Class TreeNodesScrollAxis

TreeNodesScrollAxis provides support for vertical pixel scrolling through nodes in a TreeModel of a VirtualTreeView with its ScrollRows property.

The axis provides the mapping between a row index or pixel position in the VirtualTreeView and the TreeNodes and vice versa.

The TreeNodes maintain their IsExpanded state and also keep track of the height of themselves and their child nodes in a TreeTable that counts the number of nested child nodes and their height.

The axis listens to scrollbar events, resizing and hiding of nodes and updates scrollbar properties with setting calculated from header and footer size and total size of lines in body.

Inheritance

System.Object

ScrollAxisBase

TreeNodesScrollAxis

Implements

System.IDisposable

Inherited Members

ScrollAxisBase.AnyVisibleLines(Int32, Int32)

ScrollAxisBase.Changed

ScrollAxisBase.Clip

ScrollAxisBase.Dispose()

ScrollAxisBase.Dispose(Boolean)

ScrollAxisBase.FirstFooterLineIndex

ScrollAxisBase.FooterLineCount

ScrollAxisBase.FreezeVisibleLines()

ScrollAxisBase.GetBorderRangeClipPoints(VisibleLineInfo, VisibleLineInfo)

ScrollAxisBase.GetClipPoints(ScrollAxisRegion)

ScrollAxisBase.GetLineNearCorner(Double, Double)

ScrollAxisBase.GetLineNearCorner(Double, Double, CornerSide)

ScrollAxisBase.GetLinesAndVisibility(Int32, Int32, Boolean, Boolean, Boolean, VisibleLineInfo, VisibleLineInfo)

ScrollAxisBase.GetLineSize(Int32)

ScrollAxisBase.GetLineSize(Int32, Int32)

ScrollAxisBase.GetNextPage(Int32)

ScrollAxisBase.GetOriginAndCornerOfBodyRegion(Double, Double)

ScrollAxisBase.GetPreviousPage(Int32)

ScrollAxisBase.GetScrollLinesHostSize(Int32, Int32)

ScrollAxisBase.GetVisibleLineAtLineIndex(Int32)

ScrollAxisBase.GetVisibleLineAtLineIndex(Int32, Boolean)

ScrollAxisBase.GetVisibleLineAtPoint(Double)

ScrollAxisBase.GetVisibleLines()

ScrollAxisBase.GetVisibleLinesClipPoints(Int32, Int32)

ScrollAxisBase.GetVisibleLinesRange(Int32)

ScrollAxisBase.GetVisibleSection(Int32, Int32, Int32)

ScrollAxisBase.GetVisibleSection(ScrollAxisRegion, Int32, Int32)

ScrollAxisBase.HeaderLineCount

ScrollAxisBase.IsFooterVisible

ScrollAxisBase.IsLineVisible(Int32)

ScrollAxisBase.LastBodyVisibleLine

ScrollAxisBase.LastBodyVisibleLineIndex

ScrollAxisBase.MarkDirty()

ScrollAxisBase.OnLinesInserted(Int32, Int32)

ScrollAxisBase.OnLinesRemoved(Int32, Int32)

ScrollAxisBase.RaiseChanged()

ScrollAxisBase.RenderSize

ScrollAxisBase.ResetLineResize()

ScrollAxisBase.ResetVisibleLines()

ScrollAxisBase.ScrollBar

ScrollAxisBase.ScrollInView(Int32)

ScrollAxisBase.ScrollInView(Int32, Double)

ScrollAxisBase.ScrollLinesHost

ScrollAxisBase.ScrollPageSize

ScrollAxisBase.SetLineResize(Int32, Double)

ScrollAxisBase.StartLineIndex

ScrollAxisBase.UnfreezeVisibleLines()

ScrollAxisBase.UpdateScrollBar(Boolean)

ScrollAxisBase.ViewCorner

ScrollAxisBase.VisiblePointToLineIndex(Double)

ScrollAxisBase.VisiblePointToLineIndex(Double, Boolean)

Namespace: Syncfusion.Windows.Controls.VirtualTreeView

Assembly: Syncfusion.GridCommon.WPF.dll

Syntax

public class TreeNodesScrollAxis : ScrollAxisBase, IDisposable

Constructors

TreeNodesScrollAxis(IScrollBar, TreeModel)

Initializes a new instance of the TreeNodesScrollAxis class.

