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use color::{Color, Colorable};
use elmesque::Element;
use frame::Frameable;
use graphics::character::CharacterCache;
use graphics::math::Scalar;
use label::{FontSize, Labelable};
use mouse::Mouse;
use num::{Float, NumCast, ToPrimitive};
use theme::Theme;
use ui::GlyphCache;
use utils::{clamp, percentage, value_from_perc};
use widget::{self, Widget};
pub struct Slider<'a, T, F> {
common: widget::CommonBuilder,
value: T,
min: T,
max: T,
skew: f32,
maybe_react: Option<F>,
maybe_label: Option<&'a str>,
style: Style,
enabled: bool,
}
#[allow(missing_docs, missing_copy_implementations)]
#[derive(Clone, Debug, PartialEq, RustcEncodable, RustcDecodable)]
pub struct Style {
pub maybe_color: Option<Color>,
pub maybe_frame: Option<Scalar>,
pub maybe_frame_color: Option<Color>,
pub maybe_label_color: Option<Color>,
pub maybe_label_font_size: Option<u32>,
}
#[derive(Clone, Debug, PartialEq)]
pub struct State<T> {
value: T,
min: T,
max: T,
skew: f32,
maybe_label: Option<String>,
interaction: Interaction,
}
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum Interaction {
Normal,
Highlighted,
Clicked,
}
impl<T> State<T> {
fn color(&self, color: Color) -> Color {
match self.interaction {
Interaction::Normal => color,
Interaction::Highlighted => color.highlighted(),
Interaction::Clicked => color.clicked(),
}
}
}
fn get_new_interaction(is_over: bool, prev: Interaction, mouse: Mouse) -> Interaction {
use mouse::ButtonState::{Down, Up};
use self::Interaction::{Normal, Highlighted, Clicked};
match (is_over, prev, mouse.left) {
(true, Normal, Down) => Normal,
(true, _, Down) => Clicked,
(true, _, Up) => Highlighted,
(false, Clicked, Down) => Clicked,
_ => Normal,
}
}
impl<'a, T, F> Slider<'a, T, F> {
pub fn new(value: T, min: T, max: T) -> Slider<'a, T, F> {
Slider {
common: widget::CommonBuilder::new(),
value: value,
min: min,
max: max,
skew: 1.0,
maybe_react: None,
maybe_label: None,
style: Style::new(),
enabled: true,
}
}
pub fn skew(mut self, skew: f32) -> Slider<'a, T, F> {
self.skew = skew;
self
}
pub fn react(mut self, reaction: F) -> Slider<'a, T, F> {
self.maybe_react = Some(reaction);
self
}
pub fn enabled(mut self, flag: bool) -> Self {
self.enabled = flag;
self
}
}
impl<'a, T, F> Widget for Slider<'a, T, F>
where
F: FnMut(T),
T: ::std::any::Any + ::std::fmt::Debug + Float + NumCast + ToPrimitive,
{
type State = State<T>;
type Style = Style;
fn common(&self) -> &widget::CommonBuilder { &self.common }
fn common_mut(&mut self) -> &mut widget::CommonBuilder { &mut self.common }
fn unique_kind(&self) -> &'static str { "Slider" }
fn init_state(&self) -> State<T> {
State {
value: self.value,
min: self.min,
max: self.max,
skew: self.skew,
maybe_label: None,
interaction: Interaction::Normal,
}
}
fn style(&self) -> Style { self.style.clone() }
fn capture_mouse(prev: &State<T>, new: &State<T>) -> bool {
match (prev.interaction, new.interaction) {
(Interaction::Highlighted, Interaction::Clicked) => true,
_ => false,
}
}
fn uncapture_mouse(prev: &State<T>, new: &State<T>) -> bool {
match (prev.interaction, new.interaction) {
(Interaction::Clicked, Interaction::Highlighted) => true,
(Interaction::Clicked, Interaction::Normal) => true,
_ => false,
}
}
fn default_width<C: CharacterCache>(&self, theme: &Theme, _: &GlyphCache<C>) -> Scalar {
const DEFAULT_WIDTH: Scalar = 192.0;
self.common.maybe_width.or(theme.maybe_slider.as_ref().map(|default| {
default.common.maybe_width.unwrap_or(DEFAULT_WIDTH)
})).unwrap_or(DEFAULT_WIDTH)
}
