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use {
Backend,
CharacterCache,
Color,
Colorable,
FontSize,
Frameable,
Labelable,
IndexSlot,
KidArea,
Padding,
Positionable,
Range,
Rect,
Rectangle,
Scalar,
Text,
Widget,
};
use num::{Float, NumCast, ToPrimitive};
use utils;
use widget;
pub struct RangeSlider<'a, T, F> {
common: widget::CommonBuilder,
start: T,
end: T,
min: T,
max: T,
pub maybe_react: Option<F>,
maybe_label: Option<&'a str>,
style: Style,
}
pub const KIND: widget::Kind = "RangeSlider";
widget_style!{
KIND;
style Style {
- color: Color { theme.shape_color }
- frame: Scalar { theme.frame_width }
- frame_color: Color { theme.frame_color }
- label_color: Color { theme.label_color }
- label_font_size: FontSize { theme.font_size_medium }
}
}
#[derive(Clone, Debug, PartialEq)]
pub struct State {
drag: Option<Drag>,
frame_idx: IndexSlot,
slider_idx: IndexSlot,
label_idx: IndexSlot,
}
#[derive(Copy, Clone, Debug, PartialEq)]
pub enum Drag {
Edge(Edge),
Handle,
}
#[derive(Copy, Clone, Debug, PartialEq)]
pub enum Edge {
Start,
End,
}
impl<'a, T, F> RangeSlider<'a, T, F> {
pub fn new(start: T, end: T, min: T, max: T) -> Self {
RangeSlider {
common: widget::CommonBuilder::new(),
start: start,
end: end,
min: min,
max: max,
maybe_react: None,
maybe_label: None,
style: Style::new(),
}
}
builder_methods!{
pub react { maybe_react = Some(F) }
}
}
impl<'a, T, F> Widget for RangeSlider<'a, T, F>
where F: FnMut(Edge, T),
T: Float + NumCast + ToPrimitive,
{
type State = State;
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 {
KIND
}
fn init_state(&self) -> Self::State {
State {
drag: None,
frame_idx: IndexSlot::new(),
slider_idx: IndexSlot::new(),
label_idx: IndexSlot::new(),
}
}
fn style(&self) -> Style {
self.style.clone()
}
fn kid_area<C: CharacterCache>(&self, args: widget::KidAreaArgs<Self, C>) -> KidArea {
const LABEL_PADDING: Scalar = 10.0;
KidArea {
rect: args.rect,
pad: Padding {
x: Range::new(LABEL_PADDING, LABEL_PADDING),
y: Range::new(LABEL_PADDING, LABEL_PADDING),
},
}
}
fn update<B: Backend>(self, args: widget::UpdateArgs<Self, B>) {
let widget::UpdateArgs { idx, state, rect, style, mut ui, .. } = args;
let RangeSlider { start, end, min, max, maybe_label, maybe_react, .. } = self;
let frame = style.frame(ui.theme());
let inner_rect = rect.pad(frame);
let value_to_x = |v| utils::map_range(v, min, max, inner_rect.left(), inner_rect.right());
let x_to_value = |x| utils::map_range(x, inner_rect.left(), inner_rect.right(), min, max);
let mut maybe_drag = state.drag;
let mut new_start = start;
let mut new_end = utils::clamp(end, start, max);
for widget_event in ui.widget_input(idx).events() {
use event;
use input;
match widget_event {
event::Widget::Press(press) => {
let press_xy = match press.button {
event::Button::Mouse(input::MouseButton::Left, press_xy) => press_xy,
_ => continue,
};
let abs_press_xy = utils::vec2_add(inner_rect.xy(), press_xy);
if inner_rect.is_over(abs_press_xy) {
let start_x = value_to_x(new_start);
let end_x = value_to_x(new_end);
let length_x = end_x - start_x;
let grab_edge_threshold = length_x / 10.0;
let handle_rect = Rect { x: Range::new(start_x, end_x), y: inner_rect.y };
if handle_rect.is_over(abs_press_xy) {
let distance_from_start = (abs_press_xy[0] - start_x).abs();
if distance_from_start < grab_edge_threshold {
maybe_drag = Some(Drag::Edge(Edge::Start));
new_start = x_to_value(abs_press_xy[0]);
continue;
}
let distance_from_end = (end_x - abs_press_xy[0]).abs();
if distance_from_end < grab_edge_threshold {
maybe_drag = Some(Drag::Edge(Edge::End));
new_end = x_to_value(abs_press_xy[0]);
continue;
}
