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
|
//! Allow your users to perform actions by pressing a button.
//!
//! A [`Button`] has some local [`State`] and a [`Class`].
//!
//! [`Button`]: struct.Button.html
//! [`State`]: struct.State.html
//! [`Class`]: enum.Class.html
use crate::input::{mouse, ButtonState};
use crate::{layout, Element, Event, Hasher, Layout, Length, Point, Widget};
use std::hash::Hash;
pub use iced_core::button::State;
pub type Button<'a, Message, Renderer> =
iced_core::Button<'a, Message, Element<'a, Message, Renderer>>;
impl<'a, Message, Renderer> Widget<Message, Renderer>
for Button<'a, Message, Renderer>
where
Renderer: self::Renderer,
Message: Clone + std::fmt::Debug,
{
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,
) {
match event {
Event::Mouse(mouse::Event::Input {
button: mouse::Button::Left,
state,
}) => {
if let Some(on_press) = self.on_press.clone() {
let bounds = layout.bounds();
match state {
ButtonState::Pressed => {
self.state.is_pressed =
bounds.contains(cursor_position);
}
ButtonState::Released => {
let is_clicked = self.state.is_pressed
&& bounds.contains(cursor_position);
self.state.is_pressed = false;
if is_clicked {
messages.push(on_press);
}
}
}
}
}
_ => {}
}
}
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);
self.content.hash_layout(state);
}
}
/// The renderer of a [`Button`].
///
/// Your [renderer] will need to implement this trait before being
/// able to use a [`Button`] in your user interface.
///
/// [`Button`]: struct.Button.html
/// [renderer]: ../../renderer/index.html
pub trait Renderer: crate::Renderer + Sized {
/// Creates a [`Node`] for the provided [`Button`].
///
/// [`Node`]: ../../struct.Node.html
/// [`Button`]: struct.Button.html
fn layout<Message>(
&self,
button: &Button<'_, Message, Self>,
limits: &layout::Limits,
) -> layout::Node;
/// Draws a [`Button`].
///
/// [`Button`]: struct.Button.html
fn draw<Message>(
&mut self,
button: &Button<'_, Message, Self>,
layout: Layout<'_>,
cursor_position: Point,
) -> Self::Output;
}
impl<'a, Message, Renderer> From<Button<'a, Message, Renderer>>
for Element<'a, Message, Renderer>
where
Renderer: 'static + self::Renderer,
Message: 'static + Clone + std::fmt::Debug,
{
fn from(
button: Button<'a, Message, Renderer>,
) -> Element<'a, Message, Renderer> {
Element::new(button)
}
}
|
