add input
This commit is contained in:
@@ -0,0 +1,753 @@
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use std::cell::RefCell;
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use std::ops::Range;
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use std::rc::Rc;
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use unicode_segmentation::UnicodeSegmentation;
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use gpui::prelude::FluentBuilder as _;
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use gpui::{
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App, AppContext as _, Bounds, ClipboardItem, Context, DispatchPhase, ElementId, Entity,
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EntityInputHandler, Font, InteractiveElement as _, IntoElement, KeyDownEvent, MouseButton,
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MouseDownEvent, MouseMoveEvent, MouseUpEvent, ParentElement as _, Pixels, RenderOnce, Role,
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SharedString, StatefulInteractiveElement as _, Styled as _, TextAlign, TextRun, UTF16Selection,
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Window, canvas, div, fill, point, px,
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};
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use gpui_native_theme::ActiveTheme as _;
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use crate::common::h_flex;
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/// Input layout information for hit testing and caret positioning.
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struct InputLayout {
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line: gpui::ShapedLine,
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bounds: Bounds<Pixels>,
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/// Where the text was painted inside `bounds` (padding minus scroll).
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origin: gpui::Point<Pixels>,
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}
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/// Input state for a single-line text field.
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pub struct InputState {
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text: String,
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/// The caret's byte offset.
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cursor: usize,
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/// The byte offset the selection extends from.
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anchor: usize,
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/// The byte range of in-progress IME composition, if any.
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marked_range: Option<Range<usize>>,
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focus_handle: gpui::FocusHandle,
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layout: Rc<RefCell<Option<InputLayout>>>,
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}
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impl InputState {
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fn new_inner(cx: &mut App) -> Self {
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Self {
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text: String::new(),
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cursor: 0,
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anchor: 0,
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marked_range: None,
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focus_handle: cx.focus_handle(),
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layout: Rc::new(RefCell::new(None)),
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}
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}
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/// Creates the state entity for an application-owned input.
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pub fn new(cx: &mut App) -> Entity<Self> {
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cx.new(|cx| Self::new_inner(cx))
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}
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/// Creates the state entity with initial text, caret at the end.
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pub fn new_with_text(text: impl Into<String>, cx: &mut App) -> Entity<Self> {
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let text = text.into();
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cx.new(|cx| {
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let mut state = Self::new_inner(cx);
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state.text = text;
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state.cursor = state.text.len();
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state.anchor = state.cursor;
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state
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})
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}
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/// The current text.
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pub fn value(&self) -> &str {
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&self.text
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}
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/// Replaces the whole value and collapses the selection to the end.
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pub fn set_value<V>(&mut self, value: V, window: &mut Window, cx: &mut Context<Self>)
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where
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V: Into<String>,
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{
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self.text = value.into();
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self.cursor = self.text.len();
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self.anchor = self.cursor;
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self.marked_range = None;
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self.notify(window, cx);
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}
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/// The focus handle, for applications that focus the field programmatically.
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pub fn focus_handle(&self) -> gpui::FocusHandle {
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self.focus_handle.clone()
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}
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/// The selected byte range of the buffer.
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fn selection(&self) -> Range<usize> {
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self.cursor.min(self.anchor)..self.cursor.max(self.anchor)
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}
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fn notify(&mut self, window: &mut Window, cx: &mut Context<Self>) {
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cx.notify();
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window.notify_text_input_changed(&self.focus_handle);
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}
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/// Replaces a byte range with `text` and collapses the caret to its end.
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fn replace_range(
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&mut self,
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range: Range<usize>,
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text: &str,
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window: &mut Window,
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cx: &mut Context<Self>,
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) {
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self.text.replace_range(range.clone(), text);
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self.cursor = range.start + text.len();
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self.anchor = self.cursor;
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self.marked_range = None;
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self.notify(window, cx);
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}
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/// Deletes the selection, or one character/word before the caret.
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fn delete_backward(&mut self, word: bool, window: &mut Window, cx: &mut Context<Self>) {
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if !self.selection().is_empty() {
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let range = self.selection();
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self.replace_range(range, "", window, cx);
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} else if self.cursor > 0 {
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let start = if word {
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previous_word_start(&self.text, self.cursor)
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} else {
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previous_grapheme_start(&self.text, self.cursor)
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};
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self.replace_range(start..self.cursor, "", window, cx);
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}
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}
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/// Deletes the selection, or one character/word after the caret.
