VB.Net Tutorial/GUI/ComboBox — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
|
(нет различий)
|
Версия 19:40, 26 мая 2010
Содержание
- 1 Add value to ComboBox
- 2 ComboBox Cell renderer
- 3 ComboBox Selected Index Changed event
- 4 ComboBox selection event and Add items
- 5 Get Text from ComboBox
- 6 HatchBrush Illustration by using ComboBox
- 7 Set text for ComboBox
- 8 Use ComboBox to control TextBox font color
- 9 Using ComboBox to select shape to draw
Add value to ComboBox
<source lang="vbnet">Imports System.Windows.Forms public class ComboBoxAddSelection
public Shared Sub Main Application.Run(New Form1) End Sub
End class Public Class Form1
Inherits System.Windows.Forms.Form Public Sub New() MyBase.New() InitializeComponent() End Sub 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 Private components As System.ruponentModel.IContainer Friend WithEvents ComboBox1 As System.Windows.Forms.ruboBox Friend WithEvents TextBox1 As System.Windows.Forms.TextBox Friend WithEvents Button1 As System.Windows.Forms.Button Friend WithEvents Label1 As System.Windows.Forms.Label <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.ruboBox1 = New System.Windows.Forms.ruboBox Me.TextBox1 = New System.Windows.Forms.TextBox Me.Button1 = New System.Windows.Forms.Button Me.Label1 = New System.Windows.Forms.Label Me.SuspendLayout() " "ComboBox1 " Me.ruboBox1.Items.AddRange(New Object() {"AAAAA", "BBBBB", "CCCCC"}) Me.ruboBox1.Location = New System.Drawing.Point(48, 16) Me.ruboBox1.Name = "ComboBox1" Me.ruboBox1.Size = New System.Drawing.Size(144, 21) Me.ruboBox1.TabIndex = 0 Me.ruboBox1.Text = "Select" " "TextBox1 " Me.TextBox1.Location = New System.Drawing.Point(24, 64) Me.TextBox1.Name = "TextBox1" Me.TextBox1.Size = New System.Drawing.Size(96, 20) Me.TextBox1.TabIndex = 1 Me.TextBox1.Text = "" " "Button1 " Me.Button1.Location = New System.Drawing.Point(144, 64) Me.Button1.Name = "Button1" Me.Button1.Size = New System.Drawing.Size(96, 24) Me.Button1.TabIndex = 2 Me.Button1.Text = "Add" " "Label1 " Me.Label1.Location = New System.Drawing.Point(40, 120) Me.Label1.Name = "Label1" Me.Label1.Size = New System.Drawing.Size(168, 24) Me.Label1.TabIndex = 3 Me.Label1.Text = "Select" " "Form1 " Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(264, 182) Me.Controls.Add(Me.Label1) Me.Controls.Add(Me.Button1) Me.Controls.Add(Me.TextBox1) Me.Controls.Add(Me.ruboBox1) Me.ResumeLayout(False) End Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click ComboBox1.Items.Add(TextBox1.Text) TextBox1.Text = "" End Sub Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged Select Case ComboBox1.SelectedIndex Case 0 Label1.Text = "A" Case 1 Label1.Text = "B" Case 2 Label1.Text = "C" End Select End Sub
End Class</source>
ComboBox Cell renderer
<source lang="vbnet">Imports System.Windows.Forms Imports System.Drawing Imports System.Drawing.Drawing2D <Global.Microsoft.VisualBasic.rupilerServices.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.ruponentModel.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.ruboBox 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.ruboBoxStyle.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.ruboBox
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</source>
ComboBox Selected Index Changed event
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class ComboBoxSelectionEventAddValue
