Mooore aggressive GC; rewrite native dll

QuickLook.Native.Shell32/QuickLook.Native.Shell32.cpp

@@ -5,22 +5,12 @@
 
 #define EXPORT extern "C" __declspec(dllexport)
 
-EXPORT int GetFocusedWindowType()
+EXPORT Shell32::FocusedWindowType GetFocusedWindowType()
 {
 	return Shell32::GetFocusedWindowType();
 }
 
-EXPORT void SaveCurrentSelection()
+EXPORT void GetCurrentSelection(PWCHAR buffer)
 {
-	Shell32::SaveCurrentSelection();
+	Shell32::GetCurrentSelection(buffer);
-}
-
-EXPORT int GetCurrentSelectionCount()
-{
-	return Shell32::GetCurrentSelectionCount();
-}
-
-EXPORT void GetCurrentSelectionBuffer(PWCHAR buffer)
-{
-	Shell32::GetCurrentSelectionBuffer(buffer);
 }

QuickLook.Native.Shell32/Shell32.cpp

@@ -1,201 +1,19 @@
 #include "stdafx.h"
 
 #include "Shell32.h"
+#include <atlcomcli.h>
 
 using namespace std;
 
-vector<wstring> Shell32::vector_items;
-
-void Shell32::SaveCurrentSelection()
-{
-	vector_items.clear();
-
-	switch (GetFocusedWindowType())
-	{
-	case EXPLORER:
-		SaveSelectedFromExplorer();
-		break;
-	case DESKTOP:
-		SaveSelectedFromDesktop();
-		break;
-	default:
-		break;
-	}
-}
-
-UINT Shell32::GetCurrentSelectionCount()
-{
-	return vector_items.size();
-}
-
-void Shell32::GetCurrentSelectionBuffer(PWCHAR buffer)
-{
-	PWCHAR pos = buffer;
-
-	for (vector<wstring>::iterator it = vector_items.begin(); it < vector_items.end(); ++it)
-	{
-		int l = it->length();
-		wcscpy_s(pos, l + 1, it->c_str());
-
-		pos += l;
-
-		// overwrite NULL
-		wcscpy_s(pos++, 2, L"|");
-	}
-
-	// remove last "|"
-	wcscpy_s(pos - 1, 1, L"");
-}
-
-void Shell32::SaveSelectedFromExplorer()
-{
-	CoInitialize(nullptr);
-
-	CComPtr<IShellWindows> psw;
-	HRESULT ret = psw.CoCreateInstance(CLSID_ShellWindows);
-
-	auto hwndFGW = GetForegroundWindow();
-
-	auto fFound = FALSE;
-
-	for (int i = 0; !fFound; i++)
-	{
-		VARIANT vi;
-		V_VT(&vi) = VT_I4;
-		V_I4(&vi) = i;
-
-		CComPtr<IDispatch> pdisp;
-		// ReSharper disable once CppSomeObjectMembersMightNotBeInitialized
-		if (SUCCEEDED(psw->Item(vi, &pdisp)))
-		{
-			CComPtr<IWebBrowserApp> pwba;
-			if (SUCCEEDED(pdisp->QueryInterface(IID_IWebBrowserApp, reinterpret_cast<void**>(&pwba))))
-			{
-				HWND hwndWBA;
-				if (SUCCEEDED(pwba->get_HWND(reinterpret_cast<LONG_PTR*>(&hwndWBA))) && hwndWBA == hwndFGW)
-				{
-					fFound = TRUE;
-
-					CComPtr<IDispatch> ppdisp;
-					if (SUCCEEDED(pwba->get_Document(&ppdisp)))
-					{
-						CComPtr<IShellFolderViewDual2> pshvd;
-						if (SUCCEEDED(ppdisp->QueryInterface(IID_IShellFolderViewDual2, reinterpret_cast<void**>(&pshvd))))
-						{
-							CComPtr<FolderItems> pfis;
-							if (SUCCEEDED(pshvd->SelectedItems(&pfis)))
-							{
-								LONG pCount = 0L;
-								pfis->get_Count(&pCount);
-
-								for (int ii = 0; ii < pCount; ii++)
