public RtfControlContentRange GetNextRange(float deltaHeight, string rtf)
{
var newInfo = new RtfContentInfo(rtf, Info.Area, Info.TotalSize);
var newContent = new RtfControlContentRange(_owner, newInfo);
newContent.StartVertRange += deltaHeight;
newContent.EndVertRange += deltaHeight;
return(newContent);
}
public LayoutResult Measure(LayoutContext ctx)
{
var content = ctx.ContentRange as RtfControlContentRange;
if (_computedSize.Width == 0)
{
_computedSize.Width = ctx.AvailableSize.Width;
}
if (_computedSize.Height == 0)
{
_computedSize.Height = ctx.AvailableSize.Height;
}
if (ctx.VerticalLayout)
{
if (content == null)
{
var fitHeight = Math.Min(ctx.AvailableSize.Height, _computedSize.Height);
var range = new Range(0, fitHeight, 0, -1);
var rtf = GetNextRtf(range.Bottom);
var info = new RtfContentInfo(rtf, range, _computedSize);
content = new RtfControlContentRange(_control, info);
_computedSize.Height = fitHeight;
}
else
{
var restHeight = content.Info.TotalSize.Height - content.EndVertRange;
var fitHeight = Math.Min(ctx.AvailableSize.Height, restHeight);
var rtf = GetNextRtf(content.EndVertRange + fitHeight);
content = content.GetNextRange(fitHeight, rtf);
_computedSize.Height = fitHeight;
}
_status |= LayoutStatus.ContinueVertically | LayoutStatus.SomeContent;
if (content.isLastPage)
{
return(new LayoutResult(content, LayoutStatus.SomeContent | LayoutStatus.Complete, _computedSize));
}
}
return(new LayoutResult(content, _status, _computedSize));
}