Problème d'architecture : double vue table/arbre

Bonjour à tous,

J'ai commencé à étudier PyQt depuis peu et je suis impressioné par les possibilités annoncées. J'ai trouvé un code intéressant ici http://www.shadoware.org/post/2009/0...C3%A9rarchique ([Qt] Transformation d'une vue tableau en une vue hiérarchique) car il correspond exactement au problème que je cherche à résoudre. Je l'ai traduit pour PyQt et j'ai ajouté un cadre général avec une vue table sur le modèle standard QSqlTableModel.

Pour espérer une synchronisation de la deuxième vue avec la vue table, il faut calculer les index de celle-ci en utilisant des requêtes QSqlQuery. L'écriture de la classe CategoryItemModel(QAbstractProxyModel) m'a montré que ce design est mauvais, car pour convertir un QModelIndex de l'arbre en QModelIndex de la table, il faut retrouver le numéro de ligne dans la table, ce qui est difficile en utilisant QSQLITE. Mais cela n'empêche pas de continuer puisque c'est du code expérimental.

Questions:

1) Y a-t-il une erreur (p.ex. choix des méthodes implémantées) dans le code ci-après qui empêche une synchronisation des deux vues ?

2) En activant les deux lignes après "test to connect selectionModel", j'obtiens le message suivant: QAbstractItemView::setSelectionModel() failed: Trying to set a selection model, which works on a different model than the view.

- Pourquoi Qt n'utilise-t-il pas les méthodes mapFromSource(), mapToSource() pour synchroniser les deux vues (en cliquant sur la dernière entrée de l'arbre je pensais que la dernière ligne de la table s'afficherait)

3) Peut-on conclure que l'emploi de QAbstractProxyModel n'apporte aucun avantage ? J'envisage une structure Python pour stocker les données sous leurs deux aspects et gérer les accès SQL, puis deux modèles distincts (un par vue). Qu'en pensez-vous ?

Merci d'avance pour vos avis.

Code:

