ITextRangeProvider [] ITextProvider.GetSelection()
{
// we must have called EnsureTextDocument() before arriving here.
Debug.Assert(_document != null);
// clone a range from the documents selection
ITextRange range = null;
ITextSelection selection = _document.Selection;
if (selection != null)
{
// duplicate the selection range since we don't want their modifications to affect the selection
range = selection.GetDuplicate();
// for future reference: active endpoint is
// ((selection.Flags & TomSelectionFlags.tomSelStartActive) == TomSelectionFlags.tomSelStartActive) ? TextPatternRangeEndpoint.Start : TextPatternRangeEndpoint.End;
}
if (range == null)
{
return new ITextRangeProvider[] { }
}
;
else
{
return new ITextRangeProvider[] { new WindowsRichEditRange(range, this) }
};
}
ITextRangeProvider [] ITextProvider.GetVisibleRanges()
{
ITextRange range = GetVisibleRange();
if (range == null)
{
return new ITextRangeProvider[] { }
}
;
else
{
return new ITextRangeProvider[] { new WindowsRichEditRange(range, this) }
};
}
ITextRangeProvider ITextProvider.RangeFromChild(IRawElementProviderSimple childElement)
{
// we don't have any children so this call must be in error.
// if we implement children for hyperlinks and embedded objects then we'll need to change this.
throw new InvalidOperationException(SR.Get(SRID.RichEditTextPatternHasNoChildren, GetType().FullName));
}
ITextRangeProvider ITextProvider.RangeFromPoint(Point screenLocation)
{
// we must have called EnsureTextDocument() before arriving here.
Debug.Assert(_document != null);
// TextPattern has verified that the point is inside our client area so we don't need to check for that.
// get the degenerate range at the point
// we're assuming ITextDocument::RangeFromPoint always returns a degenerate range
ITextRange range = _document.RangeFromPoint((int)screenLocation.X, (int)screenLocation.Y);
Debug.Assert(range.Start == range.End);
// if you wanted to get the character under the point instead of the degenerate range nearest
// the point, then you would add:
//// if the point is within the character to the right then expand the degenerate range to
//// include the character.
//Rect rect;
//range.MoveEnd(TomUnit.tomCharacter, 1);
//rect = WindowsRichEditRange.GetSingleLineRangeRectangle(range, BoundingRectangle);
//if (!rect.Contains(screenLocation))
//{
// // if the point is within the character to the left then expand the degenerate range
// // to include the character.
// range.Collapse(TomStartEnd.tomStart);
// range.MoveStart(TomUnit.tomCharacter, -1);
// rect = WindowsRichEditRange.GetSingleLineRangeRectangle(range, BoundingRectangle);
// if (!rect.Contains(screenLocation))
// {
// // the point is not in an adjacent character cell so leave it degenerate.
// range.Collapse(TomStartEnd.tomEnd);
// }
//}
return(range != null ? new WindowsRichEditRange(range, this) : null);
}
#endregion TextPattern Methods
#region TextPattern Properties
ITextRangeProvider ITextProvider.DocumentRange
{
get
{
// we must have called EnsureTextDocument() before arriving here.
Debug.Assert(_document != null);
// create a text range that covers the entire main story.
ITextRange range = _document.Range(0, 0);
range.SetRange(0, range.StoryLength);
return(new WindowsRichEditRange(range, this));
}
}
SupportedTextSelection ITextProvider.SupportedTextSelection
{
get
{
return(SupportedTextSelection.Single);
}
}