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Class ScrollControl - WindowsForms API Reference | Syncfusion

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    Class ScrollControl

    Represents a base class for the controls that supports scrolling.

    Inheritance
    System.Object
    ScrollControl
    HybridScrollControl
    Namespace: Syncfusion.Windows.Forms.Edit
    Assembly: Syncfusion.Edit.Windows.dll
    Syntax
    public class ScrollControl : Control
    Remarks

    The ScrollControl class acts as a base class for controls that require the ability to scroll. To allow a control to display scroll bars as needed, set the AutoScroll property to true. To select which scroll bars should be visible, set the VScroll and HScroll properties.

    You can also associate stand-alone scrollbars with the ScrollControl. The VertScrollBar and HorizScrollBar properties allow you to associate external scrollbars. This is of benefit if you want to share one scrollbar with a parent control. For example, if the ScrollControl is a view inside a workbook or dynamic splitter frame.

    ScrollControl supports automatic scrolling when the user drags the mouse. In a grid when the user starts selecting cells the user can drag the mouse outside the grid area and the grid will automatically scroll. To enable auto scrolling, override the OnMouseDown event in your derived control and initialize the AutoScrolling, AutoScrollBounds and InsideScrollBounds properties.

    When the user scrolls your control and holds down the mouse on the down or up arrow of the scrollbar, the scrolling speed will accelerate.

    The FixRenderOrigin method will ensure correct initialization of the rendering origin for brushes and patterns. You can call FixRenderOrigin from your control's OnPaint method. ScrollControl supports scrolling with the mouse wheel and also cooperates fine with with the IntelliMouseDragScroll class.

    If you want to provide context information about your control and change the cursor on the fly while the user moves the mouse, set the OverrideCursor property to the cursor you want to show. Instead you can also implement IMouseController and add the object to MouseControllerDispatcher.

    Constructors

    ScrollControl()

    Initializes a new instance of ScrollControl class.

    Declaration
    public ScrollControl()

    Properties

    BorderStyle

    Gets or sets the border style of the control.

    Declaration
    public BorderStyle BorderStyle { get; set; }
    Property Value
    Type Description
    System.Windows.Forms.BorderStyle

    CreateParams

    Overriden. Changes System.Windows.Forms.CreateParams.Style to show or hide scrollbars and also consider the controls BorderStyle setting.

    Declaration
    protected override CreateParams CreateParams { get; }
    Property Value
    Type Description
    System.Windows.Forms.CreateParams

    DisableScrollWindow

    Gets or sets a value indicating whether to specify the setting if the window should be scrolled when ScrollWindow is called.

    Declaration
    public bool DisableScrollWindow { get; set; }
    Property Value
    Type Description
    System.Boolean
    Remarks

    If DisableScrollWindow is true any calls to the ScrollWindow method will simply invalidate the affect region. The rendering origin will still be recorded correctly and WindowScrolling and WindowScrolled events will be raised.

    If DisableScrollWindow is false ScrollWindow will scroll the contents of the control.

    If DisableScrollWindow will return true if BeginUpdate was called without the BeginUpdateOptions.ScrollWindow option.

    See Also
    ScrollControl.BeginUpdate
    ScrollControl.Updating
    ScrollControl.ScrollWindow

    DiscardPaintMessagesAfterBeginUpdate

    Gets or sets a value indicating Whether you can call BeginUpdate() the control by default that does not handle WM_PAINT messages. Only once you call EndUpdate they will be processed. If this causes problems in your application, you can set this static property to true. In such cases WM_PAINT messages will be simply discarded and any invalid regions will be validated.

    Declaration
    public static bool DiscardPaintMessagesAfterBeginUpdate { get; set; }
    Property Value
    Type Description
    System.Boolean
    Remarks

    There is a problem with the default implementation of BeginUpdate. If a screen region is marked invalid the WndProc will be repeatedly called with WM_PAINT at the the top of the WndProc until EndUpdate is called. This can cause your application to freeze if another window gets created or if you make a web service call and WndProc messages need to be processed.

    Setting DiscardPaintMessagesAfterBeginUpdate = true will help avoid these scenarios.

    HasControlFocus

    Gets or sets a value indicating whether the OnControlGotFocus() has been called. OnControlLostFocus() resets this flag.