Declaration

public TreeNodesScrollAxis(IScrollBar sb, TreeModel treeModel)

Parameters

Type	Name	Description
IScrollBar	sb	The sb.
TreeModel	treeModel	The tree model.

Properties

DefaultLineSize

Gets or sets the default size of lines.

Declaration

public override double DefaultLineSize { get; set; }

Property Value

Type	Description
System.Double	The default size of lines.

Overrides

ScrollAxisBase.DefaultLineSize

FooterExtent

Gets the footer extent. This is total height (or width) of the footer lines.

Declaration

public override double FooterExtent { get; }

Property Value

Type	Description
System.Double	The footer extent.

Overrides

ScrollAxisBase.FooterExtent

HeaderExtent

Gets the header extent. This is total height (or width) of the header lines.

Declaration

public override double HeaderExtent { get; }

Property Value

Type	Description
System.Double	The header extent.

Overrides

ScrollAxisBase.HeaderExtent

IsPixelScroll

Gets a value indicating whether this axis supports pixel scrolling.

Declaration

public override bool IsPixelScroll { get; }

Property Value

Type	Description
System.Boolean	true if this instance supports pixel scrolling; otherwise, false.

Overrides

ScrollAxisBase.IsPixelScroll

LineCount

Gets or sets the line count.

Declaration

public override int LineCount { get; set; }

Property Value

Type	Description
System.Int32	The line count.

Overrides

ScrollAxisBase.LineCount

ScrollLineIndex

Gets or sets the index of the first visible Line in the Body region.

Declaration

public override int ScrollLineIndex { get; set; }

Property Value

Type	Description
System.Int32	The index of the scroll line.

Overrides

ScrollAxisBase.ScrollLineIndex

TotalExtent

Gets the total extent.

Declaration

public double TotalExtent { get; }

Property Value

Type	Description
System.Double	The total extent.

ViewSize

Gets the view size of the (either height or width) of the parent control. Normally the ViewSize is the same as RenderSize. Only if the parent control has more space then needed to display all lines, the ViewSize will be less. In such case the ViewSize is the total height for all lines.

Declaration

public override double ViewSize { get; }

Property Value

Type	Description
System.Double	The size of the view.

Overrides

ScrollAxisBase.ViewSize

VisibleNodes

Gets the visible nodes.

Declaration

public TreeNodesFlattenedList VisibleNodes { get; }

Property Value

Type	Description
TreeNodesFlattenedList	The visible nodes.

Methods

AlignScrollLine()

Aligns the scroll line.

Declaration

public override void AlignScrollLine()

Overrides

ScrollAxisBase.AlignScrollLine()

GetNextScrollLineIndex(Int32)

Gets the index of the next scroll line.

Declaration

public override int GetNextScrollLineIndex(int index)

Parameters

Type	Name	Description
System.Int32	index	The index.

Returns

Type
System.Int32

Overrides

ScrollAxisBase.GetNextScrollLineIndex(Int32)

GetPreviousScrollLineIndex(Int32)

Gets the index of the previous scroll line.

Declaration

public override int GetPreviousScrollLineIndex(int index)

Parameters

Type	Name	Description
System.Int32	index	The index.

Returns

Type
System.Int32

Overrides

ScrollAxisBase.GetPreviousScrollLineIndex(Int32)

GetScrollLineIndex(out Int32, out Double)

Gets the index of the scroll line.

Declaration

public override void GetScrollLineIndex(out int scrollLindeIndex, out double scrollLineDelta)

Parameters

Type	Name	Description
System.Int32	scrollLindeIndex	Index of the scroll linde.
System.Double	scrollLineDelta	The scroll line delta.

Overrides

ScrollAxisBase.GetScrollLineIndex(out Int32, out Double)

MouseWheel(Int32)

This method is called in response to a MouseWheel event.

Declaration

public override void MouseWheel(int delta)

Parameters

Type	Name	Description
System.Int32	delta	The delta.

