/// <summary>
/// Synchronizes the selection state held in this object with the selection state in MSHTML
/// </summary>
/// <returns>true if the selection has changed</returns>
public bool SynchronizeSelection()
{
//Get the selection object from the MSHTML document
if (_document == null)
{
_document = _editor.MSHTMLDocument;
}
Interop.IHTMLSelectionObject selectionObj = _document.GetSelection();
//Get the current selection from that selection object
object currentSelection = null;
try
{
currentSelection = selectionObj.CreateRange();
}
catch
{
}
ArrayList oldItems = _items;
HtmlSelectionType oldType = _type;
int oldLength = _selectionLength;
//Default to an empty selection
_type = HtmlSelectionType.Empty;
_selectionLength = 0;
if (currentSelection != null)
{
_mshtmlSelection = currentSelection;
_items = new ArrayList();
//If it's a text selection
if (currentSelection is Interop.IHTMLTxtRange)
{
Interop.IHTMLTxtRange textRange = (Interop.IHTMLTxtRange)currentSelection;
//IntPtr ptr = Marshal.GetIUnknownForObject(textRange);
Interop.IHTMLElement parentElement = textRange.ParentElement();
// If the document is in full document mode or we're selecting a non-body tag, allow it to select
// otherwise, leave the selection as empty (since we don't want the body tag to be selectable on an ASP.NET
// User Control
if (IsSelectableElement(Element.GetWrapperFor(parentElement, _editor)))
{
//Add the parent of the text selection
if (parentElement != null)
{
_text = textRange.GetText();
if (_text != null)
{
_selectionLength = _text.Length;
}
else
{
_selectionLength = 0;
}
_type = HtmlSelectionType.TextSelection;
_items.Add(parentElement);
}
}
}
//If it's a control selection
else if (currentSelection is Interop.IHtmlControlRange)
{
Interop.IHtmlControlRange controlRange = (Interop.IHtmlControlRange)currentSelection;
int selectedCount = controlRange.GetLength();
//Add all elements selected
if (selectedCount > 0)
{
_type = HtmlSelectionType.ElementSelection;
for (int i = 0; i < selectedCount; i++)
{
Interop.IHTMLElement currentElement = controlRange.Item(i);
_items.Add(currentElement);
}
_selectionLength = selectedCount;
}
}
}
_sameParentValid = false;
bool selectionChanged = false;
//Now check if there was a change of selection
//If the two selections have different lengths, then the selection has changed
if (_type != oldType)
{
selectionChanged = true;
}
else if (_selectionLength != oldLength)
{
selectionChanged = true;
}
else
{
if (_items != null)
{
//If the two selections have a different element, then the selection has changed
for (int i = 0; i < _items.Count; i++)
{
if (_items[i] != oldItems[i])
{
selectionChanged = true;
break;
}
}
}
}
if (selectionChanged)
{
//Set _elements to null so no one can retrieve a dirty copy of the selection element wrappers
_elements = null;
OnSelectionChanged();
return(true);
}
return(false);
}