Mirrors/servo
1
0
Fork 0
mirror of https://github.com/servo/servo.git synced 2025-08-07 22:45:34 +01:00
Code Issues Projects Releases Packages Wiki Activity

style: Make media queries and viewport units in print be evaluated against the default page size minus margins.

Browse source 
For that, move the default page margin computation to nsPresContext.

See https://github.com/w3c/csswg-drafts/issues/5437 as to why doing this
and other alternatives.

Differential Revision: https://phabricator.services.mozilla.com/D87311
This commit is contained in:
Emilio Cobos Álvarez 2020-08-19 10:32:16 +00:00
parent 9fd3d9a5e9
commit c200b67395
2 changed files with 27 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

25
components/style/gecko/media_queries.rs
View file

@ -19,7 +19,7 @@ use cssparser::RGBA;
use euclid::default::Size2D;
use euclid::{Scale, SideOffsets2D};
use servo_arc::Arc;
use std::fmt;
use std::{cmp, fmt};
use std::sync::atomic::{AtomicBool, AtomicU32, AtomicUsize, Ordering};
use style_traits::viewport::ViewportConstraints;
use style_traits::{CSSPixel, DevicePixel};
@ -223,12 +223,29 @@ impl Device {
MediaType(CustomIdent(unsafe { Atom::from_raw(medium_to_use) }))
}
// It may make sense to account for @page rule margins here somehow, however
// it's not clear how that'd work, see:
// https://github.com/w3c/csswg-drafts/issues/5437
fn page_size_minus_default_margin(&self, pc: &structs::nsPresContext) -> Size2D<Au> {
debug_assert!(pc.mIsRootPaginatedDocument() != 0);
let area = &pc.mPageSize;
let margin = &pc.mDefaultPageMargin;
let width = area.width - margin.left - margin.right;
let height = area.height - margin.top - margin.bottom;
Size2D::new(Au(cmp::max(width, 0)), Au(cmp::max(height, 0)))
}
/// Returns the current viewport size in app units.
pub fn au_viewport_size(&self) -> Size2D<Au> {
let pc = match self.pres_context() {
Some(pc) => pc,
None => return Size2D::new(Au(0), Au(0)),
};
if pc.mIsRootPaginatedDocument() != 0 {
return self.page_size_minus_default_margin(pc);
}
let area = &pc.mVisibleArea;
Size2D::new(Au(area.width), Au(area.height))
}
@ -237,11 +254,15 @@ impl Device {
/// used for viewport unit resolution.
pub fn au_viewport_size_for_viewport_unit_resolution(&self) -> Size2D<Au> {
self.used_viewport_size.store(true, Ordering::Relaxed);
let pc = match self.pres_context() {
Some(pc) => pc,
None => return Size2D::new(Au(0), Au(0)),
};
if pc.mIsRootPaginatedDocument() != 0 {
return self.page_size_minus_default_margin(pc)
}
let size = &pc.mSizeForViewportUnits;
Size2D::new(Au(size.width), Au(size.height))
}