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fn delete_forward(&mut self, word: bool, window: &mut Window, cx: &mut Context<Self>) {
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if !self.selection().is_empty() {
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let range = self.selection();
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self.replace_range(range, "", window, cx);
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} else if self.cursor < self.text.len() {
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let end = if word {
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next_word_end(&self.text, self.cursor)
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} else {
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next_grapheme_start(&self.text, self.cursor)
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};
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self.replace_range(self.cursor..end, "", window, cx);
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}
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}
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/// Moves the caret, extending the selection when `extend`.
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fn move_cursor(
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&mut self,
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to: usize,
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extend: bool,
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window: &mut Window,
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cx: &mut Context<Self>,
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) {
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self.cursor = to.clamp(0, self.text.len());
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if !extend {
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self.anchor = self.cursor;
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}
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self.notify(window, cx);
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}
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/// Selects `range`.
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fn select_range(&mut self, range: Range<usize>, window: &mut Window, cx: &mut Context<Self>) {
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self.anchor = range.start;
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self.cursor = range.end;
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self.notify(window, cx);
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}
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/// Copies or cuts the selection to the clipboard.
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fn copy_or_cut(&mut self, cut: bool, window: &mut Window, cx: &mut Context<Self>) {
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let range = self.selection();
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if range.is_empty() {
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return;
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}
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cx.write_to_clipboard(ClipboardItem::new_string(
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self.text[range.clone()].to_string(),
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));
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if cut {
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self.replace_range(range, "", window, cx);
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}
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}
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}
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impl EntityInputHandler for InputState {
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fn text_for_range(
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&mut self,
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range_utf16: Range<usize>,
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adjusted_range: &mut Option<Range<usize>>,
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_window: &mut Window,
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_cx: &mut Context<Self>,
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) -> Option<String> {
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let range = utf16_range_to_utf8(&self.text, range_utf16);
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adjusted_range.replace(utf8_range_to_utf16(&self.text, range.clone()));
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Some(self.text[range].to_string())
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}
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fn selected_text_range(
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&mut self,
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_ignore_disabled_input: bool,
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_window: &mut Window,
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_cx: &mut Context<Self>,
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) -> Option<UTF16Selection> {
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Some(UTF16Selection {
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range: utf8_range_to_utf16(&self.text, self.selection()),
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reversed: self.cursor < self.anchor,
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})
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}
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fn marked_text_range(
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&self,
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_window: &mut Window,
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_cx: &mut Context<Self>,
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) -> Option<Range<usize>> {
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self.marked_range
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.clone()
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.map(|range| utf8_range_to_utf16(&self.text, range))
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}
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fn unmark_text(&mut self, _window: &mut Window, _cx: &mut Context<Self>) {
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self.marked_range = None;
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}
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fn replace_text_in_range(
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&mut self,
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range_utf16: Option<Range<usize>>,
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text: &str,
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window: &mut Window,
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cx: &mut Context<Self>,
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) {
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let range = range_utf16.map_or_else(
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|| self.selection(),
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|range| utf16_range_to_utf8(&self.text, range),
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);
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self.replace_range(range, text, window, cx);
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}
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fn replace_and_mark_text_in_range(
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&mut self,
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range_utf16: Option<Range<usize>>,
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new_text: &str,
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new_selected_range_utf16: Option<Range<usize>>,
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window: &mut Window,
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cx: &mut Context<Self>,
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) {
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let range = range_utf16.map_or_else(
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|| self.selection(),
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|range| utf16_range_to_utf8(&self.text, range),
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);
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self.text.replace_range(range.clone(), new_text);
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let start = range.start;
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let end = start + new_text.len();
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self.marked_range = Some(start..end);
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let selected_end = new_selected_range_utf16
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.map(|selected| utf16_range_to_utf8(&self.text, selected).end)
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.unwrap_or(end);
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self.cursor = selected_end;
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self.anchor = selected_end;
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self.notify(window, cx);
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}
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fn bounds_for_range(
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&mut self,
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range_utf16: Range<usize>,
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_element_bounds: Bounds<Pixels>,
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_window: &mut Window,
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_cx: &mut Context<Self>,
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) -> Option<Bounds<Pixels>> {
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let layout = self.layout.borrow();
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let layout = layout.as_ref()?;
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let start = layout
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.line
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.x_for_index(utf16_to_utf8_offset(&self.text, range_utf16.start));
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let end = layout
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.line
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.x_for_index(utf16_to_utf8_offset(&self.text, range_utf16.end));
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// `origin` is already an absolute window point.
