675 lines
21 KiB
Rust
675 lines
21 KiB
Rust
#![forbid(unsafe_code)]
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/*!
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Widget built to show Tree Data structures.
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Tree widget [`Tree`] is generated with [`TreeItem`s](TreeItem) (which itself can contain [`TreeItem`] children to form the tree structure).
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The user interaction state (like the current selection) is stored in the [`TreeState`].
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*/
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use std::collections::HashSet;
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use ratatui::buffer::Buffer;
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use ratatui::layout::{Corner, Rect};
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use ratatui::style::Style;
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use ratatui::text::Text;
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use ratatui::widgets::{Block, StatefulWidget, Widget};
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use unicode_width::UnicodeWidthStr;
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mod flatten;
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mod identifier;
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use crate::flatten::flatten;
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pub use crate::flatten::Flattened;
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pub use crate::identifier::get_without_leaf as get_identifier_without_leaf;
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/// Keeps the state of what is currently selected and what was opened in a [`Tree`].
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///
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/// The generic argument `Identifier` is used to keep the state like the currently selected or opened [`TreeItem`s](TreeItem) in the [`TreeState`].
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/// For more information see [`TreeItem`].
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///
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/// # Example
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///
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/// ```
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/// # use tui_tree_widget::TreeState;
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/// type Identifier = usize;
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///
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/// let mut state = TreeState::<Identifier>::default();
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/// ```
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#[derive(Debug, Default, Clone)]
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pub struct TreeState<Identifier> {
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offset: usize,
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opened: HashSet<Vec<Identifier>>,
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selected: Vec<Identifier>,
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}
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impl<Identifier> TreeState<Identifier>
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where
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Identifier: Clone + PartialEq + Eq + core::hash::Hash,
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{
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#[must_use]
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pub const fn get_offset(&self) -> usize {
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self.offset
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}
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#[must_use]
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pub fn get_all_opened(&self) -> Vec<Vec<Identifier>> {
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self.opened.iter().cloned().collect()
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}
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/// Get a flat list of all visible [`TreeItem`s](TreeItem) with this `TreeState`.
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#[must_use]
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pub fn flatten<'a>(
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&self,
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items: &'a [TreeItem<'a, Identifier>],
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) -> Vec<Flattened<'a, Identifier>> {
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flatten(&self.opened, items)
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}
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#[must_use]
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pub fn selected(&self) -> Vec<Identifier> {
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self.selected.clone()
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}
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pub fn select(&mut self, identifier: Vec<Identifier>) {
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self.selected = identifier;
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// TODO: ListState does this. Is this relevant?
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if self.selected.is_empty() {
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self.offset = 0;
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}
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}
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/// Open a tree node.
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/// Returns `true` if the node was closed and has been opened.
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/// Returns `false` if the node was already open.
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pub fn open(&mut self, identifier: Vec<Identifier>) -> bool {
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if identifier.is_empty() {
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false
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} else {
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self.opened.insert(identifier)
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}
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}
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/// Close a tree node.
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/// Returns `true` if the node was open and has been closed.
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/// Returns `false` if the node was already closed.
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pub fn close(&mut self, identifier: &[Identifier]) -> bool {
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self.opened.remove(identifier)
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}
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/// Toggles a tree node.
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/// If the node is in opened then it calls `close()`. Otherwise it calls `open()`.
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pub fn toggle(&mut self, identifier: Vec<Identifier>) {
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if self.opened.contains(&identifier) {
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self.close(&identifier);
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} else {
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self.open(identifier);
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}
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}
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/// Toggles the currently selected tree node.
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/// See also [`toggle`](TreeState::toggle)
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pub fn toggle_selected(&mut self) {
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self.toggle(self.selected());
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}
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pub fn close_all(&mut self) {
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self.opened.clear();
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}
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/// Select the first node.
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pub fn select_first(&mut self, items: &[TreeItem<Identifier>]) {
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let identifier = items
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.first()
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.map(|o| vec![o.identifier.clone()])
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.unwrap_or_default();
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self.select(identifier);
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}
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/// Select the last visible node.
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pub fn select_last(&mut self, items: &[TreeItem<Identifier>]) {
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let visible = self.flatten(items);
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let new_identifier = visible
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.last()
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.map(|o| o.identifier.clone())
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.unwrap_or_default();
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self.select(new_identifier);
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}
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/// Select the node visible on the given index.
