Remove `hash_layout` method from `Widget` trait

29 files changed, 91 insertions, 547 deletions

diff --git a/native/src/element.rs b/native/src/element.rs
index 6afa3f62..119b7892 100644
--- a/native/src/element.rs
+++ b/native/src/element.rs
@@ -4,7 +4,7 @@ use crate::mouse;
 use crate::overlay;
 use crate::renderer;
 use crate::{
-    Clipboard, Color, Hasher, Layout, Length, Point, Rectangle, Shell, Widget,
+    Clipboard, Color, Layout, Length, Point, Rectangle, Shell, Widget,
 };
 
 /// A generic [`Widget`].
@@ -269,11 +269,6 @@ where
         )
     }
 
-    /// Computes the _layout_ hash of the [`Element`].
-    pub fn hash_layout(&self, state: &mut Hasher) {
-        self.widget.hash_layout(state);
-    }
-
     /// Returns the overlay of the [`Element`], if there is any.
     pub fn overlay<'b>(
         &'b mut self,
@@ -379,10 +374,6 @@ where
         )
     }
 
-    fn hash_layout(&self, state: &mut Hasher) {
-        self.widget.hash_layout(state);
-    }
-
     fn overlay(
         &mut self,
         layout: Layout<'_>,
@@ -504,10 +495,6 @@ where
         )
     }
 
-    fn hash_layout(&self, state: &mut Hasher) {
-        self.element.widget.hash_layout(state);
-    }
-
     fn overlay(
         &mut self,
         layout: Layout<'_>,
diff --git a/native/src/overlay.rs b/native/src/overlay.rs
index d4b641af..124bcac2 100644
--- a/native/src/overlay.rs
+++ b/native/src/overlay.rs
@@ -10,7 +10,7 @@ use crate::event::{self, Event};
 use crate::layout;
 use crate::mouse;
 use crate::renderer;
-use crate::{Clipboard, Hasher, Layout, Point, Rectangle, Shell, Size};
+use crate::{Clipboard, Layout, Point, Rectangle, Shell, Size};
 
 /// An interactive component that can be displayed on top of other widgets.
 pub trait Overlay<Message, Renderer>
@@ -39,19 +39,6 @@ where
         cursor_position: Point,
     );
 
-    /// Computes the _layout_ hash of the [`Overlay`].
-    ///
-    /// The produced hash is used by the runtime to decide if the [`Layout`]
-    /// needs to be recomputed between frames. Therefore, to ensure maximum
-    /// efficiency, the hash should only be affected by the properties of the
-    /// [`Overlay`] that can affect layouting.
-    ///
-    /// For example, the [`Text`] widget does not hash its color property, as
-    /// its value cannot affect the overall [`Layout`] of the user interface.
-    ///
-    /// [`Text`]: crate::widget::Text
-    fn hash_layout(&self, state: &mut Hasher, position: Point);
-
     /// Processes a runtime [`Event`].
     ///
     /// It receives:
diff --git a/native/src/overlay/element.rs b/native/src/overlay/element.rs
index e7621600..b60881e3 100644
--- a/native/src/overlay/element.rs
+++ b/native/src/overlay/element.rs
@@ -4,7 +4,7 @@ use crate::event::{self, Event};
 use crate::layout;
 use crate::mouse;
 use crate::renderer;
-use crate::{Clipboard, Hasher, Layout, Point, Rectangle, Shell, Size, Vector};
+use crate::{Clipboard, Layout, Point, Rectangle, Shell, Size, Vector};
 
 /// A generic [`Overlay`].
 #[allow(missing_debug_implementations)]
@@ -100,11 +100,6 @@ where
     ) {
         self.overlay.draw(renderer, style, layout, cursor_position)
     }
-
-    /// Computes the _layout_ hash of the [`Element`].
-    pub fn hash_layout(&self, state: &mut Hasher) {
-        self.overlay.hash_layout(state, self.position);
-    }
 }
 
 struct Map<'a, A, B, Renderer> {
@@ -184,8 +179,4 @@ where
     ) {
         self.content.draw(renderer, style, layout, cursor_position)
     }
-
-    fn hash_layout(&self, state: &mut Hasher, position: Point) {
-        self.content.hash_layout(state, position);
-    }
 }
diff --git a/native/src/overlay/menu.rs b/native/src/overlay/menu.rs
index 2deef551..13fa7beb 100644
--- a/native/src/overlay/menu.rs
+++ b/native/src/overlay/menu.rs
@@ -10,8 +10,8 @@ use crate::touch;
 use crate::widget::scrollable::{self, Scrollable};
 use crate::widget::Container;
 use crate::{
-    Clipboard, Color, Element, Hasher, Layout, Length, Padding, Point,
-    Rectangle, Shell, Size, Vector, Widget,
+    Clipboard, Color, Element, Layout, Length, Padding, Point, Rectangle,
+    Shell, Size, Vector, Widget,
 };
 
 pub use iced_style::menu::Style;
@@ -204,17 +204,6 @@ where
         node
     }
 
-    fn hash_layout(&self, state: &mut Hasher, position: Point) {
-        use std::hash::Hash;
-
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        (position.x as u32).hash(state);
-        (position.y as u32).hash(state);
-        self.container.hash_layout(state);
-    }
-
     fn on_event(
         &mut self,
         event: Event,
@@ -320,17 +309,6 @@ where
         layout::Node::new(size)
     }
 
