Raises the MouseHover event.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.
The method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.Notes to Inheritors:
When overriding in a derived class, be sure to call the base class's method so that registered delegates receive the event.
The following code example demonstrates how to override the and OnMouseMove methods in a derived class. To run the example, paste the following code in a new form and paste this class, forming the same file, after the form. Add a button of type FunButton to the form.
Public Class FunButton Inherits Button Protected Overrides Sub OnMouseHover(ByVal e As System.EventArgs) ' Get the font size in Points, add one to the ' size, and reset the button's font to the larger ' size. Dim fontSize As Single = Font.SizeInPoints fontSize += 1 Dim buttonSize As System.Drawing.Size = Size Me.Font = New System.Drawing.Font _ (Font.FontFamily, fontSize, Font.Style) ' Increase the size width and height of the button ' by 5 points each. Size = New System.Drawing.Size _ (Size.Width + 5, Size.Height + 5) ' Call myBase.OnMouseHover to activate the delegate. MyBase.OnMouseHover(e) End Sub Protected Overrides Sub OnMouseMove(ByVal e As MouseEventArgs) ' Make the cursor the Hand cursor when the mouse moves ' over the button. Cursor = Cursors.Hand ' Call MyBase.OnMouseMove to activate the delegate. MyBase.OnMouseMove(e) End Sub
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.