Take `Event` by reference in `Widget::update`

35 files changed, 86 insertions, 122 deletions

diff --git a/widget/src/button.rs b/widget/src/button.rs
index 11839d5e..0e24328f 100644
--- a/widget/src/button.rs
+++ b/widget/src/button.rs
@@ -275,7 +275,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -285,7 +285,7 @@ where
     ) {
         self.content.as_widget_mut().update(
             &mut tree.children[0],
-            event.clone(),
+            event,
             layout.children().next().unwrap(),
             cursor,
             renderer,
diff --git a/widget/src/canvas.rs b/widget/src/canvas.rs
index d10771f0..046abddf 100644
--- a/widget/src/canvas.rs
+++ b/widget/src/canvas.rs
@@ -218,7 +218,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
diff --git a/widget/src/canvas/program.rs b/widget/src/canvas/program.rs
index c68b2830..43446b64 100644
--- a/widget/src/canvas/program.rs
+++ b/widget/src/canvas/program.rs
@@ -32,7 +32,7 @@ where
     fn update(
         &self,
         _state: &mut Self::State,
-        _event: Event,
+        _event: &Event,
         _bounds: Rectangle,
         _cursor: mouse::Cursor,
     ) -> Option<Action<Message>> {
@@ -82,7 +82,7 @@ where
     fn update(
         &self,
         state: &mut Self::State,
-        event: Event,
+        event: &Event,
         bounds: Rectangle,
         cursor: mouse::Cursor,
     ) -> Option<Action<Message>> {
diff --git a/widget/src/checkbox.rs b/widget/src/checkbox.rs
index 663bfad1..6ed3e080 100644
--- a/widget/src/checkbox.rs
+++ b/widget/src/checkbox.rs
@@ -305,7 +305,7 @@ where
     fn update(
         &mut self,
         _tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         _renderer: &Renderer,
diff --git a/widget/src/column.rs b/widget/src/column.rs
index c729cbdb..7200690b 100644
--- a/widget/src/column.rs
+++ b/widget/src/column.rs
@@ -260,7 +260,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -275,13 +275,7 @@ where
             .zip(layout.children())
         {
             child.as_widget_mut().update(
-                state,
-                event.clone(),
-                layout,
-                cursor,
-                renderer,
-                clipboard,
-                shell,
+                state, event, layout, cursor, renderer, clipboard, shell,
                 viewport,
             );
         }
diff --git a/widget/src/combo_box.rs b/widget/src/combo_box.rs
index 05793155..f71e4a6e 100644
--- a/widget/src/combo_box.rs
+++ b/widget/src/combo_box.rs
@@ -512,7 +512,7 @@ where
     fn update(
         &mut self,
         tree: &mut widget::Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -540,7 +540,7 @@ where
         // Provide it to the widget
         self.text_input.update(
             &mut tree.children[0],
-            event.clone(),
+            event,
             layout,
             cursor,
             renderer,
@@ -737,7 +737,7 @@ where
                 let mut local_shell = Shell::new(&mut local_messages);
                 self.text_input.update(
                     &mut tree.children[0],
-                    Event::Mouse(mouse::Event::ButtonPressed(
+                    &Event::Mouse(mouse::Event::ButtonPressed(
                         mouse::Button::Left,
                     )),
                     layout,
diff --git a/widget/src/container.rs b/widget/src/container.rs
index 852481f1..82dc3141 100644
--- a/widget/src/container.rs
+++ b/widget/src/container.rs
@@ -300,7 +300,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
diff --git a/widget/src/helpers.rs b/widget/src/helpers.rs
index 199b8fc0..4cba197d 100644
--- a/widget/src/helpers.rs
+++ b/widget/src/helpers.rs
@@ -633,7 +633,7 @@ where
         fn update(
             &mut self,
             state: &mut Tree,
-            event: Event,
+            event: &Event,
             layout: Layout<'_>,
             cursor: mouse::Cursor,
             renderer: &Renderer,
@@ -836,7 +836,7 @@ where
         fn update(
             &mut self,
             tree: &mut Tree,
-            event: Event,
+            event: &Event,
             layout: Layout<'_>,
             cursor: mouse::Cursor,
             renderer: &Renderer,
@@ -885,14 +885,8 @@ where
                 let redraw_request = shell.redraw_request();
 
                 self.top.as_widget_mut().update(
-                    top_tree,
-                    event.clone(),
-                    top_layout,
-                    cursor,
-                    renderer,
-                    clipboard,
-                    shell,
-                    viewport,
+                    top_tree, event, top_layout, cursor, renderer, clipboard,
+                    shell, viewport,
                 );
 
