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/**
* Copyright 2009 Google Inc.
*
* 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.
*/
function makeDraggable(jqueryNodes, eventHandler) {
jqueryNodes.each(function() {
var node = $(this);
var state = {};
var inDrag = false;
function dragStart(evt) {
if (inDrag) {
return;
}
inDrag = true;
if (eventHandler('dragstart', evt, state) !== false) {
$(document).bind('mousemove', dragUpdate);
$(document).bind('mouseup', dragEnd);
}
evt.preventDefault();
return false;
}
function dragUpdate(evt) {
if (! inDrag) {
return;
}
eventHandler('dragupdate', evt, state);
evt.preventDefault();
return false;
}
function dragEnd(evt) {
if (! inDrag) {
return;
}
inDrag = false;
try {
eventHandler('dragend', evt, state);
}
finally {
$(document).unbind('mousemove', dragUpdate);
$(document).unbind('mouseup', dragEnd);
evt.preventDefault();
}
return false;
}
node.bind('mousedown', dragStart);
});
}
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