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// Copyright (c) 2019 Teddy Wing
//
// This file is part of Muttagen.
//
// Muttagen is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Muttagen is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Muttagen. If not, see <https://www.gnu.org/licenses/>.
import key_codes, { KeyCode } from './key_codes';
export default function(
el: HTMLDocument | HTMLElement,
command: KeyCode[],
action: () => void
): void {
var key_buffer: number[] = [];
el.addEventListener('keydown', function(e: KeyboardEvent) {
command.forEach((key_code) => {
if (e.keyCode === key_code) {
key_buffer.push(key_code);
}
});
});
el.addEventListener('keyup', function(e: KeyboardEvent) {
if (key_buffer.length >= 2) {
var command_executed = key_buffer.length === command.length
&& key_buffer.every((value, index) => value === command[index]);
if (command_executed) {
action();
key_buffer = [];
}
}
});
};
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