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Use WebRender to compute text index on click events

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This is the second half of switching over to WebRender for hit testing.
Now that WebRender gives us the location of the hit tested point in the
display item, we can use that to calculate text index.
This commit is contained in:
Martin Robinson 2017-09-30 15:50:47 +02:00
parent ca08271345
commit 770b348091
11 changed files with 191 additions and 276 deletions
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137
components/gfx/display_list/mod.rs
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@ -48,74 +48,6 @@ pub struct DisplayList {
pub list: Vec<DisplayItem>,
}
struct ScrollOffsetLookup<'a> {
parents: &'a mut HashMap<ClipId, ClipId>,
calculated_total_offsets: ScrollOffsetMap,
raw_offsets: &'a ScrollOffsetMap,
}
impl<'a> ScrollOffsetLookup<'a> {
fn new(parents: &'a mut HashMap<ClipId, ClipId>,
raw_offsets: &'a ScrollOffsetMap)
-> ScrollOffsetLookup<'a> {
ScrollOffsetLookup {
parents: parents,
calculated_total_offsets: HashMap::new(),
raw_offsets: raw_offsets,
}
}
fn new_for_reference_frame(&mut self,
clip_id: ClipId,
transform: &Transform3D<f32>,
point: &mut Point2D<Au>)
-> Option<ScrollOffsetLookup> {
// If a transform function causes the current transformation matrix of an object
// to be non-invertible, the object and its content do not get displayed.
let inv_transform = match transform.inverse() {
Some(transform) => transform,
None => return None,
};
let scroll_offset = self.full_offset_for_clip_scroll_node(&clip_id);
*point = Point2D::new(point.x - Au::from_f32_px(scroll_offset.x),
point.y - Au::from_f32_px(scroll_offset.y));
let frac_point = inv_transform.transform_point2d(&Point2D::new(point.x.to_f32_px(),
point.y.to_f32_px()));
*point = Point2D::new(Au::from_f32_px(frac_point.x), Au::from_f32_px(frac_point.y));
let mut sublookup = ScrollOffsetLookup {
parents: &mut self.parents,
calculated_total_offsets: HashMap::new(),
raw_offsets: self.raw_offsets,
};
sublookup.calculated_total_offsets.insert(clip_id, Vector2D::zero());
Some(sublookup)
}
fn add_clip_scroll_node(&mut self, clip_scroll_node: &ClipScrollNode) {
self.parents.insert(clip_scroll_node.id, clip_scroll_node.parent_id);
}
fn full_offset_for_clip_scroll_node(&mut self, id: &ClipId) -> Vector2D<f32> {
if let Some(offset) = self.calculated_total_offsets.get(id) {
return *offset;
}
let parent_offset = if !id.is_root_scroll_node() {
let parent_id = *self.parents.get(id).unwrap();
self.full_offset_for_clip_scroll_node(&parent_id)
} else {
Vector2D::zero()
};
let offset = parent_offset +
self.raw_offsets.get(id).cloned().unwrap_or_else(Vector2D::zero);
self.calculated_total_offsets.insert(*id, offset);
offset
}
}
impl DisplayList {
/// Return the bounds of this display list based on the dimensions of the root
/// stacking context.
@ -128,82 +60,23 @@ impl DisplayList {
}
// Returns the text index within a node for the point of interest.
pub fn text_index(&self,
node: OpaqueNode,
client_point: &Point2D<Au>,
scroll_offsets: &ScrollOffsetMap)
-> Option<usize> {
let mut result = Vec::new();
pub fn text_index(&self, node: OpaqueNode, point_in_item: &Point2D<Au>) -> Option<usize> {
let mut traversal = DisplayListTraversal::new(self);
self.text_index_contents(node,
&mut traversal,
client_point,
&mut ScrollOffsetLookup::new(&mut HashMap::new(), scroll_offsets),
&mut result);
result.pop()
}
fn text_index_contents<'a>(&self,
node: OpaqueNode,
traversal: &mut DisplayListTraversal<'a>,
point: &Point2D<Au>,
offset_lookup: &mut ScrollOffsetLookup,
result: &mut Vec<usize>) {
while let Some(item) = traversal.next() {
match item {
&DisplayItem::PushStackingContext(ref context_item) => {
self.text_index_stacking_context(&context_item.stacking_context,
item.scroll_node_id(),
node,
traversal,
point,
offset_lookup,
result);
}
&DisplayItem::DefineClipScrollNode(ref item) => {
offset_lookup.add_clip_scroll_node(&item.node);
}
&DisplayItem::PopStackingContext(_) => return,
&DisplayItem::Text(ref text) => {
let base = item.base();
if base.metadata.node == node {
let offset = *point - text.baseline_origin;
let index = text.text_run.range_index_of_advance(&text.range, offset.x);
result.push(index);
let point = *point_in_item + item.base().bounds.origin.to_vector();
let offset = point - text.baseline_origin;
return Some(text.text_run.range_index_of_advance(&text.range, offset.x));
}
},
_ => {},
}
}
}
fn text_index_stacking_context<'a>(&self,
stacking_context: &StackingContext,
clip_id: ClipId,
node: OpaqueNode,
traversal: &mut DisplayListTraversal<'a>,
point: &Point2D<Au>,
offset_lookup: &mut ScrollOffsetLookup,
result: &mut Vec<usize>) {
let mut point = *point - stacking_context.bounds.origin.to_vector();
if stacking_context.scroll_policy == ScrollPolicy::Fixed {
let old_offset = offset_lookup.calculated_total_offsets.get(&clip_id).cloned();
offset_lookup.calculated_total_offsets.insert(clip_id, Vector2D::zero());
self.text_index_contents(node, traversal, &point, offset_lookup, result);
match old_offset {
Some(offset) => offset_lookup.calculated_total_offsets.insert(clip_id, offset),
None => offset_lookup.calculated_total_offsets.remove(&clip_id),
};
} else if let Some(transform) = stacking_context.transform {
if let Some(ref mut sublookup) =
offset_lookup.new_for_reference_frame(clip_id, &transform, &mut point) {
self.text_index_contents(node, traversal, &point, sublookup, result);
}
} else {
self.text_index_contents(node, traversal, &point, offset_lookup, result);
}
None
}
pub fn print(&self) {