From 56ef099939e422a07c960b9772af4a366a66e041 Mon Sep 17 00:00:00 2001
From: diluculo <diluculo@gmail.com>
Date: Tue, 23 Aug 2016 16:00:05 +0900
Subject: [PATCH] DropFilesBehavior Added

---
 src/Gemini/Gemini.csproj                      |   1 +
 .../Shell/Behaviors/DropFilesBehavior.cs      | 105 ++++++++++++++++++
 src/Gemini/Modules/Shell/Views/ShellView.xaml |   5 +-
 3 files changed, 110 insertions(+), 1 deletion(-)
 create mode 100644 src/Gemini/Modules/Shell/Behaviors/DropFilesBehavior.cs

diff --git a/src/Gemini/Gemini.csproj b/src/Gemini/Gemini.csproj
index f6148ae6..5cfbb94d 100644
--- a/src/Gemini/Gemini.csproj
+++ b/src/Gemini/Gemini.csproj
@@ -187,6 +187,7 @@
     <Compile Include="Modules\Settings\Views\SettingsView.xaml.cs">
       <DependentUpon>SettingsView.xaml</DependentUpon>
     </Compile>
+    <Compile Include="Modules\Shell\Behaviors\DropFilesBehavior.cs" />
     <Compile Include="Modules\Shell\Commands\ViewFullscreenCommandDefinition.cs" />
     <Compile Include="Modules\Shell\Commands\CloseFileCommandDefinition.cs" />
     <Compile Include="Modules\Shell\Commands\CloseFileCommandHandler.cs" />
diff --git a/src/Gemini/Modules/Shell/Behaviors/DropFilesBehavior.cs b/src/Gemini/Modules/Shell/Behaviors/DropFilesBehavior.cs
new file mode 100644
index 00000000..aaf2409f
--- /dev/null
+++ b/src/Gemini/Modules/Shell/Behaviors/DropFilesBehavior.cs
@@ -0,0 +1,105 @@
+using Caliburn.Micro;
+using Gemini.Framework;
+using Gemini.Framework.Commands;
+using Gemini.Framework.Services;
+using Gemini.Modules.Shell.Commands;
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Input;
+
+namespace Gemini.Modules.Shell.Behaviors
+{
+    /// <summary>
+    /// Attached behaviour to implement the drop event
+    /// source: http://social.msdn.microsoft.com/Forums/de-DE/wpf/thread/21bed380-c485-44fb-8741-f9245524d0ae
+    ///         http://stackoverflow.com/questions/1034374/drag-and-drop-in-mvvm-with-scatterview
+    /// </summary>
+    public class DropFilesBehavior : DependencyObject
+    {
+        public static readonly DependencyProperty AllowOpenProperty = DependencyProperty.RegisterAttached(
+            "AllowOpen",
+            typeof(bool),
+            typeof(DropFilesBehavior),
+            new PropertyMetadata(false, OnAllowOpenChanged));
+
+        public static bool GetAllowOpen(DependencyObject source)
+        {
+            return (bool)source.GetValue(AllowOpenProperty);
+        }
+
+        public static void SetAllowOpen(DependencyObject source, bool value)
+        {
+            source.SetValue(AllowOpenProperty, value);
+        }
+
+        private static void OnAllowOpenChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            UIElement uiElement = d as UIElement;
+            uiElement.Drop -= UIElement_Drop;
+
+            if ((bool)e.NewValue)
+            {
+                uiElement.Drop += UIElement_Drop;
+            }
+        }
+
+        private static void UIElement_Drop(object sender, DragEventArgs e)
+        {
+            UIElement uiElement = sender as UIElement;
+
+            // Sanity check just in case this was somehow send by something else
+            if (uiElement == null)
+                return;
+
+            if (e.Data.GetDataPresent(DataFormats.FileDrop))
+            {
+                string[] droppedFilePaths = e.Data.GetData(DataFormats.FileDrop, true) as string[];
+                Task.Run(() => OpenDocument(droppedFilePaths));
+            }
+        }
+
+        public static async Task OpenDocument(string[] droppedFilePaths)
+        {
+            var shell = IoC.Get<IShell>();
+            var providers = IoC.GetAllInstances(typeof(IEditorProvider)).Cast<IEditorProvider>();
+
+            foreach (var newPath in droppedFilePaths)
+            {
+                // Check if file type is supprted
+                if (providers.FirstOrDefault(p => p.Handles(newPath)) == null)
+                    continue;
+
+                // Check if the document is already open
+                bool foundInShell = false;
+                foreach (var document in shell.Documents.OfType<PersistedDocument>().Where(d => !d.IsNew))
+                {
+                    if (string.IsNullOrEmpty(document.FilePath))
+                        continue;
+
+                    var docPath = Path.GetFullPath(document.FilePath);
+                    if (string.Equals(newPath, docPath, System.StringComparison.OrdinalIgnoreCase))
+                    {
+                        shell.OpenDocument(document);
+                        foundInShell = true;
+                        break;
+                    }
+                }
+
+                if (!foundInShell)
+                {
+                    shell.OpenDocument(await OpenFileCommandHandler.GetEditor(newPath));
+
+                    // Add the file to the recent documents list
+                    //shell.RecentFiles.Update(newPath);
+                }
+            }
+        }
+
+    }
+}
diff --git a/src/Gemini/Modules/Shell/Views/ShellView.xaml b/src/Gemini/Modules/Shell/Views/ShellView.xaml
index d2bd5b79..77079d34 100644
--- a/src/Gemini/Modules/Shell/Views/ShellView.xaml
+++ b/src/Gemini/Modules/Shell/Views/ShellView.xaml
@@ -6,6 +6,7 @@
 			 xmlns:xcad="http://schemas.xceed.com/wpf/xaml/avalondock"
 			 xmlns:converters="clr-namespace:Gemini.Modules.Shell.Converters"
              xmlns:toolbarcontrols="clr-namespace:Gemini.Modules.ToolBars.Controls"
+             xmlns:b="clr-namespace:Gemini.Modules.Shell.Behaviors"
 			 xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
 			 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
              mc:Ignorable="d" 
@@ -28,7 +29,9 @@
         <xcad:DockingManager x:Name="Manager" DocumentsSource="{Binding Items}"
 							 AnchorablesSource="{Binding Tools}"
 							 ActiveContent="{Binding ActiveLayoutItem, Mode=TwoWay}"
-                             LayoutUpdated="OnManagerLayoutUpdated">
+                             LayoutUpdated="OnManagerLayoutUpdated"
+                             b:DropFilesBehavior.AllowOpen="True"
+                             AllowDrop="True">
             <xcad:DockingManager.LayoutItemTemplateSelector>
                 <controls:PanesTemplateSelector>
                     <controls:PanesTemplateSelector.DocumentTemplate>