Class FakeItemsPanel

An abstract base class that provides functionality for virtualizing items which have vertical orientation.

Inheritance

System.Object

FakeItemsPanel

TreeViewAdvItemsPanel

Namespace: Syncfusion.Windows.Tools.Controls

Assembly: Syncfusion.Tools.Wpf.dll

Syntax

public abstract class FakeItemsPanel : VirtualizingPanel

Remarks

An abstract base class that provides functionality for virtualizing items which have vertical orientation and shows fake items.

Constructors

FakeItemsPanel()

Default constructor.

Declaration

public FakeItemsPanel()

Fields

c_scrollOffset

Default ScrollOffset

Declaration

protected const int c_scrollOffset = 20

Field Value

Type
System.Int32

Methods

AddFakeItems(IList)

Adds fake items.

Declaration

public void AddFakeItems(IList list)

Parameters

Type	Name	Description
System.Collections.IList	list	Fake items.

AddFakeItems(Object)

Adds fake item.

Declaration

public void AddFakeItems(object element)

Parameters

Type	Name	Description
System.Object	element	Fake item.

ArrangeOverride(Size)

When overridden in a derived class, positions child elements and determines a size for a FrameworkElement derived class.

Declaration

protected override Size ArrangeOverride(Size finalSize)

Parameters

Type	Name	Description
System.Windows.Size	finalSize	The final area within the parent that this element should use to arrange itself and its children.

Returns

Type	Description
System.Windows.Size	The actual size used.

CleanItems()

Revirtualize items that are no longer visible.

Declaration

protected virtual void CleanItems()

ClearAllItems()

Revirtualize all items.

Declaration

protected void ClearAllItems()

Dispose()

Declaration

public void Dispose()

GetArrangeItemSize(UIElement)

Gets size of the item for ArrangeOverride method.

Declaration

protected virtual Size GetArrangeItemSize(UIElement element)

Parameters

Type	Name	Description
System.Windows.UIElement	element

Returns

Type
System.Windows.Size

GetAvailableHeight(Size)

Gets available height.

Declaration

protected virtual double GetAvailableHeight(Size availableSize)

Parameters

Type	Name	Description
System.Windows.Size	availableSize

Returns

Type
System.Double

GetAvailableWidth()

Gets available width.

Declaration

protected virtual double GetAvailableWidth()

Returns

Type
System.Double

GetCashedMeasureSize(Object)

Gets measured size of the items from hashtable.

Declaration

protected Size GetCashedMeasureSize(object key)

Parameters

Type	Name	Description
System.Object	key

Returns

Type
System.Windows.Size

GetComplateUnvisibleItemSize(Int32)

Gets appreciate complete size for unvisible item.

Declaration

protected virtual Size GetComplateUnvisibleItemSize(int index)

Parameters

Type	Name	Description
System.Int32	index

Returns

Type
System.Windows.Size

GetCompleteItemSize(Int32)

Gets appreciate complete size for item.

Declaration

protected virtual Size GetCompleteItemSize(int index)

Parameters

Type	Name	Description
System.Int32	index

Returns

Type
System.Windows.Size

GetCompletePanelSize(Size)

Gets appreciate complete size of the this panel.

Declaration

protected virtual Size GetCompletePanelSize(Size availableSize)

Parameters

Type	Name	Description
System.Windows.Size	availableSize

Returns

Type
System.Windows.Size

GetContainerForFakeElement(Object)

Gets container for fake element.

Declaration

protected virtual UIElement GetContainerForFakeElement(object element)

Parameters

Type	Name	Description
System.Object	element

Returns

Type
System.Windows.UIElement

GetFakeElementType()

Gets type of the fake element.

Declaration

protected virtual Type GetFakeElementType()

Returns

Type
System.Type

GetIndexNoFakeItems(UIElement)

Gets index first no faks element.

Declaration

public int GetIndexNoFakeItems(UIElement element)

Parameters

Type	Name	Description
System.Windows.UIElement	element	The element whose index position is required.

Returns

Type
System.Int32

GetItem(Int32)

Gets item from owner items control by index.

Declaration

protected virtual UIElement GetItem(int index)

Parameters

Type	Name	Description
System.Int32	index

Returns

Type
System.Windows.UIElement

GetKey(Int32)

Gets key for hashtable.

Declaration

protected object GetKey(int index)

Parameters

Type	Name	Description
System.Int32	index

Returns

Type
System.Object

GetMeasureItemSize(UIElement)

Gets size of the item for MeasureOverride method.

Declaration

protected virtual Size GetMeasureItemSize(UIElement element)

Parameters

Type	Name	Description
System.Windows.UIElement	element

Returns

Type
System.Windows.Size

GetOccupyHeight()

Gets occupy height of the ScrollViewer.

Declaration

protected virtual double GetOccupyHeight()

Returns

Type
System.Double

GetPanelSize()

Gets size of the this panel.

Declaration

protected virtual Size GetPanelSize()

Returns

Type
System.Windows.Size

GetTopOffset()

Gets top vertical offset.

Declaration

protected virtual double GetTopOffset()

Returns

Type
System.Double

HideFakeItems()

Hide fake items.

Declaration

public virtual void HideFakeItems()

IsNeedCreateContainer(Object)

Gets value indicating whether need creates new container.

Declaration

protected bool IsNeedCreateContainer(object element)

Parameters

Type	Name	Description
System.Object	element

Returns

Type
System.Boolean

MeasureOverride(Size)

When overridden in a derived class, measures the size in layout required for child elements and determines a size for the FrameworkElement-derived class.

Declaration

protected override Size MeasureOverride(Size availableSize)

Parameters

Type	Name	Description
System.Windows.Size	availableSize	The available size that this element can give to child elements. Infinity can be specified as a value to indicate that the element will size to whatever content is available.

Returns

Type	Description
System.Windows.Size	The size that this element determines it needs during layout, based on its calculations of child element sizes.

OnFakeItemsChanged(UIElement)

Called when the FakeItems collection is changed.

Declaration

protected virtual void OnFakeItemsChanged(UIElement element)

Parameters

Type	Name	Description
System.Windows.UIElement	element

OnInitialized(EventArgs)

Raises the Initialized event. This method is invoked whenever IsInitialized is set to true internally.

Declaration

protected override void OnInitialized(EventArgs e)

Parameters

Type	Name	Description
System.EventArgs	e	The RoutedEventArgs that contains the event data.

RemoveFakeItems()

Removes all fake items.

Declaration

public static void RemoveFakeItems()

SetCashedMeasureSize(Object, Size)

Sets measured size of the items to hashtable.

Declaration

protected void SetCashedMeasureSize(object key, Size value)

Parameters

Type	Name	Description
System.Object	key
System.Windows.Size	value

ShowFakeItems(UIElement, Boolean)

Shows fake items.

Declaration

public virtual void ShowFakeItems(UIElement element, bool bIsTop)

Parameters

Type	Name	Description
System.Windows.UIElement	element
System.Boolean	bIsTop	Indicates whether fake items will show over element; otherwise fake items will show under element.

UpdateVisibilityIndex(Size)

Update visible item index.

Declaration

protected virtual void UpdateVisibilityIndex(Size availableSize)

Parameters

Type	Name	Description
System.Windows.Size	availableSize