-    fn hash_layout(&self, state: &mut Hasher) {
-        use std::hash::Hash as _;
-
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.options.len().hash(state);
-        self.text_size.hash(state);
-        self.padding.hash(state);
-    }
-
     fn on_event(
         &mut self,
         event: Event,
diff --git a/native/src/user_interface.rs b/native/src/user_interface.rs
index f6ec96bb..00015f8b 100644
--- a/native/src/user_interface.rs
+++ b/native/src/user_interface.rs
@@ -2,12 +2,9 @@
 use crate::event::{self, Event};
 use crate::layout;
 use crate::mouse;
-use crate::overlay;
 use crate::renderer;
 use crate::{Clipboard, Element, Layout, Point, Rectangle, Shell, Size};
 
-use std::hash::Hasher;
-
 /// A set of interactive graphical elements with a specific [`Layout`].
 ///
 /// It can be updated and drawn.
@@ -23,8 +20,8 @@ use std::hash::Hasher;
 #[allow(missing_debug_implementations)]
 pub struct UserInterface<'a, Message, Renderer> {
     root: Element<'a, Message, Renderer>,
-    base: Layer,
-    overlay: Option<Layer>,
+    base: layout::Node,
+    overlay: Option<layout::Node>,
     bounds: Size,
 }
 
@@ -89,41 +86,18 @@ where
     pub fn build<E: Into<Element<'a, Message, Renderer>>>(
         root: E,
         bounds: Size,
-        cache: Cache,
+        _cache: Cache,
         renderer: &mut Renderer,
     ) -> Self {
         let root = root.into();
 
-        let (base, overlay) = {
-            let hash = {
-                let hasher = &mut crate::Hasher::default();
-                root.hash_layout(hasher);
-
-                hasher.finish()
-            };
-
-            let layout_is_cached =
-                hash == cache.base.hash && bounds == cache.bounds;
-
-            let (layout, overlay) = if layout_is_cached {
-                (cache.base.layout, cache.overlay)
-            } else {
-                (
-                    renderer.layout(
-                        &root,
-                        &layout::Limits::new(Size::ZERO, bounds),
-                    ),
-                    None,
-                )
-            };
-
-            (Layer { layout, hash }, overlay)
-        };
+        let base =
+            renderer.layout(&root, &layout::Limits::new(Size::ZERO, bounds));
 
         UserInterface {
             root,
             base,
-            overlay,
+            overlay: None,
             bounds,
         }
     }
@@ -206,16 +180,10 @@ where
         let mut state = State::Updated;
 
         let (base_cursor, overlay_statuses) = if let Some(mut overlay) =
-            self.root.overlay(Layout::new(&self.base.layout), renderer)
+            self.root.overlay(Layout::new(&self.base), renderer)
         {
             let bounds = self.bounds;
-
-            let mut layer = Self::overlay_layer(
-                self.overlay.take(),
-                bounds,
-                &mut overlay,
-                renderer,
-            );
+            let mut layout = overlay.layout(renderer, bounds);
 
             let event_statuses = events
                 .iter()
@@ -225,7 +193,7 @@ where
 
                     let event_status = overlay.on_event(
                         event,
-                        Layout::new(&layer.layout),
+                        Layout::new(&layout),
                         cursor_position,
                         renderer,
                         clipboard,
@@ -233,12 +201,7 @@ where
                     );
 
                     shell.revalidate_layout(|| {
-                        layer = Self::overlay_layer(
-                            None,
-                            bounds,
-                            &mut overlay,
-                            renderer,
-                        );
+                        layout = overlay.layout(renderer, bounds);
                     });
 
                     if shell.are_widgets_invalid() {
@@ -249,15 +212,14 @@ where
                 })
                 .collect();
 
-            let base_cursor = if layer.layout.bounds().contains(cursor_position)
-            {
+            let base_cursor = if layout.bounds().contains(cursor_position) {
                 // TODO: Type-safe cursor availability
                 Point::new(-1.0, -1.0)
             } else {
                 cursor_position
             };
 
-            self.overlay = Some(layer);
+            self.overlay = Some(layout);
 
             (base_cursor, event_statuses)
         } else {
@@ -273,7 +235,7 @@ where
 
                 let event_status = self.root.widget.on_event(
                     event,
-                    Layout::new(&self.base.layout),
+                    Layout::new(&self.base),
                     base_cursor,
                     renderer,
                     clipboard,
@@ -281,19 +243,11 @@ where
                 );
 
                 shell.revalidate_layout(|| {
-                    let hash = {
-                        let hasher = &mut crate::Hasher::default();
-                        self.root.hash_layout(hasher);
-
-                        hasher.finish()
-                    };
-
-                    let layout = renderer.layout(
+                    self.base = renderer.layout(
                         &self.root,
                         &layout::Limits::new(Size::ZERO, self.bounds),
                     );
 
-                    self.base = Layer { layout, hash };
                     self.overlay = None;
                 });
 
@@ -391,24 +345,8 @@ where
 
         let viewport = Rectangle::with_size(self.bounds);
 
