refactor input system
This commit is contained in:
alice pellerin
+261
@@ -0,0 +1,261 @@
|
||||
use std::cmp::min;
|
||||
|
||||
use crate::{BYTES_PER_LINE, app::{App, Mode, PartialAction}};
|
||||
|
||||
#[derive(Clone, Copy)]
|
||||
pub enum Action {
|
||||
Quit,
|
||||
|
||||
NormalMode,
|
||||
SelectMode,
|
||||
|
||||
GPartial,
|
||||
ZPartial,
|
||||
RPartial,
|
||||
|
||||
MoveByteUp,
|
||||
MoveByteDown,
|
||||
MoveByteLeft,
|
||||
MoveByteRight,
|
||||
|
||||
GotoLineStart,
|
||||
GotoLineEnd,
|
||||
GotoFileStart,
|
||||
GotoFileEnd,
|
||||
|
||||
ScrollDown,
|
||||
ScrollUp,
|
||||
|
||||
PageCursorHalfDown,
|
||||
PageCursorHalfUp,
|
||||
|
||||
PageDown,
|
||||
PageUp,
|
||||
|
||||
MoveNextWordStart,
|
||||
MoveNextWordEnd,
|
||||
MovePreviousWordStart,
|
||||
|
||||
CollapseSelection,
|
||||
}
|
||||
|
||||
impl App {
|
||||
pub fn execute(&mut self, action: Action) {
|
||||
match action {
|
||||
Action::Quit => self.quit(),
|
||||
|
||||
Action::NormalMode => self.normal_mode(),
|
||||
Action::SelectMode => self.select_mode(),
|
||||
|
||||
Action::GPartial => self.g_partial(),
|
||||
Action::ZPartial => self.z_partial(),
|
||||
Action::RPartial => self.r_partial(),
|
||||
|
||||
Action::MoveByteUp => self.move_byte_up(),
|
||||
Action::MoveByteDown => self.move_byte_down(),
|
||||
Action::MoveByteLeft => self.move_byte_left(),
|
||||
Action::MoveByteRight => self.move_byte_right(),
|
||||
|
||||
Action::GotoLineStart => self.goto_line_start(),
|
||||
Action::GotoLineEnd => self.goto_line_end(),
|
||||
Action::GotoFileStart => self.goto_file_start(),
|
||||
Action::GotoFileEnd => self.goto_file_end(),
|
||||
|
||||
Action::ScrollDown => self.scroll_down(),
|
||||
Action::ScrollUp => self.scroll_up(),
|
||||
|
||||
Action::PageCursorHalfDown => self.page_cursor_half_down(),
|
||||
Action::PageCursorHalfUp => self.page_cursor_half_up(),
|
||||
|
||||
Action::PageDown => self.page_down(),
|
||||
Action::PageUp => self.page_up(),
|
||||
|
||||
Action::MoveNextWordStart => self.move_next_word_start(),
|
||||
Action::MoveNextWordEnd => self.move_next_word_end(),
|
||||
Action::MovePreviousWordStart => self.move_previous_word_start(),
|
||||
|
||||
Action::CollapseSelection => self.collapse_selection(),
|
||||
}
|
||||
}
|
||||
|
||||
const fn quit(&mut self) {
|
||||
self.should_quit = true;
|
||||
}
|
||||
|
||||
const fn normal_mode(&mut self) {
|
||||
self.mode = Mode::Normal;
|
||||
}
|
||||
|
||||
const fn select_mode(&mut self) {
|
||||
self.mode = Mode::Select;
|
||||
}
|
||||
|
||||
const fn g_partial(&mut self) {
|
||||
self.partial_action = Some(PartialAction::Goto);
|
||||
}
|
||||
|
||||
const fn z_partial(&mut self) {
|
||||
self.partial_action = Some(PartialAction::Zview);
|
||||
}
|
||||
|
||||
const fn r_partial(&mut self) {
|
||||
self.partial_action = Some(PartialAction::Replace);
|
||||
}
|
||||
|
||||
const fn move_byte_up(&mut self) {
|
||||
if self.cursor.head >= BYTES_PER_LINE {
|
||||
self.cursor.head -= BYTES_PER_LINE;
|
||||
self.cursor.collapse();
|
||||
|
||||
self.clamp_screen_to_cursor();
|
||||
}
|
||||
}
|
||||
|
||||
const fn move_byte_down(&mut self) {
|
||||
if self.contents.len() - 1 - self.cursor.head >= BYTES_PER_LINE {
|
||||
self.cursor.head += BYTES_PER_LINE;
|
||||
self.cursor.collapse();
|
||||
|
||||
self.clamp_screen_to_cursor();
|
||||
}
|
||||
}
|
||||
|
||||
const fn move_byte_left(&mut self) {
|
||||
if self.cursor.head >= 1 {
|
||||
self.cursor.head -= 1;
|
||||
self.cursor.collapse();
|
||||
|
||||
self.clamp_screen_to_cursor();
|
||||
}
|
||||
}
|
||||
|
||||
const fn move_byte_right(&mut self) {
|
||||
if self.contents.len() - 1 - self.cursor.head >= 1 {
|
||||
self.cursor.head += 1;
|
||||
self.cursor.collapse();
|
||||
|
||||
self.clamp_screen_to_cursor();
|
||||
}
|
||||
}
|
||||
|
||||
const fn goto_line_start(&mut self) {
|
||||
self.cursor.head -= self.cursor.head % BYTES_PER_LINE;
|
||||
self.cursor.collapse();
|
||||
}
|
||||
|
||||
const fn goto_line_end(&mut self) {
|
||||
self.cursor.head += BYTES_PER_LINE - 1 - (self.cursor.head % BYTES_PER_LINE);
