VB.Net Tutorial/GUI/ScrollBar
Содержание
Scroll Bar scrolls and get its current value
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class ScrollBarControl
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 HScrollBar1 As System.Windows.Forms.HScrollBar
Friend WithEvents VScrollBar1 As System.Windows.Forms.VScrollBar
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents Label2 As System.Windows.Forms.Label
Friend WithEvents Label3 As System.Windows.Forms.Label
Friend WithEvents Label4 As System.Windows.Forms.Label
Friend WithEvents Label5 As System.Windows.Forms.Label
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.HScrollBar1 = New System.Windows.Forms.HScrollBar
Me.VScrollBar1 = New System.Windows.Forms.VScrollBar
Me.Label1 = New System.Windows.Forms.Label
Me.Label2 = New System.Windows.Forms.Label
Me.Label3 = New System.Windows.Forms.Label
Me.Label4 = New System.Windows.Forms.Label
Me.Label5 = New System.Windows.Forms.Label
Me.SuspendLayout()
"
"HScrollBar1
"
Me.HScrollBar1.Location = New System.Drawing.Point(24, 208)
Me.HScrollBar1.Name = "HScrollBar1"
Me.HScrollBar1.Size = New System.Drawing.Size(176, 16)
Me.HScrollBar1.TabIndex = 2
Me.HScrollBar1.Value = 50
"
"VScrollBar1
"
Me.VScrollBar1.LargeChange = 1
Me.VScrollBar1.Location = New System.Drawing.Point(208, 32)
Me.VScrollBar1.Maximum = 3
Me.VScrollBar1.Name = "VScrollBar1"
Me.VScrollBar1.Size = New System.Drawing.Size(16, 168)
Me.VScrollBar1.TabIndex = 3
"
"Label1
"
Me.Label1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
Me.Label1.Location = New System.Drawing.Point(24, 32)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(176, 168)
Me.Label1.TabIndex = 4
Me.Label1.Text = "Visual Basic"
"
"Label2
"
Me.Label2.Location = New System.Drawing.Point(88, 240)
Me.Label2.Name = "Label2"
Me.Label2.Size = New System.Drawing.Size(56, 16)
Me.Label2.TabIndex = 5
Me.Label2.Text = "Font Size"
"
"Label3
"
Me.Label3.Location = New System.Drawing.Point(232, 48)
Me.Label3.Name = "Label3"
Me.Label3.Size = New System.Drawing.Size(48, 24)
Me.Label3.TabIndex = 6
Me.Label3.Text = "Red"
"
"Label4
"
Me.Label4.Location = New System.Drawing.Point(232, 96)
Me.Label4.Name = "Label4"
Me.Label4.Size = New System.Drawing.Size(48, 24)
Me.Label4.TabIndex = 7
Me.Label4.Text = "Yellow"
"
"Label5
"
Me.Label5.Location = New System.Drawing.Point(232, 152)
Me.Label5.Name = "Label5"
Me.Label5.Size = New System.Drawing.Size(40, 16)
Me.Label5.TabIndex = 8
Me.Label5.Text = "Green"
"
"Form1
"
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 266)
Me.Controls.Add(Me.Label5)
Me.Controls.Add(Me.Label4)
Me.Controls.Add(Me.Label3)
Me.Controls.Add(Me.Label2)
Me.Controls.Add(Me.Label1)
Me.Controls.Add(Me.VScrollBar1)
Me.Controls.Add(Me.HScrollBar1)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
Private Sub HScrollBar1_Scroll(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ScrollEventArgs) Handles HScrollBar1.Scroll
Label1.Font = New Font(Label1.Font.FontFamily, HScrollBar1.Value)
End Sub
Private Sub VScrollBar1_Scroll(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ScrollEventArgs) Handles VScrollBar1.Scroll
Select Case VScrollBar1.Value
Case 1
Label1.ForeColor = Color.Red
Case 2
Label1.ForeColor = Color.Yellow
Case 3
Label1.ForeColor = Color.Green
End Select
End Sub
End Class</source>
Use ScollBar to control font size
