Add Scrollable trait

examples/linear.rs

@@ -2,7 +2,7 @@ extern crate cursive;
 
 use cursive::align::HAlign;
 use cursive::traits::*;
-use cursive::views::{Dialog, DummyView, LinearLayout, ScrollView, TextView};
+use cursive::views::{Dialog, DummyView, LinearLayout, TextView};
 use cursive::Cursive;
 
 // This example uses a LinearLayout to stick multiple views next to each other.
@@ -25,9 +25,9 @@ fn main() {
                 // Disabling scrollable means the view cannot shrink.
                 .child(TextView::new(text))
                 // The other views will share the remaining space.
-                .child(ScrollView::new(TextView::new(text)))
-                .child(ScrollView::new(TextView::new(text)))
-                .child(ScrollView::new(TextView::new(text)))
+                .child(TextView::new(text).scrollable())
+                .child(TextView::new(text).scrollable())
+                .child(TextView::new(text).scrollable())
                 .fixed_width(30),
         ).button("Quit", |s| s.quit())
             .h_align(HAlign::Center),

examples/lorem.rs

@@ -1,7 +1,8 @@
 extern crate cursive;
 
 use cursive::align::HAlign;
-use cursive::views::{Dialog, Panel, ScrollView, TextView};
+use cursive::view::Scrollable;
+use cursive::views::{Dialog, Panel, TextView};
 use cursive::Cursive;
 
 fn main() {
@@ -16,7 +17,7 @@ fn main() {
     // The text is too long to fit on a line, so the view will wrap lines,
     // and will adapt to the terminal size.
     siv.add_fullscreen_layer(
-        Dialog::around(Panel::new(ScrollView::new(TextView::new(content))))
+        Dialog::around(Panel::new(TextView::new(content).scrollable()))
             .title("Unicode and wide-character support")
             // This is the alignment for the button
             .h_align(HAlign::Center)

examples/scroll.rs

@@ -1,7 +1,8 @@
 extern crate cursive;
 
 use cursive::traits::Boxable;
-use cursive::views::{Button, Canvas, Dialog, LinearLayout, ScrollView};
+use cursive::view::Scrollable;
+use cursive::views::{Button, Canvas, Dialog, LinearLayout};
 use cursive::Printer;
 
 fn main() {
@@ -9,18 +10,12 @@ fn main() {
 
     siv.add_layer(
         Dialog::around(
-            ScrollView::new(
             LinearLayout::vertical()
-                    .child(Button::new("Foo", |s| {
-                        s.add_layer(Dialog::info("Ah"))
-                    }))
-                    .child(
-                        Canvas::new(()).with_draw(draw).fixed_size((120, 40)),
-                    )
-                    .child(Button::new("Bar", |s| {
-                        s.add_layer(Dialog::info("Uh"))
-                    })),
-            ).scroll_x(true),
+                .child(Button::new("Foo", |s| s.add_layer(Dialog::info("Ah"))))
+                .child(Canvas::new(()).with_draw(draw).fixed_size((120, 40)))
+                .child(Button::new("Bar", |s| s.add_layer(Dialog::info("Uh"))))
+                .scrollable()
+                .scroll_x(true),
         ).fixed_size((60, 30)),
     );
 

src/traits.rs

@@ -9,6 +9,7 @@
 //! ```
 
 #[doc(no_inline)]
-pub use view::{Boxable, Finder, Identifiable, View};
+pub use view::{Boxable, Finder, Identifiable, Scrollable, View};
+
 #[doc(no_inline)]
 pub use With;

src/view/mod.rs

@@ -52,6 +52,7 @@ mod view_path;
 mod boxable;
 mod identifiable;
 mod scroll;
+mod scrollable;
 
 mod into_boxed_view;
 
@@ -63,6 +64,7 @@ pub use self::into_boxed_view::IntoBoxedView;
 pub use self::margins::Margins;
 pub use self::position::{Offset, Position};
 pub use self::scroll::{ScrollBase, ScrollStrategy};
+pub use self::scrollable::Scrollable;
 pub use self::size_cache::SizeCache;
 pub use self::size_constraint::SizeConstraint;
 pub use self::view::View;

src/view/scrollable.rs

@@ -0,0 +1,14 @@
+use view::View;
+use views::ScrollView;
+
+/// Makes a view wrappable in a [`ScrollView`].
+///
+/// [`ScrollView`]: ::views::ScrollView
+pub trait Scrollable: View + Sized {
+    /// Wraps `self` in a `ScrollView`.
+    fn scrollable(self) -> ScrollView<Self> {
+        ScrollView::new(self)
+    }
+}
+
+impl<T: View> Scrollable for T {}