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///
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/// Returns `true` when the selection changed.
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///
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/// This can be useful for mouse clicks.
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pub fn select_visible_index(
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&mut self,
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items: &[TreeItem<Identifier>],
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new_index: usize,
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) -> bool {
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let current_identifier = self.selected();
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let visible = self.flatten(items);
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let new_index = new_index.min(visible.len().saturating_sub(1));
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let new_identifier = visible
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.get(new_index)
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.map(|o| o.identifier.clone())
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.unwrap_or_default();
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let changed = current_identifier != new_identifier;
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self.select(new_identifier);
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changed
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}
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/// Move the current selection with the direction/amount by the given function.
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///
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/// Returns `true` when the selection changed.
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///
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/// # Example
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///
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/// ```
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/// # use tui_tree_widget::TreeState;
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/// # let items = vec![];
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/// # type Identifier = usize;
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/// # let mut state = TreeState::<Identifier>::default();
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/// // Move the selection one down
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/// state.select_visible_relative(&items, |current| {
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/// current.map_or(0, |current| current.saturating_add(1))
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/// });
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/// ```
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///
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/// For more examples take a look into the source code of [`TreeState::key_up`] or [`TreeState::key_down`].
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/// They are implemented with this method.
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pub fn select_visible_relative<F>(&mut self, items: &[TreeItem<Identifier>], f: F) -> bool
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where
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F: FnOnce(Option<usize>) -> usize,
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{
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let visible = self.flatten(items);
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let current_identifier = self.selected();
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let current_index = visible
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.iter()
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.position(|o| o.identifier == current_identifier);
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let new_index = f(current_index).min(visible.len().saturating_sub(1));
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let new_identifier = visible
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.get(new_index)
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.map(|o| o.identifier.clone())
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.unwrap_or_default();
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let changed = current_index != Some(new_index);
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self.select(new_identifier);
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changed
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}
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/// Handles the up arrow key.
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/// Moves up in the current depth or to its parent.
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pub fn key_up(&mut self, items: &[TreeItem<Identifier>]) {
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self.select_visible_relative(items, |current| {
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current.map_or(usize::MAX, |current| current.saturating_sub(1))
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});
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}
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/// Handles the down arrow key.
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/// Moves down in the current depth or into a child node.
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pub fn key_down(&mut self, items: &[TreeItem<Identifier>]) {
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self.select_visible_relative(items, |current| {
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current.map_or(0, |current| current.saturating_add(1))
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});
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}
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/// Handles the left arrow key.
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/// Closes the currently selected or moves to its parent.
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pub fn key_left(&mut self) {
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// Reimplement self.close because of multiple different borrows
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let changed = self.opened.remove(&self.selected);
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if !changed {
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// Select the parent by removing the leaf from selection
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self.selected.pop();
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}
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}
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/// Handles the right arrow key.
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/// Opens the currently selected.
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pub fn key_right(&mut self) {
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self.open(self.selected());
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}
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}
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/// One item inside a [`Tree`].
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///
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/// Can have zero or more `children`.
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///
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/// # Identifier
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///
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/// The generic argument `Identifier` is used to keep the state like the currently selected or opened [`TreeItem`s](TreeItem) in the [`TreeState`].
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///
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/// It needs to be unique among its siblings but can be used again on parent or child [`TreeItem`s](TreeItem).
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/// A common example would be a filename which has to be unique in its directory while it can exist in another.
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///
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/// The `text` can be different from its `identifier`.
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/// To repeat the filename analogy: File browsers sometimes hide file extensions.
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/// The filename `main.rs` is the identifier while its shown as `main`.
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/// Two files `main.rs` and `main.toml` can exist in the same directory and can both be displayed as `main` but their identifier is different.
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///
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/// Just like every file in a file system can be uniquely identified with its file and directory names each [`TreeItem`] in a [`Tree`] can be with these identifiers.
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/// As an example the following two identifiers describe the main file in a Rust cargo project: `vec!["src", "main.rs"]`.
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///
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/// The identifier does not need to be a `String` and is therefore generic.
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/// Until version 0.14 this crate used `usize` and indices.
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/// This might still be perfect for your use case.
