/// <summary>
/// Refresh the adornments of the view based on line
/// information from a view layout changed event.
/// </summary>
/// <typeparam name="TLine">The type representing lines in the view.</typeparam>
/// <param name="adornmentView">The view to refresh adornments in.</param>
/// <param name="changedLines">
/// The lines that have changed according to a view layout changed
/// event.</param>
internal static void RefreshAdornments <TLine>(IAdornedTextView <TLine> adornmentView, IReadOnlyList <TLine> changedLines) where TLine : class
{
// VS2013 and VS2015 Preview under certain circumstances leave
// out the first line in runs of lines affected by changes.
//
// For example when pressing enter on an empty line it removes
// the adornment of the empty line, but only sends the newly
// created line below in e.NewOrReformattedLines.
//
// A single call to OnLayoutChanged can contain multiple runs
// of affected lines, and each run may be missing a first line
// which have been stripped of its previous adornments.
foreach (var line in changedLines)
{
adornmentView.AddAdornmentToLine(line);
}
var uncertainLinesAbove = changedLines.Select(line => ListItems.PreviousItemOrDefault(adornmentView.Lines, line)).Except(changedLines).Where(line => line != null);
foreach (var line in uncertainLinesAbove)
{
adornmentView.ClearAdornmentsFromLine(line);
adornmentView.AddAdornmentToLine(line);
}
}
private static void AssertAllLinesHaveSingleAdornment(IAdornedTextView <ViewLineStub> adornedTextView)
{
Action <ViewLineStub> lineMustHaveOneAdornment =
line => Assert.Equal(1, line.AdornmentCount);
Assert.Collection(adornedTextView.Lines,
Enumerable.Repeat(lineMustHaveOneAdornment, 10).ToArray());
}
