/// <summary>
/// Конструктор.
/// </summary>
/// <param name="original">Оригинальное состояние.</param>
public ReadonlyTextRenderAttributeState(ITextRenderAttributeState original)
{
var attr = original?.Attributes;
if (attr != null)
{
foreach (var kv in attr)
{
Attributes[kv.Key] = kv.Value;
}
}
}
/// <summary>
/// Выполнить текстовую команду.
/// </summary>
/// <param name="attributes">Атрибуты.</param>
/// <param name="text">Текст.</param>
/// <returns>Остаток текста.</returns>
protected virtual string ExectuteText(ITextRenderAttributeState attributes, string text)
{
var words = Splitter.Split(text);
var run = CheckLengths(attributes, words);
var isAdded = false;
Action old = null;
var sb = new StringBuilder();
foreach (var r in run)
{
if (!r.Item2)
{
bool isThis = false;
if (!isAdded)
{
isAdded = true;
var ta = old;
if (ta != null)
{
ta();
}
else
{
if (FirstInLine)
{
r.Item3?.Invoke();
isThis = true;
}
else
{
NewLine(attributes);
}
}
}
if (!isThis)
{
sb.Append(r.Item1);
}
}
old = r.Item3;
}
if (!isAdded)
{
var ta = old;
ta?.Invoke();
}
return sb.ToString();
}
/// <summary>
/// Установить высоту линии по умолчанию.
/// </summary>
/// <param name="attributes">Атрибуты.</param>
protected virtual void SetDefaultLineHeight(ITextRenderAttributeState attributes)
{
var size = Factory.MeasureCommand(new TextRenderCommand(attributes, new TextRenderTextContent("A")));
if (LineHeight < size.Height)
{
LineHeight = size.Height;
}
}
/// <summary>
/// Начать новую строку.
/// </summary>
/// <param name="attributes">Атрибуты.</param>
protected virtual void NewLine(ITextRenderAttributeState attributes)
{
Lines++;
if (LineHeight < 0.01)
{
SetDefaultLineHeight(attributes);
}
Top = Top + LineHeight;
LineHeight = 0;
LineWidth = 0;
FirstInLine = true;
SynCanvasHeight();
}
protected IEnumerable<Tuple<string, bool, Action, bool>> CheckLengths(ITextRenderAttributeState attributes, IEnumerable<string> words)
{
var wordsArr = words.ToArray();
var testCom = new TextRenderCommand(attributes, new TextRenderTextContent("a"));
var charWidth = GetElementWidth(testCom);
int idx0 = 0;
string current = "";
for (int i = 0; i < wordsArr.Length; i++)
{
var word = wordsArr[i];
current += word;
var len = current.Length * charWidth;
if ((len + LineWidth) > RenderWidth)
{
idx0 = i;
break;
}
}
int idx1 = -1;
for (int j = idx0; j >= 0; j--)
{
current = "";
for (int i = 0; i <= j; i++)
{
var word = wordsArr[i];
current += word;
}
var com = new TextRenderCommand(attributes, new TextRenderTextContent(current));
var elWidth = GetElementWidth(com);
if (!((elWidth + LineWidth) > RenderWidth))
{
idx1 = j;
break;
}
}
bool exceeded = false;
current = "";
for (int i = 0; i < wordsArr.Length; i++)
{
var word = wordsArr[i];
current += word;
if (exceeded)
{
yield return new Tuple<string, bool, Action, bool>(word, false, null, true);
}
else
{
var com = new TextRenderCommand(attributes, new TextRenderTextContent(current));
if (i > idx1)
{
var elWidth = GetElementWidth(com);
if ((elWidth + LineWidth) > RenderWidth)
{
exceeded = true;
}
yield return new Tuple<string, bool, Action, bool>(word, !exceeded, () => AddElementToCanvas(com), false);
}
else
{
yield return new Tuple<string, bool, Action, bool>(word, true, () => AddElementToCanvas(com), false);
}
}
}
}
/// <summary>
/// Конструктор.