    Declaration
    public bool HasControlFocus { get; }
    Property Value
    Type Description
    System.Boolean

    HorizontalScrollTips

    Gets or sets a value indicating whether the control should show scroll tips while the user is dragging a horizontal scrollbars thumb.

    Declaration
    public virtual bool HorizontalScrollTips { get; set; }
    Property Value
    Type Description
    System.Boolean

    HorizontalThumbTrack

    Gets or sets a value indicating whether the control should scroll while the user is dragging a horizontal scrollbars thumb.

    Declaration
    public virtual bool HorizontalThumbTrack { get; set; }
    Property Value
    Type Description
    System.Boolean

    HScroll

    Gets or sets a value indicating whether the horizontal scroll bar is visible or not.

    Declaration
    public bool HScroll { get; set; }
    Property Value
    Type Description
    System.Boolean

    true if the horizontal scroll bar is visible; otherwise, false.

    See Also
    System.Windows.Forms.ScrollableControl.HScroll

    HScrollBar

    Gets a reference to an object with horizontal scrollbar settings of the control.

    Declaration
    public ScrollBarWrapper HScrollBar { get; }
    Property Value
    Type Description
    ScrollBarWrapper

    IgnoreUICues

    ScrollControlMouseController checks this to see if it should cancel existing mouse operation and call ScrollControlMouseController.CancelMode when a UICuesChanged event is sent. That can happen when user activates another application or simply when styles for a child window have changed.

    Declaration
    public bool IgnoreUICues { get; set; }
    Property Value
    Type Description
    System.Boolean

    InsideScrollMargins

    Gets or sets the default margins for the scrolling area when the user moves the mouse to the margin between InsideScrollBounds and AutoScrollBounds.

    Declaration
    public Size InsideScrollMargins { get; set; }
    Property Value
    Type Description
    System.Drawing.Size

    IsActiveControl

    Gets or sets a value indicating whether the OnEnter(EventArgs) has been called. OnLeave(EventArgs) resets this flag.

    Declaration
    public bool IsActiveControl { get; }
    Property Value
    Type Description
    System.Boolean

    IsDeactivated

    Gets or sets a value indicating whether the OnDeactivated(EventArgs) has been called. OnEnter(EventArgs) resets this flag.

    Declaration
    public bool IsDeactivated { get; }
    Property Value
    Type Description
    System.Boolean

    IsValidated

    Gets or sets a value indicating whether the OnValidated(EventArgs) method has been called. OnLeave(EventArgs) and OnEnter(EventArgs) reset this flag.

    Declaration
    public bool IsValidated { get; }
    Property Value
    Type Description
    System.Boolean

    IsValidating

    Gets or sets a value indicating whether the OnValidating(CancelEventArgs) method has been called. OnLeave(EventArgs) and OnEnter(EventArgs) reset this flag.

    Declaration
    public bool IsValidating { get; }
    Property Value
    Type Description
    System.Boolean

    LastMousePosition

    Gets or sets the mouse position point(Control.MousePosition) of the control. The variable is before any WM_MOUSE* messages are processed.

    Declaration
    public Point LastMousePosition { get; set; }
    Property Value
    Type Description
    System.Drawing.Point

    PaintPending

    Gets or sets a value indicating whether it contains pending updates for the control when painting is suspended with BeginUpdate.

    Declaration
    public bool PaintPending { get; }
    Property Value
    Type Description
    System.Boolean

    PaneDesc

    Gets the pane information.

    Declaration
    public virtual string PaneDesc { get; }
    Property Value
    Type Description
    System.String

    PreJitPaint

    Lets you specify if the time the first time the control is drawn should be optimized by calling OnPaint before the control is made visible and so that all relevant code for drawing has been jitted.

    Declaration
    protected bool PreJitPaint { get; set; }
    Property Value
    Type Description
    System.Boolean

    Size

    Gets or sets the size of Scrollable control.

    Declaration
    public Size Size { get; set; }
    Property Value
    Type Description
    System.Drawing.Size

    SupportsThumbTrack

    Gets or sets a value indicating whether the control should scroll while the user is dragging a scrollbars thumb.

    Declaration
    [Obsolete("Use VerticalThumbTrack and HorizontalThumbTrack properties instead.")]
    public bool SupportsThumbTrack { get; set; }
    Property Value
    Type Description
    System.Boolean

    TabIndex

    Gets or sets the tab order of the control within its container.

