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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
			* phabricator-remarkup-metadata
			*/

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

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

			if (JX.PhabricatorDragAndDropFileUpload.isSupported()) {
			var drop = new JX.PhabricatorDragAndDropFileUpload(target)
			.setURI(config.uri)
			.setChunkThreshold(config.chunkThreshold);

			drop.listen('didBeginDrag', function() {
			JX.DOM.alterClass(target, config.activatedClass, true);
			});

			drop.listen('didEndDrag', function() {
			JX.DOM.alterClass(target, config.activatedClass, false);
			});

			drop.listen('didUpload', function(file) {
			JX.TextAreaUtils.insertFileReference(target, file);

			if(config.remarkupMetadataID) {
			// Try to auto-attach files by default
			// https://we.phorge.it/T15106
			var metadata = new JX.RemarkupMetadata(config.remarkupMetadataValue,
			config.remarkupMetadataID);
			var phids = metadata.getMetadata('attachedFilePHIDs', []);
			phids.push(file.getPHID());
			metadata.setMetadata('attachedFilePHIDs', phids);
			}
			});

			drop.start();
			}

			});