support single instance

Author: huangjia2107

src/XamlTheme/Adorners/RulerIndicatorAdorner.cs

@@ -31,8 +31,8 @@ protected override void OnRender(DrawingContext drawingContext)
  if (AdornedElement == null || _pen == null || DoubleUtil.IsZero(_length))
  return;
 
- var screenPos = new Win32.POINT();
- if (Win32.GetCursorPos(ref screenPos))
+ var screenPos = new Utils.Win32.POINT();
+ if (Utils.Win32.GetCursorPos(ref screenPos))
  {
  var pos = AdornedElement.PointFromScreen(new Point(screenPos.X, screenPos.Y));
 

src/XamlTheme/Behaviors/DragItemsPositionBehavior.cs

@@ -278,8 +278,8 @@ private void EndDrag()
 
  private void MoveChild(UIElement dragedChild)
  {
- var screenPos = new Win32.POINT();
- if (!Win32.GetCursorPos(ref screenPos))
+ var screenPos = new Utils.Win32.POINT();
+ if (!Utils.Win32.GetCursorPos(ref screenPos))
  return;
 
  var posToPanel = AssociatedObject.PointFromScreen(new Point(screenPos.X, screenPos.Y));

src/XamlUtil/Common/Win32.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace XamlUtil.Common
+{
+ public static class Win32
+ {
+ public const int WS_SHOWNORMAL = 1;
+
+ [DllImport("User32.dll")]
+ public static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow = WS_SHOWNORMAL);
+
+ [DllImport("User32.dll")]
+ public static extern bool SetForegroundWindow(IntPtr hWnd);
+
+ [DllImport("User32.dll")]
+ private static extern int SendMessage(IntPtr hWnd, uint Msg, int wParam, int lParam);
+ }
+}

src/XamlViewer/App.xaml.cs

@@ -2,6 +2,9 @@
 using System.Linq;
 using System.Collections.Generic;
 using System.IO;
+using System.Diagnostics;
+using System.Reflection;
+using System.Threading;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
@@ -31,6 +34,7 @@ namespace XamlViewer
  public partial class App : PrismApplication
  {
  private string[] _xamlFiles = null;
+ private Mutex _singleMutex = null;
 
  public App()
  : base()
@@ -70,17 +74,58 @@ private void CurrentDomain_UnhandledException(object sender, UnhandledExceptionE
 
  #endregion
 
+ public static Process GetRunningInstance()
+ {
+ var current = Process.GetCurrentProcess();
+ var processes = Process.GetProcessesByName(current.ProcessName);
+
+ foreach (Process process in processes)
+ {
+ if (process.Id != current.Id)
+ {
+ var processLocation = Assembly.GetExecutingAssembly().Location.Replace("/", "//");
+
+ if (Path.GetDirectoryName(processLocation) + "\\" + Path.GetFileNameWithoutExtension(processLocation)
+ == Path.GetDirectoryName(current.MainModule.FileName) + "\\" + Path.GetFileNameWithoutExtension(current.MainModule.FileName))
+ return process;
+ }
+ }
+
+ return null;
+ }
+
  protected override void OnStartup(StartupEventArgs e)
- { 
- if(e.Args.Length > 0)
+ {
+ _singleMutex = new Mutex(true, "huangjia2107_XAML_VIEWER", out bool isNew);
+ var process = GetRunningInstance();
+
+ if (!isNew && process != null)
+ {
+ Win32.ShowWindowAsync(process.MainWindowHandle);
+ Win32.SetForegroundWindow(process.MainWindowHandle);
+
+ if (e.Args.Length > 0)
+ {
+ var xamls = e.Args.Where(f => Path.GetExtension(f).ToLower() == ".xaml").ToArray();
+ if (xamls != null && xamls.Length > 0)
+ {
+ //TODO:Send Message...
+ }
+ }
+
+ Environment.Exit(0);
+ return;
+ }
+
+ if (e.Args.Length > 0)
  {
  _xamlFiles = e.Args.Where(f => Path.GetExtension(f).ToLower() == ".xaml").ToArray();
  if (_xamlFiles == null || _xamlFiles.Length == 0)
  {
  Environment.Exit(0);
  return;
  }
- } 
+ }
 
  base.OnStartup(e);
  }
@@ -153,10 +198,10 @@ protected override void RegisterTypes(IContainerRegistry containerRegistry)
  appData.Config.Files.RemoveAll(f => _xamlFiles.Any(xf => Path.GetFullPath(xf).ToLower() == Path.GetFullPath(f).ToLower()));
  appData.Config.Files.InsertRange(0, _xamlFiles);
  }
-
-//Data Source
-if(FileHelper.Exists(ResourcesMap.LocationDic[Location.DataSourceFile]))
- appData.Config.DataSourceJsonString = FileHelper.LoadFromFile(ResourcesMap.LocationDic[Location.DataSourceFile]);
+
+ //Data Source
+ if (FileHelper.Exists(ResourcesMap.LocationDic[Location.DataSourceFile]))
+  appData.Config.DataSourceJsonString = FileHelper.LoadFromFile(ResourcesMap.LocationDic[Location.DataSourceFile]);
 
  containerRegistry.RegisterInstance(appData);
  }
@@ -167,16 +212,16 @@ protected override IModuleCatalog CreateModuleCatalog()
  }
 
  protected override void OnInitialized()
- { 
+ {
  base.OnInitialized();
- 
+
  var eventAggregator = Container.Resolve<IEventAggregator>();
-var appData = Container.Resolve<AppData>();
-
+ var appData = Container.Resolve<AppData>();
+
  eventAggregator?.GetEvent<InitWorkAreaEvent>().Publish();
-
-if(appData.Config.IsSyncDataSource)
- eventAggregator?.GetEvent<SyncDataSourceEvent>().Publish(appData.Config.DataSourceJsonString?.Trim());
+
+ if (appData.Config.IsSyncDataSource)
+  eventAggregator?.GetEvent<SyncDataSourceEvent>().Publish(appData.Config.DataSourceJsonString?.Trim());
  }
  }
 }