416 lines
15 KiB
Rust
416 lines
15 KiB
Rust
use crate::editable_text::{
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TextBoundary, UnicodeTextStorage,
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notify::{TextChanged, TextHistoryPushed},
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};
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use gpui::{
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App, AppContext, ClipboardItem, FocusHandle, Focusable, NavigationDirection, Pixels, Point,
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UTF16Selection, Window,
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};
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use std::ops::Range;
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pub trait TextStateNotifier {
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fn notify_changed(&mut self);
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fn emit_text_changed(&mut self, event: TextChanged);
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fn emit_history(&mut self, event: TextHistoryPushed);
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}
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pub struct TextInputStateBase {
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storage: Box<dyn UnicodeTextStorage>,
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/// The utf-8 character range that is currently selected by the user.
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/// Valid both when start < end and start > end (which dictates the direction of the selection). Empty when start==end.
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/// The start of this range is always the current position of the caret (input cursor).
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///
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/// NOTE: because each input has its own selection state, its trivial for users to have multiple selections active across multiple inputs at the same time.
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/// This could be considered undesirable behavior, and could prompt the question of whether there should be a mechanism to clear selection when focus is lost.
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selected_range: Range<usize>,
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/// The utf-8 character range of `storage` which is being composed by IME
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marked_range: Option<Range<usize>>,
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/// True while the user is in the act of highlighting a section of the text (e.g. during mouse pressed & dragging).
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is_selecting: bool,
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/// The last ui location relative to the element that the user clicked. Used to filter when a user clicks multiple times in the same area.
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last_click_position: Option<Point<Pixels>>,
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/// The number of times the user has clicked `last_click_position`. Used to determine which click behavior to trigger, depending on single, double, or triple clicks.
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click_count: usize,
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focus_handle: FocusHandle,
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}
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impl Focusable for TextInputStateBase {
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fn focus_handle(&self, _: &App) -> FocusHandle {
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self.focus_handle.clone()
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}
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}
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impl TextInputStateBase {
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/// Creates a new `Input` with the specified multiline setting.
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/// Cursor blinking is enabled by default.
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pub fn new(storage: impl Into<Box<dyn UnicodeTextStorage>>, cx: &mut App) -> Self {
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Self {
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storage: storage.into(),
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selected_range: 0..0,
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marked_range: None,
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is_selecting: false,
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last_click_position: None,
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click_count: 0,
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focus_handle: cx.focus_handle(),
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}
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}
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pub fn storage(&self) -> &Box<dyn UnicodeTextStorage> {
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&self.storage
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}
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/// Returns the utf-8 character range that is currently selected within the current state of the text.
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/// Internally converts the stored direction-aware range into a canonical range.
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pub fn selected_range(&self) -> Range<usize> {
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self.selected_range.start.min(self.selected_range.end)
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..self.selected_range.start.max(self.selected_range.end)
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}
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pub fn selection_direction(&self) -> Option<NavigationDirection> {
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match self.selected_range.start.cmp(&self.selected_range.end) {
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std::cmp::Ordering::Less => Some(NavigationDirection::Forward),
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std::cmp::Ordering::Equal => None,
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std::cmp::Ordering::Greater => Some(NavigationDirection::Back),
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}
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}
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pub fn caret_pos(&self) -> usize {
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self.selected_range.start
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}
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pub fn set_selected_range(&mut self, range: Range<usize>) {
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self.selected_range = range;
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}
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}
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impl TextInputStateBase {
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pub fn ime_text_for_range(
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&self,
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range_utf16: Range<usize>,
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adjusted_range: &mut Option<Range<usize>>,
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) -> Option<String> {
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let range = self.storage.utf_range_16to8(&range_utf16);
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let storage_len_utf8 = self.storage.content_utf8().len();
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let clamped_range = range.start.min(storage_len_utf8)..range.end.min(storage_len_utf8);
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adjusted_range.replace(self.storage.utf_range_8to16(&clamped_range));
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Some(self.storage.content_utf8()[clamped_range].to_string())
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}
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pub fn ime_selected_text_range(&self, _ignore_disabled_input: bool) -> Option<UTF16Selection> {
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let selection_range = self.selected_range();
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let direction = self.selection_direction();
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Some(UTF16Selection {
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range: self.storage.utf_range_8to16(&selection_range),
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reversed: direction == Some(NavigationDirection::Back),
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})
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}
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pub fn ime_marked_text_range(&self) -> Option<Range<usize>> {
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self.marked_range
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.as_ref()
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.map(|range| self.storage.utf_range_8to16(range))
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}
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pub fn ime_unmark_text(&mut self) {
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self.marked_range = None;
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}
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pub fn ime_resolve_range(&self, range_utf16: Option<Range<usize>>) -> Range<usize> {
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// Use a series of fallbacks to pick the range to operate on.
