") ||
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parent_el.unwrap().has_current_styles(d));
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d.styles.primary()
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});
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parent_style.map(|s| cascade_visited.values(s))
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let info = match parent_info {
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Some(element_and_style) => element_and_style,
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None => {
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element_and_style = self.get_inherited_style_and_parent();
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&element_and_style
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}
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};
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parent_el = info.element;
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info.style.as_ref().map(|s| cascade_visited.values(s))
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}
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CascadeTarget::EagerPseudo => {
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parent_el = Some(self.clone());
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@ -391,11 +415,15 @@ trait PrivateMatchMethods: TElement {
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/// pseudo-elements.
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///
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/// `primary_style` is expected to be Some for eager pseudo-elements.
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///
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/// `parent_info` is our style parent and its primary style, if
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/// it's already been computed.
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fn cascade_internal(&self,
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context: &StyleContext<Self>,
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primary_style: Option<&Arc<ComputedValues>>,
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primary_inputs: &CascadeInputs,
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eager_pseudo_inputs: Option<&CascadeInputs>,
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parent_info: Option<&ParentElementAndStyle<Self>>,
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cascade_visited: CascadeVisitedMode)
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-> Arc<ComputedValues> {
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if let Some(pseudo) = self.implemented_pseudo_element() {
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@ -459,15 +487,19 @@ trait PrivateMatchMethods: TElement {
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primary_style,
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cascade_target,
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cascade_visited,
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parent_info,
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visited_values_to_insert)
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}
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/// Computes values and damage for the primary style of an element, setting
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/// them on the ElementData.
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///
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/// `parent_info` is our style parent and its primary style.
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fn cascade_primary(&self,
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context: &mut StyleContext<Self>,
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data: &mut ElementData,
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important_rules_changed: bool,
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parent_info: &ParentElementAndStyle<Self>,
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cascade_visited: CascadeVisitedMode)
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-> ChildCascadeRequirement {
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debug!("Cascade primary for {:?}, visited: {:?}", self, cascade_visited);
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@ -485,7 +517,10 @@ trait PrivateMatchMethods: TElement {
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// visited case. This early return is especially important for the
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// `cascade_primary_and_pseudos` path since we rely on the state of
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// some previous matching run.
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if !cascade_visited.has_rules(primary_inputs) {
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//
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// Note that we cannot take this early return if our parent has
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// visited style, because then we too have visited style.
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if !cascade_visited.has_rules(primary_inputs) && !parent_info.has_visited_style() {
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return ChildCascadeRequirement::CanSkipCascade
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}
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@ -494,6 +529,7 @@ trait PrivateMatchMethods: TElement {
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None,
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primary_inputs,
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None,
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/* parent_info = */ None,
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cascade_visited)
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};
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@ -582,6 +618,7 @@ trait PrivateMatchMethods: TElement {
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data.styles.get_primary(),
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primary_inputs,
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Some(pseudo_inputs),
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/* parent_info = */ None,
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cascade_visited)
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};
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@ -625,6 +662,7 @@ trait PrivateMatchMethods: TElement {
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Some(primary_style),
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CascadeTarget::Normal,
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CascadeVisitedMode::Unvisited,
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/* parent_info = */ None,
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None))
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}
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@ -877,6 +915,23 @@ trait PrivateMatchMethods: TElement {
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impl<E: TElement> PrivateMatchMethods for E {}
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/// A struct that holds an element we inherit from and its ComputedValues.
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#[derive(Debug)]
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struct ParentElementAndStyle<E: TElement> {
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/// Our style parent element.
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element: Option<E>,
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/// Element's primary ComputedValues. Not a borrow because we can't prove
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/// that the thing hanging off element won't change while we're passing this
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/// struct around.
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style: Option<Arc<ComputedValues>>,
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}
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impl<E: TElement> ParentElementAndStyle<E> {
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fn has_visited_style(&self) -> bool {
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self.style.as_ref().map_or(false, |v| { v.get_visited_style().is_some() })
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}
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}
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/// Collects the outputs of the primary matching process, including the rule
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/// node and other associated data.
