I was recently coding PyQt with a QComboBox in a QTable. The QComboBox has autocomplete on by default.
I was wanting to try and reproduce this in Python3 with Gtk3. I came across this example:
Gtk.Entry in Gtk.TreeView (CellRenderer)
that seems to have successfully added an autocompletion to a ComboBox in a Treeview. The example is not complete and I was hoping someone could give me a complete working example. I don't know how I 'connect' the CellRendererAutoComplete class to one of the columns in a treeview.
What I really want is to have AutoCompletion in an editable TreeView cell (with or without a ComboBox), but I have never come across this in the past in Gtk.
Thank you.
Here is a code example:
# https://stackoverflow.com/questions/13756787/
# https://python-gtk-3-tutorial.readthedocs.io/en/latest/cellrenderers.html
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk
#######################################################################
class CellRendererAutoComplete(Gtk.CellRendererText):
""" Text entry cell which accepts a Gtk.EntryCompletion object """
__gtype_name__ = 'CellRendererAutoComplete'
def __init__(self, completion):
self.completion = completion
Gtk.CellRendererText.__init__(self)
def do_start_editing(
self, event, treeview, path, background_area, cell_area, flags):
if not self.get_property('editable'):
return
entry = Gtk.Entry()
entry.set_completion(self.completion)
entry.connect('editing-done', self.editing_done, path)
entry.show()
entry.grab_focus()
return entry
def editing_done(self, entry, path):
self.emit('edited', path, entry.get_text())
#######################################################################
class CellRendererTextWindow(Gtk.Window):
def __init__(self):
Gtk.Window.__init__(self, title="CellRendererText Example")
self.set_default_size(200, 200)
self.liststore = Gtk.ListStore(str, str)
self.liststore.append(["Fedora", "http://fedoraproject.org/"])
self.liststore.append(["Slackware", "http://www.slackware.com/"])
self.liststore.append(["Sidux", "http://sidux.com/"])
treeview = Gtk.TreeView(model=self.liststore)
renderer_text = Gtk.CellRendererText()
column_text = Gtk.TreeViewColumn("Text", renderer_text, text=0)
treeview.append_column(column_text)
renderer_editabletext = Gtk.CellRendererText()
renderer_editabletext.set_property("editable", True)
########
# This is the problem area, I suppose, but I'm not sure
x = CellRendererAutoComplete()
renderer_editabletext.connect('on_edit',x(renderer_editabletext))
########
column_editabletext = Gtk.TreeViewColumn("Editable Text",renderer_editabletext, text=1)
treeview.append_column(column_editabletext)
renderer_editabletext.connect("edited", self.text_edited)
self.add(treeview)
def text_edited(self, widget, path, text):
self.liststore[path][1] = text
win = CellRendererTextWindow()
win.connect("destroy", Gtk.main_quit)
win.show_all()
Gtk.main()
So here is an example showing a CellRendererText and a CellRendererCombo using an EntryCompletion.
Because of the complexity of the Treeview, where one ListStore can be the model behind the Completion, Combo, and Entry, and another model can be behind the Treeview, you should have a very good grasp of Gtk.Treeview to understand this example. Note that this example only uses one Liststore, and only one editable column used by both the CellRendererText and the CellRendererColumn. This makes the example confusing, but it the simplest I can come up with since I do not know the intended use for this Treeview.