    Declaration
    public int TabIndex { get; set; }
    Property Value
    Type Description
    System.Int32

    UpdateOptions

    Gets the settings for the current BeginUpdate option.

    Declaration
    public virtual BeginUpdateOptions UpdateOptions { get; }
    Property Value
    Type Description
    BeginUpdateOptions

    Updating

    Gets or sets a value indicating whether the BeginUpdate() has been called and the painting for a control is suspended.

    Declaration
    public bool Updating { get; }
    Property Value
    Type Description
    System.Boolean

    UseSharedScrollBars

    Gets or sets a value indicating whether the shared scrollbars should be enabled or not. Use this if the control is not embedded in a container control that implements IScrollBarFrame and you want to provide your own scrollbars.

    Declaration
    public bool UseSharedScrollBars { get; set; }
    Property Value
    Type Description
    System.Boolean

    VerticalScrollTips

    Gets or sets a value indicating whether the control should show scroll tips while the user is dragging a vertical scrollbars thumb.

    Declaration
    public virtual bool VerticalScrollTips { get; set; }
    Property Value
    Type Description
    System.Boolean

    VerticalThumbTrack

    Gets or sets a value indicating whether the control should scroll while the user is dragging a vertical scrollbars thumb.

    Declaration
    public virtual bool VerticalThumbTrack { get; set; }
    Property Value
    Type Description
    System.Boolean

    VScroll

    Gets or sets a value indicating whether the vertical scroll bar is visible or not.

    Declaration
    public bool VScroll { get; set; }
    Property Value
    Type Description
    System.Boolean

    true if the vertical scroll bar is visible; otherwise, false.

    See Also
    System.Windows.Forms.ScrollableControl.HScroll

    VScrollBar

    Gets a reference to an object with vertical scrollbar settings of the control.

    Declaration
    public ScrollBarWrapper VScrollBar { get; }
    Property Value
    Type Description
    ScrollBarWrapper

    Methods

    BeginUpdate()

    Suspends the painting of the control until the EndUpdate method is called.

    Declaration
    public void BeginUpdate()
    Remarks

    When many paint are made to the appearance of a control you should invoke the BeginUpdate method to temporarily freeze the drawing of the control. This results in less distraction to the user, and a performance gain. After all updates have been made, invoke the EndUpdate method to resume drawing of the control.

    BeginUpdate(BeginUpdateOptions)

    Suspends the painting of the control until the EndUpdate method is called.

    Declaration
    public virtual void BeginUpdate(BeginUpdateOptions options)
    Parameters
    Type Name Description
    BeginUpdateOptions options

    Specifies the painting support during the BeginUpdate, EndUpdate batch.

    Remarks

    When many paint are made to the appearance of a control you should invoke the BeginUpdate method to temporarily freeze the drawing of the control. This results in less distraction to the user, and a performance gain. After all updates have been made, invoke the EndUpdate method to resume drawing of the control.

    Pass BeginUpdateOptions if you do not want to do a complete Refresh of the control and instead want to have certain regions of your control be invalidated or scroll the contents of control.

    If you call BeginUpdate() and then later EndUpdate() the control will know if a paint is pending and only refresh the control if a paint is pending. Either call to ShouldPrepareUpdate, Invalidate or a WM_PAINT message during the BeginUpdate EndUpdate block will signal the control that a paint is pending.
    See Also
    ScrollControl.ShouldPrepareUpdate
    ScrollControl.EndUpdate

    CancelUpdate()

    Cancels any prior BeginUpdate calls.

    Declaration
    public void CancelUpdate()
    See Also
    ScrollControl.BeginUpdate

    Dispose(Boolean)

    Releases the unmanaged resources used by the Control and its child controls and optionally releases the managed resources.

    Declaration
    protected override void Dispose(bool disposing)
    Parameters
    Type Name Description
    System.Boolean disposing

    True to release both managed and unmanaged resources; false to release only unmanaged resources.

    EndUpdate()

    Resumes the painting of the control suspended by calling the BeginUpdate method.

    Declaration
    public void EndUpdate()
    Remarks

    When many paint are made to the appearance of a control you should invoke the BeginUpdate method to temporarily freeze the drawing of the control. This results in less distraction to the user, and a performance gain. After all updates have been made, invoke the EndUpdate method to resume drawing of the control.