fn default_height(&self, theme: &Theme) -> Scalar {
const DEFAULT_HEIGHT: Scalar = 48.0;
self.common.maybe_height.or(theme.maybe_slider.as_ref().map(|default| {
default.common.maybe_height.unwrap_or(DEFAULT_HEIGHT)
})).unwrap_or(DEFAULT_HEIGHT)
}
fn update<'b, 'c, C>(mut self, args: widget::UpdateArgs<'b, 'c, Self, C>) -> Option<State<T>>
where C: CharacterCache,
{
use utils::{is_over_rect, map_range};
let widget::UpdateArgs { prev_state, xy, dim, input, style, theme, .. } = args;
let widget::State { ref state, .. } = *prev_state;
let maybe_mouse = input.maybe_mouse.map(|mouse| mouse.relative_to(xy));
let new_interaction = match (self.enabled, maybe_mouse) {
(false, _) | (true, None) => Interaction::Normal,
(true, Some(mouse)) => {
let is_over = is_over_rect([0.0, 0.0], mouse.xy, dim);
get_new_interaction(is_over, state.interaction, mouse)
},
};
let new_value = if let Some(mouse) = maybe_mouse {
let Slider { value, min, max, skew, .. } = self;
let frame = style.frame(theme);
let frame_2 = frame * 2.0;
let (inner_w, inner_h) = (dim[0] - frame_2, dim[1] - frame_2);
let (half_inner_w, half_inner_h) = (inner_w / 2.0, inner_h / 2.0);
let is_horizontal = dim[0] > dim[1];
if is_horizontal {
let w_perc = match (state.interaction, new_interaction) {
(Interaction::Highlighted, Interaction::Clicked) |
(Interaction::Clicked, Interaction::Clicked) => {
let w = map_range(mouse.xy[0], -half_inner_w, half_inner_w, 0.0, inner_w);
let perc = clamp(w, 0.0, inner_w) / inner_w;
(perc).powf(skew as f64)
},
_ => {
let value_percentage = percentage(value, min, max);
let w = clamp(value_percentage as f64 * inner_w, 0.0, inner_w);
(w / inner_w)
},
};
value_from_perc(w_perc as f32, min, max)
} else {
let h_perc = match (state.interaction, new_interaction) {
(Interaction::Highlighted, Interaction::Clicked) |
(Interaction::Clicked, Interaction::Clicked) => {
let h = map_range(mouse.xy[1], -half_inner_h, half_inner_h, 0.0, inner_h);
let perc = clamp(h, 0.0, inner_h) / inner_h;
(perc).powf(skew as f64)
},
_ => {
let value_percentage = percentage(value, min, max);
let h = clamp(value_percentage as f64 * inner_h, 0.0, inner_h);
(h / inner_h)
},
};
value_from_perc(h_perc as f32, min, max)
}
} else {
self.value
};
match self.maybe_react {
Some(ref mut react) => {
if self.value != new_value || match (state.interaction, new_interaction) {
(Interaction::Highlighted, Interaction::Clicked) |
(Interaction::Clicked, Interaction::Highlighted) => true,
_ => false,
} { react(new_value) }
}, None => (),
}
let new_state = || {
State {
interaction: new_interaction,
value: self.value,
min: self.min,
max: self.max,
skew: self.skew,
maybe_label: self.maybe_label.as_ref().map(|label| label.to_string()),
}
};
let state_has_changed = state.interaction != new_interaction
|| state.value != self.value
|| state.min != self.min || state.max != self.max
|| state.skew != self.skew
|| state.maybe_label.as_ref().map(|string| &string[..]) != self.maybe_label;
if state_has_changed { Some(new_state()) } else { None }
}
fn draw<'b, C>(args: widget::DrawArgs<'b, Self, C>) -> Element
where C: CharacterCache,
{
use elmesque::form::{collage, rect, text};
let widget::DrawArgs { state, style, theme, glyph_cache } = args;
let widget::State { ref state, dim, xy, .. } = *state;
let frame = style.frame(theme);
let (inner_w, inner_h) = (dim[0] - frame * 2.0, dim[1] - frame * 2.0);
let frame_color = state.color(style.frame_color(theme));
let color = state.color(style.color(theme));
let new_value = NumCast::from(state.value).unwrap();
