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Clean up BoxFragment display list builder in layout_2020

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This makes things a big easier to read and will make it easier to add
support for position:fixed.
This commit is contained in:
Martin Robinson 2020-02-07 14:35:05 +01:00
parent c67b3d71e2
commit 20b8edc625
1 changed files with 52 additions and 43 deletions
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95
components/layout_2020/display_list/mod.rs
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@ -244,51 +244,14 @@ impl<'a> BuilderForBoxFragment<'a> {
}
fn build(&mut self, builder: &mut DisplayListBuilder) {
let hit_info = hit_info(&self.fragment.style, self.fragment.tag, Cursor::Default);
if hit_info.is_some() {
let mut common = builder.common_properties(self.border_rect);
common.hit_info = hit_info;
if let Some(clip_id) = self.border_edge_clip(builder) {
common.clip_id = clip_id
}
builder.wr.push_hit_test(&common)
}
self.build_background(builder);
self.build_border(builder);
builder.clipping_and_scrolling_scope(|builder| {
let overflow_x = self.fragment.style.get_box().overflow_x;
let overflow_y = self.fragment.style.get_box().overflow_y;
let original_scroll_and_clip_info = builder.current_space_and_clip;
if overflow_x != ComputedOverflow::Visible || overflow_y != ComputedOverflow::Visible {
// TODO(mrobinson): We should use the correct fragment type, once we generate
// fragments from ::before and ::after generated content selectors.
let id = combine_id_with_fragment_type(
self.fragment.tag.id() as usize,
FragmentType::FragmentBody,
) as u64;
let external_id = wr::ExternalScrollId(id, builder.wr.pipeline_id);
self.build_hit_test(builder);
self.build_background(builder);
self.build_border(builder);
let sensitivity = if ComputedOverflow::Hidden == overflow_x &&
ComputedOverflow::Hidden == overflow_y
{
wr::ScrollSensitivity::Script
} else {
wr::ScrollSensitivity::ScriptAndInputEvents
};
builder.current_space_and_clip = builder.wr.define_scroll_frame(
&original_scroll_and_clip_info,
Some(external_id),
self.fragment.scrollable_overflow().to_webrender(),
*self.padding_rect(),
vec![], // complex_clips
None, // image_mask
sensitivity,
wr::units::LayoutVector2D::zero(),
);
}
// We want to build the scroll frame after the background and border, because
// they shouldn't scroll with the rest of the box content.
self.build_scroll_frame_if_necessary(builder);
let content_rect = self
.fragment
@ -301,6 +264,52 @@ impl<'a> BuilderForBoxFragment<'a> {
});
}
fn build_scroll_frame_if_necessary(&self, builder: &mut DisplayListBuilder) {
let overflow_x = self.fragment.style.get_box().overflow_x;
let overflow_y = self.fragment.style.get_box().overflow_y;
let original_scroll_and_clip_info = builder.current_space_and_clip;
if overflow_x != ComputedOverflow::Visible || overflow_y != ComputedOverflow::Visible {
// TODO(mrobinson): We should use the correct fragment type, once we generate
// fragments from ::before and ::after generated content selectors.
let id = combine_id_with_fragment_type(
self.fragment.tag.id() as usize,
FragmentType::FragmentBody,
) as u64;
let external_id = wr::ExternalScrollId(id, builder.wr.pipeline_id);
let sensitivity = if ComputedOverflow::Hidden == overflow_x &&
ComputedOverflow::Hidden == overflow_y
{
wr::ScrollSensitivity::Script
} else {
wr::ScrollSensitivity::ScriptAndInputEvents
};
builder.current_space_and_clip = builder.wr.define_scroll_frame(
&original_scroll_and_clip_info,
Some(external_id),
self.fragment.scrollable_overflow().to_webrender(),
*self.padding_rect(),
vec![], // complex_clips
None, // image_mask
sensitivity,
wr::units::LayoutVector2D::zero(),
);
}
}
fn build_hit_test(&self, builder: &mut DisplayListBuilder) {
let hit_info = hit_info(&self.fragment.style, self.fragment.tag, Cursor::Default);
if hit_info.is_some() {
let mut common = builder.common_properties(self.border_rect);
common.hit_info = hit_info;
if let Some(clip_id) = self.border_edge_clip(builder) {
common.clip_id = clip_id
}
builder.wr.push_hit_test(&common)
}
}
fn build_background(&mut self, builder: &mut DisplayListBuilder) {
use style::values::computed::image::{Image, ImageLayer};
let b = self.fragment.style.get_background();