-        self.overlay = if let Some(mut overlay) =
-            self.root.overlay(Layout::new(&self.base.layout), renderer)
-        {
-            let layer = Self::overlay_layer(
-                self.overlay.take(),
-                self.bounds,
-                &mut overlay,
-                renderer,
-            );
-
-            Some(layer)
-        } else {
-            None
-        };
-
-        if let Some(layer) = &self.overlay {
-            let base_cursor = if layer.layout.bounds().contains(cursor_position)
-            {
+        if let Some(layout) = &self.overlay {
+            let base_cursor = if layout.bounds().contains(cursor_position) {
                 Point::new(-1.0, -1.0)
             } else {
                 cursor_position
@@ -417,7 +355,7 @@ where
             self.root.widget.draw(
                 renderer,
                 &renderer::Style::default(),
-                Layout::new(&self.base.layout),
+                Layout::new(&self.base),
                 base_cursor,
                 &viewport,
             );
@@ -425,14 +363,14 @@ where
             self.root.widget.draw(
                 renderer,
                 &renderer::Style::default(),
-                Layout::new(&self.base.layout),
+                Layout::new(&self.base),
                 cursor_position,
                 &viewport,
             );
         };
 
         let base_interaction = self.root.widget.mouse_interaction(
-            Layout::new(&self.base.layout),
+            Layout::new(&self.base),
             cursor_position,
             &viewport,
             renderer,
@@ -452,34 +390,32 @@ where
         // avoid this additional call.
         overlay
             .as_ref()
-            .and_then(|layer| {
-                root.overlay(Layout::new(&base.layout), renderer).map(
-                    |overlay| {
-                        let overlay_interaction = overlay.mouse_interaction(
-                            Layout::new(&layer.layout),
-                            cursor_position,
-                            &viewport,
+            .and_then(|layout| {
+                root.overlay(Layout::new(&base), renderer).map(|overlay| {
+                    let overlay_interaction = overlay.mouse_interaction(
+                        Layout::new(layout),
+                        cursor_position,
+                        &viewport,
+                        renderer,
+                    );
+
+                    let overlay_bounds = layout.bounds();
+
+                    renderer.with_layer(overlay_bounds, |renderer| {
+                        overlay.draw(
                             renderer,
+                            &renderer::Style::default(),
+                            Layout::new(layout),
+                            cursor_position,
                         );
+                    });
 
-                        let overlay_bounds = layer.layout.bounds();
-
-                        renderer.with_layer(overlay_bounds, |renderer| {
-                            overlay.draw(
-                                renderer,
-                                &renderer::Style::default(),
-                                Layout::new(&layer.layout),
-                                cursor_position,
-                            );
-                        });
-
-                        if overlay_bounds.contains(cursor_position) {
-                            overlay_interaction
-                        } else {
-                            base_interaction
-                        }
-                    },
-                )
+                    if overlay_bounds.contains(cursor_position) {
+                        overlay_interaction
+                    } else {
+                        base_interaction
+                    }
+                })
             })
             .unwrap_or(base_interaction)
     }
@@ -487,66 +423,19 @@ where
     /// Relayouts and returns a new  [`UserInterface`] using the provided
     /// bounds.
     pub fn relayout(self, bounds: Size, renderer: &mut Renderer) -> Self {
-        Self::build(
-            self.root,
-            bounds,
-            Cache {
-                base: self.base,
-                overlay: self.overlay,
-                bounds: self.bounds,
-            },
-            renderer,
-        )
+        Self::build(self.root, bounds, Cache, renderer)
     }
 
     /// Extract the [`Cache`] of the [`UserInterface`], consuming it in the
     /// process.
     pub fn into_cache(self) -> Cache {
-        Cache {
-            base: self.base,
-            overlay: self.overlay,
-            bounds: self.bounds,
-        }
-    }
-
-    fn overlay_layer(
-        cache: Option<Layer>,
-        bounds: Size,
-        overlay: &mut overlay::Element<'_, Message, Renderer>,
-        renderer: &Renderer,
-    ) -> Layer {
-        let new_hash = {
-            let hasher = &mut crate::Hasher::default();
-            overlay.hash_layout(hasher);
-
-            hasher.finish()
-        };
-
-        let layout = match cache {
-            Some(Layer { hash, layout }) if new_hash == hash => layout,
-            _ => overlay.layout(renderer, bounds),
-        };
-
-        Layer {
-            layout,
-            hash: new_hash,
-        }
+        Cache
     }
 }
 
-#[derive(Debug, Clone)]
-struct Layer {
-    layout: layout::Node,
-    hash: u64,
-}
-
 /// Reusable data of a specific [`UserInterface`].
 #[derive(Debug, Clone)]
-pub struct Cache {
-    base: Layer,
-    overlay: Option<Layer>,
-    bounds: Size,
-}
+pub struct Cache;
 
 impl Cache {
     /// Creates an empty [`Cache`].
@@ -554,14 +443,7 @@ impl Cache {
     /// You should use this to initialize a [`Cache`] before building your first
     /// [`UserInterface`].
     pub fn new() -> Cache {
-        Cache {
-            base: Layer {
-                layout: layout::Node::new(Size::new(0.0, 0.0)),
-                hash: 0,
-            },
-            overlay: None,
-            bounds: Size::ZERO,
-        }
+        Cache
     }
 }
 
diff --git a/native/src/widget.rs b/native/src/widget.rs
index acd2e580..aacdc3d9 100644
--- a/native/src/widget.rs
+++ b/native/src/widget.rs
@@ -75,7 +75,7 @@ use crate::layout;
 use crate::mouse;
 use crate::overlay;
 use crate::renderer;
-use crate::{Clipboard, Hasher, Layout, Length, Point, Rectangle, Shell};
+use crate::{Clipboard, Layout, Length, Point, Rectangle, Shell};
 
