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layout: Implement z-index
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eff0de0ce1
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9 changed files with 81 additions and 18 deletions
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@ -1239,11 +1239,10 @@ impl BlockFlow {
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if !self.base.absolute_position_info.layers_needed_for_positioned_flows &&
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!self.base.flags.needs_layer() {
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// We didn't need a layer.
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//
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// TODO(#781, pcwalton): `z-index`.
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self.base.display_list =
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mem::replace(&mut self.base.display_list,
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DisplayList::new()).flatten(PositionedDescendantStackingLevel(0));
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let z_index = self.fragment.style().get_box().z_index.number_or_zero();
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let level = PositionedDescendantStackingLevel(z_index);
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self.base.display_list = mem::replace(&mut self.base.display_list,
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DisplayList::new()).flatten(level);
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return
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}
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@ -330,12 +330,17 @@ impl<'a> FlowConstructor<'a> {
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{
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let inline_flow = inline_flow_ref.get_mut().as_inline();
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// We must scan for runs before computing minimum ascent and descent because scanning
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// for runs might collapse so much whitespace away that only hypothetical fragments
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// remain. In that case the inline flow will compute its ascent and descent to be zero.
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TextRunScanner::new().scan_for_runs(self.layout_context.font_context(), inline_flow);
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let (ascent, descent) =
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inline_flow.compute_minimum_ascent_and_descent(self.layout_context.font_context(),
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&**node.style());
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inline_flow.minimum_block_size_above_baseline = ascent;
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inline_flow.minimum_depth_below_baseline = descent;
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TextRunScanner::new().scan_for_runs(self.layout_context.font_context(), inline_flow);
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}
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inline_flow_ref.finish(self.layout_context);
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@ -1701,13 +1701,13 @@ impl Fragment {
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&font_style);
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InlineMetrics::from_block_height(&font_metrics, block_flow.base.position.size.block)
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}
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InlineAbsoluteHypotheticalFragment(ref info) => {
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// See CSS 2.1 § 10.8.1.
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let block_flow = info.flow_ref.get().as_immutable_block();
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let font_style = text::computed_style_to_font_style(&*self.style);
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let font_metrics = text::font_metrics_for_style(layout_context.font_context(),
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&font_style);
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InlineMetrics::from_block_height(&font_metrics, block_flow.base.position.size.block)
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InlineAbsoluteHypotheticalFragment(_) => {
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// Hypothetical boxes take up no space.
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InlineMetrics {
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block_size_above_baseline: Au(0),
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depth_below_baseline: Au(0),
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ascent: Au(0),
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}
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}
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_ => {
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InlineMetrics {
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@ -1719,6 +1719,14 @@ impl Fragment {
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}
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}
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/// Returns true if this fragment is a hypothetical box. See CSS 2.1 § 10.3.7.
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pub fn is_hypothetical(&self) -> bool {
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match self.specific {
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InlineAbsoluteHypotheticalFragment(_) => true,
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_ => false,
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}
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}
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/// Returns true if this fragment can merge with another adjacent fragment or false otherwise.
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pub fn can_merge_with_fragment(&self, other: &Fragment) -> bool {
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match (&self.specific, &other.specific) {
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@ -943,7 +943,14 @@ impl InlineFlow {
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/// `style` is the style of the block.
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pub fn compute_minimum_ascent_and_descent(&self,
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font_context: &mut FontContext,
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style: &ComputedValues) -> (Au, Au) {
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style: &ComputedValues)
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-> (Au, Au) {
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// As a special case, if this flow contains only hypothetical fragments, then the entire
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// flow is hypothetical and takes up no space. See CSS 2.1 § 10.3.7.
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if self.fragments.fragments.iter().all(|fragment| fragment.is_hypothetical()) {
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return (Au(0), Au(0))
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}
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let font_style = text::computed_style_to_font_style(style);
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let font_metrics = text::font_metrics_for_style(font_context, &font_style);
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let line_height = text::line_height_from_style(style, &font_metrics);
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@ -800,6 +800,9 @@ impl LayoutTask {
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if self.opts.trace_layout {
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layout_debug::begin_trace(layout_root.clone());
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}
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if self.opts.dump_flow_tree {
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layout_root.get_mut().dump();
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}
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// Propagate damage.
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profile(time::LayoutDamagePropagateCategory, Some((&data.url, data.iframe, self.first_reflow.get())),
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