VB.NET MeasureItemEventArgs.ItemHeight属性代码示例

Public Class Form1
   Inherits System.Windows.Forms.Form
   Private WithEvents listBox1 As System.Windows.Forms.ListBox
   Private components As System.ComponentModel.Container = Nothing

   Private FontSize As Single = 12.0F

   '
   '  This sample displays a ListBox that contains a list of all the fonts
   '  installed on the system and draws each item in its respective font.
   '
   Public Sub New()
      InitializeComponent()

      ' Populate control with the fonts installed on the system.
      Dim families As FontFamily() = FontFamily.Families

      Dim family As FontFamily
      For Each family In families
         Dim style As FontStyle = FontStyle.Regular

         ' Monotype Corsiva is only available in italic
         If family.Name = "Monotype Corsiva" Then
            style = style Or FontStyle.Italic
         End If

         listBox1.Items.Add(New ListBoxFontItem(New Font(family.Name, FontSize, style, GraphicsUnit.Point)))
      Next family
   End Sub


   Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
      If disposing Then
         If (components IsNot Nothing) Then
            components.Dispose()
         End If

         If (foreColorBrush IsNot Nothing) Then
            foreColorBrush.Dispose()
         End If
      End If

      MyBase.Dispose(disposing)
   End Sub

   Private Sub InitializeComponent()
      Me.listBox1 = New System.Windows.Forms.ListBox()
      Me.SuspendLayout()
      ' 
      ' listBox1
      ' 
      Me.listBox1.DrawMode = System.Windows.Forms.DrawMode.OwnerDrawVariable
      Me.listBox1.Location = New System.Drawing.Point(16, 48)
      Me.listBox1.Name = "listBox1"
      Me.listBox1.SelectionMode = System.Windows.Forms.SelectionMode.MultiExtended
      Me.listBox1.Size = New System.Drawing.Size(256, 134)
      Me.listBox1.TabIndex = 0
      ' 
      ' Form1
      ' 
      Me.ClientSize = New System.Drawing.Size(292, 273)
      Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.listBox1})
      Me.Name = "Form1"
      Me.Text = "Form1"
      Me.ResumeLayout(False)
   End Sub

   <STAThread()> Shared Sub Main()
      Application.Run(New Form1())
   End Sub

   Private Sub listBox1_MeasureItem(ByVal sender As Object, ByVal e As System.Windows.Forms.MeasureItemEventArgs) Handles listBox1.MeasureItem
      Dim font As Font = CType(listBox1.Items(e.Index), ListBoxFontItem).Font
      Dim stringSize As SizeF = e.Graphics.MeasureString(font.Name, font)

      ' Set the height and width of the item
      e.ItemHeight = CInt(stringSize.Height)
      e.ItemWidth = CInt(stringSize.Width)
   End Sub

   ' For efficiency, cache the brush used for drawing.
   Private foreColorBrush As SolidBrush

   Private Sub listBox1_DrawItem(ByVal sender As Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles listBox1.DrawItem
      Dim brush As Brush

      ' Create the brush using the ForeColor specified by the DrawItemEventArgs
      If foreColorBrush Is Nothing Then
         foreColorBrush = New SolidBrush(e.ForeColor)
      Else
         If Not foreColorBrush.Color.Equals(e.ForeColor) Then
            ' The control's ForeColor has changed, so dispose of the cached brush and
            ' create a new one.
            foreColorBrush.Dispose()
            foreColorBrush = New SolidBrush(e.ForeColor)
         End If
      End If

      ' Select the appropriate brush depending on if the item is selected.
      ' Since State can be a combinateion (bit-flag) of enum values, you can't use
      ' "==" to compare them.
      If (e.State And DrawItemState.Selected) = DrawItemState.Selected Then
         brush = SystemBrushes.HighlightText
      Else
         brush = foreColorBrush
      End If

      ' Perform the painting.
      Dim font As Font = CType(listBox1.Items(e.Index), ListBoxFontItem).Font
      e.DrawBackground()
      e.Graphics.DrawString(font.Name, font, brush, e.Bounds.X, e.Bounds.Y)
      e.DrawFocusRectangle()
   End Sub

   '
   '  A wrapper class for use with storing Fonts in a ListBox.  Since ListBox uses the
   '  ToString() of its items for the text it displays, this class is needed to return
   '  the name of the font, rather than its ToString() value.
   '
   Public Class ListBoxFontItem
      Public Font As Font

      Public Sub New(ByVal f As Font)
         Font = f
      End Sub

      Public Overrides Function ToString() As String
         Return Font.Name
      End Function
   End Class
End Class

