implemented duplicate file actions dialog.

GUI/GarOperation.cs

@@ -0,0 +1,115 @@
+//! \file       GarOperation.cs
+//! \date       Fri Feb 03 19:06:52 2017
+//! \brief      Base class for GARbro file operation.
+//
+// Copyright (C) 2017 by morkt
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+
+using System;
+using System.IO;
+using GARbro.GUI.Strings;
+
+namespace GARbro.GUI
+{
+    internal class GarOperation
+    {
+        internal MainWindow             m_main;
+        internal ProgressDialog         m_progress_dialog;
+        internal Exception              m_pending_error;
+        internal FileExistsDialogResult m_duplicate_action;
+        internal string                 m_title;
+
+        const int MaxRenameAttempts = 100;
+
+        protected GarOperation (MainWindow parent, string dialog_title)
+        {
+            m_main = parent;
+            m_title = dialog_title;
+        }
+
+        protected Stream CreateNewFile (string filename)
+        {
+            FileMode open_mode = FileMode.CreateNew;
+            if (m_duplicate_action.ApplyToAll &&
+                m_duplicate_action.Action == ExistingFileAction.Overwrite)
+                open_mode = FileMode.Create;
+            try
+            {
+                return File.Open (filename, open_mode);
+            }
+            catch (IOException) // file already exists?
+            {
+                if (!File.Exists (filename) || FileMode.Create == open_mode) // some unforseen I/O error, give up
+                    throw;
+            }
+            if (!m_duplicate_action.ApplyToAll)
+            {
+                var msg_text = string.Format (guiStrings.TextFileAlreadyExists, Path.GetFileName (filename));
+                m_duplicate_action = m_main.Dispatcher.Invoke (() => m_main.ShowFileExistsDialog (m_title, msg_text, m_progress_dialog.GetWindowHandle()));
+            }
+            switch (m_duplicate_action.Action)
+            {
+            default:
+            case ExistingFileAction.Abort:
+                throw new OperationCanceledException();
+            case ExistingFileAction.Skip:
+                throw new SkipExistingFileException();
+            case ExistingFileAction.Rename:
+                return CreateRenamedFile (filename);
+            case ExistingFileAction.Overwrite:
+                return File.Open (filename, FileMode.Create);
+            }
+        }
+
+        /// <summary>
+        /// Creates new file with specified filename, or, if it's already exists, tries to open
+        /// files named "FILENAME.1.EXT", "FILENAME.2.EXT" and so on.
+        /// <exception cref="System.IOException">Throws exception after 100th failed attempt.</exception>
+        /// </summary>
+
+        public static Stream CreateRenamedFile (string filename)
+        {
+            var ext = Path.GetExtension (filename);
+            for (int attempt = 1; ; ++attempt)
+            {
+                var name = Path.ChangeExtension (filename, attempt.ToString()+ext);
+                try
+                {
+                    return File.Open (name, FileMode.CreateNew);
+                }
+                catch (IOException) // file already exists
+                {
+                    if (MaxRenameAttempts == attempt) // limit number of attempts
+                        throw;
+                }
+            }
+        }
+
+        protected FileErrorDialogResult ShowErrorDialog (string error_text)
+        {
+            return m_main.Dispatcher.Invoke (() => m_main.ShowErrorDialog (m_title, error_text, m_progress_dialog.GetWindowHandle()));
+        }
+    }
+
+    internal class SkipExistingFileException : ApplicationException
+    {
+    }
+}