first textarea implementation
This commit is contained in:
Priec
@@ -63,3 +63,11 @@ pub use canvas::gui::render_canvas_default;
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#[cfg(all(feature = "gui", feature = "suggestions"))]
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pub use suggestions::gui::render_suggestions_dropdown;
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// First-class textarea module and exports
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#[cfg(feature = "textarea")]
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pub mod textarea;
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#[cfg(feature = "textarea")]
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pub use textarea::{TextArea, TextAreaProvider, TextAreaState, TextAreaEditor};
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14
canvas/src/textarea/mod.rs
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14
canvas/src/textarea/mod.rs
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@@ -0,0 +1,14 @@
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// src/textarea/mod.rs
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// Module routing and re-exports only. No logic here.
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pub mod provider;
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pub mod state;
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#[cfg(feature = "gui")]
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pub mod widget;
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pub use provider::TextAreaProvider;
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pub use state::{TextAreaEditor, TextAreaState};
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#[cfg(feature = "gui")]
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pub use widget::TextArea;
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113
canvas/src/textarea/provider.rs
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113
canvas/src/textarea/provider.rs
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@@ -0,0 +1,113 @@
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// src/textarea/provider.rs
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use crate::DataProvider;
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#[derive(Debug, Clone)]
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pub struct TextAreaProvider {
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lines: Vec<String>,
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name: String,
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}
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impl Default for TextAreaProvider {
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fn default() -> Self {
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Self {
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lines: vec![String::new()],
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name: "Text".to_string(),
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}
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}
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}
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impl TextAreaProvider {
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pub fn from_text<S: Into<String>>(text: S) -> Self {
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let text = text.into();
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let mut lines: Vec<String> =
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text.split('\n').map(|s| s.to_string()).collect();
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if lines.is_empty() {
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lines.push(String::new());
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}
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Self {
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lines,
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name: "Text".to_string(),
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}
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}
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pub fn to_text(&self) -> String {
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self.lines.join("\n")
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}
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pub fn set_text<S: Into<String>>(&mut self, text: S) {
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let text = text.into();
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self.lines = text.split('\n').map(|s| s.to_string()).collect();
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if self.lines.is_empty() {
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self.lines.push(String::new());
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}
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}
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pub fn line_count(&self) -> usize {
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self.lines.len()
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}
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#[inline]
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fn char_to_byte_index(s: &str, char_idx: usize) -> usize {
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s.char_indices()
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.nth(char_idx)
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.map(|(i, _)| i)
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.unwrap_or_else(|| s.len())
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}
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pub fn split_line_at(&mut self, line_idx: usize, at_char: usize) -> usize {
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if line_idx >= self.lines.len() {
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return self.lines.len().saturating_sub(1);
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}
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let line = &mut self.lines[line_idx];
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let byte_idx = Self::char_to_byte_index(line, at_char);
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let right = line[byte_idx..].to_string();
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line.truncate(byte_idx);
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let insert_at = line_idx + 1;
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self.lines.insert(insert_at, right);
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insert_at
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}
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pub fn join_with_next(&mut self, line_idx: usize) -> Option<usize> {
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if line_idx + 1 >= self.lines.len() {
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return None;
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}
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let left_len = self.lines[line_idx].chars().count();
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let right = self.lines.remove(line_idx + 1);
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self.lines[line_idx].push_str(&right);
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Some(left_len)
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}
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pub fn join_with_prev(
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&mut self,
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line_idx: usize,
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) -> Option<(usize, usize)> {
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if line_idx == 0 || line_idx >= self.lines.len() {
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return None;
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}
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let prev_idx = line_idx - 1;
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let prev_len = self.lines[prev_idx].chars().count();
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let curr = self.lines.remove(line_idx);
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self.lines[prev_idx].push_str(&curr);
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Some((prev_idx, prev_len))
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}
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}
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impl DataProvider for TextAreaProvider {
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fn field_count(&self) -> usize {
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self.lines.len()
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}
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fn field_name(&self, _index: usize) -> &str {
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&self.name
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}
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fn field_value(&self, index: usize) -> &str {
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self.lines.get(index).map(|s| s.as_str()).unwrap_or("")
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}
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fn set_field_value(&mut self, index: usize, value: String) {
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if index < self.lines.len() {
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self.lines[index] = value;
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}
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}
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}
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224
canvas/src/textarea/state.rs
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224
canvas/src/textarea/state.rs
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@@ -0,0 +1,224 @@
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// src/textarea/state.rs
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use crate::editor::FormEditor;
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use crate::textarea::provider::TextAreaProvider;
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use crossterm::event::{KeyCode, KeyEvent, KeyEventKind, KeyModifiers};
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#[cfg(feature = "gui")]
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use ratatui::{layout::Rect, widgets::Block};
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#[cfg(feature = "gui")]
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use unicode_width::UnicodeWidthChar;