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///
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/// # Example
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///
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/// ```
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/// # use tui_tree_widget::TreeItem;
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/// let a = TreeItem::new_leaf("l", "Leaf");
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/// let b = TreeItem::new("r", "Root", vec![a])?;
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/// # Ok::<(), std::io::Error>(())
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/// ```
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#[derive(Debug, Clone)]
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pub struct TreeItem<'a, Identifier> {
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identifier: Identifier,
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text: Text<'a>,
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style: Style,
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children: Vec<TreeItem<'a, Identifier>>,
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}
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impl<'a, Identifier> TreeItem<'a, Identifier>
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where
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Identifier: Clone + PartialEq + Eq + core::hash::Hash,
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{
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/// Create a new `TreeItem` without children.
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#[must_use]
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pub fn new_leaf<T>(identifier: Identifier, text: T) -> Self
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where
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T: Into<Text<'a>>,
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{
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Self {
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identifier,
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text: text.into(),
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style: Style::new(),
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children: Vec::new(),
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}
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}
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/// Create a new `TreeItem` with children.
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///
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/// # Errors
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///
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/// Errors when there are duplicate identifiers in the children.
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pub fn new<T>(
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identifier: Identifier,
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text: T,
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children: Vec<TreeItem<'a, Identifier>>,
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) -> std::io::Result<Self>
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where
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T: Into<Text<'a>>,
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{
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let identifiers = children
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.iter()
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.map(|o| &o.identifier)
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.collect::<HashSet<_>>();
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if identifiers.len() != children.len() {
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return Err(std::io::Error::new(
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std::io::ErrorKind::AlreadyExists,
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"The children contain duplicate identifiers",
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));
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}
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Ok(Self {
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identifier,
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text: text.into(),
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style: Style::new(),
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children,
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})
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}
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#[must_use]
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pub fn children(&self) -> &[TreeItem<Identifier>] {
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&self.children
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}
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/// Get a reference to a child by index.
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#[must_use]
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pub fn child(&self, index: usize) -> Option<&Self> {
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self.children.get(index)
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}
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/// Get a mutable reference to a child by index.
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///
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/// When you choose to change the `identifier` the [`TreeState`] might not work as expected afterwards.
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#[must_use]
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pub fn child_mut(&mut self, index: usize) -> Option<&mut Self> {
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self.children.get_mut(index)
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}
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#[must_use]
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pub fn height(&self) -> usize {
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self.text.height()
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}
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#[must_use]
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pub const 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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/// Add a child to the `TreeItem`.
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///
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/// # Errors
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///
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/// Errors when the `identifier` of the `child` already exists in the children.
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pub fn add_child(&mut self, child: TreeItem<'a, Identifier>) -> std::io::Result<()> {
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let existing = self
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.children
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.iter()
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.map(|o| &o.identifier)
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.collect::<HashSet<_>>();
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if existing.contains(&child.identifier) {
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return Err(std::io::Error::new(
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std::io::ErrorKind::AlreadyExists,
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"identifier already exists in the children",
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));
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}
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self.children.push(child);
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Ok(())
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}
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}
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#[test]
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#[should_panic = "duplicate identifiers"]
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fn tree_item_new_errors_with_duplicate_identifiers() {
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let a = TreeItem::new_leaf("same", "text");
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let b = a.clone();
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TreeItem::new("root", "Root", vec![a, b]).unwrap();
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}
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#[test]
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#[should_panic = "identifier already exists"]
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fn tree_item_add_child_errors_with_duplicate_identifiers() {
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let a = TreeItem::new_leaf("same", "text");
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let b = a.clone();
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let mut root = TreeItem::new("root", "Root", vec![a]).unwrap();
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root.add_child(b).unwrap();
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}
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/// A `Tree` which can be rendered.
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///
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/// The generic argument `Identifier` is used to keep the state like the currently selected or opened [`TreeItem`s](TreeItem) in the [`TreeState`].
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/// For more information see [`TreeItem`].