-								{
-									VARIANT vii;
-									V_VT(&vii) = VT_I4;
-									V_I4(&vii) = ii;
-
-									CComPtr<FolderItem> pfi;
-									// ReSharper disable once CppSomeObjectMembersMightNotBeInitialized
-									if (SUCCEEDED(pfis->Item(vii, &pfi)))
-									{
-										CComBSTR pbs = SysAllocStringLen(L"", MAX_PATH);
-										pfi->get_Path(&pbs);
-
-										wstring ws = wstring(pbs);
-										ws.shrink_to_fit();
-
-										vector_items.push_back(ws);
-									}
-								}
-							}
-						}
-					}
-				}
-			}
-		}
-	}
-}
-
-CComQIPtr<IWebBrowser2> Shell32::AttachDesktopShellWindow()
-{
-	CoInitialize(nullptr);
-
-	CComPtr<IShellWindows> psw;
-	CComQIPtr<IWebBrowser2> pdispOut;
-
-	if (SUCCEEDED(psw.CoCreateInstance(CLSID_ShellWindows)))
-	{
-		VARIANT pvarLoc = {VT_EMPTY};
-		long phwnd;
-		psw->FindWindowSW(&pvarLoc, &pvarLoc, SWC_DESKTOP, &phwnd, SWFO_NEEDDISPATCH, reinterpret_cast<IDispatch**>(&pdispOut));
-	}
-	return pdispOut;
-}
-
-void Shell32::SaveSelectedFromDesktop()
-{
-	auto pWebBrowser2 = AttachDesktopShellWindow();
-
-	if (!pWebBrowser2)
-		return;
-
-	CComQIPtr<IServiceProvider> psp(pWebBrowser2);
-
-	if (!psp) return;
-
-	CComPtr<IShellBrowser> psb;
-	if (SUCCEEDED(psp->QueryService(SID_STopLevelBrowser, IID_IShellBrowser, reinterpret_cast<LPVOID*>(&psb))))
-	{
-		CComPtr<IShellView> psv;
-		if (SUCCEEDED(psb->QueryActiveShellView(&psv)))
-		{
-			CComPtr<IFolderView> pfv;
-			if (SUCCEEDED(psv->QueryInterface(IID_IFolderView, reinterpret_cast<void**>(&pfv))))
-			{
-				CComPtr<IDataObject> dao;
-				if (SUCCEEDED(psv->GetItemObject(SVGIO_SELECTION, IID_IDataObject, reinterpret_cast<void**>(&dao))))
-					vectorFromDataObject(dao);
-			}
-		}
-	}
-}
-
-void Shell32::vectorFromDataObject(CComPtr<IDataObject> dao)
-{
-	FORMATETC formatetc;
-	STGMEDIUM medium;
-
-	formatetc.cfFormat = CF_HDROP;
-	formatetc.ptd = nullptr;
-	formatetc.dwAspect = DVASPECT_CONTENT;
-	formatetc.lindex = -1;
-	formatetc.tymed = TYMED_HGLOBAL;
-
-	medium.tymed = TYMED_HGLOBAL;
-
-	if (SUCCEEDED(dao->GetData(&formatetc, &medium)))
-	{
-		int n = DragQueryFile(HDROP(medium.hGlobal), 0xFFFFFFFF, nullptr, 0);
-
-		for (int i = 0; i < n; i++)
-		{
-			WCHAR buffer[MAX_PATH];
-			DragQueryFile(HDROP(medium.hGlobal), i, buffer, MAX_PATH - 1);
-
-			wstring ws = wstring(buffer);
-			ws.shrink_to_fit();
-
-			vector_items.push_back(ws);
-		}
-	}
-}
-
 Shell32::FocusedWindowType Shell32::GetFocusedWindowType()
 {
 	auto type = INVALID;
 
 	auto hwndfg = GetForegroundWindow();
 
+	if (isCursorActivated(hwndfg))
+		return INVALID;
+
 	auto classBuffer = new WCHAR[MAX_PATH];
 	if (SUCCEEDED(GetClassName(hwndfg, classBuffer, MAX_PATH)))
 	{
@@ -215,3 +33,132 @@ Shell32::FocusedWindowType Shell32::GetFocusedWindowType()
 
