From b9b4e662b40c2b88a13aad3812942a746b963056 Mon Sep 17 00:00:00 2001
From: shibayan <shiba-yan@outlook.com>
Date: Tue, 19 Jan 2016 23:05:56 +0900
Subject: [PATCH] Change the condition to perform QuickLook

---
 src/WinQuickLook/App.xaml.cs              | 19 +++++++++++--------
 src/WinQuickLook/Interop/Consts.cs        |  3 +++
 src/WinQuickLook/Interop/NativeMethods.cs |  6 ++++++
 3 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/src/WinQuickLook/App.xaml.cs b/src/WinQuickLook/App.xaml.cs
index 2d35d13a..ddde8def 100644
--- a/src/WinQuickLook/App.xaml.cs
+++ b/src/WinQuickLook/App.xaml.cs
@@ -12,6 +12,8 @@ public partial class App
 
         private QuickLookWindow _quickLookWindow;
 
+        private string _currentItem;
+
         protected override void OnStartup(StartupEventArgs e)
         {
             base.OnStartup(e);
@@ -52,20 +54,21 @@ private void CancelQuickLook()
 
         private void PerformQuickLook()
         {
-            if (_quickLookWindow?.CloseIfActive() ?? false)
-            {
-                _quickLookWindow = null;
-
-                return;
-            }
-
             var selectedItem = WinExplorerHelper.GetSelectedItem();
 
-            if (selectedItem == null)
+            if (selectedItem == null || selectedItem == _currentItem)
             {
+                if (_quickLookWindow?.CloseIfActive() ?? false)
+                {
+                    _currentItem = null;
+                    _quickLookWindow = null;
+                }
+
                 return;
             }
 
+            _currentItem = selectedItem;
+
             _quickLookWindow?.Close();
             _quickLookWindow = null;
 
diff --git a/src/WinQuickLook/Interop/Consts.cs b/src/WinQuickLook/Interop/Consts.cs
index f8a8804d..0789dcea 100644
--- a/src/WinQuickLook/Interop/Consts.cs
+++ b/src/WinQuickLook/Interop/Consts.cs
@@ -9,6 +9,9 @@ public static class Consts
         public const int WM_KEYDOWN = 0x0100;
 
         public const int MAX_PATH = 260;
+
+        public const int GWL_EXSTYLE = -20;
+        public const int WS_EX_NOACTIVATE = 0x8000000;
     }
 
     [Flags]
diff --git a/src/WinQuickLook/Interop/NativeMethods.cs b/src/WinQuickLook/Interop/NativeMethods.cs
index c5dd63f7..a23afdcf 100644
--- a/src/WinQuickLook/Interop/NativeMethods.cs
+++ b/src/WinQuickLook/Interop/NativeMethods.cs
@@ -24,6 +24,12 @@ public static class NativeMethods
         [DllImport("user32.dll")]
         public static extern IntPtr CallNextHookEx(IntPtr hook, int nCode, IntPtr wParam, IntPtr lParam);
 
+        [DllImport("user32.dll")]
+        public static extern IntPtr SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
+
+        [DllImport("user32.dll")]
+        public static extern int GetWindowLong(IntPtr hWnd, int nIndex);
+
         [DllImport("gdi32.dll")]
         public static extern bool DeleteObject(IntPtr hObject);