TrackBar.SmallChange プロパティ

.NET Framework クラス ライブラリ リファレンス

TrackBar.SmallChange プロパティ

スクロール ボックスがわずかに移動したときに Value プロパティに対して加算または減算される値を取得または設定します。

名前空間: System.Windows.Forms
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)
構文

Visual Basic (宣言)

Public Property SmallChange As
 Integer

Visual Basic (使用法)

Dim instance As TrackBar
Dim value As Integer

value = instance.SmallChange

instance.SmallChange = value

C#

public int SmallChange { get;
 set; }

C++

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

J#

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

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

JScript

public function get SmallChange
 () : int

public function set SmallChange
 (value : int)

プロパティ値
数値。既定値は、1 です。

例外

例外の種類	条件
ArgumentException	代入される値が 0 未満です。

解説

ユーザーが方向キーの 1 つを押すと、Value プロパティは SmallChange プロパティに設定されている値に従って変更されます。

SmallChange 値には、Height プロパティ (垂直方向のトラック バーの場合) または Width プロパティ (水平方向のトラック バーの場合) の値に対する比率を設定できます。このように設定すると、トラック バーのサイズに対するトラック バーの移動距離の比率が保たれます。

使用例

TrackBar コントロールと TextBox コントロールが配置されたフォームを表示するコード例を次に示します。この例では、Maximum、TickFrequency、LargeChange、SmallChange の各プロパティを設定して、Scroll イベントを処理しています。TextBox の内容は、Scroll イベントが発生したときに、Value プロパティの値に更新されます。

Visual Basic

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

C#

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;
    }
}

C++

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 );
}

J#

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

プラットフォーム

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

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0、1.0

参照

関連項目
TrackBar クラス
TrackBar メンバ
System.Windows.Forms 名前空間