Class ScrollBarBase

Represents a base class that is used to draw the Horizontal and Vertical scrollbars of the SfScrollControl.

Inheritance

System.Object

ScrollBarBase

HorizontalScrollBar

VerticalScrollBar

Namespace: Syncfusion.WinForms.Controls

Assembly: Syncfusion.Core.WinForms.dll

Syntax

public class ScrollBarBase : Control

Constructors

ScrollBarBase()

Initializes a new instance of the ScrollBarBase class.

Declaration

public ScrollBarBase()

ScrollBarBase(ScrollBars, ScrollBarStyleInfo)

Initializes a new instance of the ScrollBarBase class.

Declaration

public ScrollBarBase(ScrollBars type, ScrollBarStyleInfo style)

Parameters

Type	Name	Description
System.Windows.Forms.ScrollBars	type	The type of the scrollbar.
ScrollBarStyleInfo	style	The of the scroll bar.

Properties

AccessibilityEnabled

Gets or sets a value indicating whether the accessibility is enabled for the control or not.

Declaration

public bool AccessibilityEnabled { get; set; }

Property Value

Type	Description
System.Boolean

EnableMaximumArrow

Gets or sets a value indicating whether maximum arrow can be enabled or not. Default value is true.

Declaration

public bool EnableMaximumArrow { get; set; }

Property Value

Type	Description
System.Boolean

EnableMinimumArrow

Gets or sets a value indicating whether minimum arrow can be enabled or not. Default value is true.

Declaration

public bool EnableMinimumArrow { get; set; }

Property Value

Type	Description
System.Boolean

EnableThumb

Gets or sets a value indicating whether the scroll bar thumb can be enabled or not. Default value is true.

Declaration

public bool EnableThumb { get; set; }

Property Value

Type	Description
System.Boolean

LargeChange

Gets or sets a value to be added to or subtracted from the Value property when the scroll box is moved a large distance.

Declaration

public int LargeChange { get; set; }

Property Value

Type	Description
System.Int32

Remarks

When the user clicks the scroll bar, Maximum button or minimum button, the Value property changes according to the value set in the LargeChange property.

Maximum

Gets or sets the upper limit of values of the scrollable range.

Declaration

public int Maximum { get; set; }

Property Value

Type	Description
System.Int32

Minimum

Gets or sets the lower limit of values of the scrollable range.

Declaration

public int Minimum { get; set; }

Property Value

Type	Description
System.Int32

SmallChange

Gets or sets a value to be added or subtracted from the Value property when the scroll box is moved a small distance.

Declaration

public int SmallChange { get; set; }

Property Value

Type	Description
System.Int32

Remarks

When the user clicks the scroll bar, Maximum button or minimum button , the Value property changes according to the value set in the SmallChange property.

Style

Gets or sets the with settings that control the appearance of the scroll bar.

Declaration

public ScrollBarStyleInfo Style { get; set; }

Property Value

Type	Description
ScrollBarStyleInfo

Value

Gets or sets a numeric value that represents the current position of the scroll box on the scroll bar control.

Declaration

public int Value { get; set; }

Property Value

Type	Description
System.Int32

Methods

CalculateThumbDelta(Int32, Int32)

Used for calculating thumb offset.

Declaration

protected virtual void CalculateThumbDelta(int x, int y)

Parameters

Type	Name	Description
System.Int32	x	The X co-ordinate.
System.Int32	y	The Y co-ordinate.

CreateAccessibilityInstance()

Overridden to update the accessibility object of the SfScrollBar.

Declaration

protected override AccessibleObject CreateAccessibilityInstance()

Returns

Type	Description
System.Windows.Forms.AccessibleObject	Returns the accessibility object of the SfScrollBar.

Dispose(Boolean)

Releases the unmanaged resources.

Declaration

protected override void Dispose(bool disposing)

Parameters

Type	Name	Description
System.Boolean	disposing	Specifies whether to dispose the managed and unmanaged resources or only the unmanaged resource.

DrawArrow(Graphics, Rectangle, ScrollButton, ButtonState, ScrollBarStyleInfo)

Draws the arrow for the scrollbar button.

Declaration

protected virtual void DrawArrow(Graphics g, Rectangle rect, ScrollButton type, ButtonState state, ScrollBarStyleInfo style)

Parameters

Type	Name	Description
System.Drawing.Graphics	g	The System.Drawing.Graphics that used to draw the arrow..
System.Drawing.Rectangle	rect	The bounds of the arrow.
System.Windows.Forms.ScrollButton	type	The scroll button type.
System.Windows.Forms.ButtonState	state	The scroll button state.
ScrollBarStyleInfo	style	The Style of the scrollbar.

