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Improve text_input::cursor API

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This commit is contained in:
Héctor Ramón Jiménez 2020-03-24 20:23:31 +01:00
parent 763f64b653
commit 6b89dd7db9
4 changed files with 170 additions and 141 deletions
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2
native/src/lib.rs
View file

@ -34,7 +34,7 @@
//! [`window::Renderer`]: window/trait.Renderer.html
//! [`UserInterface`]: struct.UserInterface.html
//! [renderer]: renderer/index.html
#![deny(missing_docs)]
//#![deny(missing_docs)]
#![deny(missing_debug_implementations)]
#![deny(unused_results)]
#![forbid(unsafe_code)]

78
native/src/widget/text_input.rs
View file

@ -4,17 +4,18 @@
//!
//! [`TextInput`]: struct.TextInput.html
//! [`State`]: struct.State.html
mod cursor;
pub mod cursor;
pub use cursor::Cursor;
use crate::{
input::{
keyboard,
mouse::{self, click},
ButtonState,
},
layout,
widget::text_input::cursor::Cursor,
Clipboard, Element, Event, Font, Hasher, Layout, Length, Point, Rectangle,
Size, Widget,
layout, Clipboard, Element, Event, Font, Hasher, Layout, Length, Point,
Rectangle, Size, Widget,
};
use std::u32;
@ -261,7 +262,8 @@ where
if self.is_secure {
self.state.cursor.select_all(&self.value);
} else {
let end = self.state.cursor.end();
let end = self.state.cursor.end(&self.value);
self.state.cursor.select_range(
self.value.previous_start_of_word(end),
self.value.next_end_of_word(end),
@ -307,7 +309,7 @@ where
self.font,
);
let pos = find_cursor_position(
let position = find_cursor_position(
renderer,
target + offset,
&value,
@ -317,9 +319,10 @@ where
self.font,
);
self.state
.cursor
.select_range(self.state.cursor.start(), pos);
self.state.cursor.select_range(
self.state.cursor.start(&value),
position,
);
}
}
}
@ -328,15 +331,15 @@ where
&& self.state.is_pasting.is_none()
&& !c.is_control() =>
{
match self.state.cursor.selection_position() {
match self.state.cursor.selection() {
Some((left, right)) => {
self.value.remove_many(left, right);
self.state.cursor.move_left();
self.state.cursor.move_left(&self.value);
}
_ => (),
}
self.value
.insert(self.state.cursor.end().min(self.value.len()), c);
self.value.insert(self.state.cursor.end(&self.value), c);
self.state.cursor.move_right(&self.value);
let message = (self.on_change)(self.value.to_string());
@ -353,19 +356,18 @@ where
}
}
keyboard::KeyCode::Backspace => {
match self.state.cursor.selection_position() {
match self.state.cursor.selection() {
Some((start, end)) => {
self.value.remove_many(start, end);
self.state.cursor.move_left();
self.state.cursor.move_left(&self.value);
}
None => {
if self.state.cursor.start().min(self.value.len())
> 0
{
self.state.cursor.move_left();
let _ = self
.value
.remove(self.state.cursor.start());
if self.state.cursor.start(&self.value) > 0 {
self.state.cursor.move_left(&self.value);
let _ = self.value.remove(
self.state.cursor.start(&self.value),
);
}
}
}
@ -373,15 +375,16 @@ where
messages.push(message);
}
keyboard::KeyCode::Delete => {
match self.state.cursor.selection_position() {
match self.state.cursor.selection() {
Some((start, end)) => {
self.value.remove_many(start, end);
self.state.cursor.move_left();
self.state.cursor.move_left(&self.value);
}
None => {
if self.state.cursor.end() < self.value.len() {
let _ =
self.value.remove(self.state.cursor.end());
let end = self.state.cursor.end(&self.value);
if end > 0 {
let _ = self.value.remove(end);
}
}
}
@ -398,9 +401,9 @@ where
self.state.cursor.move_left_by_words(&self.value);
}
} else if modifiers.shift {
self.state.cursor.select_left()
self.state.cursor.select_left(&self.value)
} else {
self.state.cursor.move_left();
self.state.cursor.move_left(&self.value);
}
}
keyboard::KeyCode::Right => {
@ -422,9 +425,10 @@ where
}
keyboard::KeyCode::Home => {
if modifiers.shift {
self.state
.cursor
.select_range(self.state.cursor.start(), 0);
self.state.cursor.select_range(
self.state.cursor.start(&self.value),
0,
);
} else {
self.state.cursor.move_to(0);
}
@ -432,7 +436,7 @@ where
keyboard::KeyCode::End => {
if modifiers.shift {
self.state.cursor.select_range(
self.state.cursor.start(),
self.state.cursor.start(&self.value),
self.value.len(),
);
} else {
@ -456,16 +460,16 @@ where
}
};
match self.state.cursor.selection_position() {
match self.state.cursor.selection() {
Some((left, right)) => {
self.value.remove_many(left, right);
self.state.cursor.move_left();
self.state.cursor.move_left(&self.value);
}
_ => (),
}
self.value.insert_many(
self.state.cursor.end().min(self.value.len()),
self.state.cursor.end(&self.value),
content.clone(),
);

