private void ElementChildren_Updated(object sender, RichTextPanelEventArgs e)
{
double viewportWidth;
double widthWithScroll;
if (ElementContainer != null && AutoWrap)
{
viewportWidth = RenderSize.Width - (ElementContainer.BorderThickness.Left + ElementContainer.BorderThickness.Right + ElementContainer.Padding.Left + ElementContainer.Padding.Right);
widthWithScroll = viewportWidth - 17;
if (ElementChildren.Height > ElementContainer.ViewportHeight && _wrapWidth > widthWithScroll)
{
_wrapWidth = (RenderSize.Width >= 74 ? widthWithScroll : 20);
if (VerticalScrollBarVisibility == ScrollBarVisibility.Disabled || VerticalScrollBarVisibility == ScrollBarVisibility.Hidden)
{
_wrapWidth = viewportWidth;
}
ElementChildren.Width = _wrapWidth;
}
else if (ElementChildren.Height < ElementContainer.ViewportHeight && _wrapWidth < viewportWidth)
{
_wrapWidth = viewportWidth;
ElementChildren.Width = _wrapWidth;
}
else
{
if (VerticalScrollBarVisibility == ScrollBarVisibility.Disabled || VerticalScrollBarVisibility == ScrollBarVisibility.Hidden)
{
_wrapWidth = viewportWidth;
}
ElementChildren.Width = _wrapWidth;
}
if (ElementChildren.Height < ElementContainer.ViewportHeight && _contentScrollable)
{
_contentScrollable = false;
RaiseRichTextEvent(ContentHideVerticalScrollBar, this, new RichTextBoxEventArgs(), false);
}
else if (ElementChildren.Height >= ElementContainer.ViewportHeight && !_contentScrollable)
{
_contentScrollable = true;
RaiseRichTextEvent(ContentShowVerticalScrollBar, this, new RichTextBoxEventArgs(), false);
}
ElementChildren.MinHeight = ElementContainer.ViewportHeight;
}
}
/// <summary>
/// Merges TextBlock elements with the same style name (Tag property)
/// </summary>
/// <param name="row">Row to compact</param>
/// <param name="ignore">Element to ignore when compacting the row</param>
private void CompactRow(RichTextPanelRow row, UIElement ignore)
{
_removed = 0;
if (row == null)
{
return;
}
int startIndex = ContentChildren.IndexOf(row.Start);
int endIndex = ContentChildren.IndexOf(row.End);
RichTextPanelEventArgs args;
TextBlockPlus current;
TextBlockPlus next;
bool tagMatched = false;
int i;
if (startIndex < 0 || endIndex < 0)
{
return;
}
for (i = endIndex - 1; i >= startIndex; i--)
{
if (ContentChildren[i] is TextBlockPlus && ContentChildren[i] != ignore)
{
current = (TextBlockPlus)ContentChildren[i];
if (ContentChildren[i + 1] is TextBlockPlus && ContentChildren[i + 1] != ignore)
{
next = (TextBlockPlus)ContentChildren[i + 1];
tagMatched = false;
if (current.Tag is RichTextTag && next.Tag is RichTextTag)
{
if (((RichTextTag)current.Tag).CompareTo(next.Tag) == 0)
{
if (current.Text.Length > 0)
{
args = new RichTextPanelEventArgs(current)
{
Created = next, Index = current.Text.Length
};
current.Text += next.Text;
RaiseEvent(TextBlockMerge, this, args);
if (!args.Cancel)
{
ContentChildren.Remove(next);
if (row.End == next)
{
row.End = current;
}
_removed++;
}
}
else
{
ContentChildren.Remove(current);
if (row.End == current)
{
row.End = next;
}
if (row.Start == current)
{
row.Start = next;
}
_removed++;
}
tagMatched = true;
}
}
if (!tagMatched && current.Text.Length == 0)
{
ContentChildren.Remove(current);
if (row.Start == current)
{
row.Start = next;
}
_removed++;
}
}
}
}
}
internal void Update(RichTextPanelRow topRow, bool updateAll, UIElement ignore)
{
int rowIndex = _rows.IndexOf(topRow);
int startIndex = 0;
int rowEndIndex = 0;
Point pos = new Point();
double thisWidth = 0;
List <string> splitText;
TextBlockPlus currentTextBlock;
TextBlockPlus next;
RichTextPanelRow temp;
RichTextPanelEventArgs args;
FrameworkElement current;
Table table;
bool updateNextLine = false;
bool newlineStarted = false;
bool createBlankTextBlock;
int startRow = 0;
int lineOut = 1;
int endRow;
double offset;
int i;
int a;
int b;
if (ActualWidth == 0)
{
return;
}
if (rowIndex >= 0)
{
startIndex = ContentChildren.IndexOf(_rows[rowIndex].Start);
rowEndIndex = ContentChildren.IndexOf(_rows[rowIndex].End);
}
else
{
rowIndex = 0;
}
startRow = rowIndex;
_tempRows.Clear();
if (rowIndex < _rows.Count)
{
pos.Y = _rows[rowIndex].Position.Y;
}
if (startIndex < 0)
{
return;
}
for (i = startIndex; i < ContentChildren.Count; i++)
{
newlineStarted = false;