<source lang="vbnet">Imports System.Windows.Forms public class ScrollBarControlFontSize
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class
Public Class Form1
Private Sub HScrollBar1_ValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles HScrollBar1.ValueChanged
Dim mysize As Integer
mysize = HScrollBar1.Value
TextBox1.Font = New System.Drawing.Font("", mysize)
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.HScrollBar1 = New System.Windows.Forms.HScrollBar
Me.TextBox1 = New System.Windows.Forms.TextBox
Me.Label1 = New System.Windows.Forms.Label
Me.SuspendLayout()
"
"HScrollBar1
"
Me.HScrollBar1.LargeChange = 5
Me.HScrollBar1.Location = New System.Drawing.Point(23, 145)
Me.HScrollBar1.Maximum = 55
Me.HScrollBar1.Minimum = 5
Me.HScrollBar1.Name = "HScrollBar1"
Me.HScrollBar1.Size = New System.Drawing.Size(330, 21)
Me.HScrollBar1.TabIndex = 1
Me.HScrollBar1.Value = 5
"
"TextBox1
"
Me.TextBox1.Location = New System.Drawing.Point(18, 14)
Me.TextBox1.Multiline = True
Me.TextBox1.Name = "TextBox1"
Me.TextBox1.Size = New System.Drawing.Size(334, 101)
Me.TextBox1.TabIndex = 2
Me.TextBox1.Text = "www.vbex.ru"
"
"Label1
"
Me.Label1.AutoSize = True
Me.Label1.Location = New System.Drawing.Point(25, 125)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(53, 12)
Me.Label1.TabIndex = 3
Me.Label1.Text = "Font Size"
"
"Form1
"
Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 12.0!)
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
Me.ClientSize = New System.Drawing.Size(378, 175)
Me.Controls.Add(Me.Label1)
Me.Controls.Add(Me.TextBox1)
Me.Controls.Add(Me.HScrollBar1)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
Me.PerformLayout()
End Sub
Friend WithEvents HScrollBar1 As System.Windows.Forms.HScrollBar
Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
Friend WithEvents Label1 As System.Windows.Forms.Label
End Class</source>
Use ScrollBars to control the scroll of an Image
<source lang="vbnet">imports System imports System.Drawing imports System.Windows.Forms public class ScrollBars : inherits Form
dim pnl as Panel
dim pb as PictureBox
dim hbar as HScrollBar
dim vbar as VScrollBar
dim img as Image
public sub New()
Size = new Size(480,300)
img = Image.FromFile("yourfile.jpg")
pnl = new Panel()
pnl.Parent = me
pnl.Size = new Size(400,200)
pnl.Location = new Point(10,10)
pnl.BorderStyle = BorderStyle.FixedSingle
pb = new PictureBox()
pb.Parent = pnl
pb.Size = new Size(img.Size.Width, img.Size.Height)
pb.Location = new Point(0, 0)
pb.SizeMode = PictureBoxSizeMode.CenterImage
pb.Image = img
hbar = new HScrollBar()
hbar.Parent = me
hbar.Location = new Point(pnl.Left, pnl.Bottom + 25)
hbar.Size = new Size(pnl.Width, 25)
hbar.Minimum = 0
hbar.Maximum = 100
hbar.SmallChange = 1
hbar.LargeChange = 10
hbar.Value = 10
AddHandler hbar.ValueChanged, AddressOf hbar_OnValueChanged
vbar = new VScrollBar()
vbar.Parent = me
vbar.Location = new Point(pnl.Right + 25, pnl.Top)
vbar.Size = new Size(25, pnl.Height)
vbar.Minimum = 0
vbar.Maximum = 100
vbar.SmallChange = 1
vbar.LargeChange = 10
vbar.Value = CType((vbar.Maximum - vbar.Minimum) / 2, integer)
AddHandler vbar.ValueChanged, AddressOf vbar_OnValueChanged
end sub " close for constructor
private sub hbar_OnValueChanged(ByVal sender as object,ByVal e as EventArgs)
pb.Location = new Point(CType((pnl.Size.Width - img.Size.Width) * _