 /// A component that displays information and allows interaction.
 ///
@@ -131,19 +131,6 @@ where
         viewport: &Rectangle,
     );
 
-    /// Computes the _layout_ hash of the [`Widget`].
-    ///
-    /// The produced hash is used by the runtime to decide if the [`Layout`]
-    /// needs to be recomputed between frames. Therefore, to ensure maximum
-    /// efficiency, the hash should only be affected by the properties of the
-    /// [`Widget`] that can affect layouting.
-    ///
-    /// For example, the [`Text`] widget does not hash its color property, as
-    /// its value cannot affect the overall [`Layout`] of the user interface.
-    ///
-    /// [`Text`]: crate::widget::Text
-    fn hash_layout(&self, state: &mut Hasher);
-
     /// Processes a runtime [`Event`].
     ///
     /// It receives:
diff --git a/native/src/widget/button.rs b/native/src/widget/button.rs
index b4a3adc3..57fdd7d4 100644
--- a/native/src/widget/button.rs
+++ b/native/src/widget/button.rs
@@ -8,12 +8,10 @@ use crate::overlay;
 use crate::renderer;
 use crate::touch;
 use crate::{
-    Background, Clipboard, Color, Element, Hasher, Layout, Length, Padding,
-    Point, Rectangle, Shell, Vector, Widget,
+    Background, Clipboard, Color, Element, Layout, Length, Padding, Point,
+    Rectangle, Shell, Vector, Widget,
 };
 
-use std::hash::Hash;
-
 pub use iced_style::button::{Style, StyleSheet};
 
 /// A generic widget that produces a message when pressed.
@@ -333,14 +331,6 @@ where
         );
     }
 
-    fn hash_layout(&self, state: &mut Hasher) {
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.width.hash(state);
-        self.content.hash_layout(state);
-    }
-
     fn overlay(
         &mut self,
         layout: Layout<'_>,
diff --git a/native/src/widget/checkbox.rs b/native/src/widget/checkbox.rs
index fff65a40..15cbf93a 100644
--- a/native/src/widget/checkbox.rs
+++ b/native/src/widget/checkbox.rs
@@ -1,6 +1,4 @@
 //! Show toggle controls using checkboxes.
-use std::hash::Hash;
-
 use crate::alignment;
 use crate::event::{self, Event};
 use crate::layout;
@@ -10,8 +8,8 @@ use crate::text;
 use crate::touch;
 use crate::widget::{self, Row, Text};
 use crate::{
-    Alignment, Clipboard, Element, Hasher, Layout, Length, Point, Rectangle,
-    Shell, Widget,
+    Alignment, Clipboard, Element, Layout, Length, Point, Rectangle, Shell,
+    Widget,
 };
 
 pub use iced_style::checkbox::{Style, StyleSheet};
@@ -262,13 +260,6 @@ where
             );
         }
     }
-
-    fn hash_layout(&self, state: &mut Hasher) {
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.label.hash(state);
-    }
 }
 
 impl<'a, Message, Renderer> From<Checkbox<'a, Message, Renderer>>
diff --git a/native/src/widget/column.rs b/native/src/widget/column.rs
index 66ed5e23..f161d1f2 100644
--- a/native/src/widget/column.rs
+++ b/native/src/widget/column.rs
@@ -1,14 +1,12 @@
 //! Distribute content vertically.
-use std::hash::Hash;
-
 use crate::event::{self, Event};
 use crate::layout;
 use crate::mouse;
 use crate::overlay;
 use crate::renderer;
 use crate::{
-    Alignment, Clipboard, Element, Hasher, Layout, Length, Padding, Point,
-    Rectangle, Shell, Widget,
+    Alignment, Clipboard, Element, Layout, Length, Padding, Point, Rectangle,
+    Shell, Widget,
 };
 
 use std::u32;
@@ -199,23 +197,6 @@ where
         }
     }
 
-    fn hash_layout(&self, state: &mut Hasher) {
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.width.hash(state);
-        self.height.hash(state);
-        self.max_width.hash(state);
-        self.max_height.hash(state);
-        self.align_items.hash(state);
-        self.spacing.hash(state);
-        self.padding.hash(state);
-
-        for child in &self.children {
-            child.widget.hash_layout(state);
-        }
-    }
-
     fn overlay(
         &mut self,
         layout: Layout<'_>,
diff --git a/native/src/widget/container.rs b/native/src/widget/container.rs
index 4444732a..ca85a425 100644
--- a/native/src/widget/container.rs
+++ b/native/src/widget/container.rs
@@ -1,6 +1,4 @@
 //! Decorate content and apply alignment.
-use std::hash::Hash;
-
 use crate::alignment::{self, Alignment};
 use crate::event::{self, Event};
 use crate::layout;
@@ -8,8 +6,8 @@ use crate::mouse;
 use crate::overlay;
 use crate::renderer;
 use crate::{
-    Background, Clipboard, Color, Element, Hasher, Layout, Length, Padding,
-    Point, Rectangle, Shell, Widget,
+    Background, Clipboard, Color, Element, Layout, Length, Padding, Point,
+    Rectangle, Shell, Widget,
 };
 
