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a3add2e504
Source-Repo: https://github.com/servo/servo Source-Revision: 294f44eca03eff39ceb252b32b3412fa67a9d8b0 --HG-- extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear extra : subtree_revision : 9d9ee1a9715e5a130cb46cce80bf8a611d784ced
119 lines
4.1 KiB
Rust
119 lines
4.1 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! Helper types for the `@viewport` rule.
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use {CSSPixel, PinchZoomFactor};
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use cssparser::{Parser, ToCss};
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use euclid::size::TypedSize2D;
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use std::ascii::AsciiExt;
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use std::fmt;
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use values::specified::AllowedLengthType;
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define_css_keyword_enum!(UserZoom:
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"zoom" => Zoom,
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"fixed" => Fixed);
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define_css_keyword_enum!(Orientation:
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"auto" => Auto,
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"portrait" => Portrait,
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"landscape" => Landscape);
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/// A set of viewport descriptors:
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///
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/// https://drafts.csswg.org/css-device-adapt/#viewport-desc
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#[derive(Clone, Debug, PartialEq)]
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#[cfg_attr(feature = "servo", derive(Deserialize, Serialize, HeapSizeOf))]
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pub struct ViewportConstraints {
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/// Width and height:
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/// * https://drafts.csswg.org/css-device-adapt/#width-desc
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/// * https://drafts.csswg.org/css-device-adapt/#height-desc
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pub size: TypedSize2D<f32, CSSPixel>,
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/// https://drafts.csswg.org/css-device-adapt/#zoom-desc
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pub initial_zoom: PinchZoomFactor,
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/// https://drafts.csswg.org/css-device-adapt/#min-max-width-desc
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pub min_zoom: Option<PinchZoomFactor>,
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/// https://drafts.csswg.org/css-device-adapt/#min-max-width-desc
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pub max_zoom: Option<PinchZoomFactor>,
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/// https://drafts.csswg.org/css-device-adapt/#user-zoom-desc
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pub user_zoom: UserZoom,
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/// https://drafts.csswg.org/css-device-adapt/#orientation-desc
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pub orientation: Orientation
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}
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impl ToCss for ViewportConstraints {
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fn to_css<W>(&self, dest: &mut W) -> fmt::Result
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where W: fmt::Write
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{
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try!(write!(dest, "@viewport {{"));
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try!(write!(dest, " width: {}px;", self.size.width));
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try!(write!(dest, " height: {}px;", self.size.height));
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try!(write!(dest, " zoom: {};", self.initial_zoom.get()));
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if let Some(min_zoom) = self.min_zoom {
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try!(write!(dest, " min-zoom: {};", min_zoom.get()));
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}
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if let Some(max_zoom) = self.max_zoom {
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try!(write!(dest, " max-zoom: {};", max_zoom.get()));
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}
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try!(write!(dest, " user-zoom: ")); try!(self.user_zoom.to_css(dest));
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try!(write!(dest, "; orientation: ")); try!(self.orientation.to_css(dest));
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write!(dest, "; }}")
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}
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}
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/// https://drafts.csswg.org/css-device-adapt/#descdef-viewport-zoom
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#[derive(Copy, Clone, Debug, PartialEq)]
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#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
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pub enum Zoom {
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/// A number value.
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Number(f32),
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/// A percentage value.
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Percentage(f32),
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/// The `auto` keyword.
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Auto,
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}
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impl ToCss for Zoom {
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fn to_css<W>(&self, dest: &mut W) -> fmt::Result
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where W: fmt::Write,
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{
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match *self {
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Zoom::Number(number) => write!(dest, "{}", number),
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Zoom::Percentage(percentage) => write!(dest, "{}%", percentage * 100.),
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Zoom::Auto => write!(dest, "auto")
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}
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}
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}
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impl Zoom {
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/// Parse a zoom value per:
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///
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/// https://drafts.csswg.org/css-device-adapt/#descdef-viewport-zoom
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pub fn parse(input: &mut Parser) -> Result<Zoom, ()> {
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use cssparser::Token;
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match try!(input.next()) {
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Token::Percentage(ref value) if AllowedLengthType::NonNegative.is_ok(value.unit_value) =>
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Ok(Zoom::Percentage(value.unit_value)),
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Token::Number(ref value) if AllowedLengthType::NonNegative.is_ok(value.value) =>
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Ok(Zoom::Number(value.value)),
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Token::Ident(ref value) if value.eq_ignore_ascii_case("auto") =>
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Ok(Zoom::Auto),
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_ => Err(())
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}
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}
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/// Get this zoom value as a float value. Returns `None` if the value is the
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/// `auto` keyword.
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#[inline]
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pub fn to_f32(&self) -> Option<f32> {
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match *self {
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Zoom::Number(number) => Some(number as f32),
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Zoom::Percentage(percentage) => Some(percentage as f32),
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Zoom::Auto => None
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}
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}
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}
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