/// <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);
}
/// <summary>Gets the relative position in pixels of the letter at the given index.</summary>
/// <param name="index">The index of the letter in this text element.</param>
/// <returns>The number of pixels from the left and top edges of this text element the letter is as a vector.</returns>
public Vector2 GetPosition(ref int index)
{
if (index == 0 || ChildNodes == null)
{
return(Vector2.zero);
}
int localOffset;
WordElement word = GetWordWithLetter(index, out localOffset);
if (word == null)
{
index -= localOffset;
return(Vector2.zero);
}
Css.ComputedStyle computed = word.Style.Computed;
float left = computed.ParentOffsetLeft + computed.Text.LocalPositionOf(localOffset);
float top = computed.ParentOffsetTop;
return(new Vector2(left, top));
}
internal void Lettering(List <Element> into, Element parent)
{
if (ChildNodes == null)
{
return;
}
int count = ChildNodes.Count;
for (int i = 0; i < count; i++)
{
// Grab the child node:
Element child = ChildNodes[i];
// Get the element type:
Type type = child.GetType();
if (type == typeof(TextElement))
{
// Apply to each word:
child.Lettering(into, parent);
}
else if (type == typeof(WordElement))
{
// Split the word into its chars:
WordElement word = (WordElement)child;
// Grab the text object:
TextRenderingProperty textProperty = word.Style.Computed.Text;
if (textProperty == null || textProperty.Text == null)
{
continue;
}
// Get the characters:
char[] characters = textProperty.Text.ToCharArray();
// How many chars?
int characterCount = characters.Length;
// Add each letter as a new element:
for (int c = 0; c < characterCount; c++)
{
// The character(s) as a string:
string charString;
// Grab the character:
char character = characters[c];
// Surrogate pair?
if (char.IsHighSurrogate(character) && c != characters.Length - 1)
{
// Low surrogate follows:
char lowChar = characters[c + 1];
c++;
// Get the charcode:
int code = char.ConvertToUtf32(character, lowChar);
// Turn it back into a string:
charString = char.ConvertFromUtf32(code);
}
else
{
charString = "" + character;
}
// Create a word ele:
WordElement result = new WordElement(Document, parent, charString);
// Add it:
into.Add(result);
}
}
else
{
// Direct add:
into.Add(child);
}
}
}
internal void Lettering(List<Element> into,Element parent){
if(ChildNodes==null){
return;
}
int count=ChildNodes.Count;
for(int i=0;i<count;i++){
// Grab the child node:
Element child=ChildNodes[i];
// Get the element type:
Type type=child.GetType();
if(type == typeof(TextElement)){
// Apply to each word:
child.Lettering(into,parent);
}else if(type == typeof(WordElement)){
// Split the word into its chars:
WordElement word=(WordElement)child;
// Grab the text object:
TextRenderingProperty textProperty=word.Style.Computed.Text;
if(textProperty==null || textProperty.Text==null){
continue;
}
// Get the characters:
char[] characters=textProperty.Text.ToCharArray();
// How many chars?
int characterCount=characters.Length;
// Add each letter as a new element:
for(int c=0;c<characterCount;c++){
// The character(s) as a string:
string charString;
// Grab the character:
char character=characters[c];
// Surrogate pair?
if(char.IsHighSurrogate(character) && c!=characters.Length-1){
// Low surrogate follows:
char lowChar=characters[c+1];
c++;
// Get the charcode:
int code=char.ConvertToUtf32(character,lowChar);
// Turn it back into a string:
charString=char.ConvertFromUtf32(code);
}else{
charString=""+character;
}
// Create a word ele:
WordElement result=new WordElement(Document,parent,charString);
// Add it:
into.Add(result);
}
}else{
// Direct add:
into.Add(child);
}
}
}
