change(widget): make height adjustable at widget level

addtionally rename Progressbar to ProgressBar

examples/progressbar.rs

@@ -1,63 +0,0 @@
-use iced::{
-    settings::Window, slider, Background, Color, Column, Element, Sandbox,
-    Settings, Slider,
-};
-use iced_winit::Progressbar;
-
-pub fn main() {
-    Progress::run(Settings {
-        window: Window {
-            size: (700, 300),
-            resizable: true,
-            decorations: true,
-        },
-    })
-}
-
-#[derive(Default)]
-struct Progress {
-    value: f32,
-    progressbar_slider: slider::State,
-}
-
-#[derive(Debug, Clone, Copy)]
-enum Message {
-    SliderChanged(f32),
-}
-
-impl Sandbox for Progress {
-    type Message = Message;
-
-    fn new() -> Self {
-        Self::default()
-    }
-
-    fn title(&self) -> String {
-        String::from("A simple Progressbar")
-    }
-
-    fn update(&mut self, message: Message) {
-        match message {
-            Message::SliderChanged(x) => self.value = x,
-        }
-    }
-
-    fn view(&mut self) -> Element<Message> {
-        Column::new()
-            .padding(20)
-            .push(
-                Progressbar::new(0.0..=100.0, self.value)
-                    .background(Background::Color(Color::from_rgb(
-                        0.6, 0.6, 0.6,
-                    )))
-                    .active_color(Color::from_rgb(0.0, 0.95, 0.0)),
-            )
-            .push(Slider::new(
-                &mut self.progressbar_slider,
-                0.0..=100.0,
-                self.value,
-                Message::SliderChanged,
-            ))
-            .into()
-    }
-}