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Auto merge of #19881 - jonleighton:issue-19811, r=emilio
Add layout RPC query for getting an element's style This enables us to implement Element::has_css_layout_box() in a more direct way, and also enables us to remove some of the existing more specific queries. Fixes #19811. r? @emilio <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/19881) <!-- Reviewable:end -->
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commit
2a46067587
10 changed files with 88 additions and 136 deletions
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@ -154,12 +154,13 @@ pub fn handle_get_layout(documents: &Documents,
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}
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fn determine_auto_margins(window: &Window, node: &Node) -> AutoMargins {
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let margin = window.margin_style_query(node.to_trusted_node_address());
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let style = window.style_query(node.to_trusted_node_address()).unwrap();
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let margin = style.get_margin();
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AutoMargins {
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top: margin.top == margin_top::computed_value::T::Auto,
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right: margin.right == margin_right::computed_value::T::Auto,
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bottom: margin.bottom == margin_bottom::computed_value::T::Auto,
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left: margin.left == margin_left::computed_value::T::Auto,
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top: margin.margin_top == margin_top::computed_value::T::Auto,
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right: margin.margin_right == margin_right::computed_value::T::Auto,
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bottom: margin.margin_bottom == margin_bottom::computed_value::T::Auto,
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left: margin.margin_left == margin_left::computed_value::T::Auto,
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}
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}
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@ -348,27 +348,24 @@ impl Element {
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}
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// https://drafts.csswg.org/cssom-view/#css-layout-box
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//
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// We'll have no content box if there's no fragment for the node, and we use
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// bounding_content_box, for simplicity, to detect this (rather than making a more specific
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// query to the layout thread).
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fn has_css_layout_box(&self) -> bool {
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self.upcast::<Node>().bounding_content_box().is_some()
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let style = self.upcast::<Node>().style();
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// style will be None for elements in a display: none subtree. otherwise, the element has a
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// layout box iff it doesn't have display: none.
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style.map_or(false, |s| !s.get_box().clone_display().is_none())
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}
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// https://drafts.csswg.org/cssom-view/#potentially-scrollable
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fn potentially_scrollable(&self) -> bool {
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self.has_css_layout_box() &&
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!self.overflow_x_is_visible() &&
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!self.overflow_y_is_visible()
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self.has_css_layout_box() && !self.has_any_visible_overflow()
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}
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// https://drafts.csswg.org/cssom-view/#scrolling-box
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fn has_scrolling_box(&self) -> bool {
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// TODO: scrolling mechanism, such as scrollbar (We don't have scrollbar yet)
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// self.has_scrolling_mechanism()
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self.overflow_x_is_hidden() ||
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self.overflow_y_is_hidden()
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self.has_any_hidden_overflow()
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}
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fn has_overflow(&self) -> bool {
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@ -376,32 +373,33 @@ impl Element {
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self.ScrollWidth() > self.ClientWidth()
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}
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// used value of overflow-x is "visible"
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fn overflow_x_is_visible(&self) -> bool {
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let window = window_from_node(self);
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let overflow_pair = window.overflow_query(self.upcast::<Node>().to_trusted_node_address());
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overflow_pair.x == overflow_x::computed_value::T::Visible
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// TODO: Once #19183 is closed (overflow-x/y types moved out of mako), then we could implement
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// a more generic `fn has_some_overflow(&self, overflow: Overflow)` rather than have
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// these two `has_any_{visible,hidden}_overflow` methods which are very structurally
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// similar.
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/// Computed value of overflow-x or overflow-y is "visible"
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fn has_any_visible_overflow(&self) -> bool {
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let style = self.upcast::<Node>().style();
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style.map_or(false, |s| {
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let box_ = s.get_box();
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box_.clone_overflow_x() == overflow_x::computed_value::T::Visible ||
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box_.clone_overflow_y() == overflow_y::computed_value::T::Visible
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})
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}
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// used value of overflow-y is "visible"
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fn overflow_y_is_visible(&self) -> bool {
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let window = window_from_node(self);
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let overflow_pair = window.overflow_query(self.upcast::<Node>().to_trusted_node_address());
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overflow_pair.y == overflow_y::computed_value::T::Visible
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}
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/// Computed value of overflow-x or overflow-y is "hidden"
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fn has_any_hidden_overflow(&self) -> bool {
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let style = self.upcast::<Node>().style();
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// used value of overflow-x is "hidden"
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fn overflow_x_is_hidden(&self) -> bool {
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let window = window_from_node(self);
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let overflow_pair = window.overflow_query(self.upcast::<Node>().to_trusted_node_address());
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overflow_pair.x == overflow_x::computed_value::T::Hidden
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}
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style.map_or(false, |s| {
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let box_ = s.get_box();
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// used value of overflow-y is "hidden"
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fn overflow_y_is_hidden(&self) -> bool {
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let window = window_from_node(self);
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let overflow_pair = window.overflow_query(self.upcast::<Node>().to_trusted_node_address());
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overflow_pair.y == overflow_y::computed_value::T::Hidden