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// Fallback order: IME provided range, active IME marked range, selection
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let range = range_utf16.map(|range_utf16| self.storage.utf_range_16to8(&range_utf16));
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let range = range.or_else(|| self.marked_range.clone());
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let range = range.unwrap_or_else(|| self.selected_range());
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let storage_len_utf8 = self.storage().content_utf8().len();
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range.start.min(storage_len_utf8)..range.end.min(storage_len_utf8)
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}
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pub fn replace_text(&mut self, range: &Range<usize>, new_text: &str) {
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let storage_len_utf8 = self.storage.content_utf8().len();
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let start = range.start.min(storage_len_utf8);
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let end = range.end.max(start).min(storage_len_utf8);
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self.storage.replace_range(start..end, new_text);
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let new_caret = start + new_text.len();
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self.selected_range = new_caret..new_caret;
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}
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fn emit_change_for_undo(
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&self,
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cx: &mut impl TextStateNotifier,
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range: Range<usize>,
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length: usize,
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) {
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cx.emit_history(TextHistoryPushed::new(
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range.clone(),
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length,
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&*self.storage,
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self.selected_range.clone(),
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));
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}
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pub fn replace_text_in_range_bytes(
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&mut self,
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range: Range<usize>,
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mut text_to_insert: &str,
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cx: &mut impl TextStateNotifier,
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) {
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// TODO: Apply text sanitization
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// single-line fields should prune \n and \r
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// fields should be able to provide a max_length or other validations on text-input
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let max_length = None::<usize>;
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// Decide the effective new text up front (honouring `max_length`).
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// This avoids the "apply, then truncate" path which would leave the caret past the end.
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if let Some(cap) = max_length {
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let existing_len = self.storage().content_utf8().len() - (range.end - range.start);
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let room = cap.saturating_sub(existing_len);
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text_to_insert = &text_to_insert[..text_to_insert.len().min(room)];
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}
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self.emit_change_for_undo(cx, range.clone(), text_to_insert.len());
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self.storage.replace_range(range, text_to_insert);
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self.marked_range = None;
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}
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pub fn ime_mark_text_in_range(&mut self, range: &Range<usize>, text_len: usize) {
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self.marked_range = match text_len {
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0 => None,
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_ => Some(range.start..range.start + text_len),
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};
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}
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pub fn ime_mark_selected_range(
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&mut self,
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range_overwritten: &Range<usize>,
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new_selected_range_utf16: &Option<Range<usize>>,
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text_len: usize,
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) {
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// NOTE: Differs from yororen-ui
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// https://github.com/MeowLynxSea/yororen-ui/blob/346502ac654b77fdaff3be2d7444fca8783acfc9/crates/yororen-ui-core/src/headless/text_input_core.rs#L359-L371
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self.selected_range = {
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let new_range = new_selected_range_utf16.as_ref();
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let new_range = new_range.map(|range_utf16| self.storage.utf_range_16to8(range_utf16));
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let new_range = new_range.map(|new_range| {
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new_range.start + range_overwritten.start..new_range.end + range_overwritten.start
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});
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new_range.unwrap_or_else(|| {
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range_overwritten.start + text_len..range_overwritten.start + text_len
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})
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};
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}
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}
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impl TextInputStateBase {
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fn move_to(&mut self, caret_pos: usize) {
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//cx.emit(CursorTrigger::PauseBlinkingForUserAction);
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let caret_pos = caret_pos.min(self.storage.content_utf8().len());
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self.selected_range = caret_pos..caret_pos;
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//self.scroll_to_cursor();
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//cx.notify_changed();
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}
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fn select_to(&mut self, caret_pos: usize) {
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//cx.emit(CursorTrigger::PauseBlinkingForUserAction);
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let caret_pos = caret_pos.min(self.storage().content_utf8().len());
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self.selected_range = caret_pos..self.selected_range.start;
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//self.scroll_to_cursor();
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//cx.notify_changed();
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}
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pub fn delete(
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&mut self,
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direction: NavigationDirection,
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boundary: TextBoundary,
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cx: &mut impl TextStateNotifier,
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) {
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let range = self.selected_range();
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let range = match range.is_empty() {
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false => range,
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true => self
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.storage
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.range_from_caret(self.caret_pos(), direction, boundary),
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};
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self.emit_change_for_undo(cx, range.clone(), 0);
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self.replace_text(&range, "");
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self.marked_range = None;
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cx.emit_text_changed(TextChanged);
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cx.notify_changed();
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}
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pub fn nav_linear(
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&mut self,
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direction: NavigationDirection,
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boundary: TextBoundary,
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_cx: &mut impl TextStateNotifier,
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) {
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let caret_pos = match self.selected_range.is_empty() {
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false => match direction {
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NavigationDirection::Back => self.selected_range.start,
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NavigationDirection::Forward => self.selected_range.end,
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},
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true => self
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.storage
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.offset_from_caret(self.caret_pos(), direction, boundary),
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};
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self.move_to(caret_pos);
