Remove entries for killed processes

src/modules/FileLocksmith/FileLocksmithGUI/MainWindow.xaml.cpp

@@ -46,6 +46,11 @@ namespace winrt::FileLocksmithGUI::implementation
             {
                 ProcessEntry entry(process.name, process.pid, process.num_files);
                 stackPanel().Children().Append(entry);
+
+                // Launch a thread to erase this entry if the process exits
+                std::thread([&, pid = process.pid] {
+                    watch_process(pid);
+                }).detach();
             }
 
             if (process_info.empty())
@@ -115,4 +120,40 @@ namespace winrt::FileLocksmithGUI::implementation
         text_block.VerticalAlignment(VerticalAlignment::Center);
         stackPanel().Children().Append(text_block);
     }
+
+    void MainWindow::watch_process(DWORD pid)
+    {
+        HANDLE process = OpenProcess(SYNCHRONIZE, FALSE, pid);
+
+        if (!process)
+        {
+            return;
+        }
+
+        auto wait_result = WaitForSingleObject(process, INFINITE);
+        CloseHandle(process);
+
+        if (wait_result == WAIT_OBJECT_0)
+        {
+            // Find entry with this PID and erase it
+            DispatcherQueue().TryEnqueue([&, pid] {
+
+                for (uint32_t i = 0; i < stackPanel().Children().Size(); i++)
+                {
+                    auto element = stackPanel().Children().GetAt(i);
+                    auto process_entry = element.try_as<ProcessEntry>();
+                    if (!process_entry)
+                    {
+                        continue;
+                    }
+
+                    if (process_entry.Pid() == pid)
+                    {
+                        stackPanel().Children().RemoveAt(i);
+                        return;
+                    }
+                }
+            });
+        }
+    }
 }

src/modules/FileLocksmith/FileLocksmithGUI/MainWindow.xaml.h

@@ -13,6 +13,7 @@ namespace winrt::FileLocksmithGUI::implementation
         void find_processes();
         void place_and_resize();
         void display_text_info(std::wstring text);
+        void watch_process(DWORD pid);
     };
 }
 

src/modules/FileLocksmith/FileLocksmithGUI/ProcessEntry.idl

@@ -4,5 +4,6 @@ namespace FileLocksmithGUI
     runtimeclass ProcessEntry : Microsoft.UI.Xaml.Controls.UserControl
     {
         ProcessEntry(String process, UInt32 pid, UInt64 num_files);
+        UInt32 Pid();
     }
 }

src/modules/FileLocksmith/FileLocksmithGUI/ProcessEntry.xaml.cpp

@@ -36,17 +36,10 @@ namespace winrt::FileLocksmithGUI::implementation
         }
 
         CloseHandle(process);
-
-        auto siblings = Parent().as<Controls::StackPanel>().Children();
-        if (uint32_t index; siblings.IndexOf(*this, index))
-        {
-            siblings.RemoveAt(index);
-        }
-
-        if (siblings.Size() == 0)
-        {
-            auto main_window = Parent().as<Controls::StackPanel>().Parent().as<MainWindow>();
-            main_window.DisplayNoResultsInfo();
-        }
+    }
+    
+    DWORD ProcessEntry::Pid()
+    {
+        return m_pid;
     }
 }

src/modules/FileLocksmith/FileLocksmithGUI/ProcessEntry.xaml.h

@@ -11,6 +11,7 @@ namespace winrt::FileLocksmithGUI::implementation
     {
         ProcessEntry(const winrt::hstring& process, DWORD pid, uint64_t num_files);
         void killProcessClick(winrt::Windows::Foundation::IInspectable const& sender, winrt::Microsoft::UI::Xaml::RoutedEventArgs const& e);
+        DWORD Pid();
     private:
         DWORD m_pid;
     };