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137 lines
4.5 KiB
Rust
137 lines
4.5 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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//! A centralized set of stylesheets for a document.
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use std::slice;
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use stylearc::Arc;
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use stylesheets::Stylesheet;
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/// Entry for a StylesheetSet. We don't bother creating a constructor, because
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/// there's no sensible defaults for the member variables.
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pub struct StylesheetSetEntry {
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unique_id: u64,
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sheet: Arc<Stylesheet>,
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}
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/// A iterator over the stylesheets of a list of entries in the StylesheetSet.
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#[derive(Clone)]
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pub struct StylesheetIterator<'a>(slice::Iter<'a, StylesheetSetEntry>);
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impl<'a> Iterator for StylesheetIterator<'a> {
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type Item = &'a Arc<Stylesheet>;
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fn next(&mut self) -> Option<Self::Item> {
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self.0.next().map(|entry| &entry.sheet)
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}
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}
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/// The set of stylesheets effective for a given document.
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pub struct StylesheetSet {
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/// The actual list of all the stylesheets that apply to the given document,
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/// each stylesheet associated with a unique ID.
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///
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/// This is only a list of top-level stylesheets, and as such it doesn't
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/// include recursive `@import` rules.
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entries: Vec<StylesheetSetEntry>,
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/// Whether the entries list above has changed since the last restyle.
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dirty: bool,
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/// Has author style been disabled?
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author_style_disabled: bool,
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}
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impl StylesheetSet {
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/// Create a new empty StylesheetSet.
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pub fn new() -> Self {
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StylesheetSet {
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entries: vec![],
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dirty: false,
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author_style_disabled: false,
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}
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}
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/// Returns whether author styles have been disabled for the current
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/// stylesheet set.
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pub fn author_style_disabled(&self) -> bool {
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self.author_style_disabled
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}
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fn remove_stylesheet_if_present(&mut self, unique_id: u64) {
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self.entries.retain(|x| x.unique_id != unique_id);
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}
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/// Appends a new stylesheet to the current set.
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pub fn append_stylesheet(&mut self, sheet: &Arc<Stylesheet>,
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unique_id: u64) {
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self.remove_stylesheet_if_present(unique_id);
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self.entries.push(StylesheetSetEntry {
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unique_id: unique_id,
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sheet: sheet.clone(),
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});
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self.dirty = true;
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}
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/// Prepend a new stylesheet to the current set.
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pub fn prepend_stylesheet(&mut self, sheet: &Arc<Stylesheet>,
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unique_id: u64) {
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self.remove_stylesheet_if_present(unique_id);
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self.entries.insert(0, StylesheetSetEntry {
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unique_id: unique_id,
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sheet: sheet.clone(),
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});
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self.dirty = true;
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}
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/// Insert a given stylesheet before another stylesheet in the document.
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pub fn insert_stylesheet_before(&mut self,
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sheet: &Arc<Stylesheet>,
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unique_id: u64,
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before_unique_id: u64) {
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self.remove_stylesheet_if_present(unique_id);
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let index = self.entries.iter().position(|x| {
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x.unique_id == before_unique_id
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}).expect("`before_unique_id` stylesheet not found");
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self.entries.insert(index, StylesheetSetEntry {
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unique_id: unique_id,
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sheet: sheet.clone(),
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});
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self.dirty = true;
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}
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/// Remove a given stylesheet from the set.
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pub fn remove_stylesheet(&mut self, unique_id: u64) {
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self.remove_stylesheet_if_present(unique_id);
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self.dirty = true;
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}
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/// Notes that the author style has been disabled for this document.
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pub fn set_author_style_disabled(&mut self, disabled: bool) {
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if self.author_style_disabled == disabled {
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return;
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}
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self.author_style_disabled = disabled;
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self.dirty = true;
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}
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/// Returns whether the given set has changed from the last flush.
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pub fn has_changed(&self) -> bool {
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self.dirty
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}
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/// Flush the current set, unmarking it as dirty, and returns an iterator
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/// over the new stylesheet list.
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pub fn flush(&mut self) -> StylesheetIterator {
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self.dirty = false;
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StylesheetIterator(self.entries.iter())
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}
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/// Mark the stylesheets as dirty, because something external may have
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/// invalidated it.
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///
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/// FIXME(emilio): Make this more granular.
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pub fn force_dirty(&mut self) {
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self.dirty = true;
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}
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}
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