/// <summary>
/// Initializes a new instance of the <see cref="LineInfoResult"/> class.
/// </summary>
/// <param name="value">The value being examined.</param>
public LineInfoResult(LineInfo value)
{
this.value = value;
}
protected static LineInfoResult TheResultingValue(LineInfo obj)
{
return new LineInfoResult(obj);
}
/// <summary>
/// Gets a <see cref="LineInfo"/> structure which describes the line that comes immediately
/// after the specified line.
/// </summary>
/// <param name="previous">A <see cref="LineInfo"/> structure which describes the previous line.</param>
/// <param name="next">A <see cref="LineInfo"/> structure which describes the line that comes after <paramref name="previous"/>.</param>
/// <returns><see langword="true"/> if a line was retrieved; otherwise, <see langword="false"/>.</returns>
public Boolean GetNextLineInfo(LineInfo previous, out LineInfo next)
{
return(GetNextLineInfoRef(ref previous, out next));
}
/// <summary>
/// Gets a <see cref="LineInfo"/> structure which describes the line that comes immediately
/// after the specified line.
/// </summary>
/// <param name="previous">A <see cref="LineInfo"/> structure which describes the previous line.</param>
/// <param name="next">A <see cref="LineInfo"/> structure which describes the line that comes after <paramref name="previous"/>.</param>
/// <returns><see langword="true"/> if a line was retrieved; otherwise, <see langword="false"/>.</returns>
public Boolean GetNextLineInfoRef(ref LineInfo previous, out LineInfo next)
{
if (previous.Source != this)
throw new ArgumentException(UltravioletStrings.LineInfoIsNotFromSameSource);
if (previous.LineIndex + 1 == LineCount)
{
next = default(LineInfo);
return false;
}
var acquiredPointers = !HasAcquiredPointers;
if (acquiredPointers)
AcquirePointers();
if (StreamPositionInObjects != previous.OffsetInCommands)
Seek(previous.OffsetInCommands);
Seek(1 + StreamPositionInObjects + ((TextLayoutLineInfoCommand*)Data)->LengthInCommands);
var lineInfo = (TextLayoutLineInfoCommand*)Data;
next = new LineInfo(this, previous.LineIndex + 1, StreamPositionInObjects, previous.OffsetInGlyphs + previous.LengthInGlyphs,
lineInfo->Offset, previous.Y + previous.Height, lineInfo->LineWidth,
lineInfo->LineHeight, lineInfo->LengthInCommands, lineInfo->LengthInGlyphs);
if (acquiredPointers)
ReleasePointers();
return true;
}
/// <summary>
/// Gets a <see cref="LineInfo"/> structure which describes the line that comes immediately
/// after the specified line.
/// </summary>
/// <param name="previous">A <see cref="LineInfo"/> structure which describes the previous line.</param>
/// <param name="next">A <see cref="LineInfo"/> structure which describes the line that comes after <paramref name="previous"/>.</param>
/// <returns><see langword="true"/> if a line was retrieved; otherwise, <see langword="false"/>.</returns>
public Boolean GetNextLineInfo(LineInfo previous, out LineInfo next)
{
return GetNextLineInfoRef(ref previous, out next);
}
/// <summary>
/// Gets a <see cref="LineInfo"/> structure which describes the specified line of formatted text.
/// </summary>
/// <param name="index">The index of the line for which to retrieve metadata.</param>
/// <returns>A <see cref="LineInfo"/> structure which describes the specified line of formatted text.</returns>
public LineInfo GetLineInfo(Int32 index)
{
Contract.EnsureRange(index >= 0 && index < LineCount, nameof(index));
var acquiredPointers = !HasAcquiredPointers;
if (acquiredPointers)
AcquirePointers();
Seek(0);
var blockOffset = ((TextLayoutBlockInfoCommand*)Data)->Offset;
SeekNextCommand();
var lineInfo = (TextLayoutLineInfoCommand*)Data;
var linePosition = 0;
var lineGlyphStart = 0;
for (int i = 0; i < index; i++)
{
linePosition += lineInfo->LineHeight;
lineGlyphStart += lineInfo->LengthInGlyphs;
Seek(1 + StreamPositionInObjects + lineInfo->LengthInCommands);
lineInfo = (TextLayoutLineInfoCommand*)Data;
}
var result = new LineInfo(this, index, StreamPositionInObjects, lineGlyphStart, lineInfo->Offset, blockOffset + linePosition,
lineInfo->LineWidth, lineInfo->LineHeight, lineInfo->LengthInCommands, lineInfo->LengthInGlyphs);
if (acquiredPointers)
ReleasePointers();
return result;
}