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69 lines
2.0 KiB
69 lines
2.0 KiB
/** Modified from original Node-Red source, for audio system visualization
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* vim: set ts=4:
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* Copyright 2013 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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RED.keyboard = (function() {
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var active = true;
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var handlers = {};
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d3.select(window).on("keydown",function() {
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if (!active) { return; }
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var handler = handlers[d3.event.keyCode];
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if (handler && handler.ondown) {
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if (!handler.modifiers ||
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((!handler.modifiers.shift || d3.event.shiftKey) &&
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(!handler.modifiers.ctrl || d3.event.ctrlKey ) &&
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(!handler.modifiers.alt || d3.event.altKey ) )) {
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handler.ondown();
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}
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}
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});
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d3.select(window).on("keyup",function() {
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if (!active) { return; }
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var handler = handlers[d3.event.keyCode];
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if (handler && handler.onup) {
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if (!handler.modifiers ||
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((!handler.modifiers.shift || d3.event.shiftKey) &&
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(!handler.modifiers.ctrl || d3.event.ctrlKey ) &&
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(!handler.modifiers.alt || d3.event.altKey ) )) {
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handler.onup();
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}
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}
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});
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function addHandler(key,modifiers,ondown,onup) {
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var mod = modifiers;
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var cbdown = ondown;
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var cbup = onup;
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if (typeof modifiers == "function") {
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mod = {};
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cbdown = modifiers;
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cbup = ondown;
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}
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handlers[key] = {modifiers:mod, ondown:cbdown, onup:cbup};
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}
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function removeHandler(key) {
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delete handlers[key];
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}
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return {
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add: addHandler,
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remove: removeHandler,
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disable: function(){ active = false;},
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enable: function(){ active = true; }
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}
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})();
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