/// <summary>
/// Gets a figure to display the given text section with the given style.
/// </summary>
/// <param name="Line">The index of the line where the text section begins.</param>
/// <param name="Offset">The offset (in cells) of the beginning of the text section from the start of the line.</param>
private static Figure _GetFigure(TextBlockStyle BlockStyle, TextStyle Style, TextSection TextSection, ref int Line, ref int Offset)
{
throw new NotImplementedException();
}
/// <summary>
/// Gets a figure to display the given styled text section (using the unselected style).
/// </summary>
/// <param name="Line">The index of the line where the text section begins.</param>
/// <param name="Offset">The offset (in cells) of the beginning of the text section from the start of the line.</param>
private static Figure _GetFigure(TextBlockStyle BlockStyle, StyledTextSection TextSection, ref int Line, ref int Offset)
{
UniformStyledTextSection usts = TextSection as UniformStyledTextSection;
if (usts != null)
{
return _GetFigure(BlockStyle, usts.NormalStyle, usts.Source, ref Line, ref Offset);
}
ConcatStyledTextSection csts = TextSection as ConcatStyledTextSection;
if (csts != null)
{
return
_GetFigure(BlockStyle, csts.A, ref Line, ref Offset) +
_GetFigure(BlockStyle, csts.B, ref Line, ref Offset);
}
throw new NotImplementedException();
}
/// <summary>
/// Determines the width of an item when placed at the given offset from the left edge of a text block and adds it to
/// the offset.
/// </summary>
private static void _AppendLine(TextBlockStyle Style, TextItem Item, ref int Offset)
{
if (Item is IndentTextItem)
{
Style.Indent(ref Offset);
return;
}
SpaceTextItem sti = Item as SpaceTextItem;
if (sti != null)
{
Offset += sti.Length;
return;
}
if (Item is CharacterTextItem)
{
Offset++;
return;
}
}
/// <summary>
/// Performs initial measurements on a text section to be used in a layout.
/// </summary>
/// <param name="LineIndices">A list to which the indices of line start items should be appened.</param>
/// <param name="Index">The index of the first item in the text section.</param>
/// <param name="Offset">The offset of the start of text section from the beginning of the current line. This will be changed to the
/// offset of the end of the text section from the beginning of the latest line.</param>
/// <param name="Width">The lower bound on the line width needed to contain the text section.</param>
private static void _Measure(TextBlockStyle Style, TextSection Section, int Index, List<int> LineIndices, ref int Offset, ref int Width)
{
TextItem ti = Section as TextItem;
if (ti != null)
{
if (ti == LineStartTextItem.Instance)
{
Offset = 0;
LineIndices.Add(Index);
return;
}
_AppendLine(Style, ti, ref Offset);
Width = Math.Max(Width, Offset);
return;
}
ConcatTextSection cts = Section as ConcatTextSection;
if (cts != null)
{
_Measure(Style, cts.A, Index, LineIndices, ref Offset, ref Width);
_Measure(Style, cts.B, Index + cts.A.Size, LineIndices, ref Offset, ref Width);
}
}
public TextBlock(StyledTextSection Text, TextBlockStyle Style)
{
this.Style = Style;
this._Text = Text;
}
