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* Paper.js - The Swiss Army Knife of Vector Graphics Scripting.
* http://paperjs.org/
*
* Copyright (c) 2011 - 2020, Jürg Lehni & Jonathan Puckey
* http://juerglehni.com/ & https://puckey.studio/
*
* Distributed under the MIT license. See LICENSE file for details.
*
* All rights reserved.
*/
// TODO: remove eslint-disable comment and deal with errors over time
/* eslint-disable */
import { ref } from '~/globals';
import { Base } from '~/straps';
import { DomEvent } from '~/dom/DomEvent';
import { View } from '~/view/View';
/**
* @name Key
* @namespace
*/
// @ts-expect-error
export const Key = new (function () {
var keyLookup = {
// Unify different key identifier naming schemes, e.g. on Gecko, IE:
'\t': 'tab',
' ': 'space',
'\b': 'backspace',
'\x7f': 'delete',
Spacebar: 'space',
Del: 'delete',
Win: 'meta',
Esc: 'escape',
},
// To find corresponding characters for special keys in keydown events:
charLookup = {
tab: '\t',
space: ' ',
enter: '\r',
},
// Only keypress reliable gets char-codes that are actually representing
// characters with all modifiers taken into account across all browsers.
// So we need to perform a little trickery here to use these codes with
// onKeyDown/Up:
// - keydown is used to handle modifiers and special keys such as
// arrows, space, control, etc, for which events are fired right away.
// - keypress fires the actual onKeyDown event for all other keys.
// - keyup handles the onKeyUp events for both.
keyMap = {}, // Map for currently pressed keys
charMap = {}, // key -> char mappings for pressed keys
metaFixMap, // Keys that will not receive keyup events due to Mac bug
downKey, // The key from the keydown event, if it wasn't handled already
// Use new Base() to convert into a Base object, for #toString()
modifiers = new Base({
shift: false,
control: false,
alt: false, // WAS: option
meta: false, // WAS: command
capsLock: false,
space: false,
}).inject({
// Short-cut to modifiers.alt for backward compatibility
option: {
get: function () {
return this.alt;
},
},
// Platform independent short-cut to modifiers.control / meta,
// based on whichever key is used for commands.
command: {
get: function () {
var agent = ref.paper && ref.paper.agent;
return agent && agent.mac ? this.meta : this.control;
},
},
});
function getKey(event) {
var key = event.key || event.keyIdentifier;
key = /^U\+/.test(key)
? // Expand keyIdentifier Unicode format.
String.fromCharCode(parseInt(key.substr(2), 16))
: // Use short version for arrow keys: ArrowLeft -> Left
/^Arrow[A-Z]/.test(key)
? key.substr(5)
: // This is far from ideal, but what else can we do?
key === 'Unidentified' || key === undefined
? String.fromCharCode(event.keyCode)
: key;
return (
keyLookup[key] ||
// Hyphenate camel-cased special keys, lower-case normal ones:
(key.length > 1 ? Base.hyphenate(key) : key.toLowerCase())
);
}
function handleKey(down, key, character, event) {
var type = down ? 'keydown' : 'keyup',
view = View._focused,
name;
keyMap[key] = down;
// Link the key from keydown with the character form keypress, so keyup
// can retrieve the character again.
// Use delete instead of setting to null, so charMap only contains keys
// that are currently pressed, allowing the use of `key in charMap`
// checks and enumeration over pressed keys, e.g. in the blur event.
if (down) {
charMap[key] = character;
} else {
delete charMap[key];
}
// Detect modifiers and mark them as pressed / released
if (key.length > 1 && (name = Base.camelize(key)) in modifiers) {
modifiers[name] = down;
var agent = ref.paper && ref.paper.agent;
if (name === 'meta' && agent && agent.mac) {
// Fix a strange behavior on Mac where no keyup events are
// received for any keys pressed while the meta key is down.
