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Public Class clsResizeControl
Private WithEvents mControl As Control
Private WithEvents mOwnerForm As Form
Private GRS As Integer = 6
Private InResizeMode As Boolean = False
Private MoveControl As Boolean = False
Private LastMousePos As Point
Private mMinWidth As Integer = 20
Private mMinHeigth As Integer = 20
Public GrabRectColor As Color = Color.Yellow
Private GrabRects() As Control = { _
New Control, _
New Control, _
New Control, _
New Control, _
New Control, _
New Control, _
New Control, _
New Control}
''' <summary>
''' Diese Routine muss aufgerufen werden wenn man die Resize-Funktionalität vom Control entfernen möchte.
''' </summary>
Public Sub Finish()
RemoveHandler mOwnerForm.Paint, AddressOf Paint
RemoveHandler mControl.MouseDown, AddressOf ControlMouseDown
RemoveHandler mControl.MouseMove, AddressOf ControlMouseMove
RemoveHandler mControl.MouseUp, AddressOf ControlMouseUp
For i As Integer = 0 To GrabRects.Length - 1
RemoveHandler GrabRects(i).Paint, AddressOf GrabRectPaint
RemoveHandler GrabRects(i).MouseClick, AddressOf GrabRectMouseClick
RemoveHandler GrabRects(i).MouseMove, AddressOf GrabRectMouseMove
RemoveHandler GrabRects(i).MouseDown, AddressOf GrabRectMouseDown
RemoveHandler GrabRects(i).MouseUp, AddressOf GrabRectMouseUp
RemoveHandler GrabRects(i).Move, AddressOf GrabRectMove
GrabRects(i).Dispose()
Next
GrabRects = Nothing
mOwnerForm.Refresh()
End Sub
Sub New(ByVal NewControl As Control, ByVal OwnerForm As Form)
mControl = NewControl
mOwnerForm = OwnerForm
AddHandler mOwnerForm.Paint, AddressOf Paint
AddHandler mControl.MouseDown, AddressOf ControlMouseDown
AddHandler mControl.MouseMove, AddressOf ControlMouseMove
AddHandler mControl.MouseUp, AddressOf ControlMouseUp
mControl.Cursor = Cursors.SizeAll
For i As Integer = 0 To GrabRects.Length - 1
AddHandler GrabRects(i).Paint, AddressOf GrabRectPaint
AddHandler GrabRects(i).MouseClick, AddressOf GrabRectMouseClick
AddHandler GrabRects(i).MouseMove, AddressOf GrabRectMouseMove
AddHandler GrabRects(i).MouseDown, AddressOf GrabRectMouseDown
AddHandler GrabRects(i).MouseUp, AddressOf GrabRectMouseUp
AddHandler GrabRects(i).Move, AddressOf GrabRectMove
Next
mOwnerForm.Refresh()
End Sub
Private Sub ControlMouseDown(ByVal sender As Object, ByVal e As MouseEventArgs)
MoveControl = True
LastMousePos = New Point(e.X, e.Y)
For i As Integer = 0 To GrabRects.Length - 1
GrabRects(i).Visible = False
Next
mOwnerForm.Refresh()
End Sub
Private Sub ControlMouseMove(ByVal sender As Object, ByVal e As MouseEventArgs)
If MoveControl = True Then
mControl.Left = mControl.Left + e.X - LastMousePos.X
mControl.Top = mControl.Top + e.Y - LastMousePos.Y
mOwnerForm.Refresh()
End If
End Sub
Private Sub ControlMouseUp(ByVal sender As Object, ByVal e As MouseEventArgs)
MoveControl = False
For i As Integer = 0 To GrabRects.Length - 1
GrabRects(i).Visible = True
Next
mOwnerForm.Refresh()
End Sub
Public Sub Paint(ByVal sender As Object, ByVal e As PaintEventArgs)
If InResizeMode = True Or MoveControl = True Then Exit Sub
With e.Graphics
'Rahmen
.DrawRectangle(Pens.Gray, New Rectangle( _
mControl.Location.X - (GRS / 2), _
mControl.Location.Y - (GRS / 2), _
mControl.Width + GRS, _
mControl.Height + GRS))
'Positionen für die GrabRects in der Reihenfolge:
'TopLeft, TopMiddle, TopRight, MiddleLeft, MiddleRight, BottomLeft,BottomMiddle,BottomRight
Dim GrabRectPos() As Point = { _
New Point(mControl.Location.X - GRS, mControl.Location.Y - GRS), _
New Point(mControl.Location.X + (mControl.Width / 2) - (GRS / 2), mControl.Location.Y - GRS), _
New Point(mControl.Location.X + mControl.Width, mControl.Location.Y - GRS), _
New Point(mControl.Location.X - GRS, mControl.Location.Y + (mControl.Height / 2) - (GRS / 2)), _