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Some(Bounds::from_corners(
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point(layout.origin.x + start.min(end), layout.bounds.top()),
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point(layout.origin.x + start.max(end), layout.bounds.bottom()),
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))
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}
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fn character_index_for_point(
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&mut self,
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window_point: gpui::Point<Pixels>,
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_window: &mut Window,
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_cx: &mut Context<Self>,
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) -> Option<usize> {
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let layout = self.layout.borrow();
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let layout = layout.as_ref()?;
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Some(
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layout
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.line
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.closest_index_for_x(window_point.x - layout.origin.x)
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.min(self.text.len()),
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)
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}
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fn text_length_utf16(
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&mut self,
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_window: &mut Window,
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_cx: &mut Context<Self>,
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) -> Option<usize> {
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Some(self.text.encode_utf16().count())
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}
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}
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/// Floors `index` to the nearest grapheme-cluster boundary at or below it.
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fn previous_grapheme_start(text: &str, index: usize) -> usize {
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text.grapheme_indices(true)
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.rev()
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.find(|(offset, _)| *offset < index)
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.map(|(offset, _)| offset)
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.unwrap_or(0)
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}
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/// Advances `index` to the next grapheme-cluster boundary.
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fn next_grapheme_start(text: &str, index: usize) -> usize {
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text.grapheme_indices(true)
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.find(|(offset, _)| *offset > index)
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.map(|(offset, _)| offset)
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.unwrap_or(text.len())
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}
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/// The start of the word before `from`.
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fn previous_word_start(text: &str, from: usize) -> usize {
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let mut best = 0;
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for (offset, word) in text.split_word_bound_indices() {
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if offset >= from {
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break;
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}
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if !word.starts_with(char::is_whitespace) {
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best = offset;
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}
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}
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best
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}
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/// The end of the word after `from`.
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fn next_word_end(text: &str, from: usize) -> usize {
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for (offset, word) in text.split_word_bound_indices() {
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let end = offset + word.len();
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if end > from && !word.starts_with(char::is_whitespace) {
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return end;
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}
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}
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text.len()
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}
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/// Converts a UTF-16 offset into a UTF-8 byte offset.
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fn utf16_to_utf8_offset(text: &str, utf16_offset: usize) -> usize {
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let mut utf16_count = 0;
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for (byte_offset, char) in text.char_indices() {
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if utf16_count >= utf16_offset {
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return byte_offset;
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}
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utf16_count += char.len_utf16();
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}
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text.len()
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}
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/// Converts a UTF-8 byte range to a UTF-16 range.
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fn utf8_range_to_utf16(text: &str, range: Range<usize>) -> Range<usize> {
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utf16_to_utf8_offset(text, range.start)..utf16_to_utf8_offset(text, range.end)
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}
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/// Converts a UTF-16 range to a UTF-8 byte range.
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fn utf16_range_to_utf8(text: &str, range: Range<usize>) -> Range<usize> {
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utf16_to_utf8_offset(text, range.start)..utf16_to_utf8_offset(text, range.end)
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}
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/// A single-line text field bound to an application-owned [`InputState`].
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#[derive(IntoElement)]
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pub struct Input {
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id: ElementId,
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state: Entity<InputState>,
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placeholder: SharedString,
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disabled: bool,
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a11y_label: Option<SharedString>,
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}
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impl Input {
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/// Creates a text field bound to `state`.
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pub fn new<I>(id: I, state: Entity<InputState>) -> Self
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where
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I: Into<ElementId>,
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{
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Self {
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id: id.into(),
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state,
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placeholder: SharedString::default(),
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disabled: false,
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a11y_label: None,
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}
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}
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/// Sets the placeholder shown when the field is empty and unfocused.
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pub fn placeholder<P>(mut self, placeholder: P) -> Self
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where
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P: Into<SharedString>,
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{
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self.placeholder = placeholder.into();
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self
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}
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/// Renders the field inert, unfocusable, and dimmed; disabled always wins.
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pub fn disabled(mut self, disabled: bool) -> Self {
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self.disabled = disabled;
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self
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}
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/// Overrides the accessibility label.
