Textarea

import com.williamcallahan.tui4j.compat.bubbles.textarea.Textarea;
import com.williamcallahan.tui4j.compat.bubbletea.*;

public class App implements Model {

    private Textarea editor;

    public App() {
        editor = new Textarea();
        editor.setWidth(60);
        editor.setHeight(10);
        editor.setPlaceholder("Type something…");
        editor.focus();
    }

    @Override
    public Command init() { return null; }

    @Override
    public UpdateResult<App> update(Message msg) {
        if (msg instanceof KeyPressMessage kp && "esc".equals(kp.key())) {
            return UpdateResult.from(this, QuitMessage::new);
        }
        UpdateResult<Textarea> result = editor.update(msg);
        editor = result.model();
        return UpdateResult.from(this, result.command());
    }

    @Override
    public String view() {
        return "Notes:\n\n" + editor.view() + "\n\n(esc to quit)";
    }
}

Textarea editor = new Textarea();

editor.setValue("Hello\nWorld"); // Replace all content
String text = editor.value();    // Get the full content as a newline-separated string

editor.insertString(" appended"); // Insert at the current cursor position
editor.insertRune('!');           // Insert a single character

editor.reset(); // Clear all content and reset cursor to (0, 0)

editor.focus();              // Accept key events, apply focused style
editor.blur();               // Stop accepting input, apply blurred style
boolean active = editor.focused();

import com.williamcallahan.tui4j.compat.lipgloss.Borders;
import com.williamcallahan.tui4j.compat.lipgloss.Style;
import com.williamcallahan.tui4j.compat.lipgloss.color.Color;

editor.focusedStyle().base(
    Style.newStyle().border(Borders.normalBorder()).borderForeground(Color.color("62"))
);

editor.setWidth(80);    // Width in terminal cells
editor.setHeight(20);   // Number of visible lines

editor.setMaxWidth(120);  // Hard limit on width
editor.setMaxHeight(40);  // Hard limit on height

editor.setPlaceholder("Start typing your note here…");

editor.setCharLimit(2000); // 0 means unlimited

editor.setShowLineNumbers(true);

// Static prompt
editor.setPrompt("│ ");

// Dynamic prompt — receives the line number, returns a string
editor.setPromptFunc(4, lineNo -> lineNo % 2 == 0 ? "  " : "│ ");

Textarea.LineInfo info = editor.lineInfo();
// info.width()        — line width in characters
// info.charWidth()    — line width in cells
// info.height()       — number of wrapped sub-lines
// info.columnOffset() — cursor column within the wrapped line
// info.rowOffset()    — wrapped line index within the logical line
// info.charOffset()   — cursor offset in cells from line start

int lines = editor.lineCount(); // Total logical lines
int line  = editor.line();      // Current line index (0-based)
int len   = editor.length();    // Total character count
int w     = editor.width();
int h     = editor.height();