Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class TransparentFormDemo
public Shared Sub Main
Application.Run(New TransparentForm)
End Sub
End class
Public Class TransparentForm
Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
'Add any initialization after the InitializeComponent() call
Me.SetStyle(ControlStyles.ResizeRedraw, True)
End Sub
'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
'
'TransparentForm
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(208, 68)
Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None
Me.Name = "TransparentForm"
Me.Text = "Transparency Test"
End Sub
#End Region
Private Sub TransparentForm_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
Dim g As Graphics = e.Graphics
Dim pen As Pen = New Pen(Color.Red, 4)
Dim rect As Rectangle = Me.ClientRectangle
rect.Inflate(-2, -2)
g.FillEllipse(Brushes.Yellow, rect)
g.DrawEllipse(pen, rect)
pen.Dispose()
End Sub
Sub SetEllipseRegion()
Dim rect As Rectangle = Me.ClientRectangle
Dim path As GraphicsPath = New GraphicsPath()
path.AddEllipse(RectangleF.op_Implicit(rect))
Me.Region = New Region(path)
path.Dispose()
End Sub
Private Sub TransparentForm_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
SetEllipseRegion()
End Sub
Private Sub TransparentForm_SizeChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.SizeChanged
SetEllipseRegion()
End Sub
Dim downpoint As Point = Point.Empty
Private Sub TransparentForm_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseDown
If e.Button <> MouseButtons.Left Then Exit Sub
downpoint = New Point(e.X, e.Y)
End Sub
Private Sub TransparentForm_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseMove
If downpoint = Point.Empty Then Exit Sub
Dim location As Point = New Point(me.Left + e.X - downpoint.X, me.Top + e.Y - downpoint.Y)
Me.Location = location
End Sub
Private Sub TransparentForm_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseUp
If e.Button <> MouseButtons.Left Then Exit Sub
downpoint = Point.Empty
End Sub
End Class
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