MouseOver event code

[seaweed]

I finally came up with a solution to a problem that someone posted, but I can't find them now. He wanted to have a control (an image, I think) change whenever the mouse was over it, then change back when the mouse left it. Here is code that creates a "MouseOver" event for any control on your form.

Paste the following into a standard module:

Option Explicit

Type POINTAPI
    X As Long
    Y As Long
End Type

Type RECT
    Left As Long
    Top As Long
    Right As Long
    Bottom As Long
End Type

Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long

Private Function GetControlRect(ControlIn As Control, FormIn As Form) As RECT
    GetControlRect.Left = (ControlIn.Left + FormIn.Left + 50) / _
        Screen.TwipsPerPixelX
    GetControlRect.Right = (ControlIn.Left + FormIn.Left + _
        ControlIn.Width + 50) / Screen.TwipsPerPixelX
    GetControlRect.Top = (ControlIn.Top + FormIn.Top + 325) / _
        Screen.TwipsPerPixelY
    GetControlRect.Bottom = (ControlIn.Top + FormIn.Top + _
        325 + ControlIn.Height) / Screen.TwipsPerPixelY
End Function

Public Function MouseOver(ControlIn As Control, FormIn As Form) As Boolean
    Dim CursorPos As POINTAPI
    Dim ControlRect As RECT

    GetCursorPos CursorPos
    ControlRect = GetControlRect(ControlIn, FormIn)
    
    If CursorPos.X > ControlRect.Left And _
        CursorPos.X < ControlRect.Right And _
        CursorPos.Y > ControlRect.Top And _
        CursorPos.Y < ControlRect.Bottom Then
            MouseOver = True
    Else
        MouseOver = False
    End If
End Function

Usage (Probably best used in a timer):

If MouseOver(ControlName, FormName) then
'Highlight control here
Else
'Unhighlight control here
End If

Example:
Place a timer, a picturebox, and two labels on a form (make sure the timer's Interval property is set to 10 or less for a quick response time). Then place the following code in the form's code window:

Option Explicit

Private Sub Timer1_Timer()
    If MouseOver(Label1, Me) Then
        Label2 = "You're over the label"
    ElseIf MouseOver(Picture1, Me) Then
        Label2 = "You're over the picture"
    Else
        Label2 = "You aren't over any controls"
    End If
End Sub

Hope that helps!

~seaweed

Edited by seaweed on 02-23-2000 at 04:56 PM

[jesus4u]

Originally posted by seaweed
I finally came up with a solution to a problem that someone posted, but I can't find them now. He wanted to have a control (an image, I think) change whenever the mouse was over it, then change back when the mouse left it. Here is code that creates a "MouseOver" event for any control on your form.

Paste the following into a standard module:

Option Explicit

Type POINTAPI
    X As Long
    Y As Long
End Type

Type RECT
    Left As Long
    Top As Long
    Right As Long
    Bottom As Long
End Type

Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long

Private Function GetControlRect(ControlIn As Control, FormIn As Form) As RECT
    GetControlRect.Left = (ControlIn.Left + FormIn.Left + 50) / _
        Screen.TwipsPerPixelX
    GetControlRect.Right = (ControlIn.Left + FormIn.Left + _
        ControlIn.Width + 50) / Screen.TwipsPerPixelX
    GetControlRect.Top = (ControlIn.Top + FormIn.Top + 325) / _
        Screen.TwipsPerPixelY
    GetControlRect.Bottom = (ControlIn.Top + FormIn.Top + _
        325 + ControlIn.Height) / Screen.TwipsPerPixelY
End Function

Public Function MouseOver(ControlIn As Control, FormIn As Form) As Boolean
    Dim CursorPos As POINTAPI
    Dim ControlRect As RECT

    GetCursorPos CursorPos
    ControlRect = GetControlRect(ControlIn, FormIn)
    
    If CursorPos.X > ControlRect.Left And _
        CursorPos.X < ControlRect.Right And _
        CursorPos.Y > ControlRect.Top And _
        CursorPos.Y < ControlRect.Bottom Then
            MouseOver = True
    Else
        MouseOver = False
    End If
End Function

Usage (Probably best used in a timer):

If MouseOver(ControlName, FormName) then
'Highlight control here
Else
'Unhighlight control here
End If

Example:
Place a timer, a picturebox, and two labels on a form (make sure the timer's Interval property is set to 10 or less for a quick response time). Then place the following code in the form's code window:

Option Explicit

Private Sub Timer1_Timer()
    If MouseOver(Label1, Me) Then
        Label2 = "You're over the label"
    ElseIf MouseOver(Picture1, Me) Then
        Label2 = "You're over the picture"
    Else
        Label2 = "You aren't over any controls"
    End If
End Sub

Hope that helps!

~seaweed

Edited by seaweed on 02-23-2000 at 04:56 PM

I tried to use your code for a lable control but all it did was always return a false return for the MouseOver function..

[Mc Brain]

That's not the way to do it.

http://forums.vb-world.net/showthrea...ght=setcapture

This is the best way I know to create a "rollover image" effect. The "how" you load the new image is up to you, there are several different way to do it: Loadpicture, a picture array, an ImageList, whatever. But the essence of the effect is shown in this code:

Private Declare Function ReleaseCapture Lib "user32" () As Long
Private Declare Function SetCapture Lib "user32" (ByVal hwnd As Long) As Long
 
Private Sub Picture1_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
    With Picture1
        If (X < 0) Or (Y < 0) Or (X > .Width) Or (Y > .Height) Then
            ReleaseCapture
            .Picture = RollOver(0).Picture
        Else
            SetCapture .hwnd
            .Picture = RollOver(1).Picture
        End If
    End With
    
End Sub

The PictureBox RollOver is an array, but you can use whateve method you like to load one or other image.

[jesus4u]

thank you very much. Can u tell me how to change the mouse's icon when I do this effect?
thanks

[Mc Brain]

Screen.MouseIcon = vbCustom
    Screen.MousePointer = Pictture1.Picture

[MrPolite]

also try the WindowFromPointer API, it returns the handle of the control that the mouse pointer is over it. You can make a timer and check to see if the mouse is over the picturebox (if the function returns the same hWnd as the picturebox's). I'm not sure if Picture_mousemove works always

[jesus4u]

if I use this in my code

Label3.ForeColor = vbBlue
    Me.MouseIcon = LoadPicture("C:\Program Files\Microsoft Visual Studio\Common\Graphics\Cursors\H_POINT.CUR")
    Me.MousePointer = vbCustom

when I distribute how will the APP know where to find the path to the icon or is there a better way?

[Mc Brain]

Originally posted by jesus4u
if I use this in my code

Label3.ForeColor = vbBlue
    Me.MouseIcon = LoadPicture("C:\Program Files\Microsoft Visual Studio\Common\Graphics\Cursors\H_POINT.CUR")
    Me.MousePointer = vbCustom

when I distribute how will the APP know where to find the path to the icon or is there a better way?

It would look in the path you're saying in the code. So, if the user doens't get the path, or the cursor in that folder, you're app will raise an error.

[jesus4u]

Originally posted by Mc Brain


It would look in the path you're saying in the code. So, if the user doens't get the path, or the cursor in that folder, you're app will raise an error.

Would it be better to place the icon in the same folder as the app then?

[Mc Brain]

Sure, but you'll have to package it and installed it on the user's folders.

[jesus4u]

is there any simpler way than that?

[Mc Brain]

The simpler way is this, Just load the Picture in the MouseIcon property in design time, and forget about it.