// Keep track of the normal keys being pressed and trigger keyup
// events for all these keys when meta is released:
if (down) {
metaFixMap = {};
} else {
for (var k in metaFixMap) {
// Make sure it wasn't released already in the meantime:
if (k in charMap) handleKey(false, k, metaFixMap[k], event);
}
metaFixMap = null;
}
}
} else if (down && metaFixMap) {
// A normal key, add it to metaFixMap if that's defined.
metaFixMap[key] = character;
}
if (view) {
view._handleKeyEvent(down ? 'keydown' : 'keyup', event, key, character);
}
}
DomEvent.add(globalThis.document, {
keydown: function (event) {
var key = getKey(event),
agent = ref.paper && ref.paper.agent;
// Directly handle any special keys (key.length > 1) in keydown, as
// not all of them will receive keypress events.
// Chrome doesn't fire keypress events for command and alt keys,
// so we need to handle this in a way that works across all OSes.
if (
key.length > 1 ||
(agent && agent.chrome && (event.altKey || (agent.mac && event.metaKey) || (!agent.mac && event.ctrlKey)))
) {
handleKey(true, key, charLookup[key] || (key.length > 1 ? '' : key), event);
} else {
// If it wasn't handled yet, store the downKey so keypress can
// compare and handle buggy edge cases, known to happen in
// Chrome on Ubuntu.
downKey = key;
}
},
keypress: function (event) {
if (downKey) {
var key = getKey(event),
code = event.charCode,
// Try event.charCode if its above 32 and fall back onto the
// key value if it's a single character, empty otherwise.
character = code >= 32 ? String.fromCharCode(code) : key.length > 1 ? '' : key;
if (key !== downKey) {
// This shouldn't happen, but it does in Chrome on Ubuntu.
// In these cases, character is actually the key we want!
// See #881
key = character.toLowerCase();
}
handleKey(true, key, character, event);
downKey = null;
}
},
keyup: function (event) {
var key = getKey(event);
if (key in charMap) handleKey(false, key, charMap[key], event);
},
});
DomEvent.add(globalThis.window, {
blur: function (event) {
// Emit key-up events for all currently pressed keys.
for (var key in charMap) handleKey(false, key, charMap[key], event);
},
});
return /** @lends Key */ {
/**
* The current state of the keyboard modifiers.
*
* @property
* @type Object
*
* @option modifiers.shift {Boolean} {@true if the shift key is
* pressed}.
* @option modifiers.control {Boolean} {@true if the control key is
* pressed}.
* @option modifiers.alt {Boolean} {@true if the alt/option key is
* pressed}.
* @option modifiers.meta {Boolean} {@true if the meta/windows/command
* key is pressed}.
* @option modifiers.capsLock {Boolean} {@true if the caps-lock key is
* active}.
* @option modifiers.space {Boolean} {@true if the space key is
* pressed}.
* @option modifiers.option {Boolean} {@true if the alt/option key is
* pressed}. This is the same as `modifiers.alt`
* @option modifiers.command {Boolean} {@true if the meta key is pressed
* on Mac, or the control key is pressed on Windows and Linux}.
*/
modifiers: modifiers,
/**
* Checks whether the specified key is pressed.
*
* @param {String} key any character or special key descriptor:
* {@values 'enter', 'space', 'shift', 'control', 'alt', 'meta',
* 'caps-lock', 'left', 'up', 'right', 'down', 'escape', 'delete',
* ...}
* @return {Boolean} {@true if the key is pressed}
*
* @example
* // Whenever the user clicks, create a circle shaped path. If the
* // 'a' key is pressed, fill it with red, otherwise fill it with blue:
* function onMouseDown(event) {
* var path = new Path.Circle(event.point, 10);
* if (Key.isDown('a')) {
* path.fillColor = 'red';
* } else {
* path.fillColor = 'blue';
* }
* }
*/
isDown: function (key) {
return !!keyMap[key];
},
};
})();
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