    See Also
    ScrollControl.BeginUpdate

    EndUpdate(Boolean)

    Resumes the painting of the control suspended by calling the BeginUpdate method.

    Declaration
    public virtual void EndUpdate(bool update)
    Parameters
    Type Name Description
    System.Boolean update

    Updated when set to true.

    Remarks

    When many paint are made to the appearance of a control you should invoke the BeginUpdate method to temporarily freeze the drawing of the control. This results in less distraction to the user, and a performance gain. After all updates have been made, invoke the EndUpdate method to resume drawing of the control.

    EnsurePaintCodeJitted(Boolean)

    This method checks if the control is visible, a window handle has been created and if it has not been drawn before, it calls OnEnsurePaintCodeJitted().

    Declaration
    public void EnsurePaintCodeJitted(bool ignoreVisible)
    Parameters
    Type Name Description
    System.Boolean ignoreVisible

    Set this true if you want to force a call to OnEnsurePaintCodeJitted() even if the control is not visible and/or no window handle has been created.

    FixRenderOrigin(Graphics)

    Call this method from your controls OnPaint method to ensure correct rendering origin for brushes and patterns.

    Declaration
    protected void FixRenderOrigin(Graphics g)
    Parameters
    Type Name Description
    System.Drawing.Graphics g

    The graphics object.

    LastMousePositionToClient()

    Computes the location of the specified screen point into client coordinates.

    Declaration
    public Point LastMousePositionToClient()
    Returns
    Type Description
    System.Drawing.Point

    PointToClient(LastMousePosition).

    OnBeginUpdateScrollBars()

    Call BeginUpdate() for both scrollbars.

    Declaration
    protected virtual void OnBeginUpdateScrollBars()

    OnControlAdded(ControlEventArgs)

    Performs control adding-related operations.

    Declaration
    protected override void OnControlAdded(ControlEventArgs e)
    Parameters
    Type Name Description
    System.Windows.Forms.ControlEventArgs e

    ControlEventArgs.

    OnControlGotFocus()

    Raises the System.Windows.Forms.Control.GotFocus event. This method is called when the control or any child control got focus and this control did not have focus before.

    Declaration
    protected virtual void OnControlGotFocus()
    Remarks

    Inheriting classed should override this method instead of overriding System.Windows.Forms.Control.OnGotFocus(System.EventArgs) because OnControlGotFocus() is also called when child controls got focus and it is not called when focus is moved within child controls of this control.

    OnControlLostFocus()

    Raises the System.Windows.Forms.Control.LostFocus event. This method is called when the control or any child control looses focus and the new focused control is not a child of this control.

    Declaration
    protected virtual void OnControlLostFocus()
    Remarks

    Inheriting classed should override this method instead of overriding System.Windows.Forms.Control.OnLostFocus(System.EventArgs) because OnControlLostFocus() is also called when child controls loose focus and it is not called when focus is moved within child controls of this control.

    OnControlRemoved(ControlEventArgs)

    Performs control removing-related operations.

    Declaration
    protected override void OnControlRemoved(ControlEventArgs e)
    Parameters
    Type Name Description
    System.Windows.Forms.ControlEventArgs e

    ControlEventArgs.

    OnDeactivated(EventArgs)

    Raises the Deactivated event.

    Declaration
    protected virtual void OnDeactivated(EventArgs e)
    Parameters
    Type Name Description
    System.EventArgs e

    A System.EventArgs that contains the event data.

    OnEndUpdateScrollBars()

    Call EndUpdate() for both scrollbars.

    Declaration
    protected virtual void OnEndUpdateScrollBars()

    OnEnsurePaintCodeJitted()

    This method is called to reduce the time the first time the control is drawn. Calling OnPaint before the control is made visible ensures that all relevant code for drawing has been jitted.

    Declaration
    protected virtual void OnEnsurePaintCodeJitted()

    OnEnter(EventArgs)

    Performs mouse entering-related operations.

    Declaration
    protected override void OnEnter(EventArgs e)
    Parameters
    Type Name Description
    System.EventArgs e

    EventArgs.

    OnGotFocus(EventArgs)

    OnGotFocus.

    Declaration
    protected override void OnGotFocus(EventArgs e)
    Parameters
    Type Name Description
    System.EventArgs e

    EventArgs.

    OnHandleCreated(EventArgs)

    Performs handle creating-related operations.