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pub fn accessibility_label<L>(mut self, label: L) -> Self
|
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where
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L: Into<SharedString>,
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||||
{
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self.a11y_label = Some(label.into());
|
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self
|
||||
}
|
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}
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impl RenderOnce for Input {
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fn render(self, window: &mut Window, cx: &mut App) -> impl IntoElement {
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let theme = cx.theme();
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let colors = theme.colors;
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let radius = theme.radius;
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let focus_handle = self.state.read(cx).focus_handle.clone();
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let layout_cell = self.state.read(cx).layout.clone();
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|
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// Drag selection crosses frames, so it lives in keyed element state.
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let dragging = window.use_keyed_state("input-dragging", cx, |_, _| false);
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let down_dragging = dragging.clone();
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let paint_dragging = dragging.clone();
|
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let focused = focus_handle.is_focused(window);
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let is_empty = self.state.read(cx).text.is_empty();
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|
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let key_state = self.state.clone();
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let key_focus = focus_handle.clone();
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let down_state = self.state.clone();
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let down_layout = layout_cell.clone();
|
||||
|
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let fallback_label = self
|
||||
.a11y_label
|
||||
.clone()
|
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.or_else(|| (!self.placeholder.is_empty()).then_some(self.placeholder.clone()))
|
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.unwrap_or_else(|| SharedString::from(self.id.to_string()));
|
||||
|
||||
h_flex()
|
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.id(self.id.clone())
|
||||
.relative()
|
||||
.overflow_hidden()
|
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.w_full()
|
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.h_7()
|
||||
.px_2()
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.rounded(radius.control)
|
||||
.border_1()
|
||||
.border_color(colors.border)
|
||||
.bg(colors.input)
|
||||
.text_sm()
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||||
.text_color(colors.foreground)
|
||||
.role(Role::TextInput)
|
||||
.aria_label(fallback_label)
|
||||
.when(self.disabled, |input| input.opacity(0.5))
|
||||
.when(!self.disabled, |input| {
|
||||
input.track_focus(&focus_handle).tab_stop(true)
|
||||
})
|
||||
.when(focused, |input| input.border_color(colors.ring))
|
||||
.when(is_empty && !focused, |input| {
|
||||
input.child(
|
||||
div()
|
||||
.text_color(colors.muted_foreground)
|
||||
.child(self.placeholder.clone()),
|
||||
)
|
||||
})
|
||||
.child(
|
||||
canvas(
|
||||
{
|
||||
let state = self.state.clone();
|
||||
|
||||
move |_bounds, window, cx| {
|
||||
let text = state.read(cx).text.clone();
|
||||
let text_style = window.text_style();
|
||||
let font = Font {
|
||||
family: text_style.font_family.clone(),
|
||||
features: text_style.font_features.clone(),
|
||||
weight: text_style.font_weight,
|
||||
style: text_style.font_style,
|
||||
fallbacks: text_style.font_fallbacks.clone(),
|
||||
};
|
||||
let font_size = text_style.font_size.to_pixels(window.rem_size());
|
||||
let runs = [TextRun {
|
||||
len: text.len(),
|
||||
font,
|
||||
color: text_style.color,
|
||||
background_color: None,
|
||||
underline: None,
|
||||
strikethrough: None,
|
||||
}];
|
||||
window
|
||||
.text_system()
|
||||
.shape_line(text.into(), font_size, &runs, None)
|
||||
}
|
||||
},
|
||||
{
|
||||
let state = self.state.clone();
|
||||
let layout_cell = layout_cell.clone();
|
||||
let focus = focus_handle.clone();
|
||||
let dragging = paint_dragging;
|
||||
let disabled = self.disabled;
|
||||
// `line` comes from the prepaint closure above.
|
||||
move |bounds, line, window, cx| {
|
||||
let (font_size, line_height) = {
|
||||
let text_style = window.text_style();
|
||||
(
|
||||
text_style.font_size.to_pixels(window.rem_size()),
|
||||
text_style
|
||||
.line_height
|
||||
.to_pixels(text_style.font_size, window.rem_size()),
|
||||
)
|
||||
};
|
||||
|
||||
let padding = px(8.);
|
||||
let selection = state.read(cx).selection();
|
||||
let caret_x = line.x_for_index(selection.end);
|
||||
|
||||
// Horizontal scroll keeps the caret inside the field.