                 // Ignore redraw requests of invisible content
@@ -907,7 +901,7 @@ where
 
             self.base.as_widget_mut().update(
                 base_tree,
-                event.clone(),
+                event,
                 base_layout,
                 cursor,
                 renderer,
diff --git a/widget/src/image/viewer.rs b/widget/src/image/viewer.rs
index 20a7955f..06652ff7 100644
--- a/widget/src/image/viewer.rs
+++ b/widget/src/image/viewer.rs
@@ -151,7 +151,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -167,7 +167,7 @@ where
                     return;
                 };
 
-                match delta {
+                match *delta {
                     mouse::ScrollDelta::Lines { y, .. }
                     | mouse::ScrollDelta::Pixels { y, .. } => {
                         let state = tree.state.downcast_mut::<State>();
@@ -256,7 +256,7 @@ where
                         .max(0.0)
                         .round();
 
-                    let delta = position - origin;
+                    let delta = *position - origin;
 
                     let x = if bounds.width < scaled_size.width {
                         (state.starting_offset.x - delta.x)
diff --git a/widget/src/keyed/column.rs b/widget/src/keyed/column.rs
index ab0b0bde..313b728a 100644
--- a/widget/src/keyed/column.rs
+++ b/widget/src/keyed/column.rs
@@ -300,7 +300,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -315,13 +315,7 @@ where
             .zip(layout.children())
         {
             child.as_widget_mut().update(
-                state,
-                event.clone(),
-                layout,
-                cursor,
-                renderer,
-                clipboard,
-                shell,
+                state, event, layout, cursor, renderer, clipboard, shell,
                 viewport,
             );
         }
diff --git a/widget/src/lazy.rs b/widget/src/lazy.rs
index c6710e30..6df026de 100644
--- a/widget/src/lazy.rs
+++ b/widget/src/lazy.rs
@@ -198,7 +198,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -386,7 +386,7 @@ where
 
     fn update(
         &mut self,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
diff --git a/widget/src/lazy/component.rs b/widget/src/lazy/component.rs
index c93b7c42..30822b7d 100644
--- a/widget/src/lazy/component.rs
+++ b/widget/src/lazy/component.rs
@@ -313,7 +313,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: core::Event,
+        event: &core::Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -593,7 +593,7 @@ where
 
     fn update(
         &mut self,
-        event: core::Event,
+        event: &core::Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
diff --git a/widget/src/lazy/responsive.rs b/widget/src/lazy/responsive.rs
index 8129336e..e7c937af 100644
--- a/widget/src/lazy/responsive.rs
+++ b/widget/src/lazy/responsive.rs
@@ -188,7 +188,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -416,7 +416,7 @@ where
 
     fn update(
         &mut self,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
diff --git a/widget/src/mouse_area.rs b/widget/src/mouse_area.rs
index 9ba3cff5..c1c3ba0f 100644
--- a/widget/src/mouse_area.rs
+++ b/widget/src/mouse_area.rs
@@ -218,7 +218,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -228,7 +228,7 @@ where
     ) {
         self.content.as_widget_mut().update(
             &mut tree.children[0],
-            event.clone(),
+            event,
             layout,
             cursor,
             renderer,
@@ -326,7 +326,7 @@ where
 fn update<Message: Clone, Theme, Renderer>(
     widget: &mut MouseArea<'_, Message, Theme, Renderer>,
     tree: &mut Tree,
-    event: Event,
+    event: &Event,
     layout: Layout<'_>,
     cursor: mouse::Cursor,
     shell: &mut Shell<'_, Message>,
@@ -425,7 +425,7 @@ fn update<Message: Clone, Theme, Renderer>(
         }
         Event::Mouse(mouse::Event::WheelScrolled { delta }) => {
             if let Some(on_scroll) = widget.on_scroll.as_ref() {
-                shell.publish(on_scroll(delta));
+                shell.publish(on_scroll(*delta));
                 shell.capture_event();
             }
         }
diff --git a/widget/src/overlay/menu.rs b/widget/src/overlay/menu.rs
index 611476ce..9d0539ff 100644
--- a/widget/src/overlay/menu.rs
+++ b/widget/src/overlay/menu.rs
@@ -263,7 +263,7 @@ where
 
