void Refresh()
{
var len = filePaths.arraySize;
workbooks = new WorkBookData[len];
for (int i = 0; i < len; i++)
{
var path = filePaths.GetArrayElementAtIndex(i).stringValue;
workbooks[i] = new WorkBookData(path);
}
datachanged = false;
}
void DrawWorkBookSwitchUI()
{
var id = EditorGUILayout.Popup(bookID, workbookTabs, style_popup, GUILayout.Height(20));
if (bookID != id)
{
sheetID = 0;
bookID = id;
book = workbooks[bookID];
SwitchSheet();
}
}