    Declaration
    protected override void OnHandleCreated(EventArgs e)
    Parameters
    Type Name Description
    System.EventArgs e

    EventArgs.

    OnHScroll(Object, ScrollEventArgs)

    Called when horizontal scrolling is being performed.

    Declaration
    protected virtual void OnHScroll(object sender, ScrollEventArgs se)
    Parameters
    Type Name Description
    System.Object sender

    Sender.

    System.Windows.Forms.ScrollEventArgs se

    ScrollEventArgs.

    OnInvalidated(InvalidateEventArgs)

    Overriden. See System.Windows.Forms.Control.Invalidated event.

    Declaration
    protected override void OnInvalidated(InvalidateEventArgs e)
    Parameters
    Type Name Description
    System.Windows.Forms.InvalidateEventArgs e

    An System.Windows.Forms.InvalidateEventArgs that contains the event data.

    OnLeave(EventArgs)

    Performs mouse leaving-related operations.

    Declaration
    protected override void OnLeave(EventArgs e)
    Parameters
    Type Name Description
    System.EventArgs e

    EventArgs

    OnLocationChanged(EventArgs)

    Performs location changing-related operations.

    Declaration
    protected override void OnLocationChanged(EventArgs e)
    Parameters
    Type Name Description
    System.EventArgs e

    EventArgs.

    OnLostFocus(EventArgs)

    Performs focus loosing-related operations.

    Declaration
    protected override void OnLostFocus(EventArgs e)
    Parameters
    Type Name Description
    System.EventArgs e

    EventArgs.

    OnPaint(PaintEventArgs)

    Performs painting-related operations.

    Declaration
    protected override void OnPaint(PaintEventArgs e)
    Parameters
    Type Name Description
    System.Windows.Forms.PaintEventArgs e

    PaintEventArgs.

    OnParentChanged(EventArgs)

    Performs parent changing-related operations.

    Declaration
    protected override void OnParentChanged(EventArgs e)
    Parameters
    Type Name Description
    System.EventArgs e

    EventArgs.

    OnScrollbarsVisibleChanged(EventArgs)

    This method fires the ScrollbarsVisibleChanged

    Declaration
    protected virtual void OnScrollbarsVisibleChanged(EventArgs e)
    Parameters
    Type Name Description
    System.EventArgs e

    A System.EventArgs that contains the event data.

    OnSizeChanged(EventArgs)

    Performs size changing-related operations.

    Declaration
    protected override void OnSizeChanged(EventArgs e)
    Parameters
    Type Name Description
    System.EventArgs e

    EventArgs.

    OnUpdatingChanged(EventArgs)

    Raises the UpdatingChanged event.

    Declaration
    protected virtual void OnUpdatingChanged(EventArgs e)
    Parameters
    Type Name Description
    System.EventArgs e

    A System.EventArgs that contains the event data.

    Remarks

    The event handler for this event can check Updating to determine if ScrollControl.BeginUpdate or ScrollControl.EndUpdate was called.

    OnValidated(EventArgs)

    Performs validating-related operations.

    Declaration
    protected override void OnValidated(EventArgs e)
    Parameters
    Type Name Description
    System.EventArgs e

    EventArgs.

    OnValidating(CancelEventArgs)

    Performs validating-related operations.

    Declaration
    protected override void OnValidating(CancelEventArgs e)
    Parameters
    Type Name Description
    System.ComponentModel.CancelEventArgs e

    CancelEventArgs.

    OnValidatingLostFocus()

    This method is called if the controls OnControlLostFocus() notification occurs while handling a System.Windows.Forms.Control.Validating event. This typically occurs if a message box is displayed from a System.Windows.Forms.Control.Validating event handler.

    Declaration
    protected virtual void OnValidatingLostFocus()

    OnVisibleChanged(EventArgs)

    Performs visibility changing-related operations.

    Declaration
    protected override void OnVisibleChanged(EventArgs e)
    Parameters
    Type Name Description
    System.EventArgs e

    EventArgs.

    OnVScroll(Object, ScrollEventArgs)

    Called when vertical scrolling is being performed.

    Declaration
    protected virtual void OnVScroll(object sender, ScrollEventArgs se)
    Parameters
    Type Name Description
    System.Object sender

    Sender.

    System.Windows.Forms.ScrollEventArgs se

    ScrollEventArgs.