New Point(mControl.Location.X + (mControl.Width), mControl.Location.Y + (mControl.Height / 2) - (GRS / 2)), _
New Point(mControl.Location.X - GRS, mControl.Location.Y + (mControl.Height)), _
New Point(mControl.Location.X + (mControl.Width / 2) - (GRS / 2), mControl.Location.Y + (mControl.Height)), _
New Point(mControl.Location.X + mControl.Width, mControl.Location.Y + (mControl.Height))}
For i As Integer = 0 To GrabRects.Length - 1
GrabRects(i).Location = GrabRectPos(i)
GrabRects(i).Size = New Size(GRS, GRS)
GrabRects(i).BackColor = Color.White
GrabRects(i).Parent = mOwnerForm
Next
GrabRects(4).BackColor = GrabRectColor
GrabRects(6).BackColor = GrabRectColor
GrabRects(7).BackColor = GrabRectColor
End With
End Sub
Private Sub GrabRectPaint(ByVal sender As Object, ByVal e As PaintEventArgs)
e.Graphics.DrawRectangle(Pens.Black, New Rectangle(0, 0, GRS - 1, GRS - 1))
End Sub
Private Sub GrabRectMove(ByVal sender As Object, ByVal e As System.EventArgs)
Dim CurrControl As Control = CType(sender, Control)
Dim Index As Integer = GetCurrIndex(sender)
End Sub
Private Sub GrabRectMouseClick(ByVal sender As Object, ByVal e As MouseEventArgs)
Dim CurrControl As Control = CType(sender, Control)
Dim Index As Integer = GetCurrIndex(sender)
End Sub
Private Sub GrabRectMouseMove(ByVal sender As Object, ByVal e As MouseEventArgs)
Dim CurrControl As Control = CType(sender, Control)
Dim Index As Integer = GetCurrIndex(sender)
Dim MousePos As Point
Static Right As Integer
Static Bottom As Integer
Select Case Index
Case 0 : CurrControl.Cursor = Cursors.SizeNWSE
Case 1 : CurrControl.Cursor = Cursors.SizeNS
Case 2 : CurrControl.Cursor = Cursors.SizeNESW
Case 3 : CurrControl.Cursor = Cursors.SizeWE
Case 4 : CurrControl.Cursor = Cursors.SizeWE
Case 5 : CurrControl.Cursor = Cursors.SizeNESW
Case 6 : CurrControl.Cursor = Cursors.SizeNS
Case 7 : CurrControl.Cursor = Cursors.SizeNWSE
End Select
If InResizeMode = True Then
MousePos = mOwnerForm.PointToClient(Cursor.Position)
CurrControl.Left = mOwnerForm.PointToClient(Cursor.Position).X 'CurrControl.Left + e.X
CurrControl.Top = mOwnerForm.PointToClient(Cursor.Position).Y 'CurrControl.Top + e.Y
Dim TmpHeigth As Integer
Dim TmpWidth As Integer
Select Case Index
Case 0 'TopLeft GrabButton
Case 1 'TopMiddle GrabButton
Case 2 'TopRight GrabButton
Case 3 'MiddleLeft GrabButton
Case 4 'MiddleRight GrabButton
TmpWidth = GrabRects(4).Left - mControl.Left
If TmpWidth < mMinWidth Then TmpWidth = mMinWidth
mControl.Width = TmpWidth
Case 5 'BottomLeft GrabButton
Case 6 'BottomMiddle GrabButton
TmpHeigth = CurrControl.Top - mControl.Top
If TmpHeigth < mMinHeigth Then TmpHeigth = mMinHeigth
mControl.Height = TmpHeigth
Case 7 'BottomRight GrabButton
TmpHeigth = CurrControl.Top - mControl.Top
TmpWidth = CurrControl.Left - mControl.Left
If TmpHeigth < mMinHeigth Then TmpHeigth = mMinHeigth
If TmpWidth < mMinWidth Then TmpWidth = mMinWidth
mControl.Size = New Size(TmpWidth, TmpHeigth)
End Select
mOwnerForm.Refresh()
Else
Right = mControl.Right
Bottom = mControl.Bottom
End If
End Sub
Private Sub GrabRectMouseDown(ByVal sender As Object, ByVal e As MouseEventArgs)
InResizeMode = True
For i As Integer = 0 To GrabRects.Length - 1
GrabRects(i).Visible = False
Next
mOwnerForm.Refresh()
End Sub
Private Sub GrabRectMouseUp(ByVal sender As Object, ByVal e As MouseEventArgs)
InResizeMode = False
For i As Integer = 0 To GrabRects.Length - 1
GrabRects(i).Visible = True
Next
mOwnerForm.Refresh()
End Sub
Private Function GetCurrIndex(ByVal sender As Object) As Integer
Dim CurrControl As Control = CType(sender, Control)
For i As Integer = 0 To GrabRects.Length
If GrabRects(i) Is CurrControl Then
Return i
End If
Next
End Function
End Class
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