|
||||
let visible = bounds.size.width - padding * 2.0;
|
||||
let scroll_x = if caret_x > visible {
|
||||
caret_x - visible
|
||||
} else {
|
||||
Pixels::ZERO
|
||||
};
|
||||
|
||||
let origin = point(
|
||||
bounds.left() + padding - scroll_x,
|
||||
bounds.top() + (bounds.size.height - line_height) / 2.0,
|
||||
);
|
||||
*layout_cell.borrow_mut() = Some(InputLayout {
|
||||
line,
|
||||
bounds,
|
||||
origin,
|
||||
});
|
||||
|
||||
let layout = layout_cell.borrow();
|
||||
let layout = layout.as_ref().expect("layout just stored");
|
||||
let line = &layout.line;
|
||||
let origin = layout.origin;
|
||||
|
||||
if focused && !selection.is_empty() {
|
||||
let start_x = line.x_for_index(selection.start);
|
||||
let rect = Bounds::from_corners(
|
||||
point(origin.x + start_x.min(caret_x), bounds.top() + px(1.)),
|
||||
point(
|
||||
origin.x + start_x.max(caret_x),
|
||||
bounds.bottom() - px(1.),
|
||||
),
|
||||
);
|
||||
window.paint_quad(fill(rect, colors.selection));
|
||||
}
|
||||
|
||||
let _ =
|
||||
line.paint(origin, line_height, TextAlign::Left, None, window, cx);
|
||||
|
||||
if focused && selection.is_empty() {
|
||||
let caret_top = origin.y + (line_height - font_size) / 2.0;
|
||||
let caret = Bounds::from_corners(
|
||||
point(origin.x + caret_x, caret_top),
|
||||
point(origin.x + caret_x + px(1.5), caret_top + font_size),
|
||||
);
|
||||
window.paint_quad(fill(caret, colors.foreground));
|
||||
}
|
||||
|
||||
if disabled {
|
||||
return;
|
||||
}
|
||||
|
||||
window.handle_input(
|
||||
&focus,
|
||||
gpui::ElementInputHandler::new(bounds, state.clone()),
|
||||
cx,
|
||||
);
|
||||
|
||||
if *dragging.read(cx) {
|
||||
window.on_mouse_event({
|
||||
let state = state.clone();
|
||||
let layout_cell = layout_cell.clone();
|
||||
move |event: &MouseMoveEvent, phase, window, cx| {
|
||||
if phase != DispatchPhase::Bubble
|
||||
|| event.pressed_button != Some(MouseButton::Left)
|
||||
{
|
||||
return;
|
||||
}
|
||||
state.update(cx, |state, cx| {
|
||||
let index = index_at_x(
|
||||
&layout_cell,
|
||||
event.position.x,
|
||||
state.text.len(),
|
||||
);
|
||||
state.cursor = index;
|
||||
state.notify(window, cx);
|
||||
});
|
||||
}
|
||||
});
|
||||
}
|
||||
window.on_mouse_event({
|
||||
let dragging = dragging.clone();
|
||||
move |event: &MouseUpEvent, phase, _window, cx| {
|
||||
if phase != DispatchPhase::Bubble
|
||||
|| event.button != MouseButton::Left
|
||||
{
|
||||
return;
|
||||
}
|
||||
dragging.update(cx, |dragging, _| *dragging = false);
|
||||
}
|
||||
});
|
||||
}
|
||||
},
|
||||
)
|
||||
.absolute()
|
||||
.inset_0(),
|
||||
)
|
||||
.when(!self.disabled, |input| {
|
||||
input
|
||||
.on_mouse_down(MouseButton::Left, {
|
||||
let state = down_state;
|
||||
let layout_cell = down_layout;
|
||||
let dragging = down_dragging;
|
||||
move |event: &MouseDownEvent, window, cx| {
|
||||
dragging.update(cx, |dragging, _| *dragging = true);
|
||||
state.update(cx, |state, cx| {
|
||||
let index =
|
||||
index_at_x(&layout_cell, event.position.x, state.text.len());
|
||||
if event.click_count == 2 {
|
||||
let start = previous_word_start(&state.text, index);
|
||||
let end = next_word_end(&state.text, index);
|
||||
state.select_range(start..end, window, cx);
|
||||
} else if event.modifiers.shift {
|
||||
state.cursor = index;
|
||||
state.notify(window, cx);
