xlui 0.2.2

Rust GUI库
Documentation 
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use crate::frame::context::{ContextUpdate, UpdateType};
use crate::frame::App;
use crate::render::circle::param::CircleParam;
use crate::render::rectangle::param::RectParam;
use crate::render::{RenderParam, WrcRender};
use crate::response::{Callback, Response};
use crate::size::border::Border;
use crate::size::pos::Pos;
use crate::size::radius::Radius;
use crate::size::rect::Rect;
use crate::style::color::Color;
use crate::style::ClickStyle;
use crate::ui::Ui;
use crate::widgets::{Widget, WidgetChange, WidgetSize};
use crate::Offset;
use std::ops::Range;
/// ### Slider的示例用法
/// ```
/// use xlui::*;
///
/// fn slider_changed<A:App>(_:&mut A,_:&mut Ui,v:f32){
///     println!("Slider改变了:{}",v);
/// }
///
/// fn draw<A:App>(ui:&mut Ui){
///     //快速创建一个Slider
///     ui.slider(10.0,0.0..100.0)
///         //设置回调函数
///         .set_callback(slider_changed::<A>);
///     let slider=Slider::new(10.0)
///         //关联ID为my_spinbox的控件
///         .contact("my_spinbox")
///         //连接到Slider值监听函数
///         .connect(slider_changed::<A>)
///         //设置控件ID
///         .id("my_slider")
///         //设置Slider值的范围
///         .with_range(0.0..100.0);
///     ui.add(slider);
/// }
/// ```
pub struct Slider {
    pub(crate) id: String,
    rect: Rect,
    value: f32,
    range: Range<f32>,
    callback: Option<Box<dyn FnMut(&mut Box<dyn App>, &mut Ui, f32)>>,
    contact_ids: Vec<String>,

    fill_render: RenderParam<RectParam>,
    slider_render: RenderParam<CircleParam>,
    slided_render: RenderParam<RectParam>,

    focused: bool,
    hovered: bool,
    offset: f32,
    changed: bool,
}


impl Slider {
    pub fn new(v: f32) -> Slider {
        let mut fill_style = ClickStyle::new();
        fill_style.fill.inactive = Color::rgb(220, 220, 220);
        fill_style.fill.hovered = Color::rgb(220, 220, 220);
        fill_style.fill.clicked = Color::rgb(220, 220, 220);
        fill_style.border.inactive = Border::new(0.0).radius(Radius::same(3));
        fill_style.border.hovered = Border::new(0.0).radius(Radius::same(3));
        fill_style.border.clicked = Border::new(0.0).radius(Radius::same(3));

        let mut slider_style = ClickStyle::new();
        slider_style.fill.inactive = Color::rgb(56, 182, 244);
        slider_style.fill.hovered = Color::rgb(56, 182, 244);
        slider_style.fill.clicked = Color::rgb(56, 182, 244);
        slider_style.border.inactive = Border::new(0.0).color(Color::BLACK).radius(Radius::same(8));
        slider_style.border.hovered = Border::new(1.0).color(Color::BLACK).radius(Radius::same(8));
        slider_style.border.clicked = Border::new(1.0).color(Color::BLACK).radius(Radius::same(8));

        let mut slided_style = ClickStyle::new();
        slided_style.fill.inactive = Color::rgb(56, 182, 244);
        slided_style.fill.hovered = Color::rgb(56, 182, 244);
        slided_style.fill.clicked = Color::rgb(56, 182, 244);
        slided_style.border.inactive = Border::new(0.0).radius(Radius::same(3));
        slided_style.border.hovered = Border::new(0.0).radius(Radius::same(3));
        slided_style.border.clicked = Border::new(0.0).radius(Radius::same(3));
        Slider {
            id: crate::gen_unique_id(),
            rect: Rect::new().with_size(130.0, 16.0),
            value: v,
            range: 0.0..1.0,
            callback: None,
            contact_ids: vec![],
            fill_render: RenderParam::new(RectParam::new(Rect::new().with_size(114.0, 6.0), fill_style)),
            slider_render: RenderParam::new(CircleParam::new(Rect::new().with_size(16.0, 16.0), slider_style)),
            slided_render: RenderParam::new(RectParam::new(Rect::new().with_size(114.0, 6.0), slided_style)),
            focused: false,
            hovered: false,
            offset: 0.0,
            changed: false,
        }
    }

    pub fn id(mut self, id: impl ToString) -> Self {
        self.id = id.to_string();
        self
    }

    pub fn connect<A: 'static>(mut self, f: fn(&mut A, &mut Ui, f32)) -> Self {
        self.callback = Some(Callback::create_slider(f));
        self
    }

    pub fn with_range(mut self, range: Range<f32>) -> Self {
        self.range = range;
        self
    }

    pub fn set_callback<A: App>(&mut self, f: fn(&mut A, &mut Ui, f32)) {
        self.callback = Some(Callback::create_slider(f));
    }

    pub fn contact(mut self, id: impl ToString) -> Self {
        self.contact_ids.push(id.to_string());
        self
    }

