Improve support for drag and drop

Documentation TBD

core/modules/utils/dom/datatransfer.js

@@ -0,0 +1,94 @@
+/*\
+title: $:/core/modules/utils/dom/datatransfer.js
+type: application/javascript
+module-type: utils
+
+Browser data transfer utilities, used with the clipboard and drag and drop
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+exports.importDataTransfer = function(dataTransfer,fallbackTitle,callback) {
+	// Try each provided data type in turn
+	for(var t=0; t<importDataTypes.length; t++) {
+		if(!$tw.browser.isIE || importDataTypes[t].IECompatible) {
+			// Get the data
+			var dataType = importDataTypes[t];
+				var data = dataTransfer.getData(dataType.type);
+			// Import the tiddlers in the data
+			if(data !== "" && data !== null) {
+				if($tw.log.IMPORT) {
+					console.log("Importing data type '" + dataType.type + "', data: '" + data + "'")
+				}
+				var tiddlerFields = dataType.toTiddlerFieldsArray(data,fallbackTitle);
+				callback(tiddlerFields);
+				return;
+			}
+		}
+	}
+};
+
+var importDataTypes = [
+	{type: "text/vnd.tiddler", IECompatible: false, toTiddlerFieldsArray: function(data,fallbackTitle) {
+		return parseJSONTiddlers(data,fallbackTitle);
+	}},
+	{type: "URL", IECompatible: true, toTiddlerFieldsArray: function(data,fallbackTitle) {
+		// Check for tiddler data URI
+		var match = decodeURIComponent(data).match(/^data\:text\/vnd\.tiddler,(.*)/i);
+		if(match) {
+			return parseJSONTiddlers(match[1],fallbackTitle);
+		} else {
+			return { // As URL string
+				text: data
+			};
+		}
+	}},
+	{type: "text/x-moz-url", IECompatible: false, toTiddlerFieldsArray: function(data,fallbackTitle) {
+		// Check for tiddler data URI
+		var match = decodeURIComponent(data).match(/^data\:text\/vnd\.tiddler,(.*)/i);
+		if(match) {
+			return parseJSONTiddlers(match[1],fallbackTitle);
+		} else {
+			return { // As URL string
+				text: data
+			};
+		}
+	}},
+	{type: "text/html", IECompatible: false, toTiddlerFieldsArray: function(data,fallbackTitle) {
+		return {
+			text: data
+		};
+	}},
+	{type: "text/plain", IECompatible: false, toTiddlerFieldsArray: function(data,fallbackTitle) {
+		return {
+			text: data
+		};
+	}},
+	{type: "Text", IECompatible: true, toTiddlerFieldsArray: function(data,fallbackTitle) {
+		return {
+			text: data
+		};
+	}},
+	{type: "text/uri-list", IECompatible: false, toTiddlerFieldsArray: function(data,fallbackTitle) {
+		return {
+			text: data
+		};
+	}}
+];
+
+function parseJSONTiddlers(json,fallbackTitle) {
+	var data = JSON.parse(json);
+	if(!$tw.utils.isArray(data)) {
+		data = [data];
+	}
+	data.forEach(function(fields) {
+		fields.title = fields.title || fallbackTitle;
+	});
+	return data;
+};
+
+})();