Remove trait-specific draw logic in iced_native

wgpu/src/backend.rs

@@ -8,7 +8,6 @@ use iced_graphics::font;
 use iced_graphics::layer::Layer;
 use iced_graphics::{Primitive, Viewport};
 use iced_native::alignment;
-use iced_native::mouse;
 use iced_native::{Font, Size};
 
 #[cfg(any(feature = "image_rs", feature = "svg"))]
@@ -28,6 +27,7 @@ pub struct Backend {
     image_pipeline: image::Pipeline,
 
     default_text_size: u16,
+    primitive: Primitive,
 }
 
 impl Backend {
@@ -60,6 +60,7 @@ impl Backend {
             image_pipeline,
 
             default_text_size: settings.default_text_size,
+            primitive: Primitive::None,
         }
     }
 
@@ -67,16 +68,16 @@ impl Backend {
     ///
     /// The text provided as overlay will be rendered on top of the primitives.
     /// This is useful for rendering debug information.
-    pub fn draw<T: AsRef<str>>(
+    pub fn present<T: AsRef<str>>(
         &mut self,
         device: &wgpu::Device,
         staging_belt: &mut wgpu::util::StagingBelt,
         encoder: &mut wgpu::CommandEncoder,
         frame: &wgpu::TextureView,
+        primitive: &Primitive,
         viewport: &Viewport,
-        (primitive, mouse_interaction): &(Primitive, mouse::Interaction),
         overlay_text: &[T],
-    ) -> mouse::Interaction {
+    ) {
         log::debug!("Drawing");
 
         let target_size = viewport.physical_size();
@@ -102,8 +103,6 @@ impl Backend {
 
         #[cfg(any(feature = "image_rs", feature = "svg"))]
         self.image_pipeline.trim_cache();
-
-        *mouse_interaction
     }
 
     fn flush(