 	return type;
 }
+
+void Shell32::GetCurrentSelection(PWCHAR buffer)
+{
+	switch (GetFocusedWindowType())
+	{
+	case EXPLORER:
+		getSelectedFromExplorer(buffer);
+		break;
+	case DESKTOP:
+		getSelectedFromDesktop(buffer);
+		break;
+	default:
+		break;
+	}
+}
+
+void Shell32::getSelectedFromExplorer(PWCHAR buffer)
+{
+	CoInitialize(nullptr);
+
+	CComPtr<IShellWindows> psw;
+	if (FAILED(psw.CoCreateInstance(CLSID_ShellWindows)))
+		return;
+
+	auto hwndFGW = GetForegroundWindow();
+
+	auto count = 0L;
+	psw->get_Count(&count);
+
+	for (auto i = 0; i < count; i++)
+	{
+		VARIANT vi;
+		V_VT(&vi) = VT_I4;
+		V_I4(&vi) = i;
+
+		CComPtr<IDispatch> pdisp;
+		// ReSharper disable once CppSomeObjectMembersMightNotBeInitialized
+		if (FAILED(psw->Item(vi, &pdisp)))
+			continue;
+
+		CComQIPtr<IWebBrowserApp> pwba;
+		if (FAILED(pdisp->QueryInterface(IID_IWebBrowserApp, reinterpret_cast<void**>(&pwba))))
+			continue;
+
+		HWND hwndWBA;
+		if (FAILED(pwba->get_HWND(reinterpret_cast<LONG_PTR*>(&hwndWBA))))
+			continue;
+
+		if (hwndWBA != hwndFGW || isCursorActivated(hwndWBA))
+			continue;
+
+		getSelectedInternal(pwba, buffer);
+	}
+}
+
+void Shell32::getSelectedFromDesktop(PWCHAR buffer)
+{
+	CoInitialize(nullptr);
+
+	CComPtr<IShellWindows> psw;
+	CComQIPtr<IWebBrowserApp> pwba;
+
+	if (FAILED(psw.CoCreateInstance(CLSID_ShellWindows)))
+		return;
+
+	VARIANT pvarLoc = {VT_EMPTY};
+	long phwnd;
+	if (FAILED(psw->FindWindowSW(&pvarLoc, &pvarLoc, SWC_DESKTOP, &phwnd, SWFO_NEEDDISPATCH, reinterpret_cast<IDispatch**>(&pwba))))
+		return;
+
+	if (isCursorActivated(reinterpret_cast<HWND>(phwnd)))
+		return;
+
+	getSelectedInternal(pwba, buffer);
+}
+
+void Shell32::getSelectedInternal(CComQIPtr<IWebBrowserApp> pwba, PWCHAR buffer)
+{
+	CComQIPtr<IServiceProvider> psp;
+	if (FAILED(pwba->QueryInterface(IID_IServiceProvider, reinterpret_cast<void**>(&psp))))
+		return;
+
+	CComPtr<IShellBrowser> psb;
+	if (FAILED(psp->QueryService(SID_STopLevelBrowser, IID_IShellBrowser, reinterpret_cast<LPVOID*>(&psb))))
+		return;
+
+	CComPtr<IShellView> psv;
+	if (FAILED(psb->QueryActiveShellView(&psv)))
+		return;
+
+	CComPtr<IDataObject> dao;
+	if (FAILED(psv->GetItemObject(SVGIO_SELECTION, IID_IDataObject, reinterpret_cast<void**>(&dao))))
+		return;
+
+	return obtainFirstItem(dao, buffer);
+}
+
+void Shell32::obtainFirstItem(CComPtr<IDataObject> dao, PWCHAR buffer)
+{
+	FORMATETC formatetc;
+	STGMEDIUM medium;
+
+	formatetc.cfFormat = CF_HDROP;
+	formatetc.ptd = nullptr;
+	formatetc.dwAspect = DVASPECT_CONTENT;
+	formatetc.lindex = -1;
+	formatetc.tymed = TYMED_HGLOBAL;
+
+	medium.tymed = TYMED_HGLOBAL;
+
+	if (FAILED(dao->GetData(&formatetc, &medium)))
+		return;
+
+	int n = DragQueryFile(HDROP(medium.hGlobal), 0xFFFFFFFF, nullptr, 0);
+
+	if (n < 1)
+		return;
+
+	DragQueryFile(HDROP(medium.hGlobal), 0, buffer, MAX_PATH - 1);
+}
+
+bool Shell32::isCursorActivated(HWND hwnd)
+{
+	auto tId = GetWindowThreadProcessId(hwnd, nullptr);
+
+	GUITHREADINFO gui = {sizeof gui};
+	GetGUIThreadInfo(tId, &gui);
+	return gui.flags || gui.hwndCaret;
+}

QuickLook.Native.Shell32/Shell32.h

@@ -13,16 +13,13 @@ public:
 	};
 
 	static FocusedWindowType GetFocusedWindowType();
-	static void SaveCurrentSelection();
+	static void GetCurrentSelection(PWCHAR buffer);
-	static UINT GetCurrentSelectionCount();
-	static void GetCurrentSelectionBuffer(PWCHAR buffer);
 
 private:
-	static std::vector<std::wstring> vector_items;
+	static void getSelectedFromDesktop(PWCHAR buffer);
+	static void getSelectedFromExplorer(PWCHAR buffer);
 
