Add Dialog::empty and Dialog::content

Allows to set the content after the title, for when it's more
readable.

examples/list_view.rs

@@ -5,7 +5,10 @@ use cursive::prelude::*;
 fn main() {
     let mut siv = Cursive::new();
 
-    siv.add_layer(Dialog::new(ListView::new()
+    siv.add_layer(Dialog::empty()
+        .title("Please fill out this form")
+        .button("Ok", |s| s.quit())
+        .content(ListView::new()
             .child("Name", EditView::new().min_length(10))
             .child("Email",
                    LinearLayout::horizontal()
@@ -27,7 +30,8 @@ fn main() {
                    }))
             .delimiter()
             .child("Age",
-                   SelectView::new().popup()
+                   SelectView::new()
+                       .popup()
                        .item_str("0-18")
                        .item_str("19-30")
                        .item_str("31-40")
@@ -36,9 +40,7 @@ fn main() {
                 for i in 0..50 {
                     list.add_child(&format!("Item {}", i), EditView::new());
                 }
-            }))
-        .title("Please fill out this form")
-        .button("Ok", |s| s.quit()));
+            })));
 
     siv.run();
 }

examples/lorem.rs

@@ -18,9 +18,8 @@ fn main() {
         .h_align(HAlign::Center)
         .button("Quit", |s| s.quit()));
     // Show a popup on top of the view.
-    siv.add_layer(Dialog::new(TextView::new("Try resizing the terminal!\n(Press 'q' to quit \
-                                             when you're done.)"))
-                      .dismiss_button("Ok"));
+    siv.add_layer(Dialog::info("Try resizing the terminal!\n(Press 'q' to \
+                                quit when you're done.)"));
 
     siv.run();
 }

examples/progress.rs

@@ -10,12 +10,15 @@ use std::sync::atomic::{AtomicUsize, Ordering};
 fn main() {
     let mut siv = Cursive::new();
 
-    siv.add_layer(Dialog::new(Button::new("Start", |s| {
+    siv.add_layer(Dialog::empty()
+        .title("Progress bar example")
+        .padding((0, 0, 1, 1))
+        .content(Button::new("Start", |s| {
             // These two values will allow us to communicate.
             let value = Arc::new(AtomicUsize::new(0));
             let cb = Arc::new(Mutex::new(None));
 
-            let n_max = 1000;
+            let n_max = 100;
 
             s.pop_layer();
             s.add_layer(Panel::new(FullView::full_width(ProgressBar::new()
@@ -26,21 +29,19 @@ fn main() {
             // Spawn a thread to process things in the background.
             thread::spawn(move || {
                 for _ in 0..n_max {
-                    thread::sleep(Duration::from_millis(3));
+                    thread::sleep(Duration::from_millis(20));
                     value.fetch_add(1, Ordering::Relaxed);
                 }
                 *cb.lock().unwrap() = Some(Box::new(move |s| {
                     s.pop_layer();
-                    s.add_layer(Dialog::new(TextView::new("Phew, that was \
-                                                           a lot of work!"))
+                    s.add_layer(Dialog::empty()
                         .title("Work done!")
+                        .content(TextView::new("Phew, that was some work!"))
                         .button("Sure!", |s| s.quit()));
                 }));
             });
 
         }))
-        .title("Progress bar example")
-        .padding((0, 0, 1, 1))
         .with_id("dialog"));
 
     siv.set_fps(30);

src/view/dialog.rs

@@ -2,11 +2,12 @@ use std::cmp::max;
 use std::any::Any;
 
 use Cursive;
+use With;
 use direction::Direction;
 use align::*;
 use event::*;
 use theme::ColorStyle;
-use view::{Selector, TextView, View};
+use view::{DummyView, Selector, TextView, View};
 use view::{Button, SizedView};
 use vec::{Vec2, Vec4};
 use Printer;
@@ -43,7 +44,14 @@ pub struct Dialog {
 }
 
 impl Dialog {
-    /// Creates a new Dialog with the given content.
+    /// Creates a new `Dialog` with empty content.
+    ///
+    /// You should probably call `content()` next.
+    pub fn empty() -> Self {
+        Self::new(DummyView)
+    }
+
+    /// Creates a new `Dialog` with the given content.
     pub fn new<V: View + 'static>(view: V) -> Self {
         Dialog {
             content: Box::new(view),
@@ -56,6 +64,13 @@ impl Dialog {
         }
     }
 
+    /// Sets the content for this dialog.
+    ///
+    /// Chainable variant.
+    pub fn content<V: View + 'static>(self, view: V) -> Self {
+        self.with(|s| s.set_content(view))
+    }
+
     /// Sets the content for this dialog.
     ///
     /// Previous content will be dropped.

src/view/mod.rs

@@ -161,6 +161,16 @@ pub trait View {
     }
 }
 
+/// Dummy view.
+///
+/// Doesn't print anything. Minimal size is (1,1).
+pub struct DummyView;
+
+impl View for DummyView {
+    fn draw(&self, _: &Printer) {}
+}
+
+
 /// Cache around a one-dimensional layout result.
 ///
 /// This is not a View, but something to help you if you create your own Views.