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Code Issues Projects Releases Wiki Activity

Better wide char support

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This commit is contained in:
Alexandre Bury 2016-07-04 16:04:32 -07:00
parent cb7a1e37a4
commit cc72aa4ddc
7 changed files with 135 additions and 59 deletions
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4
assets/cities.txt
View File

@ -28,6 +28,7 @@ Bangui
Banjul
Basseterre
Beijing
北京
Beirut
Belgrade
Belmopan
@ -227,6 +228,7 @@ Thimphu
Tirana
Tiraspol
Tokyo
東京
Tórshavn
Tripoli
Tskhinvali
@ -234,7 +236,7 @@ Tunis
Ulaanbaatar
Vaduz
Valletta
Valparaíso­so
Valparaíso
Vatican City
Victoria
Vienna

6
src/menubar.rs
View File

@ -8,6 +8,8 @@ use event::*;
use std::rc::Rc;
use unicode_width::UnicodeWidthStr;
/// Current state of the menubar
#[derive(PartialEq, Debug)]
enum State {
@ -78,7 +80,7 @@ impl Menubar {
(i == self.focus);
printer.with_selection(selected, |printer| {
printer.print((offset, 0), &format!(" {} ", title));
offset += title.len() + 2;
offset += title.width() + 2;
});
}
}
@ -108,7 +110,7 @@ impl Menubar {
self.state = State::Submenu;
let offset = (self.menus[..self.focus]
.iter()
.map(|&(ref title, _)| title.len() + 2)
.map(|&(ref title, _)| title.width() + 2)
.fold(0, |a, b| a + b),
if self.autohide {
1

3
src/view/button.rs
View File

@ -6,6 +6,7 @@ use vec::Vec2;
use view::{View};
use event::*;
use printer::Printer;
use unicode_width::UnicodeWidthStr;
/// Simple text label with a callback when ENTER is pressed.
/// A button shows its content in a single line and has a fixed size.
@ -44,7 +45,7 @@ impl View for Button {
fn get_min_size(&self, _: Vec2) -> Vec2 {
// Meh. Fixed size we are.
Vec2::new(2 + self.label.chars().count(), 1)
Vec2::new(2 + self.label.width(), 1)
}
fn on_event(&mut self, event: Event) -> EventResult {

6
src/view/dialog.rs
View File

@ -10,6 +10,8 @@ use view::{Button, SizedView};
use vec::{ToVec4, Vec2, Vec4};
use printer::Printer;
use unicode_width::UnicodeWidthStr;
#[derive(PartialEq)]
enum Focus {
Content,
@ -147,7 +149,7 @@ impl View for Dialog {
printer.print_box(Vec2::new(0, 0), printer.size);
if !self.title.is_empty() {
let len = self.title.chars().count();
let len = self.title.width();
let x = (printer.size.x - len) / 2;
printer.print((x - 2, 0), "┤ ");
printer.print((x + len, 0), " ├");
@ -181,7 +183,7 @@ impl View for Dialog {
if !self.title.is_empty() {
// If we have a title, we have to fit it too!
inner_size.x = max(inner_size.x, self.title.chars().count() + 6);
inner_size.x = max(inner_size.x, self.title.width() + 6);
}
inner_size

