Class VisualContainer

A scrollable visual container that holds the item elements. Handles the arrange and measure logics of all elements.

Inheritance

System.Object

VisualContainer

Implements

System.IDisposable

Namespace: Syncfusion.ListView.XForms

Assembly: Syncfusion.SfListView.XForms.dll

Syntax

public class VisualContainer : Layout<View>, IDisposable

Constructors

VisualContainer()

Initializes a new instance of the VisualContainer class.

Declaration

public VisualContainer()

Properties

ScrollRows

Gets a reference to the ScrollAxisBase instance which contains the information of row lines.

Declaration

public ScrollAxisBase ScrollRows { get; }

Property Value

Type
ScrollAxisBase

Methods

CreateScrollAxis(Boolean, IScrollBar, ILineSizeHost)

Creates a new instance of ScrollAxisBase.

Declaration

protected virtual ScrollAxisBase CreateScrollAxis(bool pixelScroll, IScrollBar scrollBar, ILineSizeHost lineSizes)

Parameters

Type	Name	Description
System.Boolean	pixelScroll	A boolean value denoting pixel or line scrolling.
IScrollBar	scrollBar	The scroll bar.
ILineSizeHost	lineSizes	The line sizes.

Returns

Type	Description
ScrollAxisBase	Returns the ScrollAxisBase.

Dispose()

Disposes all allocated resources.

Declaration

public void Dispose()

Dispose(Boolean)

Dispose the instances, if parameter is true.

Declaration

protected virtual void Dispose(bool disposing)

Parameters

Type	Name	Description
System.Boolean	disposing	Represents the boolean value for disposing objects.

LayoutChildren(Double, Double, Double, Double)

Positions and sizes the children of VisualContainer.

Declaration

protected override void LayoutChildren(double x, double y, double width, double height)

Parameters

Type	Name	Description
System.Double	x	A value that represents the x coordinate of the child.
System.Double	y	A value that represents the y coordinate of the child.
System.Double	width	A value that represents the width of the child.
System.Double	height	A value that represents the height of the child.

OnMeasure(Double, Double)

Gets the desired size of an element.

Declaration

protected override SizeRequest OnMeasure(double widthConstraint, double heightConstraint)

Parameters

Type	Name	Description
System.Double	widthConstraint	The available width for the element to use.
System.Double	heightConstraint	The available height for the element to use.

Returns

Type	Description
Xamarin.Forms.SizeRequest	A Xamarin.Forms.SizeRequest which contains the desired size of the element.

OnSizeAllocated(Double, Double)

Allocates the size of item elements.

Declaration

protected override void OnSizeAllocated(double width, double height)

Parameters

Type	Name	Description
System.Double	width	The new width of the element.
System.Double	height	The new height of the element.

ShouldInvalidateOnChildAdded(View)

Method to decide whether to call Xamarin.Forms.VisualElement.InvalidateMeasure when adding a child or not.

Declaration

protected override bool ShouldInvalidateOnChildAdded(View child)

Parameters

Type	Name	Description
Xamarin.Forms.View	child	The content of the VisualContainer.

Returns

Type	Description
System.Boolean	A boolean value do decide whether to invalidate when adding a child.

ShouldInvalidateOnChildRemoved(View)

Method to decide whether to call Xamarin.Forms.VisualElement.InvalidateMeasure when removing a child or not.

Declaration

protected override bool ShouldInvalidateOnChildRemoved(View child)

Parameters

Type	Name	Description
Xamarin.Forms.View	child	The content of the VisualContainer.

Returns

Type	Description
System.Boolean	A boolean value do decide whether to invalidate when removing a child.

Implements

System.IDisposable