by Matthew Gates (16 Submissions)
Category: Custom Controls/Forms/Menus
Compatability: Visual Basic 3.0
Difficulty: Unknown Difficulty
Originally Published: Wed 1st November 2000
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
Code makes it so that a form cannot go off the screen.
API Declarations
Public Declare Sub ReleaseCapture Lib "user32" ()
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
VBcoders
'Makes it where your form cant go off the screen
ReleaseCapture
SendMessage frm.hwnd, &H112, &HF012, 0
frm.Refresh
If frm.Left < 0 Then 'left side of screen
frm.Left = 0
If frm.Top < 0 Then
frm.Top = 0
ElseIf frm.Top > Screen.Height - frm.Height Then
frm.Top = Screen.Height - frm.Height
End If
ElseIf frm.Top < 0 Then 'top of screen
frm.Top = 0
If frm.Left < 0 Then
frm.Top = 0
ElseIf frm.Left > Screen.Width - frm.Width Then
Timer1.Enabled = True
frm.Left = Screen.Width - frm.Width
End If
ElseIf frm.Left > Screen.Width - frm.Width Then 'right of screen
frm.Left = Screen.Width - frm.Width
If frm.Top < 0 Then
frm.Top = 0
ElseIf frm.Top > Screen.Height - frm.Height Then
frm.Top = Screen.Height - frm.Height
End If
ElseIf frm.Top > Screen.Height - frm.Height Then 'bottom of screen
frm.Top = Screen.Height - frm.Height
If frm.Left < 0 Then
frm.Top = 0
ElseIf frm.Left > Screen.Width - frm.Width Then
frm.Left = Screen.Width - frm.Width
End If
End If
End Sub
