所以，我们认为在我们的聊天应用程序中添加某种Toast功能是一个好主意，实际上它工作得很好，但是，当表单显示时，它会将焦点转移到breif秒，这可以使聊天输入框（当你输入它时）闪烁或清除所有文本（因为焦点被偷走了）。
我已经回顾了这个网站上的几个主题，关于如何通过覆盖createparms甚至执行showwithoutactivating或其他一些内容来阻止它发生，但它的工作不正常。
这就是我所拥有的（我为所有评论道歉，我们的老板想要记录所有内容）：
public partial class ToastForm : DevComponents.DotNetBar.Metro.MetroForm
{
#region Variables
private readonly int _location;
/// <summary>
/// The list of currently open ToastForms.
/// </summary>
private static readonly List<ToastForm> OpenForms = new List<ToastForm>();
/// <summary>
/// Set the window to top most
/// </summary>
private const int WsExTopmost = 0x00000008;
#endregion // Variables
#region Constructors
/// <summary>
/// Creates a new ToastForm object that is displayed for the specified length of time.
/// </summary>
/// <param name="lifeTime">
/// The length of time, in milliseconds, that the form will be displayed.
/// </param>
/// <param name="title">title of tooltip</param>
/// <param name="message">message for tooltip</param>
/// <param name="location">Location: 0 = top left, 1 = top right, 2 = bottom left, 3 = bottom right</param>
public ToastForm(int lifeTime,
string title,
string message,
int location)
{
InitializeComponent();
// Set the time for which the form should be displayed and the message to display.
lifeTimer.Interval = lifeTime;
tooltipTitle.Text =
string.Format("<b><font size=\"+6\"><i>New</i><font color=\"#B02B2C\">{0}</font></font></b>",
title);
tooltipText.Text = message;
_location = location;
}
/// <summary>
/// Do not activate the window just show it
/// </summary>
protected override bool ShowWithoutActivation
{
get { return true; }
}
/// <summary>
/// Force the ExStyle to be TopMost
/// </summary>
protected override CreateParams CreateParams
{
get
{
var param = base.CreateParams;
param.ExStyle |= WsExTopmost; // make the form topmost
return param;
}
}
#endregion // Constructors
#region Event Handlers
/// <summary>
/// Do this when the form loads
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ToastFormLoad(object sender,
EventArgs e)
{
switch (_location)
{
case 0: // top left corner of screen
Location = new Point(0,
0);
break;
case 1: // top right corner of screen
Location = new Point(Screen.PrimaryScreen.WorkingArea.Width - Width - 5,
0);
break;
case 2: // bottom left corner of screen
Location = new Point(0,
Screen.PrimaryScreen.WorkingArea.Height - Height - 5);
break;
case 3: // bottom right corner of screen
Location = new Point(Screen.PrimaryScreen.WorkingArea.Width - Width - 5,
Screen.PrimaryScreen.WorkingArea.Height - Height - 5);
break;
}
// Move each open form upwards to make room for this one.
foreach (var openForm in OpenForms)
{
switch (_location)
{
case 0:
case 1:
openForm.Top += Height + 5;
break;
case 2:
case 3:
openForm.Top -= Height + 5;
break;
}
}
OpenForms.Add(this);
lifeTimer.Start();
}
/// <summary>
/// Happens when the form closes
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ToastFormFormClosed(object sender,
FormClosedEventArgs e)
{
// Move down any open forms above this one.
foreach (var openForm in OpenForms.TakeWhile(openForm => openForm != this))
{
switch (_location)
{
case 0:
openForm.Top -= Height + 5;
break;
case 1:
openForm.Top -= Height + 5;
break;
case 2:
openForm.Top += Height + 5;
break;
case 3:
openForm.Top += Height + 5;
break;
}
}
// Remove this form from the open form list.
OpenForms.Remove(this);
}
/// <summary>
/// If the tooltip has expired
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void LifeTimerTick(object sender,
EventArgs e)
{
// The form's lifetime has expired.
