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author | Matt A. Tobin <email@mattatobin.com> | 2018-02-10 02:51:36 -0500 |
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committer | Matt A. Tobin <email@mattatobin.com> | 2018-02-10 02:51:36 -0500 |
commit | 37d5300335d81cecbecc99812747a657588c63eb (patch) | |
tree | 765efa3b6a56bb715d9813a8697473e120436278 /toolkit/jetpack/sdk/keyboard/hotkeys.js | |
parent | b2bdac20c02b12f2057b9ef70b0a946113a00e00 (diff) | |
parent | 4fb11cd5966461bccc3ed1599b808237be6b0de9 (diff) | |
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Merge branch 'ext-work'
Diffstat (limited to 'toolkit/jetpack/sdk/keyboard/hotkeys.js')
-rw-r--r-- | toolkit/jetpack/sdk/keyboard/hotkeys.js | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/toolkit/jetpack/sdk/keyboard/hotkeys.js b/toolkit/jetpack/sdk/keyboard/hotkeys.js new file mode 100644 index 000000000..a179502b8 --- /dev/null +++ b/toolkit/jetpack/sdk/keyboard/hotkeys.js @@ -0,0 +1,110 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +"use strict"; + +module.metadata = { + "stability": "unstable" +}; + +const { observer: keyboardObserver } = require("./observer"); +const { getKeyForCode, normalize, isFunctionKey, + MODIFIERS } = require("./utils"); + +/** + * Register a global `hotkey` that executes `listener` when the key combination + * in `hotkey` is pressed. If more then one `listener` is registered on the same + * key combination only last one will be executed. + * + * @param {string} hotkey + * Key combination in the format of 'modifier key'. + * + * Examples: + * + * "accel s" + * "meta shift i" + * "control alt d" + * + * Modifier keynames: + * + * - **shift**: The Shift key. + * - **alt**: The Alt key. On the Macintosh, this is the Option key. On + * Macintosh this can only be used in conjunction with another modifier, + * since `Alt+Letter` combinations are reserved for entering special + * characters in text. + * - **meta**: The Meta key. On the Macintosh, this is the Command key. + * - **control**: The Control key. + * - **accel**: The key used for keyboard shortcuts on the user's platform, + * which is Control on Windows and Linux, and Command on Mac. Usually, this + * would be the value you would use. + * + * @param {function} listener + * Function to execute when the `hotkey` is executed. + */ +exports.register = function register(hotkey, listener) { + hotkey = normalize(hotkey); + hotkeys[hotkey] = listener; +}; + +/** + * Unregister a global `hotkey`. If passed `listener` is not the one registered + * for the given `hotkey`, the call to this function will be ignored. + * + * @param {string} hotkey + * Key combination in the format of 'modifier key'. + * @param {function} listener + * Function that will be invoked when the `hotkey` is pressed. + */ +exports.unregister = function unregister(hotkey, listener) { + hotkey = normalize(hotkey); + if (hotkeys[hotkey] === listener) + delete hotkeys[hotkey]; +}; + +/** + * Map of hotkeys and associated functions. + */ +const hotkeys = exports.hotkeys = {}; + +keyboardObserver.on("keydown", function onKeypress(event, window) { + let key, modifiers = []; + let isChar = "isChar" in event && event.isChar; + let which = "which" in event ? event.which : null; + let keyCode = "keyCode" in event ? event.keyCode : null; + + if ("shiftKey" in event && event.shiftKey) + modifiers.push("shift"); + if ("altKey" in event && event.altKey) + modifiers.push("alt"); + if ("ctrlKey" in event && event.ctrlKey) + modifiers.push("control"); + if ("metaKey" in event && event.metaKey) + modifiers.push("meta"); + + // If it's not a printable character then we fall back to a human readable + // equivalent of one of the following constants. + // http://dxr.mozilla.org/mozilla-central/source/dom/interfaces/events/nsIDOMKeyEvent.idl + key = getKeyForCode(keyCode); + + // If only non-function (f1 - f24) key or only modifiers are pressed we don't + // have a valid combination so we return immediately (Also, sometimes + // `keyCode` may be one for the modifier which means we do not have a + // modifier). + if (!key || (!isFunctionKey(key) && !modifiers.length) || key in MODIFIERS) + return; + + let combination = normalize({ key: key, modifiers: modifiers }); + let hotkey = hotkeys[combination]; + + if (hotkey) { + try { + hotkey(); + } catch (exception) { + console.exception(exception); + } finally { + // Work around bug 582052 by preventing the (nonexistent) default action. + event.preventDefault(); + } + } +}); |