hbar.Value /(hbar.Maximum - hbar.LargeChange + 1), integer), _
pb.Top)
end sub
private sub vbar_OnValueChanged(ByVal sender as object,ByVal e as EventArgs)
pb.Location = new Point(pb.Left, _
CType((pnl.Size.Height - img.Size.Height) * _
vbar.Value / (vbar.Maximum - vbar.LargeChange + 1), integer))
end sub
public shared sub Main()
Application.Run(new ScrollBars())
end sub
end class</source>
Use ScrollBar to control the image scroll in a PictureBox
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class UseScrollBarToControlTheScrollingOfAnImage
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 PictureBox1 As System.Windows.Forms.PictureBox
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents HScrollBar1 As System.Windows.Forms.HScrollBar
Friend WithEvents VScrollBar1 As System.Windows.Forms.VScrollBar
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.PictureBox1 = New System.Windows.Forms.PictureBox
Me.Label1 = New System.Windows.Forms.Label
Me.HScrollBar1 = New System.Windows.Forms.HScrollBar
Me.VScrollBar1 = New System.Windows.Forms.VScrollBar
Me.Button1 = New System.Windows.Forms.Button
Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog
Me.SuspendLayout()
"
"PictureBox1
"
Me.PictureBox1.Location = New System.Drawing.Point(64, 72)
Me.PictureBox1.Name = "PictureBox1"
Me.PictureBox1.Size = New System.Drawing.Size(168, 144)
Me.PictureBox1.TabIndex = 0
Me.PictureBox1.TabStop = False
"
"Label1
"
Me.Label1.Font = New System.Drawing.Font("Microsoft Sans Serif", 24.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
Me.Label1.Location = New System.Drawing.Point(0, 0)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(264, 48)
Me.Label1.TabIndex = 1
Me.Label1.Text = "Handling Images"
"
"HScrollBar1
"
Me.HScrollBar1.Location = New System.Drawing.Point(64, 200)
Me.HScrollBar1.Name = "HScrollBar1"
Me.HScrollBar1.Size = New System.Drawing.Size(168, 16)
Me.HScrollBar1.TabIndex = 2
Me.HScrollBar1.Visible = False
"
"VScrollBar1
"
Me.VScrollBar1.Location = New System.Drawing.Point(216, 72)
Me.VScrollBar1.Name = "VScrollBar1"
Me.VScrollBar1.Size = New System.Drawing.Size(16, 128)
Me.VScrollBar1.TabIndex = 3
Me.VScrollBar1.Visible = False
"
"Button1
"
Me.Button1.Location = New System.Drawing.Point(112, 248)
Me.Button1.Name = "Button1"
Me.Button1.TabIndex = 4
Me.Button1.Text = "Load Image"
"
"Form1
"
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 273)
Me.Controls.Add(Me.Button1)
Me.Controls.Add(Me.VScrollBar1)
Me.Controls.Add(Me.HScrollBar1)
Me.Controls.Add(Me.Label1)
Me.Controls.Add(Me.PictureBox1)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
- End Region
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
PictureBox1.Image = Image.FromFile("yourfile.jpg")
HScrollBar1.Maximum = PictureBox1.Image.Width - PictureBox1.Width + HScrollBar1.Height
VScrollBar1.Maximum = PictureBox1.Image.Height - PictureBox1.Height + VScrollBar1.Width
VScrollBar1.Visible = True
HScrollBar1.Visible = True
If PictureBox1.Height > PictureBox1.Image.Height Then
VScrollBar1.Visible = False
End If
If PictureBox1.Width > PictureBox1.Image.Width Then
HScrollBar1.Visible = False
End If
End Sub
Private Sub HScrollBar1_Scroll(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ScrollEventArgs) Handles HScrollBar1.Scroll
Dim gphPictureBox As Graphics = PictureBox1.CreateGraphics()