-	static void SaveSelectedFromDesktop();
+	static void getSelectedInternal(CComQIPtr<IWebBrowserApp> pWebBrowserApp, PWCHAR buffer);
-	static void SaveSelectedFromExplorer();
+	static void obtainFirstItem(CComPtr<IDataObject> dao, PWCHAR buffer);
-
+	static bool isCursorActivated(HWND hwndfg);
-	static CComQIPtr<IWebBrowser2> AttachDesktopShellWindow();
-	static void vectorFromDataObject(CComPtr<IDataObject> dao);
 };

QuickLook/App.xaml.cs

@@ -4,6 +4,7 @@ using System.IO;
 using System.Linq;
 using System.Reflection;
 using System.Windows;
+using QuickLook.Helpers;
 
 namespace QuickLook
 {

QuickLook/BackgroundListener.cs

@@ -17,6 +17,7 @@ namespace QuickLook
         public void Dispose()
         {
             _hook?.Dispose();
+            _hook = null;
         }
 
         private void HotkeyEventHandler(object sender, KeyEventArgs e)

QuickLook/FocusMonitor.cs

@@ -1,19 +1,18 @@
 using System;
 using System.Threading;
 using System.Threading.Tasks;
-using QuickLook.Helpers;
 
 namespace QuickLook
 {
     internal class FocusMonitor
     {
-        public delegate void FocusedItemChangedEventHandler(FocusedItemChangedEventArgs e);
+        public delegate void HeartbeatEventHandler(HeartbeatEventArgs e);
 
         private static FocusMonitor _instance;
 
         public bool IsRunning { get; private set; }
 
-        public event FocusedItemChangedEventHandler FocusedItemChanged;
+        public event HeartbeatEventHandler Heartbeat;
 
         public void Start()
         {
@@ -21,21 +20,16 @@ namespace QuickLook
 
             new Task(() =>
             {
-                var currentPath = NativeMethods.QuickLook.GetCurrentSelectionFirst();
-
                 while (IsRunning)
                 {
                     Thread.Sleep(500);
 
-                    if (WindowHelper.IsFocusedControlExplorerItem())
+                    if (NativeMethods.QuickLook.GetFocusedWindowType() ==
-                    {
+                        NativeMethods.QuickLook.FocusedWindowType.Invalid)
-                        var file = NativeMethods.QuickLook.GetCurrentSelectionFirst();
+                        continue;
-                        if (file != currentPath)
+
-                        {
+                    var file = NativeMethods.QuickLook.GetCurrentSelection();
-                            FocusedItemChanged?.Invoke(new FocusedItemChangedEventArgs(file));
+                    Heartbeat?.Invoke(new HeartbeatEventArgs(DateTime.Now.Ticks, file));
-                            currentPath = file;
-                        }
-                    }
                 }
             }).Start();
         }
@@ -51,13 +45,15 @@ namespace QuickLook
         }
     }
 
-    internal class FocusedItemChangedEventArgs : EventArgs
+    internal class HeartbeatEventArgs : EventArgs
     {
-        public FocusedItemChangedEventArgs(string files)
+        public HeartbeatEventArgs(long tick, string files)
         {
+            InvokeTick = tick;
             FocusedFile = files;
         }
 
+        public long InvokeTick { get; }
         public string FocusedFile { get; }
     }
 }

QuickLook/Helpers/PidHelper.cs

@@ -1,7 +1,7 @@
 using System.Diagnostics;
 using System.IO;
 
-namespace QuickLook
+namespace QuickLook.Helpers
 {
     internal static class PidHelper
     {

QuickLook/Helpers/WindowHelper.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Diagnostics;
-using System.Text;
 using System.Windows;
 using System.Windows.Forms;
 using System.Windows.Interop;
@@ -61,65 +60,21 @@ namespace QuickLook.Helpers
             pixelY = (int) (matrix.M22 * unitY);
         }
 
