add free mind support

kity @ 95da8132

-Subproject commit 8f52e73cc57a447f268e71783d44e34ee028f763
+Subproject commit 95da81322148afe2f03c632777148feba75e918e

src/protocol/freemind.js

@@ -88,8 +88,55 @@ KityMinder.registerProtocol('freemind', function(minder) {
             });
         },
 
-        // 不支持
-        encode: null
+        encode: function(json, km, options) {
+            var url = 'native-support/export.php';
+            var data = JSON.stringify(json);
+
+            function fetch() {
+                return new Promise(function(resolve, reject) {
+                    var xhr = new XMLHttpRequest();
+                    xhr.responseType = 'blob';
+                    xhr.onload = resolve;
+                    xhr.onerror = reject;
+                    xhr.open('POST', url);
+
+                    var form = new FormData();
+                    form.append('type', 'freemind');
+                    form.append('data', data);
+
+                    xhr.send(form);
+                }).then(function(e) {
+                    return e.target.response;
+                });
+            }
+
+            function download() {
+                var filename = options.filename || 'freemind.mm';
+
+                var form = document.createElement('form');
+                form.setAttribute('action', url);
+                form.setAttribute('method', 'POST');
+                form.appendChild(field('filename', filename));
+                form.appendChild(field('type', 'freemind'));
+                form.appendChild(field('data', data));
+                form.appendChild(field('download', '1'));
+                form.submit();
+
+                function field(name, content) {
+                    var input = document.createElement('input');
+                    input.type = 'hidden';
+                    input.name = name;
+                    input.value = content;
+                    return input;
+                }
+            }
+
+            if (options && options.download) {
+                return download();
+            } else {
+                return fetch();
+            }
+        }
     };
 
 });
\ No newline at end of file

src/protocol/xmind.js

@@ -179,6 +179,8 @@ KityMinder.registerProtocol('xmind', function(minder) {
                 }
             }
 
+            return download();
+
             if (options && options.download) {
                 return download();
             } else {

ui/menu/save/download.js

@@ -56,6 +56,8 @@ KityMinder.registerUI('menu/save/download', function(minder) {
 
         minder.exportData(protocol.name, options).then(function(data) {
 
+            if (protocol.name == 'freemind') return;
+
             switch (protocol.dataType) {
                 case 'text':
                     return doDownload(buildDataUrl(mineType, data), filename, 'text');