在开发应用程序时，经常需要为用户提供方便的右键菜单功能。然而，标准的ContextMenuStrip控件在功能上可能过于有限，无法满足所有需求。为了解决这个问题，开发了一个名为MBContextMenuStrip的用户控件，它不仅继承了ContextMenuStrip的所有属性，还添加了类似Microsoft Office 2007的视觉效果。
MBContextMenuStrip是一个继承自ContextMenuStrip的控件，它通过添加Microsoft Office 2007风格的视觉效果，为用户提供了更加美观和直观的界面体验。这个控件是用VB.NET语言编写的，通过简单的拖放操作，就可以轻松地将其添加到窗体中，并像使用标准的ContextMenuStrip一样使用它。
MBContextMenuStrip的设计理念来源于Microsoft Office 2007的右键菜单。将其方法组织成如下层次结构：
以下是一些关键的方法，它们负责渲染类似于Microsoft Office的ContextMenuStrip：
这个方法负责渲染MBContextMenuStrip项的背景：
Protected Overrides Sub OnRenderMenuItemBackground_(ByVal e As System.Windows.Forms.ToolStripItemRenderEventArgs)
If e.Item.Selected Then
Dim g As Graphics = e.Graphics
g.SmoothingMode = SmoothingMode.HighQuality
Dim pa As GraphicsPath = New GraphicsPath()
Dim rect As Rectangle = New Rectangle(2, 1, e.Item.Size.Width - 2, e.Item.Size.Height - 1)
DrawArc(rect, pa)
Dim lgbrush As LinearGradientBrush = New LinearGradientBrush(rect, Color.White, Color.White, LinearGradientMode.Vertical)
Dim pos As Single() = New Single(3) {0.0F, 0.4F, 0.45F, 1.0F}
Dim colors As Color() = New Color(3) {GetColor(0, 50, 100), GetColor(0, 0, 30), Color.FromArgb(R0, G0, B0), GetColor(0, 50, 100)}
Dim mix As ColorBlend = New ColorBlend()
mix.Colors = colors
mix.Positions = pos
lgbrush.InterpolationColors = mix
g.FillPath(lgbrush, pa)
g.DrawPath(New Pen(StrokeColor), pa)
lgbrush.Dispose()
Else
MyBase.OnRenderMenuItemBackground(e)
End If
End Sub
这个方法负责渲染MBContextMenuStrip项的图像：
Protected Overrides Sub OnRenderItemImage_(ByVal e As System.Windows.Forms.ToolStripItemImageRenderEventArgs)
e.Graphics.SmoothingMode = SmoothingMode.HighQuality
If Not (e.Image Is Nothing) Then
imageheight = e.Item.Height - offsety * 2
imagewidth = ((Convert.ToDouble(imageheight) / e.Image.Height) * e.Image.Width)
End If
e.Graphics.DrawImage(e.Image, New Rectangle(offsetx, offsety, imagewidth, imageheight))
End Sub
这个方法负责绘制MBContextMenuStrip的弧形：
Public Sub DrawArc(ByVal re As Rectangle, ByVal pa As GraphicsPath)
Dim _radiusX0Y0 As Int32 = _radius, _radiusXFY0 As Int32 = _radius, _radiusX0YF As Int32 = _radius, _radiusXFYF As Int32 = _radius
pa.AddArc(re.X, re.Y, _radiusX0Y0, _radiusX0Y0, 180, 90)
pa.AddArc(re.Width - _radiusXFY0, re.Y, _radiusXFY0, _radiusXFY0, 270, 90)
pa.AddArc(re.Width - _radiusXFYF, re.Height - _radiusXFYF, _radiusXFYF, _radiusXFYF, 0, 90)
pa.AddArc(re.X, re.Height - _radiusX0YF, _radiusX0YF, _radiusX0YF, 90, 90)
pa.CloseFigure()
End Sub
在应用程序中使用MBContextMenuStrip非常简单。只需将提供的DLL添加到应用程序中，然后通过拖放操作即可。