TrackBar Class
Assembly: System.Windows.Forms (in system.windows.forms.dll)
'Declaration <ComVisibleAttribute(True)> _ <ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)> _ Public Class TrackBar Inherits Control Implements ISupportInitialize 'Usage Dim instance As TrackBar
/** @attribute ComVisibleAttribute(true) */ /** @attribute ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch) */ public class TrackBar extends Control implements ISupportInitialize
ComVisibleAttribute(true) ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch) public class TrackBar extends Control implements ISupportInitialize
The TrackBar is a scrollable control similar to the ScrollBar control. You can configure ranges through which the value of the Value property of a track bar scrolls by setting the Minimum property to specify the lower end of the range and the Maximum property to specify the upper end of the range.
The LargeChange property defines the increment to add or subtract from the Value property when clicks occur on either side of the scroll box. The track bar can be displayed horizontally or vertically.
You can use this control to input numeric data obtained through the Value property. You can display this numeric data in a control or use it in code.
The following code example displays a form containing a TrackBar control and a TextBox control. The example demonstrates setting the Maximum, TickFrequency, LargeChange, and SmallChange properties and handling the Scroll event. The TextBox contents are updated to the Value property value when the Scroll event occurs.
Imports System Imports System.Drawing Imports System.Windows.Forms Public Class Form1 Inherits System.Windows.Forms.Form Private WithEvents trackBar1 As System.Windows.Forms.TrackBar Private textBox1 As System.Windows.Forms.TextBox <System.STAThread()> _ Public Shared Sub Main() System.Windows.Forms.Application.Run(New Form1) End Sub 'Main Public Sub New() Me.textBox1 = New System.Windows.Forms.TextBox Me.trackBar1 = New System.Windows.Forms.TrackBar ' TextBox for TrackBar.Value update. Me.textBox1.Location = New System.Drawing.Point(240, 16) Me.textBox1.Size = New System.Drawing.Size(48, 20) ' Set up how the form should be displayed and add the controls to the form. Me.ClientSize = New System.Drawing.Size(296, 62) Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.textBox1, Me.trackBar1}) Me.Text = "TrackBar Example" ' Set up the TrackBar. Me.trackBar1.Location = New System.Drawing.Point(8, 8) Me.trackBar1.Size = New System.Drawing.Size(224, 45) ' The Maximum property sets the value of the track bar when ' the slider is all the way to the right. trackBar1.Maximum = 30 ' The TickFrequency property establishes how many positions ' are between each tick-mark. trackBar1.TickFrequency = 5 ' The LargeChange property sets how many positions to move ' if the bar is clicked on either side of the slider. trackBar1.LargeChange = 3 ' The SmallChange property sets how many positions to move ' if the keyboard arrows are used to move the slider. trackBar1.SmallChange = 2 End Sub 'New Private Sub trackBar1_Scroll(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles trackBar1.Scroll ' Display the trackbar value in the text box. textBox1.Text = trackBar1.Value End Sub End Class 'Form1
import System.*;
import System.Drawing.*;
import System.Windows.Forms.*;
public class Form1 extends System.Windows.Forms.Form
{
private System.Windows.Forms.TrackBar trackBar1;
private System.Windows.Forms.TextBox textBox1;
/** @attribute STAThread()
*/
public static void main(String[] args)
{
Application.Run(new Form1());
} //main
public Form1()
{
this.textBox1 = new System.Windows.Forms.TextBox();
this.trackBar1 = new System.Windows.Forms.TrackBar();
// TextBox for TrackBar.Value update.
this.textBox1.set_Location(new System.Drawing.Point(240, 16));
this.textBox1.set_Size(new System.Drawing.Size(48, 20));
// Set up how the form should be displayed and add the controls to the
// form.
this.set_ClientSize(new System.Drawing.Size(296, 62));
this.get_Controls().AddRange(new System.Windows.Forms.Control[] {
this.textBox1, this.trackBar1 });
this.set_Text("TrackBar Example");
// Set up the TrackBar.
this.trackBar1.set_Location(new System.Drawing.Point(8, 8));
this.trackBar1.set_Size(new System.Drawing.Size(224, 45));
this.trackBar1.add_Scroll(new System.EventHandler(this.trackBar1_Scroll));
// The Maximum property sets the value of the track bar when
// the slider is all the way to the right.
trackBar1.set_Maximum(30);
// The TickFrequency property establishes how many positions
// are between each tick-mark.
trackBar1.set_TickFrequency(5);
// The LargeChange property sets how many positions to move
// if the bar is clicked on either side of the slider.
trackBar1.set_LargeChange(3);
// The SmallChange property sets how many positions to move
// if the keyboard arrows are used to move the slider.
trackBar1.set_SmallChange(2);
} //Form1
private void trackBar1_Scroll(Object sender, System.EventArgs e)
{
// Display the trackbar value in the text box.
textBox1.set_Text("" + trackBar1.get_Value());
} //trackBar1_Scroll
} //Form1
System.MarshalByRefObject
System.ComponentModel.Component
System.Windows.Forms.Control
System.Windows.Forms.TrackBar
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.