98
native/src/widget/text_input/cursor.rs
View file

@ -1,7 +1,8 @@
//! Track the cursor of a text input.
use crate::widget::text_input::Value;
#[derive(Debug, Copy, Clone)]
enum State {
pub enum State {
Index(usize),
Selection { start: usize, end: usize },
}
@ -20,7 +21,6 @@ impl Default for Cursor {
}
impl Cursor {
/* index move methods */
pub fn move_to(&mut self, position: usize) {
self.state = State::Index(position);
}
@ -30,42 +30,40 @@ impl Cursor {
}
pub fn move_right_by_words(&mut self, value: &Value) {
self.move_to(value.next_end_of_word(self.right()))
self.move_to(value.next_end_of_word(self.right(value)))
}
pub fn move_right_by_amount(&mut self, value: &Value, amount: usize) {
match self.state {
match self.state(value) {
State::Index(index) => {
self.move_to(index.saturating_add(amount).min(value.len()))
}
State::Selection { .. } => self.move_to(self.right()),
State::Selection { start, end } => self.move_to(end.max(start)),
}
}
pub fn move_left(&mut self) {
match self.state {
pub fn move_left(&mut self, value: &Value) {
match self.state(value) {
State::Index(index) if index > 0 => self.move_to(index - 1),
State::Selection { .. } => self.move_to(self.left()),
State::Selection { start, end } => self.move_to(start.min(end)),
_ => self.move_to(0),
}
}
pub fn move_left_by_words(&mut self, value: &Value) {
self.move_to(value.previous_start_of_word(self.right()));
self.move_to(value.previous_start_of_word(self.left(value)));
}
/* end of index move methods */
/* expand/shrink selection */
pub fn select_range(&mut self, start: usize, end: usize) {
if start != end {
self.state = State::Selection { start, end };
} else {
if start == end {
self.state = State::Index(start);
} else {
self.state = State::Selection { start, end };
}
}
pub fn select_left(&mut self) {
match self.state {
pub fn select_left(&mut self, value: &Value) {
match self.state(value) {
State::Index(index) if index > 0 => {
self.select_range(index, index - 1)
}
@ -77,7 +75,7 @@ impl Cursor {
}
pub fn select_right(&mut self, value: &Value) {
match self.state {
match self.state(value) {
State::Index(index) if index < value.len() => {
self.select_range(index, index + 1)
}
@ -89,7 +87,7 @@ impl Cursor {
}
pub fn select_left_by_words(&mut self, value: &Value) {
match self.state {
match self.state(value) {
State::Index(index) => {
self.select_range(index, value.previous_start_of_word(index))
}
@ -100,7 +98,7 @@ impl Cursor {
}
pub fn select_right_by_words(&mut self, value: &Value) {
match self.state {
match self.state(value) {
State::Index(index) => {
self.select_range(index, value.next_end_of_word(index))
}
@ -113,51 +111,56 @@ impl Cursor {
pub fn select_all(&mut self, value: &Value) {
self.select_range(0, value.len());
}
/* end of selection section */
/* helpers */
// get start position of selection (can be left OR right boundary of selection) or index
pub(crate) fn start(&self) -> usize {
pub fn state(&self, value: &Value) -> State {
match self.state {
State::Index(index) => State::Index(index.min(value.len())),
State::Selection { start, end } => {
let start = start.min(value.len());
let end = end.min(value.len());
if start == end {
State::Index(start)
} else {
State::Selection { start, end }
}
}
}
}
pub fn start(&self, value: &Value) -> usize {
let start = match self.state {
State::Index(index) => index,
State::Selection { start, .. } => start,
}
};
start.min(value.len())
}
// get end position of selection (can be left OR right boundary of selection) or index
pub fn end(&self) -> usize {
match self.state {
pub fn end(&self, value: &Value) -> usize {
let end = match self.state {
State::Index(index) => index,
State::Selection { end, .. } => end,
}
};
end.min(value.len())
}
// get left boundary of selection or index
pub fn left(&self) -> usize {
match self.state {
fn left(&self, value: &Value) -> usize {
match self.state(value) {
State::Index(index) => index,
State::Selection { start, end } => start.min(end),
}
}
// get right boundary of selection or index
pub fn right(&self) -> usize {
match self.state {
fn right(&self, value: &Value) -> usize {
match self.state(value) {
State::Index(index) => index,
State::Selection { start, end } => start.max(end),
}
}
pub fn cursor_position(&self, value: &Value) -> usize {
match self.state {
State::Index(index) => index.min(value.len()),
State::Selection { end, .. } => end.min(value.len()),
}
}
// returns Option of left and right border of selection
// a second method that returns start and end may be useful (see below)
pub fn selection_position(&self) -> Option<(usize, usize)> {
pub fn selection(&self) -> Option<(usize, usize)> {
match self.state {
State::Selection { start, end } => {
Some((start.min(end), start.max(end)))
@ -165,11 +168,4 @@ impl Cursor {
_ => None,
}
}
/* pub fn selection_position(&self) -> Option<(usize, usize)> {
match self.state {
State::Selection { start, end } => Some((start, end)),
_ => None,
}
} */
}