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box_.clone_overflow_x() == overflow_x::computed_value::T::Hidden ||
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box_.clone_overflow_y() == overflow_y::computed_value::T::Hidden
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})
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}
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}
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@ -82,6 +82,7 @@ use std::mem;
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use std::ops::Range;
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use style::context::QuirksMode;
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use style::dom::OpaqueNode;
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use style::properties::ComputedValues;
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use style::selector_parser::{SelectorImpl, SelectorParser};
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use style::stylesheets::Stylesheet;
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use style::thread_state;
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@ -619,6 +620,10 @@ impl Node {
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window_from_node(self).client_rect_query(self.to_trusted_node_address())
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}
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pub fn style(&self) -> Option<Arc<ComputedValues>> {
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window_from_node(self).style_query(self.to_trusted_node_address())
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}
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// https://drafts.csswg.org/cssom-view/#dom-element-scrollwidth
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// https://drafts.csswg.org/cssom-view/#dom-element-scrollheight
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// https://drafts.csswg.org/cssom-view/#dom-element-scrolltop
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@ -72,8 +72,7 @@ use script_layout_interface::{TrustedNodeAddress, PendingImageState};
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use script_layout_interface::message::{Msg, Reflow, ReflowGoal, ScriptReflow};
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use script_layout_interface::reporter::CSSErrorReporter;
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use script_layout_interface::rpc::{ContentBoxResponse, ContentBoxesResponse, LayoutRPC};
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use script_layout_interface::rpc::{MarginStyleResponse, NodeScrollRootIdResponse};
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use script_layout_interface::rpc::{ResolvedStyleResponse, TextIndexResponse};
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use script_layout_interface::rpc::{NodeScrollRootIdResponse, ResolvedStyleResponse, TextIndexResponse};
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use script_runtime::{CommonScriptMsg, ScriptChan, ScriptPort, ScriptThreadEventCategory, Runtime};
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use script_thread::{ImageCacheMsg, MainThreadScriptChan, MainThreadScriptMsg};
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use script_thread::{ScriptThread, SendableMainThreadScriptChan};
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@ -82,6 +81,7 @@ use script_traits::{ScriptToConstellationChan, ScriptMsg, ScrollState, TimerEven
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use script_traits::{TimerSchedulerMsg, UntrustedNodeAddress, WindowSizeData, WindowSizeType};
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use script_traits::webdriver_msg::{WebDriverJSError, WebDriverJSResult};
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use selectors::attr::CaseSensitivity;
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use servo_arc;
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use servo_config::opts;
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use servo_config::prefs::PREFS;
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use servo_geometry::{f32_rect_to_au_rect, MaxRect};
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@ -102,8 +102,7 @@ use std::sync::mpsc::{Sender, channel};
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use std::sync::mpsc::TryRecvError::{Disconnected, Empty};
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use style::media_queries;
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use style::parser::ParserContext as CssParserContext;
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use style::properties::PropertyId;
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use style::properties::longhands::overflow_x;
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use style::properties::{ComputedValues, PropertyId};
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use style::selector_parser::PseudoElement;
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use style::str::HTML_SPACE_CHARACTERS;
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use style::stylesheets::CssRuleType;
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@ -1403,16 +1402,6 @@ impl Window {
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self.layout_rpc.node_scroll_area().client_rect
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}
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pub fn overflow_query(&self,
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node: TrustedNodeAddress) -> Point2D<overflow_x::computed_value::T> {
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// NB: This is only called if the document is fully active, and the only
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// reason to bail out from a query is if there's no viewport, so this
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// *must* issue a reflow.
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assert!(self.reflow(ReflowGoal::NodeOverflowQuery(node), ReflowReason::Query));
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self.layout_rpc.node_overflow().0.unwrap()
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}
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pub fn scroll_offset_query(&self, node: &Node) -> Vector2D<f32> {
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if let Some(scroll_offset) = self.scroll_offsets
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.borrow()
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@ -1477,11 +1466,11 @@ impl Window {
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(element, response.rect)
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}
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pub fn margin_style_query(&self, node: TrustedNodeAddress) -> MarginStyleResponse {
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if !self.reflow(ReflowGoal::MarginStyleQuery(node), ReflowReason::Query) {
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return MarginStyleResponse::empty();
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pub fn style_query(&self, node: TrustedNodeAddress) -> Option<servo_arc::Arc<ComputedValues>> {
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if !self.reflow(ReflowGoal::StyleQuery(node), ReflowReason::Query) {
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return None
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}
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self.layout_rpc.margin_style()
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self.layout_rpc.style().0
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}
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pub fn text_index_query(
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@ -1898,12 +1887,11 @@ fn debug_reflow_events(id: PipelineId, reflow_goal: &ReflowGoal, reason: &Reflow
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ReflowGoal::ContentBoxesQuery(_n) => "\tContentBoxesQuery",
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ReflowGoal::NodesFromPointQuery(..) => "\tNodesFromPointQuery",
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ReflowGoal::NodeGeometryQuery(_n) => "\tNodeGeometryQuery",
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ReflowGoal::NodeOverflowQuery(_n) => "\tNodeOverFlowQuery",
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ReflowGoal::NodeScrollGeometryQuery(_n) => "\tNodeScrollGeometryQuery",
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ReflowGoal::NodeScrollRootIdQuery(_n) => "\tNodeScrollRootIdQuery",
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ReflowGoal::ResolvedStyleQuery(_, _, _) => "\tResolvedStyleQuery",
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ReflowGoal::OffsetParentQuery(_n) => "\tOffsetParentQuery",
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ReflowGoal::MarginStyleQuery(_n) => "\tMarginStyleQuery",
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ReflowGoal::StyleQuery(_n) => "\tStyleQuery",
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ReflowGoal::TextIndexQuery(..) => "\tTextIndexQuery",
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ReflowGoal::TickAnimations => "\tTickAnimations",
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});
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