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

use std::num::NonZeroU128;

use accesskit::NodeId as AccessibilityId;
use dioxus_core::{use_hook, AttributeValue};
use dioxus_hooks::{use_context, use_context_provider};
use dioxus_signals::{Readable, Signal, Writable};
use freya_core::navigation_mode::NavigationMode;
use freya_elements::events::{keyboard::Code, KeyboardEvent};
use freya_node_state::CustomAttributeValues;
use uuid::Uuid;

pub type FocusId = AccessibilityId;

/// Manage the focus operations of given Node
#[derive(Clone)]
pub struct UseFocus {
    id: AccessibilityId,
    focused_id: Signal<Option<AccessibilityId>>,
    navigation_mode: Signal<NavigationMode>,
}

impl UseFocus {
    /// Focus this node
    pub fn focus(&mut self) {
        *self.focused_id.write() = Some(self.id)
    }

    /// Get the node focus ID
    pub fn id(&self) -> AccessibilityId {
        self.id
    }

    /// Create a node focus ID attribute
    pub fn attribute(&self) -> AttributeValue {
        AttributeValue::any_value(CustomAttributeValues::FocusId(self.id))
    }

    /// Check if this node is currently focused
    pub fn is_focused(&self) -> bool {
        Some(self.id) == *self.focused_id.read()
    }

    /// Check if this node is currently selected
    pub fn is_selected(&self) -> bool {
        self.is_focused() && *self.navigation_mode.read() == NavigationMode::Keyboard
    }

    /// Unfocus the currently focused node.
    pub fn unfocus(&mut self) {
        *self.focused_id.write() = None;
    }

    /// Validate keydown event
    pub fn validate_keydown(&self, e: KeyboardEvent) -> bool {
        e.data.code == Code::Enter && self.is_selected()
    }
}

/// Create a focus manager for a node.
pub fn use_focus() -> UseFocus {
    let focused_id = use_context::<Signal<Option<FocusId>>>();
    let navigation_mode = use_context::<Signal<NavigationMode>>();

    use_hook(move || {
        let id = AccessibilityId(NonZeroU128::new(Uuid::new_v4().as_u128()).unwrap());
        UseFocus {
            id,
            focused_id,
            navigation_mode,
        }
    })
}

/// Create a focus provider.
pub fn use_init_focus() {
    use_context_provider::<Signal<Option<FocusId>>>(|| Signal::new(None));
    use_context_provider::<Signal<NavigationMode>>(|| Signal::new(NavigationMode::NotKeyboard));
}

#[cfg(test)]
mod test {
    use crate::use_focus;
    use freya::prelude::*;
    use freya_testing::{
        events::pointer::MouseButton, launch_test_with_config, FreyaEvent, TestingConfig,
    };

    #[tokio::test]
    pub async fn track_focus() {
        #[allow(non_snake_case)]
        fn OherChild() -> Element {
            let mut focus_manager = use_focus();

            rsx!(
                rect {
                    width: "100%",
                    height: "50%",
                    onclick: move |_| focus_manager.focus(),
                    "{focus_manager.is_focused()}"
                }
            )
        }

        fn use_focus_app() -> Element {
            rsx!(
                rect {
                    width: "100%",
                    height: "100%",
                    OherChild {},
                    OherChild {}
                }
            )
        }

        let mut utils = launch_test_with_config(
            use_focus_app,
            *TestingConfig::default().with_size((100.0, 100.0).into()),
        );

        // Initial state
        utils.wait_for_update().await;
        let root = utils.root().get(0);
        assert_eq!(root.get(0).get(0).text(), Some("false"));
        assert_eq!(root.get(1).get(0).text(), Some("false"));

        // Click on the first rect
        utils.push_event(FreyaEvent::Mouse {
            name: "click".to_string(),
            cursor: (5.0, 5.0).into(),
            button: Some(MouseButton::Left),
        });

        // First rect is now focused
        utils.wait_for_update().await;
        assert_eq!(root.get(0).get(0).text(), Some("true"));
        assert_eq!(root.get(1).get(0).text(), Some("false"));

        // Click on the second rect
        utils.push_event(FreyaEvent::Mouse {
            name: "click".to_string(),
            cursor: (5.0, 75.0).into(),
            button: Some(MouseButton::Left),
        });

        // Second rect is now focused
        utils.wait_for_update().await;
        assert_eq!(root.get(0).get(0).text(), Some("false"));
        assert_eq!(root.get(1).get(0).text(), Some("true"));
    }
}