Add manual-loop methods

is_running() and step()

src/lib.rs

@@ -518,16 +518,38 @@ impl Cursive {
 
     }
 
+    /// Returns `true` until [`quit(&mut self)`] is called.
+    ///
+    /// [`quit(&mut self)`]: #method.quit
+    pub fn is_running(&self) -> bool {
+        self.running
+    }
+
+
     /// Runs the event loop.
     ///
     /// It will wait for user input (key presses)
     /// and trigger callbacks accordingly.
     ///
-    /// Blocks until `quit()` is called.
+    /// Calls [`step(&mut self)`] until [`quit(&mut self)`] is called.
+    ///
+    /// [`step(&mut self)`]: #method.step
+    /// [`quit(&mut self)`]: #method.quit
     pub fn run(&mut self) {
 
         // And the big event loop begins!
         while self.running {
+            self.step();
+        }
+    }
+
+    /// Performs a single step from the event loop.
+    ///
+    /// Useful if you need tighter control on the event loop.
+    /// Otherwise, [`run(&mut self)`] might be more convenient.
+    ///
+    /// [`run(&mut self)`]: #method.run
+    pub fn step(&mut self) {
         if let Ok(cb) = self.cb_source.try_recv() {
             cb(self);
         }
@@ -570,7 +592,6 @@ impl Cursive {
             }
         }
     }
-    }
 
     /// Stops the event loop.
     pub fn quit(&mut self) {