#!/usr/bin/python
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk
class CellRendererTextWindow(Gtk.Window):
def __init__(self):
Gtk.Window.__init__(self, title="CellRendererText Example")
self.set_default_size(200, 200)
self.liststore = Gtk.ListStore(str, str)
self.liststore.append(["Fedora", "http://fedoraproject.org/"])
self.liststore.append(["Slackware", "http://www.slackware.com/"])
self.liststore.append(["Sidux", "http://sidux.com/"])
treeview = Gtk.TreeView(model=self.liststore)
self.completion = Gtk.EntryCompletion(model = self.liststore)
self.completion.set_text_column(1)
self.completion.connect('match-selected', self.renderer_match_selected)
renderer_text = Gtk.CellRendererText()
column_text = Gtk.TreeViewColumn("Text", renderer_text, text=0)
treeview.append_column(column_text)
######## CellRendererText with EntryCompletion example
renderer_text = Gtk.CellRendererText()
renderer_text.connect('editing-started', self.renderer_text_editing_started)
renderer_text.connect('edited', self.text_edited)
renderer_text.set_property("editable", True)
column_text_autocomplete = Gtk.TreeViewColumn("Editable Text", renderer_text, text=1)
treeview.append_column(column_text_autocomplete)
######## CellRendererCombo with EntryCompletion example
renderer_combo = Gtk.CellRendererCombo(model = self.liststore)
renderer_combo.set_property("text-column", 1)
renderer_combo.connect('editing-started', self.renderer_combo_editing_started)
renderer_combo.connect('changed', self.combo_changed)
renderer_combo.set_property("editable", True)
column_combo_autocomplete = Gtk.TreeViewColumn("Editable Combo", renderer_combo, text=1)
treeview.append_column(column_combo_autocomplete)
self.add(treeview)
def renderer_match_selected (self, completion, model, tree_iter):
''' beware ! the model and tree_iter passed in here are the model from the
EntryCompletion, which may or may not be the same as the model of the Treeview '''
text_match = model[tree_iter][1]
self.liststore[self.path][1] = text_match
def renderer_text_editing_started (self, renderer, editable, path):
''' since the editable widget gets created for every edit, we need to
connect the completion to every editable upon creation '''
editable.set_completion(self.completion)
self.path = path # save the path for later usage
def text_edited(self, widget, path, text):
self.liststore[path][1] = text
def renderer_combo_editing_started (self, renderer, combo, path):
''' since the editable widget gets created for every edit, we need to
connect the completion to every editable upon creation '''
editable = combo.get_child() # get the entry of the combobox
editable.set_completion(self.completion)
self.path = path # save the path for later usage
def combo_changed (self, combo, path, tree_iter):
''' the path is from the treeview and the tree_iter is from the model
of the combobox which may or may not be the same model as the treeview'''
combo_model = combo.get_property('model')
text = combo_model[tree_iter][1]
self.liststore[path][1] = text
win = CellRendererTextWindow()
win.connect("destroy", Gtk.main_quit)
win.show_all()
Gtk.main()
In the official docs, it is explicitly stated that the purpose of editing-started is to add a EntryCompletion and etc. I also subclassed Gtk.CellRendererText before I found that little hint in the docs.
Related
I tried it.
from PySide2 import QtWidgets
from PySide2 import QtGui
from PySide2 import QtCore
from PySide2.QtUiTools import QUiLoader
from maya.app.general.mayaMixin import MayaQWidgetBaseMixin
import shiboken2 as shiboken
import os
UIFILEPATH = 'D:/MAYA/pyside_pick/ui/PicsTest5.ui'
class MainWindow(MayaQWidgetBaseMixin,QtWidgets.QMainWindow):
def __init__(self,parent=None):
super(MainWindow,self).__init__(parent)
self.UI = QUiLoader().load(UIFILEPATH)
self.setWindowTitle(self.UI.windowTitle())
self.setCentralWidget(self.UI)
#image
img = QtGui.QPixmap('D:/MAYA/pyside_pick/images/imgKohaku.png')
self.scene = QtWidgets.QGraphicsScene(self)
item = QtWidgets.QGraphicsPixmapItem(img)
self.scene.addItem(item)
self.UI.graphicsView_char_1.setScene(self.scene)
#filter
self._filter = Filter()
self.installEventFilter(self._filter)
self.UI.pSphere1.installEventFilter(self._filter)
#primary
self.UI.label.setStyleSheet("QLabel {color : white;}")
self.UI.label.setText("A")
def labelTest(self):
self.UI.label.setStyleSheet("QLabel {color : red;}")
self.UI.label.setText("B")
print('D')
return False
class Filter(QtCore.QObject):
def eventFilter(self, widget, event):
win = MainWindow()
if event.type() == QtCore.QEvent.MouseButtonPress:
print(widget.objectName())
cmds.select(widget.objectName())
win.labelTest()
return False
def main():
win = MainWindow()
win.show()
if __name__ == '__main__':
main()
I clicked the button that 'pSphere1', but
self.UI.label.setStyleSheet("QLabel {color : red;}") self.UI.label.setText("B")
were look like it's not working.
I can change it inside define with UI loaded, but can't I do setText from outside?
How can I change the label of an imported UI file?
I find this, but I really do not understand. I couldn't find any mention of them beyond this page.
Change comboBox values in Qt .ui file with PySide2
If you know, I also want you to tell me where to put them.
Your issue is within the eventFilter(), and specifically the first line:
win = MainWindow()
This will create a new main window instance, which clearly doesn't make sense, since you obviously want to interact with the existing one.