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pub type TextAreaEditor = FormEditor<TextAreaProvider>;
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pub struct TextAreaState {
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pub(crate) editor: TextAreaEditor,
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pub(crate) scroll_y: u16,
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pub(crate) wrap: bool,
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pub(crate) placeholder: Option<String>,
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}
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impl Default for TextAreaState {
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fn default() -> Self {
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Self {
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editor: FormEditor::new(TextAreaProvider::default()),
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scroll_y: 0,
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wrap: false,
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placeholder: None,
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}
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}
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}
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impl TextAreaState {
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pub fn from_text<S: Into<String>>(text: S) -> Self {
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let provider = TextAreaProvider::from_text(text);
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Self {
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editor: FormEditor::new(provider),
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scroll_y: 0,
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wrap: false,
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placeholder: None,
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}
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}
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pub fn text(&self) -> String {
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self.editor.data_provider().to_text()
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}
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pub fn set_text<S: Into<String>>(&mut self, text: S) {
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self.editor.data_provider_mut().set_text(text);
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// Reset to first line and col 0
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self.editor.ui_state.current_field = 0;
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self.editor.ui_state.cursor_pos = 0;
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self.editor.ui_state.ideal_cursor_column = 0;
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}
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pub fn set_wrap(&mut self, wrap: bool) {
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self.wrap = wrap;
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}
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pub fn set_placeholder<S: Into<String>>(&mut self, s: S) {
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self.placeholder = Some(s.into());
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}
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// Editing primitives specific to multi-line buffer
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pub fn insert_newline(&mut self) {
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let line_idx = self.editor.current_field();
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let col = self.editor.cursor_position();
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let new_idx = self
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.editor
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.data_provider_mut()
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.split_line_at(line_idx, col);
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let _ = self.editor.transition_to_field(new_idx);
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self.editor.move_line_start();
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self.editor.enter_edit_mode();
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}
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pub fn backspace(&mut self) {
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let col = self.editor.cursor_position();
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if col > 0 {
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let _ = self.editor.delete_backward();
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return;
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}
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let line_idx = self.editor.current_field();
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if line_idx == 0 {
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return;
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}
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if let Some((prev_idx, new_col)) = self
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.editor
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.data_provider_mut()
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.join_with_prev(line_idx)
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{
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let _ = self.editor.transition_to_field(prev_idx);
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self.editor.set_cursor_position(new_col);
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self.editor.enter_edit_mode();
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}
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}
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pub fn delete_forward_or_join(&mut self) {
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let line_idx = self.editor.current_field();
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let line_len = self.editor.current_text().chars().count();
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let col = self.editor.cursor_position();
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if col < line_len {
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let _ = self.editor.delete_forward();
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return;
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}
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if let Some(new_col) = self
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.editor
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.data_provider_mut()
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.join_with_next(line_idx)
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{
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self.editor.set_cursor_position(new_col);
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self.editor.enter_edit_mode();
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}
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}
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// Drive the editor from key events
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pub fn input(&mut self, key: KeyEvent) {
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if key.kind != KeyEventKind::Press {
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return;
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}
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match (key.code, key.modifiers) {
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(KeyCode::Enter, _) => self.insert_newline(),
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(KeyCode::Backspace, _) => self.backspace(),
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(KeyCode::Delete, _) => self.delete_forward_or_join(),
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(KeyCode::Left, _) => {
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let _ = self.editor.move_left();
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}
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(KeyCode::Right, _) => {
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let _ = self.editor.move_right();
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}
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(KeyCode::Up, _) => {
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let _ = self.editor.move_up();
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}
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(KeyCode::Down, _) => {
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let _ = self.editor.move_down();
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}
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(KeyCode::Home, _)
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| (KeyCode::Char('a'), KeyModifiers::CONTROL) => {
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self.editor.move_line_start();
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}
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(KeyCode::End, _)
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| (KeyCode::Char('e'), KeyModifiers::CONTROL) => {
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self.editor.move_line_end();
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}
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// Optional: word motions
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(KeyCode::Char('b'), KeyModifiers::ALT) => {
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self.editor.move_word_prev();
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}
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(KeyCode::Char('f'), KeyModifiers::ALT) => {
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self.editor.move_word_next();
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}
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(KeyCode::Char('e'), KeyModifiers::ALT) => {
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self.editor.move_word_end();
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}
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// Insert printable characters
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(KeyCode::Char(c), m) if m.is_empty() => {
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self.editor.enter_edit_mode();
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let _ = self.editor.insert_char(c);
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}
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// Tab: insert 4 spaces (simple default)
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(KeyCode::Tab, _) => {
