layers/view/
build_layer_tree.rs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
use std::collections::{HashMap, HashSet, VecDeque};

use crate::engine::{storage::TreeStorageId, NodeRef};
use crate::layers::layer::Layer;
use crate::prelude::*;
use indextree::NodeId;

/// Helper function to remove a viewlayer from the cache
fn cache_remove_viewlayer(
    view_key: &String,
    layer_id: Option<&NodeRef>,
    cache_viewlayer: &mut HashMap<String, VecDeque<NodeRef>>,
) {
    let nodes = if let Some(nodes) = cache_viewlayer.get_mut(view_key) {
        if let Some(layer_id) = layer_id {
            nodes.retain(|node| !node_same_index(node.0, layer_id.0));
        } else {
            nodes.pop_front();
        }
        Some(nodes.clone())
    } else {
        None
    };
    if let Some(nodes) = nodes {
        cache_viewlayer.insert(view_key.clone(), nodes.clone());
    }
}
fn node_same_index(node1: impl Into<TreeStorageId>, node2: impl Into<TreeStorageId>) -> bool {
    let node1: TreeStorageId = node1.into();
    let node2: TreeStorageId = node2.into();
    let index1: usize = node1.into();
    let index2: usize = node2.into();
    index1 == index2
}
fn cache_remove_id(id: &NodeRef, cache_viewlayer: &mut HashMap<String, VecDeque<NodeRef>>) {
    let mut keys: Vec<String> = Vec::new();
    for (key, nodes) in cache_viewlayer.iter() {
        if nodes.iter().any(|node| node_same_index(node.0, id.0)) {
            keys.push(key.clone());
        }
    }
    for key in keys {
        cache_remove_viewlayer(&key, Some(id), cache_viewlayer);
    }
}

/// A trait for structs that accept a layertree. It is implemented for Layer
/// it generates and updates the properties of a hierarchy of layers
/// described by the layertree
pub trait BuildLayerTree {
    fn build_layer_tree_internal(
        &self,
        viewlayer_tree: &LayerTree,
        cache_viewlayer: &mut HashMap<String, VecDeque<NodeRef>>,
    );
    fn build_layer_tree(&self, viewlayer_tree: impl AsRef<LayerTree>) {
        let viewlayer_tree = viewlayer_tree.as_ref();
        self.build_layer_tree_internal(viewlayer_tree, &mut HashMap::new());
    }
}

impl BuildLayerTree for Layer {
    #[profiling::function]
    fn build_layer_tree_internal(
        &self,
        viewlayer_tree: &LayerTree,
        cache_viewlayer: &mut HashMap<String, VecDeque<NodeRef>>,
    ) {
        let scene_layer = self;

        if !viewlayer_tree.key.is_empty() {
            scene_layer.set_key(viewlayer_tree.key.clone());
        }

        if let Some((position, transition)) = viewlayer_tree.position {
            scene_layer.set_position(position, transition);
        }
        if let Some((anchor_point, transition)) = viewlayer_tree.anchor_point {
            scene_layer.set_anchor_point(anchor_point, transition);
        }
        if let Some((scale, transition)) = viewlayer_tree.scale {
            scene_layer.set_scale(scale, transition);
        }
        if let Some((background_color, transition)) = viewlayer_tree.background_color.clone() {
            scene_layer.set_background_color(background_color, transition);
        }
        if let Some((border_color, transition)) = viewlayer_tree.border_color {
            scene_layer.set_border_color(border_color, transition);
        }
        if let Some((border_width, transition)) = viewlayer_tree.border_width {
            scene_layer.set_border_width(border_width, transition);
        }
        if let Some((border_corner_radius, transition)) = viewlayer_tree.border_corner_radius {
            scene_layer.set_border_corner_radius(border_corner_radius, transition);
        }
        if let Some((size, transition)) = viewlayer_tree.size {
            scene_layer.set_size(size, transition);
        }
        if let Some((shadow_offset, transition)) = viewlayer_tree.shadow_offset {
            scene_layer.set_shadow_offset(shadow_offset, transition);
        }
        if let Some((shadow_radius, transition)) = viewlayer_tree.shadow_radius {
            scene_layer.set_shadow_radius(shadow_radius, transition);
        }
        if let Some((shadow_color, transition)) = viewlayer_tree.shadow_color {
            scene_layer.set_shadow_color(shadow_color, transition);
        }
        if let Some((shadow_spread, transition)) = viewlayer_tree.shadow_spread {
            scene_layer.set_shadow_spread(shadow_spread, transition);
        }
        if let Some(layout_style) = viewlayer_tree.layout_style.clone() {
            scene_layer.set_layout_style(layout_style);
        }
        if let Some((opacity, transition)) = viewlayer_tree.opacity {
            scene_layer.set_opacity(opacity, transition);
        }
        if let Some(blend_mode) = viewlayer_tree.blend_mode {
            scene_layer.set_blend_mode(blend_mode);
        }

        if let Some(content) = viewlayer_tree.content.clone() {
            scene_layer.set_draw_content(content);
        }

        if let Some(image_cache) = viewlayer_tree.image_cache {
            scene_layer.set_image_cached(image_cache);
        }
        if let Some(picture_cached) = viewlayer_tree.picture_cached {
            scene_layer.set_picture_cached(picture_cached);
        }
        if let Some(pointer_events) = viewlayer_tree.pointer_events {
            scene_layer.set_pointer_events(pointer_events);
        }
        if let Some(color_filter) = viewlayer_tree.color_filter.clone() {
            scene_layer.set_color_filter(color_filter);
        } else {
            scene_layer.set_color_filter(None);
        }
        if let Some(shape) = viewlayer_tree.shape.clone() {
            scene_layer.shape(shape);
        }

