// Inserts an InkInteropObject at a specified position.
private TextPointer InsertInkAtPosition(TextPointer insertionPosition, InkInteropObject inkobject, out UnsafeNativeMethods.TS_TEXTCHANGE change)
{
int symbolsAddedBefore = 0;
int symbolsAddedAfter = 0;
// Prepare an insertion position for InlineUIContainer.
// As an optimization, shift outside of any formatting tags to avoid
// splitting tags below.
while (insertionPosition.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.ElementStart &&
TextSchema.IsFormattingType(insertionPosition.Parent.GetType()))
{
insertionPosition = insertionPosition.GetNextContextPosition(LogicalDirection.Backward);
}
while (insertionPosition.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.ElementEnd &&
TextSchema.IsFormattingType(insertionPosition.Parent.GetType()))
{
insertionPosition = insertionPosition.GetNextContextPosition(LogicalDirection.Forward);
}
// If we need to, split the current parent TextElement and prepare
// a suitable home for an InlineUIContainer.
if (!TextSchema.IsValidParent(insertionPosition.Parent.GetType(), typeof(InlineUIContainer)))
{
insertionPosition = TextRangeEditTables.EnsureInsertionPosition(insertionPosition, out symbolsAddedBefore, out symbolsAddedAfter);
Invariant.Assert(insertionPosition.Parent is Run, "position must be in Run scope");
insertionPosition = TextRangeEdit.SplitElement(insertionPosition);
// We need to remember how many symbols were added into addition
// to the InlineUIContainer itself.
// Account for the two element edges just added.
symbolsAddedBefore += 1;
symbolsAddedAfter += 1;
}
// Create an InlineUIContainer.
InlineUIContainer inlineUIContainer = new InlineUIContainer(inkobject);
change.start = ((ITextPointer)insertionPosition).Offset - symbolsAddedBefore;
change.oldEnd = change.start;
// Insert it into the insertionPosition. This adds 3 symbols.
insertionPosition.InsertTextElement(inlineUIContainer);
change.newEnd = change.start + symbolsAddedBefore + inlineUIContainer.SymbolCount + symbolsAddedAfter;
// Return a position after the inserted object.
return inlineUIContainer.ElementEnd.GetInsertionPosition(LogicalDirection.Forward);
}
private void InsertEmbeddedAtPosition(TextPointer position, IComDataObject data, out UnsafeNativeMethods.TS_TEXTCHANGE change)
{
SecurityHelper.DemandUnmanagedCode();
ITextContainer container;
// Get enhanced metafile handle from IOleDataObject.
FORMATETC formatetc = new FORMATETC();
STGMEDIUM stgmedium = new STGMEDIUM();
formatetc.cfFormat = NativeMethods.CF_ENHMETAFILE;
formatetc.ptd = IntPtr.Zero;
formatetc.dwAspect = DVASPECT.DVASPECT_CONTENT;
formatetc.lindex = -1;
formatetc.tymed = TYMED.TYMED_ENHMF;
stgmedium.tymed = TYMED.TYMED_ENHMF;
data.GetData(ref formatetc, out stgmedium);
if (stgmedium.unionmember == IntPtr.Zero)
{
throw new COMException(SR.Get(SRID.TextStore_BadObjectData), NativeMethods.E_INVALIDARG);
}
IntPtr hbitmap = SystemDrawingHelper.ConvertMetafileToHBitmap(stgmedium.unionmember);
// create a InkInteropObject framework element.
InkInteropObject inkobject = new InkInteropObject(data);
inkobject.Source = Imaging.CreateBitmapSourceFromHBitmap(hbitmap, IntPtr.Zero, Int32Rect.Empty, null);
position = InsertInkAtPosition(position, inkobject, out change);
// Move the selection.
container = this.TextContainer;
TextSelection.SetCaretToPosition(position, LogicalDirection.Backward, /*allowStopAtLineEnd:*/false, /*allowStopNearSpace:*/false);
}