157
src/view/edit_view.rs
View File

@ -1,4 +1,5 @@
use unicode_segmentation::UnicodeSegmentation;
use unicode_width::UnicodeWidthStr;
use std::cmp::min;
@ -8,16 +9,19 @@ use view::{IdView, View};
use event::*;
use printer::Printer;
/// Input box where the user can enter and edit text.
pub struct EditView {
/// Current content
/// Current content.
content: String,
/// Cursor position in the content
/// Cursor position in the content, in bytes.
cursor: usize,
/// Minimum layout length asked to the parent
/// Minimum layout length asked to the parent.
min_length: usize,
/// When the content is too long for the display, offset it
/// Number of bytes to skip at the beginning of the content.
///
/// (When the content is too long for the display, we hide part of it)
offset: usize,
/// Last display length, to know the possible offset range
last_length: usize, /* scrollable: bool,
@ -73,48 +77,62 @@ impl EditView {
}
}
fn remove_char(s: &mut String, cursor: usize) {
let i = match s.char_indices().nth(cursor) {
Some((i, _)) => i,
None => return,
};
s.remove(i);
}
impl View for EditView {
fn draw(&mut self, printer: &Printer) {
// let style = if focused { color::HIGHLIGHT } else { color::HIGHLIGHT_INACTIVE };
let len = self.content.chars().count();
assert!(printer.size.x == self.last_length);
let width = self.content.width();
printer.with_color(ColorStyle::Secondary, |printer| {
printer.with_effect(Effect::Reverse, |printer| {
if len < self.last_length {
if width < self.last_length {
// No problem, everything fits.
printer.print((0, 0), &self.content);
printer.print_hline((len, 0), printer.size.x - len, "_");
printer.print_hline((width, 0),
printer.size.x - width,
"_");
} else {
let visible_end = min(self.content.len(), self.offset + self.last_length);
let content = &self.content[self.offset..];
let display_bytes = content.graphemes(true)
.scan(0, |w, g| {
*w += g.width();
if *w > self.last_length {
None
} else {
Some(g)
}
})
.map(|g| g.len())
.fold(0, |a, b| a + b);
let content = &content[..display_bytes];
let content = &self.content[self.offset..visible_end];
printer.print((0, 0), content);
if visible_end - self.offset < printer.size.x {
printer.print((printer.size.x - 1, 0), "_");
let width = content.width();
if width < self.last_length {
printer.print_hline((width, 0),
self.last_length - width,
"_");
}
}
});
// Now print cursor
if printer.focused {
let c = if self.cursor == len {
let c = if self.cursor == self.content.len() {
"_"
} else {
// Get the char from the string... Is it so hard?
self.content
self.content[self.cursor..]
.graphemes(true)
.nth(self.cursor)
.next()
.expect(&format!("Found no char at cursor {} in {}",
self.cursor,
self.content))
};
printer.print_hline((self.cursor - self.offset, 0), 1, c);
let offset = self.content[self.offset..self.cursor].width();
printer.print((offset, 0), c);
}
});
}
@ -137,25 +155,41 @@ impl View for EditView {
Event::Char(ch) => {
// Find the byte index of the char at self.cursor
match self.content.char_indices().nth(self.cursor) {
None => self.content.push(ch),
Some((i, _)) => self.content.insert(i, ch),
}
self.content.insert(self.cursor, ch);
// TODO: handle wide (CJK) chars
self.cursor += 1;
self.cursor += ch.len_utf8();
}
Event::Key(key) => {
match key {
Key::Home => self.cursor = 0,
Key::End => self.cursor = self.content.chars().count(),
Key::Left if self.cursor > 0 => self.cursor -= 1,
Key::Right if self.cursor < self.content.chars().count() => self.cursor += 1,
Key::Backspace if self.cursor > 0 => {
self.cursor -= 1;
remove_char(&mut self.content, self.cursor);
Key::End => self.cursor = self.content.len(),
Key::Left if self.cursor > 0 => {
let len = self.content[..self.cursor]
.graphemes(true)
.last()
.unwrap()
.len();
self.cursor -= len;
}
Key::Del if self.cursor < self.content.chars().count() => {
remove_char(&mut self.content, self.cursor);
Key::Right if self.cursor < self.content.len() => {
let len = self.content[self.cursor..]
.graphemes(true)
.next()
.unwrap()
.len();
self.cursor += len;
}
Key::Backspace if self.cursor > 0 => {
let len = self.content[..self.cursor]
.graphemes(true)
.last()
.unwrap()
.len();
self.cursor -= len;
self.content.remove(self.cursor);
}
Key::Del if self.cursor < self.content.len() => {
self.content.remove(self.cursor);
}
_ => return EventResult::Ignored,
}
@ -165,20 +199,51 @@ impl View for EditView {
// Keep cursor in [offset, offset+last_length] by changing offset
// So keep offset in [last_length-cursor,cursor]
// Also call this on resize, but right now it is an event like any other
if self.cursor >= self.offset + self.last_length {
self.offset = self.cursor - self.last_length + 1;
} else if self.cursor < self.offset {
if self.cursor < self.offset {
self.offset = self.cursor;
}
if self.offset + self.last_length > self.content.len() + 1 {
self.offset = if self.content.len() > self.last_length {
self.content.len() - self.last_length + 1
} else {
0
};
// So we're against the right wall.
// Let's find how much space will be taken by the selection (either a char, or _)
let c_len = self.content[self.cursor..]
.graphemes(true)
.map(|g| g.width())
.next()
.unwrap_or(1);
// Now, we have to fit self.content[..self.cursor] into self.last_length - c_len.
let available = self.last_length - c_len;
// Look at the content before the cursor (we will print its tail).
// From the end, count the length until we reach `available`.
// Then sum the byte lengths.
let tail_bytes =
tail_bytes(&self.content[self.offset..self.cursor], available);
self.offset = self.cursor - tail_bytes;
assert!(self.cursor >= self.offset);
}
// If we have too much space
if self.content[self.offset..].width() < self.last_length {
let tail_bytes = tail_bytes(&self.content, self.last_length - 1);
self.offset = self.content.len() - tail_bytes;
}
EventResult::Consumed(None)
}
}
// Return the number of bytes, from the end of text,
// which constitute the longest tail that fits in the given width.
fn tail_bytes(text: &str, width: usize) -> usize {
text.graphemes(true)
.rev()
.scan(0, |w, g| {
*w += g.width();
if *w > width {
None
} else {
Some(g)
}
})
.map(|g| g.len())
.fold(0, |a, b| a + b)
}

