ASP.NET Custom Server Controls: Cute ToolTip Control - What is the ToolTip Designer class?
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That is a special type of class, which gets executed when the control is about to be rendered only at design time. Here it makes sense to use it, as there exists no involvement of design-time properties to be set. It is defined something like the following:
Public Class ToolTipDesigner
Inherits System.Web.UI.Design.ControlDesigner
Public Overrides Function GetDesignTimeHtml() As String
Return "You will be able to see the tooltips only at
runtime"
End Function
End Class
The method “GetDesignTimeHtml” gets executed when our tooltip control is dragged from the toolbox onto the web page at design time. As the control does nothing here and it does not have any properties, we simply return a message.
This class (“ToolTipDesigner”) gets linked to our control with the “<Designer>” attribute at class level. The class declaration of our ToolTip control would be something like the following:
<Designer(GetType(ToolTipDesigner)), DefaultProperty("Text"),
ToolboxData("<{0}:ToolTip runat=server></{0}:ToolTip>")> Public
Class ToolTip
Inherits System.Web.UI.WebControls.WebControl
That finishes our matter. I leave it to the developers to further enhance the same control. The areas of improving the same control would include eventing, better JavaScript, data-binding, cross browser support, and so on. Good luck.
Any comments, suggestions, bugs, errors, feedback etc. are highly appreciated at jag_chat@yahoo.com.
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