While you could add the instance as an argument in the filter constructor in order to get a reference to the instance and directly call the function, that wouldn't be very good from the OOP point of view, as objects should never directly access attributes of their "parents".
A better and more correct approach would be to use a custom signal instead, and connect it from the main window instance:
class Filter(QtCore.QObject):
testSignal = QtCore.Signal()
def eventFilter(self, widget, event):
if event.type() == QtCore.QEvent.MouseButtonPress:
print(widget.objectName())
cmds.select(widget.objectName())
self.testSignal.emit()
return False
class MainWindow(MayaQWidgetBaseMixin, QtWidgets.QMainWindow):
def __init__(self, parent=None):
# ...
self._filter.testSignal.connect(self.labelTest)
Note that widgets could accept events and prevent propagation (for instance, buttons or graphics views that have selectable or movable items), so you might not receive the event in the filter in those cases.
I've noticed that QFormLayout in Pyside2 does not have the takeRow method like its PyQt5 counterpart. I've attempted to subclass QFormLayout to incorporate a similar method, but I've run into Runtime Errors, as the removal behavor of the LabelRole item is different than the FieldRole item. Another issue being that the LabelRole item does not actually get taken off the row even when the row itself is removed.
The following is the test sample I've been working with using Python 3.8.6:
from PySide2.QtWidgets import *
import sys
class MyFormLayout(QFormLayout):
def __init__(self, *args, **kwargs):
super(MyFormLayout, self).__init__(*args, **kwargs)
self.cache = []
print(f"Formlayout's identity: {self=}\nwith parent {self.parent()=}")
def takeRow(self, row: int):
print(f"Called {self.takeRow.__name__}")
print(f"{self.rowCount()=}")
label_item = self.itemAt(row, QFormLayout.LabelRole)
field_item = self.itemAt(row, QFormLayout.FieldRole)
print(f"{label_item=}\n{field_item=}")
self.removeItem(label_item)
self.removeItem(field_item)
self.removeRow(row) ## <-- This seems necessary to make the rowCount() decrement. Alternative?
label_item.widget().setParent(None) ## <-- Runtime Error Here?
field_item.layout().setParent(None)
self.cache.append(label_item.widget(), field_item)
print(f"{self.rowCount()=}")
print(f"{self.cache=}")
print(self.cache[0])
print("&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&")
return label_item, field_item
def restoreRow(self, insert_idx: int):
print(f"Called {self.restoreRow.__name__}")
print(f"{self.rowCount()=}")
print(f"{self.cache=}")
to_insert = self.cache.pop()
self.insertRow(insert_idx, to_insert[0], to_insert[1])
print("&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&")
class MyWindow(QWidget):
def __init__(self):
super(MyWindow, self).__init__()
self.mainlay = MyFormLayout(self)
self.cmb = QComboBox()
self.cmb.addItems(["Placeholder", "Remove 1 and 2"])
self.cmb.currentTextChanged.connect(self.remove_rows_via_combo)
self.current_text = self.cmb.currentText()
self.hlay1, self.le1, self.btn1 = self.le_and_btn(placeholderText="1")
self.hlay2, self.le2, self.btn2 = self.le_and_btn(placeholderText="2")
self.hlay3, self.le3, self.btn3 = self.le_and_btn(placeholderText="3")
self.hlay4, self.le4, self.btn4 = self.le_and_btn(placeholderText="4")
self.remove_btn = QPushButton("Remove", clicked=self.remove_row_via_click)
self.restore_btn = QPushButton("Restore", clicked=self.restore_a_row_via_click)
self.mainlay.addRow("Combobox", self.cmb)
for ii, hlayout in zip(range(1, 5), [self.hlay1, self.hlay2, self.hlay3, self.hlay4]):
self.mainlay.addRow(f"Row {ii}", hlayout)
self.mainlay.addRow(self.remove_btn)
self.mainlay.addRow(self.restore_btn)
#staticmethod
def le_and_btn(**kwargs):
hlay, le, btn = QHBoxLayout(), QLineEdit(**kwargs), QPushButton()
hlay.addWidget(le)
hlay.addWidget(btn)
return hlay, le, btn
def remove_row_via_click(self):
self.mainlay.takeRow(1)
def restore_a_row_via_click(self):
self.mainlay.restoreRow(1)
def remove_rows_via_combo(self, text):
print(f"{self.remove_rows_via_combo.__name__} received the text: {text}")
if text == "Remove 1 and 2":
self.mainlay.takeRow(1)
self.mainlay.takeRow(1)
if __name__ == '__main__':
app = QApplication(sys.argv)
win = MyWindow()
win.show()
sys.exit(app.exec_())
I would like to understand why the behavior of the role items is different and how the method may be properly re-implemented.
