logo
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

//! Provide progress feedback to your users.
use crate::layout;
use crate::renderer;
use crate::{Color, Element, Layout, Length, Point, Rectangle, Size, Widget};

use std::ops::RangeInclusive;

pub use iced_style::progress_bar::{Style, StyleSheet};

/// A bar that displays progress.
///
/// # Example
/// ```
/// # use iced_native::widget::ProgressBar;
/// let value = 50.0;
///
/// ProgressBar::new(0.0..=100.0, value);
/// ```
///
/// ![Progress bar drawn with `iced_wgpu`](https://user-images.githubusercontent.com/18618951/71662391-a316c200-2d51-11ea-9cef-52758cab85e3.png)
#[allow(missing_debug_implementations)]
pub struct ProgressBar<'a> {
    range: RangeInclusive<f32>,
    value: f32,
    width: Length,
    height: Option<Length>,
    style_sheet: Box<dyn StyleSheet + 'a>,
}

impl<'a> ProgressBar<'a> {
    /// The default height of a [`ProgressBar`].
    pub const DEFAULT_HEIGHT: u16 = 30;

    /// Creates a new [`ProgressBar`].
    ///
    /// It expects:
    ///   * an inclusive range of possible values
    ///   * the current value of the [`ProgressBar`]
    pub fn new(range: RangeInclusive<f32>, value: f32) -> Self {
        ProgressBar {
            value: value.max(*range.start()).min(*range.end()),
            range,
            width: Length::Fill,
            height: None,
            style_sheet: Default::default(),
        }
    }

    /// Sets the width of the [`ProgressBar`].
    pub fn width(mut self, width: Length) -> Self {
        self.width = width;
        self
    }

    /// Sets the height of the [`ProgressBar`].
    pub fn height(mut self, height: Length) -> Self {
        self.height = Some(height);
        self
    }

    /// Sets the style of the [`ProgressBar`].
    pub fn style(
        mut self,
        style_sheet: impl Into<Box<dyn StyleSheet + 'a>>,
    ) -> Self {
        self.style_sheet = style_sheet.into();
        self
    }
}

impl<'a, Message, Renderer> Widget<Message, Renderer> for ProgressBar<'a>
where
    Renderer: crate::Renderer,
{
    fn width(&self) -> Length {
        self.width
    }

    fn height(&self) -> Length {
        self.height.unwrap_or(Length::Units(Self::DEFAULT_HEIGHT))
    }

    fn layout(
        &self,
        _renderer: &Renderer,
        limits: &layout::Limits,
    ) -> layout::Node {
        let limits = limits
            .width(self.width)
            .height(self.height.unwrap_or(Length::Units(Self::DEFAULT_HEIGHT)));

        let size = limits.resolve(Size::ZERO);

        layout::Node::new(size)
    }

    fn draw(
        &self,
        renderer: &mut Renderer,
        _style: &renderer::Style,
        layout: Layout<'_>,
        _cursor_position: Point,
        _viewport: &Rectangle,
    ) {
        let bounds = layout.bounds();
        let (range_start, range_end) = self.range.clone().into_inner();

        let active_progress_width = if range_start >= range_end {
            0.0
        } else {
            bounds.width * (self.value - range_start)
                / (range_end - range_start)
        };

        let style = self.style_sheet.style();

        renderer.fill_quad(
            renderer::Quad {
                bounds: Rectangle { ..bounds },
                border_radius: style.border_radius,
                border_width: 0.0,
                border_color: Color::TRANSPARENT,
            },
            style.background,
        );

        if active_progress_width > 0.0 {
            renderer.fill_quad(
                renderer::Quad {
                    bounds: Rectangle {
                        width: active_progress_width,
                        ..bounds
                    },
                    border_radius: style.border_radius,
                    border_width: 0.0,
                    border_color: Color::TRANSPARENT,
                },
                style.bar,
            );
        }
    }
}

impl<'a, Message, Renderer> From<ProgressBar<'a>>
    for Element<'a, Message, Renderer>
where
    Renderer: 'a + crate::Renderer,
    Message: 'a,
{
    fn from(progress_bar: ProgressBar<'a>) -> Element<'a, Message, Renderer> {
        Element::new(progress_bar)
    }
}