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# -*- coding: latin1 -*- # # - contient un accès à un modèle base de donnée sous forme de QSqlTableModel, vu par QTableView # et un deuxième CategoryItemModel(QAbstractProxyModel) vu par QTreeView # utilise directement SQL (via un groupe de QSqlQuery) # # - WARN : ne tourne que sous Python 2.7.1 et PyQt v4.8.3 #   import sys   from PyQt4.QtCore import * from PyQt4.QtGui import * from PyQt4.QtSql import *   ID = 0 ID_PARENT = 1 NAME = 2   import logging logging.basicConfig(level=logging.DEBUG, format="%(asctime)s [%(levelname)s]: %(message)s", datefmt="%Y.%m.%d/%H:%M:%S", filename='zz-sql2-test.log', filemode='a') console = logging.StreamHandler() # console.setLevel(logging.DEBUG) console.setLevel(logging.WARN) # add the handler to the root logger logging.getLogger('').addHandler(console)     # -- -- -- -- -- -- -- -- -- # -- A central object to locate a node within the tree -- -- # -- -- -- -- -- -- -- -- --   class Mapping(QObject): def __init__(self, owner, id, childPos, parentId, name, inTable=False): """ An object to store information about a node: id = it's logical id parentId = id-logique du noeud parent de la ligne key name = the name value (only for debug) inTable = say if childPos concern the TableView (or the Tree !)         """ super(Mapping, self).__init__(owner) self.owner = owner # -- never used ? But necessary for PyQt QObject ! -- self.id = id self.childPos = childPos # -- the position of id in its parent -- self.parentId = parentId # -- the parentId of this id self.name = name # -- the name of this id self.inTable = inTable # -- a flag to say if childPos is relative to the Table   def __repr__(self): return "Mapping(%d,%d,%d,%s,%s)" % (self.id, self.childPos, self.parentId, self.name, self.inTable)   def isValid(self): # -- for strange situation -- A shadow object may exists, without attributes ~ -- return hasattr(self, 'id')     # -- -- -- -- -- -- -- -- --   class CategoryItemModel(QAbstractProxyModel): def __init__(self, db, parent): super(CategoryItemModel, self).__init__(parent) self.m_db = db self.parent = parent   def select(self): # -- Prepare some queries: -- self.query_children_count = QSqlQuery( self.m_db ) self.query_children_count.prepare( "SELECT count(*) FROM subjects WHERE parent_id = :pid") self.query_children_id = QSqlQuery( self.m_db ) self.query_children_id.prepare( "SELECT id, parent_id, name FROM subjects " "WHERE parent_id = :pid ORDER BY id") self.query_parent_id = QSqlQuery( self.m_db ) self.query_parent_id.prepare( "SELECT parent_id, name FROM subjects WHERE id = :chid" ) # -- @UPD@ this is only for the DEMONSTRATION ; very BAD design ! -- self.query_element_ix = QSqlQuery( self.m_db ) self.query_element_ix.prepare( "SELECT id, parent_id, name FROM subjects ORDER BY id")   # -- Prepare a root element, to use model.createIndex(row, col, XXX) to access source info -- model = self.sourceModel() self.rootIx = model.createIndex(-1,-1,None) # -- always used to access data in rootModel -- # -- Reset the layout self.reset() logging.info('%s.select(): end of reset()' % (self.__class__.__name__))     def _get_children_count_(self, pid): # -- query about number of children for a parentid ; used with row_count() -- self.query_children_count.bindValue(":pid", pid) self.query_children_count.exec_() self.query_children_count.next() if self.query_children_count.isValid(): children_count, fg_OK = self.query_children_count.value(0).toInt() else: children_count = 0 logging.debug("_get_children_count_(%d) -> %d", pid, children_count) return children_count     def _get_child_data_(self, chpos, pid): # -- use SQL to found the child data from its parentId and its relative row -- # -- very BAD DESIGN, but allow test of it ! -- self.query_children_id.bindValue(":pid", pid) self.query_children_id.exec_() xch = 0 qname = None while self.query_children_id.next(): if xch == chpos: qid, fg_OK = self.query_children_id.value(0).toInt() # -- qpid, fg_OK = self.query_children_id.value(1).toInt() qname = self.query_children_id.value(2).toString() break xch += 1 if qname is None: qid = -1 xch = -1 qname = "[???]" rval = Mapping(self, qid, xch, pid, qname, False) logging.debug("_get_child_data_(%d, %d) -> %s", chpos, pid, repr(rval)) return rval     def _get_child_row_(self, id): # -- use SQL to found the parent and its relative row -- parentId = self._get_parent_row_(id) if parentId < 0: logging.debug("_get_child_row_(%d) -> None (because pid=%d)", id, parentId) return None   self.query_children_id.bindValue(":pid", parentId) self.query_children_id.exec_() xelm = 0 qname = None while self.query_children_id.next(): qid, fg_OK = self.query_children_id.value(0).toInt() # qname = self.query_children_id.value(2).toString() # ldebug.append((qid, qname)) if qid == id: qname = self.query_children_id.value(2).toString() break xelm += 1 if qname is None: qid = -1 qname = "[???]" rval = Mapping(self, qid, xelm, parentId, qname, False) logging.debug("_get_child_row_(%d) -> %s", id, repr(rval)) return rval     def _get_parent_row_(self, id): # -- use SQL to found the parent of child-id == id -- self.query_parent_id.bindValue(":chid", id) self.query_parent_id.exec_() if self.query_parent_id.lastError().isValid(): logging.warn("_get_parent_row_ has last error: %s" % (self.query_parent_id.lastError())) if self.query_parent_id.next(): parentId, fg_OK = self.query_parent_id.value(0).toInt() parentName = self.query_parent_id.value(1).toString() else: parentId = -2 return parentId     def _get_table_row_(self, id): # -- use SQL to found the relative row to the full table -- # -- WARN : unefficient way !! -- self.query_element_ix.exec_() if self.query_element_ix.lastError().isValid(): print "DUMP: query_element_ix has last error: %s" % (self.query_element_ix.lastError())   xelm = 0 qname = None while self.query_element_ix.next(): qid, fg_OK = self.query_element_ix.value(0).toInt() qname = self.query_element_ix.value(2).toString() if qid == id: qparentId, fg_OK = self.query_element_ix.value(1).toInt() break xelm += 1 qname = None if qname is None: qid = -1 qname = "[???]" rval = Mapping(self, qid, xelm, qparentId, qname, True) logging.debug("_get_table_row_(%d) -> %s", id, repr(rval)) return rval     def flags(self, index): defaultFlags = QAbstractItemModel.flags(self, index) if index.isValid(): return Qt.ItemIsEditable | defaultFlags else: return defaultFlags     def proxyColumnToSource(self, proxyColumn): if proxyColumn == 0: return NAME return -1     def sourceColumnToProxy(self, sourceColumn): if sourceColumn == NAME: return 0 return -1     # -- For the given source index, this method return the corresponding index in the proxy def mapFromSource(self, sourceIndex): """from a sourceIndex, search the correspondant proxyIndex ; Only map the column NAME""" if not sourceIndex.isValid(): return QModelIndex()   proxyColumn = self.sourceColumnToProxy( sourceIndex.column() ) if proxyColumn == -1: return QModelIndex()   model = self.sourceModel() sixRow = sourceIndex.row() # -- create another SourceIndex to found the relevant rec.id -- sixId = sourceIndex.sibling(sixRow, 0) id, fg = sixId.data().toInt() logging.info("mapFromSource(%d,%d,...) id=%d", sourceIndex.row(), sourceIndex.column(), id)   # -- to calculate the row, use SQL ? -- map = self._get_child_row_(id) if map is None: logging.info("mapFromSource(%d,%d,...) deduce None (id=%d)", sourceIndex.row(), sourceIndex.column(), id) return QModelIndex() else: logging.info("mapFromSource(%d,%d,...) deduce (from id=%d) %s", sourceIndex.row(), sourceIndex.column(), repr(map), id) return self.createIndex(map.childPos, 0, map)     def mapToSource(self, proxyIndex): if not proxyIndex.isValid(): return QModelIndex()   sourceColumn = self.proxyColumnToSource( proxyIndex.column() ) if sourceColumn == -1: return QModelIndex()   model = self.sourceModel() pmap = proxyIndex.internalPointer()   if not pmap.isValid() or pmap.id < 0: # -- return model.createIndex(-1, -1, None) logging.info("mapToSource(%s) -> source - index %d, %d", self._repr_index_(proxyIndex), tmap.childPos, sourceColumn) return QModelIndex() else: tmap = self._get_table_row_(pmap.id) logging.info("mapToSource(%s) -> source - index %d, %d", self._repr_index_(proxyIndex), tmap.childPos, sourceColumn) return model.createIndex(tmap.childPos, sourceColumn, None)     def index(self, row, column, parent): if row < 0 or column < 0: logging.info("index(%d, %d, ...) -> empty index", row, columns) return QModelIndex()   parentMap = parent.internalPointer() if parentMap is None: parentId = 0 else: parentId = parentMap.id proxy_map = self._get_child_data_(row, parentId) logging.info("index(%d, %d, %s) deduce %s", row, column, self._repr_index_(parent), repr(proxy_map)) return self.createIndex(row, column, proxy_map)     def parent(self, index): if not index.isValid(): return QModelIndex()   currentMap = index.internalPointer() pid = currentMap.parentId if pid < 0: logging.info("parent(%s) -> invalid QModelIndex (because %s)", self._repr_index_(parent), repr(currentMap)) return QModelIndex()   map = self._get_child_row_(pid) if map is None: logging.info("parent(%s) deduce empty index", self._repr_index_(index)) return QModelIndex() else: logging.info("parent(%s) deduce %s", self._repr_index_(index), repr(map)) return self.createIndex(map.childPos, 0, map)     def hasChildren(self, index): if not index.isValid(): parentId = 0 else: parentMap = index.internalPointer() parentId = parentMap.id   rowCount = self._get_children_count_(parentId) logging.info("hasChildren(%s) count %s rows", self._repr_index_(index), rowCount) return rowCount > 0     def rowCount(self, index): if not index.isValid(): parentId = 0 else: parentMap = index.internalPointer() parentId = parentMap.id   rowCount = self._get_children_count_(parentId) logging.info("rowCount(%s) -> %s", self._repr_index_(index), rowCount) return rowCount     def columnCount(self, index): return 1     def data(self, index, role=Qt.EditRole): if not index.isValid(): return QVariant()   if role == Qt.DecorationRole: return QVariant() if role == Qt.TextAlignmentRole: return