UiScrollBoxInterface Class Reference

Inherits AZ::ComponentBus.

Public Types
enum class	SnapMode { None , Children , Grid }
enum class	ScrollBarVisibility { AlwaysShow , AutoHide , AutoHideAndResizeViewport }
typedef AZStd::function< void(AZ::EntityId sendingEntityId, AZ::Vector2 newScrollOffset)>	ScrollOffsetChangeCallback
	Callback for when box is scrolled.

Public Member Functions
virtual AZ::Vector2	GetScrollOffset ()=0
virtual void	SetScrollOffset (AZ::Vector2 scrollOffset)=0
virtual AZ::Vector2	GetNormalizedScrollValue ()=0
	Get the scroll value from 0 - 1.
virtual void	ChangeContentSizeAndScrollOffset (AZ::Vector2 contentSize, AZ::Vector2 scrollOffset)=0
	Change content size and scroll offset, and handle the changes.
virtual bool	HasHorizontalContentToScroll ()=0
	Get whether there is content to scroll horizontally.
virtual bool	HasVerticalContentToScroll ()=0
	Get whether there is content to scroll vertically.
virtual bool	GetIsHorizontalScrollingEnabled ()=0
	Get whether horizontal scrolling interaction is enabled.
virtual void	SetIsHorizontalScrollingEnabled (bool isEnabled)=0
	Set whether horizontal scrolling interaction is enabled.
virtual bool	GetIsVerticalScrollingEnabled ()=0
	Get whether vertical scrolling interaction is enabled.
virtual void	SetIsVerticalScrollingEnabled (bool isEnabled)=0
	Set whether vertical scrolling interaction is enabled.
virtual bool	GetIsScrollingConstrained ()=0
	Get whether scrolling interaction is constrained to the content area.
virtual void	SetIsScrollingConstrained (bool isConstrained)=0
	Set whether vertical scrolling interaction is constrained to the content area.
virtual SnapMode	GetSnapMode ()=0
	Get snap mode.
virtual void	SetSnapMode (SnapMode snapMode)=0
	Set snap mode.
virtual AZ::Vector2	GetSnapGrid ()=0
	Get snap grid.
virtual void	SetSnapGrid (AZ::Vector2 snapGrid)=0
	Set snap grid.
virtual ScrollBarVisibility	GetHorizontalScrollBarVisibility ()=0
	Get horizontal scrollbar visibility behavior.
virtual void	SetHorizontalScrollBarVisibility (ScrollBarVisibility visibility)=0
	Set horizontal scrollbar visibility behavior.
virtual ScrollBarVisibility	GetVerticalScrollBarVisibility ()=0
	Get vertical scrollbar visibility behavior.
virtual void	SetVerticalScrollBarVisibility (ScrollBarVisibility visibility)=0
	Set vertical scrollbar visibility behavior.
virtual ScrollOffsetChangeCallback	GetScrollOffsetChangingCallback ()=0
	Get the callback invoked while the scroll offset is changing.
virtual void	SetScrollOffsetChangingCallback (ScrollOffsetChangeCallback onChange)=0
	Set the callback invoked while the scroll offset is changing.
virtual const LyShine::ActionName &	GetScrollOffsetChangingActionName ()=0
	Get the action triggered while the scroll offset is changing.
virtual void	SetScrollOffsetChangingActionName (const LyShine::ActionName &actionName)=0
	Set the action triggered while the scroll offset is changing.
virtual ScrollOffsetChangeCallback	GetScrollOffsetChangedCallback ()=0
	Get the callback invoked when the scroll offset is done changing.
virtual void	SetScrollOffsetChangedCallback (ScrollOffsetChangeCallback onChange)=0
	Set the callback invoked when the scroll offset is done changing.
virtual const LyShine::ActionName &	GetScrollOffsetChangedActionName ()=0
	Get the action triggered when the scroll offset is done changing.
virtual void	SetScrollOffsetChangedActionName (const LyShine::ActionName &actionName)=0
	Set the action triggered when the scroll offset is done changing.
virtual void	SetContentEntity (AZ::EntityId entityId)=0
	Set the optional content entity, if none is specified then nothing gets scrolled.
virtual AZ::EntityId	GetContentEntity ()=0
	Get the optional content entity.
virtual void	SetHorizontalScrollBarEntity (AZ::EntityId entityId)=0
	Set the optional horizontal scrollbar entity.
virtual AZ::EntityId	GetHorizontalScrollBarEntity ()=0
	Get the optional horizontal scrollbar entity.
virtual void	SetVerticalScrollBarEntity (AZ::EntityId entityId)=0
	Set the optional vertical scrollbar entity.
virtual AZ::EntityId	GetVerticalScrollBarEntity ()=0
	Get the optional vertical scrollbar entity.
virtual AZ::EntityId	FindClosestContentChildElement ()=0

Static Public Attributes
static const AZ::EBusHandlerPolicy	HandlerPolicy = AZ::EBusHandlerPolicy::Single
	Only one component on a entity can implement the events.

Member Function Documentation

FindClosestContentChildElement()

virtual AZ::EntityId UiScrollBoxInterface::FindClosestContentChildElement ( )

pure virtual

Find the child of the content element that is closest to the content anchors at the current scroll offset. i.e. what is the currently "selected" child

GetScrollOffset()

virtual AZ::Vector2 UiScrollBoxInterface::GetScrollOffset ( )

pure virtual

Query the current scroll offset of the scroll box

Returns

The current scroll offset for the scroll box.

The scroll offset is the offset from the content element's anchor point to the content element's pivot. If the content element's anchor points are split it is the offset from their center to the pivot. So if the mouse is dragged left, the content moves to the left, so the offset X has the X drag amount subtracted from it. Using the offset from the anchor to the pivot allows the offset to be center to center or top-left to top-left, or any combination of the possible anchor and pivot positions

SetScrollOffset()

virtual void UiScrollBoxInterface::SetScrollOffset ( AZ::Vector2  scrollOffset )

pure virtual

Set the scroll offset of the scroll box

Parameters

isOn	The new desired scroll offset of the scroll box.

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The documentation for this class was generated from the following file:

• Gems/LyShine/Code/Include/LyShine/Bus/UiScrollBoxBus.h