/// <summary>
/// Returns a TextSegment that spans the line on which position is located.
/// </summary>
/// <param name="position">
/// Any oriented text position on the line.
/// </param>
/// <returns>
/// TextSegment that spans the line on which position is located.
/// </returns>
/// <exception cref="System.InvalidOperationException">
/// Throws InvalidOperationException if IsValid is false.
/// If IsValid returns false, Validate method must be called before
/// calling this method.
/// </exception>
internal override TextSegment GetLineRange(ITextPointer position)
{
DocumentsTrace.FixedDocumentSequence.TextOM.Trace(string.Format("GetLineRange {0} {1}", position, position.LogicalDirection));
DocumentSequenceTextPointer tpStart = null;
DocumentSequenceTextPointer tpEnd = null;
DocumentSequenceTextPointer tpLine = null;
if (position != null)
{
if (ChildTextView != null)
{
tpLine = _docPage.FixedDocumentSequence.TextContainer.VerifyPosition(position);
if (ChildTextView.TextContainer == tpLine.ChildBlock.ChildContainer)
{
TextSegment childTR = ChildTextView.GetLineRange(tpLine.ChildPointer.CreatePointer(position.LogicalDirection));
if (!childTR.IsNull)
{
tpStart = new DocumentSequenceTextPointer(ChildBlock, childTR.Start);
tpEnd = new DocumentSequenceTextPointer(ChildBlock, childTR.End);
return(new TextSegment(tpStart, tpEnd, true));
}
}
}
}
return(TextSegment.Null);
}
/// <summary>
/// Retrieves an oriented text position matching position advanced by
/// a number of lines from its initial position.
/// </summary>
/// <param name="position">
/// Initial text position of an object/character.
/// </param>
/// <param name="suggestedX">
/// The suggested X offset, in pixels, of text position on the destination
/// line. If suggestedX is set to Double.NaN it will be ignored, otherwise
/// the method will try to find a position on the destination line closest
/// to suggestedX.
/// </param>
/// <param name="count">
/// Number of lines to advance. Negative means move backwards.
/// </param>
/// <param name="newSuggestedX">
/// newSuggestedX is the offset at the position moved (useful when moving
/// between columns or pages).
/// </param>
/// <param name="linesMoved">
/// linesMoved indicates the number of lines moved, which may be less
/// than count if there is no more content.
/// </param>
/// <returns>
/// A TextPointer and its orientation matching suggestedX on the
/// destination line.
/// </returns>
/// <exception cref="System.InvalidOperationException">
/// Throws InvalidOperationException if IsValid is false.
/// If IsValid returns false, Validate method must be called before
/// calling this method.
/// </exception>
internal override ITextPointer GetPositionAtNextLine(ITextPointer position, double suggestedX, int count, out double newSuggestedX, out int linesMoved)
{
newSuggestedX = suggestedX;
linesMoved = count;
DocumentsTrace.FixedDocumentSequence.TextOM.Trace(string.Format("GetPositionAtNextLine {0} {1} {2} {3} ", position, position.LogicalDirection, suggestedX, count));
DocumentSequenceTextPointer newTp = null;
LogicalDirection newEdge = LogicalDirection.Forward;
DocumentSequenceTextPointer tp = null;
if (position != null)
{
tp = _docPage.FixedDocumentSequence.TextContainer.VerifyPosition(position);
}
// Note we do not handle cross page navigation
if (tp != null)
{
if (ChildTextView != null)
{
if (ChildTextView.TextContainer == tp.ChildBlock.ChildContainer)
{
ITextPointer childOTP = ChildTextView.GetPositionAtNextLine(tp.ChildPointer.CreatePointer(position.LogicalDirection), suggestedX, count, out newSuggestedX, out linesMoved);
if (childOTP != null)
{
newTp = new DocumentSequenceTextPointer(ChildBlock, childOTP);
newEdge = childOTP.LogicalDirection;
}
}
}
}
return(DocumentSequenceTextPointer.CreatePointer(newTp, newEdge));
}
/// <summary>
/// Retrieves the height and offset, in pixels, of the edge of
/// the object/character represented by position.
/// </summary>
/// <param name="position">
/// Position of an object/character.
/// </param>
/// <param name="transform">
/// Transform to be applied to returned rect
/// </param>
/// <returns>
/// The height, in pixels, of the edge of the object/character
/// represented by position.
/// </returns>
/// <exception cref="System.InvalidOperationException">
/// Throws InvalidOperationException if IsValid is false.
/// If IsValid returns false, Validate method must be called before
/// calling this method.
/// </exception>
/// <remarks>
/// Rect.Width is always 0.
