Improved lorem example

TODO: add margins around the textview?

examples/lorem.rs

@@ -2,6 +2,7 @@ extern crate cursive;
 
 use cursive::Cursive;
 use cursive::view::TextView;
+use cursive::view::Dialog;
 
 use std::fs::File;
 use std::io::Read;
@@ -9,7 +10,7 @@ use std::io::Read;
 fn main() {
     let mut siv = Cursive::new();
 
-    // Read some long text to showcase the layout
+    // Read some long text from a file.
     let mut file = File::open("assets/lorem.txt").unwrap();
     let mut content = String::new();
     file.read_to_string(&mut content).unwrap();
@@ -17,7 +18,12 @@ fn main() {
     // We can quit by pressing q
     siv.add_global_callback('q' as i32, |s,_| s.quit());
 
+    // 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_layer(TextView::new(&content));
+    // 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.run();
 }

src/view/dialog.rs

@@ -59,6 +59,13 @@ impl Dialog {
         self
     }
 
+    /// Shortcut method to add a button that will dismiss the dialog.
+    pub fn dismiss_button<'a>(self, label: &'a str) -> Self {
+        self.button(label, |s, _| s.screen_mut().pop_layer())
+    }
+
+    /// Sets the title of the dialog.
+    /// If not empty, it will be visible at the top.
     pub fn title(mut self, label: &str) -> Self {
         self.title = label.to_string();
         self