void tilePages()
{
// Calculate which pages are visible
var visibleBounds = pagingScrollView.Bounds;
int firstNeededPageIndex = (int)Math.Floor(visibleBounds.GetMinX() / visibleBounds.Width);
int lastNeededPageIndex = (int)Math.Floor((visibleBounds.GetMaxX()-1) / visibleBounds.Width);
firstNeededPageIndex = Math.Max(firstNeededPageIndex, 0);
lastNeededPageIndex = Math.Min(lastNeededPageIndex, this.imageCount - 1);
// Recycle no-longer-visible pages
foreach (var page in visiblePages)
{
if (page.index < firstNeededPageIndex || page.index > lastNeededPageIndex)
{
recycledPages.Add(page);
page.RemoveFromSuperview();
}
}
// [visiblePages minusSet:recycledPages];
foreach (var item in recycledPages)
{
if (visiblePages.Contains(item))
{
visiblePages.Remove(item);
}
}
// add missing pages
for (int index = firstNeededPageIndex; index <= lastNeededPageIndex; index++)
{
if (!this.isDisplayingPageForIndex(index))
{
ImageScrollView page = this.dequeueRecycledPage();
if (page == null)
{
page = new ImageScrollView(frameForPageAtIndex(index)); // different from ObjC [CD]
}
this.configurePage (page, index);
pagingScrollView.AddSubview (page);
visiblePages.Add(page);
}
}
}
void configurePage(ImageScrollView page, int index)
{
page.index = index;
page.Frame = this.frameForPageAtIndex (index);
if (useTiledImage)
{
// Use tiled images
page.displayTiledImageNamed (this.imageNameAtIndex (index), this.imageSizeAtIndex(index));
}
else
{
// To use full images instead of tiled images, replace the "displayTiledImageNamed:" call
// above by the following line:
page.displayImage (this.imageAtIndex (index));
}
}