398 lines
12 KiB
Rust
398 lines
12 KiB
Rust
// examples/textarea_normal.rs
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//! Demonstrates automatic cursor management with the textarea widget
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//!
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//! This example REQUIRES the `cursor-style` and `textarea` features to compile,
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//! and is adapted for `textmode-normal` (always editing, no vim modes).
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//!
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//! Run with:
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//! cargo run --example canvas_textarea_cursor_auto_normal --features "gui,cursor-style,textarea,textmode-normal"
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#[cfg(not(feature = "cursor-style"))]
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compile_error!(
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"This example requires the 'cursor-style' feature. \
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Run with: cargo run --example canvas_textarea_cursor_auto_normal --features \"gui,cursor-style,textarea,textmode-normal\""
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);
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#[cfg(not(feature = "textarea"))]
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compile_error!(
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"This example requires the 'textarea' feature. \
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Run with: cargo run --example canvas_textarea_cursor_auto_normal --features \"gui,cursor-style,textarea,textmode-normal\""
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);
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use std::io;
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use crossterm::{
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event::{self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode, KeyEvent, KeyModifiers},
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execute,
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terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
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};
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use ratatui::{
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backend::{Backend, CrosstermBackend},
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layout::{Constraint, Direction, Layout},
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style::{Color, Style},
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text::{Line, Span},
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widgets::{Block, Borders, Paragraph},
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Frame, Terminal,
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};
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use canvas::{
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canvas::CursorManager,
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textarea::{TextArea, TextAreaState},
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};
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/// TextArea demo adapted for NORMALMODE (always editing)
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struct AutoCursorTextArea {
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textarea: TextAreaState,
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has_unsaved_changes: bool,
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debug_message: String,
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command_buffer: String,
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}
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impl AutoCursorTextArea {
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fn new() -> Self {
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let initial_text = "🎯 Automatic Cursor Management Demo (NORMALMODE)\n\
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Welcome to the textarea cursor demo!\n\
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\n\
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This demo runs in NORMALMODE:\n\
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• Always editing (no insert/normal toggle)\n\
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• Cursor is always underscore _\n\
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\n\
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Navigation commands:\n\
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• hjkl or arrow keys: move cursor\n\
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• w/b/e/W/B/E: word movements\n\
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• 0/$: line start/end\n\
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• g/gG: first/last line\n\
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\n\
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Editing commands:\n\
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• x/X: delete characters\n\
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\n\
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Press ? for help, Ctrl+Q to quit.";
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let mut textarea = TextAreaState::from_text(initial_text);
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textarea.set_placeholder("Start typing...");
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Self {
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textarea,
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has_unsaved_changes: false,
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debug_message: "🎯 NORMALMODE Demo - always editing".to_string(),
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command_buffer: String::new(),
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}
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}
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fn handle_textarea_input(&mut self, key: KeyEvent) {
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self.textarea.input(key);
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self.has_unsaved_changes = true;
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}
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fn move_left(&mut self) {
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self.textarea.move_left();
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self.debug_message = "← left".to_string();
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}
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fn move_right(&mut self) {
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self.textarea.move_right();
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self.debug_message = "→ right".to_string();
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}
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fn move_up(&mut self) {
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self.textarea.move_up();
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self.debug_message = "↑ up".to_string();
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}
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fn move_down(&mut self) {
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self.textarea.move_down();
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self.debug_message = "↓ down".to_string();
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}
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fn move_word_next(&mut self) {
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self.textarea.move_word_next();
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self.debug_message = "w: next word".to_string();
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}
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fn move_word_prev(&mut self) {
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self.textarea.move_word_prev();
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self.debug_message = "b: previous word".to_string();
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}
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fn move_word_end(&mut self) {
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self.textarea.move_word_end();
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self.debug_message = "e: word end".to_string();
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}
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fn move_word_end_prev(&mut self) {
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self.textarea.move_word_end_prev();
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self.debug_message = "ge: previous word end".to_string();
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}
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fn move_line_start(&mut self) {
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self.textarea.move_line_start();
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self.debug_message = "0: line start".to_string();
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}
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fn move_line_end(&mut self) {
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self.textarea.move_line_end();
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self.debug_message = "$: line end".to_string();
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}
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fn move_first_line(&mut self) {