public Shared Sub Main Application.Run(New 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 "Required by the Windows Form Designer Private components As System.ruponentModel.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. Friend WithEvents ComboBox1 As System.Windows.Forms.ruboBox Friend WithEvents TextBox1 As System.Windows.Forms.TextBox <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.ruboBox1 = New System.Windows.Forms.ruboBox Me.TextBox1 = New System.Windows.Forms.TextBox Me.SuspendLayout() " "ComboBox1 " Me.ruboBox1.Location = New System.Drawing.Point(72, 72) Me.ruboBox1.Name = "ComboBox1" Me.ruboBox1.Size = New System.Drawing.Size(121, 21) Me.ruboBox1.TabIndex = 0 Me.ruboBox1.Text = "ComboBox1" " "TextBox1 " Me.TextBox1.Location = New System.Drawing.Point(16, 168) Me.TextBox1.Name = "TextBox1" Me.TextBox1.Size = New System.Drawing.Size(256, 20) Me.TextBox1.TabIndex = 2 Me.TextBox1.Text = "" " "Form1 " Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(292, 273) Me.Controls.Add(Me.TextBox1) Me.Controls.Add(Me.ruboBox1) Me.Name = "Form1" Me.Text = "Form1" Me.ResumeLayout(False) End Sub
- End Region
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load For i As Integer = 0 To 10 ComboBox1.Items.Add("Item " + i.ToString()) Next ComboBox1.Text = "Choose one..." End Sub Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged Dim intSelectedIndex As Integer intSelectedIndex = ComboBox1.SelectedIndex Dim objSelectedItem As Object objSelectedItem = ComboBox1.SelectedItem TextBox1.Text = "Item"s index: " & intSelectedIndex & _ ". Item"s text: " & objSelectedItem.ToString() End Sub
End Class</source>
ComboBox selection event and Add items
<source lang="vbnet">Imports System.Windows.Forms public class ComboBoxAddSelection
public Shared Sub Main Application.Run(New Form1) End Sub
End class Public Class Form1
Inherits System.Windows.Forms.Form Public Sub New() MyBase.New() InitializeComponent() End Sub 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 Private components As System.ruponentModel.IContainer Friend WithEvents ComboBox1 As System.Windows.Forms.ruboBox Friend WithEvents TextBox1 As System.Windows.Forms.TextBox Friend WithEvents Button1 As System.Windows.Forms.Button Friend WithEvents Label1 As System.Windows.Forms.Label <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.ruboBox1 = New System.Windows.Forms.ruboBox Me.TextBox1 = New System.Windows.Forms.TextBox Me.Button1 = New System.Windows.Forms.Button Me.Label1 = New System.Windows.Forms.Label Me.SuspendLayout() " "ComboBox1 " Me.ruboBox1.Items.AddRange(New Object() {"AAAAA", "BBBBB", "CCCCC"}) Me.ruboBox1.Location = New System.Drawing.Point(48, 16) Me.ruboBox1.Name = "ComboBox1" Me.ruboBox1.Size = New System.Drawing.Size(144, 21) Me.ruboBox1.TabIndex = 0 Me.ruboBox1.Text = "Select" " "TextBox1 " Me.TextBox1.Location = New System.Drawing.Point(24, 64) Me.TextBox1.Name = "TextBox1" Me.TextBox1.Size = New System.Drawing.Size(96, 20) Me.TextBox1.TabIndex = 1 Me.TextBox1.Text = "" " "Button1 " Me.Button1.Location = New System.Drawing.Point(144, 64) Me.Button1.Name = "Button1" Me.Button1.Size = New System.Drawing.Size(96, 24) Me.Button1.TabIndex = 2 Me.Button1.Text = "Add" " "Label1 " Me.Label1.Location = New System.Drawing.Point(40, 120) Me.Label1.Name = "Label1" Me.Label1.Size = New System.Drawing.Size(168, 24) Me.Label1.TabIndex = 3 Me.Label1.Text = "Select" " "Form1 " Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(264, 182) Me.Controls.Add(Me.Label1) Me.Controls.Add(Me.Button1) Me.Controls.Add(Me.TextBox1) Me.Controls.Add(Me.ruboBox1) Me.ResumeLayout(False) End Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click ComboBox1.Items.Add(TextBox1.Text) TextBox1.Text = "" End Sub Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged Select Case ComboBox1.SelectedIndex Case 0 Label1.Text = "A" Case 1 Label1.Text = "B" Case 2 Label1.Text = "C" End Select End Sub
