Remove default styling of Button

- A background will only show if explicitly set.
- `iced_wgpu` won't apply a `min_width` of 100 units anymore.

core/src/widget/button.rs

@@ -19,6 +19,8 @@ pub struct Button<'a, Message, Element> {
 
     pub width: Length,
 
+    pub min_width: u32,
+
     pub padding: u16,
 
     pub background: Option<Background>,
@@ -52,6 +54,7 @@ impl<'a, Message, Element> Button<'a, Message, Element> {
             content: content.into(),
             on_press: None,
             width: Length::Shrink,
+            min_width: 0,
             padding: 0,
             background: None,
             border_radius: 0,
@@ -66,6 +69,11 @@ impl<'a, Message, Element> Button<'a, Message, Element> {
         self
     }
 
+    pub fn min_width(mut self, min_width: u32) -> Self {
+        self.min_width = min_width;
+        self
+    }
+
     pub fn padding(mut self, padding: u16) -> Self {
         self.padding = padding;
         self

examples/tour.rs

@@ -671,6 +671,7 @@ fn button<'a, Message>(
     )
     .padding(12)
     .border_radius(12)
+    .min_width(100)
 }
 
 fn primary_button<'a, Message>(

wgpu/src/renderer/widget/button.rs

@@ -12,7 +12,7 @@ impl button::Renderer for Renderer {
     ) -> layout::Node {
         let padding = f32::from(button.padding);
         let limits = limits
-            .min_width(100)
+            .min_width(button.min_width)
             .width(button.width)
             .height(Length::Shrink)
             .pad(padding);
@@ -56,7 +56,9 @@ impl button::Renderer for Renderer {
         };
 
         (
-            Primitive::Group {
+            match button.background {
+                None => content,
+                Some(background) => Primitive::Group {
                     primitives: vec![
                         Primitive::Quad {
                             bounds: Rectangle {
@@ -71,14 +73,13 @@ impl button::Renderer for Renderer {
                         },
                         Primitive::Quad {
                             bounds,
-                        background: button.background.unwrap_or(
+                            background,
-                            Background::Color([0.8, 0.8, 0.8].into()),
-                        ),
                             border_radius: button.border_radius,
                         },
                         content,
                     ],
                 },
+            },
             if is_mouse_over {
                 MouseCursor::Pointer
             } else {