Implement import and export of Settings.

- NEU: Stile können importiert und exportiert werden.

zaaReloaded2/ViewModels/IoErrorViewModel.cs

@@ -0,0 +1,46 @@
+/* IoErrorViewModel.cs
+ * part of zaaReloaded2
+ * 
+ * Copyright 2015 Daniel Kraus
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Bovender.Mvvm.ViewModels;
+
+namespace zaaReloaded2.ViewModels
+{
+    /// <summary>
+    /// Simple view model for I/O error messages, for use in conjunction
+    /// with Bovender's ShowViewDialogAction and zaaReloaded2.Views.IoErrorView.
+    /// </summary>
+    class IoErrorViewModel : ViewModelBase
+    {
+        public Exception Exception { get; private set; }
+
+        public string Message { get { return Exception.Message; } }
+
+        public IoErrorViewModel(Exception e)
+        {
+            Exception = e;
+        }
+
+        public override object RevealModelObject()
+        {
+            return Exception;
+        }
+    }
+}

zaaReloaded2/ViewModels/SettingsRepositoryViewModel.cs

@@ -24,6 +24,8 @@ using Bovender.Mvvm.ViewModels;
 using Bovender.Mvvm.Messaging;
 using zaaReloaded2.Controller;
 using System.Collections.ObjectModel;
+using System.Runtime.Serialization.Formatters.Soap;
+using System.IO;
 
 namespace zaaReloaded2.ViewModels
 {
@@ -134,6 +136,33 @@ namespace zaaReloaded2.ViewModels
             }
         }
 
+        public DelegatingCommand ExportSettingsCommand
+        {
+            get
+            {
+                if (_exportSettingsCommand == null)
+                {
+                    _exportSettingsCommand = new DelegatingCommand(
+                        param => DoExportSettings(),
+                        param => CanExportSettings());
+                }
+                return _exportSettingsCommand;
+            }
+        }
+        public DelegatingCommand ImportSettingsCommand
+        {
+            get
+            {
+                if (_importSettingsCommand == null)
+                {
+                    _importSettingsCommand = new DelegatingCommand(
+                        param => DoImportSettings(),
+                        param => CanImportSettings());
+                }
+                return _importSettingsCommand;
+            }
+        }
+
         #endregion
 
         #region Messages
@@ -186,6 +215,54 @@ namespace zaaReloaded2.ViewModels
             }
         }
 
+        public Message<FileNameMessageContent> ChooseExportFileNameMessage
+        {
+            get
+            {
+                if (_chooseExportFileNameMessage == null)
+                {
+                    _chooseExportFileNameMessage = new Message<FileNameMessageContent>();
+                }
+                return _chooseExportFileNameMessage;
+            }
+        }
+
+        public Message<FileNameMessageContent> ChooseImportFileNameMessage
+        {
+            get
+            {
+                if (_chooseImportFileNameMessage == null)
+                {
+                    _chooseImportFileNameMessage = new Message<FileNameMessageContent>();
+                }
+                return _chooseImportFileNameMessage;
+            }
+        }
+
+        public Message<ViewModelMessageContent> ExportErrorMessage
+        {
+            get
+            {
+                if (_exportErrorMessage == null)
+                {
+                    _exportErrorMessage = new Message<ViewModelMessageContent>();
+                }
+                return _exportErrorMessage;
+            }
+        }
+
+        public Message<ViewModelMessageContent> ImportErrorMessage
+        {
+            get
+            {
+                if (_importErrorMessage == null)
+                {
+                    _importErrorMessage = new Message<ViewModelMessageContent>();
+                }
+                return _importErrorMessage;
+            }
+        }
+
         #endregion
 
         #region Constructors
@@ -334,6 +411,86 @@ namespace zaaReloaded2.ViewModels
             SettingsList.Add(settingsViewModel);
         }
 
+        void DoExportSettings()
+        {
+            if (CanExportSettings())
+            {
+                ChooseExportFileNameMessage.Send(
+                    new FileNameMessageContent(SuggestImportExportPath(), FILE_FILTER),
+                    msg => ConfirmExportSettings(msg));
+            }
+        }
+
+        bool CanExportSettings()
+        {
+            return LastSelected != null && LastSelected.IsSelected && !IsDefaultSettings();
+        }
+
+        void ConfirmExportSettings(FileNameMessageContent message)
+        {
+            if (message.Confirmed)
+            {
+                Properties.Settings.Default.ImportExportPath = message.Value;
+                Properties.Settings.Default.Save();
+                Settings settings = LastSelected.RevealModelObject() as Settings;
+                try
+                {
+                 settings.SaveToFile(message.Value);
+                }
+                catch (Exception e)
+                {
+                    ExportErrorMessage.Send(
+                        new ViewModelMessageContent(new IoErrorViewModel(e))
+                    );
+                }
+            }
+        }
+
+        void DoImportSettings()
+        {
+            ChooseImportFileNameMessage.Send(
+                new FileNameMessageContent(SuggestImportExportPath(), FILE_FILTER),
+                msg => ConfirmImportSettings(msg));
+        }
+
+        bool CanImportSettings()
+        {
+            return true;
+        }
+
+        void ConfirmImportSettings(FileNameMessageContent message)
+        {
+            if (message.Confirmed)
+            {
+                Properties.Settings.Default.ImportExportPath = message.Value;
+                Properties.Settings.Default.Save();
+                try
+                {
+                    Settings settings = Settings.LoadFromFile(message.Value);
+                    AddSettingsViewModel(new SettingsViewModel(settings));
+                }
+                catch (Exception e)
+                {
+                    ImportErrorMessage.Send(
+                        new ViewModelMessageContent(new IoErrorViewModel(e))
+                    );
+                }
+            }
+        }
+
+        string SuggestImportExportPath()
+        {
+            string path = Properties.Settings.Default.ImportExportPath;
+            if (String.IsNullOrEmpty(path))
+            {
+                return Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
+            }
+            else
+            {
+                return path;
+            }
+        }
+
         #endregion
 
         #region Implementation of ViewModelBase
@@ -354,10 +511,26 @@ namespace zaaReloaded2.ViewModels
         DelegatingCommand _deleteSettingsCommand;
         DelegatingCommand _resetSettingsCommand;
         DelegatingCommand _copySettingsCommand;
+        DelegatingCommand _exportSettingsCommand;
+        DelegatingCommand _importSettingsCommand;
         Message<ViewModelMessageContent> _confirmDeleteSettingsMessage;
         Message<ViewModelMessageContent> _confirmResetSettingsMessage;
         Message<ViewModelMessageContent> _editSettingsMessage;
         Message<ViewModelMessageContent> _useSettingsMessage;
+        Message<FileNameMessageContent> _chooseExportFileNameMessage;
+        Message<FileNameMessageContent> _chooseImportFileNameMessage;
+        Message<ViewModelMessageContent> _exportErrorMessage;
+        Message<ViewModelMessageContent> _importErrorMessage;
+
+        #endregion
+
+        #region Constant
+
+        /// <summary>
+        /// File filter that is used for the import and export
+        /// of settings.
+        /// </summary>
+        const string FILE_FILTER = "zaaReloaded-Stildatei (*.zaaReloaded)|*.zaaReloaded";
 
         #endregion
     }