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///
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/// # Example
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///
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/// ```
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/// # use tui_tree_widget::{Tree, TreeItem, TreeState};
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/// # use ratatui::backend::TestBackend;
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/// # use ratatui::Terminal;
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/// # use ratatui::widgets::{Block, Borders};
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/// # let mut terminal = Terminal::new(TestBackend::new(32, 32)).unwrap();
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/// let mut state = TreeState::default();
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///
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/// let item = TreeItem::new_leaf("l", "leaf");
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/// let items = vec![item];
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///
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/// terminal.draw(|f| {
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/// let area = f.size();
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///
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/// let tree_widget = Tree::new(items)
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/// .expect("all item identifiers are unique")
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/// .block(Block::new().borders(Borders::ALL).title("Tree Widget"));
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///
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/// f.render_stateful_widget(tree_widget, area, &mut state);
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/// })?;
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/// # Ok::<(), std::io::Error>(())
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/// ```
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#[derive(Debug, Clone)]
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pub struct Tree<'a, Identifier> {
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items: Vec<TreeItem<'a, Identifier>>,
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block: Option<Block<'a>>,
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start_corner: Corner,
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/// Style used as a base style for the widget
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style: Style,
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/// Style used to render selected item
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highlight_style: Style,
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/// Symbol in front of the selected item (Shift all items to the right)
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highlight_symbol: &'a str,
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/// Symbol displayed in front of a closed node (As in the children are currently not visible)
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node_closed_symbol: &'a str,
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/// Symbol displayed in front of an open node. (As in the children are currently visible)
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node_open_symbol: &'a str,
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/// Symbol displayed in front of a node without children.
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node_no_children_symbol: &'a str,
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}
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impl<'a, Identifier> Tree<'a, Identifier>
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where
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Identifier: Clone + PartialEq + Eq + core::hash::Hash,
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{
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/// Create a new `Tree`.
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///
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/// # Errors
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///
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/// Errors when there are duplicate identifiers in the children.
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pub fn new(items: Vec<TreeItem<'a, Identifier>>) -> std::io::Result<Self> {
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let identifiers = items.iter().map(|o| &o.identifier).collect::<HashSet<_>>();
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if identifiers.len() != items.len() {
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return Err(std::io::Error::new(
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std::io::ErrorKind::AlreadyExists,
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"The items contain duplicate identifiers",
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));
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}
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Ok(Self {
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items,
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block: None,
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start_corner: Corner::TopLeft,
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style: Style::new(),
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highlight_style: Style::new(),
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highlight_symbol: "",
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node_closed_symbol: "\u{25b6} ", // Arrow to right
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node_open_symbol: "\u{25bc} ", // Arrow down
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node_no_children_symbol: " ",
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})
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}
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#[allow(clippy::missing_const_for_fn)]
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#[must_use]
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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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#[must_use]
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pub const fn start_corner(mut self, corner: Corner) -> Self {
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self.start_corner = corner;
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self
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}
