handle ENTER key and refactoring invoke routine

QuickLook/BackgroundListener.cs

@@ -11,7 +11,7 @@ namespace QuickLook
 
         protected BackgroundListener()
         {
-            InstallHook(HotkeyEventHandler);
+            InstallKeyHook(HotkeyEventHandler);
         }
 
         public void Dispose()
@@ -27,18 +27,19 @@ namespace QuickLook
             ViewWindowManager.GetInstance().InvokeRoutine(e.KeyCode);
         }
 
-        private void InstallHook(KeyEventHandler handler)
+        private void InstallKeyHook(KeyEventHandler handler)
         {
             _hook = GlobalKeyboardHook.GetInstance();
 
-            _hook.HookedKeys.Add(Keys.Space);
+            _hook.HookedDownKeys.Add(Keys.Enter);
-            //_hook.HookedKeys.Add(Keys.Enter);
+            _hook.KeyDown += handler;
-
-            _hook.HookedKeys.Add(Keys.Up);
-            _hook.HookedKeys.Add(Keys.Down);
-            _hook.HookedKeys.Add(Keys.Left);
-            _hook.HookedKeys.Add(Keys.Right);
 
+            _hook.HookedUpKeys.Add(Keys.Space);
+            _hook.HookedUpKeys.Add(Keys.Escape);
+            _hook.HookedUpKeys.Add(Keys.Up);
+            _hook.HookedUpKeys.Add(Keys.Down);
+            _hook.HookedUpKeys.Add(Keys.Left);
+            _hook.HookedUpKeys.Add(Keys.Right);
             _hook.KeyUp += handler;
         }
 

QuickLook/GlobalKeyboardHook.cs

@@ -14,7 +14,8 @@ namespace QuickLook
 
         private User32.KeyboardHookProc _callback;
         private IntPtr _hhook = IntPtr.Zero;
-        internal List<Keys> HookedKeys = new List<Keys>();
+        internal List<Keys> HookedDownKeys = new List<Keys>();
+        internal List<Keys> HookedUpKeys = new List<Keys>();
 
         protected GlobalKeyboardHook()
         {
@@ -63,13 +64,21 @@ namespace QuickLook
             if (code >= 0)
             {
                 var key = (Keys) lParam.vkCode;
-                if (HookedKeys.Contains(key))
+                if (HookedDownKeys.Contains(key))
                 {
                     key = AddModifiers(key);
 
                     var kea = new KeyEventArgs(key);
                     if (wParam == User32.WM_KEYDOWN || wParam == User32.WM_SYSKEYDOWN)
                         KeyDown?.Invoke(this, kea);
+                    if (kea.Handled)
+                        return 1;
+                }
+                else if (HookedUpKeys.Contains(key))
+                {
+                    key = AddModifiers(key);
+
+                    var kea = new KeyEventArgs(key);
                     if (wParam == User32.WM_KEYUP || wParam == User32.WM_SYSKEYUP)
                         KeyUp?.Invoke(this, kea);
                     if (kea.Handled)

QuickLook/Helpers/FileHelper.cs

@@ -2,6 +2,7 @@
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.IO;
+using System.Linq;
 using System.Runtime.InteropServices;
 using System.Text;
 using QuickLook.NativeMethods;
@@ -20,9 +21,8 @@ namespace QuickLook.Helpers
             return ret[0];
         }
 
-        public static bool? GetAssocApplication(string path, out string executePath, out string appFriendlyName)
+        public static bool? GetAssocApplication(string path, out string appFriendlyName)
         {
-            executePath = string.Empty;
             appFriendlyName = string.Empty;
 
             if (string.IsNullOrEmpty(path))
@@ -42,14 +42,13 @@ namespace QuickLook.Helpers
             }
 
             var ext = Path.GetExtension(path).ToLower();
-            var isExe = ext.ToLower() == ".exe";
+            var isExe = new[] {".cmd", ".bat", ".pif", ".scf", ".exe", ".com", ".scr"}.Contains(ext.ToLower());
 
             // no assoc. app. found
             if (string.IsNullOrEmpty(GetAssocApplicationNative(ext, AssocStr.Command)))
                 if (string.IsNullOrEmpty(GetAssocApplicationNative(ext, AssocStr.AppId))) // UWP
                     return null;
 