The problem is that the label was created internally by Qt from a string, rather than by explicitly creating a QLabel in Python. This means that when the row is removed, the last remaining reference is also removed, which deletes the label on the C++ side. After that, all that's left on the Python side is an empty PyQt wrapper - so when you try to call setParent on it, a RuntimeError will be raised, because the underlying C++ part no longer exists.
Your example can therefore be fixed by getting python references to the label/field objects before the layout-item is removed:
class MyFormLayout(QFormLayout):
...
def takeRow(self, row: int):
print(f"Called {self.takeRow.__name__}")
print(f"{self.rowCount()=}")
label_item = self.itemAt(row, QFormLayout.LabelRole)
field_item = self.itemAt(row, QFormLayout.FieldRole)
print(f"{label_item=}\n{field_item=}")
# get refs before removal
label = label_item.widget()
field = field_item.layout() or field_item.widget()
self.removeItem(label_item)
self.removeItem(field_item)
self.removeRow(row)
label.setParent(None)
field.setParent(None)
self.cache.append((label, field))
print(f"{self.rowCount()=}")
print(f"{self.cache=}")
print(self.cache[0])
print("&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&")
return label, field
This question already has an answer here:
How to save selected Items to Qsettings from QListWidget, QTableWidget
(1 answer)
Closed 3 years ago.
Need to save current values of QTableWidget. The QTableWidget will be iniside QTabWidget and there will be several adjacent tabs containing multiple tables in it. And inside the table there will be QCheckBox, QComoBox as cellwidgetitem which values also need to be saved. Beside this I also need to save value of QSpinBox and QDoubleSpinBox which are inside gridlayout. I am taking help of a code from https://gist.github.com/eyllanesc/be8a476bb7038c7579c58609d7d0f031 which saves values of QLineEdit inside a QFormLayout where the QFormLayout is inside a QTabWidget. If multiple tabs are instantiated then QLineEdit values inside the tabs cannot be saved. Moreover, if a QTableWidget is added below a QTabWidget then the values of the QTableWidget cannot be saved as well.
# -*- coding: utf-8 -*-
import sys
from PyQt5.QtCore import QFileInfo, QSettings
from PyQt5.QtGui import QIcon
from PyQt5.QtWidgets import qApp, QApplication, QMainWindow, QFormLayout, QLineEdit, QTabWidget, QWidget, QAction, QVBoxLayout, QTableWidget, QTableWidgetItem
def restore(settings):
finfo = QFileInfo(settings.fileName())
print(settings.fileName())
if finfo.exists() and finfo.isFile():
for w in qApp.allWidgets():
mo = w.metaObject()
if w.objectName() != "":
for i in range(mo.propertyCount()):
name = mo.property(i).name()
val = settings.value("{}/{}".format(w.objectName(), name), w.property(name))
w.setProperty(name, val)
def save(settings):
for w in qApp.allWidgets():
mo = w.metaObject()
if w.objectName() != "":
for i in range(mo.propertyCount()):
name = mo.property(i).name()
settings.setValue("{}/{}".format(w.objectName(), name), w.property(name))
class mainwindow(QMainWindow):
settings = QSettings("gui.ng", QSettings.IniFormat)
def __init__(self, parent=None):
super(mainwindow, self).__init__(parent)
self.setObjectName("MainWindow")
self.initUI()
restore(self.settings)
def initUI(self):
exitAction = QAction(QIcon('icon\\exit.png'), 'Exit', self)
exitAction.setShortcut('Ctrl+Q')
exitAction.triggered.connect(self.close)
self.toolbar = self.addToolBar('Exit')
self.toolbar.setMovable(False)
self.toolbar.addAction(exitAction)
self.tab_widget = QTabWidget(self) # add tab
self.tab_widget.setObjectName("tabWidget")
self.tab2 = QWidget()
self.tab2.setObjectName("tab2")
self.tab3 = QWidget()