QVariant(int(Qt.AlignTop | Qt.AlignLeft)) if role != Qt.DisplayRole and role != Qt.EditRole: return QVariant()   if index.column() != 0: # -- only column 0 is valid ! -- return QVariant()   # map = index.internalPointer() # logging.info("data(%s) -> %r" % (self._repr_index_(index), map.name)) # return QVariant(QString(map.name)) # -- Problem: if table updated, map isn't ! # -- Then use the underlying model: -- model = self.sourceModel() sourceIndex = self.mapToSource( index ) return model.data(sourceIndex)   def _repr_index_(self, index): m = index.internalPointer() return "index(%d, %d, %s)" % (index.row(), index.column(), repr(m))   # -- ---------------------------------- -- # -- création de la vue et du conteneur -- # -- ---------------------------------- -- class MyWindow(QWidget): def __init__(self, *args): super(MyWindow, self).__init__(*args) self.setup_model() self.setup_proxy() # -- setup layout -- layout = QVBoxLayout(self) layout.addWidget(self.tableView) layout.addWidget(self.proxyView) self.setLayout(layout)     def setup_model(self): # -- setup the main Table model and View -- # -- def a Sql model: self.model = QSqlTableModel(self) self.model.setTable("subjects") self.model.setEditStrategy(QSqlTableModel.OnManualSubmit) # -- self.model.setHeaderData(ID, Qt.Horizontal, "Id") self.model.setHeaderData(ID_PARENT, Qt.Horizontal, "Id Parent") self.model.setHeaderData(NAME, Qt.Horizontal, "Name") # -- self.model.setSort(ID, Qt.AscendingOrder) # -- to keep coherence with proxy -- self.model.select() # -- self.tableView = QTableView(self) self.tableView.setModel(self.model)     def setup_proxy(self): # -- def a proxy model: -- m_db = self.model.database() self.modelTree = CategoryItemModel(m_db, self) self.modelTree.setSourceModel( self.model ) self.modelTree.select() # -- self.test_proxy_model() # -- self.proxyView = QTreeView(self) self.proxyView.setObjectName("treeView") # self.proxyView.setRootIsDecorated(False) self.proxyView.setAlternatingRowColors(True) self.proxyView.setModel(self.modelTree) self.proxyView.setSelectionMode(QAbstractItemView.SingleSelection)   # -- test to connect selectionModel: -- # self.selectionModel = self.tableView.selectionModel() # self.proxyView.setSelectionModel(self.selectionModel)     def test_proxy_model(self): # -- test mecanism of index / rowCount -- def show_children(index, depth=0): data = model.data(index) print "%s %s" % (' '*(2*depth), unicode(data.toString())) crow = model.rowCount(index) for xrow in range(crow): chix = model.index(xrow, 0, index) show_children(chix, depth+1) # -- print "Start of test_proxy_model()" model = self.modelTree rootix = model.createIndex(-1,-1,None) show_children(rootix) print "End of test_proxy_model()"     def createConnection(): db = QSqlDatabase.addDatabase("QSQLITE") db.setDatabaseName('base.sqlite') if not db.open(): QtGui.QMessageBox.critical(None, QtGui.qApp.tr("Cannot open database"), QtGui.qApp.tr("Unable to establish a database connection to SQLite.\n" "Click Cancel to exit."), QtGui.QMessageBox.Cancel) return False query = QSqlQuery() fg_tab_ok = True fg_complete = False fg_complete_v2 = False fg_remove = False try: vv = query.exec_("select count(*) from subjects") if vv: query.next() if query.isValid(): val, fg_OK = query.value(0).toInt() # -- QVariant -- else: logging.error("Invalid query or result! ") val = 0 else: fg_tab_ok = False val = 0 if val == 0: fg_complete = True if val == 9: fg_complete_v2 = True if val == 999: fg_remove = True except Exception, iExc: fg_tab_ok = False print "raise exception %s: %s" % (iExc.__class__.__name__, str(iExc)) if not fg_tab_ok: print "Create the table:" query.exec_("create table subjects(id int primary key, " "parent_id int, name varchar(40))") fg_complete = True if fg_complete: query.exec_("insert into subjects values(1, 0, 'Categories')") query.exec_("insert into subjects values(3, 1, 'Webservices')") query.exec_("insert into subjects values(4, 1, 'Stylesheet')") query.exec_("insert into subjects values(7, 1, 'Buttons Widgets')") query.exec_("insert into subjects values(10, 7, 'Test2')") query.exec_("insert into subjects values(11, 7, 'Test3')") query.exec_("insert into subjects values(21, 0, 'Variants')") query.exec_("insert into subjects values(31, 21, 'Layout')") query.exec_("insert into subjects values(32, 21, 'Shortcut')") query.exec_("insert into subjects values(33, 31, 'H-Split')") query.exec_("insert into subjects values(36, 32, 'Copy')") query.exec_("insert into subjects values(37, 32, 'Paste')") query.exec_("commit") if fg_complete_v2: print "Complete (bis) the table with a root:" query.exec_("insert into subjects values(34, 31, 'V-Split')") query.exec_("commit") if fg_remove: print "Remove invalid row from table:" query.exec_("delete from subjects where id = 0") query.exec_("commit") return True   #=============================================================================== if __name__ == '__main__': import sys app = QApplication(sys.argv) if not createConnection(): sys.exit(1)   window = MyWindow() window.show() sys.exit(app.exec_())