 use std::u32;
@@ -219,21 +217,6 @@ where
         );
     }
 
-    fn hash_layout(&self, state: &mut Hasher) {
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.padding.hash(state);
-        self.width.hash(state);
-        self.height.hash(state);
-        self.max_width.hash(state);
-        self.max_height.hash(state);
-        self.horizontal_alignment.hash(state);
-        self.vertical_alignment.hash(state);
-
-        self.content.hash_layout(state);
-    }
-
     fn overlay(
         &mut self,
         layout: Layout<'_>,
diff --git a/native/src/widget/image.rs b/native/src/widget/image.rs
index 83c24ee5..de0ffbc0 100644
--- a/native/src/widget/image.rs
+++ b/native/src/widget/image.rs
@@ -6,8 +6,7 @@ use crate::image;
 use crate::layout;
 use crate::renderer;
 use crate::{
-    ContentFit, Element, Hasher, Layout, Length, Point, Rectangle, Size,
-    Vector, Widget,
+    ContentFit, Element, Layout, Length, Point, Rectangle, Size, Vector, Widget,
 };
 
 use std::hash::Hash;
@@ -149,16 +148,6 @@ where
             render(renderer)
         }
     }
-
-    fn hash_layout(&self, state: &mut Hasher) {
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.handle.hash(state);
-        self.width.hash(state);
-        self.height.hash(state);
-        self.content_fit.hash(state);
-    }
 }
 
 impl<'a, Message, Renderer, Handle> From<Image<Handle>>
diff --git a/native/src/widget/image/viewer.rs b/native/src/widget/image/viewer.rs
index 486d5fa5..840b88e5 100644
--- a/native/src/widget/image/viewer.rs
+++ b/native/src/widget/image/viewer.rs
@@ -5,8 +5,8 @@ use crate::layout;
 use crate::mouse;
 use crate::renderer;
 use crate::{
-    Clipboard, Element, Hasher, Layout, Length, Point, Rectangle, Shell, Size,
-    Vector, Widget,
+    Clipboard, Element, Layout, Length, Point, Rectangle, Shell, Size, Vector,
+    Widget,
 };
 
 use std::hash::Hash;
@@ -335,17 +335,6 @@ where
             });
         });
     }
-
-    fn hash_layout(&self, state: &mut Hasher) {
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.width.hash(state);
-        self.height.hash(state);
-        self.padding.hash(state);
-
-        self.handle.hash(state);
-    }
 }
 
 /// The local state of a [`Viewer`].
diff --git a/native/src/widget/pane_grid.rs b/native/src/widget/pane_grid.rs
index 5f293fa6..8ad63cf1 100644
--- a/native/src/widget/pane_grid.rs
+++ b/native/src/widget/pane_grid.rs
@@ -34,8 +34,8 @@ use crate::overlay;
 use crate::renderer;
 use crate::touch;
 use crate::{
-    Clipboard, Color, Element, Hasher, Layout, Length, Point, Rectangle, Shell,
-    Size, Vector, Widget,
+    Clipboard, Color, Element, Layout, Length, Point, Rectangle, Shell, Size,
+    Vector, Widget,
 };
 
 pub use iced_style::pane_grid::{Line, StyleSheet};
@@ -666,21 +666,6 @@ where
         }
     }
 
-    fn hash_layout(&self, state: &mut Hasher) {
-        use std::hash::Hash;
-
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.width.hash(state);
-        self.height.hash(state);
-        self.state.hash_layout(state);
-
-        for (_, element) in &self.elements {
-            element.hash_layout(state);
-        }
-    }
-
     fn overlay(
         &mut self,
         layout: Layout<'_>,
diff --git a/native/src/widget/pane_grid/content.rs b/native/src/widget/pane_grid/content.rs
index 6d12aa2d..8b0e8d2a 100644
--- a/native/src/widget/pane_grid/content.rs
+++ b/native/src/widget/pane_grid/content.rs
@@ -5,9 +5,7 @@ use crate::overlay;
 use crate::renderer;
 use crate::widget::container;
 use crate::widget::pane_grid::TitleBar;
-use crate::{
-    Clipboard, Element, Hasher, Layout, Point, Rectangle, Shell, Size,
-};
+use crate::{Clipboard, Element, Layout, Point, Rectangle, Shell, Size};
 
 /// The content of a [`Pane`].
 ///
@@ -236,14 +234,6 @@ where
             .max(title_bar_interaction)
     }
 
-    pub(crate) fn hash_layout(&self, state: &mut Hasher) {
-        if let Some(title_bar) = &self.title_bar {
-            title_bar.hash_layout(state);
-        }
-
-        self.body.hash_layout(state);
-    }
-
     pub(crate) fn overlay(
         &mut self,
         layout: Layout<'_>,
diff --git a/native/src/widget/pane_grid/state.rs b/native/src/widget/pane_grid/state.rs
index bcc724a8..feea0dec 100644
--- a/native/src/widget/pane_grid/state.rs
+++ b/native/src/widget/pane_grid/state.rs
@@ -1,7 +1,7 @@
 use crate::widget::pane_grid::{
     Axis, Configuration, Direction, Node, Pane, Split,
 };
-use crate::{Hasher, Point, Rectangle, Size};
+use crate::{Point, Rectangle, Size};
 
 use std::collections::{BTreeMap, HashMap};
 
