/// <summary>Finds the index of the nearest character to x pixels.</summary>
/// <param name="x">The number of pixels from the left edge of this text element.</param>
/// <returns>The index of the nearest letter.</returns>
public int LetterIndex(int x)
{
if (ChildNodes == null)
{
return(0);
}
int widthSoFar = 0;
int lettersSoFar = 0;
for (int i = 0; i < ChildNodes.Count; i++)
{
WordElement word = (WordElement)ChildNodes[i];
// Grab the words computed style:
Css.ComputedStyle wordStyle = word.Style.Computed;
// Bump up the current width:
widthSoFar += wordStyle.PixelWidth;
if (x <= widthSoFar)
{
int localWidthOffset = x - (widthSoFar - wordStyle.PixelWidth);
lettersSoFar += wordStyle.Text.LetterIndex(localWidthOffset);
break;
}
else
{
lettersSoFar += word.LetterCount();
}
}
return(lettersSoFar);
}
/// <summary>Gets the word containing the letter at the given index.</summary>
/// <param name="index">The index of the letter to find in this text element.</param>
/// <param name="localOffset">The index of the letter in the word.</param>
/// <returns>The nearest word element found.</returns>
public WordElement GetWordWithLetter(int index, out int localOffset)
{
localOffset = 0;
if (ChildNodes == null)
{
return(null);
}
int lettersSoFar = 0;
for (int i = 0; i < ChildNodes.Count; i++)
{
WordElement word = (WordElement)ChildNodes[i];
int letterCount = word.LetterCount();
lettersSoFar += letterCount;
if (index <= lettersSoFar)
{
localOffset = index - (lettersSoFar - letterCount);
return(word);
}
}
localOffset = lettersSoFar;
return(null);
}
/// <summary>Finds the index of the nearest character to x pixels.</summary>
/// <param name="x">The number of pixels from the left edge of this text element.</param>
/// <param name="y">The number of pixels from the top edge of this text element.</param>
/// <returns>The index of the nearest letter.</returns>
public int LetterIndex(int x, int y)
{
if (ChildNodes == null)
{
return(0);
}
int widthSoFar = 0;
int lettersSoFar = 0;
for (int i = 0; i < ChildNodes.Count; i++)
{
WordElement word = (WordElement)ChildNodes[i];
// Grab the words computed style:
Css.ComputedStyle wordStyle = word.Style.Computed;
// Find where the bottom of the line is at:
int lineBottom = wordStyle.PixelHeight + wordStyle.ParentOffsetTop;
if (lineBottom < y)
{
// Not at the right line yet.
lettersSoFar += word.LetterCount();
continue;
}
// Crank over the width:
widthSoFar += wordStyle.PixelWidth;
if (x <= widthSoFar)
{
int localWidthOffset = x - (widthSoFar - wordStyle.PixelWidth);
lettersSoFar += wordStyle.Text.LetterIndex(localWidthOffset);
break;
}
else
{
lettersSoFar += word.LetterCount();
}
}
return(lettersSoFar);
}
