add multi example

examples/multi.rs

@@ -0,0 +1,88 @@
+use crossterm::event::{DisableMouseCapture, EnableMouseCapture};
+use crossterm::terminal::{
+    disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen,
+};
+use std::io;
+use tui::backend::CrosstermBackend;
+use tui::layout::{Constraint, Direction, Layout};
+use tui::style::{Color, Modifier, Style};
+use tui::widgets::{Block, Borders};
+use tui::Terminal;
+use tui_textarea::{Input, Key, TextArea};
+
+fn inactivate(textarea: &mut TextArea<'_>) {
+    textarea.set_cursor_line_style(Style::default());
+    textarea.set_cursor_style(Style::default());
+    let b = textarea
+        .block()
+        .cloned()
+        .unwrap_or_else(|| Block::default().borders(Borders::ALL));
+    textarea.set_block(
+        b.style(Style::default().fg(Color::DarkGray))
+            .title(" Inactive (^X to switch) "),
+    );
+}
+
+fn activate(textarea: &mut TextArea<'_>) {
+    textarea.set_cursor_line_style(Style::default().add_modifier(Modifier::UNDERLINED));
+    textarea.set_cursor_style(Style::default().add_modifier(Modifier::REVERSED));
+    let b = textarea
+        .block()
+        .cloned()
+        .unwrap_or_else(|| Block::default().borders(Borders::ALL));
+    textarea.set_block(b.style(Style::default()).title(" Active "));
+}
+
+fn main() -> io::Result<()> {
+    let stdout = io::stdout();
+    let mut stdout = stdout.lock();
+    enable_raw_mode()?;
+    crossterm::execute!(stdout, EnterAlternateScreen, EnableMouseCapture)?;
+    let backend = CrosstermBackend::new(stdout);
+    let mut term = Terminal::new(backend)?;
+
+    let mut textarea = [TextArea::default(), TextArea::default()];
+
+    let layout = Layout::default()
+        .direction(Direction::Horizontal)
+        .constraints([Constraint::Percentage(50), Constraint::Percentage(50)].as_ref());
+
+    let mut which = 0;
+    activate(&mut textarea[0]);
+    inactivate(&mut textarea[1]);
+
+    loop {
+        term.draw(|f| {
+            let chunks = layout.split(f.size());
+            for (textarea, chunk) in textarea.iter().zip(chunks) {
+                let widget = textarea.widget();
+                f.render_widget(widget, chunk);
+            }
+        })?;
+        match Input::from(crossterm::event::read()?) {
+            Input { key: Key::Esc, .. } => break,
+            Input {
+                key: Key::Char('x'),
+                ctrl: true,
+                ..
+            } => {
+                inactivate(&mut textarea[which]);
+                which = (which + 1) % 2;
+                activate(&mut textarea[which]);
+            }
+            input => {
+                textarea[which].input(input);
+            }
+        }
+    }
+
+    disable_raw_mode()?;
+    crossterm::execute!(
+        term.backend_mut(),
+        LeaveAlternateScreen,
+        DisableMouseCapture
+    )?;
+    term.show_cursor()?;
+
+    Ok(())
+}