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Bonjour à tous,

Désolé d'encombrer ce forum, mais comme j'ai souvent profité des bouts de codes dénichés ici, je poste une nouvelle version du programme mettant en oeuvre la deuxième hypothèse exposée précédemment.

Ce code est perfectible, mais il fonctionne comme je le souhaite avec une synchronisation raisonnable des deux vues.

Toute suggestion d'amélioration (ou de simplification de code) est la bienvenue. :D

Code:

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# -*- coding: latin1 -*- # # - stocke les données dans une structure Python (DataStore) qui fait le lien entre les # deux modèles SpecTableModel(QAbstractTableModel) et SpecTreeModel(QAbstractItemModel) # La mise à jour des cellules et le déplacement sont synchronisés. # # - WARN : tourne sous Python 2.7.1 et PyQt v4.8.3 #   import sys   from PyQt4.QtCore import * from PyQt4.QtGui import * from PyQt4.QtSql import *   ID = 0 ID_PARENT = 1 NAME = 2     # -- -- -- -- -- -- -- -- -- # -- Objects to store data and allow cross-link -- -- # -- -- -- -- -- -- -- -- --   class DataRow(object): def __init__(self, id, parentId, name): """ An object to store information a Row of data """ super(DataRow, self).__init__() self.id = id self.parentId = parentId # -- the parentId of this id self.name = name # -- the name of this id self.treeNode = None   def setTreeRef(self, treeNode): self.treeNode = treeNode   def getValue(self, col): if col == 0: value = str(self.id) elif col == 1: value = str(self.parentId) elif col == 2: value = self.name else: value = None return value   def setValue(self, col, value): fg_setup_ok = True if col == 0: self.id = int(value) elif col == 1: self.parentId = int(value) elif col == 2: self.name = value else: fg_setup_ok = False return fg_setup_ok   def __repr__(self): return "DataRow(%d,%d,%s)" % (self.id, self.parentId, self.name)     class DataNode(QObject): def __init__(self, parent, id, row): """ An object to store a node of the tree """ super(DataNode, self).__init__(parent) self.parent = parent self.id = id # -- only for debug -- self.row = row self.children = []   def __repr__(self): return "DataNode(%d,%s) [*%d]" % (self.id, repr(self.row), len(self.children))   def addChild(self, child): self.children.append(child)   def getSize(self): return len(self.children)   def getWidth(self): return 1   def getParent(self): return self.parent   def getPos(self): # -- search pos of self in its parent ! -- pos = self.parent.children.index(self) return pos   def getChild(self, row): if row < 0 or row >= len(self.children): return None else: return self.children[row]   def getValue(self, col): if col == 0: value = self.row.name else: value = None return value   def setValue(self, col, value): fg_setup_ok = True if col == 0: self.row.name = value else: fg_setup_ok = False return fg_setup_ok     class DataStore(QObject): """ An object to store all data in the two forms: DataRow and DataNode """   dataChanged = pyqtSignal(DataNode) cursorChanged = pyqtSignal(DataNode)   def __init__(self, parent, db): super(DataStore, self).__init__(parent) self.parent = parent self.db = db self.rows = [] hiddenRow = DataRow(0, -1, "[root]") self.root = DataNode(None, 0, hiddenRow) self.indexRowById = {0 : (hiddenRow, [])} # -- for each id, store the row and [childId] self._setup_queries_()   def connect_data_view(self): # -- to be call after setup of views -- self.connect(self.parent.tableView.selectionModel(), SIGNAL("currentChanged(QModelIndex,QModelIndex)"), self.currentTableCursorChanged) self.connect(self.parent.treeView.selectionModel(), SIGNAL("currentChanged(QModelIndex,QModelIndex)"), self.currentTreeCursorChanged)   def __len__(self): return len(self.rows)     def _setup_queries_(self): self.query_all = QSqlQuery( self.db ) self.query_all.prepare( "SELECT id, parent_id, name FROM subjects " ) self.upd_row = QSqlQuery( self.db ) self.upd_row.prepare( "UPDATE subjects SET parent_id = :pid, name = :name WHERE id = :id " )     def