behavior-drag-and-drop-textarea.js
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behavior-drag-and-drop-textarea.js
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			/**
			* @provides javelin-behavior-aphront-drag-and-drop-textarea
			* @requires javelin-behavior
			* javelin-dom
			* phabricator-drag-and-drop-file-upload
			* phabricator-textareautils
			*/

			JX.behavior('aphront-drag-and-drop-textarea', function(config) {

			var target = JX.$(config.target);

			function onupload(f) {
			var text = JX.TextAreaUtils.getSelectionText(target);
			var ref = '{F' + f.getID() + '}';

			// If the user has dragged and dropped multiple files, we'll get an event
			// each time an upload completes. Rather than overwriting the first
			// reference, append the new reference if the selected text looks like an
			// existing file reference.
			if (text.match(/^\{F/)) {
			ref = text + "\n\n" + ref;
			}

			JX.TextAreaUtils.setSelectionText(target, ref);
			}

			if (JX.PhabricatorDragAndDropFileUpload.isSupported()) {
			var drop = new JX.PhabricatorDragAndDropFileUpload(target)
			.setURI(config.uri);
			drop.listen('didBeginDrag', function(e) {
			JX.DOM.alterClass(target, config.activatedClass, true);
			});
			drop.listen('didEndDrag', function(e) {
			JX.DOM.alterClass(target, config.activatedClass, false);
			});
			drop.listen('didUpload', onupload);
			drop.start();
			}

			});