self.tab3.setObjectName("tab3")
self.tab_widget.addTab(self.tab2, "Tab_2")
self.tab_widget.addTab(self.tab3, "Tab_3")
self.tab2UI()
self.tab3UI()
self.vlay = QVBoxLayout()
self.vlay.addWidget(self.tab_widget)
self.qtable = QTableWidget()
self.qtable.setRowCount(3)
self.qtable.setColumnCount(3)
self.qtable.setItem(0, 0, QTableWidgetItem("text1"))
self.qtable.setItem(0, 1, QTableWidgetItem("text1"))
self.qtable.setItem(0, 2, QTableWidgetItem("text1"))
self.qtable.setItem(1, 0, QTableWidgetItem("text2"))
self.qtable.setItem(1, 1, QTableWidgetItem("text2"))
self.qtable.setItem(1, 2, QTableWidgetItem("text2"))
self.qtable.setItem(2, 0, QTableWidgetItem("text3"))
self.qtable.setItem(2, 1, QTableWidgetItem("text3"))
self.qtable.setItem(2, 2, QTableWidgetItem("text3"))
self.vlay.addWidget(self.qtable)
self.qVlayWidget = QWidget()
self.qVlayWidget.setLayout(self.vlay)
self.setCentralWidget(self.qVlayWidget)
def tab2UI(self):
self.layout_2 = QFormLayout()
nameLe = QLineEdit(self)
nameLe.setObjectName("nameLe_2")
self.layout_2.addRow("Name_2", nameLe)
addressLe = QLineEdit()
addressLe.setObjectName("addressLe_2")
self.layout_2.addRow("Address_2", addressLe)
self.tab2.setLayout(self.layout_2)
def tab3UI(self):
self.layout_3 = QFormLayout()
nameLe = QLineEdit(self)
nameLe.setObjectName("nameLe_3")
self.layout_3.addRow("Name_3", nameLe)
addressLe = QLineEdit()
addressLe.setObjectName("addressLe_3")
self.layout_3.addRow("Address_3", addressLe)
self.tab3.setLayout(self.layout_3)
def closeEvent(self, event):
save(self.settings)
QMainWindow.closeEvent(self, event)
def main():
app = QApplication(sys.argv)
ex = mainwindow()
ex.setGeometry(100, 100, 1000, 600)
ex.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
The QLineEdit data is stored, the problem is that its not shown. The visible property of a widget depends on its ancestor[s]; since a QTabWidget has a QWidget for each of its tab, only the current one is visible, while the other (including all their children) are not visible. A QLineEdit is a complex widget, and if you manually unset the visible property to all its internal components, they won't be correctly restored again.
This becomes clear if you close the window with the second tab set as current: once you'll open it again, the second tab will be shown and its contents correctly displayed, while the first one QLineEdit won't.
A workaround for this is to check if the widget is "stored" as not visible and has a parent. If that's the case, just do not apply the visible property.
def restore(settings):
# ...
for w in qApp.allWidgets():
mo = w.metaObject()
parent = w.parent()
if w.objectName() != "":
for i in range(mo.propertyCount()):
name = mo.property(i).name()
val = settings.value("{}/{}".format(w.objectName(), name), w.property(name))
if name == 'visible' and val == 'false' and parent:
continue
w.setProperty(name, val)
That said, this is clearly not the good way to save the data of any widget, since it saves every property it has: the title of the example is "Functions to save and restore Widgets", not its editable data which is what you need.
Also, QTableWidget contents cannot be stored using this method, as its data is not part of the widget properties (and nothing else was saved anyway, because you didn't set its object name).
You have to find your own implementation to save those contents, which might be something similar to the following code.
Note that I'm using a QByteArray to store the table data. You create a QByteArray, then a QDataStream with it as argument, which is used for reading or writing. Note that both reading and writing are consequential, as data is always appended on writing or "popped-out" each time it has been read.
class mainwindow(QMainWindow):
