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Correct unicode handling for text input

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Charles Vandevoorde 2017-03-05 10:21:47 +01:00 • committed by charlesvdv
parent 78210c3c94
commit 26e6c09776
5 changed files with 17 additions and 7 deletions
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19
components/script/textinput.rs
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@ -14,6 +14,7 @@ use std::cmp::{max, min};
use std::default::Default;
use std::ops::Range;
use std::usize;
use unicode_segmentation::UnicodeSegmentation;
#[derive(Copy, Clone, PartialEq)]
pub enum Selection {
@ -376,18 +377,16 @@ impl<T: ClipboardProvider> TextInput<T> {
}
let adjust = {
let current_line = &self.lines[self.edit_point.line];
// FIXME: We adjust by one code point, but it proably should be one grapheme cluster
// https://github.com/unicode-rs/unicode-segmentation
match direction {
Direction::Forward => {
match current_line[self.edit_point.index..].chars().next() {
Some(c) => c.len_utf8() as isize,
match current_line[self.edit_point.index..].graphemes(true).next() {
Some(c) => c.len() as isize,
None => 1, // Going to the next line is a "one byte" offset
}
}
Direction::Backward => {
match current_line[..self.edit_point.index].chars().next_back() {
Some(c) => -(c.len_utf8() as isize),
match current_line[..self.edit_point.index].graphemes(true).next_back() {
Some(c) => -(c.len() as isize),
None => -1, // Going to the previous line is a "one byte" offset
}
}
@ -677,4 +676,12 @@ impl<T: ClipboardProvider> TextInput<T> {
selection_start as u32
}
pub fn set_edit_point_index(&mut self, index: usize) {
let byte_size = self.lines[self.edit_point.line]
.graphemes(true)
.take(index)
.fold(0, |acc, x| acc + x.len());
self.edit_point.index = byte_size;
}
}