public PageControlInfo CalculateAtPageIndex(int pageIndex)
{
if (pageIndex < 1 || TotalPageCount == 0)
{
return(PageControlInfo.NewEmptyResult());
}
return(pageIndex > TotalPageCount
? GetResultFrom(TotalPageCount)
: GetResultFrom(pageIndex));
}
public static void SequenceCanonicalControls(this PageControlInfo controlInfo,
Action <int?> onPrevious,
Action onGap,
Action <int, bool> onOrdinal,
Action <int?> onNext)
{
var controlIndexMap = controlInfo.ControlIndexMap;
var centralWindow = controlInfo.SequentialIndexWindow;
var currentPageIndex = controlInfo.CurrentPageIndex;
onPrevious(controlIndexMap.Previous != default(int) ? (int?)controlIndexMap.Previous : null);
if (controlInfo.FirstIndexIsOutsideWindow)
{
onOrdinal(1, false);
}
var leftGapSize = controlInfo.WindowLeftGapSize;
if (leftGapSize == 2)
{
onOrdinal(2, false);
}
else if (leftGapSize > 2)
{
onGap();
}
foreach (var index in centralWindow)
{
onOrdinal(index, index == currentPageIndex);
}
var rightGapSize = controlInfo.WindowRightGapSize;
if (rightGapSize > 2)
{
onGap();
}
else if (rightGapSize == 2)
{
var index = controlIndexMap.Last - 1;
onOrdinal(index, false);
}
if (controlInfo.LastIndexIsOutsideWindow)
{
onOrdinal(controlIndexMap.Last, false);
}
onNext(controlIndexMap.Next != default(int) ? (int?)controlIndexMap.Next : null);
}
private RenderedNavigationInfo RenderControls(PageControlInfo controlInfo)
{
if (controlInfo.ItemRange.TotalItemCount == 0)
{
return(new RenderedNavigationInfo("", controlInfo.ItemRange, controlInfo.TotalPageCount));
}
var builder = new StringBuilder();
controlInfo.SequenceCanonicalControls(index => builder.Append(_selector.RenderPreviousControl(index)),
() => builder.Append(_selector.RenderGapMarker()),
(index, isSelected) => builder.Append(_selector.RenderOrdinalControl(index, isSelected)),
index => builder.Append(_selector.RenderNextControl(index)));
var result = new RenderedNavigationInfo(builder.ToString(), controlInfo.ItemRange, _calculator.TotalPageCount);
return(result);
}
