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Public Class SizerControl
'Hotspot rectangles
Private mNWRect As Rectangle
Private mNERect As Rectangle
Private mSWRect As Rectangle
Private mSERect As Rectangle
'Hotspot mousedown flags
Private mNWSelected As Boolean = False
Private mNESelected As Boolean = False
Private mSWSelected As Boolean = False
Private mSESelected As Boolean = False
'The way the control is coorodinated
'
'NWx,NWy NEx,NEy
' |--------------------------|
' | |
' | |
' | |
' |--------------------------|
'SWx,SWy SEx,SEy
'Individual offset variables
Private mNWxOffset As Integer
Private mNWyOffset As Integer
Private mNExOffset As Integer
Private mNEyOffset As Integer
Private mSExOffset As Integer
Private mSEyOffset As Integer
Private mSWxOffset As Integer
Private mSWyOffset As Integer
Private mCenteralXOffset As Integer
Private mCentralYOffset As Integer
'point of the control oposite where the user is dragging
Private storedOposite As Point
Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
MyBase.OnPaint(e)
'Draw each of the hotspots when the form paints
mNWRect = New Rectangle(0, 0, 10, 10)
mNERect = New Rectangle(MyBase.Width - 11, 0, 10, 10)
mSWRect = New Rectangle(0, MyBase.Height - 11, 10, 10)
mSERect = New Rectangle(MyBase.Width - 11, MyBase.Height - 11, 10, 10)
e.Graphics.DrawRectangle(Pens.Black, mNWRect)
e.Graphics.DrawRectangle(Pens.Black, mNERect)
e.Graphics.DrawRectangle(Pens.Black, mSWRect)
e.Graphics.DrawRectangle(Pens.Black, mSERect)
End Sub
Private Sub UserControl1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
MyBase.Parent.SuspendLayout()
'When the user presses down on the left mouse button store
'some critical numbers for use durring the mouse move.
If (mNWRect.Contains(e.Location)) Then
mNWSelected = True
mNWxOffset = e.X
mNWyOffset = e.Y
storedOposite.X = (MyBase.Location.X + MyBase.Width)
storedOposite.Y = (MyBase.Location.Y + MyBase.Height)
ElseIf (mNERect.Contains(e.Location)) Then
mNESelected = True
mNExOffset = (MyBase.Width - e.X)
mNEyOffset = e.Y
storedOposite.X = MyBase.Location.X
storedOposite.Y = (MyBase.Location.Y + MyBase.Height)
ElseIf (mSWRect.Contains(e.Location)) Then
mSWSelected = True
mSWxOffset = e.X
mSWyOffset = (MyBase.Height - e.Y)
storedOposite.X = (MyBase.Location.X + MyBase.Width)
storedOposite.Y = MyBase.Location.Y
ElseIf (mSERect.Contains(e.Location)) Then
mSESelected = True
mSExOffset = (MyBase.Width - e.X)
mSEyOffset = (MyBase.Height - e.Y)
Else 'clicked on anyting BUT the handles
mCenteralXOffset = e.X
mCentralYOffset = e.Y
End If
End Sub
Private Sub UserControl1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseUp
mNWSelected = False
mNESelected = False
mSWSelected = False
mSESelected = False
MyBase.Parent.ResumeLayout()
End Sub
Private Sub UserControl1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove
'Set the proper mouse pointer for each hotspot
If (mNWRect.Contains(e.Location)) Then
MyBase.Cursor = Cursors.PanNW
ElseIf (mNERect.Contains(e.Location)) Then
MyBase.Cursor = Cursors.PanNE
ElseIf (mSWRect.Contains(e.Location)) Then
MyBase.Cursor = Cursors.PanSW
ElseIf (mSERect.Contains(e.Location)) Then
MyBase.Cursor = Cursors.PanSE
Else
MyBase.Cursor = Cursors.SizeAll
End If
'React to the movement only when the left button is held down.
If (e.Button = Windows.Forms.MouseButtons.Left) Then
If (mNWSelected = True) Then
Dim clientPosition As Point = MyBase.Parent.PointToClient(System.Windows.Forms.Cursor.Position)
Dim adjustedLocation As New Point(clientPosition.X - mNWxOffset, clientPosition.Y - mNWyOffset)
Dim width As Integer = storedOposite.X - adjustedLocation.X
Dim height As Integer = storedOposite.Y - adjustedLocation.Y
If ((width > 25) And (height > 25)) Then
MyBase.Location = adjustedLocation
MyBase.Width = width
MyBase.Height = height
MyBase.Invalidate()
End If
ElseIf (mNESelected = True) Then
Dim clientPosition As Point = MyBase.Parent.PointToClient(System.Windows.Forms.Cursor.Position)
Dim adjustedLocation As New Point(MyBase.Location.X, (clientPosition.Y - mNEyOffset))
Dim width As Integer = ((clientPosition.X + mNExOffset) - MyBase.Location.X)
Dim height As Integer = (storedOposite.Y - adjustedLocation.Y)
If ((width > 25) And (height > 25)) Then
MyBase.Location = adjustedLocation
MyBase.Width = width
MyBase.Height = height
MyBase.Invalidate()
End If
ElseIf (mSWSelected = True) Then
Dim clientPosition As Point = MyBase.Parent.PointToClient(System.Windows.Forms.Cursor.Position)
Dim adjustedLocation As New Point(clientPosition.X - mSWxOffset, MyBase.Location.Y)
Dim width As Integer = ((storedOposite.X + mSWxOffset) - clientPosition.X)
Dim height As Integer = ((clientPosition.Y + mSWyOffset) - MyBase.Location.Y)
If ((width > 25) And (height > 25)) Then
MyBase.Location = adjustedLocation
MyBase.Width = width
MyBase.Height = height
MyBase.Invalidate()
End If
ElseIf (mSESelected = True) Then
Dim width As Integer = (e.X + mSExOffset)
Dim height As Integer = (e.Y + mSEyOffset)
If ((width > 25) And (height > 25)) Then
MyBase.Width = width
MyBase.Height = height
MyBase.Invalidate()
End If
Else
Dim clientPosition As Point = MyBase.Parent.PointToClient(System.Windows.Forms.Cursor.Position)
Dim adjustedLocation As New Point(clientPosition.X - mCenteralXOffset, clientPosition.Y - mCentralYOffset)
MyBase.Location = adjustedLocation
End If
End If
End Sub
End Class
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Ray spends his time between running a private software company (www.enterprocity.com) and working during the day as a Software Architect for Independent Health (www.independenthealth.com).
His second love, falling only below his wife and child, is programming. His language of choice is VB.NET but he can work in C# and C/C++ enough to get by. Unfortunately his current day job @ IH has him buried deep in solutions using Java (UGH).
He has also recently started a teaching career at a local community college.
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