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

//! ## fields
//!
//! * `min`
//! * `max`
//!
//! ## Optional fields
//!
//! * `label`
//! * `format`
//! * `power`
//! * `catch`
//!
//! ## Example
//!
//! ```
//! use imgui_ext::ImGuiExt;
//!
//! #[derive(ImGuiExt)]
//! struct Sliders {
//!     #[imgui(slider(min = 0.0, max = 1.0))]
//!     foo: f32,
//!     #[imgui(slider(min = 0, max = 16, format = "bar = %.02f"))]
//!     bar: [i32; 2],
//! }
//! ```
//!
//! ### Result
//!
//! ![][result]
//!
//! [result]: https://i.imgur.com/X2ue0dS.png
use imgui::{
    ImStr, SliderFloat, SliderFloat2, SliderFloat3, SliderFloat4, SliderInt, SliderInt2,
    SliderInt3, SliderInt4, Ui,
};

#[derive(Copy, Clone)]
pub struct SliderParams<'ui, T> {
    pub min: T,
    pub max: T,
    pub label: &'ui ImStr,
    pub format: Option<&'ui ImStr>,
    pub power: Option<f32>,
}

pub trait Slider<T> {
    fn build(ui: &imgui::Ui, elem: &mut Self, params: SliderParams<T>) -> bool;
}

macro_rules! impl_f32_array {
    ($( $arr:ty => $slider:ident ),*) => {$(
        impl Slider<f32> for $arr {
            fn build(ui: &Ui, elem: &mut Self, params: SliderParams<f32>) -> bool {
                let mut s = $slider::new(ui, params.label, elem, params.min, params.max);
                if let Some(disp) = params.format { s = s.display_format(disp); }
                if let Some(power) = params.power { s = s.power(power); }
                s.build()
            }
        }
        impl Slider<f32> for Option<$arr> {
            fn build(ui: &Ui, elem: &mut Self, params: SliderParams<f32>) -> bool {
                if let Some(ref mut elem) = elem {
                    let mut s = $slider::new(ui, params.label, elem, params.min, params.max);
                    if let Some(disp) = params.format { s = s.display_format(disp); }
                    if let Some(power) = params.power { s = s.power(power); }
                    s.build()
                } else {
                    false
                }
            }
        }
    )*};
}

macro_rules! impl_i32_array {
    ($( $arr:ty => $slider:ident ),*) => {$(
        impl Slider<i32> for $arr {
            fn build(ui: &Ui, elem: &mut Self, params: SliderParams<i32>) -> bool {
                let mut s = $slider::new(ui, params.label, elem, params.min, params.max);
                if let Some(disp) = params.format { s = s.display_format(disp); }
                s.build()
            }
        }
        impl Slider<i32> for Option<$arr> {
            fn build(ui: &Ui, elem: &mut Self, params: SliderParams<i32>) -> bool {
                if let Some(ref mut elem) = elem {
                    let mut s = $slider::new(ui, params.label, elem, params.min, params.max);
                    if let Some(disp) = params.format { s = s.display_format(disp); }
                    s.build()
                } else {
                    false
                }
            }
        }
    )*};
}

impl Slider<f32> for f32 {
    fn build(ui: &Ui, elem: &mut Self, params: SliderParams<f32>) -> bool {
        let mut s = SliderFloat::new(ui, params.label, elem, params.min, params.max);
        if let Some(disp) = params.format {
            s = s.display_format(disp);
        }
        if let Some(power) = params.power {
            s = s.power(power);
        }
        s.build()
    }
}

impl Slider<i32> for i32 {
    fn build(ui: &Ui, elem: &mut Self, params: SliderParams<i32>) -> bool {
        let mut s = SliderInt::new(ui, params.label, elem, params.min, params.max);
        if let Some(disp) = params.format {
            s = s.display_format(disp);
        }
        s.build()
    }
}

impl Slider<f32> for Option<f32> {
    #[inline]
    fn build(ui: &Ui, elem: &mut Self, params: SliderParams<f32>) -> bool {
        if let Some(ref mut elem) = elem {
            f32::build(ui, elem, params)
        } else {
            false
        }
    }
}

impl Slider<i32> for Option<i32> {
    #[inline]
    fn build(ui: &Ui, elem: &mut Self, params: SliderParams<i32>) -> bool {
        if let Some(ref mut elem) = elem {
            i32::build(ui, elem, params)
        } else {
            false
        }
    }
}

impl_f32_array! {
    [f32; 2] => SliderFloat2,
    [f32; 3] => SliderFloat3,
    [f32; 4] => SliderFloat4
}

impl_i32_array! {
    [i32; 2] => SliderInt2,
    [i32; 3] => SliderInt3,
    [i32; 4] => SliderInt4
}