     fn update(
         &mut self,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -388,7 +388,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
diff --git a/widget/src/pane_grid.rs b/widget/src/pane_grid.rs
index e972b983..3ae1dfc7 100644
--- a/widget/src/pane_grid.rs
+++ b/widget/src/pane_grid.rs
@@ -474,7 +474,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -509,15 +509,8 @@ where
             let is_picked = picked_pane == Some(pane);
 
             content.update(
-                tree,
-                event.clone(),
-                layout,
-                cursor,
-                renderer,
-                clipboard,
-                shell,
-                viewport,
-                is_picked,
+                tree, event, layout, cursor, renderer, clipboard, shell,
+                viewport, is_picked,
             );
         }
 
diff --git a/widget/src/pane_grid/content.rs b/widget/src/pane_grid/content.rs
index be5e5066..4d63dd18 100644
--- a/widget/src/pane_grid/content.rs
+++ b/widget/src/pane_grid/content.rs
@@ -242,7 +242,7 @@ where
     pub(crate) fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -256,7 +256,7 @@ where
 
             title_bar.update(
                 &mut tree.children[1],
-                event.clone(),
+                event,
                 children.next().unwrap(),
                 cursor,
                 renderer,
diff --git a/widget/src/pane_grid/title_bar.rs b/widget/src/pane_grid/title_bar.rs
index 4bd2c2f6..611c3d67 100644
--- a/widget/src/pane_grid/title_bar.rs
+++ b/widget/src/pane_grid/title_bar.rs
@@ -430,7 +430,7 @@ where
     pub(crate) fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -456,7 +456,7 @@ where
 
                     compact.as_widget_mut().update(
                         &mut tree.children[2],
-                        event.clone(),
+                        event,
                         compact_layout,
                         cursor,
                         renderer,
@@ -469,7 +469,7 @@ where
 
                     controls.full.as_widget_mut().update(
                         &mut tree.children[1],
-                        event.clone(),
+                        event,
                         controls_layout,
                         cursor,
                         renderer,
@@ -481,7 +481,7 @@ where
             } else {
                 controls.full.as_widget_mut().update(
                     &mut tree.children[1],
-                    event.clone(),
+                    event,
                     controls_layout,
                     cursor,
                     renderer,
diff --git a/widget/src/pick_list.rs b/widget/src/pick_list.rs
index 6708e7cd..b751fcc3 100644
--- a/widget/src/pick_list.rs
+++ b/widget/src/pick_list.rs
@@ -430,7 +430,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         _renderer: &Renderer,
@@ -489,13 +489,13 @@ where
                     let options = self.options.borrow();
                     let selected = self.selected.as_ref().map(Borrow::borrow);
 
-                    let next_option = if y < 0.0 {
+                    let next_option = if *y < 0.0 {
                         if let Some(selected) = selected {
                             find_next(selected, options.iter())
                         } else {
                             options.first()
                         }
-                    } else if y > 0.0 {
+                    } else if *y > 0.0 {
                         if let Some(selected) = selected {
                             find_next(selected, options.iter().rev())
                         } else {
@@ -513,7 +513,7 @@ where
                 }
             }
             Event::Keyboard(keyboard::Event::ModifiersChanged(modifiers)) => {
-                state.keyboard_modifiers = modifiers;
+                state.keyboard_modifiers = *modifiers;
             }
             _ => {}
         };
diff --git a/widget/src/pin.rs b/widget/src/pin.rs
index 7c1aca61..afa29398 100644
--- a/widget/src/pin.rs
+++ b/widget/src/pin.rs
@@ -177,7 +177,7 @@ where
     fn update(
         &mut self,
         tree: &mut widget::Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
diff --git a/widget/src/pop.rs b/widget/src/pop.rs
index 146cfb2b..6e9df4be 100644
--- a/widget/src/pop.rs
+++ b/widget/src/pop.rs
@@ -108,7 +108,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
diff --git a/widget/src/radio.rs b/widget/src/radio.rs
index 15c983df..0df4d715 100644
--- a/widget/src/radio.rs
+++ b/widget/src/radio.rs
@@ -326,7 +326,7 @@ where
     fn update(
         &mut self,
         _state: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         _renderer: &Renderer,
diff --git a/widget/src/row.rs b/widget/src/row.rs
index 3b605f07..5ffeab49 100644
--- a/widget/src/row.rs
+++ b/widget/src/row.rs
@@ -256,7 +256,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -271,13 +271,7 @@ where
             .zip(layout.children())
         {
             child.as_widget_mut().update(
-                state,
-                event.clone(),
-                layout,
-                cursor,
-                renderer,
-                clipboard,
-                shell,
+                state, event, layout, cursor, renderer, clipboard, shell,
                 viewport,
             );
         }
@@ -495,7 +489,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
diff --git a/widget/src/scrollable.rs b/widget/src/scrollable.rs
index a51a8625..8adf5136 100644
--- a/widget/src/scrollable.rs
+++ b/widget/src/scrollable.rs
@@ -517,7 +517,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -736,7 +736,7 @@ where
 
