Add multidirectional scrolling capabilities to the existing Scrollable.

Author: bungoboingo

core/src/size.rs

@@ -1,5 +1,4 @@
 use crate::{Padding, Vector};
-use std::f32;
 
 /// An amount of space in 2 dimensions.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]

examples/README.md

@@ -99,7 +99,7 @@ A bunch of simpler examples exist:
 - [`pick_list`](pick_list), a dropdown list of selectable options.
 - [`pokedex`](pokedex), an application that displays a random Pokédex entry (sprite included!) by using the [PokéAPI].
 - [`progress_bar`](progress_bar), a simple progress bar that can be filled by using a slider.
-- [`scrollable`](scrollable), a showcase of the various scrollbar width options.
+- [`scrollable`](scrollable), a showcase of various scrollable content configurations.
 - [`sierpinski_triangle`](sierpinski_triangle), a [sierpiński triangle](https://en.wikipedia.org/wiki/Sierpi%C5%84ski_triangle) Emulator, use `Canvas` and `Slider`.
 - [`solar_system`](solar_system), an animated solar system drawn using the `Canvas` widget and showcasing how to compose different transforms.
 - [`stopwatch`](stopwatch), a watch with start/stop and reset buttons showcasing how to listen to time.

examples/scrollable/Cargo.toml

@@ -7,3 +7,4 @@ publish = false
 
 [dependencies]
 iced = { path = "../..", features = ["debug"] }
+lazy_static = "1.4"