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
|
//! Display an interactive selector of a single value from a range of values.
//!
//! A [`Slider`] has some local [`State`].
//!
//! [`Slider`]: struct.Slider.html
//! [`State`]: struct.State.html
use std::hash::Hash;
use crate::input::{mouse, ButtonState};
use crate::{layout, Element, Event, Hasher, Layout, Length, Point, Widget};
pub use iced_core::slider::*;
impl<'a, Message, Renderer> Widget<Message, Renderer> for Slider<'a, Message>
where
Renderer: self::Renderer,
{
fn width(&self) -> Length {
self.width
}
fn height(&self) -> Length {
Length::Shrink
}
fn layout(
&self,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
renderer.layout(&self, limits)
}
fn on_event(
&mut self,
event: Event,
layout: Layout<'_>,
cursor_position: Point,
messages: &mut Vec<Message>,
_renderer: &Renderer,
) {
let mut change = || {
let bounds = layout.bounds();
if cursor_position.x <= bounds.x {
messages.push((self.on_change)(*self.range.start()));
} else if cursor_position.x >= bounds.x + bounds.width {
messages.push((self.on_change)(*self.range.end()));
} else {
let percent = (cursor_position.x - bounds.x) / bounds.width;
let value = (self.range.end() - self.range.start()) * percent
+ self.range.start();
messages.push((self.on_change)(value));
}
};
match event {
Event::Mouse(mouse::Event::Input {
button: mouse::Button::Left,
state,
}) => match state {
ButtonState::Pressed => {
if layout.bounds().contains(cursor_position) {
change();
self.state.is_dragging = true;
}
}
ButtonState::Released => {
self.state.is_dragging = false;
}
},
Event::Mouse(mouse::Event::CursorMoved { .. }) => {
if self.state.is_dragging {
change();
}
}
_ => {}
}
}
fn draw(
&self,
renderer: &mut Renderer,
layout: Layout<'_>,
cursor_position: Point,
) -> Renderer::Output {
renderer.draw(&self, layout, cursor_position)
}
fn hash_layout(&self, state: &mut Hasher) {
self.width.hash(state);
}
}
/// The renderer of a [`Slider`].
///
/// Your [renderer] will need to implement this trait before being
/// able to use a [`Slider`] in your user interface.
///
/// [`Slider`]: struct.Slider.html
/// [renderer]: ../../renderer/index.html
pub trait Renderer: crate::Renderer {
/// Creates a [`Node`] for the provided [`Radio`].
///
/// [`Node`]: ../../struct.Node.html
/// [`Radio`]: struct.Radio.html
fn layout<Message>(
&self,
slider: &Slider<'_, Message>,
limits: &layout::Limits,
) -> layout::Node;
/// Draws a [`Slider`].
///
/// It receives:
/// * the current cursor position
/// * the bounds of the [`Slider`]
/// * the local state of the [`Slider`]
/// * the range of values of the [`Slider`]
/// * the current value of the [`Slider`]
///
/// [`Slider`]: struct.Slider.html
/// [`State`]: struct.State.html
/// [`Class`]: enum.Class.html
fn draw<Message>(
&mut self,
slider: &Slider<'_, Message>,
layout: Layout<'_>,
cursor_position: Point,
) -> Self::Output;
}
impl<'a, Message, Renderer> From<Slider<'a, Message>>
for Element<'a, Message, Renderer>
where
Renderer: self::Renderer,
Message: 'static,
{
fn from(slider: Slider<'a, Message>) -> Element<'a, Message, Renderer> {
Element::new(slider)
}
}
|