# ...
def save(self):
# using findChildren is for simplicity, it's probably better to create
# your own list of widgets to cycle through
for w in self.findChildren((QLineEdit, QTableWidget)):
name = w.objectName()
if isinstance(w, QLineEdit):
self.settings.setValue("{}/text".format(name), w.text())
elif isinstance(w, QTableWidget):
# while we could add sub-setting keys for each combination of
# row/column items, it's better to store the data in a single
# "container"
data = QByteArray()
stream = QDataStream(data, QIODevice.WriteOnly)
rowCount = w.rowCount()
columnCount = w.columnCount()
# write the row and column count first
stream.writeInt(rowCount)
stream.writeInt(columnCount)
# then write the data
for row in range(rowCount):
for col in range(columnCount):
stream.writeQString(w.item(row, col).text())
self.settings.setValue("{}/data".format(name), data)
def restore(self):
for w in self.findChildren((QLineEdit, QTableWidget)):
name = w.objectName()
if isinstance(w, QLineEdit):
w.setText(self.settings.value("{}/text".format(name), w.text()))
elif isinstance(w, QTableWidget):
data = self.settings.value("{}/data".format(name))
if not data:
continue
stream = QDataStream(data, QIODevice.ReadOnly)
# read the row and column count first
rowCount = stream.readInt()
columnCount = stream.readInt()
w.setRowCount(rowCount)
w.setColumnCount(columnCount)
# then read the data
for row in range(rowCount):
for col in range(columnCount):
cellText = stream.readQString()
if cellText:
w.item(row, col).setText(cellText)
I am displaying data from an SQLite database in a QTableView using a QSqlTableModel. Letting the user edit this data works fine. However, for some columns I want to use QComboboxes instead of free text cells, to restrict the list of possible answers.
I have found this SO answer and am trying to implement it on my model/view setting, but I'm running into problems (so this is a follow-up).
Here's a full mini-example:
#!/usr/bin/python3
# -*- coding: utf-8 -*-
from PyQt5 import QtSql
from PyQt5.QtWidgets import (QWidget, QTableView, QApplication, QHBoxLayout,
QItemDelegate, QComboBox)
from PyQt5.QtCore import pyqtSlot
import sys
class ComboDelegate(QItemDelegate):
"""
A delegate that places a fully functioning QComboBox in every
cell of the column to which it's applied
source: https://gist.github.com/Riateche/5984815
"""
def __init__(self, parent, items):
self.items = items
QItemDelegate.__init__(self, parent)
def createEditor(self, parent, option, index):
combo = QComboBox(parent)
li = []
for item in self.items:
li.append(item)
combo.addItems(li)
combo.currentIndexChanged.connect(self.currentIndexChanged)
return combo
def setEditorData(self, editor, index):
editor.blockSignals(True)
# editor.setCurrentIndex(int(index.model().data(index))) #from original code
editor.setCurrentIndex(index.row()) # replacement
editor.blockSignals(False)
def setModelData(self, editor, model, index):
model.setData(index, editor.currentIndex())
#pyqtSlot()
def currentIndexChanged(self):
self.commitData.emit(self.sender())
class Example(QWidget):
def __init__(self):
super().__init__()
self.resize(400, 150)
self.createConnection()
self.fillTable() # comment out to skip re-creating the SQL table
self.createModel()
self.initUI()
def createConnection(self):
self.db = QtSql.QSqlDatabase.addDatabase("QSQLITE")
self.db.setDatabaseName("test.db")
if not self.db.open():
print("Cannot establish a database connection")
return False
def fillTable(self):
self.db.transaction()
q = QtSql.QSqlQuery()
q.exec_("DROP TABLE IF EXISTS Cars;")
q.exec_("CREATE TABLE Cars (Company TEXT, Model TEXT, Year NUMBER);")
q.exec_("INSERT INTO Cars VALUES ('Honda', 'Civic', 2009);")
q.exec_("INSERT INTO Cars VALUES ('VW', 'Golf', 2013);")
q.exec_("INSERT INTO Cars VALUES ('VW', 'Polo', 1999);")
self.db.commit()
def createModel(self):
self.model = QtSql.QSqlTableModel()
self.model.setTable("Cars")
self.model.select()
def initUI(self):
layout = QHBoxLayout()
self.setLayout(layout)
view = QTableView()
layout.addWidget(view)
view.setModel(self.model)
view.setItemDelegateForColumn(0, ComboDelegate(self, ["VW", "Honda"]))
for row in range(0, self.model.rowCount()):
view.openPersistentEditor(self.model.index(row, 0))
def closeEvent(self, e):
for row in range(self.model.rowCount()):
print("row {}: company = {}".format(row, self.model.data(self.model.index(row, 0))))
if (self.db.open()):
self.db.close()
def main():
app = QApplication(sys.argv)
ex = Example()
ex.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
In this case, I want to use a QCombobox on the "Company" column. It should be displayed all the time, so I'm calling openPersistentEditor.
Problem 1: default values I would expect that this shows the non-edited field's content when not edited (i.e. the company as it is listed in the model), but instead it apparently shows the ith element of the combobox's choices.
