/// <summary>
/// Returns an ArrayList of rectangles (Rect) that form the bounds of the region specified between
/// the start and end points
/// </summary>
/// <param name="cp"></param>
/// int offset indicating the starting point of the region for which bounds are required
/// <param name="cch">
/// Length in characters of the region for which bounds are required
/// </param>
/// <param name="xOffset">
/// Offset of line in x direction, to be added to line bounds to get actual rectangle for line
/// </param>
/// <param name="yOffset">
/// Offset of line in y direction, to be added to line bounds to get actual rectangle for line
/// </param>
/// <remarks>
/// This function calls GetTextBounds for the line, and then checks if there are text run bounds. If they exist,
/// it uses those as the bounding rectangles. If not, it returns the rectangle for the first (and only) element
/// of the text bounds.
/// </remarks>
internal List <Rect> GetRangeBounds(int cp, int cch, double xOffset, double yOffset)
{
List <Rect> rectangles = new List <Rect>();
// Adjust x offset for trailing spaces
double delta = CalculateXOffsetShift();
double adjustedXOffset = xOffset + delta;
IList <TextBounds> textBounds;
if (_line.HasOverflowed && _owner.ParagraphProperties.TextTrimming != TextTrimming.None)
{
// We should not shift offset in this case
Invariant.Assert(DoubleUtil.AreClose(delta, 0));
System.Windows.Media.TextFormatting.TextLine line = _line.Collapse(GetCollapsingProps(_wrappingWidth, _owner.ParagraphProperties));
Invariant.Assert(line.HasCollapsed, "Line has not been collapsed");
textBounds = line.GetTextBounds(cp, cch);
}
else
{
textBounds = _line.GetTextBounds(cp, cch);
}
Invariant.Assert(textBounds.Count > 0);
for (int boundIndex = 0; boundIndex < textBounds.Count; boundIndex++)
{
Rect rect = textBounds[boundIndex].Rectangle;
rect.X += adjustedXOffset;
rect.Y += yOffset;
rectangles.Add(rect);
}
return(rectangles);
}
//-------------------------------------------------------------------
//
// Protected Methods
//
//-------------------------------------------------------------------
#region Protected Methods
// ------------------------------------------------------------------
// Retrieve bounds of an object/character at specified text index.
//
// cp - character index of an object/character
// cch - number of positions occupied by object/character
// flowDirection - flow direction of object/character
//
// Returns: Bounds of an object/character.
// ------------------------------------------------------------------
protected Rect GetBoundsFromPosition(int cp, int cch, out FlowDirection flowDirection)
{
Rect rect;
// Adjust x offset for trailing spaces
double delta = CalculateXOffsetShift();
IList <TextBounds> textBounds;
if (_line.HasOverflowed && _owner.ParagraphProperties.TextTrimming != TextTrimming.None)
{
// We should not shift offset in this case
Invariant.Assert(DoubleUtil.AreClose(delta, 0));
System.Windows.Media.TextFormatting.TextLine line = _line.Collapse(GetCollapsingProps(_wrappingWidth, _owner.ParagraphProperties));
Invariant.Assert(line.HasCollapsed, "Line has not been collapsed");
textBounds = line.GetTextBounds(cp, cch);
}
else
{
textBounds = _line.GetTextBounds(cp, cch);
}
Invariant.Assert(textBounds != null && textBounds.Count == 1, "Expecting exactly one TextBounds for a single text position.");
IList <TextRunBounds> runBounds = textBounds[0].TextRunBounds;
if (runBounds != null)
{
Debug.Assert(runBounds.Count == 1, "Expecting exactly one TextRunBounds for a single text position.");
rect = runBounds[0].Rectangle;
}
else
{
rect = textBounds[0].Rectangle;
}
rect.X += delta;
flowDirection = textBounds[0].FlowDirection;
return(rect);
}
private List<textView.TextBounds> GetTextBoundsOnLine(TextLine textLine, Double horizontalOffset, Int32 startIndex, Int32 endIndex)
{
var list = new List<textView.TextBounds>();
if (startIndex == endIndex)
{
Double distanceFromCharacterHit = textLine.GetDistanceFromCharacterHit(new CharacterHit(startIndex, 0));
list.Add(new textView.TextBounds((distanceFromCharacterHit + horizontalOffset) + this.HorizontalOffset, this.VerticalOffset, 0, this.Height));
return list;
}
foreach (textFormatting.TextBounds bounds in textLine.GetTextBounds(startIndex, endIndex - startIndex))
{
list.Add(new textView.TextBounds(bounds.Rectangle.Left + horizontalOffset, bounds.Rectangle.Top + this.VerticalOffset, bounds.Rectangle.Width, this.Height));
}
return list;
}
