如何让WPF窗口在任务栏上闪烁？

Question

在给定的时刻,我的WPF应用程序需要用户注意.我知道可以使Windows 7任务栏图标以黄色闪烁.

我到目前为止尝试过:

• Window.Activate 尝试将窗口置于前台并激活它.
• Window.Focus 尝试将焦点设置为此元素.

有什么建议？

Answer 1

这是一个可能的解决方案:http://www.jarloo.com/flashing-a-wpf-window/

在代码示例中,为Window类创建了两个扩展方法:FlashWindow和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);        
}

访问http://www.jarloo.com/flashing-a-wpf-window/获取完整资料.

非常有趣的场景.我原本以为这会很简单.如果我不得不做类似的事情,我会给这个问题添加书签:)

Answer 2

最好使用专为此目的设计的Windows 7功能 - 任务栏覆盖图标.http://10rem.net/blog/2009/12/09/overlaying-icons-on-the-windows-7-taskbar-with-wpf-4是您可以看到如何做到这一点的众多地方之一.

如果需要注意作为长时间运行过程的一部分,我将使用任务栏进度条覆盖(在WPF中也很容易)并将其状态从Normal更改为Paused或Error,分别显示为黄色和红色.这将引起用户的注意.

Answer 3

斯科特的例子要简单得多……谢谢斯科特！

https://scottstoecker.wordpress.com/2010/10/08/creating-a-flashing-taskbar-icon-using-flashwindow-with-xaml/

using System.Windows.Interop;
using System.Runtime.InteropServices;

[DllImport("user32")] public static extern int FlashWindow(IntPtr hwnd, bool bInvert);

WindowInteropHelper wih = new WindowInteropHelper(ThisWindow); 
FlashWindow(wih.Handle, true);

Answer 4

根据凯特的建议，我使用了这样的任务栏进度：

XAML：

<Window.TaskbarItemInfo>
   <TaskbarItemInfo x:Name="taskBarItem"/>
</Window.TaskbarItemInfo>

CS：

taskBarItem.ProgressState = System.Windows.Shell.TaskbarItemProgressState.Indeterminate;

这使得任务栏图标呈绿色闪烁，这对于我的用例来说足以让用户关注长时间运行的应用程序。