+        internal static bool IsForegroundWindowBelongToSelf()
+        {
+            var hwnd = User32.GetForegroundWindow();
+            if (hwnd == IntPtr.Zero)
+                return false;
+
+            User32.GetWindowThreadProcessId(hwnd, out uint procId);
+            return procId == Process.GetCurrentProcess().Id;
+        }
+
         internal static void SetNoactivate(WindowInteropHelper window)
         {
             User32.SetWindowLong(window.Handle, User32.GWL_EXSTYLE,
                 User32.GetWindowLong(window.Handle, User32.GWL_EXSTYLE) |
                 User32.WS_EX_NOACTIVATE);
         }
-
-        internal static string GetWindowClassName(IntPtr window)
-        {
-            var pClassName = new StringBuilder(256);
-            User32.GetClassName(window, pClassName, pClassName.Capacity);
-
-            return pClassName.ToString();
-        }
-
-        internal static IntPtr GetParentWindow(IntPtr child)
-        {
-            return User32.GetParent(child);
-        }
-
-        internal static IntPtr GetFocusedWindow()
-        {
-            var activeWindowHandle = User32.GetForegroundWindow();
-
-            var activeWindowThread = User32.GetWindowThreadProcessId(activeWindowHandle, IntPtr.Zero);
-            var currentThread = Kernel32.GetCurrentThreadId();
-
-            User32.AttachThreadInput(activeWindowThread, currentThread, true);
-            var focusedControlHandle = User32.GetFocus();
-            User32.AttachThreadInput(activeWindowThread, currentThread, false);
-
-            return focusedControlHandle;
-        }
-
-        internal static bool IsFocusedWindowSelf()
-        {
-            var procId = Process.GetCurrentProcess().Id;
-            uint activeProcId;
-            User32.GetWindowThreadProcessId(GetFocusedWindow(), out activeProcId);
-
-            return activeProcId == procId;
-        }
-
-        internal static bool IsFocusedControlExplorerItem()
-        {
-            if (NativeMethods.QuickLook.GetFocusedWindowType() == 0)
-                return false;
-
-            var focusedWindowClass = GetWindowClassName(GetFocusedWindow());
-            var focusedWindowParentClass =
-                GetWindowClassName(GetParentWindow(GetFocusedWindow()));
-
-            if (focusedWindowClass != "SysListView32" && focusedWindowClass != "DirectUIHWND")
-                return false;
-
-            if (focusedWindowParentClass != "SHELLDLL_DefView")
-                return false;
-
-            return true;
-        }
     }
 }

QuickLook/MainWindowTransparent.xaml

@@ -62,11 +62,17 @@
                                      WindowChrome.IsHitTestVisibleInChrome="True"
                                      Height="15" Margin="10,0" Foreground="Gray"
                                      Cursor="Hand" />
-                    <Button x:Name="buttonOpenWith" DockPanel.Dock="Right" Content="Open with ..." Height="20"
+                    <Button x:Name="buttonOpenWith" DockPanel.Dock="Right" Content="Open with..." Height="20"
                             Margin="10,0,0,0" Padding="5,0"
                             Focusable="False" Cursor="Hand"
                             Background="#E5EEEEEE" BorderBrush="#E59A9A9A"
-                            WindowChrome.IsHitTestVisibleInChrome="True" Foreground="#FF404040" />
+                            WindowChrome.IsHitTestVisibleInChrome="True" Foreground="#FF404040">
+                        <Button.ContentTemplate>
+                            <DataTemplate>
+                                <ContentPresenter Content="{Binding}" RecognizesAccessKey="False" />
+                            </DataTemplate>
+                        </Button.ContentTemplate>
+                        </Button>
                     <!-- set grid.background colour makes it clickable -->
                     <Grid x:Name="titleArea" Background="Transparent">
                         <TextBlock Text="{Binding ContextObject.Title, ElementName=mainWindow}" FontSize="14"

QuickLook/MainWindowTransparent.xaml.cs

@@ -3,13 +3,11 @@ using System.Diagnostics;
 using System.IO;
 using System.Runtime.ExceptionServices;
 using System.Windows;
-using System.Windows.Forms;
 using System.Windows.Input;
 using System.Windows.Threading;
 using QuickLook.Helpers;
 using QuickLook.Helpers.BlurLibrary;
 using QuickLook.Plugin;
-using KeyEventArgs = System.Windows.Forms.KeyEventArgs;
 
 namespace QuickLook
 {
@@ -38,16 +36,16 @@ namespace QuickLook
                     BlurWindow.EnableWindowBlur(this);
             };
 
-            buttonCloseWindow.MouseLeftButtonUp += (sender, e) => ViewWindowManager.GetInstance()
+            buttonCloseWindow.MouseLeftButtonUp += (sender, e) =>
-                .InvokeRoutine(new KeyEventArgs(Keys.Escape));
+                ViewWindowManager.GetInstance().ClosePreview();
 
