Add button to switch to the selected window

Author: R-N

PiP-Tool.Native/NativeMethods.cs

@@ -69,6 +69,24 @@ public static class NativeMethods
         [DllImport("user32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
         public static extern IntPtr MonitorFromWindow(IntPtr hwnd, MonitorDefaultTo dwFlags);
 
+        [DllImport("user32.dll", SetLastError = true)]
+        public static extern void SwitchToThisWindow(IntPtr hWnd);
+
+        [DllImport("user32.dll", SetLastError = true)]
+        public static extern void SwitchToThisWindow(IntPtr hWnd, bool fAltTab);
+
+        [DllImport("user32.dll", SetLastError = true)]
+        public static extern IntPtr SetActiveWindow(IntPtr hWnd);
+
+        [DllImport("user32.dll", SetLastError = true)]
+        public static extern IntPtr SetFocus(IntPtr hWnd);
+
+        [DllImport("user32.dll", SetLastError = true)]
+        public static extern bool BringWindowToTop(IntPtr hWnd);
+
+        [DllImport("user32.dll")]
+        public static extern bool IsZoomed(IntPtr hWnd);
+
         #endregion
 
         #region gdi32.dll

PiP-Tool/Resources/Strings/StringResources.xaml

@@ -7,4 +7,5 @@
     <system:String x:Key="Quit">Quit</system:String>
     <system:String x:Key="SelectNewWindow">Select a new window</system:String>
     <system:String x:Key="SetVolume">Adjust Volume</system:String>
+    <system:String x:Key="SwitchToSelectedWindow">Switch to selected window and minimize PiP"</system:String> 
 </ResourceDictionary>

PiP-Tool/ViewModels/PiPModeViewModel.cs

@@ -58,6 +58,7 @@ public string Title
         public ICommand ClosingCommand { get; }
         public ICommand ChangeSelectedWindowCommand { get; }
         public ICommand SetVolumeCommand { get; }
+        public ICommand SwitchToSelectedWindowCommand { get; }
         public ICommand MouseEnterCommand { get; }
         public ICommand MouseLeaveCommand { get; }
         public ICommand DpiChangedCommand { get; }
@@ -203,6 +204,7 @@ public PiPModeViewModel()
             ClosingCommand = new RelayCommand(ClosingCommandExecute);
             ChangeSelectedWindowCommand = new RelayCommand(ChangeSelectedWindowCommandExecute);
             SetVolumeCommand = new RelayCommand<object>(SetVolumeCommandExecute);
+            SwitchToSelectedWindowCommand = new RelayCommand(SwitchToSelectedWindowCommandExecute);
             MouseEnterCommand = new RelayCommand<MouseEventArgs>(MouseEnterCommandExecute);
             MouseLeaveCommand = new RelayCommand<MouseEventArgs>(MouseLeaveCommandExecute);
             DpiChangedCommand = new RelayCommand(DpiChangedCommandExecute);
@@ -507,6 +509,27 @@ private double GetWindowTop(Window window)
                 return window.Top;
         }
 
+
+        /// <summary>
+        /// Executed on click on set volume button. Opens <see cref="VolumeDialog"/>
+        /// </summary>
+        private void SwitchToSelectedWindowCommandExecute()
+        {
+            var thisWindow = ThisWindow();
+            var selectedHandle = this._selectedWindow.WindowInfo.Handle;
+
+            NativeMethods.ShowWindow(
+                selectedHandle,
+                NativeMethods.IsZoomed(selectedHandle) ? ShowWindowCommands.ShowMaximized : ShowWindowCommands.Restore
+            );
+            NativeMethods.SetForegroundWindow(selectedHandle);
+            NativeMethods.SetActiveWindow(selectedHandle);
+            NativeMethods.BringWindowToTop(selectedHandle);
+            NativeMethods.SetFocus(selectedHandle);
+            NativeMethods.SwitchToThisWindow(selectedHandle, true);
+            SystemCommands.MinimizeWindow(thisWindow);
+        }
+
         /// <summary>
         /// Executed on click on set volume button. Opens <see cref="VolumeDialog"/>
         /// </summary>

PiP-Tool/Views/PiPModeWindow.xaml

@@ -54,6 +54,16 @@
             Orientation="Horizontal" 
             HorizontalAlignment="Right"
          >
+            <Button HorizontalAlignment="Left" 
+                    x:Name="SwitchToSelectedWindowButton" 
+                    ToolTip="{StaticResource SwitchToSelectedWindow}"
+                    VerticalAlignment="Top" 
+                    Command="{Binding SwitchToSelectedWindowCommand}" 
+                    Height="30" 
+                    Width="30" 
+                    BorderBrush="#FF7C7C7C"
+                    Opacity="0.5"
+                    FontFamily="/PiP-Tool;component/Assets/#Flaticon" Content="&#128468;" Foreground="White" />
             <Button HorizontalAlignment="Left" 
                     x:Name="VolumeButton" 
                     ToolTip="{StaticResource SetVolume}"