    ProcessMouseWheel(MouseEventArgs)

    Raises the System.Windows.Forms.Control.MouseWheel event.

    Declaration
    public void ProcessMouseWheel(MouseEventArgs e)
    Parameters
    Type Name Description
    System.Windows.Forms.MouseEventArgs e

    A MouseEventArgs that holds event data.

    Remarks
    public class GridTextBox: RichTextBox
    {
    	private GridTextBoxCell parent;
    	protected override void OnMouseWheel(MouseEventArgs e)
    	{
    		parent.Grid.ProcessMouseWheel(e);
    	}
    }

    QueryFocusInside()

    Determines whether this control contains focus. Override this method if you want to show dropdown windows and indicate the control has not lost focus when the dropdown is shown.

    Declaration
    public virtual bool QueryFocusInside()
    Returns
    Type Description
    System.Boolean

    true if the control or any child control has focus; false otherwise.

    ScrollWindow(Int32, Int32, Rectangle, Rectangle)

    Scrolls the contents of the control like the ScrollWindow Windows API.

    Declaration
    public Rectangle ScrollWindow(int xAmount, int yAmount, Rectangle rect, Rectangle clipRect)
    Parameters
    Type Name Description
    System.Int32 xAmount

    Amount to scroll by x.

    System.Int32 yAmount

    Amount to scroll by y.

    System.Drawing.Rectangle rect

    Rectangle to scroll.

    System.Drawing.Rectangle clipRect

    Clip.

    Returns
    Type Description
    System.Drawing.Rectangle

    Updated rectangle.

    Remarks

    The method will raise a WindowScrolling event before the contents are scrolled and a WindowScrolled event after the contents have been scrolled.

    If DisableScrollWindow is true any calls to the ScrollWindow method will simply invalidate the affect region. The rendering origin will still be recorded correctly and WindowScrolling and WindowScrolled events will be raised.

    If DisableScrollWindow is false ScrollWindow will scroll the contents of the control.

    ShouldPrepareUpdate()

    Call this method to check if you should do any update calculations for the view in your control and to notify scrollcontrol that the controls content need to be updated.

    Declaration
    public bool ShouldPrepareUpdate()
    Returns
    Type Description
    System.Boolean

    true if you should invalidate areas that need to be redrawn; false if a complete Refresh for the control is pending and therefore invalidating the view is not necessary.

    ShouldPrepareUpdate(Boolean)

    Call this method to check if you should do any update calculations for the view in your control and to notify scrollcontrol that the controls content need to be updated.

    Declaration
    public bool ShouldPrepareUpdate(bool markPaintPending)
    Parameters
    Type Name Description
    System.Boolean markPaintPending

    If markPaintPending is true ScrollControl will assume the control needs to be repainted in a subsequent EndUpdate call.

    Returns
    Type Description
    System.Boolean

    true if you should Invalidate regions to be repainted in your control. It will return false if a complete Refresh of the control is pending and you don't need to invalidate individual regions of your control.

    UpdateScrollBars()

    Update scrollbars to reflect recent changes in scroll position, minimum and maximum scroll position values.

    Declaration
    public virtual void UpdateScrollBars()

    WndProc(ref Message)

    Processes Windows messages.

    Declaration
    protected override void WndProc(ref Message msg)
    Parameters
    Type Name Description
    System.Windows.Forms.Message msg

    The Windows Message to process.

    Events

    Deactivated

    Occurs when both OnControlLostFocus() and OnLeave(EventArgs) occured.

    Declaration
    public event EventHandler Deactivated
    Event Type
    Type Description
    System.EventHandler

    HorizontalScroll

    Occurs when horizontal scrolling is being performed.

    Declaration
    public event ScrollEventHandler HorizontalScroll
    Event Type
    Type Description
    System.Windows.Forms.ScrollEventHandler

    UpdatingChanged

    Occurs when ScrollControl.BeginUpdate has been called the first time or ScrollControl.EndUpdate has been called the last time.

    Declaration
    public event EventHandler UpdatingChanged
    Event Type
    Type Description
    System.EventHandler

    VerticalScroll

    Occurs when vertical scrolling is being performed.

    Declaration
    public event ScrollEventHandler VerticalScroll
    Event Type
    Type Description
    System.Windows.Forms.ScrollEventHandler
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