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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use std::fmt;
use std::sync::Arc;
use style::ComputedValues;
bitflags! {
#[doc = "Individual layout actions that may be necessary after restyling."]
flags RestyleDamage: int {
#[doc = "Repaint the node itself."]
#[doc = "Currently unused; need to decide how this propagates."]
static Repaint = 0x01,
#[doc = "Recompute intrinsic inline_sizes (minimum and preferred)."]
#[doc = "Propagates down the flow tree because the computation is"]
#[doc = "bottom-up."]
static BubbleISizes = 0x02,
#[doc = "Recompute actual inline_sizes and block_sizes."]
#[doc = "Propagates up the flow tree because the computation is"]
#[doc = "top-down."]
static Reflow = 0x04
}
}
impl RestyleDamage {
/// Elements of self which should also get set on any ancestor flow.
pub fn propagate_up(self) -> RestyleDamage {
self & Reflow
}
/// Elements of self which should also get set on any child flows.
pub fn propagate_down(self) -> RestyleDamage {
self & BubbleISizes
}
}
impl fmt::Show for RestyleDamage {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::FormatError> {
let mut first_elem = true;
let to_iter =
[ (Repaint, "Repaint")
, (BubbleISizes, "BubbleISizes")
, (Reflow, "Reflow")
];
for &(damage, damage_str) in to_iter.iter() {
if self.contains(damage) {
if !first_elem { try!(write!(f, " | ")); }
try!(write!(f, "{}", damage_str));
first_elem = false;
}
}
if first_elem {
try!(write!(f, "NoDamage"));
}
Ok(())
}
}
// NB: We need the braces inside the RHS due to Rust #8012. This particular
// version of this macro might be safe anyway, but we want to avoid silent
// breakage on modifications.
macro_rules! add_if_not_equal(
($old:ident, $new:ident, $damage:ident,
[ $($effect:ident),* ], [ $($style_struct_getter:ident.$name:ident),* ]) => ({
if $( ($old.$style_struct_getter().$name != $new.$style_struct_getter().$name) )||* {
$damage.insert($($effect)|*);
}
})
)
pub fn compute_damage(old: &Option<Arc<ComputedValues>>, new: &ComputedValues) -> RestyleDamage {
let old: &ComputedValues =
match old.as_ref() {
None => return Repaint | BubbleISizes | Reflow,
Some(cv) => &**cv,
};
let mut damage = RestyleDamage::empty();
// This checks every CSS property, as enumerated in
// impl<'self> CssComputedStyle<'self>
// in src/support/netsurfcss/rust-netsurfcss/netsurfcss.rc.
// FIXME: We can short-circuit more of this.
add_if_not_equal!(old, new, damage, [ Repaint ],
[ get_color.color, get_background.background_color,
get_border.border_top_color, get_border.border_right_color,
get_border.border_bottom_color, get_border.border_left_color ]);
add_if_not_equal!(old, new, damage, [ Repaint, BubbleISizes, Reflow ],
[ get_border.border_top_width, get_border.border_right_width,
get_border.border_bottom_width, get_border.border_left_width,
get_margin.margin_top, get_margin.margin_right,
get_margin.margin_bottom, get_margin.margin_left,
get_padding.padding_top, get_padding.padding_right,
get_padding.padding_bottom, get_padding.padding_left,
get_box.position, get_box.width, get_box.height, get_box.float, get_box.display,
get_font.font_family, get_font.font_size, get_font.font_style, get_font.font_weight,
get_inheritedtext.text_align, get_text.text_decoration, get_inheritedbox.line_height ]);
// FIXME: test somehow that we checked every CSS property
damage
}
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