@@ -292,10 +292,4 @@ impl Internal {
     pub fn idle(&mut self) {
         self.action = Action::Idle;
     }
-
-    pub fn hash_layout(&self, hasher: &mut Hasher) {
-        use std::hash::Hash;
-
-        self.layout.hash(hasher);
-    }
 }
diff --git a/native/src/widget/pane_grid/title_bar.rs b/native/src/widget/pane_grid/title_bar.rs
index ea9ebfc4..d56972ec 100644
--- a/native/src/widget/pane_grid/title_bar.rs
+++ b/native/src/widget/pane_grid/title_bar.rs
@@ -5,7 +5,7 @@ use crate::overlay;
 use crate::renderer;
 use crate::widget::container;
 use crate::{
-    Clipboard, Element, Hasher, Layout, Padding, Point, Rectangle, Shell, Size,
+    Clipboard, Element, Layout, Padding, Point, Rectangle, Shell, Size,
 };
 
 /// The title bar of a [`Pane`].
@@ -157,17 +157,6 @@ where
         }
     }
 
-    pub(crate) fn hash_layout(&self, hasher: &mut Hasher) {
-        use std::hash::Hash;
-
-        self.content.hash_layout(hasher);
-        self.padding.hash(hasher);
-
-        if let Some(controls) = &self.controls {
-            controls.hash_layout(hasher);
-        }
-    }
-
     pub(crate) fn layout(
         &self,
         renderer: &Renderer,
diff --git a/native/src/widget/pick_list.rs b/native/src/widget/pick_list.rs
index a200fb13..3be6c20c 100644
--- a/native/src/widget/pick_list.rs
+++ b/native/src/widget/pick_list.rs
@@ -10,8 +10,8 @@ use crate::renderer;
 use crate::text::{self, Text};
 use crate::touch;
 use crate::{
-    Clipboard, Element, Hasher, Layout, Length, Padding, Point, Rectangle,
-    Shell, Size, Widget,
+    Clipboard, Element, Layout, Length, Padding, Point, Rectangle, Shell, Size,
+    Widget,
 };
 use std::borrow::Cow;
 
@@ -220,24 +220,6 @@ where
         layout::Node::new(size)
     }
 
-    fn hash_layout(&self, state: &mut Hasher) {
-        use std::hash::Hash as _;
-
-        match self.width {
-            Length::Shrink => {
-                self.placeholder.hash(state);
-
-                self.options
-                    .iter()
-                    .map(ToString::to_string)
-                    .for_each(|label| label.hash(state));
-            }
-            _ => {
-                self.width.hash(state);
-            }
-        }
-    }
-
     fn on_event(
         &mut self,
         event: Event,
diff --git a/native/src/widget/progress_bar.rs b/native/src/widget/progress_bar.rs
index 69eb8c09..c26c38fa 100644
--- a/native/src/widget/progress_bar.rs
+++ b/native/src/widget/progress_bar.rs
@@ -1,11 +1,9 @@
 //! Provide progress feedback to your users.
 use crate::layout;
 use crate::renderer;
-use crate::{
-    Color, Element, Hasher, Layout, Length, Point, Rectangle, Size, Widget,
-};
+use crate::{Color, Element, Layout, Length, Point, Rectangle, Size, Widget};
 
-use std::{hash::Hash, ops::RangeInclusive};
+use std::ops::RangeInclusive;
 
 pub use iced_style::progress_bar::{Style, StyleSheet};
 
@@ -141,14 +139,6 @@ where
             );
         }
     }
-
-    fn hash_layout(&self, state: &mut Hasher) {
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.width.hash(state);
-        self.height.hash(state);
-    }
 }
 
 impl<'a, Message, Renderer> From<ProgressBar<'a>>
diff --git a/native/src/widget/radio.rs b/native/src/widget/radio.rs
index c4992764..fed2925b 100644
--- a/native/src/widget/radio.rs
+++ b/native/src/widget/radio.rs
@@ -1,6 +1,4 @@
 //! Create choices using radio buttons.
-use std::hash::Hash;
-
 use crate::alignment;
 use crate::event::{self, Event};
 use crate::layout;
@@ -10,8 +8,8 @@ use crate::text;
 use crate::touch;
 use crate::widget::{self, Row, Text};
 use crate::{
-    Alignment, Clipboard, Color, Element, Hasher, Layout, Length, Point,
-    Rectangle, Shell, Widget,
+    Alignment, Clipboard, Color, Element, Layout, Length, Point, Rectangle,
+    Shell, Widget,
 };
 
 pub use iced_style::radio::{Style, StyleSheet};
@@ -280,13 +278,6 @@ where
             );
         }
     }
-
-    fn hash_layout(&self, state: &mut Hasher) {
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.label.hash(state);
-    }
 }
 
 impl<'a, Message, Renderer> From<Radio<'a, Message, Renderer>>
diff --git a/native/src/widget/row.rs b/native/src/widget/row.rs
index c423d31f..e34befb2 100644
--- a/native/src/widget/row.rs
+++ b/native/src/widget/row.rs
@@ -5,11 +5,10 @@ use crate::mouse;
 use crate::overlay;
 use crate::renderer;
 use crate::{
-    Alignment, Clipboard, Element, Hasher, Layout, Length, Padding, Point,
-    Rectangle, Shell, Widget,
+    Alignment, Clipboard, Element, Layout, Length, Padding, Point, Rectangle,
+    Shell, Widget,
 };
 