gphPictureBox.DrawImage(PictureBox1.Image, New Rectangle(0, 0, _
PictureBox1.Width - HScrollBar1.Height, _
PictureBox1.Height - VScrollBar1.Width), _
New Rectangle(HScrollBar1.Value, VScrollBar1.Value, _
PictureBox1.Width - HScrollBar1.Height, _
PictureBox1.Height - VScrollBar1.Width), GraphicsUnit.Pixel)
End Sub
Private Sub VScrollBar1_Scroll(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ScrollEventArgs) Handles VScrollBar1.Scroll
Dim gphPictureBox As Graphics = PictureBox1.CreateGraphics()
gphPictureBox.DrawImage(PictureBox1.Image, New Rectangle(0, 0, _
PictureBox1.Width - HScrollBar1.Height, _
PictureBox1.Height - VScrollBar1.Width), _
New Rectangle(HScrollBar1.Value, VScrollBar1.Value, _
PictureBox1.Width - HScrollBar1.Height, _
PictureBox1.Height - VScrollBar1.Width), GraphicsUnit.Pixel)
End Sub
End Class</source>
Value change event: Verical/Horizontal scroll bar
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class PictureMouseDownEvent
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 TextBox1 As System.Windows.Forms.TextBox
Friend WithEvents HScrollBar1 As System.Windows.Forms.HScrollBar
Friend WithEvents VScrollBar1 As System.Windows.Forms.VScrollBar
Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.TextBox1 = New System.Windows.Forms.TextBox
Me.HScrollBar1 = New System.Windows.Forms.HScrollBar
Me.VScrollBar1 = New System.Windows.Forms.VScrollBar
Me.TextBox2 = New System.Windows.Forms.TextBox
Me.SuspendLayout()
"
"TextBox1
"
Me.TextBox1.Location = New System.Drawing.Point(24, 88)
Me.TextBox1.Name = "TextBox1"
Me.TextBox1.Size = New System.Drawing.Size(200, 20)
Me.TextBox1.TabIndex = 1
Me.TextBox1.Text = ""
"
"HScrollBar1
"
Me.HScrollBar1.Location = New System.Drawing.Point(24, 152)
Me.HScrollBar1.Name = "HScrollBar1"
Me.HScrollBar1.Size = New System.Drawing.Size(200, 16)
Me.HScrollBar1.TabIndex = 2
"
"VScrollBar1
"
Me.VScrollBar1.Location = New System.Drawing.Point(240, 88)
Me.VScrollBar1.Name = "VScrollBar1"
Me.VScrollBar1.TabIndex = 3
"
"TextBox2
"
Me.TextBox2.Location = New System.Drawing.Point(24, 120)
Me.TextBox2.Name = "TextBox2"
Me.TextBox2.Size = New System.Drawing.Size(200, 20)
Me.TextBox2.TabIndex = 4
Me.TextBox2.Text = ""
"
"Form1
"
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 273)
Me.Controls.Add(Me.TextBox2)
Me.Controls.Add(Me.VScrollBar1)
Me.Controls.Add(Me.HScrollBar1)
Me.Controls.Add(Me.TextBox1)
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
HScrollBar1.Minimum = 0
HScrollBar1.Maximum = 100
HScrollBar1.LargeChange = 20
HScrollBar1.SmallChange = 5
HScrollBar1.Value = 25
VScrollBar1.Minimum = 0
VScrollBar1.Maximum = 100
VScrollBar1.LargeChange = 20
VScrollBar1.SmallChange = 5
VScrollBar1.Value = 25
TextBox1.Text = "Horizontal scroll value: " & HScrollBar1.Value
TextBox2.Text = "Vertical scroll value: " & VScrollBar1.Value
End Sub
Private Sub VScrollBar1_Scroll(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ScrollEventArgs) Handles VScrollBar1.Scroll
TextBox1.Text = "Horizontal scroll value: " & HScrollBar1.Value
TextBox2.Text = "Vertical scroll value: " & e.NewValue
End Sub
Private Sub HScrollBar1_Scroll(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ScrollEventArgs) Handles HScrollBar1.Scroll
TextBox1.Text = "Horizontal scroll value: " & e.NewValue
TextBox2.Text = "Vertical scroll value: " & VScrollBar1.Value
End Sub
End Class</source>