|
||||
self.cursor.collapse();
|
||||
}
|
||||
|
||||
const fn goto_file_start(&mut self) {
|
||||
self.cursor.head %= BYTES_PER_LINE;
|
||||
self.cursor.collapse();
|
||||
self.clamp_screen_to_cursor();
|
||||
}
|
||||
|
||||
const fn goto_file_end(&mut self) {
|
||||
self.cursor.head = previous_multiple_of(BYTES_PER_LINE, self.contents.len()) +
|
||||
(self.cursor.head % BYTES_PER_LINE);
|
||||
|
||||
self.cursor.collapse();
|
||||
self.clamp_screen_to_cursor();
|
||||
}
|
||||
|
||||
fn scroll_down(&mut self) {
|
||||
self.scroll_position = min(
|
||||
self.scroll_position + BYTES_PER_LINE,
|
||||
self.contents.len() - (5 * BYTES_PER_LINE)
|
||||
);
|
||||
self.cursor.clamp(self.scroll_position, self.screen_size());
|
||||
}
|
||||
|
||||
fn scroll_up(&mut self) {
|
||||
self.scroll_position = self.scroll_position.saturating_sub(BYTES_PER_LINE);
|
||||
self.cursor.clamp(self.scroll_position, self.screen_size());
|
||||
}
|
||||
|
||||
fn page_cursor_half_down(&mut self) {
|
||||
let head_offset = self.cursor.head - self.scroll_position;
|
||||
let tail_offset = self.cursor.tail - self.scroll_position;
|
||||
|
||||
self.scroll_position = min(
|
||||
self.scroll_position + (self.screen_size() / 2).next_multiple_of(BYTES_PER_LINE),
|
||||
self.contents.len() - (5 * BYTES_PER_LINE)
|
||||
);
|
||||
|
||||
self.cursor.head = (self.scroll_position + head_offset).min(self.contents.len() - 1);
|
||||
self.cursor.tail = (self.scroll_position + tail_offset).min(self.contents.len() - 1);
|
||||
}
|
||||
|
||||
fn page_cursor_half_up(&mut self) {
|
||||
let head_offset = self.cursor.head - self.scroll_position;
|
||||
let tail_offset = self.cursor.tail - self.scroll_position;
|
||||
|
||||
self.scroll_position = self.scroll_position.saturating_sub(
|
||||
(self.screen_size() / 2).next_multiple_of(BYTES_PER_LINE)
|
||||
);
|
||||
|
||||
self.cursor.head = (self.scroll_position + head_offset).min(self.contents.len() - 1);
|
||||
self.cursor.tail = (self.scroll_position + tail_offset).min(self.contents.len() - 1);
|
||||
}
|
||||
|
||||
fn page_down(&mut self) {
|
||||
self.scroll_position = min(
|
||||
self.scroll_position + self.screen_size(),
|
||||
self.contents.len() - (5 * BYTES_PER_LINE)
|
||||
);
|
||||
self.cursor.clamp(self.scroll_position, self.screen_size());
|
||||
}
|
||||
|
||||
fn page_up(&mut self) {
|
||||
self.scroll_position = self.scroll_position.saturating_sub(
|
||||
self.screen_size()
|
||||
);
|
||||
self.cursor.clamp(self.scroll_position, self.screen_size());
|
||||
}
|
||||
|
||||
fn move_next_word_start(&mut self) {
|
||||
self.cursor.move_to_next_word(self.contents.len() - 1);
|
||||
self.clamp_screen_to_cursor();
|
||||
}
|
||||
|
||||
fn move_next_word_end(&mut self) {
|
||||
self.cursor.move_to_next_end(self.contents.len() - 1);
|
||||
self.clamp_screen_to_cursor();
|
||||
}
|
||||
|
||||
const fn move_previous_word_start(&mut self) {
|
||||
self.cursor.move_to_previous_beginning();
|
||||
self.clamp_screen_to_cursor();
|
||||
}
|
||||
|
||||
const fn collapse_selection(&mut self) {
|
||||
self.cursor.collapse();
|
||||
}
|
||||
}
|
||||
|
||||
// helpers
|
||||
impl App {
|
||||
// in bytes
|
||||
const fn screen_size(&self) -> usize {
|
||||
self.window_rows * BYTES_PER_LINE
|
||||
}
|
||||
|
||||
const fn clamp_screen_to_cursor(&mut self) {
|
||||
if self.cursor.head < self.scroll_position {
|
||||
self.scroll_position -= (self.scroll_position - self.cursor.head).next_multiple_of(BYTES_PER_LINE);
|
||||
} else if self.cursor.head > self.scroll_position + self.screen_size() - 1 {
|
||||
let screen_edge_offset_to_cursor = self.cursor.head - (self.scroll_position + self.screen_size() - 1);
|
||||
self.scroll_position += screen_edge_offset_to_cursor.next_multiple_of(BYTES_PER_LINE);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
const fn previous_multiple_of(multiple: usize, number: usize) -> usize {
|
||||
if number == 0 {
|
||||
0
|
||||
} else {
|
||||
(number - 1) - ((number - 1) % multiple)
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user