Overrides

ScrollAxisBase.MouseWheel(Int32)

RangeToPoints(ScrollAxisRegion, Int32, Int32, Boolean)

Returns the first and last point for the given lines in a region.

Declaration

public override DoubleSpan RangeToPoints(ScrollAxisRegion region, int first, int last, bool allowEstimatesForOutOfViewLines)

Parameters

Type	Name	Description
ScrollAxisRegion	region	The region.
System.Int32	first	The index of the first line.
System.Int32	last	The index of the last line.
System.Boolean	allowEstimatesForOutOfViewLines	if set to true allow estimates for out of view lines.

Returns

Type
DoubleSpan

Overrides

ScrollAxisBase.RangeToPoints(ScrollAxisRegion, Int32, Int32, Boolean)

RangeToRegionPoints(Int32, Int32, Boolean)

Returns an array with 3 ranges indicating the first and last point for the given lines in each region.

Declaration

public override DoubleSpan[] RangeToRegionPoints(int first, int last, bool allowEstimatesForOutOfViewLines)

Parameters

Type	Name	Description
System.Int32	first	The index of the first line.
System.Int32	last	The index of the last line.
System.Boolean	allowEstimatesForOutOfViewLines	if set to true allow estimates for out of view lines.

Returns

Type
DoubleSpan[]

Overrides

ScrollAxisBase.RangeToRegionPoints(Int32, Int32, Boolean)

ScrollToNextLine()

Scrolls to next line.

Declaration

public override void ScrollToNextLine()

Overrides

ScrollAxisBase.ScrollToNextLine()

ScrollToNextPage()

Scrolls to next page.

Declaration

public override void ScrollToNextPage()

Overrides

ScrollAxisBase.ScrollToNextPage()

ScrollToPreviousLine()

Scrolls to previous line.

Declaration

public override void ScrollToPreviousLine()

Overrides

ScrollAxisBase.ScrollToPreviousLine()

ScrollToPreviousPage()

Scrolls to previous page.

Declaration

public override void ScrollToPreviousPage()

Overrides

ScrollAxisBase.ScrollToPreviousPage()

SetFooterLineCount(Int32)

Sets the footer line count.

Declaration

protected override void SetFooterLineCount(int value)

Parameters

Type	Name	Description
System.Int32	value	The value.

Overrides

ScrollAxisBase.SetFooterLineCount(Int32)

SetHeaderLineCount(Int32)

Sets the header line count.

Declaration

protected override void SetHeaderLineCount(int value)

Parameters

Type	Name	Description
System.Int32	value	The value.

Overrides

ScrollAxisBase.SetHeaderLineCount(Int32)

SetLineHiddenState(Int32, Int32, Boolean)

Sets the hidden state of the lines.

Declaration

public override void SetLineHiddenState(int from, int to, bool hide)

Parameters

Type	Name	Description
System.Int32	from	From.
System.Int32	to	To.
System.Boolean	hide	if set to true [hide].

Overrides

ScrollAxisBase.SetLineHiddenState(Int32, Int32, Boolean)

SetLineSize(Int32, Int32, Double)

Sets the size of the lines.

Declaration

public override void SetLineSize(int from, int to, double size)

Parameters

Type	Name	Description
System.Int32	from	From.
System.Int32	to	To.
System.Double	size	The size.

Overrides

ScrollAxisBase.SetLineSize(Int32, Int32, Double)

SetScrollLineIndex(Int32, Double)

Sets the index of the scroll line.

Declaration

public override void SetScrollLineIndex(int scrollLindeIndex, double scrollLineDelta)

Parameters

Type	Name	Description
System.Int32	scrollLindeIndex	Index of the scroll linde.
System.Double	scrollLineDelta	The scroll line delta.

Overrides

ScrollAxisBase.SetScrollLineIndex(Int32, Double)

UpdateScrollBar()

Initialize scrollbar properties from header and footer size and total size of lines in body.

Declaration

public override void UpdateScrollBar()

Overrides

ScrollAxisBase.UpdateScrollBar()

Implements

System.IDisposable