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#[derive(Debug)]
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@ -944,13 +999,21 @@ pub trait MatchMethods : TElement {
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let relevant_link_found = primary_results.relevant_link_found;
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if relevant_link_found {
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self.match_primary(context, data, VisitedHandlingMode::RelevantLinkVisited);
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}
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// Even if there is no relevant link, we need to cascade visited styles
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// if our parent has visited styles.
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let parent_and_styles = self.get_inherited_style_and_parent();
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if relevant_link_found || parent_and_styles.has_visited_style() {
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self.cascade_primary(context, data, important_rules_changed,
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&parent_and_styles,
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CascadeVisitedMode::Visited);
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}
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// Cascade properties and compute primary values.
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let child_cascade_requirement =
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self.cascade_primary(context, data, important_rules_changed,
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&parent_and_styles,
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CascadeVisitedMode::Unvisited);
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// Match and cascade eager pseudo-elements.
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@ -1017,10 +1080,13 @@ pub trait MatchMethods : TElement {
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// visited ComputedValues are placed within the regular ComputedValues,
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// which is immutable after the cascade. If there aren't any visited
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// rules, these calls will return without cascading.
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let parent_and_styles = self.get_inherited_style_and_parent();
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self.cascade_primary(context, &mut data, important_rules_changed,
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&parent_and_styles,
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CascadeVisitedMode::Visited);
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let child_cascade_requirement =
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self.cascade_primary(context, &mut data, important_rules_changed,
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&parent_and_styles,
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CascadeVisitedMode::Unvisited);
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self.cascade_pseudos(context, &mut data, CascadeVisitedMode::Visited);
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self.cascade_pseudos(context, &mut data, CascadeVisitedMode::Unvisited);
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@ -1211,8 +1277,10 @@ pub trait MatchMethods : TElement {
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// Compute rule nodes for eagerly-cascaded pseudo-elements.
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let mut matches_different_pseudos = false;
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SelectorImpl::each_eagerly_cascaded_pseudo_element(|pseudo| {
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// For pseudo-elements, we only try to match visited rules if there
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// are also unvisited rules. (This matches Gecko's behavior.)
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// For eager pseudo-elements, we only try to match visited rules if
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// there are also unvisited rules. (This matches Gecko's behavior
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// for probing pseudo-elements, and for eager pseudo-elements Gecko
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// does not try to resolve style if the probe says there isn't any.)
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if visited_handling == VisitedHandlingMode::RelevantLinkVisited &&
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!context.cascade_inputs().pseudos.has(&pseudo) {
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return
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@ -1587,6 +1655,7 @@ pub trait MatchMethods : TElement {
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Some(primary_style),
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CascadeTarget::Normal,
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CascadeVisitedMode::Unvisited,
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/* parent_info = */ None,
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None)
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}
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@ -7,7 +7,7 @@
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use {Atom, LocalName, Namespace};
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use applicable_declarations::{ApplicableDeclarationBlock, ApplicableDeclarationList};
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use bit_vec::BitVec;
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use context::QuirksMode;
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use context::{CascadeInputs, QuirksMode};
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use dom::TElement;
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use element_state::ElementState;
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use error_reporting::create_error_reporter;
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@ -16,6 +16,7 @@ use font_metrics::FontMetricsProvider;
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use gecko_bindings::structs::{nsIAtom, StyleRuleInclusion};
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use invalidation::element::invalidation_map::InvalidationMap;
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use invalidation::media_queries::EffectiveMediaQueryResults;
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use matching::CascadeVisitedMode;
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use media_queries::Device;
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use properties::{self, CascadeFlags, ComputedValues};
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use properties::{AnimationRules, PropertyDeclarationBlock};
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@ -27,7 +28,7 @@ use selector_parser::{SelectorImpl, PseudoElement};
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use selectors::attr::NamespaceConstraint;
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use selectors::bloom::BloomFilter;
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use selectors::matching::{ElementSelectorFlags, matches_selector, MatchingContext, MatchingMode};
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use selectors::matching::AFFECTED_BY_PRESENTATIONAL_HINTS;
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use selectors::matching::{VisitedHandlingMode, AFFECTED_BY_PRESENTATIONAL_HINTS};