maybe_drag = Some(Drag::Handle);
} else {
let distance_from_start = (abs_press_xy[0] - start_x).abs();
let distance_from_end = (end_x - abs_press_xy[0]).abs();
if distance_from_start < distance_from_end {
maybe_drag = Some(Drag::Edge(Edge::Start));
new_start = x_to_value(abs_press_xy[0]);
} else {
maybe_drag = Some(Drag::Edge(Edge::End));
new_end = x_to_value(abs_press_xy[0]);
}
}
}
},
event::Widget::Drag(drag_event) if drag_event.button == input::MouseButton::Left => {
match maybe_drag {
Some(Drag::Edge(Edge::Start)) => {
let abs_drag_to = inner_rect.x() + drag_event.to[0];
new_start = utils::clamp(x_to_value(abs_drag_to), min, new_end);
},
Some(Drag::Edge(Edge::End)) => {
let abs_drag_to = inner_rect.x() + drag_event.to[0];
new_end = utils::clamp(x_to_value(abs_drag_to), new_start, max);
},
Some(Drag::Handle) => {
let drag_amt = drag_event.delta_xy[0];
let end_x = value_to_x(new_end);
let start_x = value_to_x(new_start);
if drag_amt.is_sign_positive() {
let max_x = inner_rect.right();
let dragged_end = utils::clamp(end_x + drag_amt, end_x, max_x);
let distance_dragged = dragged_end - end_x;
let dragged_start = start_x + distance_dragged;
new_start = x_to_value(dragged_start);
new_end = x_to_value(dragged_end);
} else {
let min_x = inner_rect.left();
let dragged_start = utils::clamp(start_x + drag_amt, min_x, start_x);
let distance_dragged = dragged_start - start_x;
let dragged_end = end_x + distance_dragged;
new_start = x_to_value(dragged_start);
new_end = x_to_value(dragged_end);
}
},
None => (),
}
},
event::Widget::Release(release) => {
if let event::Button::Mouse(input::MouseButton::Left, _) = release.button {
maybe_drag = None;
}
},
_ => (),
}
}
if let Some(mut react) = maybe_react {
if start != new_start {
react(Edge::Start, new_start);
}
if end != new_end {
react(Edge::End, new_end);
}
}
if maybe_drag != state.drag {
state.update(|state| state.drag = maybe_drag);
}
let frame_idx = state.frame_idx.get(&mut ui);
let interaction_color = |ui: &::ui::UiCell<B>, color: Color|
ui.widget_input(idx).mouse()
.map(|mouse| if mouse.buttons.left().is_down() {
color.clicked()
} else {
color.highlighted()
})
.unwrap_or(color);
let frame_color = interaction_color(&ui, style.frame_color(ui.theme()));
Rectangle::fill(rect.dim())
.middle_of(idx)
.graphics_for(idx)
.color(frame_color)
.set(frame_idx, &mut ui);
let start_x = value_to_x(new_start);
let end_x = value_to_x(new_end);
let slider_rect = Rect { x: Range::new(start_x, end_x), y: inner_rect.y };
let color = interaction_color(&ui, style.color(ui.theme()));
let slider_idx = state.slider_idx.get(&mut ui);
let slider_xy_offset = [slider_rect.x() - rect.x(), slider_rect.y() - rect.y()];
Rectangle::fill(slider_rect.dim())
.xy_relative_to(idx, slider_xy_offset)
.graphics_for(idx)
.parent(idx)
.color(color)
.set(slider_idx, &mut ui);
if let Some(label) = maybe_label {
let label_color = style.label_color(ui.theme());
let font_size = style.label_font_size(ui.theme());
let label_idx = state.label_idx.get(&mut ui);
Text::new(label)
.mid_left_of(idx)
.graphics_for(idx)
.color(label_color)
.font_size(font_size)
.set(label_idx, &mut ui);
}
}
}
impl<'a, T, F> Colorable for RangeSlider<'a, T, F> {
builder_method!(color { style.color = Some(Color) });
}
impl<'a, T, F> Frameable for RangeSlider<'a, T, F> {
builder_methods!{
frame { style.frame = Some(Scalar) }
frame_color { style.frame_color = Some(Color) }
}
}
impl<'a, T, F> Labelable<'a> for RangeSlider<'a, T, F> {
builder_methods!{
label { maybe_label = Some(&'a str) }
label_color { style.label_color = Some(Color) }
label_font_size { style.label_font_size = Some(FontSize) }
}
}