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Refactor Position

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A specified position is now a struct made of two values of different types,
the first one being PositionComponent<X>, and the second one PositionComponent<Y>.

A position component is represented by the new enum PositionComponent<Side>,
with the three values Center, Length(LengthOrPercentage), and
Side(Side, Option<LengthOrPercentage>).

Side keywords are represented by the X and Y enums, which don't include a value
for the center keyword anymore. They are accompanied by the Side trait, which
allows us to determine whether a side keyword is "left" or "top".

This refactor simplified the parsing and serialisation code and exposed bugs in it,
where it would reject valid <position> values followed by arbitrary tokens,
and where it would fail to prefer "left" to "right" when serialising positions
in basic shapes.
This commit is contained in:
Anthony Ramine 2017-05-08 03:09:26 +02:00
parent 0040160b38
commit 70ec61cf01
22 changed files with 484 additions and 887 deletions
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8
components/layout/display_list_builder.rs
View file

@ -1008,9 +1008,9 @@ impl FragmentDisplayListBuilding for Fragment {
let horiz_position = *get_cyclic(&background.background_position_x.0, index);
let vert_position = *get_cyclic(&background.background_position_y.0, index);
// Use `background-position` to get the offset.
let horizontal_position = model::specified(horiz_position.0,
let horizontal_position = model::specified(horiz_position,
bounds.size.width - image_size.width);
let vertical_position = model::specified(vert_position.0,
let vertical_position = model::specified(vert_position,
bounds.size.height - image_size.height);
// The anchor position for this background, based on both the background-attachment
@ -1167,8 +1167,8 @@ impl FragmentDisplayListBuilding for Fragment {
repeating: bool,
style: &ServoComputedValues)
-> display_list::RadialGradient {
let center = Point2D::new(specified(center.horizontal.0, bounds.size.width),
specified(center.vertical.0, bounds.size.height));
let center = Point2D::new(specified(center.horizontal, bounds.size.width),
specified(center.vertical, bounds.size.height));
let radius = match *shape {
EndingShape::Circle(LengthOrKeyword::Length(length))
=> Size2D::new(length, length),