|
||||
} else {
|
||||
state.cursor = index;
|
||||
state.anchor = index;
|
||||
state.notify(window, cx);
|
||||
}
|
||||
});
|
||||
}
|
||||
})
|
||||
.on_key_down({
|
||||
move |event: &KeyDownEvent, window, cx| {
|
||||
if !key_focus.contains_focused(window, cx) {
|
||||
return;
|
||||
}
|
||||
let keystroke = &event.keystroke;
|
||||
let command =
|
||||
keystroke.modifiers.platform || keystroke.modifiers.control;
|
||||
key_state.update(cx, |state, cx| match keystroke.key.as_str() {
|
||||
"left" => {
|
||||
let to = if command || keystroke.modifiers.alt {
|
||||
previous_word_start(&state.text, state.cursor)
|
||||
} else {
|
||||
previous_grapheme_start(&state.text, state.cursor)
|
||||
};
|
||||
state.move_cursor(to, keystroke.modifiers.shift, window, cx);
|
||||
cx.stop_propagation();
|
||||
}
|
||||
"right" => {
|
||||
let to = if command || keystroke.modifiers.alt {
|
||||
next_word_end(&state.text, state.cursor)
|
||||
} else {
|
||||
next_grapheme_start(&state.text, state.cursor)
|
||||
};
|
||||
state.move_cursor(to, keystroke.modifiers.shift, window, cx);
|
||||
cx.stop_propagation();
|
||||
}
|
||||
"home" => {
|
||||
state.move_cursor(0, keystroke.modifiers.shift, window, cx);
|
||||
cx.stop_propagation();
|
||||
}
|
||||
"end" => {
|
||||
state.move_cursor(
|
||||
state.text.len(),
|
||||
keystroke.modifiers.shift,
|
||||
window,
|
||||
cx,
|
||||
);
|
||||
cx.stop_propagation();
|
||||
}
|
||||
"backspace" => {
|
||||
state.delete_backward(
|
||||
command || keystroke.modifiers.alt,
|
||||
window,
|
||||
cx,
|
||||
);
|
||||
cx.stop_propagation();
|
||||
}
|
||||
"delete" => {
|
||||
state.delete_forward(
|
||||
command || keystroke.modifiers.alt,
|
||||
window,
|
||||
cx,
|
||||
);
|
||||
cx.stop_propagation();
|
||||
}
|
||||
"a" if command => {
|
||||
let len = state.text.len();
|
||||
state.select_range(0..len, window, cx);
|
||||
cx.stop_propagation();
|
||||
}
|
||||
"c" if command => {
|
||||
state.copy_or_cut(false, window, cx);
|
||||
cx.stop_propagation();
|
||||
}
|
||||
"x" if command => {
|
||||
state.copy_or_cut(true, window, cx);
|
||||
cx.stop_propagation();
|
||||
}
|
||||
"v" if command => {
|
||||
if let Some(item) = cx.read_from_clipboard()
|
||||
&& let Some(text) = item.text()
|
||||
{
|
||||
let range = state.selection();
|
||||
state.replace_range(range, &text, window, cx);
|
||||
}
|
||||
cx.stop_propagation();
|
||||
}
|
||||
"enter" | "tab" => {}
|
||||
_ => {
|
||||
if let Some(text) = &keystroke.key_char
|
||||
&& !command
|
||||
{
|
||||
let range = state.selection();
|
||||
state.replace_range(range, text, window, cx);
|
||||
cx.stop_propagation();
|
||||
}
|
||||
}
|
||||
});
|
||||
}
|
||||
})
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
/// The text index at window x, using the last painted layout.
|
||||
fn index_at_x(layout_cell: &RefCell<Option<InputLayout>>, x: Pixels, text_len: usize) -> usize {
|
||||
let layout = layout_cell.borrow();
|
||||
let Some(layout) = layout.as_ref() else {
|
||||
return 0;
|
||||
};
|
||||
layout
|
||||
.line
|
||||
.closest_index_for_x(x - layout.origin.x)
|
||||
.min(text_len)
|
||||
}
|
||||
@@ -28,3 +28,6 @@ pub mod progress;
|
||||
|
||||
#[cfg(feature = "avatar")]
|
||||
pub mod avatar;
|
||||
|
||||
#[cfg(feature = "input")]
|
||||
pub mod input;
|
||||
|
||||
Reference in New Issue
Block a user