VB.NET TabControl.DrawItem事件代码示例

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

Public Class Form1
    Inherits Form
    Private tabArea As Rectangle
    Private tabTextArea As RectangleF

    Public Sub New()
        Dim tabControl1 As New TabControl()
        Dim tabPage1 As New TabPage()

        ' Allows access to the DrawItem event. 
        tabControl1.DrawMode = TabDrawMode.OwnerDrawFixed

        tabControl1.SizeMode = TabSizeMode.Fixed
        tabControl1.Controls.Add(tabPage1)
        tabControl1.ItemSize = New Size(80, 30)
        tabControl1.Location = New Point(25, 25)
        tabControl1.Size = New Size(250, 250)
        tabPage1.TabIndex = 0
        ClientSize = New Size(300, 300)
        Controls.Add(tabControl1)

        tabArea = tabControl1.GetTabRect(0)
        tabTextArea = RectangleF.op_Implicit(tabControl1.GetTabRect(0))

        ' Binds the event handler DrawOnTab to the DrawItem event 
        ' through the DrawItemEventHandler delegate.
        AddHandler tabControl1.DrawItem, AddressOf DrawOnTab
    End Sub

    ' Declares the event handler DrawOnTab which is a method that
    ' draws a string and Rectangle on the tabPage1 tab.
    Private Sub DrawOnTab(ByVal sender As Object, ByVal e As DrawItemEventArgs)
        Dim g As Graphics = e.Graphics
        Dim p As New Pen(Color.Blue)
        Dim font As New Font("Arial", 10.0F)
        Dim brush As New SolidBrush(Color.Red)

        g.DrawRectangle(p, tabArea)
        g.DrawString("tabPage1", font, brush, tabTextArea)
    End Sub

    Shared Sub Main()
        Application.Run(New Form1())
    End Sub
End Class

' 导入命名空间
Imports System
Imports System.Data
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Data.SqlClient

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



Public Class Form1
    Private Sub tabProject_DrawItem(ByVal sender As Object, _
     ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles tabProject.DrawItem
        Dim rect As Rectangle = e.Bounds
        If (e.State And DrawItemState.Selected) = DrawItemState.Selected Then
            rect.X += 4
            rect.Y += 4
            rect.Width -= 8
            rect.Height -= 8
        Else
            rect.X += 2
            rect.Y += 2
            rect.Width -= 4
            rect.Height -= 4
        End If

        Select Case e.Index
            Case 0
                e.Graphics.FillEllipse(Brushes.Green, rect)
            Case 1
                e.Graphics.FillEllipse(Brushes.Yellow, rect)
            Case 2
                e.Graphics.FillEllipse(Brushes.Red, rect)
        End Select

        If (e.State And DrawItemState.Selected) = DrawItemState.Selected Then
            e.Graphics.DrawEllipse( _
                New Pen(Color.Black, 3), _
                rect)
        Else
            e.Graphics.DrawEllipse(Pens.Black, rect)
        End If
    End Sub
End Class




<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form

    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        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()
        Me.tabProject = New System.Windows.Forms.TabControl
        Me.TabPage1 = New System.Windows.Forms.TabPage
        Me.TabPage2 = New System.Windows.Forms.TabPage
        Me.TabPage3 = New System.Windows.Forms.TabPage
        Me.tabProject.SuspendLayout()
        Me.SuspendLayout()
        '
        'tabProject
        '
        Me.tabProject.Controls.Add(Me.TabPage1)
        Me.tabProject.Controls.Add(Me.TabPage2)
        Me.tabProject.Controls.Add(Me.TabPage3)
        Me.tabProject.DrawMode = System.Windows.Forms.TabDrawMode.OwnerDrawFixed
        Me.tabProject.Location = New System.Drawing.Point(8, 8)
        Me.tabProject.Name = "tabProject"
        Me.tabProject.SelectedIndex = 0
        Me.tabProject.Size = New System.Drawing.Size(272, 200)
        Me.tabProject.TabIndex = 1
        '
        'TabPage1
        '
        Me.TabPage1.Location = New System.Drawing.Point(4, 22)
        Me.TabPage1.Name = "TabPage1"
        Me.TabPage1.Padding = New System.Windows.Forms.Padding(3)
        Me.TabPage1.Size = New System.Drawing.Size(264, 174)
        Me.TabPage1.TabIndex = 0
        Me.TabPage1.Text = "TabPage1"
        '
        'TabPage2
        '
        Me.TabPage2.Location = New System.Drawing.Point(4, 22)
        Me.TabPage2.Name = "TabPage2"
        Me.TabPage2.Padding = New System.Windows.Forms.Padding(3)
        Me.TabPage2.Size = New System.Drawing.Size(264, 174)
        Me.TabPage2.TabIndex = 1
        Me.TabPage2.Text = "TabPage2"
        '
        'TabPage3
        '
        Me.TabPage3.Location = New System.Drawing.Point(4, 22)
        Me.TabPage3.Name = "TabPage3"
        Me.TabPage3.Size = New System.Drawing.Size(264, 174)
        Me.TabPage3.TabIndex = 2
        Me.TabPage3.Text = "TabPage3"
        '
        'Form1
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(289, 217)
        Me.Controls.Add(Me.tabProject)
        Me.Name = "Form1"
        Me.Text = "UseTabControlOwnerDrawn"
        Me.tabProject.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub
    Friend WithEvents tabProject As System.Windows.Forms.TabControl
    Friend WithEvents TabPage1 As System.Windows.Forms.TabPage
    Friend WithEvents TabPage2 As System.Windows.Forms.TabPage
    Friend WithEvents TabPage3 As System.Windows.Forms.TabPage

End Class