/// <summary> /// Takes the source HTML and makes necessary modifications to keep the source formatting as if it were to be /// pasted into the destination range. /// </summary> /// <param name="sourceRange">The range containing the HTML that is being copied.</param> /// <param name="destinationRange">The range that the source HTML will be copied to.</param> /// <returns>A serialized string of the source HTML with necessary modifications to keep the source formatting /// or null if unsuccessful.</returns> private string KeepSourceFormatting(MarkupRange sourceRange, MarkupRange destinationRange) { Debug.Assert(sourceRange.Start.Container.GetOwningDoc() == destinationRange.Start.Container.GetOwningDoc(), "Ranges must share an owning document!"); // We will temporarily add comments to the destination document to mark the destinationRange. IHTMLElement startComment = null; IHTMLElement endComment = null; try { // This is our true destination document. IHTMLDocument2 destinationDocument = destinationRange.Start.Container.Document; MshtmlMarkupServices destinationMarkupServices = new MshtmlMarkupServices((IMarkupServicesRaw)destinationDocument); // However, we'll use a temp destination because we don't want to paste anything into the real // document yet as it could fail, it would fire events, images would start loading, etc. MarkupContainer temporaryDestinationContainer = destinationMarkupServices.CreateMarkupContainer(); MarkupPointer temporaryDestinationPointer = destinationMarkupServices.CreateMarkupPointer(); temporaryDestinationPointer.MoveToContainer(temporaryDestinationContainer, true); // We add in comments to the destination document so that when we copy this range over to the fake // destination we'll be able to find the range again. destinationRange.Start.Gravity = _POINTER_GRAVITY.POINTER_GRAVITY_Left; destinationRange.End.Gravity = _POINTER_GRAVITY.POINTER_GRAVITY_Right; string startMarker = string.Format(CultureInfo.InvariantCulture, "<!--{0}-->", Guid.NewGuid()); destinationMarkupServices.InsertHtml(startMarker, destinationRange.Start); startComment = destinationRange.Start.Right(false).Element; string endMarker = string.Format(CultureInfo.InvariantCulture, "<!--{0}-->", Guid.NewGuid()); destinationMarkupServices.InsertHtml(endMarker, destinationRange.End); endComment = destinationRange.End.Left(false).Element; try { // Copy over the entire destination document into the fake destination document. MarkupRange destinationAll = SelectAll(destinationDocument); destinationMarkupServices.Copy(destinationAll.Start, destinationAll.End, temporaryDestinationPointer); // Find the original destination range in this copy. MarkupRange temporaryDestinationRange = FindMarkedFragment(temporaryDestinationContainer.Document, startMarker, endMarker); if (temporaryDestinationRange != null) { // Do the work to keep the source formatting. MarkupRange inlinedRange = new KeepSourceFormatting(sourceRange, temporaryDestinationRange).Execute(); if (inlinedRange != null) { return(inlinedRange.HtmlText); } } } finally { // WinLive 249077: Clear the temporary destination container, otherwise behaviors may // inadvertently attach to elements in the MarkupContainer. temporaryDestinationContainer.Document.body.innerHTML = String.Empty; } } catch (Exception e) { // I really dont want some funky html on the clipboard that causes a problem with this code // to prevent a paste from going through. Trace.Fail("Failed to get inline css for selection: " + e); } finally { Debug.Assert(startComment is IHTMLCommentElement, "Didn't find start comment or it wasn't created."); if (startComment is IHTMLCommentElement) { HTMLElementHelper.RemoveElement(startComment); } Debug.Assert(endComment is IHTMLCommentElement, "Didn't find end comment or it wasn't created."); if (endComment is IHTMLCommentElement) { HTMLElementHelper.RemoveElement(endComment); } } return(null); }