-            buttonOpenWith.Click += (sender, e) => ViewWindowManager.GetInstance()
+            buttonOpenWith.Click += (sender, e) =>
-                .InvokeRoutine(new KeyEventArgs(Keys.Enter));
+                ViewWindowManager.GetInstance().RunAndClosePreview();
         }
 
         public ContextObject ContextObject { get; private set; }
 
-        internal void RunAndClose()
+        internal void RunAndHide()
         {
             if (string.IsNullOrEmpty(_path))
                 return;
@@ -83,6 +81,12 @@ namespace QuickLook
 
         internal void UnloadPlugin()
         {
+            // the focused element will not processed by GC: https://stackoverflow.com/questions/30848939/memory-leak-due-to-window-efectivevalues-retention
+            FocusManager.SetFocusedElement(this, null);
+            Keyboard.DefaultRestoreFocusMode =
+                RestoreFocusMode.None; // WPF will put the focused item into a "_restoreFocus" list ... omg
+            Keyboard.ClearFocus();
+
             ContextObject.Reset();
 
             _plugin?.Cleanup();
@@ -151,10 +155,6 @@ namespace QuickLook
 
         internal void BeginHide()
         {
-            // the focused element will not processed by GC: https://stackoverflow.com/questions/30848939/memory-leak-due-to-window-efectivevalues-retention
-            FocusManager.SetFocusedElement(this, null);
-            Keyboard.ClearFocus();
-
             UnloadPlugin();
             Hide();
 

QuickLook/NativeMethods/QuickLook.cs

@@ -1,5 +1,4 @@
-using System.Linq;
+using System.Runtime.InteropServices;
-using System.Runtime.InteropServices;
 using System.Text;
 using System.Threading.Tasks;
 
@@ -8,40 +7,30 @@ namespace QuickLook.NativeMethods
     internal static class QuickLook
     {
         [DllImport("QuickLook.Native.Shell32.dll", CallingConvention = CallingConvention.Cdecl)]
-        internal static extern int GetFocusedWindowType();
+        internal static extern FocusedWindowType GetFocusedWindowType();
 
-        [DllImport("QuickLook.Native.Shell32.dll", CallingConvention = CallingConvention.Cdecl)]
+        [DllImport("QuickLook.Native.Shell32.dll", EntryPoint = "GetCurrentSelection",
-        internal static extern void SaveCurrentSelection();
+            CallingConvention = CallingConvention.Cdecl)]
+        internal static extern void GetCurrentSelectionNative([MarshalAs(UnmanagedType.LPWStr)] StringBuilder sb);
 
-        [DllImport("QuickLook.Native.Shell32.dll", CallingConvention = CallingConvention.Cdecl)]
+        internal static string GetCurrentSelection()
-        internal static extern int GetCurrentSelectionCount();
-
-        [DllImport("QuickLook.Native.Shell32.dll", CallingConvention = CallingConvention.Cdecl)]
-        internal static extern void GetCurrentSelectionBuffer([MarshalAs(UnmanagedType.LPWStr)] StringBuilder buffer);
-
-        internal static string[] GetCurrentSelection()
         {
             StringBuilder sb = null;
             // communicate with COM in a separate thread
             Task.Run(() =>
             {
-                SaveCurrentSelection();
+                sb = new StringBuilder(255 + 1);
-
+                GetCurrentSelectionNative(sb);
-                var n = GetCurrentSelectionCount();
-                if (n != 0)
-                {
-                    sb = new StringBuilder(n * 261); // MAX_PATH + NULL = 261
-                    GetCurrentSelectionBuffer(sb);
-                }
             }).Wait();
-            return sb == null || sb.Length == 0 ? new string[0] : sb.ToString().Split('|');
+
+            return sb?.ToString() ?? string.Empty;
         }
 
-        internal static string GetCurrentSelectionFirst()
+        internal enum FocusedWindowType
         {
-            var files = GetCurrentSelection();
+            Invalid,
-
+            Desktop,
-            return files.Any() ? files.First() : string.Empty;
+            Explorer
         }
     }
 }

