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layout: Implement overflow-x and overflow-y per CSS-OVERFLOW § 3.

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This commit is contained in:
Patrick Walton 2015-01-07 16:05:10 -08:00 • committed by Simon Sapin
parent 417a932e30
commit a82fc00806
9 changed files with 199 additions and 17 deletions
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39
components/layout/display_list_builder.rs
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@ -41,6 +41,7 @@ use servo_util::cursor::Cursor;
use servo_util::geometry::{self, Au, ZERO_POINT, to_px, to_frac_px};
use servo_util::logical_geometry::{LogicalPoint, LogicalRect, LogicalSize};
use servo_util::opts;
use std::cmp;
use std::default::Default;
use std::iter::repeat;
use std::num::Float;
@ -48,7 +49,7 @@ use style::values::specified::{AngleOrCorner, HorizontalDirection, VerticalDirec
use style::values::computed::{Image, LinearGradient, LengthOrPercentage};
use style::values::RGBA;
use style::computed_values::filter::Filter;
use style::computed_values::{background_attachment, background_repeat, border_style, overflow};
use style::computed_values::{background_attachment, background_repeat, border_style, overflow_x};
use style::computed_values::{position, visibility};
use style::properties::style_structs::Border;
use style::properties::ComputedValues;
@ -990,17 +991,37 @@ impl FragmentDisplayListBuilding for Fragment {
}
// Account for style-specified `clip`.
let current_clip = self.calculate_style_specified_clip(current_clip,
stacking_relative_border_box);
let mut current_clip = self.calculate_style_specified_clip(current_clip,
stacking_relative_border_box);
// Only clip if `overflow` tells us to.
match self.style.get_box().overflow {
overflow::T::hidden | overflow::T::auto | overflow::T::scroll => {
// Create a new clip rect.
current_clip.intersect_rect(stacking_relative_border_box)
// Clip according to the values of `overflow-x` and `overflow-y`.
//
// TODO(pcwalton): Support scrolling.
// FIXME(pcwalton): This may be more complex than it needs to be, since it seems to be
// impossible with the computed value rules as they are to have `overflow-x: visible` with
// `overflow-y: <scrolling>` or vice versa!
match self.style.get_box().overflow_x {
overflow_x::T::hidden | overflow_x::T::auto | overflow_x::T::scroll => {
let mut bounds = current_clip.bounding_rect();
let max_x = cmp::min(bounds.max_x(), stacking_relative_border_box.max_x());
bounds.origin.x = cmp::max(bounds.origin.x, stacking_relative_border_box.origin.x);
bounds.size.width = max_x - bounds.origin.x;
current_clip = current_clip.intersect_rect(&bounds)
}
_ => current_clip,
_ => {}
}
match self.style.get_box().overflow_y.0 {
overflow_x::T::hidden | overflow_x::T::auto | overflow_x::T::scroll => {
let mut bounds = current_clip.bounding_rect();
let max_y = cmp::min(bounds.max_y(), stacking_relative_border_box.max_y());
bounds.origin.y = cmp::max(bounds.origin.y, stacking_relative_border_box.origin.y);
bounds.size.height = max_y - bounds.origin.y;
current_clip = current_clip.intersect_rect(&bounds)
}
_ => {}
}
current_clip
}
fn build_display_list_for_text_fragment(&self,