add should_wrap flag

hui/src/element.rs

@@ -33,7 +33,7 @@ pub struct ProcessContext<'a> {
 
 pub trait UiElement {
   /// Get the name of the element, for example "Button" or "ProgressBar"
-  fn name(&self) -> &'static str { "UiElement" }
+  fn name(&self) -> &'static str;
 
   /// Get the unique id used for internal state management\
   /// This value must be unique for each instance of the element
@@ -41,11 +41,13 @@ pub trait UiElement {
   /// If the element is stateless, this function should return `None`
   fn state_id(&self) -> Option<u64> { None }
 
-  /// Check if the element has state
+  /// Check if the element has state.\
+  /// Should not be overridden
   fn is_stateful(&self) -> bool { self.state_id().is_some() }
 
-  /// Check if the element has no state
-  fn is_stateless(&self) -> bool { self.state_id().is_none() }
+  /// Check if the element has no state\
+  /// Should not be overridden
+  fn is_stateless(&self) -> bool { !self.is_stateful() }
 
   /// Initialize the state of the element\
   /// This function should be called exactly once during the lifetime of the element,

hui/src/element/builtin/container.rs

@@ -103,6 +103,10 @@ impl Container {
 }
 
 impl UiElement for Container {
+  fn name(&self) -> &'static str {
+    "Container"
+  }
+
   fn measure(&self, ctx: MeasureContext) -> Response {
     let mut size = Vec2::ZERO;
     let mut leftover_gap = Vec2::ZERO;
@@ -156,7 +160,7 @@ impl UiElement for Container {
         inner_content_size,
         ..Default::default()
       },
-      user_data: None
+      ..Default::default()
     }
   }
 

hui/src/element/builtin/fill_rect.rs

@@ -40,6 +40,10 @@ impl Default for FillRect {
 }
 
 impl UiElement for FillRect {
+  fn name(&self) -> &'static str {
+    "FillRect"
+  }
+
   fn measure(&self, ctx: MeasureContext) -> Response {
     Response {
       size: vec2(
@@ -54,8 +58,7 @@ impl UiElement for FillRect {
           Size::Static(pixels) => pixels,
         },
       ),
-      hints: Default::default(),
-      user_data: None
+      ..Default::default()
     }
   }
 

hui/src/element/builtin/progress_bar.rs

@@ -49,7 +49,9 @@ impl Default for ProgressBar {
 }
 
 impl UiElement for ProgressBar {
-  fn name(&self) -> &'static str { "Progress bar" }
+  fn name(&self) -> &'static str {
+    "ProgressBar"
+  }
 
   fn measure(&self, ctx: MeasureContext) -> Response {
     Response {
@@ -67,6 +69,7 @@ impl UiElement for ProgressBar {
       ),
       hints: Default::default(),
       user_data: None,
+      ..Default::default()
     }
   }
 

hui/src/element/builtin/spacer.rs

@@ -18,14 +18,17 @@ impl Default for Spacer {
 }
 
 impl UiElement for Spacer {
+  fn name(&self) -> &'static str {
+    "Spacer"
+  }
+
   fn measure(&self, ctx: MeasureContext) -> Response {
     Response {
       size: match ctx.layout.direction {
         UiDirection::Horizontal => vec2(self.0, 0.),
         UiDirection::Vertical => vec2(0., self.0),
       },
-      hints: Default::default(),
-      user_data: None
+      ..Default::default()
     }
   }
 

hui/src/element/builtin/text.rs

@@ -63,6 +63,10 @@ impl Text {
 }
 
 impl UiElement for Text {
+  fn name(&self) -> &'static str {
+    "Text"
+  }
+
   fn measure(&self, ctx: MeasureContext) -> Response {
     let mut size = (0., 0.);
     if matches!(self.size.width, Size::Auto) || matches!(self.size.height, Size::Auto) {
@@ -84,8 +88,7 @@ impl UiElement for Text {
           Size::Static(pixels) => pixels,
         },
       ),
-      hints: Default::default(),
-      user_data: None
+      ..Default::default()
     }
   }
 

hui/src/element/builtin/transformer.rs

@@ -37,6 +37,10 @@ impl Transformer {
 }
 
 impl UiElement for Transformer {
+  fn name(&self) -> &'static str {
+    "Transformer"
+  }
+
   fn measure(&self, ctx: MeasureContext) -> Response {
     self.element.measure(ctx)
   }

hui/src/measure.rs

@@ -11,7 +11,18 @@ pub struct Hints {
 
 #[derive(Default)]
 pub struct Response {
+  /// Computed size of the element
   pub size: Vec2,
+
+  /// Hints for the layout system, can be used to optimize the layout engine.\
+  /// These will never cause the UI to be rendered differently (assuming the values are correct)
   pub hints: Hints,
+
+  /// Arbitrary user data, can be used to pass data (for example, cache) between measure and process stages
   pub user_data: Option<Box<dyn std::any::Any>>,
+
+  /// If true, the element should always cause the content to wrap to the next line\
+  /// (the element itself gets wrapped to the next line too)
+  /// You should almost never set this
+  pub should_wrap: bool,
 }