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#[must_use]
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pub const 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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#[must_use]
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pub const fn highlight_style(mut self, style: Style) -> Self {
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self.highlight_style = style;
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self
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}
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#[must_use]
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pub const fn highlight_symbol(mut self, highlight_symbol: &'a str) -> Self {
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self.highlight_symbol = highlight_symbol;
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self
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}
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#[must_use]
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pub const fn node_closed_symbol(mut self, symbol: &'a str) -> Self {
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self.node_closed_symbol = symbol;
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self
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}
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#[must_use]
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pub const fn node_open_symbol(mut self, symbol: &'a str) -> Self {
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self.node_open_symbol = symbol;
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self
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}
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#[must_use]
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pub const fn node_no_children_symbol(mut self, symbol: &'a str) -> Self {
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self.node_no_children_symbol = symbol;
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self
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}
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}
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#[test]
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#[should_panic = "duplicate identifiers"]
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fn tree_new_errors_with_duplicate_identifiers() {
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let a = TreeItem::new_leaf("same", "text");
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let b = a.clone();
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Tree::new(vec![a, b]).unwrap();
|
|
}
|
|
|
|
impl<'a, Identifier> StatefulWidget for Tree<'a, Identifier>
|
|
where
|
|
Identifier: Clone + PartialEq + Eq + core::hash::Hash,
|
|
{
|
|
type State = TreeState<Identifier>;
|
|
|
|
#[allow(clippy::too_many_lines)]
|
|
fn render(self, area: Rect, buf: &mut Buffer, state: &mut Self::State) {
|
|
buf.set_style(area, self.style);
|
|
|
|
// Get the inner area inside a possible block, otherwise use the full area
|
|
let area = self.block.map_or(area, |b| {
|
|
let inner_area = b.inner(area);
|
|
b.render(area, buf);
|
|
inner_area
|
|
});
|
|
|
|
if area.width < 1 || area.height < 1 {
|
|
return;
|
|
}
|
|
|
|
let visible = state.flatten(&self.items);
|
|
if visible.is_empty() {
|
|
return;
|
|
}
|
|
let available_height = area.height as usize;
|
|
|
|
let selected_index = if state.selected.is_empty() {
|
|
0
|
|
} else {
|
|
visible
|
|
.iter()
|
|
.position(|o| o.identifier == state.selected)
|
|
.unwrap_or(0)
|
|
};
|
|
|
|
let mut start = state.offset.min(selected_index);
|
|
let mut end = start;
|
|
let mut height = 0;
|
|
for item in visible.iter().skip(start) {
|
|
if height + item.item.height() > available_height {
|
|
break;
|
|
}
|
|
|
|
height += item.item.height();
|
|
end += 1;
|
|
}
|
|
|
|
while selected_index >= end {
|
|
height = height.saturating_add(visible[end].item.height());
|
|
end += 1;
|
|
while height > available_height {
|
|
height = height.saturating_sub(visible[start].item.height());
|
|
start += 1;
|
|
}
|
|
}
|
|
|
|
state.offset = start;
|
|
|
|
let blank_symbol = " ".repeat(self.highlight_symbol.width());
|
|
|
|
let mut current_height = 0;
|
|
let has_selection = !state.selected.is_empty();
|
|
#[allow(clippy::cast_possible_truncation)]
|
|
for item in visible.iter().skip(state.offset).take(end - start) {
|
|
#[allow(clippy::single_match_else)] // Keep same as List impl
|
|
let (x, y) = match self.start_corner {
|
|
Corner::BottomLeft => {
|
|
current_height += item.item.height() as u16;
|
|
(area.left(), area.bottom() - current_height)
|
|
}
|
|
_ => {
|
|
let pos = (area.left(), area.top() + current_height);
|
|
current_height += item.item.height() as u16;
|
|
pos
|
|
}
|
|
};
|
|
let area = Rect {
|
|
x,
|
|
y,
|
|
width: area.width,
|
|
height: item.item.height() as u16,
|
|
};
|
|
|
|
let item_style = self.style.patch(item.item.style);
|
|
buf.set_style(area, item_style);
|
|
|
|
let is_selected = state.selected == item.identifier;
|
|
let after_highlight_symbol_x = if has_selection {
|
|
let symbol = if is_selected {
|
|
self.highlight_symbol
|
|
} else {
|
|
&blank_symbol
|
|
};
|
|
let (x, _) = buf.set_stringn(x, y, symbol, area.width as usize, item_style);
|
|
x
|
|
} else {
|
|
x
|
|
};
|
|
|
|
let after_depth_x = {
|
|
let indent_width = item.depth() * 2;
|
|
let (after_indent_x, _) = buf.set_stringn(
|
|
after_highlight_symbol_x,
|
|
y,
|
|
" ".repeat(indent_width),
|
|
indent_width,
|
|
item_style,
|
|
);
|
|
let symbol = if item.item.children.is_empty() {
|
|
self.node_no_children_symbol
|
|
} else if state.opened.contains(&item.identifier) {
|
|
self.node_open_symbol
|
|
} else {
|
|
self.node_closed_symbol
|
|
};
|
|
let max_width = area.width.saturating_sub(after_indent_x - x);
|
|
let (x, _) =
|
|
buf.set_stringn(after_indent_x, y, symbol, max_width as usize, item_style);
|
|
x
|
|
};
|
|
|
|
let max_element_width = area.width.saturating_sub(after_depth_x - x);
|
|
for (j, line) in item.item.text.lines.iter().enumerate() {
|
|
buf.set_line(after_depth_x, y + j as u16, line, max_element_width);
|
|
}
|
|
if is_selected {
|
|
buf.set_style(area, self.highlight_style);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a, Identifier> Widget for Tree<'a, Identifier>
|
|
where
|
|
Identifier: Clone + Default + Eq + core::hash::Hash,
|
|
{
|
|
fn render(self, area: Rect, buf: &mut Buffer) {
|
|
let mut state = TreeState::default();
|
|
StatefulWidget::render(self, area, buf, &mut state);
|
|
}
|
|
}
|