-            executePath = path;
             appFriendlyName = isExe
                 ? FileVersionInfo.GetVersionInfo(path).FileDescription
                 : GetAssocApplicationNative(ext, AssocStr.FriendlyAppName);

QuickLook/MainWindowTransparent.xaml

@@ -75,7 +75,8 @@
                     </Grid>
                 </DockPanel>
                 <Grid>
-                    <ContentControl x:Name="container" />
+                    <ContentControl x:Name="container"
+                                    Content="{Binding ContextObject.ViewerContent, ElementName=mainWindow}" />
                 </Grid>
             </DockPanel>
             <Grid x:Name="busyIndicatorLayer">

QuickLook/MainWindowTransparent.xaml.cs

@@ -15,6 +15,7 @@ namespace QuickLook
     public partial class MainWindowTransparent : Window
     {
         private string _path = string.Empty;
+        private IViewer _plugin;
 
         internal MainWindowTransparent()
         {
@@ -33,7 +34,7 @@ namespace QuickLook
                     BlurWindow.EnableWindowBlur(this);
             };
 
-            buttonCloseWindow.MouseLeftButtonUp += (sender, e) => BeginHide(true);
+            buttonCloseWindow.MouseLeftButtonUp += (sender, e) => BeginHide();
 
             /*PreviewKeyUp += (sender, e) =>
             {
@@ -46,13 +47,16 @@ namespace QuickLook
 
         public ContextObject ContextObject { get; private set; }
 
-        private void OpenWithAssocApp()
+        internal void OpenWithAssocApp()
         {
             if (string.IsNullOrEmpty(_path))
                 return;
 
-            Process.Start(new ProcessStartInfo(_path) {WorkingDirectory = Path.GetDirectoryName(_path)});
+            Process.Start(new ProcessStartInfo(_path)
-            BeginHide(true);
+            {
+                WorkingDirectory = Path.GetDirectoryName(_path)
+            });
+            BeginHide();
         }
 
         private void ResizeAndCenter(Size size)
@@ -79,22 +83,26 @@ namespace QuickLook
 
         internal void UnloadPlugin()
         {
-            container.Content = null;
+            // clear ref to control
+            //container.Content = null;
 
-            // clean up plugin and refresh ContextObject for next use
+            ContextObject.Reset();
-            ContextObject.ViewerPlugin?.Cleanup();
+
+            _plugin?.Cleanup();
+            _plugin = null;
+
+            GC.Collect();
         }
 
         internal void BeginShow(IViewer matchedPlugin, string path)
         {
-            ContextObject.CurrentContentContainer = container;
+            _path = path;
-            ContextObject.ViewerPlugin = matchedPlugin;
+            _plugin = matchedPlugin;
-            ContextObject.ViewerWindow = this;
 
             // get window size before showing it
-            ContextObject.ViewerPlugin.Prepare(path, ContextObject);
+            _plugin.Prepare(path, ContextObject);
 
-            SetOpenWithButtonAndPath(path);
+            SetOpenWithButtonAndPath();
 
             // revert UI changes
             ContextObject.IsBusy = true;
@@ -116,7 +124,7 @@ namespace QuickLook
                 {
                     try
                     {
-                        ContextObject.ViewerPlugin.View(path, ContextObject);
+                        _plugin.View(path, ContextObject);
                     }
                     catch (Exception e)
                     {
@@ -129,40 +137,23 @@ namespace QuickLook
                 throw thrown;
         }
 
-        private void SetOpenWithButtonAndPath(string path)
+        private void SetOpenWithButtonAndPath()
         {
-            var isExe = FileHelper.GetAssocApplication(path, out string executePath, out string appFriendlyName);
+            var isExe = FileHelper.GetAssocApplication(_path, out string appFriendlyName);
 
-            _path = executePath;
+            buttonOpenWith.Content = isExe == null
-            buttonOpenWith.Visibility = isExe == null ? Visibility.Collapsed : Visibility.Visible;
+                ? Directory.Exists(_path)
-            buttonOpenWith.Content = isExe == true ? $"Run {appFriendlyName}" : $"Open with {appFriendlyName}";
+                    ? $"Browse “{Path.GetFileName(_path)}”"
+                    : "Select ..."
+                : isExe == true
+                    ? $"Run “{appFriendlyName}”"
+                    : $"Open with “{appFriendlyName}”";
         }
 