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self.editor.enter_edit_mode();
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for _ in 0..4 {
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let _ = self.editor.insert_char(' ');
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}
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}
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_ => {}
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}
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}
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// Cursor helpers for GUI
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#[cfg(feature = "gui")]
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pub fn cursor(&self, area: Rect, block: Option<&Block<'_>>) -> (u16, u16) {
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let inner = if let Some(b) = block { b.inner(area) } else { area };
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let line_idx = self.editor.current_field() as u16;
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let y = inner.y + line_idx.saturating_sub(self.scroll_y);
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let current_line = self.editor.current_text();
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let col = self.editor.display_cursor_position();
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let mut x_off: u16 = 0;
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for (i, ch) in current_line.chars().enumerate() {
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if i >= col {
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break;
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}
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x_off = x_off.saturating_add(
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UnicodeWidthChar::width(ch).unwrap_or(0) as u16,
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);
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}
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let x = inner.x.saturating_add(x_off);
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(x, y)
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}
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#[cfg(feature = "gui")]
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pub(crate) fn ensure_visible(
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&mut self,
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area: Rect,
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block: Option<&Block<'_>>,
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) {
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let inner = if let Some(b) = block { b.inner(area) } else { area };
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if inner.height == 0 {
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return;
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}
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let line_idx = self.editor.current_field() as u16;
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if line_idx < self.scroll_y {
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self.scroll_y = line_idx;
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} else if line_idx >= self.scroll_y + inner.height {
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self.scroll_y = line_idx.saturating_sub(inner.height - 1);
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}
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}
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}
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106
canvas/src/textarea/widget.rs
Normal file
106
canvas/src/textarea/widget.rs
Normal file
@@ -0,0 +1,106 @@
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// src/textarea/widget.rs
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#[cfg(feature = "gui")]
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use ratatui::{
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buffer::Buffer,
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layout::{Alignment, Rect},
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style::Style,
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text::{Line, Span},
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widgets::{
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Block, BorderType, Borders, Paragraph, StatefulWidget, Widget, Wrap,
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},
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};
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#[cfg(feature = "gui")]
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use crate::data_provider::DataProvider; // bring trait into scope
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#[cfg(feature = "gui")]
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use crate::textarea::state::TextAreaState;
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#[cfg(feature = "gui")]
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#[derive(Debug, Clone)]
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pub struct TextArea<'a> {
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pub(crate) block: Option<Block<'a>>,
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pub(crate) style: Style,
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pub(crate) border_type: BorderType,
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}
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#[cfg(feature = "gui")]
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impl<'a> Default for TextArea<'a> {
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fn default() -> Self {
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Self {
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block: Some(
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Block::default()
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.borders(Borders::ALL)
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.border_type(BorderType::Rounded),
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),
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style: Style::default(),
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border_type: BorderType::Rounded,
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}
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}
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}
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#[cfg(feature = "gui")]
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impl<'a> TextArea<'a> {
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pub fn block(mut self, block: Block<'a>) -> Self {
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self.block = Some(block);
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self
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}
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pub fn style(mut self, style: Style) -> Self {
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self.style = style;
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self
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}
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pub fn border_type(mut self, ty: BorderType) -> Self {
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self.border_type = ty;
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if let Some(b) = &mut self.block {
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*b = b.clone().border_type(ty);
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}
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self
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}
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}
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#[cfg(feature = "gui")]
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impl<'a> StatefulWidget for TextArea<'a> {
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type State = TextAreaState;
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fn render(self, area: Rect, buf: &mut Buffer, state: &mut Self::State) {
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state.ensure_visible(area, self.block.as_ref());
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let inner = if let Some(b) = &self.block {
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b.clone().render(area, buf);
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b.inner(area)
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} else {
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area
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};
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let total = state.editor.data_provider().line_count();
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let start = state.scroll_y as usize;
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let end = start
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.saturating_add(inner.height as usize)
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.min(total);
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let mut display_lines: Vec<Line> = Vec::with_capacity(end - start);
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if start >= end {
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if let Some(ph) = &state.placeholder {
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display_lines.push(Line::from(Span::raw(ph.clone())));
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}
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} else {
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for i in start..end {
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let s = state.editor.data_provider().field_value(i);
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display_lines.push(Line::from(Span::raw(s.to_string())));
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}
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}
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let mut p = Paragraph::new(display_lines)
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.alignment(Alignment::Left)
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.style(self.style);
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if state.wrap {
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p = p.wrap(Wrap { trim: false });
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}
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p.render(inner, buf);
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}
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}
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