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self.textarea.move_first_line();
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self.debug_message = "gg: first line".to_string();
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}
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fn move_last_line(&mut self) {
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self.textarea.move_last_line();
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self.debug_message = "G: last line".to_string();
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}
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fn delete_char_forward(&mut self) {
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if let Ok(_) = self.textarea.delete_forward() {
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self.has_unsaved_changes = true;
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self.debug_message = "x: deleted character".to_string();
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}
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}
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fn delete_char_backward(&mut self) {
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if let Ok(_) = self.textarea.delete_backward() {
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self.has_unsaved_changes = true;
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self.debug_message = "X: deleted character backward".to_string();
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}
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}
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fn clear_command_buffer(&mut self) {
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self.command_buffer.clear();
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}
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fn add_to_command_buffer(&mut self, ch: char) {
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self.command_buffer.push(ch);
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}
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fn get_command_buffer(&self) -> &str {
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&self.command_buffer
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}
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fn has_pending_command(&self) -> bool {
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!self.command_buffer.is_empty()
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}
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fn debug_message(&self) -> &str {
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&self.debug_message
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}
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fn set_debug_message(&mut self, msg: String) {
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self.debug_message = msg;
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}
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fn has_unsaved_changes(&self) -> bool {
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self.has_unsaved_changes
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}
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fn get_cursor_info(&self) -> String {
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format!(
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"Line {}, Col {}",
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self.textarea.current_field() + 1,
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self.textarea.cursor_position() + 1
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)
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}
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// === BIG WORD MOVEMENTS ===
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fn move_big_word_next(&mut self) {
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self.textarea.move_big_word_next();
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self.debug_message = "W: next WORD".to_string();
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}
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fn move_big_word_prev(&mut self) {
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self.textarea.move_big_word_prev();
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self.debug_message = "B: previous WORD".to_string();
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}
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fn move_big_word_end(&mut self) {
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self.textarea.move_big_word_end();
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self.debug_message = "E: WORD end".to_string();
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}
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fn move_big_word_end_prev(&mut self) {
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self.textarea.move_big_word_end_prev();
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self.debug_message = "gE: previous WORD end".to_string();
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}
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}
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/// Handle key press in NORMALMODE (always editing, casual editor style)
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fn handle_key_press(
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key_event: KeyEvent,
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editor: &mut AutoCursorTextArea,
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) -> anyhow::Result<bool> {
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let KeyEvent {
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code: key,
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modifiers,
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..
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} = key_event;
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// Quit
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if (key == KeyCode::Char('q') && modifiers.contains(KeyModifiers::CONTROL))
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|| (key == KeyCode::Char('c') && modifiers.contains(KeyModifiers::CONTROL))
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|| key == KeyCode::F(10)
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{
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return Ok(false);
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}
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match (key, modifiers) {
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// Movement
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(KeyCode::Left, _) => editor.move_left(),
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(KeyCode::Right, _) => editor.move_right(),
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(KeyCode::Up, _) => editor.move_up(),
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(KeyCode::Down, _) => editor.move_down(),
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// Word movement (Ctrl+Arrows)
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(KeyCode::Left, m) if m.contains(KeyModifiers::CONTROL) => editor.move_word_prev(),
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(KeyCode::Right, m) if m.contains(KeyModifiers::CONTROL) => editor.move_word_next(),
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(KeyCode::Right, m) if m.contains(KeyModifiers::CONTROL | KeyModifiers::SHIFT) => {
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editor.move_word_end()
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}
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// Line/document movement
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(KeyCode::Home, _) => editor.move_line_start(),
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(KeyCode::End, _) => editor.move_line_end(),
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(KeyCode::Home, m) if m.contains(KeyModifiers::CONTROL) => editor.move_first_line(),
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(KeyCode::End, m) if m.contains(KeyModifiers::CONTROL) => editor.move_last_line(),
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// Delete
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(KeyCode::Delete, _) => editor.delete_char_forward(),
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(KeyCode::Backspace, _) => editor.delete_char_backward(),
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(KeyCode::F(1), _) => {
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// Switch to indicator mode
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editor.textarea.use_overflow_indicator('$');
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editor.set_debug_message("Overflow: indicator '$' (wrap OFF)".to_string());
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}
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(KeyCode::F(2), _) => {
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// Switch to wrap mode
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editor.textarea.use_wrap();
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editor.set_debug_message("Overflow: wrap ON".to_string());
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}
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(KeyCode::F(3), _) => {
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editor.textarea.set_wrap_indent_cols(3);
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editor.set_debug_message("Wrap indent: 3 columns".to_string());
