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Thread: how to change the selection of a parent QTableView from a sub QTableView

  1. 25th November 2009, 06:53 #1
    flapjack
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    Default how to change the selection of a parent QTableView from a sub QTableView

    I have a special table that's related to it's self like so
    Qt Code: 
    1. CREATE TABLE people ( 
    2. ID INTEGER PRIMARY KEY AUTOINCREMENT 
    3. , Name TEXT 
    4. , BlaBla TEXT)
    5.  
    6. CREATE TABLE children ( 
    7. parentID INTEGER 
    8. , childID INTEGER 
    9. , Whatever TEXT)
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    so I'd like to have 1 QTableView that's a master list and lists all people. I'd like a sub QTableView that will list only the children of the selected person. So far no big deal. What I can't figure out is how to make it so that when the user double clicks on a child that child becomes the new selection of the master list of all people.

    I've hacked together a quick example of what I'm talking about that works OK on my machine using python 2.6 and pyqt 4.5.3 though this should be general to all qt more or less. In the example it's the childrenClicked method that I can't figure out.

    Thanks,
    Aaron



    Qt Code: 
    1. from PyQt4.QtSql import (QSqlDatabase, QSqlQuery, QSqlTableModel,
    3. from PyQt4.QtGui import (QApplication, QMainWindow)
    4. from PyQt4 import QtCore, QtGui
    5. from PyQt4.QtCore import (QObject, SIGNAL, SLOT, QVariant, Qt)
    6. from PyQt4.QtCore import *
    7. from PyQt4.QtGui import *
    8.  
    9. class PeopleTableModel(QSqlTableModel):
    10.     def __init__(self):
    11.         QSqlTableModel.__init__(self)
    12.         self.setTable("people")
    13.  
    14.         self.setHeaderData(0, Qt.Horizontal, QVariant("ID"))
    15.         self.setHeaderData(1, Qt.Horizontal, QVariant("Name"))
    16.         self.setHeaderData(2, Qt.Horizontal, QVariant("BlaBla"))
    17.  
    18.         self.setEditStrategy(QSqlTableModel.OnFieldChange)
    19.  
    20.         self.select()
    21.  
    22. class ChildrenModel(QSqlRelationalTableModel):
    23.     def __init__(self):
    24.         QSqlRelationalTableModel.__init__(self)
    25.  
    26.         self.setTable("children")
    27.  
    28.         self.setRelation(0, QSqlRelation("people", "ID", "Name"))
    29.         self.setRelation(1, QSqlRelation("people", "ID", "Name"))
    30.         self.setHeaderData(2, Qt.Horizontal, QVariant("Whatever"))
    31.         self.select()
    32.  
    33. class aMainWindow(QMainWindow):
    34.     def __init__(self):
    35.         QMainWindow.__init__(self)
    36.  
    37.         self.setObjectName("MainWindow")
    38.         self.resize(714, 690)
    39.  
    40.         self.centralwidget = QtGui.QWidget(self)
    41.         self.centralwidget.setObjectName("centralwidget")
    42.         self.horizontalLayout = QtGui.QHBoxLayout(self.centralwidget)
    43.         self.horizontalLayout.setObjectName("horizontalLayout")
    44.  
    45.         self.peopleView = QtGui.QTableView(self)
    46.         self.peopleView.setEditTriggers(QtGui.QAbstractItemView.NoEditTriggers)
    47.         self.peopleView.setAlternatingRowColors(True)
    48.         self.peopleView.setSelectionMode(QtGui.QAbstractItemView.SingleSelection)
    49.         self.peopleView.setSelectionBehavior(QtGui.QAbstractItemView.SelectRows)
    50.         self.horizontalLayout.addWidget(self.peopleView)        
    51.         self.childrenView = QtGui.QTableView(self)
    52.         self.childrenView.setEditTriggers(QtGui.QAbstractItemView.NoEditTriggers)
    53.         self.childrenView.setAlternatingRowColors(True)
    54.         self.childrenView.setSelectionMode(QtGui.QAbstractItemView.SingleSelection)
    55.         self.childrenView.setSelectionBehavior(QtGui.QAbstractItemView.SelectRows)        
    56.         self.horizontalLayout.addWidget(self.childrenView)
    57.  
    58.         self.setCentralWidget(self.centralwidget)        
    59.  
    60.  
    61.         self.db = QSqlDatabase.addDatabase('QSQLITE')
    62.         self.db.setDatabaseName(':memory:')
    63.         self.db.open()
    64.  
    65.         #I added extra columns just to be sure to show row selection not just cell.
    66.         query = QSqlQuery(self.db)
    67.         query.prepare('CREATE TABLE people ( \
    68.                        ID INTEGER PRIMARY KEY AUTOINCREMENT \
    69.                        , Name TEXT \
    70.                        , BlaBla TEXT);')
    71.         query.exec_()        