                 self.content.as_widget_mut().update(
                     &mut tree.children[0],
-                    event.clone(),
+                    event,
                     content,
                     cursor,
                     renderer,
@@ -781,7 +781,7 @@ where
                 modifiers,
             )) = event
             {
-                state.keyboard_modifiers = modifiers;
+                state.keyboard_modifiers = *modifiers;
 
                 return;
             }
@@ -792,7 +792,7 @@ where
                         return;
                     }
 
-                    let delta = match delta {
+                    let delta = match *delta {
                         mouse::ScrollDelta::Lines { x, y } => {
                             let is_shift_pressed =
                                 state.keyboard_modifiers.shift();
diff --git a/widget/src/shader.rs b/widget/src/shader.rs
index 48c96321..06254a1c 100644
--- a/widget/src/shader.rs
+++ b/widget/src/shader.rs
@@ -88,7 +88,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: crate::core::Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         _renderer: &Renderer,
@@ -174,7 +174,7 @@ where
     fn update(
         &self,
         state: &mut Self::State,
-        event: Event,
+        event: &Event,
         bounds: Rectangle,
         cursor: mouse::Cursor,
     ) -> Option<Action<Message>> {
diff --git a/widget/src/shader/program.rs b/widget/src/shader/program.rs
index 0fc110af..81ecc9b1 100644
--- a/widget/src/shader/program.rs
+++ b/widget/src/shader/program.rs
@@ -26,7 +26,7 @@ pub trait Program<Message> {
     fn update(
         &self,
         _state: &mut Self::State,
-        _event: shader::Event,
+        _event: &shader::Event,
         _bounds: Rectangle,
         _cursor: mouse::Cursor,
     ) -> Option<Action<Message>> {
diff --git a/widget/src/slider.rs b/widget/src/slider.rs
index 52500854..1908abc9 100644
--- a/widget/src/slider.rs
+++ b/widget/src/slider.rs
@@ -245,7 +245,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         _renderer: &Renderer,
diff --git a/widget/src/stack.rs b/widget/src/stack.rs
index d5cf1ecf..df9f6162 100644
--- a/widget/src/stack.rs
+++ b/widget/src/stack.rs
@@ -207,7 +207,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         mut cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -227,13 +227,7 @@ where
             .enumerate()
         {
             child.as_widget_mut().update(
-                state,
-                event.clone(),
-                layout,
-                cursor,
-                renderer,
-                clipboard,
-                shell,
+                state, event, layout, cursor, renderer, clipboard, shell,
                 viewport,
             );
 
diff --git a/widget/src/text/rich.rs b/widget/src/text/rich.rs
index 0b499ec6..a9e544d1 100644
--- a/widget/src/text/rich.rs
+++ b/widget/src/text/rich.rs
@@ -358,7 +358,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         _renderer: &Renderer,
diff --git a/widget/src/text_editor.rs b/widget/src/text_editor.rs
index cfdf6b5d..e685256b 100644
--- a/widget/src/text_editor.rs
+++ b/widget/src/text_editor.rs
@@ -651,7 +651,7 @@ where
     fn update(
         &mut self,
         tree: &mut widget::Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -686,17 +686,18 @@ where
             Event::Window(window::Event::RedrawRequested(now)) => {
                 if let Some(focus) = &mut state.focus {
                     if focus.is_window_focused {
-                        focus.now = now;
+                        focus.now = *now;
 
