lemna 0.4.0

A Reactive UI framework for Rust
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

use std::fmt;
use std::hash::Hash;

use crate::base_types::*;
use crate::component::{Component, ComponentHasher, Message, RenderContext};
use crate::event;
use crate::render::{
    renderables::shape::{self, Shape},
    Renderable,
};
use crate::style::Styled;
use lemna_macros::{component, state_component_impl};

// TODO Make a tooltip
// TODO Font icons

#[derive(Debug, Default)]
struct ToggleState {
    pressed: bool,
}

#[component(State = "ToggleState", Styled, Internal)]
pub struct Toggle {
    active: bool,
    on_change: Option<Box<dyn Fn(bool) -> Message + Send + Sync>>,
}

impl fmt::Debug for Toggle {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("Toggle")
            .field("active", &self.active)
            .finish()
    }
}

impl Toggle {
    pub fn new(active: bool) -> Self {
        Self {
            active,
            on_change: None,
            state: Some(ToggleState::default()),
            dirty: false,
            class: Default::default(),
            style_overrides: Default::default(),
        }
    }

    pub fn on_change(mut self, change_fn: Box<dyn Fn(bool) -> Message + Send + Sync>) -> Self {
        self.on_change = Some(change_fn);
        self
    }
}

#[state_component_impl(ToggleState)]
impl Component for Toggle {
    fn on_mouse_leave(&mut self, _event: &mut event::Event<event::MouseLeave>) {
        self.state_mut().pressed = false;
    }

    fn on_mouse_down(&mut self, _event: &mut event::Event<event::MouseDown>) {
        self.state_mut().pressed = true;
    }

    fn on_mouse_up(&mut self, _event: &mut event::Event<event::MouseUp>) {
        self.state_mut().pressed = false;
    }

    fn on_click(&mut self, event: &mut event::Event<event::Click>) {
        if let Some(f) = &self.on_change {
            event.emit(f(!self.active));
        }
    }

    // Same as on_click
    fn on_double_click(&mut self, event: &mut event::Event<event::DoubleClick>) {
        if let Some(f) = &self.on_change {
            event.emit(f(!self.active));
        }
    }

    fn render_hash(&self, hasher: &mut ComponentHasher) {
        self.active.hash(hasher);
        self.state_ref().pressed.hash(hasher);
    }

    fn render(&mut self, context: RenderContext) -> Option<Vec<Renderable>> {
        use lyon::tessellation::math as lyon_math;
        use lyon::tessellation::{self, basic_shapes};

        let background_color: Color = self.style_val("background_color").into();
        let active_color: Color = self.style_val("active_color").into();
        let border_color: Color = self.style_val("border_color").into();
        let highlight_color: Color = self.style_val("highlight_color").into();
        let border_width: f32 = self.style_val("border_width").unwrap().f32();

        let mut geometry = shape::ShapeGeometry::new();
        let center = lyon_math::point(context.aabb.width() / 2.0, context.aabb.height() / 2.0);

        let fill_count = basic_shapes::fill_circle(
            center,
            context.aabb.width() / 2.0,
            &tessellation::FillOptions::tolerance(shape::TOLERANCE),
            &mut tessellation::BuffersBuilder::new(
                &mut geometry,
                shape::Vertex::basic_vertex_constructor,
            ),
        )
        .unwrap()
        .indices;

        if border_width > 0.0 {
            basic_shapes::stroke_circle(
                center,
                context.aabb.width() / 2.0,
                &tessellation::StrokeOptions::tolerance(shape::TOLERANCE).dont_apply_line_width(),
                &mut tessellation::BuffersBuilder::new(
                    &mut geometry,
                    shape::Vertex::stroke_vertex_constructor,
                ),
            )
            .unwrap();
        }

        Some(vec![Renderable::Shape(Shape::new(
            geometry,
            fill_count,
            if self.state_ref().pressed {
                highlight_color
            } else if self.active {
                active_color
            } else {
                background_color
            },
            border_color,
            border_width * 0.5,
            0.0,
            &mut context.caches.shape_buffer_cache.write().unwrap(),
            context.prev_state.as_ref().and_then(|v| match v.get(0) {
                Some(Renderable::Shape(r)) => Some(r.buffer_id),
                _ => None,
            }),
        ))])
    }
}