Add on_change callback to CheckBox

examples/list_view.rs

@@ -10,10 +10,15 @@ fn main() {
     siv.add_layer(Dialog::new(ListView::new()
                               .child("Name", EditView::new().min_length(10))
                               .child("Email", LinearLayout::horizontal()
-                                    .child(EditView::new().min_length(15))
+                                    .child(EditView::new().min_length(15).disabled().with_id("email1"))
                                     .child(TextView::new("@"))
-                                    .child(EditView::new().min_length(10)))
-                              .child("Receive spam?", Checkbox::new())
+                                    .child(EditView::new().min_length(10).disabled().with_id("email2")))
+                              .child("Receive spam?", Checkbox::new().on_change(|s, checked| {
+                                  for name in &["email1", "email2"] {
+                                    let view: &mut EditView = s.find_id(name).unwrap();
+                                    view.set_enabled(checked);
+                                  }
+                              }))
                               .delimiter()
                               .with(|list| {
                                   for i in 0..50 {

src/view/checkbox.rs

@@ -1,15 +1,19 @@
 use With;
+use Cursive;
 use Printer;
 use vec::Vec2;
 use view::View;
 use event::{Event, EventResult, Key};
 use direction::Direction;
 
+use std::rc::Rc;
+
 
 /// Checkable box.
-#[derive(Debug)]
 pub struct Checkbox {
     checked: bool,
+
+    on_change: Option<Rc<Fn(&mut Cursive, bool)>>,
 }
 
 new_default!(Checkbox);
@@ -17,24 +21,40 @@ new_default!(Checkbox);
 impl Checkbox {
     /// Creates a new, unchecked checkbox.
     pub fn new() -> Self {
-        Checkbox { checked: false }
+        Checkbox {
+            checked: false,
+            on_change: None,
+        }
+    }
+
+    /// Sets a callback to be used when the state changes.
+    pub fn set_on_change<F: 'static + Fn(&mut Cursive, bool)>(&mut self, on_change: F) {
+        self.on_change = Some(Rc::new(on_change));
+    }
+
+    /// Sets a callback to be used when the state changes.
+    ///
+    /// Chainable variant.
+    pub fn on_change<F: 'static + Fn(&mut Cursive, bool)>(self, on_change: F) -> Self {
+        self.with(|s| s.set_on_change(on_change))
     }
 
     /// Toggles the checkbox state.
-    pub fn toggle(&mut self) {
-        self.checked = !self.checked;
+    pub fn toggle(&mut self) -> EventResult {
+        let checked = !self.checked;
+        self.set_checked(checked)
     }
 
     /// Check the checkbox.
-    pub fn check(&mut self) {
-        self.checked = true;
+    pub fn check(&mut self) -> EventResult {
+        self.set_checked(true)
     }
 
     /// Check the checkbox.
     ///
     /// Chainable variant.
     pub fn checked(self) -> Self {
-        self.with(Self::check)
+        self.with(|s| {s.check();})
     }
 
     /// Returns `true` if the checkbox is checked.
@@ -43,15 +63,26 @@ impl Checkbox {
     }
 
     /// Uncheck the checkbox.
-    pub fn uncheck(&mut self) {
-        self.checked = false;
+    pub fn uncheck(&mut self) -> EventResult {
+        self.set_checked(false)
     }
 
     /// Uncheck the checkbox.
     ///
     /// Chainable variant.
     pub fn unchecked(self) -> Self {
-        self.with(Self::uncheck)
+        self.with(|s| { s.uncheck(); })
+    }
+
+    /// Sets the checkbox state.
+    pub fn set_checked(&mut self, checked: bool) -> EventResult {
+        self.checked = checked;
+        if let Some(ref on_change) = self.on_change {
+            let on_change = on_change.clone();
+            EventResult::with_cb(move |s| on_change(s, checked))
+        } else {
+            EventResult::Consumed(None)
+        }
     }
 }
 