select(self): """ Standard to setup data """ # -- define a reccursive function to fill the tree -- def fillNode(dataNode): for chid in self.indexRowById[dataNode.id][1]: childRow = self.indexRowById[chid][0] childNode = DataNode(dataNode, chid, childRow) childRow.setTreeRef(childNode) dataNode.addChild(childNode) fillNode(childNode) # -- first collect all data and store DataRow in self.rows -- # -- also fill self.indexRowById() (but without children !) self.query_all.exec_() while self.query_all.next(): qid, fg_OK = self.query_all.value(0).toInt() qpid, fg_OK = self.query_all.value(1).toInt() qname = self.query_all.value(2).toString() row = DataRow(qid, qpid, qname) self.rows.append(row) self.indexRowById[qid] = (row, []) # -- then complete self.indexRowById -- for row in self.rows: pid = row.parentId idIndex = self.indexRowById.get(pid) if idIndex is not None: idIndex[1].append(row.id) # -- then fillNode(self.root)   def dump_tree(self): # -- test mecanism of fillNode() -- def show_children(node, depth=0): data = model.data(index) print "%s %s" % (' '*(2*depth), unicode(data.toString())) crow = model.rowCount(index) for xrow in range(crow): chix = model.index(xrow, 0, index) show_children(chix, depth+1) # -- print "Start of test_proxy_model()" model = self.modelTree rootix = model.createIndex(-1,-1,None) show_children(rootix) print "End of test_proxy_model()"   def getTableHeader(self, section): if section == 0: head = "Id" elif section == 1: head = "Parent Id" elif section == 2: head = "Name" else: head = "???" return head   def isTableEditable(self, col): if col == 0: return False else: return True   def getTableValue(self, row, col): if row < 0 or row >= len(self.rows): return None else: return self.rows[row].getValue(col)   def setTableValue(self, row, col, value): if row < 0 or row >= len(self.rows): return False else: currentRow = self.rows[row] fg_OK = currentRow.setValue(col, value) if fg_OK: self._upd_db_(currentRow) currentNode = currentRow.treeNode self.dataChanged.emit(currentNode) # -- the node ! -- return fg_OK   def getTreeHeader(self, section): if section == 0: head = "Name" else: head = "???" return head   def isTreeEditable(self, col): if col != 0: return False else: return True   def setTreeValue(self, node, col, value): if col != 0: return False else: row = node.row fg_OK = row.setValue(2, value) if fg_OK: self._upd_db_(row) self.dataChanged.emit(node) # -- the node ?? -- return fg_OK   def _upd_db_(self, row): self.upd_row.bindValue(":id", row.id) self.upd_row.bindValue(":pid", row.parentId) self.upd_row.bindValue(":name", row.name) self.upd_row.exec_()     def tablePosFromNode(self, node): row = node.row pos = self.rows.index(row) return pos   def currentTableCursorChanged(self, indexCurrent, indexPrevious): # -- these are tableIndex ! -- currentRow = self.rows[indexCurrent.row()] self.cursorChanged.emit(currentRow.treeNode) # -- the node ! --   def currentTreeCursorChanged(self, indexCurrent, indexPrevious): # -- these are treeIndex ! -- r_current = repr(indexCurrent.internalPointer()) r_previous = repr(indexPrevious.internalPointer()) currentNode = indexCurrent.internalPointer() self.cursorChanged.emit(currentNode)     # -- -- -- -- -- -- -- -- --   class SpecTableModel(QAbstractTableModel): def __init__(self, parent, data): super(QAbstractTableModel, self).__init__(parent) self.parent = parent self.dataStore = data fg_OK = self.dataStore.dataChanged.connect(self.change)   def headerData(self, section, orientation, role): if orientation == Qt.Horizontal and role == Qt.DisplayRole: return QVariant(self.dataStore.getTableHeader(section)) return QVariant()   def rowCount(self, index): rowCount = len(self.dataStore) return rowCount   def columnCount(self, index): colCount = 3 return colCount   def flags(self, index): defaultFlags = QAbstractItemModel.flags(self, index) if index.isValid() and self.dataStore.isTableEditable(index.column()): return Qt.ItemIsEditable | defaultFlags else: return defaultFlags   def data(self, index, role=Qt.EditRole): if