ragnarok/
measurement.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
use itertools::sorted;

use crate::{
    EmmitableEvent,
    EventsMeasurer,
    NameOfEvent,
    NodeKey,
    PotentialEvent,
    PotentialEvents,
    SourceEvent,
};

/// For every source event and its derivated events, a global equivalent event is emitted.
pub fn measure_source_global_events<
    Key: NodeKey,
    Name: NameOfEvent,
    Source: SourceEvent<Name = Name>,
    Emmitable: EmmitableEvent<Key = Key, Name = Name>,
>(
    events_measurer: &impl EventsMeasurer<
        Key = Key,
        Name = Name,
        Emmitable = Emmitable,
        Source = Source,
    >,
    source_events: &Vec<Source>,
    emmitable_events: &mut Vec<Emmitable>,
) {
    for source_event in source_events {
        let event_name = source_event.as_event_name();
        let derived_events_names = event_name.get_derived_events();

        for derived_event_name in derived_events_names {
            for global_event_name in derived_event_name.get_global_events() {
                let listeners = events_measurer.get_listeners_of(&global_event_name);

                for listener in listeners {
                    let event = events_measurer.new_emmitable_event(
                        listener,
                        global_event_name,
                        source_event.clone(),
                        None,
                    );
                    emmitable_events.push(event)
                }
            }
        }
    }
}

/// Measure what event listeners could potentially be triggered
pub fn measure_potential_events<
    Key: NodeKey,
    Name: NameOfEvent,
    Source: SourceEvent<Name = Name>,
    Emmitable: EmmitableEvent<Key = Key, Name = Name>,
>(
    source_events: &Vec<Source>,
    events_measurer: &impl EventsMeasurer<
        Key = Key,
        Name = Name,
        Emmitable = Emmitable,
        Source = Source,
    >,
    focus_id: Option<Key>,
) -> PotentialEvents<Key, Name, Source> {
    let mut potential_events = PotentialEvents::default();

    // Walk layer by layer from the bottom to the top
    for (layer, layer_nodes) in sorted(events_measurer.get_layers()) {
        for node_id in layer_nodes.iter() {
            for source_event in source_events {
                let Some(cursor) = source_event.try_cursor() else {
                    if focus_id == Some(*node_id) {
                        let potential_event = PotentialEvent {
                            node_key: *node_id,
                            layer: *layer,
                            name: source_event.as_event_name(),
                            source_event: source_event.clone(),
                        };
                        potential_events
                            .entry(source_event.as_event_name())
                            .or_default()
                            .push(potential_event);
                    }
                    continue;
                };

                if !events_measurer.is_point_inside(*node_id, cursor) {
                    continue;
                }

                let potential_event = PotentialEvent {
                    node_key: *node_id,
                    layer: *layer,
                    name: source_event.as_event_name(),
                    source_event: source_event.clone(),
                };

                potential_events
                    .entry(source_event.as_event_name())
                    .or_insert_with(Vec::new)
                    .push(potential_event);
            }
        }
    }

    potential_events
}

/// Measure what events could be emitted
pub fn measure_emmitable_events<
    Key: NodeKey,
    Name: NameOfEvent,
    Source: SourceEvent<Name = Name>,
    Emmitable: EmmitableEvent,
>(
    potential_events: &PotentialEvents<Key, Name, Source>,
    events_measurer: &impl EventsMeasurer<
        Key = Key,
        Name = Name,
        Emmitable = Emmitable,
        Source = Source,
    >,
) -> Vec<Emmitable> {
    let mut emmitable_events = Vec::new();

    for (event, potential_events) in potential_events {
        // Get the derived events, but exclude globals like some file events
        let derived_events_names = event
            .get_derived_events()
            .into_iter()
            .filter(|event| !event.is_global());

        // Iterate over the derived events (including the source)
        'event: for derived_event_name in derived_events_names {
            let mut child_node: Option<Key> = None;

            // Iterate over the potential events in reverse so the ones in higher layers appeat first
            for PotentialEvent {
                node_key: node_id,
                name,
                source_event,
                ..
            } in potential_events.iter().rev()
            {
                if let Some(child_node) = child_node {
                    if !events_measurer.is_node_parent_of(child_node, *node_id) {
                        continue;
                    }
                }

                if events_measurer.is_listening_to(*node_id, &derived_event_name) {
                    let area = events_measurer.try_area_of(*node_id);
                    if let Some(area) = area {
                        let emmitable_event = events_measurer.new_emmitable_event(
                            *node_id,
                            derived_event_name,
                            source_event.clone(),
                            Some(area),
                        );
                        emmitable_events.push(emmitable_event);

                        // Events that bubble will only be emitted once
                        // Those that don't will be stacked
                        if name.does_bubble() {
                            continue 'event;
                        }
                    }
                }

                if !events_measurer.is_node_transparent(*node_id) && !name.does_go_through_solid() {
                    // If the background isn't transparent,
                    // we must make sure that next nodes are parent of it
                    // This only matters for events that bubble up (e.g. cursor click events)
                    child_node = Some(*node_id);
                }
            }
        }
    }

    emmitable_events
}