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}
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(KeyCode::F(4), _) => {
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editor.textarea.set_wrap_indent_cols(0);
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editor.set_debug_message("Wrap indent: 0 columns".to_string());
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}
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// Debug/info
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(KeyCode::Char('?'), _) => {
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editor.set_debug_message(format!(
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"{}, Mode: NORMALMODE (casual editor, underscore cursor)",
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editor.get_cursor_info()
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));
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editor.clear_command_buffer();
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}
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// Default: treat as text input
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_ => editor.handle_textarea_input(key_event),
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}
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Ok(true)
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}
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fn run_app<B: Backend>(terminal: &mut Terminal<B>, mut editor: AutoCursorTextArea) -> io::Result<()> {
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loop {
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terminal.draw(|f| ui(f, &mut editor))?;
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if let Event::Key(key) = event::read()? {
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match handle_key_press(key, &mut editor) {
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Ok(should_continue) => {
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if !should_continue {
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break;
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}
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}
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Err(e) => {
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editor.set_debug_message(format!("Error: {e}"));
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}
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}
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}
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}
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Ok(())
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}
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fn ui(f: &mut Frame, editor: &mut AutoCursorTextArea) {
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let chunks = Layout::default()
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.direction(Direction::Vertical)
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.constraints([Constraint::Min(8), Constraint::Length(8)])
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.split(f.area());
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render_textarea(f, chunks[0], editor);
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render_status_and_help(f, chunks[1], editor);
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}
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fn render_textarea(f: &mut Frame, area: ratatui::layout::Rect, editor: &mut AutoCursorTextArea) {
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let block = Block::default()
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.borders(Borders::ALL)
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.title("🎯 Textarea with NORMALMODE (always editing)");
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let textarea_widget = TextArea::default().block(block.clone());
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f.render_stateful_widget(textarea_widget, area, &mut editor.textarea);
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let (cx, cy) = editor.textarea.cursor(area, Some(&block));
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f.set_cursor_position((cx, cy));
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}
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fn render_status_and_help(f: &mut Frame, area: ratatui::layout::Rect, editor: &AutoCursorTextArea) {
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let chunks = Layout::default()
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.direction(Direction::Vertical)
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.constraints([Constraint::Length(3), Constraint::Length(5)])
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.split(area);
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let status_text = if editor.has_pending_command() {
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format!(
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"-- NORMALMODE (underscore cursor) -- {} [{}]",
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editor.debug_message(),
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editor.get_command_buffer()
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)
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} else if editor.has_unsaved_changes() {
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format!(
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"-- NORMALMODE (underscore cursor) -- [Modified] {} | {}",
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editor.debug_message(),
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editor.get_cursor_info()
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)
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} else {
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format!(
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"-- NORMALMODE (underscore cursor) -- {} | {}",
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editor.debug_message(),
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editor.get_cursor_info()
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)
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};
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let status = Paragraph::new(Line::from(Span::raw(status_text)))
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.block(Block::default().borders(Borders::ALL).title("🎯 Cursor Status"));
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f.render_widget(status, chunks[0]);
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let help_text = "🎯 NORMALMODE (always editing)\n\
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hjkl/arrows=move, w/b/e=words, W/B/E=WORDS, 0/$=line, g/G=first/last\n\
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x/X=delete, typing inserts text\n\
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?=info, Ctrl+Q=quit";
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let help = Paragraph::new(help_text)
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.block(Block::default().borders(Borders::ALL).title("🚀 Help"))
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.style(Style::default().fg(Color::Gray));
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f.render_widget(help, chunks[1]);
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}
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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println!("🎯 Canvas Textarea Cursor Auto Demo (NORMALMODE)");
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println!("✅ cursor-style feature: ENABLED");
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println!("✅ textarea feature: ENABLED");
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println!("✅ textmode-normal feature: ENABLED");
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println!("🚀 Always editing, underscore cursor active");
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println!();
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enable_raw_mode()?;
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let mut stdout = io::stdout();
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execute!(stdout, EnterAlternateScreen, EnableMouseCapture)?;
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let backend = CrosstermBackend::new(stdout);
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let mut terminal = Terminal::new(backend)?;
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let editor = AutoCursorTextArea::new();
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let res = run_app(&mut terminal, editor);
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CursorManager::reset()?;
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disable_raw_mode()?;
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execute!(terminal.backend_mut(), LeaveAlternateScreen, DisableMouseCapture)?;
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terminal.show_cursor()?;
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if let Err(err) = res {
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println!("{err:?}");
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}
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println!("🎯 Cursor automatically reset to default!");
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Ok(())
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}
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