End Class</source>
Get Text from ComboBox
<source lang="vbnet">Imports System.Windows.Forms public class GetComboBoxText
public Shared Sub Main Application.Run(New Form1) End Sub
End class Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles Button1.Click Dim Language As String Language = ComboBox1.Text If Language = "Visual Basic" Then MsgBox("We have a winner!") Else MsgBox(Language & " is not a bad language.") End If End Sub
End Class Partial Public Class Form1
Inherits System.Windows.Forms.Form <System.Diagnostics.DebuggerNonUserCode()> _ Public Sub New() MyBase.New() "This call is required by the Windows Form Designer. InitializeComponent() End Sub "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.ruponentModel.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.Label1 = New System.Windows.Forms.Label Me.Button1 = New System.Windows.Forms.Button Me.ruboBox1 = New System.Windows.Forms.ruboBox Me.SuspendLayout() " "Label1 " Me.Label1.AutoSize = True Me.Label1.Location = New System.Drawing.Point(13, 22) Me.Label1.Name = "Label1" Me.Label1.Size = New System.Drawing.Size(160, 14) Me.Label1.TabIndex = 0 Me.Label1.Text = "What"s your favorite language?" " "Button1 " Me.Button1.Location = New System.Drawing.Point(13, 70) Me.Button1.Name = "Button1" Me.Button1.Size = New System.Drawing.Size(267, 23) Me.Button1.TabIndex = 2 Me.Button1.Text = "Evaluate my choice" " "ComboBox1 " Me.ruboBox1.FormattingEnabled = True Me.ruboBox1.Items.AddRange(New Object() {"C++", "C#", "Java", "Visual Basic", "Cobol"}) Me.ruboBox1.Location = New System.Drawing.Point(13, 43) Me.ruboBox1.Name = "ComboBox1" Me.ruboBox1.Size = New System.Drawing.Size(267, 21) Me.ruboBox1.TabIndex = 1 " "Form1 " Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(292, 117) Me.Controls.Add(Me.ruboBox1) Me.Controls.Add(Me.Button1) Me.Controls.Add(Me.Label1) Me.Name = "Form1" Me.Text = "Form1" Me.ResumeLayout(False) Me.PerformLayout() End Sub Friend WithEvents Label1 As System.Windows.Forms.Label Friend WithEvents Button1 As System.Windows.Forms.Button Friend WithEvents ComboBox1 As System.Windows.Forms.ruboBox
End Class</source>
HatchBrush Illustration by using ComboBox
<source lang="vbnet">Imports System Imports System.Drawing Imports System.Collections Imports System.ruponentModel Imports System.Windows.Forms Imports System.Data Imports System.Drawing.Drawing2D public class HatchBrushStyleComboBox
public Shared Sub Main Application.Run(New Form1) End Sub
End class
Public Class Form1
Inherits System.Windows.Forms.Form Private style As New HatchStyle Private forClr As Color = Color.Blue Private backClr As Color = Color.Red
- 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 "Required by the Windows Form Designer Private components As System.ruponentModel.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. Friend WithEvents Label1 As System.Windows.Forms.Label Friend WithEvents ComboBox1 As System.Windows.Forms.ruboBox Friend WithEvents Label2 As System.Windows.Forms.Label Friend WithEvents TextBox1 As System.Windows.Forms.TextBox Friend WithEvents Label3 As System.Windows.Forms.Label Friend WithEvents TextBox2 As System.Windows.Forms.TextBox Friend WithEvents ForColorBtn As System.Windows.Forms.Button Friend WithEvents BackGroundBtn As System.Windows.Forms.Button Friend WithEvents ApplyBtn As System.Windows.Forms.Button <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.Label1 = New System.Windows.Forms.Label Me.ruboBox1 = New System.Windows.Forms.ruboBox Me.Label2 = New System.Windows.Forms.Label Me.TextBox1 = New System.Windows.Forms.TextBox Me.Label3 = New System.Windows.Forms.Label Me.TextBox2 = New System.Windows.Forms.TextBox Me.ForColorBtn = New System.Windows.Forms.Button Me.BackGroundBtn = New System.Windows.Forms.Button Me.ApplyBtn = New System.Windows.Forms.Button Me.SuspendLayout() " "Label1 " Me.Label1.Location = New System.Drawing.Point(8, 8) Me.Label1.Name = "Label1" Me.Label1.Size = New System.Drawing.Size(72, 23) Me.Label1.TabIndex = 0 Me.Label1.Text = "Select Style:" " "ComboBox1 " Me.ruboBox1.Location = New System.Drawing.Point(96, 8) Me.ruboBox1.Name = "ComboBox1" Me.ruboBox1.Size = New System.Drawing.Size(121, 21) Me.ruboBox1.TabIndex = 1 Me.ruboBox1.Text = "ComboBox1" " "Label2 " Me.Label2.Location = New System.Drawing.Point(8, 40) Me.Label2.Name = "Label2" Me.Label2.Size = New System.Drawing.Size(96, 23) Me.Label2.TabIndex = 2 Me.Label2.Text = "Forground Color:" " "TextBox1 " Me.TextBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle Me.TextBox1.Location = New System.Drawing.Point(112, 40) Me.TextBox1.Name = "TextBox1" Me.TextBox1.ReadOnly = True Me.TextBox1.Size = New System.Drawing.Size(32, 20) Me.TextBox1.TabIndex = 3 Me.TextBox1.Text = "" " "Label3 " Me.Label3.Location = New System.Drawing.Point(0, 72) Me.Label3.Name = "Label3" Me.Label3.Size = New System.Drawing.Size(104, 23) Me.Label3.TabIndex = 4 Me.Label3.Text = "Background Color:" " "TextBox2 " Me.TextBox2.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle Me.TextBox2.Location = New System.Drawing.Point(112, 72) Me.TextBox2.Name = "TextBox2" Me.TextBox2.ReadOnly = True Me.TextBox2.Size = New System.Drawing.Size(32, 20) Me.TextBox2.TabIndex = 5 Me.TextBox2.Text = "" " "ForColorBtn " Me.ForColorBtn.Location = New System.Drawing.Point(152, 40) Me.ForColorBtn.Name = "ForColorBtn" Me.ForColorBtn.Size = New System.Drawing.Size(48, 23) Me.ForColorBtn.TabIndex = 6 Me.ForColorBtn.Text = "Pick..." " "BackGroundBtn " Me.BackGroundBtn.Location = New System.Drawing.Point(152, 72) Me.BackGroundBtn.Name = "BackGroundBtn" Me.BackGroundBtn.Size = New System.Drawing.Size(48, 23) Me.BackGroundBtn.TabIndex = 7 Me.BackGroundBtn.Text = "Pic..." " "ApplyBtn " Me.ApplyBtn.Location = New System.Drawing.Point(224, 72) Me.ApplyBtn.Name = "ApplyBtn" Me.ApplyBtn.TabIndex = 8 Me.ApplyBtn.Text = "Apply" " "Form1 " Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(416, 325) Me.Controls.Add(Me.ApplyBtn) Me.Controls.Add(Me.BackGroundBtn) Me.Controls.Add(Me.ForColorBtn) Me.Controls.Add(Me.TextBox2) Me.Controls.Add(Me.Label3) Me.Controls.Add(Me.TextBox1) Me.Controls.Add(Me.Label2) Me.Controls.Add(Me.ruboBox1) Me.Controls.Add(Me.Label1) Me.Name = "Form1" Me.Text = "Hatch Brushes" Me.ResumeLayout(False) End Sub
- End Region
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load FillHatchStyles() End Sub Private Sub FillHatchStyles() comboBox1.Items.Add(HatchStyle.BackwardDiagonal.ToString()) comboBox1.Items.Add(HatchStyle.Cross.ToString()) comboBox1.Items.Add(HatchStyle.DashedVertical.ToString()) comboBox1.Items.Add(HatchStyle.DiagonalCross.ToString()) comboBox1.Items.Add(HatchStyle.HorizontalBrick.ToString()) comboBox1.Items.Add(HatchStyle.LightDownwardDiagonal.ToString()) comboBox1.Items.Add(HatchStyle.LightUpwardDiagonal.ToString()) comboBox1.Text = HatchStyle.BackwardDiagonal.ToString() End Sub "FillHatchStyles