/// </summary>
/// <param name="attributes">Атрибуты.</param>
/// <param name="content">Контент.</param>
public TextRenderCommand(ITextRenderAttributeState attributes, ITextRenderContent content)
{
Attributes = attributes;
Content = content;
}
/// <summary>
/// Установить высоту линии по умолчанию.
/// </summary>
/// <param name="attributes">Атрибуты.</param>
protected virtual void SetDefaultLineHeight(ITextRenderAttributeState attributes)
{
var el = Factory.Create(new TextRenderCommand(attributes, new TextRenderTextContent("A")));
if (LineHeight < el.Height)
{
LineHeight = el.Height;
}
}
protected IEnumerable<Tuple<string, bool, Func<FrameworkElement>, bool>> CheckLengths(ITextRenderAttributeState attributes, IEnumerable<string> words)
{
var wordsArr = GetRoughLengths(attributes, words).ToArray();
int idx0 = 0;
string current = "";
double len = 0;
for (int i = 0; i < wordsArr.Length; i++)
{
var word = wordsArr[i];
current += word.Item1;
len = word.Item2;
if ((len + LineWidth) > TextCanvas.ActualWidth)
{
idx0 = i;
break;
}
}
int idx1 = -1;
for (int j = idx0; j >= 0; j--)
{
current = "";
for (int i = 0; i <= j; i++)
{
var word = wordsArr[i].Item1;
current += word;
}
var com = new TextRenderCommand(attributes, new TextRenderTextContent(current));
var key = GetElementKey(com);
var elWidth = GetElementWidth(key, com);
if (!((elWidth + LineWidth) > TextCanvas.ActualWidth))
{
idx1 = j;
break;
}
}
bool exceeded = false;
current = "";
for (int i = 0; i < wordsArr.Length; i++)
{
var word = wordsArr[i].Item1;
current += word;
if (exceeded)
{
yield return new Tuple<string, bool, Func<FrameworkElement>, bool>(word, false, () => null, true);
}
else
{
var com = new TextRenderCommand(attributes, new TextRenderTextContent(current));
var key = GetElementKey(com);
if (i > idx1)
{
var elWidth = GetElementWidth(key, com);
if ((elWidth + LineWidth) > TextCanvas.ActualWidth)
{
exceeded = true;
}
yield return new Tuple<string, bool, Func<FrameworkElement>, bool>(word, !exceeded, ExtractElement(key, com), false);
}
else
{
yield return new Tuple<string, bool, Func<FrameworkElement>, bool>(word, true, ExtractElement(key, com), false);
}
}
}
}
protected IEnumerable<Tuple<string, double>> GetRoughLengths(ITextRenderAttributeState attributes, IEnumerable<string> words)
{
var wordsArr = words.ToArray();
var agg = wordsArr.Aggregate(new StringBuilder(), (sb, s) => sb.Append(s)).ToString();
var aggCom = new TextRenderCommand(attributes, new TextRenderTextContent(agg));
var aggKey = GetElementKey(aggCom);
var totalWidth = GetElementWidth(aggKey, aggCom);
var totalCount = agg.Length > 0 ? agg.Length : 1;
int cnt = 0;
foreach (var word in wordsArr)
{
cnt += word.Length;
yield return new Tuple<string, double>(word, totalWidth * cnt / totalCount);
}
}
private double GetOWidth(ITextRenderAttributeState attributes, TextBlock r)
{
var key = GetCacheKey(new TextRenderCommand(attributes, new TextRenderTextContent("o")));
if (!OWidthCache.ContainsKey(key))
{
var s2 = r.Text;
r.Text = "o";
r.Measure(new Size(0, 0));
OWidthCache[key] = r.ActualWidth;
r.Text = s2;
}
return OWidthCache[key];
}