Close();
}
#endregion // Event Handlers
#region Methods
/// <summary>
/// Quickly close the tooltip
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void TooltipCancelClick(object sender,
EventArgs e)
{
lifeTimer.Interval = 1;
}
#endregion
}
我们根据主窗体中的事件触发这些弹出窗口（例如，当新的公共消息进入时，通过引用另一个类中的命令（在我们的主窗体的类中节省空间）：
class ToastControl
{
public static int SliceCount { get; private set; }
internal static void ShowAlert(string msg, string title, Font fnt)
{
switch (Settings.Default.PopUpSide)
{
case 0:
AlertTopLeft(msg, title, fnt);
break;
case 1:
AlertTopRight(msg, title, fnt);
break;
case 2:
AlertBottomLeft(msg, title, fnt);
break;
case 3:
AlertBottomRight(msg, title, fnt);
break;
default:
AlertBottomRight(msg, title, fnt);
break;
}
}
internal static void AlertBottomRight(string msg, string title, Font fnt)
{
SliceCount += 1;
var slice = new ToastForm(5000,
title,
msg, 3)
{
Height = (25 + 82) + ((int)(msg.Length / fnt.Size)) * 2
};
slice.Show();
}
internal static void AlertBottomLeft(string msg, string title, Font fnt)
{
SliceCount += 1;
var slice = new ToastForm(5000,
title,
msg,
2)
{
Height = (25 + 82) + ((int)(msg.Length / fnt.Size)) * 2
};
slice.Show();
}
internal static void AlertTopLeft(string msg, string title, Font fnt)
{
SliceCount += 1;
var slice = new ToastForm(5000,
title,
msg, 0)
{
Height = (25 + 82) + ((int)(msg.Length / fnt.Size)) * 2
};
slice.Show();
}
internal static void AlertTopRight(string msg, string title, Font fnt)
{
SliceCount += 1;
var slice = new ToastForm(5000,
title,
msg, 1)
{
Height = (25 + 82) + ((int)(msg.Length / fnt.Size)) * 2
};
slice.Show();
}
}
这个类的调用示例：
if (Settings.Default.PopUpEnabledChat)
{
if (!(Settings.Default.NoAlerts))
ToastControl.ShowAlert(string.Format("{0}: {1}", user.Nick, description.Replace("\r",
"").Replace("\n",
"").Replace("\0",
"")), channel, Font);
}
如何在不从主应用程序中窃取焦点的情况下显示此通知表单？
答案 0 :(得分：6)
看起来解决方案是做我做的几乎所有，除了我需要在通知表单中添加以下内容：
/// <summary>
/// Do not activate the window just show it
/// </summary>
protected override bool ShowWithoutActivation
{
get { return true; }
}
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.ExStyle |= 0x00000008; //WS_EX_TOPMOST
return cp;
}
}
并将Toast Control类改为使用'Visible'而不是'.Show'：
internal static void AlertBottomRight(string msg, string title, Font fnt)
{
SliceCount += 1;
new ToastForm(5000,
title,
msg,
3) {
Height = (25 + 82) + ((int) (msg.Length / fnt.Size)) * 2,
Visible = true
};
}
internal static void AlertBottomLeft(string msg, string title, Font fnt)
{
SliceCount += 1;
new ToastForm(5000,
title,
msg,
2) {
Height = (25 + 82) + ((int) (msg.Length / fnt.Size)) * 2,
Visible = true
};
}
internal static void AlertTopLeft(string msg, string title, Font fnt)
{
SliceCount += 1;
new ToastForm(5000,
title,
msg,
0) {
Height = (25 + 82) + ((int) (msg.Length / fnt.Size)) * 2,
Visible = true
};
}
internal static void AlertTopRight(string msg, string title, Font fnt)
{
SliceCount += 1;
new ToastForm(5000,
title,
msg,
1) {
Height = (25 + 82) + ((int) (msg.Length / fnt.Size)) * 2,
Visible = true
};
}
现在，当显示通知时，它们不会窃取焦点，并且它们在其他窗口的顶部看起来很好:)