QuickLook/Plugin/InfoPanel/InfoPanel.xaml

@@ -31,8 +31,9 @@
         </Image>
         <Grid Grid.Column="1">
             <Grid.ColumnDefinitions>
-                <ColumnDefinition Width="20" />
+                <ColumnDefinition Width="5" />
                 <ColumnDefinition Width="*" />
+                <ColumnDefinition Width="10" />
             </Grid.ColumnDefinitions>
             <Grid.RowDefinitions>
                 <RowDefinition Height="10" />
@@ -42,7 +43,11 @@
                 <RowDefinition Height="Auto" />
                 <RowDefinition Height="Auto" />
             </Grid.RowDefinitions>
-            <TextBlock x:Name="filename" Grid.Row="1" Grid.Column="1" FontSize="19" FontWeight="SemiBold" Padding="3">Filename.ext</TextBlock>
+            <TextBlock x:Name="filename" Grid.Row="1" Grid.Column="1" FontSize="19" FontWeight="SemiBold" Padding="3"
+                       TextWrapping="Wrap"
+                       LineHeight="25" MaxHeight="60" TextTrimming="CharacterEllipsis">
+                FilenameFilenameFilenameFilenameFilenameFilenameFilenameFilenameFilenameFilename.ext
+            </TextBlock>
             <TextBlock x:Name="modDate" Grid.Row="3" Grid.Column="1" Padding="3">Last modified at 01/01/2017 00:00:00</TextBlock>
             <TextBlock x:Name="totalSize" Grid.Row="4" Grid.Column="1" Padding="3">Calculating size...</TextBlock>
         </Grid>

QuickLook/QuickLook.csproj

@@ -116,7 +116,7 @@
     <Compile Include="NativeMethods\Shell32\IWshShortcut.cs" />
     <Compile Include="NativeMethods\Shell32\ShellLink.cs" />
     <Compile Include="NativeMethods\Shell32\WshShell.cs" />
-    <Compile Include="PidHelper.cs" />
+    <Compile Include="Helpers\PidHelper.cs" />
     <Compile Include="PluginManager.cs" />
     <Compile Include="Plugin\InfoPanel\DpiHelpers.cs" />
     <Compile Include="Plugin\InfoPanel\Extensions.cs" />

QuickLook/TrayIconManager.cs

@@ -3,7 +3,6 @@ using System.Diagnostics;
 using System.Windows.Forms;
 using QuickLook.Helpers;
 using QuickLook.Properties;
-using Application = System.Windows.Application;
 
 namespace QuickLook
 {
@@ -26,14 +25,17 @@ namespace QuickLook
         {
             _icon = new NotifyIcon
             {
+                Text = $"QuickLook v{Application.ProductVersion}",
                 Icon = Resources.app,
                 Visible = true,
                 ContextMenu = new ContextMenu(new[]
                 {
-                    new MenuItem($"Check for &Updates ({System.Windows.Forms.Application.ProductVersion})",
+                    new MenuItem($"v{Application.ProductVersion}") {Enabled = false},
+                    new MenuItem("-"),
+                    new MenuItem("Check for &Updates...",
                         (sender, e) => Process.Start(@"http://pooi.moe/QuickLook/")),
                     _itemAutorun,
-                    new MenuItem("&Quit", (sender, e) => Application.Current.Shutdown())
+                    new MenuItem("&Quit", (sender, e) => System.Windows.Application.Current.Shutdown())
                 })
             };
 

QuickLook/ViewWindowManager.cs

@@ -9,13 +9,14 @@ using QuickLook.Plugin;
 
 namespace QuickLook
 {
-    internal class ViewWindowManager
+    internal class ViewWindowManager : IDisposable
     {
         private static ViewWindowManager _instance;
 
         private readonly MainWindowNoTransparent _viewWindowNoTransparent;
         private readonly MainWindowTransparent _viewWindowTransparentTransparent;
         private MainWindowTransparent _currentMainWindow;
+        private long _lastSwitchTick;
 
         private string _path = string.Empty;
 
@@ -27,10 +28,13 @@ namespace QuickLook
             _currentMainWindow = _viewWindowTransparentTransparent;
         }
 
+        public void Dispose()
+        {
+            StopFocusMonitor();
+        }
+
         internal void InvokeRoutine(KeyEventArgs kea)
         {
-            Debug.WriteLine(kea.KeyCode);
-
             switch (kea.KeyCode)
             {
                 case Keys.Up:
@@ -53,22 +57,29 @@ namespace QuickLook
             }
         }
 
-        private void RunAndClosePreview(KeyEventArgs kea = null)
+        internal void RunAndClosePreview(KeyEventArgs kea = null)
         {
-            if (!WindowHelper.IsFocusedControlExplorerItem() && !WindowHelper.IsFocusedWindowSelf())
+            if (NativeMethods.QuickLook.GetFocusedWindowType() ==
+                NativeMethods.QuickLook.FocusedWindowType.Invalid)
+                if (!WindowHelper.IsForegroundWindowBelongToSelf())
                     return;
 
             if (_currentMainWindow.Visibility != Visibility.Visible)
                 return;
 
