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Let Users Resize Your Controls

Let Users Resize Your Controls

You can allow users to resize a control?just like in VB design mode?with a mouse, using two simple API calls. You can resize the control?top-left, top, top-right, left, right, bottom-left, bottom, and right. When you make ranges for the mouse coordinates (such as x>0 and x<100), the MouseDown event activates the API functions and sizes your picture box when the mouse moves. This code assumes you have a picture box on the form:

 Private Declare Function ReleaseCapture Lib _	"user32" () As LongPrivate Declare Function SendMessage Lib _	"user32" Alias "SendMessageA" (ByVal hWnd _	As Long, ByVal wMsg As Long, ByVal wParam _	As Long, lParam As Any) As LongPrivate Const WM_NCLBUTTONDOWN = &HA1' You can find more of these (lower) in the API Viewer. Here ' they are used only for resizing the left and right.Private Const HTLEFT = 10Private Const HTRIGHT = 11Private Sub Picture1_MouseDown(Button As _	Integer, Shift As Integer, X As Single, Y As Single)	Dim nParam As Long	With Picture1		' You can change these coordinates to whatever 		' you want		If (X > 0 And X < 100) Then			nParam = HTLEFT		ElseIf (X > .Width - 100 And X < .Width) Then 		' these too			nParam = HTRIGHT		End If		If nParam Then			Call ReleaseCapture			Call SendMessage(.hWnd, _				WM_NCLBUTTONDOWN, nParam, 0)		End If	End WithEnd SubPrivate Sub Picture1_MouseMove(Button As _	Integer, Shift As Integer, X As Single, Y As Single)	Dim NewPointer As MousePointerConstants	' You can change these coordinates to whatever you want	If (X > 0 And X < 100) Then		NewPointer = vbSizeWE	ElseIf (X > Picture1.Width - 100 And X < _		Picture1.Width) Then ' these too		NewPointer = vbSizeWE	Else		NewPointer = vbDefault	End If	If NewPointer <> Picture1.MousePointer Then		Picture1.MousePointer = NewPointer	End IfEnd Sub
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