public static Dictionary <int, EditorCursorCoordinate> GetCoordinates(HTMLTextAreaElement element, Author[] authors)
{
var value = element.Value + "_";
div?.Remove();
div = Document.CreateElement("div");
Document.Body.AppendChild(div);
var style = div.Style;
var computed = Window.GetComputedStyle(element);
style.WhiteSpace = WhiteSpace.PreWrap;
style.WordWrap = "break-word";
style.Position = Position.Absolute;
//style.Visibility = Visibility.Hidden;
foreach (var prop in propeties)
{
style[prop] = computed[prop];
}
var positions = authors.Select(a => a.Position)
.Where(p => p < value.Length)
.Concat(new[] { value.Length, value.Length + 1 })
.OrderBy()
.Distinct()
.ToArray();
div.TextContent = value.Substring(0, positions[0]);
var result = new Dictionary <int, EditorCursorCoordinate>();
var j = 0;
for (var i = 0; i < positions.Length - 1; i++)
{
var span = Document.CreateElement("span");
span.Style.BackgroundColor = colors[j++ % colors.Length];
span.TextContent = value.Substring(positions[i], positions[i + 1]);
div.AppendChild(span);
result[positions[i]] = new EditorCursorCoordinate
{
Top = span.OffsetTop + SafeIntParse(computed.BorderTopWidth),
Left = span.OffsetLeft + SafeIntParse(computed.BorderLeftWidth),
Height = SafeIntParse(computed.LineHeight)
};
}
div.Remove();
div = null;
return(result);
}
public void Change(EditorCursorCoordinate coordinate)
{
this.coordinate = coordinate;
Render();
}
