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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
//! Decorate content and apply alignment.
use std::hash::Hash;
use crate::{
layout, Align, Clipboard, Element, Event, Hasher, Layout, Length, Point,
Rectangle, Widget,
};
use std::u32;
/// An element decorating some content.
///
/// It is normally used for alignment purposes.
#[allow(missing_debug_implementations)]
pub struct Container<'a, Message, Renderer: self::Renderer> {
width: Length,
height: Length,
max_width: u32,
max_height: u32,
horizontal_alignment: Align,
vertical_alignment: Align,
style: Renderer::Style,
content: Element<'a, Message, Renderer>,
}
impl<'a, Message, Renderer> Container<'a, Message, Renderer>
where
Renderer: self::Renderer,
{
/// Creates an empty [`Container`].
///
/// [`Container`]: struct.Container.html
pub fn new<T>(content: T) -> Self
where
T: Into<Element<'a, Message, Renderer>>,
{
Container {
width: Length::Shrink,
height: Length::Shrink,
max_width: u32::MAX,
max_height: u32::MAX,
horizontal_alignment: Align::Start,
vertical_alignment: Align::Start,
style: Renderer::Style::default(),
content: content.into(),
}
}
/// Sets the width of the [`Container`].
///
/// [`Container`]: struct.Container.html
pub fn width(mut self, width: Length) -> Self {
self.width = width;
self
}
/// Sets the height of the [`Container`].
///
/// [`Container`]: struct.Container.html
pub fn height(mut self, height: Length) -> Self {
self.height = height;
self
}
/// Sets the maximum width of the [`Container`].
///
/// [`Container`]: struct.Container.html
pub fn max_width(mut self, max_width: u32) -> Self {
self.max_width = max_width;
self
}
/// Sets the maximum height of the [`Container`] in pixels.
///
/// [`Container`]: struct.Container.html
pub fn max_height(mut self, max_height: u32) -> Self {
self.max_height = max_height;
self
}
/// Centers the contents in the horizontal axis of the [`Container`].
///
/// [`Container`]: struct.Container.html
pub fn center_x(mut self) -> Self {
self.horizontal_alignment = Align::Center;
self
}
/// Centers the contents in the vertical axis of the [`Container`].
///
/// [`Container`]: struct.Container.html
pub fn center_y(mut self) -> Self {
self.vertical_alignment = Align::Center;
self
}
/// Sets the style the [`Container`].
///
/// [`Container`]: struct.Container.html
pub fn style(mut self, style: impl Into<Renderer::Style>) -> Self {
self.style = style.into();
self
}
}
impl<'a, Message, Renderer> Widget<Message, Renderer>
for Container<'a, Message, Renderer>
where
Renderer: self::Renderer,
{
fn width(&self) -> Length {
self.width
}
fn height(&self) -> Length {
self.height
}
fn layout(
&self,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
let limits = limits
.loose()
.max_width(self.max_width)
.max_height(self.max_height)
.width(self.width)
.height(self.height);
let mut content = self.content.layout(renderer, &limits.loose());
let size = limits.resolve(content.size());
content.align(self.horizontal_alignment, self.vertical_alignment, size);
layout::Node::with_children(size, vec![content])
}
fn on_event(
&mut self,
event: Event,
layout: Layout<'_>,
cursor_position: Point,
messages: &mut Vec<Message>,
renderer: &Renderer,
clipboard: Option<&dyn Clipboard>,
) {
self.content.widget.on_event(
event,
layout.children().next().unwrap(),
cursor_position,
messages,
renderer,
clipboard,
)
}
fn draw(
&self,
renderer: &mut Renderer,
defaults: &Renderer::Defaults,
layout: Layout<'_>,
cursor_position: Point,
) -> Renderer::Output {
renderer.draw(
defaults,
layout.bounds(),
cursor_position,
&self.style,
&self.content,
layout.children().next().unwrap(),
)
}
fn hash_layout(&self, state: &mut Hasher) {
0.hash(state);
self.width.hash(state);
self.height.hash(state);
self.max_width.hash(state);
self.max_height.hash(state);
self.content.hash_layout(state);
}
}
pub trait Renderer: crate::Renderer {
type Style: Default;
/// Draws a [`Container`].
///
/// [`Container`]: struct.Container.html
fn draw<Message>(
&mut self,
defaults: &Self::Defaults,
bounds: Rectangle,
cursor_position: Point,
style: &Self::Style,
content: &Element<'_, Message, Self>,
content_layout: Layout<'_>,
) -> Self::Output;
}
impl<'a, Message, Renderer> From<Container<'a, Message, Renderer>>
for Element<'a, Message, Renderer>
where
Renderer: 'a + self::Renderer,
Message: 'static,
{
fn from(
column: Container<'a, Message, Renderer>,
) -> Element<'a, Message, Renderer> {
Element::new(column)
}
}
|