                         let millis_until_redraw =
                             Focus::CURSOR_BLINK_INTERVAL_MILLIS
-                                - (now - focus.updated_at).as_millis()
+                                - (focus.now - focus.updated_at).as_millis()
                                     % Focus::CURSOR_BLINK_INTERVAL_MILLIS;
 
                         shell.request_redraw_at(
-                            now + Duration::from_millis(
-                                millis_until_redraw as u64,
-                            ),
+                            focus.now
+                                + Duration::from_millis(
+                                    millis_until_redraw as u64,
+                                ),
                         );
                     }
                 }
@@ -1216,7 +1217,7 @@ enum Ime {
 
 impl<Message> Update<Message> {
     fn from_event<H: Highlighter>(
-        event: Event,
+        event: &Event,
         state: &State<H>,
         bounds: Rectangle,
         padding: Padding,
@@ -1284,14 +1285,14 @@ impl<Message> Update<Message> {
                     if state.focus.is_some() =>
                 {
                     Some(Update::InputMethod(Ime::Preedit {
-                        content,
-                        selection,
+                        content: content.clone(),
+                        selection: selection.clone(),
                     }))
                 }
                 input_method::Event::Commit(content)
                     if state.focus.is_some() =>
                 {
-                    Some(Update::InputMethod(Ime::Commit(content)))
+                    Some(Update::InputMethod(Ime::Commit(content.clone())))
                 }
                 _ => None,
             },
@@ -1310,9 +1311,9 @@ impl<Message> Update<Message> {
                 };
 
                 let key_press = KeyPress {
-                    key,
-                    modifiers,
-                    text,
+                    key: key.clone(),
+                    modifiers: *modifiers,
+                    text: text.clone(),
                     status,
                 };
 
diff --git a/widget/src/text_input.rs b/widget/src/text_input.rs
index b22ee1ca..215ecbd6 100644
--- a/widget/src/text_input.rs
+++ b/widget/src/text_input.rs
@@ -692,7 +692,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
diff --git a/widget/src/themer.rs b/widget/src/themer.rs
index 769cc4ca..4e583882 100644
--- a/widget/src/themer.rs
+++ b/widget/src/themer.rs
@@ -113,7 +113,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
@@ -220,7 +220,7 @@ where
 
             fn update(
                 &mut self,
-                event: Event,
+                event: &Event,
                 layout: Layout<'_>,
                 cursor: mouse::Cursor,
                 renderer: &Renderer,
diff --git a/widget/src/toggler.rs b/widget/src/toggler.rs
index 56c2be1f..b711432e 100644
--- a/widget/src/toggler.rs
+++ b/widget/src/toggler.rs
@@ -309,7 +309,7 @@ where
     fn update(
         &mut self,
         _state: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         _renderer: &Renderer,
diff --git a/widget/src/tooltip.rs b/widget/src/tooltip.rs
index a0ffe392..5bebeeac 100644
--- a/widget/src/tooltip.rs
+++ b/widget/src/tooltip.rs
@@ -192,7 +192,7 @@ where
     fn update(
         &mut self,
         tree: &mut widget::Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         renderer: &Renderer,
diff --git a/widget/src/vertical_slider.rs b/widget/src/vertical_slider.rs
index 2ed9419a..6f878fde 100644
--- a/widget/src/vertical_slider.rs
+++ b/widget/src/vertical_slider.rs
@@ -249,7 +249,7 @@ where
     fn update(
         &mut self,
         tree: &mut Tree,
-        event: Event,
+        event: &Event,
         layout: Layout<'_>,
         cursor: mouse::Cursor,
         _renderer: &Renderer,
@@ -379,7 +379,7 @@ where
                 if state.keyboard_modifiers.control() =>
             {
                 if cursor.is_over(layout.bounds()) {
-                    let delta = match delta {
+                    let delta = match *delta {
                         mouse::ScrollDelta::Lines { x: _, y } => y,
                         mouse::ScrollDelta::Pixels { x: _, y } => y,
                     };
@@ -411,7 +411,7 @@ where
                 }
             }
             Event::Keyboard(keyboard::Event::ModifiersChanged(modifiers)) => {
-                state.keyboard_modifiers = modifiers;
+                state.keyboard_modifiers = *modifiers;
             }
             _ => {}
         }