changed to file event instead of property change listening

UserEventData.m

@@ -0,0 +1,11 @@
+classdef (ConstructOnLoad) UserEventData < event.EventData
+   properties
+       userdata
+   end
+
+   methods
+      function data = UserEventData(userdata)
+         data.userdata = userdata;
+      end
+   end
+end

WidgetFolderBrowser.m

@@ -9,19 +9,17 @@
 % Max-Planck Institute For Brain Research
 %
 
-    properties (SetObservable = true)
-
-        file
-
-    end
-
     properties (Access = private)
 
         ui
         model
 
     end
 
+    events
+        event_newFile
+    end
+
 
     methods
 
@@ -51,6 +49,8 @@
             addlistener(obj.ui, 'event_filePrevious', @obj.fcnCallback_filePrevious);
             addlistener(obj.ui, 'event_folderLoad', @obj.fcnCallback_folderLoad);
 
+            addlistener(obj.model, 'event_newFile', @obj.fcnCallback_requestNewFile);
+
         end
     end
 
@@ -60,43 +60,40 @@
         function obj = fcnCallback_fileLoad(obj, ~, ~)
 
             obj.model.fileLoad();
-            obj.requestNewFile();
 
         end
 
         %% @ ui event_fileNext
         function obj = fcnCallback_fileNext(obj, ~, ~)
 
             obj.model.fileUpdate(1);
-            obj.requestNewFile();
 
         end
 
         %% @ ui event_filePrevious
         function obj = fcnCallback_filePrevious(obj, ~, ~)
 
             obj.model.fileUpdate(-1);
-            obj.requestNewFile();
 
         end
 
         %% @ ui event_folderLoad
         function obj = fcnCallback_folderLoad(obj, ~, ~)
 
             obj.model.folderLoad();
-            obj.requestNewFile();
 
         end
 
         %% @ request newfile
-        function obj = requestNewFile(obj)
-            
+        function obj = fcnCallback_requestNewFile(obj, ~, event)
+
             obj.ui.updateFileName(obj.model.fileTag);
             obj.ui.updateFileCounter(obj.model.index, obj.model.listSize);
-            obj.file = obj.model.file();
 
+            userEventData = UserEventData(event.userdata);
+            notify(obj, 'event_newFile', userEventData);
         end
 
     end
 
-end
+end

WidgetFolderBrowserModel.m

@@ -18,12 +18,15 @@
     end
 
     properties (Dependent)
-
-        listSize
-        fileTag
         file
-
+        listSize
+        fileTag        
+    end
+
+    events
+        event_newFile
     end
+
 
     methods
 
@@ -33,15 +36,25 @@
 
         end
 
-        function obj = fileLoad(obj)
+        function obj = fileLoad(varargin)
+
+            if nargin==1
+                obj = varargin{1};
+                [fileName, pathName] = uigetfile(regexp(obj.extension, ',', 'split')', 'Pick a file ...');
+                obj.path = pathName(1:end-1); % uigetfile returns pathName with filesep
+            elseif nargin==2 && exist(varargin{2}, 'file') %valid file as second argument
+                [pathstr, name, ext] = fileparts(varargin{2});
+                fileName = [name, ext];
+                obj.path = pathstr;
+            else
+                error('Wrong number of input arguments');
+            end
 
-            [fileName, pathName] = uigetfile(regexp(obj.extension, ',', 'split')', 'Pick a file ...');
             if ischar(fileName)
-
-                obj.path = pathName(1:end-1); % uigetfile retunrns pathName with filesep
                 obj.list = {[pathName, fileName]};
                 obj.index = 1;
-
+                userEventData = UserEventData([pathName, fileName]);
+                notify(obj, 'event_newFile', userEventData);
             end
 
         end