Private Sub ApplyBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ApplyBtn.Click Dim g As Graphics = Me.CreateGraphics() g.Clear(Me.BackColor) Dim str As String = ComboBox1.Text Select Case str Case "BackwardDiagonal" style = HatchStyle.BackwardDiagonal Case "DashedVertical" style = HatchStyle.DashedVertical Case "Cross" style = HatchStyle.Cross Case "DiagonalCross" style = HatchStyle.DiagonalCross Case "HorizontalBrick" style = HatchStyle.HorizontalBrick Case "LightDownwardDiagonal" style = HatchStyle.LightDownwardDiagonal Case "LightUpwardDiagonal" style = HatchStyle.LightUpwardDiagonal Case Else End Select Dim brush As New HatchBrush(style, forClr, backClr) g.FillRectangle(brush, 50, 100, 200, 200) brush.Dispose() g.Dispose() End Sub
End Class</source>
Set text for ComboBox
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class ComboBoxSelectionEventAddValue
public Shared Sub Main Application.Run(New 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 "Required by the Windows Form Designer Private components As System.ruponentModel.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. Friend WithEvents ComboBox1 As System.Windows.Forms.ruboBox Friend WithEvents TextBox1 As System.Windows.Forms.TextBox <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.ruboBox1 = New System.Windows.Forms.ruboBox Me.TextBox1 = New System.Windows.Forms.TextBox Me.SuspendLayout() " "ComboBox1 " Me.ruboBox1.Location = New System.Drawing.Point(72, 72) Me.ruboBox1.Name = "ComboBox1" Me.ruboBox1.Size = New System.Drawing.Size(121, 21) Me.ruboBox1.TabIndex = 0 Me.ruboBox1.Text = "ComboBox1" " "TextBox1 " Me.TextBox1.Location = New System.Drawing.Point(16, 168) Me.TextBox1.Name = "TextBox1" Me.TextBox1.Size = New System.Drawing.Size(256, 20) Me.TextBox1.TabIndex = 2 Me.TextBox1.Text = "" " "Form1 " Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(292, 273) Me.Controls.Add(Me.TextBox1) Me.Controls.Add(Me.ruboBox1) Me.Name = "Form1" Me.Text = "Form1" Me.ResumeLayout(False) End Sub
- End Region
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load For i As Integer = 0 To 10 ComboBox1.Items.Add("Item " + i.ToString()) Next ComboBox1.Text = "Choose one..." End Sub Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged Dim intSelectedIndex As Integer intSelectedIndex = ComboBox1.SelectedIndex Dim objSelectedItem As Object objSelectedItem = ComboBox1.SelectedItem TextBox1.Text = "Item"s index: " & intSelectedIndex & _ ". Item"s text: " & objSelectedItem.ToString() End Sub
End Class</source>
Use ComboBox to control TextBox font color
<source lang="vbnet">Imports System.Windows.Forms public class ComboBoxSelectionEvent
public Shared Sub Main Application.Run(New Form1) End Sub
End class Public Class Form1
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged Select Case ComboBox1.SelectedIndex Case 0 TextBox1.ForeColor = System.Drawing.Color.Yellow Case 1 TextBox1.ForeColor = System.Drawing.Color.Red Case 2 TextBox1.ForeColor = System.Drawing.Color.Blue Case 3 TextBox1.ForeColor = System.Drawing.Color.Black End Select End Sub
End Class
