add offset / scrolling + clipboard support

src/testing/input.rs

@@ -3,7 +3,7 @@ use ui::{
     layout::Vec2,
 };
 use winit::{
-    event::{MouseButton, WindowEvent},
+    event::{MouseButton, MouseScrollDelta, WindowEvent},
     keyboard::{Key, NamedKey},
 };
 
@@ -32,6 +32,13 @@ impl Input {
                     _ => (),
                 }
             }
+            WindowEvent::MouseWheel { delta, .. } => {
+                let delta = match *delta {
+                    MouseScrollDelta::LineDelta(x, y) => Vec2::new(x, y),
+                    MouseScrollDelta::PixelDelta(pos) => Vec2::new(pos.x as f32, pos.y as f32),
+                };
+                self.cursor.scroll_delta = delta;
+            }
             WindowEvent::CursorLeft { .. } => {
                 self.cursor.exists = false;
                 self.modifiers.clear();
@@ -56,7 +63,7 @@ impl Input {
     }
 
     pub fn end_frame(&mut self) {
-        self.cursor.buttons.end_frame();
+        self.cursor.end_frame();
     }
 }