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layout_2020: Add 'establishes_block_formatting_context' method to 'ComputedValuesExt'
This method checks whether the style of a normal block would establish a block formatting context.
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1 changed files with 21 additions and 0 deletions
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@ -11,6 +11,7 @@ use style::computed_values::transform_style::T as ComputedTransformStyle;
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use style::logical_geometry::WritingMode;
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use style::properties::longhands::backface_visibility::computed_value::T as BackfaceVisiblity;
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use style::properties::longhands::box_sizing::computed_value::T as BoxSizing;
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use style::properties::longhands::column_span::computed_value::T as ColumnSpan;
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use style::properties::ComputedValues;
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use style::values::computed::image::Image as ComputedImageLayer;
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use style::values::computed::{Length, LengthPercentage};
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@ -112,6 +113,7 @@ pub(crate) trait ComputedValuesExt {
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) -> flow_relative::Sides<LengthPercentageOrAuto<'_>>;
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fn has_transform_or_perspective(&self) -> bool;
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fn effective_z_index(&self) -> i32;
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fn establishes_block_formatting_context(&self) -> bool;
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fn establishes_stacking_context(&self) -> bool;
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fn establishes_containing_block_for_absolute_descendants(&self) -> bool;
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fn establishes_containing_block_for_all_descendants(&self) -> bool;
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@ -365,6 +367,25 @@ impl ComputedValuesExt for ComputedValues {
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}
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}
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/// Return true if this style is a normal block and establishes
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/// a new block formatting context.
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fn establishes_block_formatting_context(&self) -> bool {
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if self.get_box().overflow_x.is_scrollable() {
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return true;
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}
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if self.get_column().is_multicol() {
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return true;
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}
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if self.get_column().column_span == ColumnSpan::All {
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return true;
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}
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// TODO: We need to handle CSS Contain here.
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false
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}
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/// Returns true if this fragment establishes a new stacking context and false otherwise.
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fn establishes_stacking_context(&self) -> bool {
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let effects = self.get_effects();
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