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75 changes: 5 additions & 70 deletions Flow.Launcher.Infrastructure/FileExplorerHelper.cs
Original file line number Diff line number Diff line change
@@ -1,8 +1,4 @@
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Win32;

namespace Flow.Launcher.Infrastructure
{
Expand All @@ -13,84 +9,23 @@ public static class FileExplorerHelper
/// </summary>
public static string GetActiveExplorerPath()
{
var explorerWindow = GetActiveExplorer();
string locationUrl = explorerWindow?.LocationURL;
return !string.IsNullOrEmpty(locationUrl) ? GetDirectoryPath(new Uri(locationUrl).LocalPath) : null;
var explorerPath = DialogJump.DialogJump.GetActiveExplorerPath();
return !string.IsNullOrEmpty(explorerPath) ?
GetDirectoryPath(new Uri(explorerPath).LocalPath) :
null;
}

/// <summary>
/// Get directory path from a file path
/// </summary>
private static string GetDirectoryPath(string path)
{
if (!path.EndsWith("\\"))
if (!path.EndsWith('\\'))
{
return path + "\\";
}

return path;
}

/// <summary>
/// Gets the file explorer that is currently in the foreground
/// </summary>
private static dynamic GetActiveExplorer()
{
Type type = Type.GetTypeFromProgID("Shell.Application");
if (type == null) return null;
dynamic shell = Activator.CreateInstance(type);
if (shell == null)
{
return null;
}

var explorerWindows = new List<dynamic>();
var openWindows = shell.Windows();
for (int i = 0; i < openWindows.Count; i++)
{
var window = openWindows.Item(i);
if (window == null) continue;

// find the desired window and make sure that it is indeed a file explorer
// we don't want the Internet Explorer or the classic control panel
// ToLower() is needed, because Windows can report the path as "C:\\Windows\\Explorer.EXE"
if (Path.GetFileName((string)window.FullName)?.ToLower() == "explorer.exe")
{
explorerWindows.Add(window);
}
}

if (explorerWindows.Count == 0) return null;

var zOrders = GetZOrder(explorerWindows);

return explorerWindows.Zip(zOrders).MinBy(x => x.Second).First;
}

/// <summary>
/// Gets the z-order for one or more windows atomically with respect to each other. In Windows, smaller z-order is higher. If the window is not top level, the z order is returned as -1.
/// </summary>
private static IEnumerable<int> GetZOrder(List<dynamic> hWnds)
{
var z = new int[hWnds.Count];
for (var i = 0; i < hWnds.Count; i++) z[i] = -1;

var index = 0;
var numRemaining = hWnds.Count;
PInvoke.EnumWindows((wnd, _) =>
{
var searchIndex = hWnds.FindIndex(x => new IntPtr(x.HWND) == wnd);
if (searchIndex != -1)
{
z[searchIndex] = index;
numRemaining--;
if (numRemaining == 0) return false;
}
index++;
return true;
}, IntPtr.Zero);

return z;
}
}
}
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