DrawScrollBarBackground(Graphics, Rectangle, ButtonState, ScrollBarStyleInfo)

Draws the background for the scrollbar.

Declaration

protected virtual void DrawScrollBarBackground(Graphics g, Rectangle bounds, ButtonState state, ScrollBarStyleInfo style)

Parameters

Type	Name	Description
System.Drawing.Graphics	g	The System.Drawing.Graphics object.
System.Drawing.Rectangle	bounds	The bounds of the scrollbar.
System.Windows.Forms.ButtonState	state	The state of the scrollbar.
ScrollBarStyleInfo	style	The Style of the scrollbar.

DrawThumbBackground(Graphics, Rectangle, ButtonState, ScrollBarStyleInfo)

Draws the background for the scrollbar Thumb.

Declaration

protected virtual void DrawThumbBackground(Graphics g, Rectangle rect, ButtonState state, ScrollBarStyleInfo style)

Parameters

Type	Name	Description
System.Drawing.Graphics	g	The System.Graphics object.
System.Drawing.Rectangle	rect	The bounds of the scroll button.
System.Windows.Forms.ButtonState	state	The state of the scroll button.
ScrollBarStyleInfo	style	The Style of the scrollbar.

GetMaxButton()

Gets max button.

Declaration

protected virtual ScrollButton GetMaxButton()

Returns

Type	Description
System.Windows.Forms.ScrollButton	Returns the max scroll button.

GetMinButton()

Gets min button.

Declaration

protected virtual ScrollButton GetMinButton()

Returns

Type	Description
System.Windows.Forms.ScrollButton	Returns the min scroll button.

GetStyle()

Gets the style of the ScrollBarStyleInfo.

Declaration

protected virtual ScrollBarStyleInfo GetStyle()

Returns

Type	Description
ScrollBarStyleInfo	Returns the ScrollBar style.

InitializeContextMenu(ContextMenu)

Initialize the context menu for the scrollbar.

Declaration

protected virtual void InitializeContextMenu(ContextMenu contextMenu)

Parameters

Type	Name	Description
System.Windows.Forms.ContextMenu	contextMenu	The context menu that need to be displayed.

InvalidateArrowRegion()

Invalidates the bounds of the arrow buttons.

Declaration

protected virtual void InvalidateArrowRegion()

InvalidateScrollBar()

Recalculates the bounds of the scrollbar.

Declaration

protected virtual void InvalidateScrollBar()

InvalidateThumbRegion()

Invalidates the bounds of the thumb region.

Declaration

protected virtual void InvalidateThumbRegion()

IsRightToLeft()

Gets a value indicating whether RightToLeft mode is enabled or not for scrollbar.

Declaration

protected bool IsRightToLeft()

Returns

Type	Description
System.Boolean	Returns true when the RTL is enabled otherwise return false.

OnLayout(LayoutEventArgs)

Recalculates the scrollbar regions when performs the layout.

Declaration

protected override void OnLayout(LayoutEventArgs e)

Parameters

Type	Name	Description
System.Windows.Forms.LayoutEventArgs	e	The System.Windows.Forms.LayoutEventArgs that contains event data.

OnMaximumClick(Object, EventArgs)

Raises the Scroll event when mouse click on maximum thumb region.

Declaration

protected virtual void OnMaximumClick(object sender, EventArgs e)

Parameters

Type	Name	Description
System.Object	sender	The object of the sender
System.EventArgs	e	An System.EventArgs that contains the event data.

OnMinimumClick(Object, EventArgs)

Raises the Scroll event when the mouse click on minimum thumb region.

Declaration

protected virtual void OnMinimumClick(object sender, EventArgs e)

Parameters

Type	Name	Description
System.Object	sender	The object of the sender
System.EventArgs	e	An System.EventArgs that contains the event data.

OnMouseDown(MouseEventArgs)

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

Declaration

protected override void OnMouseDown(MouseEventArgs e)

Parameters

Type	Name	Description
System.Windows.Forms.MouseEventArgs	e	The System.Windows.Forms.MouseEventArgs that contains event data.

OnMouseEnter(EventArgs)

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

Declaration

protected override void OnMouseEnter(EventArgs e)

Parameters

Type	Name	Description
System.EventArgs	e	An System.EventArgs that contains event data.

OnMouseLeave(EventArgs)

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

Declaration

protected override void OnMouseLeave(EventArgs e)

Parameters

Type	Name	Description
System.EventArgs	e	An System.EventArgs that contains event data.

OnMouseMove(MouseEventArgs)

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

Declaration

protected override void OnMouseMove(MouseEventArgs e)

Parameters

Type	Name	Description
System.Windows.Forms.MouseEventArgs	e	The System.Windows.Forms.MouseEventArgs that contains event data.