not index.isValid(): return QVariant()   if role == Qt.DecorationRole: return QVariant() if role == Qt.TextAlignmentRole: return QVariant(int(Qt.AlignTop | Qt.AlignLeft)) if role != Qt.DisplayRole and role != Qt.EditRole: return QVariant()   value = self.dataStore.getTableValue(index.row(), index.column()) if value is None: return QVariant() else: return QVariant(QString(value))   def setData(self, index, value, role=Qt.EditRole): """Sets the data.""" if not index.isValid(): return False if role != Qt.EditRole: return False fg_OK = self.dataStore.setTableValue(index.row(), index.column(), unicode(value.toString())) return fg_OK   def change(self, dataNode): pos = self.dataStore.tablePosFromNode(dataNode) dataIndex = self.createIndex(pos, 2, None) self.emit(SIGNAL("dataChanged(QModelIndex,QModelIndex)"), dataIndex, dataIndex)     # -- -- -- -- -- -- -- -- --   class SpecTreeModel(QAbstractItemModel):   def __init__(self, parent, data): super(QAbstractItemModel, self).__init__(parent) self.parent = parent self.dataStore = data fg_OK = self.dataStore.dataChanged.connect(self.change)   def headerData(self, section, orientation, role): if orientation == Qt.Horizontal and role == Qt.DisplayRole: return QVariant(self.dataStore.getTreeHeader(section)) return QVariant()   def rowCount(self, parent): if parent.column() > 0: return 0; if not parent.isValid(): parentNode = self.dataStore.root else: parentNode = parent.internalPointer() return parentNode.getSize()   def columnCount(self, parent): if not parent.isValid(): parentNode = self.dataStore.root else: parentNode = parent.internalPointer() return parentNode.getWidth()   def flags(self, index): defaultFlags = QAbstractItemModel.flags(self, index) if index.isValid() and self.dataStore.isTreeEditable(index.column()): return Qt.ItemIsEditable | defaultFlags else: return defaultFlags   def index(self, row, column, parent): if row < 0 or column < 0: return QModelIndex()   parentNode = parent.internalPointer() if parentNode is None: parentNode = self.dataStore.root node = parentNode.getChild(row) if node is None: return QModelIndex() else: return self.createIndex(row, column, node)   def parent(self, index): if not index.isValid(): return QModelIndex()   currentNode = index.internalPointer() parentNode = currentNode.getParent() if parentNode == self.dataStore.root: return QModelIndex() else: return self.createIndex(parentNode.getPos(), 0, parentNode)   def data(self, index, role=Qt.EditRole): if not index.isValid(): return QVariant()   if role == Qt.DecorationRole: return QVariant() if role == Qt.TextAlignmentRole: return QVariant(int(Qt.AlignTop | Qt.AlignLeft)) if role != Qt.DisplayRole and role != Qt.EditRole: return QVariant()   currentNode = index.internalPointer() if currentNode is None: return QVariant() else: value = currentNode.getValue(index.column()) return QVariant(QString(value))   def setData(self, itemIndex, value, role=Qt.EditRole): """Sets the data.""" if not itemIndex.isValid(): return False if role != Qt.EditRole: return False itemNode = itemIndex.internalPointer() self.dataStore.setTreeValue(itemNode, itemIndex.column(), unicode(value.toString())) return True   def change(self, dataNode): dataIndex = self.createIndex(dataNode.getPos(), 0, dataNode) self.emit(SIGNAL("dataChanged(QModelIndex,QModelIndex)"), dataIndex, dataIndex)     # -- ----------------------------------- -- # -- création de la fenêtre et des vues -- # -- ----------------------------------- -- class MyWindow(QWidget): def __init__(self, *args): super(MyWindow, self).