Change StyleSet to track stylesheets by unique ID.

MozReview-Commit-ID: Ky3P53o4Euw
This commit is contained in:
Brad Werth 2017-04-27 12:13:44 -07:00 committed by Brad Werth
parent 32f4273e38
commit 2b6c494f85
4 changed files with 62 additions and 37 deletions

View file

@ -4,19 +4,26 @@
//! A centralized set of stylesheets for a document.
use arc_ptr_eq;
use std::sync::Arc;
use stylesheets::Stylesheet;
/// Entry for a StylesheetSet. We don't bother creating a constructor, because
/// there's no sensible defaults for the member variables.
pub struct StylesheetSetEntry {
unique_id: u32,
sheet: Arc<Stylesheet>,
}
/// The set of stylesheets effective for a given document.
pub struct StylesheetSet {
/// The actual list of all the stylesheets that apply to the given document.
/// The actual list of all the stylesheets that apply to the given document,
/// each stylesheet associated with a unique ID.
///
/// This is only a list of top-level stylesheets, and as such it doesn't
/// include recursive `@import` rules.
stylesheets: Vec<Arc<Stylesheet>>,
entries: Vec<StylesheetSetEntry>,
/// Whether the stylesheets list above has changed since the last restyle.
/// Whether the entries list above has changed since the last restyle.
dirty: bool,
/// Has author style been disabled?
@ -27,7 +34,7 @@ impl StylesheetSet {
/// Create a new empty StylesheetSet.
pub fn new() -> Self {
StylesheetSet {
stylesheets: vec![],
entries: vec![],
dirty: false,
author_style_disabled: false,
}
@ -39,39 +46,51 @@ impl StylesheetSet {
self.author_style_disabled
}
fn remove_stylesheet_if_present(&mut self, sheet: &Arc<Stylesheet>) {
self.stylesheets.retain(|x| !arc_ptr_eq(x, sheet));
fn remove_stylesheet_if_present(&mut self, unique_id: u32) {
self.entries.retain(|x| x.unique_id != unique_id);
}
/// Appends a new stylesheet to the current set.
pub fn append_stylesheet(&mut self, sheet: &Arc<Stylesheet>) {
self.remove_stylesheet_if_present(sheet);
self.stylesheets.push(sheet.clone());
pub fn append_stylesheet(&mut self, sheet: &Arc<Stylesheet>,
unique_id: u32) {
self.remove_stylesheet_if_present(unique_id);
self.entries.push(StylesheetSetEntry {
unique_id: unique_id,
sheet: sheet.clone(),
});
self.dirty = true;
}
/// Prepend a new stylesheet to the current set.
pub fn prepend_stylesheet(&mut self, sheet: &Arc<Stylesheet>) {
self.remove_stylesheet_if_present(sheet);
self.stylesheets.insert(0, sheet.clone());
pub fn prepend_stylesheet(&mut self, sheet: &Arc<Stylesheet>,
unique_id: u32) {
self.remove_stylesheet_if_present(unique_id);
self.entries.insert(0, StylesheetSetEntry {
unique_id: unique_id,
sheet: sheet.clone(),
});
self.dirty = true;
}
/// Insert a given stylesheet before another stylesheet in the document.
pub fn insert_stylesheet_before(&mut self,
sheet: &Arc<Stylesheet>,
before: &Arc<Stylesheet>) {
self.remove_stylesheet_if_present(sheet);
let index = self.stylesheets.iter().position(|x| {
arc_ptr_eq(x, before)
}).expect("`before` stylesheet not found");
self.stylesheets.insert(index, sheet.clone());
unique_id: u32,
before_unique_id: u32) {
self.remove_stylesheet_if_present(unique_id);
let index = self.entries.iter().position(|x| {
x.unique_id == before_unique_id
}).expect("`before_unique_id` stylesheet not found");
self.entries.insert(index, StylesheetSetEntry {
unique_id: unique_id,
sheet: sheet.clone(),
});
self.dirty = true;
}
/// Remove a given stylesheet from the set.
pub fn remove_stylesheet(&mut self, sheet: &Arc<Stylesheet>) {
self.remove_stylesheet_if_present(sheet);
pub fn remove_stylesheet(&mut self, unique_id: u32) {
self.remove_stylesheet_if_present(unique_id);
self.dirty = true;
}
@ -90,9 +109,11 @@ impl StylesheetSet {
}
/// Flush the current set, unmarking it as dirty.
pub fn flush(&mut self) -> &[Arc<Stylesheet>] {
pub fn flush(&mut self, sheets: &mut Vec<Arc<Stylesheet>>) {
self.dirty = false;
&self.stylesheets
for entry in &self.entries {
sheets.push(entry.sheet.clone())
}
}
/// Mark the stylesheets as dirty, because something external may have