    fn init(&mut self, ui: &mut Ui) {
        //分配大小
        self.re_init(ui);
    }

    fn re_init(&mut self, ui: &mut Ui) {
        //背景
        self.fill_render.init_rectangle(ui, false, false);
        //已滑动背景
        let scale = self.value / (self.range.end - self.range.start);
        self.slided_render.param.rect.set_width(self.slided_render.param.rect.width() * scale);
        self.slided_render.init_rectangle(ui, false, false);
        //滑块
        self.slider_render.param.rect.set_width(self.rect.height());
        self.offset = self.value * self.fill_render.param.rect.width() / (self.range.end - self.range.start);
        self.slider_render.param.rect.offset_x(&Offset::new(Pos::new()).with_x(self.offset));
        self.slider_render.init_circle(ui, false, false);
    }

    fn update_buffer(&mut self, ui: &mut Ui) {
        if let Some(v) = ui.context.updates.remove(&self.id) {
            v.update_f32(&mut self.value);
            ui.widget_changed |= WidgetChange::Value;
        }
        if self.changed { ui.widget_changed |= WidgetChange::Value; }
        self.changed = false;
        if ui.widget_changed.contains(WidgetChange::Position) {
            self.rect.offset_to_rect(&ui.draw_rect);
            let mut fill_rect = ui.draw_rect.clone();
            fill_rect.contract(8.0, 5.0);
            self.fill_render.param.rect.offset_to_rect(&fill_rect);
            self.fill_render.update(ui, false, false);
            self.slided_render.param.rect.offset_to_rect(&fill_rect);
            self.slided_render.update(ui, false, false);
            let mut slider_rect = ui.draw_rect.clone();
            slider_rect.offset_x(&Offset::new(Pos::new()).with_x(self.offset));

            slider_rect.set_height(ui.draw_rect.height());
            self.slider_render.param.rect.offset_to_rect(&slider_rect);
            self.slider_render.update(ui, self.hovered || self.focused, ui.device.device_input.mouse.pressed);
        }

        if ui.widget_changed.contains(WidgetChange::Value) {
            if self.value >= self.range.end {
                self.value = self.range.end;
            } else if self.value <= self.range.start {
                self.value = self.range.start;
            }
            let scale = self.value / (self.range.end - self.range.start);
            self.slided_render.param.rect.set_width(self.fill_render.param.rect.width() * scale);
            self.slided_render.update(ui, false, false);
            self.slider_render.param.rect = self.rect.clone();
            self.slider_render.param.rect.set_width(self.rect.height());
            let offset = self.value * self.fill_render.param.rect.width() / (self.range.end - self.range.start);
            self.offset = self.slider_render.param.rect.offset_x_limit(offset, self.rect.dx());
            self.slider_render.update(ui, self.hovered || self.focused, ui.device.device_input.mouse.pressed);
            self.fill_render.update(ui, false, false);
        }

    }

    fn redraw(&mut self, ui: &mut Ui) {
        self.update_buffer(ui);
        let pass = ui.pass.as_mut().unwrap();
        ui.context.render.rectangle.render(&self.fill_render, pass);
        ui.context.render.rectangle.render(&self.slided_render, pass);
        ui.context.render.circle.render(&self.slider_render, pass);
    }
}

impl Widget for Slider {


    fn update(&mut self, ui: &mut Ui) -> Response<'_> {
        match ui.update_type {
            UpdateType::Draw => self.redraw(ui),
            UpdateType::Init => self.init(ui),
            UpdateType::ReInit => self.re_init(ui),
            UpdateType::MouseMove => { //滑动
                if self.focused && ui.device.device_input.mouse.pressed {
                    let ox = ui.device.device_input.mouse.lastest.x - self.fill_render.param.rect.dx().min;
                    let mut cl = ox / self.fill_render.param.rect.width();
                    if cl >= 1.0 {
                        self.offset = self.fill_render.param.rect.width();
                        cl = 1.0;
                    } else if cl <= 0.0 {
                        self.offset = 0.0;
                        cl = 0.0;
                    }
                    let cv = (self.range.end - self.range.start) * cl;
                    self.value = self.range.start + cv;
                    self.changed = true;
                    if let Some(ref mut callback) = self.callback {
                        let app = ui.app.take().unwrap();
                        callback(app, ui, self.value);
                        ui.app.replace(app);
                    }
                    ui.send_updates(&self.contact_ids, ContextUpdate::F32(self.value));
                    ui.update_type = UpdateType::None;
                    ui.context.window.request_redraw();
                    return Response::new(&self.id, WidgetSize::same(self.rect.width(), self.rect.height()));
                }
                let hovered = ui.device.device_input.hovered_at(&self.slider_render.param.rect);
                if self.hovered != hovered {
                    self.hovered = hovered;
                    self.changed = true;
                    ui.context.window.request_redraw();
                }
            }
            UpdateType::MousePress => {
                if ui.device.device_input.pressed_at(&self.slider_render.param.rect) != self.focused {
                    self.focused = !self.focused;
                    self.changed = true;
                    ui.context.window.request_redraw();
                }
            }
            UpdateType::MouseRelease => {
                if self.focused {
                    self.focused = false;
                    self.changed = true;
                    ui.context.window.request_redraw();
                }
            }
            _ => {}
        }
        Response::new(&self.id, WidgetSize::same(self.rect.width(), self.rect.height()))
    }
}