__init__(*args)   def setup(self, db): self.db = db self.setup_data() self.setup_table() self.setup_tree() self.data.connect_data_view() # -- setup layout -- layout = QVBoxLayout(self) layout.addWidget(self.tableView) layout.addWidget(self.treeView) self.setLayout(layout)   def setup_data(self): self.data = DataStore(self, self.db) self.data.select()   def setup_table(self): # -- setup the main Table model and View -- # -- def a Sql model: self.tableModel = SpecTableModel(self, self.data) # -- self.tableView = QTableView(self) self.tableView.setModel(self.tableModel) self.tableView.setAutoScroll(True)   def setup_tree(self): self.treeModel = SpecTreeModel(self, self.data) # -- self.treeView = QTreeView(self) self.treeView.setObjectName("treeView") self.treeView.setAlternatingRowColors(True) self.treeView.setModel(self.treeModel) self.treeView.setSelectionMode(QAbstractItemView.SingleSelection) # -- self.test_tree_model() self.data.cursorChanged.connect(self.moveCursor)     def moveCursor(self, dataNode): # -- pos = self.data.tablePosFromNode(dataNode) dataIndex = self.tableView.model().createIndex(pos, 2, None) self.tableView.setCurrentIndex(dataIndex) # -- dataIndex = self.treeView.model().createIndex(dataNode.getPos(), 0, dataNode) self.treeView.setCurrentIndex(dataIndex)     def test_tree_model(self): # -- test mecanism of index / rowCount -- def show_children(index, depth=0): data = model.data(index) print "%s %s" % (' '*(2*depth), unicode(data.toString())) crow = model.rowCount(index) for xrow in range(crow): chix = model.index(xrow, 0, index) show_children(chix, depth+1) # -- print "Start of test_tree_model()" model = self.treeModel rootix = model.createIndex(-1,-1,None) show_children(rootix) print "End of test_tree_model()"     def createConnection(): db = QSqlDatabase.addDatabase("QSQLITE") db.setDatabaseName('base.sqlite') if not db.open(): QtGui.QMessageBox.critical(None, QtGui.qApp.tr("Cannot open database"), QtGui.qApp.tr("Unable to establish a database connection to SQLite.\n" "Click Cancel to exit."), QtGui.QMessageBox.Cancel) return None query = QSqlQuery() fg_tab_ok = True fg_complete = False fg_complete_v2 = False fg_remove = False try: vv = query.exec_("select count(*) from subjects") if vv: query.next() if query.isValid(): val, fg_OK = query.value(0).toInt() # -- QVariant -- else: val = 0 else: fg_tab_ok = False val = 0 if val == 0: fg_complete = True if val == 9: fg_complete_v2 = True if val == 999: fg_remove = True except Exception, iExc: fg_tab_ok = False print "raise exception %s: %s" % (iExc.__class__.__name__, str(iExc)) if not fg_tab_ok: print "Create the table:" query.exec_("create table subjects(id int primary key, " "parent_id int, name varchar(40))") fg_complete = True if fg_complete: query.exec_("insert into subjects values(1, 0, 'Categories')") query.exec_("insert into subjects values(3, 1, 'Webservices')") query.exec_("insert into subjects values(4, 1, 'Stylesheet')") query.exec_("insert into subjects values(7, 1, 'Buttons Widgets')") query.exec_("insert into subjects values(10, 7, 'Test2')") query.exec_("insert into subjects values(11, 7, 'Test3')") query.exec_("insert into subjects values(21, 0, 'Variants')") query.exec_("insert into subjects values(31, 21, 'Layout')") query.exec_("insert into subjects values(32, 21, 'Shortcut')") query.exec_("insert into subjects values(33, 31, 'H-Split')") query.exec_("insert into subjects values(36, 32, 'Copy')") query.exec_("insert into subjects values(37, 32, 'Paste')") query.exec_("commit") return db   #=============================================================================== if __name__ == '__main__': import sys app = QApplication(sys.argv) db = createConnection() if db is None: sys.exit(1)   window = MyWindow() window.setup(db) window.show() sys.exit(app.exec_())

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Merci pour votre compréhension,
try2Bpro

Bonjour.

Citation:

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Envoyé par try2Bpro

Désolé d'encombrer ce forum, mais comme j'ai souvent profité des bouts de codes dénichés ici, je poste une nouvelle version du programme mettant en oeuvre la deuxième hypothèse exposée précédemment.

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Bonne initiative au contraire !

Bonjour,

+1 !

J'utilise couramment les QTableView pour consulter des bases de données relationnelles SQL, et je suis intéressé par ton code qui fait des choses en plus, que je sais pas (encore) faire...

Tyrtamos