AutoScrollSmallChange Property

Gets or sets the amount that the scroll bar is incremented or decremented for a small scroll.

Syntax

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

[BrowsableAttribute(false)]
public virtual Size AutoScrollSmallChange {get;}

'Declaration
 
<BrowsableAttribute(False)>
Public Overridable ReadOnly Property AutoScrollSmallChange As Size

'Usage
 
Dim instance As RasterImageViewer
Dim value As Size
 
value = instance.AutoScrollSmallChange

[BrowsableAttribute(false)]
public virtual Size AutoScrollSmallChange {get;}

BrowsableAttribute()
 get_AutoScrollSmallChange();

[BrowsableAttribute(false)]
public:
virtual property Size AutoScrollSmallChange {
   Size get();
}

Property Value

The amount that the scroll bar is incremented or decremented.

Remarks

A small scroll (or a line scroll) occurs when the user clicks an arrow.

Example

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Private Class MyForm3 : Inherits Form
      Public viewer As RasterImageViewer
      Private panel As Panel
      Private myHScroll As HScrollBar
      Private myVScroll As VScrollBar
      Public Sub New(ByVal title As String)
         Text = title

         Me.Size = New Size(750, 450)

         panel = New Panel()
         panel.Dock = DockStyle.Fill
         Controls.Add(panel)

         ' Create the raster viewer
         viewer = New RasterImageViewer()
         viewer.Dock = DockStyle.Fill
         viewer.Width = 500
         viewer.DoubleBuffer = True
         panel.Controls.Add(viewer)

         ' Load an image into the viewer
         Dim codecs As RasterCodecs = New RasterCodecs()
         viewer.Image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Sample1.cmp"))
         codecs.Dispose()

         viewer.AutoScroll = False
         Dim size As Size = viewer.AutoScrollMinSize

         ' Create two scrollbar controls for scrolling

         myHScroll = New HScrollBar()
         myHScroll.Location = New Point(100, 50)
         myHScroll.Dock = DockStyle.Top
         myHScroll.Height *= 2
         myHScroll.Minimum = 0
         myHScroll.Maximum = viewer.Image.Width
         AddHandler myHScroll.ValueChanged, AddressOf hScroll_ValueChanged
         panel.Controls.Add(myHScroll)
         myHScroll.BringToFront()

         myVScroll = New VScrollBar()
         myVScroll.Dock = DockStyle.Left
         myVScroll.Location = New Point(100, 100)
         myVScroll.Width *= 2
         myVScroll.Minimum = 0
         myVScroll.Maximum = viewer.Image.Height
         AddHandler myVScroll.ValueChanged, AddressOf vScroll_ValueChanged
         panel.Controls.Add(myVScroll)
         myVScroll.BringToFront()

         viewer.BringToFront()

         OnSizeChanged(EventArgs.Empty)
      End Sub

      Private Sub vScroll_ValueChanged(ByVal sender As Object, ByVal e As EventArgs)
         viewer.ScrollPosition = New Point(myHScroll.Value, myVScroll.Value)
      End Sub

      Private Sub hScroll_ValueChanged(ByVal sender As Object, ByVal e As EventArgs)
         viewer.ScrollPosition = New Point(myHScroll.Value, myVScroll.Value)
      End Sub

      Protected Overrides Sub OnSizeChanged(ByVal e As EventArgs)
         If (Not myHScroll Is Nothing) AndAlso (Not myVScroll Is Nothing) Then
            myHScroll.SmallChange = viewer.AutoScrollSmallChange.Width
            myHScroll.LargeChange = viewer.AutoScrollLargeChange.Width
            myVScroll.SmallChange = viewer.AutoScrollSmallChange.Height
            myVScroll.LargeChange = viewer.AutoScrollLargeChange.Height

            Console.WriteLine("AutoScrollSmallChange  {0}", viewer.AutoScrollSmallChange)
            Console.WriteLine("AutoScrollLargeChange  {0}", viewer.AutoScrollLargeChange)
            Console.WriteLine("AutoScrollMinSize      {0}", viewer.AutoScrollMinSize)
            Console.WriteLine("SmallScrollChangeRatio {0}", viewer.SmallScrollChangeRatio)
            Console.WriteLine("HScroll                {0}", viewer.HScroll)
            Console.WriteLine("VScroll                {0}", viewer.VScroll)
            Console.WriteLine("")

            myHScroll.Enabled = viewer.HScroll
            myVScroll.Enabled = viewer.VScroll
         End If
         MyBase.OnSizeChanged(e)
      End Sub

