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layout: Implement z-index.

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This commit is contained in:
Patrick Walton 2014-10-02 14:11:04 -07:00
parent eff0de0ce1
commit 01c90d8d6a
9 changed files with 81 additions and 18 deletions
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8
components/gfx/display_list/mod.rs
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@ -177,9 +177,6 @@ struct StackingContext {
/// All other content.
pub content: DisplayList,
/// Positioned descendant stacking contexts, along with their `z-index` levels.
///
/// TODO(pcwalton): `z-index` should be the actual CSS property value in order to handle
/// `auto`, not just an integer.
pub positioned_descendants: Vec<(i32, DisplayList)>,
}
@ -383,7 +380,10 @@ impl DisplayList {
// Steps 1 and 2: Borders and background for the root.
result.push_all_move(background_and_borders);
// TODO(pcwalton): Sort positioned children according to z-index.
// Sort positioned children according to z-index.
positioned_descendants.sort_by(|&(z_index_a, _), &(z_index_b, _)| {
z_index_a.cmp(&z_index_b)
});
// Step 3: Positioned descendants with negative z-indices.
for &(ref mut z_index, ref mut list) in positioned_descendants.iter_mut() {