How to make a WPF Window to blink on the taskbar?

Question

A given moment my WPF app needs user attention. I know it is possible to make the Windows 7 taskbar icon to flash with a yellow color.

I tried so far:

• Window.Activate Attempts to bring the window to the foreground and activates it.
• Window.Focus Attempts to set focus to this element.

Any suggestions?

Answer 1

Here's one possible solution: http://www.jarloo.com/flashing-a-wpf-window/

In the code sample, two extensions methods are created for the Window class: FlashWindow and StopFlashingWindow:

private const UInt32 FLASHW_STOP = 0; //Stop flashing. The system restores the window to its original state.        private const UInt32 FLASHW_CAPTION = 1; //Flash the window caption.         private const UInt32 FLASHW_TRAY = 2; //Flash the taskbar button.         private const UInt32 FLASHW_ALL = 3; //Flash both the window caption and taskbar button.         private const UInt32 FLASHW_TIMER = 4; //Flash continuously, until the FLASHW_STOP flag is set.         private const UInt32 FLASHW_TIMERNOFG = 12; //Flash continuously until the window comes to the foreground.     [StructLayout(LayoutKind.Sequential)]         private struct FLASHWINFO         {                 public UInt32 cbSize; //The size of the structure in bytes.                 public IntPtr hwnd; //A Handle to the Window to be Flashed. The window can be either opened or minimized.       public UInt32 dwFlags; //The Flash Status.                 public UInt32 uCount; // number of times to flash the window                 public UInt32 dwTimeout; //The rate at which the Window is to be flashed, in milliseconds. If Zero, the function uses the default cursor blink rate.         }           [DllImport("user32.dll")]         [return: MarshalAs(UnmanagedType.Bool)]         private static extern bool FlashWindowEx(ref FLASHWINFO pwfi);             public static void FlashWindow(this Window win, UInt32 count = UInt32.MaxValue)         {                 //Don't flash if the window is active                 if (win.IsActive) return;                  WindowInteropHelper h = new WindowInteropHelper(win);                  FLASHWINFO info = new FLASHWINFO      {                                                 hwnd = h.Handle,                                                 dwFlags = FLASHW_ALL | FLASHW_TIMER,                                                 uCount = count,                                                 dwTimeout = 0                                         };                   info.cbSize = Convert.ToUInt32(Marshal.SizeOf(info));                 FlashWindowEx(ref info);         }   public static void StopFlashingWindow(this Window win)         {                 WindowInteropHelper h = new WindowInteropHelper(win);                  FLASHWINFO info = new FLASHWINFO();                 info.hwnd = h.Handle;                 info.cbSize = Convert.ToUInt32(Marshal.SizeOf(info));                 info.dwFlags = FLASHW_STOP;                 info.uCount = UInt32.MaxValue;                 info.dwTimeout = 0;                  FlashWindowEx(ref info);         } 

Visit http://www.jarloo.com/flashing-a-wpf-window/ for the complete source.

Pretty interesting scenario. I would have thought it would be something simple. I'll have bookmark this question in the event I ever have to do something similar :)