Add View::as_any and View::as_any_mut

examples/key_codes.rs

@@ -1,3 +1,4 @@
+#[macro_use]
 extern crate cursive;
 
 use cursive::{Cursive, Printer};
@@ -30,6 +31,8 @@ impl KeyCodeView {
 }
 
 impl View for KeyCodeView {
+    view_any!();
+
     fn draw(&self, printer: &Printer) {
         // We simply draw every event from the history.
         for (y, line) in self.history.iter().enumerate() {

examples/logs.rs

@@ -1,3 +1,4 @@
+#[macro_use]
 extern crate cursive;
 
 use cursive::{Cursive, Printer};
@@ -80,6 +81,8 @@ impl BufferView {
 }
 
 impl View for BufferView {
+    view_any!();
+
     fn layout(&mut self, _: Vec2) {
         // Before drawing, we'll want to update the buffer
         self.update();

src/view/mod.rs

@@ -35,6 +35,15 @@
 //!   no matter what the request is. This means calling `View::layout()` with
 //!   a size returned by `required_size` is **never** an error.
 
+/// Helper macro to implement `View::as_any` and `View::as_any_mut`
+#[macro_export]
+macro_rules! view_any {
+    () => {
+        fn as_any(&self) -> &::std::any::Any { self }
+        fn as_any_mut(&mut self) -> &mut ::std::any::Any { self }
+    }
+}
+
 #[macro_use]
 mod view_wrapper;
 
@@ -73,6 +82,12 @@ pub trait View: Any {
         EventResult::Ignored
     }
 
+    /// Downcast self to a `Any`.
+    fn as_any(&self) -> &Any;
+
+    /// Downcast self to a mutable `Any`.
+    fn as_any_mut(&mut self) -> &mut Any;
+
     /// Returns the minimum size the view requires with the given restrictions.
     ///
     /// If the view is flexible (it has multiple size options), it can try

src/view/view_wrapper.rs

@@ -119,6 +119,8 @@ impl<U: View + ?Sized, T: Deref<Target = U> + DerefMut + 'static> ViewWrapper
 
 // The main point of implementing ViewWrapper is to have View for free.
 impl<T: ViewWrapper> View for T {
+    view_any!();
+
     fn draw(&self, printer: &Printer) {
         self.wrap_draw(printer);
     }

src/views/button.rs

@@ -126,6 +126,8 @@ impl Button {
 }
 
 impl View for Button {
+    view_any!();
+
     fn draw(&self, printer: &Printer) {
         if printer.size.x == 0 {
             return;

src/views/canvas.rs

@@ -173,6 +173,8 @@ impl<T> Canvas<T> {
 }
 
 impl<T: 'static> View for Canvas<T> {
+    view_any!();
+
     fn draw(&self, printer: &Printer) {
         (self.draw)(&self.state, printer);
     }

src/views/checkbox.rs

@@ -105,6 +105,8 @@ impl Checkbox {
 }
 
 impl View for Checkbox {
+    view_any!();
+
     fn required_size(&mut self, _: Vec2) -> Vec2 {
         Vec2::new(3, 1)
     }

src/views/dialog.rs

@@ -423,6 +423,8 @@ impl Dialog {
 }
 
 impl View for Dialog {
+    view_any!();
+
     fn draw(&self, printer: &Printer) {
         // This will be the buttons_height used by the buttons.
         let buttons_height = match self.draw_buttons(printer) {

src/views/dummy.rs

@@ -7,5 +7,7 @@ use view::View;
 pub struct DummyView;
 
 impl View for DummyView {
+    view_any!();
+
     fn draw(&self, _: &Printer) {}
 }

src/views/edit_view.rs

@@ -434,6 +434,8 @@ fn make_small_stars(length: usize) -> &'static str {
 }
 
 impl View for EditView {
+    view_any!();
+
     fn draw(&self, printer: &Printer) {
         assert_eq!(
             printer.size.x,

src/views/linear_layout.rs

@@ -297,6 +297,8 @@ fn try_focus(
 }
 
 impl View for LinearLayout {
+    view_any!();
+
     fn draw(&self, printer: &Printer) {
         // Use pre-computed sizes
         // eprintln!("Pre loop!");

src/views/list_view.rs

@@ -261,6 +261,9 @@ fn try_focus(
 }
 
 impl View for ListView {
+    view_any!();
+
+
     fn draw(&self, printer: &Printer) {
         if self.children.is_empty() {
             return;

src/views/menu_popup.rs

@@ -199,6 +199,8 @@ impl MenuPopup {
 }
 
 impl View for MenuPopup {
+    view_any!();
+
     fn draw(&self, printer: &Printer) {
         if !printer.size.fits((2, 2)) {
             return;

src/views/menubar.rs

@@ -259,6 +259,8 @@ fn show_child(s: &mut Cursive, offset: Vec2, menu: Rc<MenuTree>) {
 }
 
 impl View for Menubar {
+    view_any!();
+
     fn draw(&self, printer: &Printer) {
         // Draw the bar at the top
         printer.with_color(ColorStyle::primary(), |printer| {

src/views/progress_bar.rs

@@ -193,6 +193,8 @@ impl ProgressBar {
 }
 
 impl View for ProgressBar {
+    view_any!();
+
     fn draw(&self, printer: &Printer) {
         // Now, the bar itself...
         let available = printer.size.x;

src/views/radio.rs

@@ -154,6 +154,9 @@ impl<T> RadioButton<T> {
 }
 
 impl<T: 'static> View for RadioButton<T> {
+    view_any!();
+
+
     fn required_size(&mut self, _: Vec2) -> Vec2 {
         self.req_size()
     }

src/views/select_view.rs

@@ -570,6 +570,9 @@ impl SelectView<String> {
 }
 
 impl<T: 'static> View for SelectView<T> {
+    view_any!();
+
+
     fn draw(&self, printer: &Printer) {
         self.last_offset.set(printer.offset);
 

src/views/slider_view.rs

@@ -112,6 +112,8 @@ impl SliderView {
 }
 
 impl View for SliderView {
+    view_any!();
+
     fn draw(&self, printer: &Printer) {
         match self.orientation {
             Orientation::Vertical => {

src/views/stack_view.rs

@@ -71,6 +71,8 @@ impl<T: View> ChildWrapper<T> {
 
 // TODO: use macros to make this less ugly?
 impl<T: View> View for ChildWrapper<T> {
+    view_any!();
+
     fn draw(&self, printer: &Printer) {
         match *self {
             ChildWrapper::Shadow(ref v) => v.draw(printer),
@@ -322,6 +324,8 @@ impl<R: Deref<Target = Child>, I: Iterator<Item = R>> Iterator
 }
 
 impl View for StackView {
+    view_any!();
+
     fn draw(&self, printer: &Printer) {
         let last = self.layers.len();
         printer.with_color(ColorStyle::primary(), |printer| {

src/views/text_area.rs

@@ -396,6 +396,8 @@ impl TextArea {
 }
 
 impl View for TextArea {
+    view_any!();
+
     fn required_size(&mut self, constraint: Vec2) -> Vec2 {
         // Make sure our structure is up to date
         self.soft_compute_rows(constraint);

src/views/text_view.rs

@@ -448,6 +448,8 @@ impl TextView {
 }
 
 impl View for TextView {
+    view_any!();
+
     fn draw(&self, printer: &Printer) {
         let h = self.rows.len();
         // If the content is smaller than the view, align it somewhere.