6
src/view/select_view.rs
View File

@ -9,6 +9,8 @@ use event::{Event, EventResult, Key};
use vec::Vec2;
use printer::Printer;
use unicode_width::UnicodeWidthStr;
struct Item<T> {
label: String,
value: Rc<T>,
@ -134,7 +136,7 @@ impl<T: 'static> View for SelectView<T> {
self.scrollbase.draw(printer, |printer, i| {
printer.with_selection(i == self.focus, |printer| {
let l = self.items[i].label.chars().count();
let l = self.items[i].label.width();
let x = self.align.h.get_offset(l, printer.size.x);
printer.print_hline((0, 0), x, " ");
printer.print((x, 0), &self.items[i].label);
@ -149,7 +151,7 @@ impl<T: 'static> View for SelectView<T> {
// we'll still return our longest item.
let w = self.items
.iter()
.map(|item| item.label.len())
.map(|item| item.label.width())
.max()
.unwrap_or(1);
let h = self.items.len();

12
src/view/text_view.rs
View File

@ -7,6 +7,8 @@ use align::*;
use event::*;
use super::scroll::ScrollBase;
use unicode_width::UnicodeWidthStr;
/// A simple view showing a fixed text
pub struct TextView {
content: String,
@ -40,7 +42,7 @@ fn get_line_span(line: &str, max_width: usize) -> usize {
// (Or use a common function? Better!)
let mut lines = 1;
let mut length = 0;
for l in line.split(' ').map(|word| word.chars().count()) {
for l in line.split(' ').map(|word| word.width()) {
length += l;
if length > max_width {
length = l;
@ -111,7 +113,7 @@ impl TextView {
for line in self.content.split('\n') {
height += 1;
max_width = max(max_width, line.chars().count());
max_width = max(max_width, line.width());
}
Vec2::new(max_width, height)
@ -150,7 +152,7 @@ impl<'a> Iterator for LinesIterator<'a> {
let content = &self.content[self.start..];
if let Some(next) = content.find('\n') {
if content[..next].chars().count() <= self.width {
if content[..next].width() <= self.width {
// We found a newline before the allowed limit.
// Break early.
self.start += next + 1;
@ -161,7 +163,7 @@ impl<'a> Iterator for LinesIterator<'a> {
}
}
let content_len = content.chars().count();
let content_len = content.width();
if content_len <= self.width {
// I thought it would be longer! -- that's what she said :(
self.start += content.len();
@ -209,7 +211,7 @@ impl View for TextView {
self.scrollbase.draw(printer, |printer, i| {
let row = &self.rows[i];
let text = &self.content[row.start..row.end];
let l = text.chars().count();
let l = text.width();
let x = self.align.h.get_offset(l, printer.size.x);
printer.print((x, 0), text);
});