vizia_core/layout/
cache.rs

1use crate::cache::CachedData;
2use morphorm::Cache;
3
4use crate::prelude::*;
5use bitflags::bitflags;
6
7bitflags! {
8    /// Bitflag representing whether the bounds of a view has changed after relayout.
9    #[derive(Debug, Clone, Copy)]
10    pub struct GeoChanged: u8 {
11        /// Flag representing whether the X position of a view has changed.
12        const POSX_CHANGED = 1 << 0;
13        /// Flag representing whether the Y position of a view has changed.
14        const POSY_CHANGED = 1 << 1;
15        /// Flag representing whether the width position of a view has changed.
16        const WIDTH_CHANGED = 1 << 2;
17        /// Flag representing whether the height position of a view has changed.
18        const HEIGHT_CHANGED = 1 << 3;
19    }
20}
21
22impl Cache for CachedData {
23    type Node = Entity;
24
25    fn set_bounds(&mut self, node: &Self::Node, posx: f32, posy: f32, width: f32, height: f32) {
26        if let Some(bounds) = self.relative_bounds.get_mut(*node) {
27            bounds.x = posx.round();
28            bounds.y = posy.round();
29            bounds.w = width;
30            bounds.h = height;
31        }
32    }
33
34    fn posx(&self, node: &Self::Node) -> f32 {
35        // Morphorm works with positions relative to the parent, and `set_bounds` writes into
36        // `relative_bounds`, so these getters must read from `relative_bounds` too. Reading the
37        // absolute `bounds` here would make incremental relayout (which restarts from a non-root
38        // node and feeds its cached position back through `set_bounds`) double-count the parent
39        // offset, shifting the subtree off-screen.
40        self.relative_bounds.get(*node).map_or(0.0, |b| b.x)
41    }
42
43    fn posy(&self, node: &Self::Node) -> f32 {
44        self.relative_bounds.get(*node).map_or(0.0, |b| b.y)
45    }
46
47    fn width(&self, node: &Self::Node) -> f32 {
48        self.relative_bounds.get(*node).map_or(0.0, |b| b.w)
49    }
50
51    fn height(&self, node: &Self::Node) -> f32 {
52        self.relative_bounds.get(*node).map_or(0.0, |b| b.h)
53    }
54}
vizia_core/layout/cache.rs

vizia_core/layout/
cache.rs