    72.         query.prepare('CREATE TABLE children ( \
    73.                        parentID INTEGER \
    74.                        , childID INTEGER \
    75.                        , Whatever TEXT);')
    76.         query.exec_()
    77.  
    78.         query.prepare('INSERT INTO people VALUES(?, ?, ?)')
    79.         ids = [1,2,3,4,5]
    80.         names = ['Mary', 'John', 'Sam', 'Kate', 'Mark']
    81.         bla = ['hmm', 'hmm', 'hmm', 'hmm', 'hmm']
    82.  
    83.         query.addBindValue(ids)        
    84.         query.addBindValue(names)        
    85.         query.addBindValue(bla)
    86.         query.execBatch()        
    87.  
    88.         query.prepare('INSERT INTO children VALUES(?, ?, ?)')
    89.         parents = [1,1,2,2]
    90.         children = [4,5,1,3]
    91.         yada = ['hmm', 'hmm', 'hmm', 'hmm']
    92.  
    93.         query.addBindValue(parents)        
    94.         query.addBindValue(children)        
    95.         query.addBindValue(yada)
    96.         query.execBatch()
    97.  
    98.         self.peopleModel = PeopleTableModel()
    99.         self.peopleView.setModel(self.peopleModel)
    100.         self.peopleView.setColumnHidden(0, True)
    101.         self.childrenModel = ChildrenModel()
    102.         self.childrenView.setModel(self.childrenModel)
    103.         self.childrenView.setColumnHidden(0, True)        
    104.  
    105.         QObject.connect(self.peopleView.selectionModel(),
    106.                 SIGNAL("currentRowChanged(QModelIndex,QModelIndex)"),
    107.                 self.peopleChanged)
    108.  
    109.         QObject.connect(self.childrenView,
    110.                 SIGNAL("doubleClicked(QModelIndex)"),
    111.                 self.childrenClicked)
    112.  
    113.         self.childrenView.horizontalHeader().moveSection(1,0)
    114.         self.peopleChanged(self.peopleView.currentIndex())
    115.  
    116.  
    117.     def peopleChanged(self, index):
    118.         if index.isValid():
    119.             record = self.peopleModel.record(index.row())
    120.             id = record.value("ID").toInt()[0]
    121.             self.childrenModel.setFilter(QString("parentID = %1").arg(id))
    122.         else:
    123.             self.childrenModel.setFilter("parentID = -1")
    124.         #self.childrenModel.reset() # workaround for Qt <= 4.3.3/SQLite bug
    125.         self.childrenModel.select()
    126.         self.childrenView.horizontalHeader().setVisible(
    127.                 self.childrenModel.rowCount() > 0)        
    128.  
    129.     def childrenClicked(self, index):
    130.         print 'childrenClicked'
    131.         #newIndex = index.sibling(3,0)
    132.         #self.tableView.selectionModel().select(newIndex)
    133.         print index
    134.         record = self.childrenModel.record(index.row())
    135.         print record
    136.         print record.value(1).toString()
    137.  
    138.         #works but how do I get the row from the childs index?
    139.         self.peopleView.selectRow(4)
    140.  
    141.         #seems to select (look at row numbers carefully) but doesn't change children.
    142.         #self.peopleView.selectionModel().select(self.peopleModel.index(1,0), QItemSelectionModel.SelectCurrent)
    143.  
    144.  
    145. if __name__ == "__main__":
    146.     import sys
    147.     app = QApplication(sys.argv)
    148.     MainWindow = aMainWindow()
    149.  
    150.     MainWindow.show()
    151.     sys.exit(app.exec_())
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  2. 25th November 2009, 07:36 #2
    caduel
    caduel is offline Advanced user
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    Default Re: how to change the selection of a parent QTableView from a sub QTableView

    Well, unless you query the "parent's row" in the sql query (so the child record would contain the row already) you will have to search your people model for the entry selected in the children model.
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  3. 26th November 2009, 04:45 #3
    flapjack
    flapjack is offline Beginner
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    Default Re: how to change the selection of a parent QTableView from a sub QTableView

    yes exactly but I can't figure out how to do that. The children model only returns the values not the ids and even if I had the id (column value) I don't know how to get the index of a specific row from a db value. like I said I can't seem to connect the two halves in that one method.
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