///
/// If the document is empty, then this method returns the expected
/// height of a character, if placed at the specified position.
/// </remarks>
internal override Rect GetRawRectangleFromTextPosition(ITextPointer position, out Transform transform)
{
DocumentsTrace.FixedDocumentSequence.TextOM.Trace(string.Format("GetRawRectangleFromTextPosition {0} {1}", position, position.LogicalDirection));
DocumentSequenceTextPointer tp = null;
// Initialize transform to identity
transform = Transform.Identity;
if (position != null)
{
tp = _docPage.FixedDocumentSequence.TextContainer.VerifyPosition(position);
}
if (tp != null)
{
if (ChildTextView != null)
{
if (ChildTextView.TextContainer == tp.ChildBlock.ChildContainer)
{
return(ChildTextView.GetRawRectangleFromTextPosition(tp.ChildPointer.CreatePointer(position.LogicalDirection), out transform));
}
}
}
return(Rect.Empty);
}
/// <see cref="ITextView.Validate(Point)"/>
internal override bool Validate(Point point)
{
if (ChildTextView != null)
{
ChildTextView.Validate(point);
}
return(((ITextView)this).IsValid);
}
/// <summary>
/// <see cref="TextViewBase.GetTightBoundingGeometryFromTextPositions"/>
/// </summary>
internal override Geometry GetTightBoundingGeometryFromTextPositions(ITextPointer startPosition, ITextPointer endPosition)
{
if (startPosition != null && endPosition != null && ChildTextView != null)
{
DocumentSequenceTextPointer startTp = null;
DocumentSequenceTextPointer endTp = null;
startTp = _docPage.FixedDocumentSequence.TextContainer.VerifyPosition(startPosition);
endTp = _docPage.FixedDocumentSequence.TextContainer.VerifyPosition(endPosition);
if (startTp != null && endTp != null)
{
return(ChildTextView.GetTightBoundingGeometryFromTextPositions(startTp.ChildPointer, endTp.ChildPointer));
}
}
return(new PathGeometry());;
}
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
/// <summary>
/// Retrieves a position matching a point.
/// </summary>
/// <param name="point">
/// Point in pixel coordinates to test.
/// </param>
/// <param name="snapToText">
/// If true, this method must always return a positioned text position
/// (the closest position as calculated by the control's heuristics).
/// If false, this method should return null position, if the test
/// point does not fall within any character bounding box.
/// </param>
/// <returns>
/// A text position and its orientation matching or closest to the point.
/// </returns>
/// <exception cref="System.InvalidOperationException">
/// Throws InvalidOperationException if IsValid is false.
/// If IsValid returns false, Validate method must be called before
/// calling this method.
/// </exception>
internal override ITextPointer GetTextPositionFromPoint(Point point, bool snapToText)
{
DocumentsTrace.FixedDocumentSequence.TextOM.Trace(string.Format("GetTextPositionFromPoint {0}-{1}", point, snapToText));
DocumentSequenceTextPointer tp = null;
LogicalDirection edge = LogicalDirection.Forward;
if (ChildTextView != null)
{
ITextPointer childOTP = ChildTextView.GetTextPositionFromPoint(point, snapToText);
if (childOTP != null)
{
tp = new DocumentSequenceTextPointer(ChildBlock, childOTP);
edge = childOTP.LogicalDirection;
}
}
// When snapToText is true, ChildTextView.GetTextPositionFromPoint will guranttee to
// return a non-null position.
// In current code, ChildTextView can't be null.
return(tp == null ? null : DocumentSequenceTextPointer.CreatePointer(tp, edge));
}
/// <summary>
/// Determines whenever TextView contains specified position.
/// </summary>
/// <param name="position">
/// A position to test.
/// </param>
/// <returns>
/// True if TextView contains specified text position.
/// Otherwise returns false.
/// </returns>
/// <exception cref="System.InvalidOperationException">
/// Throws InvalidOperationException if IsValid is false.
/// If IsValid returns false, Validate method must be called before
/// calling this method.
/// </exception>
internal override bool Contains(ITextPointer position)
{
DocumentsTrace.FixedDocumentSequence.TextOM.Trace(string.Format("Contains {0} {1}", position, position.LogicalDirection));
DocumentSequenceTextPointer tp = null;
if (position != null)
{
tp = _docPage.FixedDocumentSequence.TextContainer.VerifyPosition(position);
}
// Note we do not handle cross page navigation
if (tp != null)
{
if (ChildTextView != null)
{
if (ChildTextView.TextContainer == tp.ChildBlock.ChildContainer)
{
return(ChildTextView.Contains(tp.ChildPointer.CreatePointer(position.LogicalDirection)));
}
}
}
return(false);
}
