Make Hasher opaque

Cargo.toml

@@ -14,7 +14,7 @@ categories = ["gui"]
 [dependencies]
 stretch = "0.2"
 nalgebra = "0.18"
-twox-hash = "1.3"
+twox-hash = "1.5"
 
 [dev-dependencies]
 ggez = { version = "0.5", git = "https://github.com/hecrj/ggez" }

src/element.rs

@@ -87,8 +87,8 @@ impl<'a, Message, Renderer> Element<'a, Message, Renderer> {
         node.0.compute_layout(geometry::Size::undefined()).unwrap()
     }
 
-    pub(crate) fn hash(&self, state: &mut Hasher) {
-        self.widget.hash(state);
+    pub(crate) fn hash_layout(&self, state: &mut Hasher) {
+        self.widget.hash_layout(state);
     }
 }
 
@@ -157,8 +157,8 @@ where
         self.widget.draw(renderer, layout, cursor_position)
     }
 
-    fn hash(&self, state: &mut Hasher) {
-        self.widget.hash(state);
+    fn hash_layout(&self, state: &mut Hasher) {
+        self.widget.hash_layout(state);
     }
 }
 
@@ -222,7 +222,7 @@ where
         self.element.widget.draw(renderer, layout, cursor_position)
     }
 
-    fn hash(&self, state: &mut Hasher) {
-        self.element.widget.hash(state);
+    fn hash_layout(&self, state: &mut Hasher) {
+        self.element.widget.hash_layout(state);
     }
 }

src/hasher.rs

@@ -1,2 +1,18 @@
 /// The hasher used to compare layouts.
-pub type Hasher = twox_hash::XxHash;
+pub struct Hasher(twox_hash::XxHash64);
+
+impl Default for Hasher {
+    fn default() -> Self {
+        Hasher(twox_hash::XxHash64::default())
+    }
+}
+
+impl core::hash::Hasher for Hasher {
+    fn write(&mut self, bytes: &[u8]) {
+        self.0.write(bytes)
+    }
+
+    fn finish(&self) -> u64 {
+        self.0.finish()
+    }
+}

src/user_interface.rs

@@ -86,7 +86,7 @@ impl<'a, Message, Renderer> UserInterface<'a, Message, Renderer> {
         let root = root.into();
 
         let hasher = &mut crate::Hasher::default();
-        root.hash(hasher);
+        root.hash_layout(hasher);
 
         let hash = hasher.finish();
 
@@ -302,7 +302,7 @@ impl Cache {
         let root: Element<'_, (), ()> = Column::new().into();
 
         let hasher = &mut crate::Hasher::default();
-        root.hash(hasher);
+        root.hash_layout(hasher);
 
         Cache {
             hash: hasher.finish(),

src/widget.rs

@@ -83,7 +83,7 @@ pub trait Widget<Message, Renderer>: std::fmt::Debug {
     /// [`Widget`]: trait.Widget.html
     /// [`Layout`]: ../struct.Layout.html
     /// [`Text`]: text/struct.Text.html
-    fn hash(&self, state: &mut Hasher);
+    fn hash_layout(&self, state: &mut Hasher);
 
     /// Processes a runtime [`Event`].
     ///

src/widget/button.rs

@@ -187,7 +187,7 @@ where
         )
     }
 
-    fn hash(&self, state: &mut Hasher) {
+    fn hash_layout(&self, state: &mut Hasher) {
         self.style.hash(state);
     }
 }

src/widget/checkbox.rs

@@ -158,7 +158,7 @@ where
         )
     }
 
-    fn hash(&self, state: &mut Hasher) {
+    fn hash_layout(&self, state: &mut Hasher) {
         self.label.hash(state);
     }
 }

src/widget/column.rs

@@ -199,12 +199,12 @@ impl<'a, Message, Renderer> Widget<Message, Renderer>
         cursor
     }
 
-    fn hash(&self, state: &mut Hasher) {
+    fn hash_layout(&self, state: &mut Hasher) {
         self.style.hash(state);
         self.spacing.hash(state);
 
         for child in &self.children {
-            child.widget.hash(state);
+            child.widget.hash_layout(state);
         }
     }
 }

src/widget/radio.rs

@@ -168,7 +168,7 @@ where
         )
     }
 
-    fn hash(&self, state: &mut Hasher) {
+    fn hash_layout(&self, state: &mut Hasher) {
         self.label.hash(state);
     }
 }

src/widget/row.rs

@@ -196,12 +196,12 @@ impl<'a, Message, Renderer> Widget<Message, Renderer>
         cursor
     }
 
-    fn hash(&self, state: &mut Hasher) {
+    fn hash_layout(&self, state: &mut Hasher) {
         self.style.hash(state);
         self.spacing.hash(state);
 
         for child in &self.children {
-            child.widget.hash(state);
+            child.widget.hash_layout(state);
         }
     }
 }

src/widget/slider.rs

@@ -169,7 +169,7 @@ where
         )
     }
 
-    fn hash(&self, state: &mut Hasher) {
+    fn hash_layout(&self, state: &mut Hasher) {
         self.style.hash(state);
     }
 }

src/widget/text.rs

@@ -134,7 +134,7 @@ where
         MouseCursor::OutOfBounds
     }
 
-    fn hash(&self, state: &mut Hasher) {
+    fn hash_layout(&self, state: &mut Hasher) {
         self.style.hash(state);
 
         self.content.hash(state);