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