   End Class

   Public Sub RasterImageViewer_HScroll(ByVal title As String)
      Dim form As MyForm3 = New MyForm3(title)
      form.ShowDialog()
   End Sub

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

class MyForm3 : Form
   {
      public RasterImageViewer viewer;
      Panel panel;
      HScrollBar hScroll;
      VScrollBar vScroll;
      public MyForm3(string title)
      {
         Text = title;

         Size = new Size(750, 450);

         panel = new Panel();
         panel.Dock = DockStyle.Fill;
         Controls.Add(panel);

         // Create the raster viewer
         viewer = new RasterImageViewer();
         viewer.Dock = DockStyle.Fill;
         viewer.Width = 500;
         viewer.DoubleBuffer = true;
         panel.Controls.Add(viewer);

         // Load an image into the viewer
         RasterCodecs codecs = new RasterCodecs();
         viewer.Image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Sample1.cmp"));
         codecs.Dispose();

         viewer.AutoScroll = false;
         Size size = viewer.AutoScrollMinSize;

         // Create two scrollbar controls for scrolling

         hScroll = new HScrollBar();
         hScroll.Location = new Point(100, 50);
         hScroll.Dock = DockStyle.Top;
         hScroll.Height *= 2;
         hScroll.Minimum = 0;
         hScroll.Maximum = viewer.Image.Width;
         hScroll.ValueChanged += new EventHandler(hScroll_ValueChanged);
         panel.Controls.Add(hScroll);
         hScroll.BringToFront();

         vScroll = new VScrollBar();
         vScroll.Dock = DockStyle.Left;
         vScroll.Location = new Point(100, 100);
         vScroll.Width *= 2;
         vScroll.Minimum = 0;
         vScroll.Maximum = viewer.Image.Height;
         vScroll.ValueChanged += new EventHandler(vScroll_ValueChanged);
         panel.Controls.Add(vScroll);
         vScroll.BringToFront();

         viewer.BringToFront();

         OnSizeChanged(EventArgs.Empty);
      }

      void vScroll_ValueChanged(object sender, EventArgs e)
      {
         viewer.ScrollPosition = new Point(hScroll.Value, vScroll.Value);
      }

      void hScroll_ValueChanged(object sender, EventArgs e)
      {
         viewer.ScrollPosition = new Point(hScroll.Value, vScroll.Value);
      }

      protected override void OnSizeChanged(EventArgs e)
      {
         if((hScroll != null) && (vScroll != null))
         {
            hScroll.SmallChange = viewer.AutoScrollSmallChange.Width;
            hScroll.LargeChange = viewer.AutoScrollLargeChange.Width;
            vScroll.SmallChange = viewer.AutoScrollSmallChange.Height;
            vScroll.LargeChange = viewer.AutoScrollLargeChange.Height;

            Console.WriteLine("AutoScrollSmallChange  {0}", viewer.AutoScrollSmallChange);
            Console.WriteLine("AutoScrollLargeChange  {0}", viewer.AutoScrollLargeChange);
            Console.WriteLine("AutoScrollMinSize      {0}", viewer.AutoScrollMinSize);
            Console.WriteLine("SmallScrollChangeRatio {0}", viewer.SmallScrollChangeRatio);
            Console.WriteLine("HScroll                {0}", viewer.HScroll);
            Console.WriteLine("VScroll                {0}", viewer.VScroll);
            Console.WriteLine("");

            hScroll.Enabled = viewer.HScroll;
            vScroll.Enabled = viewer.VScroll;
         }
         base.OnSizeChanged(e);
      }

   }

   public void RasterImageViewer_HScroll(string title)
   {
      MyForm3 form = new MyForm3(title);
      form.ShowDialog();
   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

RasterImageViewer Class
RasterImageViewer Members