mirror of https://git.meli.delivery/meli/meli
utilities/widgets.rs: move text field to its own module
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/*
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* meli
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*
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* Copyright 2017-2020 Manos Pitsidianakis
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*
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* This file is part of meli.
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*
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* meli is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* meli is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with meli. If not, see <http://www.gnu.org/licenses/>.
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*/
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use super::*;
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pub struct TextField {
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inner: UText,
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autocomplete: Option<(AutoCompleteFn, Box<AutoComplete>)>,
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}
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impl Debug for TextField {
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fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
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fmt.debug_struct(stringify!(TextField))
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.field("inner", &self.inner)
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.field("has AutoComplete", &self.autocomplete.is_some())
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.finish()
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}
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}
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impl Default for TextField {
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fn default() -> TextField {
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Self {
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inner: UText::new(String::with_capacity(256)),
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autocomplete: None,
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}
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}
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}
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impl TextField {
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pub fn new(inner: UText, autocomplete: Option<(AutoCompleteFn, Box<AutoComplete>)>) -> Self {
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Self {
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inner,
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autocomplete,
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}
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}
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pub fn as_str(&self) -> &str {
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self.inner.as_str()
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}
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pub fn cursor(&self) -> usize {
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self.inner.grapheme_pos()
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}
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pub fn cursor_inc(&mut self) {
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self.inner.cursor_inc();
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}
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pub fn cursor_dec(&mut self) {
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self.inner.cursor_dec();
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}
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pub fn is_empty(&self) -> bool {
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self.as_str().is_empty()
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}
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pub fn into_string(self) -> String {
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self.inner.into_string()
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}
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pub fn clear(&mut self) {
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self.inner.clear()
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}
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pub fn draw_cursor(
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&mut self,
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grid: &mut CellBuffer,
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area: Area,
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secondary_area: Area,
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context: &mut Context,
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) {
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let upper_left = upper_left!(area);
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let width = width!(area);
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let pos = if width < self.inner.grapheme_pos() {
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width
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} else {
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self.inner.grapheme_pos()
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};
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change_colors(
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grid,
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(pos_inc(upper_left, (pos, 0)), pos_inc(upper_left, (pos, 0))),
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crate::conf::value(context, "theme_default").fg,
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crate::conf::value(context, "highlight").bg,
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);
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if self.inner.grapheme_len() <= 2 {
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return;
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}
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if let Some((autocomplete_fn, autocomplete)) = self.autocomplete.as_mut() {
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let entries = autocomplete_fn(context, self.inner.as_str());
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autocomplete.set_suggestions(entries);
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autocomplete.draw(grid, secondary_area, context);
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}
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}
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}
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impl Component for TextField {
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fn draw(&mut self, grid: &mut CellBuffer, area: Area, context: &mut Context) {
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let theme_attr = crate::conf::value(context, "widgets.form.field");
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let width = width!(area);
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let str = self.as_str();
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/* Calculate which part of the str is visible
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* ##########################################
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*
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* Example:
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* For the string "The quick brown fox jumps over the lazy dog" with visible
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* width of field of 10 columns
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*
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*
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* Cursor <= width
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* =================
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* Cursor at:
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* ⇩
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* The quick brown fox jumps over the lazy dog
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*
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* cursor
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* ⇩
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* ┌──────────┐
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* │The quick │ brown fox jumps over the lazy dog
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* └──────────┘
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*
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* No skip.
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*
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* Cursor at the end
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* =================
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* Cursor at:
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* ⇩
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* The quick brown fox jumps over the lazy dog
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*
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* remainder cursor
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* ⇩⇩⇩⇩⇩ ⇩
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* +╌╌╌+╭┅┅┅┅┅┅┅┅┅┅╮╭┅┅┅┅┅┅┅┅┅┅╮╭┅┅┅┅┅┅┅┅┅┅╮┌──────────┐
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* |The|┊ quick bro┊┊wn fox jum┊┊ps over th┊│e lazy dog│
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* +╌╌╌+╰┅┅┅┅┅┅┅┅┅┅╯╰┅┅┅┅┅┅┅┅┅┅╯╰┅┅┅┅┅┅┅┅┅┅╯└──────────┘
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* ⇧⇧⇧++⇧⇧⇧⇧⇧⇧⇧⇧⇧⇧++⇧⇧⇧⇧⇧⇧⇧⇧⇧⇧++⇧⇧⇧⇧⇧⇧⇧⇧⇧⇧
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* skip offset
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*
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* Intermediate cursor
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* ===================
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* Cursor at:
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* ⇩
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* The quick brown fox jumps over the lazy dog
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*
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* remainder cursor
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* ⇩ ⇩
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* +╭┅┅┅┅┅┅┅┅┅┅╮╭┅┅┅┅┅┅┅┅┅┅╮┌──────────┐
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* T|he quick b┊┊rown fox j┊│umps over │ the lazy dog
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* +╰┅┅┅┅┅┅┅┅┅┅╯╰┅┅┅┅┅┅┅┅┅┅╯└──────────┘
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* ⇧+⇧⇧⇧⇧⇧⇧⇧⇧⇧⇧++⇧⇧⇧⇧⇧⇧⇧⇧⇧⇧
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* skip offset
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*/
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write_string_to_grid(
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if width < self.inner.grapheme_pos() {