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}
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pub fn select_all(&mut self, _cx: &mut impl TextStateNotifier) {
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self.selected_range = 0..self.storage.content_utf8().len();
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}
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pub fn select_linear(
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&mut self,
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direction: NavigationDirection,
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boundary: TextBoundary,
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_cx: &mut impl TextStateNotifier,
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) {
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let caret_pos = self
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.storage
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.offset_from_caret(self.caret_pos(), direction, boundary);
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self.select_to(caret_pos);
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}
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pub fn cut<T>(&mut self, cx: &mut T)
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where
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T: TextStateNotifier + std::ops::Deref<Target = App>,
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{
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if !self.selected_range.is_empty() {
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// Cut selected text
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let slice = &self.storage.content_utf8()[self.selected_range.clone()];
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cx.write_to_clipboard(ClipboardItem::new_string(slice.to_string()));
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self.replace_text_in_range_bytes(self.selected_range.clone(), "", cx);
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} else {
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// No selection: cut the entire current line (including newline)
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let caret = self.caret_pos();
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let line_start = self.storage.find_line_start(caret);
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let line_end = self.storage.find_line_end(caret);
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let storage_len_utf8 = self.storage.content_utf8().len();
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// Include the newline character if there is one after the line
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let cut_end = if line_end < storage_len_utf8 {
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line_end + 1 // Include the newline
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} else if line_start > 0 {
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// Last line with no trailing newline - include preceding newline instead
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line_end
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} else {
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line_end
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};
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// For last line, also remove the preceding newline if it exists
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let cut_start = if line_end >= storage_len_utf8 && line_start > 0 {
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line_start - 1 // Include preceding newline for last line
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} else {
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line_start
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};
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self.selected_range = cut_start..cut_end;
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let slice = &self.storage.content_utf8()[self.selected_range.clone()];
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cx.write_to_clipboard(ClipboardItem::new_string(slice.to_string()));
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self.replace_text_in_range_bytes(self.selected_range.clone(), "", cx);
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}
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cx.emit_text_changed(TextChanged);
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cx.notify_changed();
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}
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pub fn copy(&mut self, app: &mut App) {
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if !self.selected_range.is_empty() {
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let slice = &self.storage.content_utf8()[self.selected_range.clone()];
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app.write_to_clipboard(ClipboardItem::new_string(slice.to_string()));
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}
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}
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pub fn paste<T>(&mut self, cx: &mut T)
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where
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T: TextStateNotifier + std::ops::Deref<Target = App>,
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{
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let Some(text) = cx.read_from_clipboard().and_then(|item| item.text()) else {
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return;
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};
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self.replace_text_in_range_bytes(self.ime_resolve_range(None), &text, cx);
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cx.emit_text_changed(TextChanged);
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cx.notify_changed();
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}
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pub fn on_mouse_down<Context>(
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&mut self,
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position: Point<Pixels>,
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character_pos: usize,
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click_count: usize,
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shift: bool,
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window: &mut Window,
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cx: &mut Context,
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) where
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Context: TextStateNotifier + std::ops::DerefMut<Target = App>,
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{
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window.focus(&self.focus_handle, cx);
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self.is_selecting = true;
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let is_same_position = self
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.last_click_position
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.map(|last| {
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let threshold = gpui::px(4.);
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(position.x - last.x).abs() < threshold && (position.y - last.y).abs() < threshold
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})
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.unwrap_or(false);
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if is_same_position && click_count > 1 {
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self.click_count = click_count;
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} else {
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self.click_count = 1;
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}
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self.last_click_position = Some(position);
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match self.click_count {
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2 => {
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let (word_start, word_end) = self.storage.word_range_at(character_pos);
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self.selected_range = word_start..word_end;
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//cx.notify();
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}
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3 => {
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let line_start = self.storage.find_line_start(character_pos);
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let line_end = self.storage.find_line_end(character_pos);
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let line_end_with_newline = if line_end < self.storage.content_utf8().len() {
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line_end + 1
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} else {
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line_end
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};
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self.selected_range = line_start..line_end_with_newline;
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//cx.notify();
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}
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_ => {
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if shift {
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self.select_to(character_pos);
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} else {
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self.move_to(character_pos);
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}
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}
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}
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}
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pub fn on_mouse_up(&mut self) {
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self.is_selecting = false;
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}
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pub fn on_mouse_move(&mut self, character_pos: usize, _cx: &mut impl TextStateNotifier) {
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if self.is_selecting && self.click_count == 1 {
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self.select_to(character_pos);
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}
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}
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}
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