public void InsertHtml(string html)
{
this.Selection.SynchronizeSelection();
if (this.Selection.Type == HtmlSelectionType.ElementSelection)
{
//If it's a control range, we can only insert if we are in a div or td
NativeMethods.IHtmlControlRange controlRange = (NativeMethods.IHtmlControlRange)Selection.Selection;
int selectedItemCount = controlRange.GetLength();
if (selectedItemCount == 1)
{
NativeMethods.IHTMLElement element = controlRange.Item(0);
if ((String.Compare(element.GetTagName(), "div", true) == 0) || (String.Compare(element.GetTagName(), "td", true) == 0))
{
element.InsertAdjacentHTML("beforeEnd", html);
}
}
}
else
{
NativeMethods.IHTMLTxtRange textRange = (NativeMethods.IHTMLTxtRange)Selection.Selection;
textRange.PasteHTML(html);
}
}
/// <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()
{
if (this.document == null)
{
this.document = this.control.HtmlDocument;
}
NativeMethods.IHTMLSelectionObject selection = this.document.GetSelection();
object currentSelection = null;
try
{
currentSelection = selection.CreateRange();
}
catch
{
}
ArrayList oldItems = this.items;
HtmlSelectionType oldType = this.type;
int oldLength = this.selectionLength;
// Default to an empty selection
this.type = HtmlSelectionType.Empty;
this.selectionLength = 0;
if (currentSelection != null)
{
this.selection = currentSelection;
this.items = new ArrayList();
//If it's a text selection
if (currentSelection is NativeMethods.IHTMLTxtRange)
{
NativeMethods.IHTMLTxtRange textRange = (NativeMethods.IHTMLTxtRange)currentSelection;
NativeMethods.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 (this.IsSelectableElement(new HtmlElement(parentElement, this.control)))
{
// Add the parent of the text selection
if (parentElement != null)
{
this.text = textRange.GetText();
if (this.text != null)
{
this.selectionLength = this.text.Length;
}
else
{
this.selectionLength = 0;
}
this.type = HtmlSelectionType.TextSelection;
this.items.Add(parentElement);
}
}
}
// If it is a control selection
else if (currentSelection is NativeMethods.IHtmlControlRange)
{
NativeMethods.IHtmlControlRange controlRange = (NativeMethods.IHtmlControlRange)currentSelection;
int selectedCount = controlRange.GetLength();
// Add all elements selected
if (selectedCount > 0)
{
this.type = HtmlSelectionType.ElementSelection;
for (int i = 0; i < selectedCount; i++)
{
NativeMethods.IHTMLElement currentElement = controlRange.Item(i);
this.items.Add(currentElement);
}
this.selectionLength = selectedCount;
}
}
}
this.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 (this.type != oldType)
{
selectionChanged = true;
}
else if (this.selectionLength != oldLength)
{
selectionChanged = true;
}
else
{
if (this.items != null)
{
//If the two selections have a different element, then the selection has changed
for (int i = 0; i < this.items.Count; i++)
{
if (this.items[i] != oldItems[i])
{
selectionChanged = true;
break;
}
}
}
}
if (selectionChanged)
{
//Set this.elements to null so no one can retrieve a dirty copy of the selection element wrappers
this.elements = null;
OnSelectionChanged(EventArgs.Empty);
return(true);
}
return(false);
}
public bool SelectElements(ICollection elements)
{
NativeMethods.IHTMLElement body = this.control.HtmlDocument.GetBody();
NativeMethods.IHTMLTextContainer container = body as NativeMethods.IHTMLTextContainer;
Debug.Assert(container != null);
object controlRange = container.createControlRange();
NativeMethods.IHtmlControlRange htmlControlRange = controlRange as NativeMethods.IHtmlControlRange;
Debug.Assert(htmlControlRange != null);
if (htmlControlRange == null)
{
return(false);
}
NativeMethods.IHtmlControlRange2 htmlControlRange2 = controlRange as NativeMethods.IHtmlControlRange2;
Debug.Assert(htmlControlRange2 != null);
if (htmlControlRange2 == null)
{
return(false);
}
int hr = 0;
foreach (object o in elements)
{
NativeMethods.IHTMLElement element = this.GetHtmlElement(o);
if (element == null)
{
return(false);
}
hr = htmlControlRange2.addElement(element);
if (hr != NativeMethods.S_OK)
{
break;
}
}
if (hr == NativeMethods.S_OK)
{
//If it succeeded, simply select the control range
htmlControlRange.Select();
}
else
{
// elements like DIV and SPAN, w/o layout, cannot be added to a control selelction.
NativeMethods.IHtmlBodyElement bodyElement = (NativeMethods.IHtmlBodyElement)body;
NativeMethods.IHTMLTxtRange textRange = bodyElement.createTextRange();
if (textRange != null)
{
foreach (object o in elements)
{
try
{
NativeMethods.IHTMLElement element = this.GetHtmlElement(o);
if (element == null)
{
return(false);
}
textRange.MoveToElementText(element);
}
catch
{
}
}
textRange.Select();
}
}
return(true);
}