@@ -78,9 +109,7 @@ impl View for Checkbox {
         match event {
             Event::Key(Key::Enter) |
             Event::Char(' ') => self.toggle(),
-            _ => return EventResult::Ignored,
-        }
-
-        EventResult::Consumed(None)
+            _ => EventResult::Ignored,
+        }
     }
 }

src/view/edit_view.rs

@@ -1,6 +1,7 @@
 use unicode_segmentation::UnicodeSegmentation;
 use unicode_width::UnicodeWidthStr;
 
+use With;
 use direction::Direction;
 use theme::{ColorStyle, Effect};
 use vec::Vec2;
@@ -23,8 +24,9 @@ pub struct EditView {
     /// (When the content is too long for the display, we hide part of it)
     offset: usize,
     /// Last display length, to know the possible offset range
-    last_length: usize, /* scrollable: bool,
-                         * TODO: add a max text length? */
+    last_length: usize,
+
+    enabled: bool,
 }
 
 new_default!(EditView);
@@ -38,9 +40,39 @@ impl EditView {
             offset: 0,
             min_length: 1,
             last_length: 0, // scrollable: false,
+            enabled: true,
         }
     }
 
+    /// Disables this view.
+    ///
+    /// A disabled view cannot be selected.
+    pub fn disable(&mut self) {
+        self.enabled = false;
+    }
+
+    /// Disables this view.
+    ///
+    /// Chainable variant.
+    pub fn disabled(self) -> Self {
+        self.with(Self::disable)
+    }
+
+    /// Re-enables this view.
+    pub fn enable(&mut self) {
+        self.enabled = true;
+    }
+
+    /// Enable or disable this view.
+    pub fn set_enabled(&mut self, enabled: bool) {
+        self.enabled = enabled;
+    }
+
+    /// Returns `true` if this view is enabled.
+    pub fn is_enabled(&self) -> bool {
+        self.enabled
+    }
+
     /// Replace the entire content of the view with the given one.
     pub fn set_content(&mut self, content: &str) {
         self.offset = 0;
@@ -83,7 +115,12 @@ impl View for EditView {
 
         let width = self.content.width();
         printer.with_color(ColorStyle::Secondary, |printer| {
-            printer.with_effect(Effect::Reverse, |printer| {
+            let effect = if self.enabled {
+                Effect::Reverse
+            } else {
+                Effect::Simple
+            };
+            printer.with_effect(effect, |printer| {
                 if width < self.last_length {
                     // No problem, everything fits.
                     printer.print((0, 0), &self.content);
@@ -145,7 +182,7 @@ impl View for EditView {
     }
 
     fn take_focus(&mut self, _: Direction) -> bool {
-        true
+        self.enabled
     }
 
     fn on_event(&mut self, event: Event) -> EventResult {

src/view/linear_layout.rs

@@ -1,11 +1,12 @@
 use XY;
 use direction;
 use view::View;
-use view::SizeCache;
+use view::{Selector, SizeCache};
 use vec::Vec2;
 use Printer;
 use event::{Event, EventResult, Key};
 
+use std::any::Any;
 use std::cmp::min;
 
 /// Arranges its children linearly according to its orientation.
@@ -366,4 +367,8 @@ impl View for LinearLayout {
             res => res,
         }
     }
+
+    fn find(&mut self, selector: &Selector) -> Option<&mut Any> {
+        self.children.iter_mut().filter_map(|c| c.view.find(selector)).next()
+    }
 }

src/view/list_view.rs

@@ -2,10 +2,13 @@ use Printer;
 use With;
 use vec::Vec2;
 use view::View;
+use view::Selector;
 use direction;
 use view::scroll::ScrollBase;
 use event::{Event, EventResult, Key};
 
+use std::any::Any;
+
 enum Child {
     Row(String, Box<View>),
     Delimiter,
@@ -261,4 +264,8 @@ impl View for ListView {
         self.scrollbase.scroll_to(self.focus);
         true
     }
+
+    fn find(&mut self, selector: &Selector) -> Option<&mut Any> {
+        self.children.iter_mut().filter_map(Child::view).filter_map(|v| v.find(selector)).next()
+    }
 }