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TrackBar.LargeChange-Eigenschaft

  • Artikel

Ruft einen Wert ab, der zur Value-Eigenschaft addiert oder von dieser subtrahiert werden soll, wenn das Bildlauffeld um einen größeren Abstand verschoben wird, oder legt diesen fest.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

Syntax

'Declaration
Public Property LargeChange As Integer
'Usage
Dim instance As TrackBar
Dim value As Integer

value = instance.LargeChange

instance.LargeChange = value

public int LargeChange { get; set; }

public:
property int LargeChange {
    int get ();
    void set (int value);
}

/** @property */
public int get_LargeChange ()

/** @property */
public void set_LargeChange (int value)

public function get LargeChange () : int

public function set LargeChange (value : int)

Eigenschaftenwert

Ein numerischer Wert. Der Standardwert ist 5.

Ausnahmen

Ausnahmetyp Bedingung

ArgumentException

Der zugewiesene Wert ist kleiner als 0.

Hinweise

Wenn der Benutzer die Taste BILD-AUF oder BILD-AB drückt oder auf der Trackleiste auf eine Seite des Bildlauffelds klickt, wird die Value-Eigenschaft entsprechend dem in der LargeChange-Eigenschaft festgelegten Wert geändert. Sie können den LargeChange-Wert auch auf einen Prozentsatz des Height-Werts (bei vertikalen Trackleisten) oder des Width-Werts (bei horizontalen Trackleisten) festlegen. Dadurch verhält sich der Abstand, um den die Trackleiste verschoben wird, relativ zu ihrer Größe.

Beispiel

Im folgenden Codebeispiel wird ein Formular mit einem TrackBar-Steuerelement und einem TextBox-Steuerelement angezeigt. Im Beispiel wird das Festlegen der Eigenschaften Maximum, TickFrequency, LargeChange und SmallChange sowie die Behandlung des Scroll-Ereignisses veranschaulicht. Der Inhalt von TextBox wird auf den Value-Eigenschaftenwert aktualisiert, wenn das Scroll-Ereignis eintritt.

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

using System;
using System.Drawing;
using System.Windows.Forms;

public class Form1 : System.Windows.Forms.Form
{
    private System.Windows.Forms.TrackBar trackBar1;
    private System.Windows.Forms.TextBox textBox1;

    [STAThread]
    static void Main() 
    {
        Application.Run(new Form1());
    }

    public Form1()
    {
        this.textBox1 = new System.Windows.Forms.TextBox();
        this.trackBar1 = new System.Windows.Forms.TrackBar();

        // TextBox for TrackBar.Value update.
        this.textBox1.Location = new System.Drawing.Point(240, 16);
        this.textBox1.Size = new System.Drawing.Size(48, 20);

        // Set up how the form should be displayed and add the controls to the form.
        this.ClientSize = new System.Drawing.Size(296, 62);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {this.textBox1,this.trackBar1});
        this.Text = "TrackBar Example";

        // Set up the TrackBar.
        this.trackBar1.Location = new System.Drawing.Point(8, 8);
        this.trackBar1.Size = new System.Drawing.Size(224, 45);
        this.trackBar1.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.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;
    }


    private void trackBar1_Scroll(object sender, System.EventArgs e)
    {
        // Display the trackbar value in the text box.
        textBox1.Text = "" + trackBar1.Value;
    }
}

using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;
public ref class Form1: public System::Windows::Forms::Form
{
private:
   System::Windows::Forms::TrackBar^ trackBar1;
   System::Windows::Forms::TextBox^ textBox1;

public:
   Form1()
   {
      this->textBox1 = gcnew System::Windows::Forms::TextBox;
      this->trackBar1 = gcnew System::Windows::Forms::TrackBar;
      
      // TextBox for TrackBar::Value update.
      this->textBox1->Location = System::Drawing::Point( 240, 16 );
      this->textBox1->Size = System::Drawing::Size( 48, 20 );
      
      // Set up how the form should be displayed and add the controls to the form.
      this->ClientSize = System::Drawing::Size( 296, 62 );
      array<System::Windows::Forms::Control^>^formControls = {this->textBox1,this->trackBar1};
      this->Controls->AddRange( formControls );
      this->Text = "TrackBar Example";
      
      // Set up the TrackBar.
      this->trackBar1->Location = System::Drawing::Point( 8, 8 );
      this->trackBar1->Size = System::Drawing::Size( 224, 45 );
      this->trackBar1->Scroll += gcnew System::EventHandler( this, &Form1::trackBar1_Scroll );
      
      // 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;
   }


private:
   void trackBar1_Scroll( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      
      // Display the trackbar value in the text box.
      textBox1->Text = String::Concat( "", trackBar1->Value );
   }

};


[STAThread]
int main()
{
   Application::Run( gcnew 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

Plattformen

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1, 1.0

.NET Compact Framework

Unterstützt in: 2.0, 1.0

Siehe auch

Referenz

TrackBar-Klasse
TrackBar-Member
System.Windows.Forms-Namespace