一、更新记录

1、更新日期：2023-05-30 00:00:00

2、更新内容：
 

VB自制新闻播报控件源码

源码描述：
VB自制的一款新闻播报控件，可以滚动显示头条信息
用到了Graphics.Drawstring
关键代码展示：
Private Sub SetupWindow()
  Me.SetStyle(ControlStyles.OptimizedDoubleBuffer, True)
  Gr = Me.CreateGraphics()
  X = Me.Width
  Me.BorderStyle = Windows.Forms.BorderStyle.Fixed3D
  Me.Dock = DockStyle.Bottom
  _strSize = Gr.MeasureString(_news, Me.Font)
  If (Me.Height < _strSize.Height + 4) Then Me.Height = CInt(_strSize.Height) + 4
  Timer.Interval = 25
  Timer.Start()
End Sub

Private Sub UpdateDisplay()
  Dim tHeight As Double = _strSize.Height
  Select Case Me.TextPosition
   Case TextPlacement.Top : Y = 0
    Case TextPlacement.Middle : Y = CSng((Me.Height / 2) - (tHeight / 2))
    Case TextPlacement.Bottom : Y = CSng(Me.Height - tHeight)
  End Select
  Gr.Clear(Me.BackColor)
  TextRenderer.DrawText(Gr, _news, Me.Font, New Point(CInt(X), CInt(Y)), Me.ForeColor)
  If X <= (0 - _strSize.Width) Then
    X = Me.Width
  Else
    X = CSng(X - _speed)
  End If
End Sub