// This is actual implementation to make highlight change notification.
// This is called when highlight needs to be changed without public TextSelection change event.
internal void InternalOnSelectionChanged()
{
ITextPointer newStart;
ITextPointer newEnd;
ITextPointer invalidRangeLeftStart;
ITextPointer invalidRangeLeftEnd;
ITextPointer invalidRangeRightStart;
ITextPointer invalidRangeRightEnd;
TextSelectionHighlightChangedEventArgs args;
// If the current seleciton is interim selection, we do not highlight it
// and we make newStart == newEnd.
if (!_selection.IsInterimSelection)
{
newStart = _selection.Start;
}
else
{
newStart = _selection.End;
}
newEnd = _selection.End;
// We want to raise an event that tracks the change tightly --
// only identifying content where the selection status actually changed.
// This is important for render performance.
//
// Ex:
// Old selection: 012<selection>345</selection>678
// New selection: 0123<selection>456</selection>78
//
// Should raise (3-3), (6-6) as deltas, not (3-6).
//
// Get the left side invalid range.
if (_oldStart.CompareTo(newStart) < 0)
{
invalidRangeLeftStart = _oldStart;
invalidRangeLeftEnd = TextPointerBase.Min(newStart, _oldEnd);
}
else
{
invalidRangeLeftStart = newStart;
invalidRangeLeftEnd = TextPointerBase.Min(newEnd, _oldStart);
}
// Get the right side invalid range.
if (_oldEnd.CompareTo(newEnd) < 0)
{
invalidRangeRightStart = TextPointerBase.Max(newStart, _oldEnd);
invalidRangeRightEnd = newEnd;
}
else
{
invalidRangeRightStart = TextPointerBase.Max(newEnd, _oldStart);
invalidRangeRightEnd = _oldEnd;
}
_oldStart = newStart;
_oldEnd = newEnd;
if (this.Changed != null)
{
if (invalidRangeLeftStart.CompareTo(invalidRangeLeftEnd) != 0 || invalidRangeRightStart.CompareTo(invalidRangeRightEnd) != 0)
{
args = new TextSelectionHighlightChangedEventArgs(invalidRangeLeftStart, invalidRangeLeftEnd, invalidRangeRightStart, invalidRangeRightEnd);
this.Changed(this, args);
}
}
}
// This is actual implementation to make highlight change notification.
// This is called when highlight needs to be changed without public TextSelection change event.
internal void InternalOnSelectionChanged()
{
ITextPointer newStart;
ITextPointer newEnd;
ITextPointer invalidRangeLeftStart;
ITextPointer invalidRangeLeftEnd;
ITextPointer invalidRangeRightStart;
ITextPointer invalidRangeRightEnd;
TextSelectionHighlightChangedEventArgs args;
// If the current seleciton is interim selection, we do not highlight it
// and we make newStart == newEnd.
if (!_selection.IsInterimSelection)
{
newStart = _selection.Start;
}
else
{
newStart = _selection.End;
}
newEnd = _selection.End;
// We want to raise an event that tracks the change tightly --
// only identifying content where the selection status actually changed.
// This is important for render performance.
//
// Ex:
// Old selection: 012<selection>345</selection>678
// New selection: 0123<selection>456</selection>78
//
// Should raise (3-3), (6-6) as deltas, not (3-6).
//
// Get the left side invalid range.
if (_oldStart.CompareTo(newStart) < 0)
{
invalidRangeLeftStart = _oldStart;
invalidRangeLeftEnd = TextPointerBase.Min(newStart, _oldEnd);
}
else
{
invalidRangeLeftStart = newStart;
invalidRangeLeftEnd = TextPointerBase.Min(newEnd, _oldStart);
}
// Get the right side invalid range.
if (_oldEnd.CompareTo(newEnd) < 0)
{
invalidRangeRightStart = TextPointerBase.Max(newStart, _oldEnd);
invalidRangeRightEnd = newEnd;
}
else
{
invalidRangeRightStart = TextPointerBase.Max(newEnd, _oldStart);
invalidRangeRightEnd = _oldEnd;
}
_oldStart = newStart;
_oldEnd = newEnd;
if (this.Changed != null)
{
if (invalidRangeLeftStart.CompareTo(invalidRangeLeftEnd) != 0 || invalidRangeRightStart.CompareTo(invalidRangeRightEnd) != 0)
{
args = new TextSelectionHighlightChangedEventArgs(invalidRangeLeftStart, invalidRangeLeftEnd, invalidRangeRightStart, invalidRangeRightEnd);
this.Changed(this, args);
}
}
}
