table remove

Question 1:
table data

page1--->page2 implement:
page1:
beginRemoveRows(parent, 0, size - 1)
--model data delete c++ code
endRemoveRows().

page2:
beginRemoveRows(parent, 0, size - 1)
--model data delete c++ code
endRemoveRows().
beginInsertRows(parent, 0, count -1)
--model data insert c++ code
endInsertRows().

can you tell me the qml side's executed result
page1's count?
page1's currentRow?
PS:C++ side's rowCount() function return 0 when page1's removal done.

Question 2:
how to use the function removeRows()?
must C++ side's implement it?