' 导入命名空间
Imports System
Imports System.Drawing
Imports System.Reflection
Imports System.Windows.Forms
Imports System.IO


public class MainClass

   Shared Sub Main()
      Dim form1 As Form = New Form1
      Application.Run(form1)
   End Sub

End Class



Public Class Form1
    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

    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
    Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents MenuItem1 As System.Windows.Forms.MenuItem

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.Container

    '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.
    Friend WithEvents Red As System.Windows.Forms.MenuItem
    Friend WithEvents Green As System.Windows.Forms.MenuItem
    Friend WithEvents Blue As System.Windows.Forms.MenuItem
    Friend WithEvents Yellow As System.Windows.Forms.MenuItem
    Friend WithEvents Black As System.Windows.Forms.MenuItem
    Friend WithEvents White As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem2 As System.Windows.Forms.MenuItem
    Friend WithEvents AlignLeft As System.Windows.Forms.MenuItem
    Friend WithEvents AlignCenter As System.Windows.Forms.MenuItem
    Friend WithEvents AlignRight As System.Windows.Forms.MenuItem
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.MainMenu1 = New System.Windows.Forms.MainMenu()
        Me.MenuItem1 = New System.Windows.Forms.MenuItem()
        Me.Red = New System.Windows.Forms.MenuItem()
        Me.Green = New System.Windows.Forms.MenuItem()
        Me.Blue = New System.Windows.Forms.MenuItem()
        Me.Yellow = New System.Windows.Forms.MenuItem()
        Me.Black = New System.Windows.Forms.MenuItem()
        Me.White = New System.Windows.Forms.MenuItem()
        Me.MenuItem2 = New System.Windows.Forms.MenuItem()
        Me.AlignLeft = New System.Windows.Forms.MenuItem()
        Me.AlignCenter = New System.Windows.Forms.MenuItem()
        Me.AlignRight = New System.Windows.Forms.MenuItem()
        '
        'MainMenu1
        '
        Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem1, Me.MenuItem2})
        '
        'MenuItem1
        '
        Me.MenuItem1.Index = 0
        Me.MenuItem1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.Red, Me.Green, Me.Blue, Me.Yellow, Me.Black, Me.White})
        Me.MenuItem1.Text = "Color"
        '
        'Red
        '
        Me.Red.Index = 0
        Me.Red.OwnerDraw = True
        Me.Red.Text = ""
        '
        'Green
        '
        Me.Green.Index = 1
        Me.Green.OwnerDraw = True
        Me.Green.Text = ""
        '
        'Blue
        '
        Me.Blue.Index = 2
        Me.Blue.OwnerDraw = True
        Me.Blue.Text = ""
        '
        'Yellow
        '
        Me.Yellow.Index = 3
        Me.Yellow.OwnerDraw = True
        Me.Yellow.Text = ""
        '
        'Black
        '
        Me.Black.Index = 4
        Me.Black.OwnerDraw = True
        Me.Black.Text = ""
        '
        'White
        '
        Me.White.Index = 5
        Me.White.OwnerDraw = True
        Me.White.Text = ""
        '
        'MenuItem2
        '
        Me.MenuItem2.Index = 1
        Me.MenuItem2.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.AlignLeft, Me.AlignCenter, Me.AlignRight})
        Me.MenuItem2.Text = "Alignment"
        '
        'AlignLeft
        '
        Me.AlignLeft.Index = 0
        Me.AlignLeft.OwnerDraw = True
        Me.AlignLeft.Text = "Left"
        '
        'AlignCenter
        '
        Me.AlignCenter.Index = 1
        Me.AlignCenter.OwnerDraw = True
        Me.AlignCenter.Text = "Center"
        '
        'AlignRight
        '
        Me.AlignRight.Index = 2
        Me.AlignRight.OwnerDraw = True
        Me.AlignRight.Text = "Right"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 129)
        Me.Menu = Me.MainMenu1
        Me.Name = "Form1"
        Me.Text = "Owner-Drawn Menu"

    End Sub

#End Region

    Dim currentFont As Font

    Private Sub Red_DrawItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles Red.DrawItem
        Dim R As New RectangleF(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height)
        e.Graphics.FillRectangle(Brushes.Red, R)
    End Sub

    Private Sub Red_MeasureItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MeasureItemEventArgs) Handles Red.MeasureItem
        Dim itemSize As SizeF
        itemSize = New SizeF(80, 18)
        e.ItemHeight = itemSize.Height
        e.ItemWidth = itemSize.Width
    End Sub