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use selectors::parser::{AncestorHashes, Combinator, Component, Selector, SelectorAndHashes};
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use selectors::parser::{SelectorIter, SelectorMethods};
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use selectors::sink::Push;
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@ -679,47 +680,90 @@ impl Stylist {
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element: &E,
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pseudo: &PseudoElement,
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rule_inclusion: RuleInclusion,
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parent_style: &ComputedValues,
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parent_style: &Arc<ComputedValues>,
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is_probe: bool,
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font_metrics: &FontMetricsProvider)
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-> Option<Arc<ComputedValues>>
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where E: TElement,
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{
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let rule_node =
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self.lazy_pseudo_rules(guards, element, pseudo, rule_inclusion);
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self.compute_pseudo_element_style_with_rulenode(rule_node.as_ref(),
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let cascade_inputs =
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self.lazy_pseudo_rules(guards, element, pseudo, is_probe, rule_inclusion);
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self.compute_pseudo_element_style_with_inputs(&cascade_inputs,
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guards,
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parent_style,
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font_metrics)
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}
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/// Computes a pseudo-element style lazily using the given rulenode. This
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/// can be used for truly lazy pseudo-elements or to avoid redoing selector
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/// matching for eager pseudo-elements when we need to recompute their style
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/// with a new parent style.
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pub fn compute_pseudo_element_style_with_rulenode(&self,
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rule_node: Option<&StrongRuleNode>,
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/// Computes a pseudo-element style lazily using the given CascadeInputs.
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/// This can be used for truly lazy pseudo-elements or to avoid redoing
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/// selector matching for eager pseudo-elements when we need to recompute
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/// their style with a new parent style.
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pub fn compute_pseudo_element_style_with_inputs(&self,
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inputs: &CascadeInputs,
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guards: &StylesheetGuards,
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parent_style: &ComputedValues,
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parent_style: &Arc<ComputedValues>,
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font_metrics: &FontMetricsProvider)
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-> Option<Arc<ComputedValues>>
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{
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let rule_node = match rule_node {
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Some(rule_node) => rule_node,
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None => return None
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// We may have only visited rules in cases when we are actually
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// resolving, not probing, pseudo-element style.
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if !inputs.has_rules() && !inputs.has_visited_rules() {
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return None
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}
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// We need to compute visited values if we have visited rules or if our
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// parent has visited values.
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let visited_values = if inputs.has_visited_rules() || parent_style.get_visited_style().is_some() {
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// Slightly annoying: we know that inputs has either rules or
|
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// visited rules, but we can't do inputs.rules() up front because
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// maybe it just has visited rules, so can't unwrap_or.
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let rule_node = match inputs.get_visited_rules() {
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Some(rules) => rules,
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None => inputs.rules()
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};
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// We want to use the visited bits (if any) from our parent style as
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// our parent.
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let mode = CascadeVisitedMode::Visited;
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let inherited_style = mode.values(parent_style);
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let computed =
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properties::cascade(&self.device,
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rule_node,
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guards,
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Some(inherited_style),
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Some(inherited_style),
|
||||
None,
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||||
None,
|
||||
&create_error_reporter(),
|
||||
font_metrics,
|
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CascadeFlags::empty(),
|
||||
self.quirks_mode);
|
||||
|
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Some(Arc::new(computed))
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} else {
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None
|
||||
};
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|
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// We may not have non-visited rules, if we only had visited ones. In
|
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// that case we want to use the root rulenode for our non-visited rules.
|
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let root;
|
||||
let rules = if let Some(rules) = inputs.get_rules() {
|
||||
rules
|
||||
} else {
|
||||
root = self.rule_tree.root();
|
||||
&root
|
||||
};
|
||||
|
||||
// Read the comment on `precomputed_values_for_pseudo` to see why it's
|
||||
// difficult to assert that display: contents nodes never arrive here
|
||||
// (tl;dr: It doesn't apply for replaced elements and such, but the
|
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// computed value is still "contents").