-        internal bool BeginHide(bool quitIfViewer = false, bool disposePluginOnly = false)
+        internal void BeginHide()
         {
-            if (quitIfViewer && App.RunningAsViewer)
-            {
-                Application.Current.Shutdown();
-                return true;
-            }
-
-            if (Visibility != Visibility.Visible)
-                return false;
-
             UnloadPlugin();
-            ContextObject.Reset();
+            Hide();
-            GC.Collect();
-
-            // revert UI changes
-            ContextObject.IsBusy = true;
-
-            if (!disposePluginOnly)
-            {
-                Hide();
-                return true;
-            }
-
-            return false;
         }
     }
 }

QuickLook/Plugin/ContextObject.cs

@@ -2,7 +2,6 @@
 using System.ComponentModel;
 using System.Runtime.CompilerServices;
 using System.Windows;
-using System.Windows.Controls;
 using QuickLook.Annotations;
 using QuickLook.Helpers;
 
@@ -18,8 +17,7 @@ namespace QuickLook.Plugin
 
         private bool _isBusy = true;
         private string _title = "";
-        internal ContentControl CurrentContentContainer;
+        private object _viewerContent;
-        internal IViewer ViewerPlugin;
 
         /// <summary>
         ///     Get the viewer window.
@@ -44,8 +42,12 @@ namespace QuickLook.Plugin
         /// </summary>
         public object ViewerContent
         {
-            get => CurrentContentContainer.Content;
+            get => _viewerContent;
-            set => CurrentContentContainer.Content = value;
+            set
+            {
+                _viewerContent = value;
+                OnPropertyChanged();
+            }
         }
 
         /// <summary>
@@ -94,12 +96,6 @@ namespace QuickLook.Plugin
 
         public event PropertyChangedEventHandler PropertyChanged;
 
-        public void DisposePlugin()
-        {
-            ViewerPlugin?.Cleanup();
-            ViewerPlugin = null;
-        }
-
         /// <summary>
         ///     Show a notification balloon.
         /// </summary>

QuickLook/ViewWindowManager.cs

@@ -29,23 +29,58 @@ namespace QuickLook
 
         internal void InvokeRoutine(Keys key)
         {
-            // do we need switch to another file?
+            Debug.WriteLine(key);
-            var replaceView = key == Keys.Up || key == Keys.Down || key == Keys.Left || key == Keys.Right;
 
-            if (replaceView && _currentMainWindow.Visibility != Visibility.Visible)
+            switch (key)
+            {
+                case Keys.Up:
+                case Keys.Down:
+                case Keys.Left:
+                case Keys.Right:
+                    SwitchPreviewToAnotherFile();
+                    break;
+                case Keys.Space:
+                    TogglePreview();
+                    break;
+                case Keys.Escape:
+                case Keys.Enter:
+                    ClosePreview();
+                    break;
+                default:
+                    break;
+            }
+        }
+
+        private void ClosePreview()
+        {
+            if (!WindowHelper.IsFocusedControlExplorerItem() && !WindowHelper.IsFocusedWindowSelf())
+                return;
+
+            if (_currentMainWindow.Visibility == Visibility.Visible)
+                _currentMainWindow.BeginHide();
+        }
+
+        private void TogglePreview()
+        {
+            if (!WindowHelper.IsFocusedControlExplorerItem() && !WindowHelper.IsFocusedWindowSelf())
+                return;
+
+            if (_currentMainWindow.Visibility == Visibility.Visible)
+                _currentMainWindow.BeginHide();
+            else
+                InvokeViewer(GetCurrentSelection());
+        }
+
+        private void SwitchPreviewToAnotherFile()
+        {
+            if (_currentMainWindow.Visibility != Visibility.Visible)
                 return;
 
             if (!WindowHelper.IsFocusedControlExplorerItem())
-                if (replaceView || !WindowHelper.IsFocusedWindowSelf())
-                    return;
-
-            // should the window be closed (replaceView == false), return without showing new one
-            if (_currentMainWindow.BeginHide(disposePluginOnly: replaceView))
                 return;
 
-            var path = GetCurrentSelection();
+            _currentMainWindow.UnloadPlugin();
-
+            InvokeViewer(GetCurrentSelection());
-            InvokeViewer(path);
         }
 
         internal void InvokeViewer(string path)