OnMouseUp(MouseEventArgs)

Performs the scrolling on the System.Windows.Forms.Control.MouseUp event.

Declaration

protected override void OnMouseUp(MouseEventArgs e)

Parameters

Type	Name	Description
System.Windows.Forms.MouseEventArgs	e	The System.Windows.Forms.MouseEventArgs that contains event data.

OnPageDownRightClick(Object, EventArgs)

Raises the Scroll event mouse click on bottom right thumb region.

Declaration

protected virtual void OnPageDownRightClick(object sender, EventArgs e)

Parameters

Type	Name	Description
System.Object	sender	The object of the sender
System.EventArgs	e	An System.EventArgs that contains the event data.

OnPageUpLeftClick(Object, EventArgs)

Raises the Scroll event when the mouse click on top left thumb region.

Declaration

protected virtual void OnPageUpLeftClick(object sender, EventArgs e)

Parameters

Type	Name	Description
System.Object	sender	The object of the sender
System.EventArgs	e	An System.EventArgs that contains the event data.

OnPaint(PaintEventArgs)

Draws the Scrollbar components based on the Style value.

Declaration

protected override void OnPaint(PaintEventArgs e)

Parameters

Type	Name	Description
System.Windows.Forms.PaintEventArgs	e	The System.Windows.Forms.PaintEventArgs that contains event data.

OnRightToLeftChanged(EventArgs)

Redraws the scroll control when RightToLeft is changed.

Declaration

protected override void OnRightToLeftChanged(EventArgs e)

Parameters

Type	Name	Description
System.EventArgs	e	An System.EventArgs that contains event data.

OnScroll(ScrollEventArgs)

Raise the Scroll event.

Declaration

protected virtual void OnScroll(ScrollEventArgs e)

Parameters

Type	Name	Description
System.Windows.Forms.ScrollEventArgs	e	The System.Windows.Forms.ScrollEventArgs that contains event data.

OnScrollDownRightClick(Object, EventArgs)

Raises the Scroll event when the mouse click on down left thumb region.

Declaration

protected virtual void OnScrollDownRightClick(object sender, EventArgs e)

Parameters

Type	Name	Description
System.Object	sender	The object of the sender
System.EventArgs	e	An System.EventArgs that contains the event data.

OnScrollHereClick(Object, EventArgs)

Raises the mouse click on the scrollbar.

Declaration

protected virtual void OnScrollHereClick(object sender, EventArgs e)

Parameters

Type	Name	Description
System.Object	sender	The object of the sender
System.EventArgs	e	An System.EventArgs that contains the event data.

OnScrollUpLeftClick(Object, EventArgs)

Raises Scroll event when the mouse click on top left thumb region.

Declaration

protected virtual void OnScrollUpLeftClick(object sender, EventArgs e)

Parameters

Type	Name	Description
System.Object	sender	The object of the sender
System.EventArgs	e	An System.EventArgs that contains the event data.

OnSizeChanged(EventArgs)

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

Declaration

protected override void OnSizeChanged(EventArgs e)

Parameters

Type	Name	Description
System.EventArgs	e	An System.EventArgs that contains event data.

OnThumbPositionChanged(Int32, Int32)

Occurs when the scrollbar thumb is dragged.

Declaration

protected virtual void OnThumbPositionChanged(int x, int y)

Parameters

Type	Name	Description
System.Int32	x	The X co-ordinates.
System.Int32	y	The Y co-ordinates.

OnValueChanged(EventArgs)

Raises the ValueChanged event.

Declaration

protected virtual void OnValueChanged(EventArgs e)

Parameters

Type	Name	Description
System.EventArgs	e	An System.EventArgs that contains event data.

PointToValue(Int32, Int32)

Gets the value of the scrollbar at the given point.

Declaration

protected virtual int PointToValue(int x, int y)

Parameters

Type	Name	Description
System.Int32	x	The X co-ordinate.
System.Int32	y	The Y co-ordinate.

Returns

Type	Description
System.Int32	Returns the value of the scrollbar.

Events

ContextMenuShowing

Occurs when the context menu is showing for the control.

Declaration

public event ContextMenuShowingEventHandler ContextMenuShowing

Event Type

Type	Description
ContextMenuShowingEventHandler

Scroll

Occurs when the scrolling is performed.

Declaration

public event ScrollEventHandler Scroll

Event Type

Type	Description
System.Windows.Forms.ScrollEventHandler

ValueChanged

Occurs when the Value property is changed.

Declaration

public event EventHandler ValueChanged

Event Type

Type	Description
System.EventHandler