|
||||
// Bug 1364242: We need to add visited support for lazy pseudos
|
||||
let computed =
|
||||
properties::cascade(&self.device,
|
||||
rule_node,
|
||||
rules,
|
||||
guards,
|
||||
Some(parent_style),
|
||||
Some(parent_style),
|
||||
None,
|
||||
visited_values,
|
||||
None,
|
||||
&create_error_reporter(),
|
||||
font_metrics,
|
||||
|
@ -729,7 +773,7 @@ impl Stylist {
|
|||
Some(Arc::new(computed))
|
||||
}
|
||||
|
||||
/// Computes the rule node for a lazily-cascaded pseudo-element.
|
||||
/// Computes the cascade inputs for a lazily-cascaded pseudo-element.
|
||||
///
|
||||
/// See the documentation on lazy pseudo-elements in
|
||||
/// docs/components/style.md
|
||||
|
@ -737,14 +781,15 @@ impl Stylist {
|
|||
guards: &StylesheetGuards,
|
||||
element: &E,
|
||||
pseudo: &PseudoElement,
|
||||
is_probe: bool,
|
||||
rule_inclusion: RuleInclusion)
|
||||
-> Option<StrongRuleNode>
|
||||
-> CascadeInputs
|
||||
where E: TElement
|
||||
{
|
||||
let pseudo = pseudo.canonical();
|
||||
debug_assert!(pseudo.is_lazy());
|
||||
if self.pseudos_map.get(&pseudo).is_none() {
|
||||
return None
|
||||
return CascadeInputs::default()
|
||||
}
|
||||
|
||||
// Apply the selector flags. We should be in sequential mode
|
||||
|
@ -777,7 +822,7 @@ impl Stylist {
|
|||
}
|
||||
};
|
||||
|
||||
// Bug 1364242: We need to add visited support for lazy pseudos
|
||||
let mut inputs = CascadeInputs::default();
|
||||
let mut declarations = ApplicableDeclarationList::new();
|
||||
let mut matching_context =
|
||||
MatchingContext::new(MatchingMode::ForStatelessPseudoElement,
|
||||
|
@ -792,20 +837,53 @@ impl Stylist {
|
|||
&mut declarations,
|
||||
&mut matching_context,
|
||||
&mut set_selector_flags);
|
||||
if declarations.is_empty() {
|
||||
return None
|
||||
|
||||
if !declarations.is_empty() {
|
||||
let rule_node = self.rule_tree.insert_ordered_rules_with_important(
|
||||
declarations.into_iter().map(|a| a.order_and_level()),
|
||||
guards);
|
||||
if rule_node != self.rule_tree.root() {
|
||||
inputs.set_rules(VisitedHandlingMode::AllLinksUnvisited,
|
||||
rule_node);
|
||||
}
|
||||
};
|
||||
|
||||
if is_probe && !inputs.has_rules() {
|
||||
// When probing, don't compute visited styles if we have no
|
||||
// unvisited styles.
|
||||
return inputs;
|
||||
}
|
||||
|
||||
if matching_context.relevant_link_found {
|
||||
let mut declarations = ApplicableDeclarationList::new();
|
||||
let mut matching_context =
|
||||
MatchingContext::new_for_visited(MatchingMode::ForStatelessPseudoElement,
|
||||
None,
|
||||
VisitedHandlingMode::RelevantLinkVisited,
|
||||
self.quirks_mode);
|
||||
self.push_applicable_declarations(element,
|
||||
Some(&pseudo),
|
||||
None,
|
||||
None,
|
||||
AnimationRules(None, None),
|
||||
rule_inclusion,
|
||||
&mut declarations,
|
||||
&mut matching_context,
|
||||
&mut set_selector_flags);
|
||||
if !declarations.is_empty() {
|
||||
let rule_node =
|
||||
self.rule_tree.insert_ordered_rules_with_important(
|
||||
declarations.into_iter().map(|a| a.order_and_level()),
|
||||
guards);
|
||||
if rule_node == self.rule_tree.root() {
|
||||
None
|
||||
} else {
|
||||
Some(rule_node)
|
||||
if rule_node != self.rule_tree.root() {
|
||||
inputs.set_rules(VisitedHandlingMode::RelevantLinkVisited,
|
||||
rule_node);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
inputs
|
||||
}
|
||||
|
||||
/// Set a given device, which may change the styles that apply to the
|
||||
/// document.
