ComboBox.DrawItem : ComboBox « System.Windows.Forms « VB.Net by API

1. VB.Net by API
2. System.Windows.Forms
3. ComboBox

ComboBox.DrawItem

  


Imports System.Windows.Forms
Imports System.Drawing
Imports System.Drawing.Drawing2D

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

    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected 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.XButton = New System.Windows.Forms.Button
        Me.ColorList = New System.Windows.Forms.ComboBox
        Me.SuspendLayout()
        '
        'XButton
        '
        Me.XButton.Location = New System.Drawing.Point(112, 24)
        Me.XButton.Name = "XButton"
        Me.XButton.Size = New System.Drawing.Size(75, 23)
        Me.XButton.TabIndex = 0
        Me.XButton.Text = "Button1"
        Me.XButton.UseVisualStyleBackColor = True
        '
        'ColorList
        '
        Me.ColorList.DrawMode = System.Windows.Forms.DrawMode.OwnerDrawFixed
        Me.ColorList.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList
        Me.ColorList.FormattingEnabled = True
        Me.ColorList.Location = New System.Drawing.Point(88, 64)
        Me.ColorList.Name = "ColorList"
        Me.ColorList.Size = New System.Drawing.Size(121, 21)
        Me.ColorList.TabIndex = 1
        '
        'Form1
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(292, 221)
        Me.Controls.Add(Me.ColorList)
        Me.Controls.Add(Me.XButton)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
        Me.MaximizeBox = False
        Me.Name = "Form1"
        Me.Text = "Control Drawing"
        Me.ResumeLayout(False)

    End Sub
    Friend WithEvents XButton As System.Windows.Forms.Button
    Friend WithEvents ColorList As System.Windows.Forms.ComboBox

End Class
Public Class Form1
    Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        ColorList.Items.Add("Red")
        ColorList.Items.Add("Orange")
        ColorList.Items.Add("Yellow")
        ColorList.Items.Add("Green")
        ColorList.Items.Add("Blue")
        ColorList.Items.Add("Indigo")
        ColorList.Items.Add("Violet")
    End Sub

    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
        e.Graphics.DrawEllipse(Pens.Black, 10, 10, Me.ClientRectangle.Width - 20, _
            Me.ClientRectangle.Height - 20)
    End Sub

    Private Sub XButton_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles XButton.Paint
        Dim usePen As Pen

        e.Graphics.Clear(SystemColors.Control)

        usePen = New Pen(SystemColors.ControlText, 3)
        e.Graphics.DrawRectangle(usePen, XButton.ClientRectangle)

        usePen.Dispose()
    End Sub

    Private Sub ColorList_DrawItem(ByVal sender As Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles ColorList.DrawItem
        Dim useBrush As Brush

        If (e.Index = -1) Then Return

        e.DrawBackground()

        useBrush = New SolidBrush(Color.FromName(CStr(ColorList.Items(e.Index))))
        e.Graphics.FillRectangle(useBrush, _
            e.Bounds.Left + 2, e.Bounds.Top + 2, _
            e.Bounds.Width - 4, e.Bounds.Height - 4)
        useBrush.Dispose()

        e.Graphics.DrawRectangle(Pens.Black, _
            e.Bounds.Left + 2, e.Bounds.Top + 2, _
            e.Bounds.Width - 4, e.Bounds.Height - 4)
        e.DrawFocusRectangle()
    End Sub

    Private Sub XButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles XButton.Click
        MsgBox("Button clicked.")
    End Sub
End Class

public class ComboBoxCellRenderer
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class

   
    
  

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