Export (0) Print
Expand All
Expand Minimize
0 out of 1 rated this helpful - Rate this topic

Control.OnMouseHover Method

Raises the MouseHover event.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

'Declaration
Protected Overridable Sub OnMouseHover ( _
	e As EventArgs _
)
'Usage
Dim e As EventArgs

Me.OnMouseHover(e)
protected void OnMouseHover (
	EventArgs e
)
protected function OnMouseHover (
	e : EventArgs
)

Parameters

e

An EventArgs that contains the event data.

Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.

The OnMouseHover 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 OnMouseHover in a derived class, be sure to call the base class's OnMouseHover method so that registered delegates receive the event.

The following code example demonstrates how to override the OnMouseHover 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 curser the Hand curser when the mouse moves 
        ' over the button.
        Cursor = Cursors.Hand

        ' Call MyBase.OnMouseHover to activate the delegate.
        MyBase.OnMouseHover(e)
    End Sub

public class FunButton extends Button
{
    protected void OnMouseHover(System.EventArgs e)
    {
        // Get the font size in Points, add one to the
        // size, and reset the button's font to the larger
        // size.
        float fontSize = get_Font().get_SizeInPoints();
        fontSize += 1;
        System.Drawing.Size buttonSize = get_Size();
        this.set_Font(new System.Drawing.Font(get_Font().get_FontFamily(), 
            fontSize, get_Font().get_Style()));
        // Increase the size width and height of the button 
        // by 5 points each.
        set_Size(new System.Drawing.Size(get_Size().get_Width() + 5, 
            get_Size().get_Height() + 5));
        // Call myBase.OnMouseHover to activate the delegate.
        super.OnMouseHover(e);
    } //OnMouseHover

    protected void OnMouseMove(MouseEventArgs e)
    {
        // Make the curser the Hand curser when the mouse moves 
        // over the button.
        set_Cursor(Cursors.get_Hand());
        // Call MyBase.OnMouseHover to activate the delegate.
        super.OnMouseHover(e);
    } //OnMouseMove

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0
Did you find this helpful?
(1500 characters remaining)
Thank you for your feedback

Community Additions

ADD
Show:
© 2014 Microsoft. All rights reserved.