public ScrollPositionWithSingleContext(
ScrollPhysics physics = null,
ScrollContext context = null,
float?initialPixels = 0.0f,
bool keepScrollOffset = true,
ScrollPosition oldPosition = null,
string debugLabel = null
) : base(
physics: physics,
context: context,
keepScrollOffset: keepScrollOffset,
oldPosition: oldPosition,
debugLabel: debugLabel
)
{
if (this._pixels == null && initialPixels != null)
{
this.correctPixels(initialPixels.Value);
}
if (this.activity == null)
{
this.goIdle();
}
D.assert(this.activity != null);
}
protected ScrollPosition(
ScrollPhysics physics = null,
ScrollContext context = null,
bool keepScrollOffset = true,
ScrollPosition oldPosition = null,
string debugLabel = null
)
{
D.assert(physics != null);
D.assert(context != null);
D.assert(context.vsync != null);
this.physics = physics;
this.context = context;
this.keepScrollOffset = keepScrollOffset;
this.debugLabel = debugLabel;
if (oldPosition != null)
{
this.absorb(oldPosition);
}
if (keepScrollOffset)
{
this.restoreScrollOffset();
}
}
public override ScrollPosition createScrollPosition(ScrollPhysics physics, ScrollContext context,
ScrollPosition oldPosition)
{
return(new _FixedExtentScrollPosition(
physics: physics,
context: context,
initialItem: this.initialItem,
oldPosition: oldPosition
));
}
public override ScrollPosition createScrollPosition(ScrollPhysics physics, ScrollContext context,
ScrollPosition oldPosition)
{
return(new _TabBarScrollPosition(
physics: physics,
context: context,
oldPosition: oldPosition,
tabBar: this.tabBar
));
}
public override ScrollPosition createScrollPosition(ScrollPhysics physics, ScrollContext context,
ScrollPosition oldPosition)
{
return(new _PagePosition(
physics: physics,
context: context,
initialPage: this.initialPage,
keepPage: this.keepPage,
viewportFraction: this.viewportFraction,
oldPosition: oldPosition
));
}
public override ScrollPosition createScrollPosition(
ScrollPhysics physics,
ScrollContext context,
ScrollPosition oldPosition
)
{
return(new _DraggableScrollableSheetScrollPosition(
physics: physics,
context: context,
oldPosition: oldPosition,
extent: extent
));
}
public _TabBarScrollPosition(
ScrollPhysics physics = null,
ScrollContext context = null,
ScrollPosition oldPosition = null,
_TabBarState tabBar = null
) : base(
physics: physics,
context: context,
initialPixels: null,
oldPosition: oldPosition)
{
this.tabBar = tabBar;
}
public TestScrollPositionWithSingleContext(
ScrollPhysics physics = null,
ScrollContext context = null,
float?initialPixels = 0.0f,
bool keepScrollOffset = true,
ScrollPosition oldPosition = null,
string debugLabel = null
) : base(physics: physics,
context: context,
keepScrollOffset: keepScrollOffset,
oldPosition: oldPosition,
debugLabel: debugLabel)
{
}
public virtual ScrollPosition createScrollPosition(
ScrollPhysics physics,
ScrollContext context,
ScrollPosition oldPosition
)
{
return(new ScrollPositionWithSingleContext(
physics: physics,
context: context,
initialPixels: this.initialScrollOffset,
keepScrollOffset: this.keepScrollOffset,
oldPosition: oldPosition,
debugLabel: this.debugLabel
));
}
public _DraggableScrollableSheetScrollPosition(
ScrollPhysics physics = null,
ScrollContext context = null,
float initialPixels = 0.0f,
bool keepScrollOffset = true,
ScrollPosition oldPosition = null,
string debugLabel = null,
_DraggableSheetExtent extent = null
) : base(physics: physics,
context: context,
initialPixels: initialPixels,
keepScrollOffset: keepScrollOffset,
oldPosition: oldPosition,
debugLabel: debugLabel)
{
D.assert(extent != null);
this.extent = extent;
}
internal _PagePosition(
ScrollPhysics physics = null,
ScrollContext context = null,
int initialPage = 0,
bool keepPage = true,
float viewportFraction = 1.0f,
ScrollPosition oldPosition = null
) : base(
physics: physics,
context: context,
initialPixels: null,
keepScrollOffset: keepPage,
oldPosition: oldPosition
)
{
D.assert(viewportFraction > 0.0);
this.initialPage = initialPage;
_viewportFraction = viewportFraction;
_pageToUseOnStartup = initialPage;
}
public _FixedExtentScrollPosition(
ScrollPhysics physics,
ScrollContext context,
int initialItem,
bool keepScrollOffset = true,
ScrollPosition oldPosition = null,
string debugLabel = null
) : base(
physics: physics,
context: context,
initialPixels: _getItemExtentFromScrollContext(context) * initialItem,
keepScrollOffset: keepScrollOffset,
oldPosition: oldPosition,
debugLabel: debugLabel
)
{
D.assert(
context is _FixedExtentScrollableState,
() => "FixedExtentScrollController can only be used with ListWheelScrollViews"
);
}
private static Composite CreateUseBestScroll()
{
return(new ThrottlePasses(
TimeSpan.FromMilliseconds(250),
new Sequence(
ctx =>
{
ScrollContext sc = new ScrollContext();
sc.scroll = FindBestScroll();
return sc;
},
new Decorator(
req => req != null && ((ScrollContext)req).scroll != null,
new Action(r => Logger.WriteDebug("UseBestScroll: will attempt to use {0} #{1}", ((ScrollContext)r).scroll.Name, ((ScrollContext)r).scroll.Entry))
),
new Action(r =>
{
ScrollContext sc = (ScrollContext)r;
sc.usedAt = DateTime.UtcNow;
UseItem(sc.scroll);
}),
new WaitContinue(
TimeSpan.FromMilliseconds(250),
until => Utilities.EventHandlers.LastRedErrorMessage > ((ScrollContext)until).usedAt,
new Action(r => {
int suppressFor = 5;
suppressScrollsUntil = DateTime.UtcNow.AddMinutes(suppressFor);
Logger.WriteDebug("UseBestScroll: suppressing Scroll Use for {0} minutes due to WoWRedError encountered", suppressFor);
return RunStatus.Failure;
})
)
)
));
}
static float _getItemExtentFromScrollContext(ScrollContext context)
{
_FixedExtentScrollableState scrollable = (_FixedExtentScrollableState)context;
return(scrollable.itemExtent);
}