<Global.Microsoft.VisualBasic.rupilerServices.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.ruponentModel.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.ruboBox1 = New System.Windows.Forms.ruboBox Me.Label1 = New System.Windows.Forms.Label Me.TextBox1 = New System.Windows.Forms.TextBox Me.SuspendLayout() " "ComboBox1 " Me.ruboBox1.DropDownStyle = System.Windows.Forms.ruboBoxStyle.DropDownList Me.ruboBox1.FormattingEnabled = True Me.ruboBox1.Items.AddRange(New Object() {"Yellow", "Red", "Blue", "Black"}) Me.ruboBox1.Location = New System.Drawing.Point(19, 30) Me.ruboBox1.Margin = New System.Windows.Forms.Padding(4, 4, 4, 4) Me.ruboBox1.Name = "ComboBox1" Me.ruboBox1.Size = New System.Drawing.Size(476, 23) Me.ruboBox1.TabIndex = 0 " "Label1 " Me.Label1.AutoSize = True Me.Label1.Location = New System.Drawing.Point(16, 11) Me.Label1.Margin = New System.Windows.Forms.Padding(4, 0, 4, 0) Me.Label1.Name = "Label1" Me.Label1.Size = New System.Drawing.Size(67, 15) Me.Label1.TabIndex = 1 Me.Label1.Text = "Color" " "TextBox1 " Me.TextBox1.Location = New System.Drawing.Point(16, 62) Me.TextBox1.Margin = New System.Windows.Forms.Padding(4, 4, 4, 4) Me.TextBox1.Multiline = True Me.TextBox1.Name = "TextBox1" Me.TextBox1.Size = New System.Drawing.Size(479, 169) Me.TextBox1.TabIndex = 2 Me.TextBox1.Text = "www.vbex.ru" " "Form1 " Me.AutoScaleDimensions = New System.Drawing.SizeF(8.0!, 15.0!) Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font Me.ClientSize = New System.Drawing.Size(513, 242) Me.Controls.Add(Me.TextBox1) Me.Controls.Add(Me.Label1) Me.Controls.Add(Me.ruboBox1) Me.Margin = New System.Windows.Forms.Padding(4, 4, 4, 4) Me.Name = "Form1" Me.Text = "Form1" Me.ResumeLayout(False) Me.PerformLayout() End Sub Friend WithEvents ComboBox1 As System.Windows.Forms.ruboBox Friend WithEvents Label1 As System.Windows.Forms.Label Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
End Class</source>
Using ComboBox to select shape to draw
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class DrawShapes
public Shared Sub Main Application.Run(New FrmComboBox) End Sub
End class Public Class FrmComboBox
Inherits 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 " contains shape list (circle, square, ellipse, pie) Friend WithEvents cboImage As System.Windows.Forms.ruboBox "Required by the Windows Form Designer Private components As System.ruponentModel.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. <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.cboImage = New System.Windows.Forms.ruboBox() Me.SuspendLayout() " "cboImage " Me.cboImage.DropDownWidth = 121 Me.cboImage.Items.AddRange(New Object() {"Circle", "Square", "Ellipse", "Pie", "Filled Circle", "Filled Square", "Filled Ellipse", "Filled Pie"}) Me.cboImage.Location = New System.Drawing.Point(24, 16) Me.cboImage.Name = "cboImage" Me.cboImage.Size = New System.Drawing.Size(121, 21) Me.cboImage.TabIndex = 0 " "FrmComboBox " Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(292, 273) Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.cboImage}) Me.Name = "FrmComboBox" Me.Text = "ComboBoxTest" Me.ResumeLayout(False) End Sub
- End Region
Private Sub cboImage_SelectedIndexChanged _ (ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles cboImage.SelectedIndexChanged Dim myGraphics As Graphics = MyBase.CreateGraphics() Dim myPen As New Pen(Color.DarkRed) Dim mySolidBrush As New SolidBrush(Color.DarkRed) myGraphics.Clear(Color.White) Select Case cboImage.SelectedIndex Case 0 " case circle is selected myGraphics.DrawEllipse(myPen, 50, 50, 150, 150) Case 1 myGraphics.DrawRectangle(myPen, 50, 50, 150, 150) Case 2 myGraphics.DrawEllipse(myPen, 50, 85, 150, 115) Case 3 myGraphics.DrawPie(myPen, 50, 50, 150, 150, 0, 45) Case 4 myGraphics.FillEllipse(mySolidBrush, 50, 50, 150, 150) Case 5 myGraphics.FillRectangle(mySolidBrush, 50, 50, 150, 150) Case 6 myGraphics.FillEllipse(mySolidBrush, 50, 85, 150, 115) Case 7 myGraphics.FillPie(mySolidBrush, 50, 50, 150, 150, 0, 45) End Select End Sub
End Class</source>