-use std::hash::Hash;
 use std::u32;
 
 /// A container that distributes its contents horizontally.
@@ -198,23 +197,6 @@ where
         }
     }
 
-    fn hash_layout(&self, state: &mut Hasher) {
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.width.hash(state);
-        self.height.hash(state);
-        self.max_width.hash(state);
-        self.max_height.hash(state);
-        self.align_items.hash(state);
-        self.spacing.hash(state);
-        self.padding.hash(state);
-
-        for child in &self.children {
-            child.widget.hash_layout(state);
-        }
-    }
-
     fn overlay(
         &mut self,
         layout: Layout<'_>,
diff --git a/native/src/widget/rule.rs b/native/src/widget/rule.rs
index 7c8c5dbc..b0cc3768 100644
--- a/native/src/widget/rule.rs
+++ b/native/src/widget/rule.rs
@@ -1,11 +1,7 @@
 //! Display a horizontal or vertical rule for dividing content.
 use crate::layout;
 use crate::renderer;
-use crate::{
-    Color, Element, Hasher, Layout, Length, Point, Rectangle, Size, Widget,
-};
-
-use std::hash::Hash;
+use crate::{Color, Element, Layout, Length, Point, Rectangle, Size, Widget};
 
 pub use iced_style::rule::{FillMode, Style, StyleSheet};
 
@@ -122,14 +118,6 @@ where
             style.color,
         );
     }
-
-    fn hash_layout(&self, state: &mut Hasher) {
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.width.hash(state);
-        self.height.hash(state);
-    }
 }
 
 impl<'a, Message, Renderer> From<Rule<'a>> for Element<'a, Message, Renderer>
diff --git a/native/src/widget/scrollable.rs b/native/src/widget/scrollable.rs
index 4b005c6b..ce734ad8 100644
--- a/native/src/widget/scrollable.rs
+++ b/native/src/widget/scrollable.rs
@@ -7,11 +7,11 @@ use crate::renderer;
 use crate::touch;
 use crate::widget::Column;
 use crate::{
-    Alignment, Background, Clipboard, Color, Element, Hasher, Layout, Length,
-    Padding, Point, Rectangle, Shell, Size, Vector, Widget,
+    Alignment, Background, Clipboard, Color, Element, Layout, Length, Padding,
+    Point, Rectangle, Shell, Size, Vector, Widget,
 };
 
-use std::{f32, hash::Hash, u32};
+use std::{f32, u32};
 
 pub use iced_style::scrollable::StyleSheet;
 
@@ -570,16 +570,6 @@ where
         }
     }
 
-    fn hash_layout(&self, state: &mut Hasher) {
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.height.hash(state);
-        self.max_height.hash(state);
-
-        self.content.hash_layout(state)
-    }
-
     fn overlay(
         &mut self,
         layout: Layout<'_>,
diff --git a/native/src/widget/slider.rs b/native/src/widget/slider.rs
index 917bfc14..289f75f5 100644
--- a/native/src/widget/slider.rs
+++ b/native/src/widget/slider.rs
@@ -7,11 +7,10 @@ use crate::mouse;
 use crate::renderer;
 use crate::touch;
 use crate::{
-    Background, Clipboard, Color, Element, Hasher, Layout, Length, Point,
-    Rectangle, Shell, Size, Widget,
+    Background, Clipboard, Color, Element, Layout, Length, Point, Rectangle,
+    Shell, Size, Widget,
 };
 
-use std::hash::Hash;
 use std::ops::RangeInclusive;
 
 pub use iced_style::slider::{Handle, HandleShape, Style, StyleSheet};
@@ -374,13 +373,6 @@ where
             mouse::Interaction::default()
         }
     }
-
-    fn hash_layout(&self, state: &mut Hasher) {
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.width.hash(state);
-    }
 }
 
 impl<'a, T, Message, Renderer> From<Slider<'a, T, Message>>
diff --git a/native/src/widget/space.rs b/native/src/widget/space.rs
index 3373f3b7..4135d1b8 100644
--- a/native/src/widget/space.rs
+++ b/native/src/widget/space.rs
@@ -1,9 +1,7 @@
 //! Distribute content vertically.
 use crate::layout;
 use crate::renderer;
-use crate::{Element, Hasher, Layout, Length, Point, Rectangle, Size, Widget};
-
-use std::hash::Hash;
+use crate::{Element, Layout, Length, Point, Rectangle, Size, Widget};
 
 /// An amount of empty space.
 ///
@@ -68,13 +66,6 @@ where
         _viewport: &Rectangle,
     ) {
     }
-
-    fn hash_layout(&self, state: &mut Hasher) {
-        std::any::TypeId::of::<Space>().hash(state);
-
-        self.width.hash(state);
-        self.height.hash(state);
-    }
 }
 
 impl<'a, Message, Renderer> From<Space> for Element<'a, Message, Renderer>
diff --git a/native/src/widget/svg.rs b/native/src/widget/svg.rs
index 22aac331..008ab356 100644
--- a/native/src/widget/svg.rs
+++ b/native/src/widget/svg.rs
@@ -3,11 +3,9 @@ use crate::layout;
 use crate::renderer;
 use crate::svg::{self, Handle};
 use crate::{
-    ContentFit, Element, Hasher, Layout, Length, Point, Rectangle, Size,
-    Vector, Widget,
+    ContentFit, Element, Layout, Length, Point, Rectangle, Size, Vector, Widget,
 };
 
