Extended text_area example

examples/text_area.rs

@@ -1,12 +1,15 @@
 extern crate cursive;
 
 use cursive::Cursive;
+use cursive::event::{Event, Key};
 use cursive::traits::*;
-use cursive::views::{Dialog, TextArea};
+use cursive::views::{Dialog, EditView, OnEventView, TextArea};
 
 fn main() {
     let mut siv = Cursive::new();
 
+    // The main dialog will just have a textarea.
+    // Its size expand automatically with the content.
     siv.add_layer(
         Dialog::new()
             .title("Describe your issue")
@@ -15,5 +18,56 @@ fn main() {
             .button("Ok", Cursive::quit),
     );
 
+    // We'll add a find feature!
+    siv.add_layer(Dialog::info("Hint: press Ctrl-F to find in text!"));
+
+    siv.add_global_callback(Event::CtrlChar('f'), |s| {
+        // When Ctrl-F is pressed, show the Find popup.
+        // Pressing the Escape key will discard it.
+        s.add_layer(
+            OnEventView::new(
+                Dialog::new()
+                    .title("Find")
+                    .content(
+                        EditView::new()
+                            .on_submit(find)
+                            .with_id("edit")
+                            .min_width(10),
+                    )
+                    .button("Ok", |s| {
+                        let text = s.call_on_id(
+                            "edit",
+                            |view: &mut EditView| view.get_content(),
+                        ).unwrap();
+                        find(s, &text);
+                    })
+                    .button("Cancel", |s| s.pop_layer()),
+            ).on_event(Event::Key(Key::Esc), |s| s.pop_layer()),
+        )
+    });
+
     siv.run();
 }
+
+fn find(siv: &mut Cursive, text: &str) {
+    // First, remove the find popup
+    siv.pop_layer();
+
+    let res = siv.call_on_id("text", |v: &mut TextArea| {
+        // Find the given text from the text area content
+        // Possible improvement: search after the current cursor.
+        if let Some(i) = v.get_content().find(text) {
+            // If we found it, move the cursor
+            v.set_cursor(i);
+            Ok(())
+        } else {
+            // Otherwise, return an error so we can show a warning.
+            Err(())
+        }
+    });
+
+    if let Some(Err(())) = res {
+        // If we didn't find anything, tell the user!
+        siv.add_layer(Dialog::info(format!("`{}` not found", text)));
+    }
+}