    Private Sub Green_MeasureItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MeasureItemEventArgs) Handles Red.MeasureItem
        Dim itemSize As SizeF
        itemSize = New SizeF(80, 18)
        e.ItemHeight = itemSize.Height
        e.ItemWidth = itemSize.Width
    End Sub

    Private Sub Green_DrawItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles Green.DrawItem
        Dim R As New RectangleF(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height)
        e.Graphics.FillRectangle(Brushes.Green, R)
    End Sub

    Private Sub Blue_MeasureItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MeasureItemEventArgs) Handles Blue.MeasureItem
        Dim itemSize As SizeF
        itemSize = New SizeF(80, 18)
        e.ItemHeight = itemSize.Height
        e.ItemWidth = itemSize.Width
    End Sub

    Private Sub Blue_DrawItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles Blue.DrawItem
        Dim R As New RectangleF(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height)
        e.Graphics.FillRectangle(Brushes.Blue, R)
    End Sub

    Private Sub Yellow_MeasureItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MeasureItemEventArgs) Handles Yellow.MeasureItem
        Dim itemSize As SizeF
        itemSize = New SizeF(80, 18)
        e.ItemHeight = itemSize.Height
        e.ItemWidth = itemSize.Width
    End Sub

    Private Sub Yellow_DrawItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles Yellow.DrawItem
        Dim R As New RectangleF(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height)
        e.Graphics.FillRectangle(Brushes.Yellow, R)
    End Sub

    Private Sub White_MeasureItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MeasureItemEventArgs) Handles White.MeasureItem
        Dim itemSize As SizeF
        itemSize = New SizeF(80, 18)
        e.ItemHeight = itemSize.Height
        e.ItemWidth = itemSize.Width
    End Sub

    Private Sub White_DrawItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles White.DrawItem
        Dim R As New RectangleF(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height)
        e.Graphics.FillRectangle(Brushes.White, R)
    End Sub

    Private Sub Black_MeasureItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MeasureItemEventArgs) Handles Black.MeasureItem
        Dim itemSize As SizeF
        itemSize = New SizeF(80, 18)
        e.ItemHeight = itemSize.Height
        e.ItemWidth = itemSize.Width
    End Sub

    Private Sub Black_DrawItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles Black.DrawItem
        Dim R As New RectangleF(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height)
        e.Graphics.FillRectangle(Brushes.Black, R)
    End Sub

    Private Sub AlignLeft_MeasureItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MeasureItemEventArgs) Handles AlignLeft.MeasureItem
        Dim itemSize As SizeF
        itemSize = New SizeF(40, 14)
        e.ItemHeight = itemSize.Height
        e.ItemWidth = itemSize.Width
    End Sub

    Private Sub AlignLeft_DrawItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles AlignLeft.DrawItem
        Dim R As New RectangleF(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height)
        Dim strfmt As New StringFormat()
        strfmt.Alignment = StringAlignment.Near
        e.Graphics.DrawString("Left", Me.Font, Brushes.Black, R, strfmt)
    End Sub

    Private Sub AlignRight_MeasureItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MeasureItemEventArgs) Handles AlignRight.MeasureItem
        Dim itemSize As SizeF
        itemSize = New SizeF(40, 14)
        e.ItemHeight = itemSize.Height
        e.ItemWidth = itemSize.Width
    End Sub

    Private Sub AlignRight_DrawItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles AlignRight.DrawItem
        Dim R As New RectangleF(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height)
        Dim strfmt As New StringFormat()
        strfmt.Alignment = StringAlignment.Far
        e.Graphics.DrawString("Right", Me.Font, Brushes.Black, R, strfmt)
    End Sub

    Private Sub AlignCenter_MeasureItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MeasureItemEventArgs) Handles AlignCenter.MeasureItem
        Dim itemSize As SizeF
        itemSize = New SizeF(40, 14)
        e.ItemHeight = itemSize.Height
        e.ItemWidth = itemSize.Width
    End Sub

    Private Sub AlignCenter_DrawItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles AlignCenter.DrawItem
        Dim R As New RectangleF(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height)
        Dim strfmt As New StringFormat()
        strfmt.Alignment = StringAlignment.Center
        e.Graphics.DrawString("Center", Me.Font, Brushes.Black, R, strfmt)
    End Sub


    Private Sub Alignment_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AlignCenter.Click, AlignLeft.Click, AlignRight.Click,Red.Click,Green.Click,Blue.Click,Yellow.Click,Black.Click,White.Click
        MessageBox.Show(sender.Text)
    End Sub
End Class