/// <summary>
/// Determines the value of the command
/// </summary>
private object QueryCommandRange(mshtmlTextRange range, string command)
{
object retValue = null;
if (range != null)
{
try
{
// ensure command is a valid command and then enabled for the selection
if (range.queryCommandSupported(command))
{
if (range.queryCommandEnabled(command))
{
retValue = range.queryCommandValue(command);
}
}
}
catch (Exception)
{
// have unknown error so set return to null
retValue = null;
}
}
// return the obtained value
return retValue;
}
/// <summary>
/// Executes the queryCommandState on the selected range (given the range)
/// </summary>
private bool ExecuteCommandQuery(mshtmlTextRange range, string command)
{
// set the initial state as false
bool retValue = false;
try
{
if (range != null)
{
// ensure command is a valid command and then enabled for the selection
if (range.queryCommandSupported(command))
{
if (range.queryCommandEnabled(command))
{
// mark the selection with the appropriate tag
retValue = range.queryCommandState(command);
}
}
}
}
catch (Exception ex)
{
// Unknown error so inform user
throw new HtmlEditorException("Unknown MSHTML Error.", command, ex);
}
// return the value
return retValue;
}
/// <summary>
/// Executes the execCommand on the selected range (given the range)
/// </summary>
private void ExecuteCommandRange(mshtmlTextRange range, string command, object data)
{
try
{
if (range != null)
{
// ensure command is a valid command and then enabled for the selection
if (range.queryCommandSupported(command))
{
if (range.queryCommandEnabled(command))
{
// mark the selection with the appropriate tag
range.execCommand(command, false, data);
}
}
}
}
catch (Exception ex)
{
// Unknown error so inform user
throw new HtmlEditorException("Unknown MSHTML Error.", command, ex);
}
}
} // QueryCommandRange
/// <summary>
/// Determines the value of the command
/// </summary>
private object QueryCommandRange(mshtmlTextRange range, string command)
{
object retValue = null;
try
{
if (!range.IsNull() && !range.text.IsNullOrEmpty())
{
// ensure command is a valid command and then enabled for the selection
if (range.queryCommandSupported(command))
{
if (range.queryCommandEnabled(command))
{
retValue = range.queryCommandValue(command);
}
}
}
else
{
retValue = QueryCommandDocument(command);
}
}
catch (Exception)
{
// have unknown error so set return to null
retValue = null;
}
// return the obtained value
return retValue;
} //QueryCommandRange