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str.trim_left_at_boundary(
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width
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* self
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.inner
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.grapheme_pos()
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.wrapping_div(width)
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.saturating_sub(1)
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+ self.inner.grapheme_pos().wrapping_rem(width),
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)
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} else {
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str
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},
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grid,
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theme_attr.fg,
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theme_attr.bg,
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theme_attr.attrs,
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area,
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None,
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);
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}
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fn process_event(&mut self, event: &mut UIEvent, context: &mut Context) -> bool {
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match *event {
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UIEvent::InsertInput(Key::Char('\t')) => {
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if let Some(suggestion) = self
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.autocomplete
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.as_mut()
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.and_then(|a| a.1.get_suggestion())
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{
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self.inner = UText::new(suggestion);
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let len = self.inner.as_str().len();
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self.inner.set_cursor(len);
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} else {
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self.inner.insert_char(' ');
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}
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}
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UIEvent::InsertInput(Key::Char('\n')) => {
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if let Some(suggestion) = self
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.autocomplete
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.as_mut()
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.and_then(|a| a.1.get_suggestion())
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{
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self.inner = UText::new(suggestion);
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let len = self.inner.as_str().len();
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self.inner.set_cursor(len);
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}
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context
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.replies
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.push_back(UIEvent::ChangeMode(UIMode::Normal));
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}
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UIEvent::InsertInput(Key::Up) => {
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if let Some(ac) = self.autocomplete.as_mut() {
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ac.1.dec_cursor();
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} else {
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return false;
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}
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}
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UIEvent::InsertInput(Key::Down) => {
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if let Some(ac) = self.autocomplete.as_mut() {
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ac.1.inc_cursor();
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} else {
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return false;
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}
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}
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UIEvent::InsertInput(Key::Right) => {
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self.inner.cursor_inc();
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}
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UIEvent::InsertInput(Key::Left) => {
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self.inner.cursor_dec();
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}
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UIEvent::InsertInput(Key::Char(k)) => {
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self.inner.insert_char(k);
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}
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UIEvent::InsertInput(Key::Paste(ref p)) => {
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for c in p.chars() {
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self.inner.insert_char(c);
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}
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}
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UIEvent::InsertInput(Key::Alt('b')) => { /* Meta+B Backward one word */ }
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UIEvent::InsertInput(Key::Backspace) | UIEvent::InsertInput(Key::Ctrl('h')) => {
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/* Ctrl+H Delete previous character */
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self.inner.backspace();
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if let Some(ac) = self.autocomplete.as_mut() {
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ac.1.set_suggestions(Vec::new());
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}
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}
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UIEvent::InsertInput(Key::Ctrl('t')) => {
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/* Ctrl+T Transpose characters */
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self.inner.set_cursor(0);
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}
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UIEvent::InsertInput(Key::Ctrl('a')) => {
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/* Beginning of line */
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self.inner.set_cursor(0);
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}
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UIEvent::InsertInput(Key::Ctrl('b')) => {
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/* Backward one character */
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self.inner.cursor_dec();
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}
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UIEvent::InsertInput(Key::Ctrl('d')) => {
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/* Delete one character */
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self.inner.cursor_dec();
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}
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UIEvent::InsertInput(Key::Ctrl('f')) => {
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/* Ctrl+F / → Forward one character */
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self.inner.cursor_inc();
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}
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UIEvent::InsertInput(Key::Ctrl('w')) => {
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/* Cut previous word */
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while self.inner.as_str()[..self.inner.cursor_pos()]
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.last_grapheme()
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.map(|(_, graph)| !graph.is_empty() && graph.trim().is_empty())
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.unwrap_or(false)
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{
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self.inner.backspace();
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}
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while self.inner.as_str()[..self.inner.cursor_pos()]
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.last_grapheme()
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.map(|(_, graph)| !graph.is_empty() && !graph.trim().is_empty())
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.unwrap_or(false)
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{
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self.inner.backspace();
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}
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}
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UIEvent::InsertInput(Key::Ctrl('u')) => self.inner.cut_left(),
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UIEvent::InsertInput(Key::Ctrl('e')) => {
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/* Ctrl+E End of line */
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self.inner.set_cursor(self.inner.as_str().len());
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}
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/* TODO: add rest of readline shortcuts */
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_ => {
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return false;
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}
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}
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self.set_dirty(true);
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true
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}
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fn is_dirty(&self) -> bool {
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false
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}
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fn set_dirty(&mut self, _value: bool) {}
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fn id(&self) -> ComponentId {
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ComponentId::nil()
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}
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fn set_id(&mut self, _id: ComponentId) {}
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}
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impl fmt::Display for TextField {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", self.as_str(),)
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}
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}
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