|
||||
|
|
|
@ -10,7 +10,7 @@ use selectors::Element;
|
|||
use std::env;
|
||||
use std::fmt::Write;
|
||||
use std::ptr;
|
||||
use style::context::{QuirksMode, SharedStyleContext, StyleContext};
|
||||
use style::context::{CascadeInputs, QuirksMode, SharedStyleContext, StyleContext};
|
||||
use style::context::ThreadLocalStyleContext;
|
||||
use style::data::{ElementData, ElementStyles, RestyleData};
|
||||
use style::dom::{AnimationOnlyDirtyDescendants, DirtyDescendants};
|
||||
|
@ -1479,7 +1479,7 @@ pub extern "C" fn Servo_ResolvePseudoStyle(element: RawGeckoElementBorrowed,
|
|||
&pseudo,
|
||||
RuleInclusion::All,
|
||||
&data.styles,
|
||||
ComputedValues::arc_from_borrowed(&inherited_style).map(|v| v.as_ref()),
|
||||
ComputedValues::arc_from_borrowed(&inherited_style),
|
||||
&*doc_data,
|
||||
is_probe
|
||||
);
|
||||
|
@ -1533,7 +1533,7 @@ fn get_pseudo_style(
|
|||
pseudo: &PseudoElement,
|
||||
rule_inclusion: RuleInclusion,
|
||||
styles: &ElementStyles,
|
||||
inherited_styles: Option<&ComputedValues>,
|
||||
inherited_styles: Option<&Arc<ComputedValues>>,
|
||||
doc_data: &PerDocumentStyleDataImpl,
|
||||
is_probe: bool,
|
||||
) -> Option<Arc<ComputedValues>> {
|
||||
|
@ -1550,20 +1550,20 @@ fn get_pseudo_style(
|
|||
inherited_styles.unwrap_or(styles.primary());
|
||||
let guards = StylesheetGuards::same(guard);
|
||||
let metrics = get_metrics_provider_for_product();
|
||||
let rule_node = match styles.pseudos.get(&pseudo) {
|
||||
Some(styles) => styles.rules.as_ref(),
|
||||
None => None,
|
||||
let inputs = match styles.pseudos.get(&pseudo) {
|
||||
Some(styles) => CascadeInputs::new_from_style(styles),
|
||||
None => return None,
|
||||
};
|
||||
doc_data.stylist
|
||||
.compute_pseudo_element_style_with_rulenode(
|
||||
rule_node,
|
||||
.compute_pseudo_element_style_with_inputs(
|
||||
&inputs,
|
||||
&guards,
|
||||
inherited_styles,
|
||||
&metrics)
|
||||
},
|
||||
_ => {
|
||||
debug_assert!(inherited_styles.is_none() ||
|
||||
ptr::eq(inherited_styles.unwrap(),
|
||||
ptr::eq(&**inherited_styles.unwrap(),
|
||||
&**styles.primary()));
|
||||
styles.pseudos.get(&pseudo).cloned()
|
||||
},
|
||||
|
@ -1572,7 +1572,7 @@ fn get_pseudo_style(
|
|||
PseudoElementCascadeType::Precomputed => unreachable!("No anonymous boxes"),
|
||||
PseudoElementCascadeType::Lazy => {
|
||||
debug_assert!(inherited_styles.is_none() ||
|
||||
ptr::eq(inherited_styles.unwrap(),
|
||||
ptr::eq(&**inherited_styles.unwrap(),
|
||||
&**styles.primary()));
|
||||
let base = if pseudo.inherits_from_default_values() {
|
||||
doc_data.default_computed_values()
|
||||
|
@ -1588,6 +1588,7 @@ fn get_pseudo_style(
|
|||
&pseudo,
|
||||
rule_inclusion,
|
||||
base,
|
||||
is_probe,
|
||||
&metrics)
|
||||
},
|
||||
};
|
||||
|
|
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