-use std::hash::Hash;
 use std::path::PathBuf;
 
 /// A vector graphics image.
@@ -146,15 +144,6 @@ where
             render(renderer)
         }
     }
-
-    fn hash_layout(&self, state: &mut Hasher) {
-        std::any::TypeId::of::<Svg>().hash(state);
-
-        self.handle.hash(state);
-        self.width.hash(state);
-        self.height.hash(state);
-        self.content_fit.hash(state);
-    }
 }
 
 impl<'a, Message, Renderer> From<Svg> for Element<'a, Message, Renderer>
diff --git a/native/src/widget/text.rs b/native/src/widget/text.rs
index f0b29d15..6f00c9c8 100644
--- a/native/src/widget/text.rs
+++ b/native/src/widget/text.rs
@@ -3,11 +3,7 @@ use crate::alignment;
 use crate::layout;
 use crate::renderer;
 use crate::text;
-use crate::{
-    Color, Element, Hasher, Layout, Length, Point, Rectangle, Size, Widget,
-};
-
-use std::hash::Hash;
+use crate::{Color, Element, Layout, Length, Point, Rectangle, Size, Widget};
 
 /// A paragraph of text.
 ///
@@ -151,16 +147,6 @@ where
             self.vertical_alignment,
         );
     }
-
-    fn hash_layout(&self, state: &mut Hasher) {
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.content.hash(state);
-        self.size.hash(state);
-        self.width.hash(state);
-        self.height.hash(state);
-    }
 }
 
 /// Draws text using the same logic as the [`Text`] widget.
diff --git a/native/src/widget/text_input.rs b/native/src/widget/text_input.rs
index 03adeb12..e30e2343 100644
--- a/native/src/widget/text_input.rs
+++ b/native/src/widget/text_input.rs
@@ -20,8 +20,8 @@ use crate::renderer;
 use crate::text::{self, Text};
 use crate::touch;
 use crate::{
-    Clipboard, Color, Element, Hasher, Layout, Length, Padding, Point,
-    Rectangle, Shell, Size, Vector, Widget,
+    Clipboard, Color, Element, Layout, Length, Padding, Point, Rectangle,
+    Shell, Size, Vector, Widget,
 };
 
 use std::u32;
@@ -783,17 +783,6 @@ where
     ) {
         self.draw(renderer, layout, cursor_position, None)
     }
-
-    fn hash_layout(&self, state: &mut Hasher) {
-        use std::{any::TypeId, hash::Hash};
-        struct Marker;
-        TypeId::of::<Marker>().hash(state);
-
-        self.width.hash(state);
-        self.max_width.hash(state);
-        self.padding.hash(state);
-        self.size.hash(state);
-    }
 }
 
 impl<'a, Message, Renderer> From<TextInput<'a, Message, Renderer>>
diff --git a/native/src/widget/toggler.rs b/native/src/widget/toggler.rs
index 002e0a4f..48237edb 100644
--- a/native/src/widget/toggler.rs
+++ b/native/src/widget/toggler.rs
@@ -1,5 +1,4 @@
 //! Show toggle controls using togglers.
-use std::hash::Hash;
 
 use crate::alignment;
 use crate::event;
@@ -9,8 +8,8 @@ use crate::renderer;
 use crate::text;
 use crate::widget::{Row, Text};
 use crate::{
-    Alignment, Clipboard, Element, Event, Hasher, Layout, Length, Point,
-    Rectangle, Shell, Widget,
+    Alignment, Clipboard, Element, Event, Layout, Length, Point, Rectangle,
+    Shell, Widget,
 };
 
 pub use iced_style::toggler::{Style, StyleSheet};
@@ -295,13 +294,6 @@ where
             style.foreground,
         );
     }
-
-    fn hash_layout(&self, state: &mut Hasher) {
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.label.hash(state)
-    }
 }
 
 impl<'a, Message, Renderer> From<Toggler<'a, Message, Renderer>>
diff --git a/native/src/widget/tooltip.rs b/native/src/widget/tooltip.rs
index f6630864..7989c768 100644
--- a/native/src/widget/tooltip.rs
+++ b/native/src/widget/tooltip.rs
@@ -1,8 +1,4 @@
 //! Display a widget over another.
-use std::hash::Hash;
-
-use iced_core::Rectangle;
-
 use crate::event;
 use crate::layout;
 use crate::mouse;
@@ -11,8 +7,8 @@ use crate::text;
 use crate::widget::container;
 use crate::widget::text::Text;
 use crate::{
-    Clipboard, Element, Event, Hasher, Layout, Length, Padding, Point, Shell,
-    Size, Vector, Widget,
+    Clipboard, Element, Event, Layout, Length, Padding, Point, Rectangle,
+    Shell, Size, Vector, Widget,
 };
 
 /// An element to display a widget over another.
@@ -268,13 +264,6 @@ where
             });
         }
     }
-
-    fn hash_layout(&self, state: &mut Hasher) {
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.content.hash_layout(state);
-    }
 }
 
 impl<'a, Message, Renderer> From<Tooltip<'a, Message, Renderer>>