        // Handlers
        scene_layer.remove_all_pointer_handlers();

        if let Some(on_pointer_move) = viewlayer_tree.on_pointer_move.clone() {
            scene_layer.add_on_pointer_move(on_pointer_move);
        }
        if let Some(on_pointer_in) = viewlayer_tree.on_pointer_in.clone() {
            scene_layer.add_on_pointer_in(on_pointer_in);
        }
        if let Some(on_pointer_out) = viewlayer_tree.on_pointer_out.clone() {
            scene_layer.add_on_pointer_out(on_pointer_out);
        }
        if let Some(on_pointer_press) = viewlayer_tree.on_pointer_press.clone() {
            scene_layer.add_on_pointer_press(on_pointer_press);
        }
        if let Some(on_pointer_release) = viewlayer_tree.on_pointer_release.clone() {
            scene_layer.add_on_pointer_release(on_pointer_release);
        }
        if let Some(clip_content) = viewlayer_tree.clip_content {
            scene_layer.set_clip_content(clip_content, None);
        }
        if let Some(clip_children) = viewlayer_tree.clip_children {
            scene_layer.set_clip_children(clip_children, None);
        }
        let layer_id = scene_layer.id;
        let engine = scene_layer.engine.clone();

        if let Some(replicate_node) = viewlayer_tree.replicate_node {
            if let Some(replicate_layer) = engine.get_layer(&replicate_node) {
                scene_layer.set_draw_content(replicate_layer.as_content());
                replicate_layer.add_follower_node(scene_layer.id());
                
                // Set the following relationship so this layer knows which node it's replicating
                engine.scene.with_arena_mut(|arena| {
                    if let Some(node) = arena.get_mut(layer_id.0) {
                        let scene_node = node.get_mut();
                        scene_node.following = Some(replicate_node);
                    }
                });
            }
        }

        scene_layer.engine.scene.with_arena_mut(|arena| {
            let ancestors: Vec<NodeId> = layer_id.0.ancestors(arena).collect();
            {
                let node = arena.get_mut(layer_id.0).unwrap();
                if !node.is_removed() {
                    let scene_node = node.get_mut();
                    scene_node.set_needs_layout(true);
                    scene_node.increase_frame();
                }
            }
            for ancestor in ancestors {
                let node = arena.get_mut(ancestor).unwrap();
                if !node.is_removed() {
                    let node = node.get_mut();
                    node.set_needs_layout(true);
                    node.increase_frame();
                }
            }
        });

        // Children
        let mut current_scene_layers_children: HashSet<NodeId> = {
            let children = engine
                .scene
                .with_arena(|arena| layer_id.0.children(arena).collect());
            children
        };

        let mut layer_view_map: HashMap<NodeRef, String> = HashMap::new();
        {
            for (view_key, nodes) in cache_viewlayer.iter() {
                for node_id in nodes.iter() {
                    layer_view_map.insert(*node_id, view_key.clone());
                }
            }
        }
        // Add missing layers
        if let Some(children) = viewlayer_tree.children.as_ref() {
            for child in children.iter() {
                let child_key = child.get_key().clone();
                // check if there is already a layer for this child otherwise create one
                let mut nodes = cache_viewlayer.get(&child_key).cloned().unwrap_or_default();
                let child_layer_id = nodes.pop_front();

                // get or create the child layer
                let (child_layer_id, child_layer) = child_layer_id
                    .and_then(|child_layer_id| {
                        // try to use existing layer
                        if !engine.scene.is_node_removed(child_layer_id) {
                            // we should not need to add the layer back to the parent
                            let child_layer = engine.get_layer(&child_layer_id).unwrap();
                            engine.append_layer(&child_layer.id, Some(layer_id));
                            return Some((child_layer_id, child_layer));
                        }
                        None
                    })
                    .unwrap_or_else(|| {
                        // the child layer does not exist, or is removed
                        let layer = engine.new_layer();
                        engine.append_layer(&layer, Some(layer_id));
                        (layer.id, layer)
                    });

                layer_view_map.retain(|n, _| !node_same_index(n.0, child_layer_id.0));
                cache_remove_id(&child_layer_id, cache_viewlayer);
                drop(nodes);

                // re-add the layer to the parent in case it is not in the right order
                child.mount_layer(child_layer.clone());
                let child = child.render_layertree();
                child_layer.build_layer_tree_internal(&child, cache_viewlayer);
                {
                    // add child to cache
                    let mut nodes = cache_viewlayer.get(&child_key).cloned().unwrap_or_default();
                    nodes.push_back(child_layer_id);
                    cache_viewlayer.insert(child.get_key(), nodes);
                }

                current_scene_layers_children.retain(|id| !node_same_index(*id, child_layer_id.0));
            }
        }

        // Remove remaining extra layers
        for scene_layer_id in current_scene_layers_children {
            let scene_layer_ref = NodeRef(scene_layer_id);

            let layer = engine.get_layer(&scene_layer_ref).unwrap();
            // let scene_node = engine.scene.get_node_sync(scene_layer_id).unwrap();
            // let scene_node = scene_node.get();

            // let transition = scene_layer.layer.set_size(
            //     Size {
            //         width: taffy::Dimension::Length(0.0),
            //         height: taffy::Dimension::Length(0.0),
            //     },
            //     Some(Transition {
            //         duration: 0.5,
            //         ..Default::default()
            //     }),
            // );

            {
                if let Some(view_key) = layer_view_map.get(&scene_layer_ref) {
                    cache_remove_viewlayer(view_key, None, cache_viewlayer);
                }
            }
            // let scene_layer_clone = scene_layer.clone();
            // scene_layer.layer.on_finish(transition, move |_| {

            layer.remove();
            // });
        }
    }
}