Struct TextAreaState 

pub struct TextAreaState {
    pub lines: Vec<String>,
    pub cursor_line: usize,
    pub cursor_col: usize,
    pub scroll_y: usize,
    pub scroll_x: usize,
    pub visible_height: usize,
    pub focused: bool,
    pub enabled: bool,
    pub tab_config: TabConfig,
}

State for a multi-line text area.

Fields

lines: Vec<String>

Lines of text.

cursor_line: usize

Current line (0-indexed).

cursor_col: usize

Cursor column (character index within line).

scroll_y: usize

Vertical scroll offset.

scroll_x: usize

Horizontal scroll offset (for no-wrap mode).

visible_height: usize

Visible viewport height (set during render).

focused: bool

Whether the textarea has focus.

enabled: bool

Whether the textarea is enabled.

tab_config: TabConfig

Tab configuration.

Implementations

impl TextAreaState

pub fn new(text: impl Into<String>) -> Self

Create a new textarea state with initial text.

Cursor is positioned at the start of the text.

pub fn empty() -> Self

Create an empty textarea state.

pub fn with_tab_config(self, config: TabConfig) -> Self

Set the tab configuration.

pub fn insert_char(&mut self, c: char)

Insert a character at cursor position.

pub fn insert_str(&mut self, s: &str)

Insert a string at cursor position (handles multi-line input).

pub fn insert_newline(&mut self)

Insert a newline at cursor position.

pub fn insert_tab(&mut self)

Insert a tab (spaces or literal depending on config).

pub fn delete_char_backward(&mut self) -> bool

Delete character before cursor (backspace).

At the start of a line, merges with previous line. Returns true if any change was made.

pub fn delete_char_forward(&mut self) -> bool

Delete character at cursor (delete key).

At the end of a line, merges with next line. Returns true if any change was made.

pub fn delete_word_backward(&mut self) -> bool

Delete word before cursor.

Returns true if any characters were deleted.

pub fn delete_line(&mut self)

Delete entire current line.

If there’s only one line, clears it instead.

pub fn delete_to_line_start(&mut self)

Delete from cursor to line start (Ctrl+U).

pub fn delete_to_line_end(&mut self)

Delete from cursor to line end (Ctrl+K).

pub fn move_left(&mut self)

Move cursor left by one character.

At the start of a line, moves to end of previous line.

pub fn move_right(&mut self)

Move cursor right by one character.

At the end of a line, moves to start of next line.

pub fn move_line_start(&mut self)

Move cursor to start of line (Home).

pub fn move_line_end(&mut self)

Move cursor to end of line (End).

pub fn move_word_left(&mut self)

Move cursor left by one word.

pub fn move_word_right(&mut self)

Move cursor right by one word.

pub fn move_up(&mut self)

Move cursor up by one line.

pub fn move_down(&mut self)

Move cursor down by one line.

pub fn move_page_up(&mut self)

Move cursor up by one page.

pub fn move_page_down(&mut self)

Move cursor down by one page.

pub fn move_to_start(&mut self)

Move cursor to start of document (Ctrl+Home).

pub fn move_to_end(&mut self)

Move cursor to end of document (Ctrl+End).

pub fn scroll_to_cursor(&mut self)

Scroll to make cursor visible.

pub fn ensure_cursor_visible(&mut self)

Ensure cursor is visible (alias for scroll_to_cursor).

pub fn scroll_up(&mut self)

Scroll up by one line.

pub fn scroll_down(&mut self)

Scroll down by one line.

pub fn scroll_left(&mut self)

Scroll left (for no-wrap mode).

pub fn scroll_right(&mut self)

Scroll right (for no-wrap mode).

pub fn text(&self) -> String

Get full text content (all lines joined with newlines).

pub fn set_text(&mut self, text: impl Into<String>)

Set text content.

Cursor moves to the end.

pub fn clear(&mut self)

Clear all text.

pub fn line_count(&self) -> usize

Get number of lines.

pub fn current_line(&self) -> &str

Get current line content.

pub fn is_empty(&self) -> bool

Check if textarea is empty.

pub fn len(&self) -> usize

Get total character count (including newlines).

pub fn text_before_cursor(&self) -> &str

Get text before cursor on current line.

pub fn text_after_cursor(&self) -> &str

Get text after cursor on current line.

Trait Implementations

impl Clone for TextAreaState

fn clone(&self) -> TextAreaState

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for TextAreaState

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for TextAreaState

fn default() -> Self

Returns the “default value” for a type.