let is_horizontal = dim[0] > dim[1];
let (pad_rel_xy, pad_dim) = if is_horizontal {
let value_percentage = percentage(new_value, state.min, state.max).powf(1.0/state.skew);
let w = clamp(value_percentage as f64 * inner_w, 0.0, inner_w);
let rel_xy = [-(inner_w - w) / 2.0, 0.0];
(rel_xy, [w, inner_h])
} else {
let value_percentage = percentage(new_value, state.min, state.max).powf(1.0/state.skew);
let h = clamp(value_percentage as f64 * inner_h, 0.0, inner_h);
let rel_xy = [0.0, -(inner_h - h) / 2.0];
(rel_xy, [inner_w, h])
};
let frame_form = rect(dim[0], dim[1])
.filled(frame_color);
let pad_form = rect(pad_dim[0], pad_dim[1])
.filled(color)
.shift(pad_rel_xy[0], pad_rel_xy[1]);
let maybe_label_form = state.maybe_label.as_ref().map(|label_text| {
use elmesque::text::Text;
use position;
const TEXT_PADDING: f64 = 10.0;
let label_color = style.label_color(theme);
let size = style.label_font_size(theme);
let label_w = glyph_cache.width(size, &label_text);
let is_horizontal = dim[0] > dim[1];
let l_pos = if is_horizontal {
let x = position::align_left_of(dim[0], label_w) + TEXT_PADDING;
[x, 0.0]
} else {
let y = position::align_bottom_of(dim[1], size as f64) + TEXT_PADDING;
[0.0, y]
};
text(Text::from_string(label_text.clone()).color(label_color).height(size as f64))
.shift(l_pos[0].floor(), l_pos[1].floor())
.shift(xy[0].floor(), xy[1].floor())
});
let form_chain = Some(frame_form).into_iter()
.chain(Some(pad_form))
.map(|form| form.shift(xy[0], xy[1]))
.chain(maybe_label_form);
collage(dim[0] as i32, dim[1] as i32, form_chain.collect())
}
}
impl Style {
pub fn new() -> Style {
Style {
maybe_color: None,
maybe_frame: None,
maybe_frame_color: None,
maybe_label_color: None,
maybe_label_font_size: None,
}
}
pub fn color(&self, theme: &Theme) -> Color {
self.maybe_color.or(theme.maybe_slider.as_ref().map(|default| {
default.style.maybe_color.unwrap_or(theme.shape_color)
})).unwrap_or(theme.shape_color)
}
pub fn frame(&self, theme: &Theme) -> f64 {
self.maybe_frame.or(theme.maybe_slider.as_ref().map(|default| {
default.style.maybe_frame.unwrap_or(theme.frame_width)
})).unwrap_or(theme.frame_width)
}
pub fn frame_color(&self, theme: &Theme) -> Color {
self.maybe_frame_color.or(theme.maybe_slider.as_ref().map(|default| {
default.style.maybe_frame_color.unwrap_or(theme.frame_color)
})).unwrap_or(theme.frame_color)
}
pub fn label_color(&self, theme: &Theme) -> Color {
self.maybe_label_color.or(theme.maybe_slider.as_ref().map(|default| {
default.style.maybe_label_color.unwrap_or(theme.label_color)
})).unwrap_or(theme.label_color)
}
pub fn label_font_size(&self, theme: &Theme) -> FontSize {
self.maybe_label_font_size.or(theme.maybe_slider.as_ref().map(|default| {
default.style.maybe_label_font_size.unwrap_or(theme.font_size_medium)
})).unwrap_or(theme.font_size_medium)
}
}
impl<'a, T, F> Colorable for Slider<'a, T, F> {
fn color(mut self, color: Color) -> Self {
self.style.maybe_color = Some(color);
self
}
}
impl<'a, T, F> Frameable for Slider<'a, T, F> {
fn frame(mut self, width: f64) -> Self {
self.style.maybe_frame = Some(width);
self
}
fn frame_color(mut self, color: Color) -> Self {
self.style.maybe_frame_color = Some(color);
self
}
}
impl<'a, T, F> Labelable<'a> for Slider<'a, T, F> {
fn label(mut self, text: &'a str) -> Self {
self.maybe_label = Some(text);
self
}
fn label_color(mut self, color: Color) -> Self {
self.style.maybe_label_color = Some(color);
self
}
fn label_font_size(mut self, size: FontSize) -> Self {
self.style.maybe_label_font_size = Some(size);
self
}
}