             StopFocusMonitor();
-            _currentMainWindow.RunAndClose();
+            _currentMainWindow.RunAndHide();
             if (kea != null)
                 kea.Handled = true;
         }
 
         internal void ClosePreview(KeyEventArgs kea = null)
         {
+            if (NativeMethods.QuickLook.GetFocusedWindowType() ==
+                NativeMethods.QuickLook.FocusedWindowType.Invalid)
+                if (!WindowHelper.IsForegroundWindowBelongToSelf())
+                    return;
+
             StopFocusMonitor();
             _currentMainWindow.BeginHide();
 
@@ -78,7 +89,11 @@ namespace QuickLook
 
         private void TogglePreview(KeyEventArgs kea = null)
         {
-            if (!WindowHelper.IsFocusedControlExplorerItem() && !WindowHelper.IsFocusedWindowSelf())
+            _lastSwitchTick = DateTime.Now.Ticks;
+
+            if (NativeMethods.QuickLook.GetFocusedWindowType() ==
+                NativeMethods.QuickLook.FocusedWindowType.Invalid)
+                if (!WindowHelper.IsForegroundWindowBelongToSelf())
                     return;
 
             if (_currentMainWindow.Visibility == Visibility.Visible)
@@ -87,7 +102,7 @@ namespace QuickLook
             }
             else
             {
-                _path = NativeMethods.QuickLook.GetCurrentSelectionFirst();
+                _path = NativeMethods.QuickLook.GetCurrentSelection();
                 InvokeViewer();
             }
             if (kea != null)
@@ -99,38 +114,34 @@ namespace QuickLook
             if (_currentMainWindow.Visibility != Visibility.Visible)
                 return;
 
-            if (!WindowHelper.IsFocusedControlExplorerItem())
+            _lastSwitchTick = DateTime.Now.Ticks;
+
+            if (NativeMethods.QuickLook.GetFocusedWindowType() ==
+                NativeMethods.QuickLook.FocusedWindowType.Invalid)
                 return;
 
-            _path = NativeMethods.QuickLook.GetCurrentSelectionFirst();
+            _path = NativeMethods.QuickLook.GetCurrentSelection();
 
             InvokeViewer();
             if (kea != null)
                 kea.Handled = false;
         }
 
-        private void SwitchPreviewRemoteInvoke(FocusedItemChangedEventArgs e)
+        private void SwitchPreviewRemoteInvoke(HeartbeatEventArgs e)
         {
-            Debug.WriteLine("SwitchPreviewRemoteInvoke");
+            // sleep for 1.5s
+            if (e.InvokeTick - _lastSwitchTick < 1.5 * TimeSpan.TicksPerSecond)
+                return;
 
             if (e.FocusedFile == _path)
                 return;
 
+            Debug.WriteLine("SwitchPreviewRemoteInvoke:" + (e.InvokeTick - _lastSwitchTick));
+
             if (string.IsNullOrEmpty(e.FocusedFile))
                 return;
 
-            _currentMainWindow?.Dispatcher.Invoke(() =>
+            _currentMainWindow?.Dispatcher.Invoke(() => SwitchPreview());
-            {
-                if (_currentMainWindow.Visibility != Visibility.Visible)
-                    return;
-
-                if (!WindowHelper.IsFocusedControlExplorerItem())
-                    return;
-
-                _path = NativeMethods.QuickLook.GetCurrentSelectionFirst();
-
-                InvokeViewer();
-            });
         }
 
         private void RunFocusMonitor()
@@ -138,7 +149,7 @@ namespace QuickLook
             if (!FocusMonitor.GetInstance().IsRunning)
             {
                 FocusMonitor.GetInstance().Start();
-                FocusMonitor.GetInstance().FocusedItemChanged += SwitchPreviewRemoteInvoke;
+                FocusMonitor.GetInstance().Heartbeat += SwitchPreviewRemoteInvoke;
             }
         }
 
@@ -147,7 +158,7 @@ namespace QuickLook
             if (FocusMonitor.GetInstance().IsRunning)
             {
                 FocusMonitor.GetInstance().Stop();
-                FocusMonitor.GetInstance().FocusedItemChanged -= SwitchPreviewRemoteInvoke;
+                FocusMonitor.GetInstance().Heartbeat -= SwitchPreviewRemoteInvoke;
             }
         }