current = (FrameworkElement)ContentChildren[i];
current.SetValue(Canvas.LeftProperty, pos.X);
current.SetValue(Canvas.TopProperty, pos.Y);
if (!(current is TextBlockPlus))
{
if (current is Table)
{
table = (Table)current;
if (table.AutoWidth)
{
table.Width = (double.IsNaN(Width) ? ActualWidth : Width) - pos.X;
}
thisWidth = table.Width;
}
else
{
thisWidth = (double.IsNaN(current.Width) ? current.ActualWidth : current.Width);
}
}
else
{
currentTextBlock = (TextBlockPlus)current;
thisWidth = currentTextBlock.ContentWidth;
if (pos.X + thisWidth > ActualWidth)
{
splitText = SplitText(currentTextBlock, currentTextBlock.Text, pos.X, ActualWidth);
if (splitText.Count > 1)
{
b = 0;
args = new RichTextPanelEventArgs(currentTextBlock)
{
Created = null, Index = b
};
RaiseEvent(TextBlockSplit, this, args);
if (!args.Cancel)
{
currentTextBlock.Text = splitText[0];
args = new RichTextPanelEventArgs(currentTextBlock)
{
Created = currentTextBlock, Index = b
};
RaiseEvent(TextBlockSplit, this, args);
for (a = 1; a < splitText.Count; a++)
{
next = CreateTextBlock(splitText[a]);
args = new RichTextPanelEventArgs(currentTextBlock)
{
Created = next, Index = b
};
RaiseEvent(TextBlockSplit, this, args);
if (!args.Cancel)
{
ContentChildren.Insert(i + a, next);
b += splitText[a].Length;
}
}
}
if (currentTextBlock.Text.Length == 0)
{
pos.X = 99999;
}
}
updateNextLine = true;
lineOut = 1;
}
thisWidth = currentTextBlock.ContentWidth;
}
pos.X += thisWidth;
if (current is Newline)
{
createBlankTextBlock = (i == 0);
if (i > 0)
{
if (ContentChildren[i - 1] is TextBlockPlus)
{
currentTextBlock = (TextBlockPlus)ContentChildren[i - 1];
if (current.Tag != currentTextBlock.Tag)
{
RaiseEvent(ApplyFormatting, this, new RichTextPanelEventArgs(currentTextBlock)
{
Created = current
});
}
}
else
{
createBlankTextBlock = true;
}
}
if (createBlankTextBlock)
{
next = CreateTextBlock("");
args = new RichTextPanelEventArgs(current)
{
Created = next
};
RaiseEvent(TextBlockSplit, this, args);
if (!args.Cancel)
{
next.SetValue(Canvas.LeftProperty, pos.X - thisWidth);
next.SetValue(Canvas.TopProperty, pos.Y);
ContentChildren.Insert(i, next);
i++;
}
}
newlineStarted = true;
pos.Y += UpdateRowContent(startIndex, i, ignore);
i -= _removed;
pos.X = 0;
startIndex = i + 1;
}
else
{
if (pos.X > ActualWidth)
{
newlineStarted = true;
pos.Y += UpdateRowContent(startIndex, i - 1, ignore);
i -= _removed;
if (i < 0)
{
break;
}
pos.X = 0;
current.SetValue(Canvas.LeftProperty, pos.X);
current.SetValue(Canvas.TopProperty, pos.Y);
pos.X = thisWidth;
startIndex = i;
}
}
if (newlineStarted && i > rowEndIndex)
{
if (!updateAll && !updateNextLine)
{
if (lineOut <= 0)
{
break;
}
lineOut--;
}
updateNextLine = false;
}
else if (i == ContentChildren.Count - 1 && startIndex < i)
{
UpdateRowContent(startIndex, i, ignore);
i -= _removed;
}
}
temp = GetRowForElementIndex(i);
endRow = (i == ContentChildren.Count && _rows.Count > 0 ? _rows.Count - 1 : _rows.IndexOf(temp));
if (endRow >= 0)
{
_rows.RemoveRange(startRow, (endRow - startRow) + 1);
}
_rows.InsertRange(startRow, _tempRows);
a = startRow + _tempRows.Count;
if (endRow >= 0 && endRow < _rows.Count - 1 && a < _rows.Count)
{
offset = (_rows[a - 1].Position.Y + _rows[a - 1].Dimensions.Y) - _rows[a].Position.Y;
startIndex = ContentChildren.IndexOf(_rows[a].Start);
if (offset != 0)
{
// Reposition following rows if the size of the modified rows has changed
for (i = a; i < _rows.Count; i++)
{
_rows[i].Position = new Point(_rows[i].Position.X, _rows[i].Position.Y + offset);
}
for (i = startIndex; i < ContentChildren.Count; i++)
{
ContentChildren[i].SetValue(Canvas.TopProperty, (double)ContentChildren[i].GetValue(Canvas.TopProperty) + offset);
}
}
}
if (Rows.Count > 0)
{
CalculateRowDimensions(Rows[Rows.Count - 1], false);
SetElementAlignment(Rows[Rows.Count - 1]);
}
_lastUpdatedSize = ActualWidth;
UpdateCanvasSize();
RaiseEvent(Updated, this, null);
}
/// <summary>
/// Generates the specified event
/// </summary>
/// <param name="sender">Event source object</param>
/// <param name="args">Event arguments</param>
protected virtual void RaiseEvent(RichTextPanelEventHandler handler, object sender, RichTextPanelEventArgs args)
{
if (handler != null)
{
handler(sender, args);
}
}