How can I make each combobox show the model's actual content for this field by default?
Problem 2: editing When you comment out "self.fill_table()" you can check whether the edits arrive in the SQL database. I would expect that choosing any field in the dropdown list would replace the original value. But (a) I have to make every choice twice (the first time, the value displayed in the cell remains the same), and (b) the data appears in the model weirdly (changing the first column to 'VW', 'Honda', 'Honda' results in ('1', 'VW', '1' in the model). I think this is because the code uses editor.currentIndex() in the delegate's setModelData, but I have not found a way to use the editor's content instead. How can I make the code report the user's choices correctly back to the model? (And how do I make this work on first click, instead of needing 2 clicks?)
Any help greatly appreciated. (I have read the documentation on QAbstractItemDelegate, but I don't find it particularly helpful.)
Found the solution with the help of the book Rapid GUI Programming with Python and Qt:
createEditor and setEditorData do not work as I expected (I was misguided because the example code looked like it was using the text content but instead was dealing with index numbers). Instead, they should look like this:
def setEditorData(self, editor, index):
editor.blockSignals(True)
text = index.model().data(index, Qt.DisplayRole)
try:
i = self.items.index(text)
except ValueError:
i = 0
editor.setCurrentIndex(i)
editor.blockSignals(False)
def setModelData(self, editor, model, index):
model.setData(index, editor.currentText())
I hope this helps someone down the line.
Please axplain how to enable and show a tooltip for each item in QTreeView. I found a sample of code class TreeModel(QAbstractItemModel) but due to my beginner's level I can't understand how to apply it to my needs.
Data for tooltip should be taken from value of key "note" in dictionary data_for_tree.
#!/usr/bin/env python -tt
# -*- coding: utf-8 -*-
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
import sys
reload(sys)
sys.setdefaultencoding('utf8')
data_for_tree = {"tomato":{"color":"red","ammount":"10", "note":"a note for tomato"},"banana":{"color":"yellow","ammount":"1", "note":"b note for banana"}, "some fruit":{"color":"unknown","ammount":"100", "note":"some text"}}
class TreeModel(QAbstractItemModel):
def data(self, index, role=Qt.DisplayRole):
#...
if role == Qt.ToolTipRole:
return 'ToolTip'
def flags(self, index):
if not index.isValid():
return Qt.NoItemFlags # 0
return Qt.ItemIsSelectable # or Qt.ItemIsEnabled
class ProxyModel(QSortFilterProxyModel):
def __init__(self, parent=None):
super(ProxyModel, self).__init__(parent)
def lessThan(self, left, right):
leftData = self.sourceModel().data(left)
rightData = self.sourceModel().data(right)
try:
return float(leftData) < float(rightData)
except ValueError:
return leftData < rightData
class MainFrame(QWidget):
def __init__(self):
QWidget.__init__(self)
self.MyTreeView = QTreeView()
self.MyTreeViewModel = QStandardItemModel()
self.MyTreeView.setModel(self.MyTreeViewModel)
self.most_used_cat_header = ['Name', "ammount", "color"]
self.MyTreeViewModel.setHorizontalHeaderLabels(self.most_used_cat_header)
self.MyTreeView.setSortingEnabled(True)
self.MyTreeView_Fill()
MainWindow = QHBoxLayout(self)
MainWindow.addWidget(self.MyTreeView)
self.setLayout(MainWindow)
def MyTreeView_Fill(self):
for k in data_for_tree:
name = QStandardItem(k)
ammount = QStandardItem(data_for_tree[k]["ammount"])
note = QStandardItem(data_for_tree[k]["color"])
tooltip = data_for_tree[k]["note"]
item = (name, ammount, note)
self.MyTreeViewModel.appendRow(item)
self.MyTreeView.sortByColumn(1, Qt.DescendingOrder)
proxyModel = ProxyModel(self)
proxyModel.setSourceModel(self.MyTreeViewModel)
self.MyTreeView.setModel(proxyModel)
c = 0
while c < len(self.most_used_cat_header):
self.MyTreeView.resizeColumnToContents(c)
c=c+1
if __name__ == "__main__":
app = QApplication(sys.argv)
main = MainFrame()
main.show()
main.move(app.desktop().screen().rect().center() - main.rect().center())
sys.exit(app.exec_())
As you are using the QStandardItem and QStandardItemModel classes (which is what I would recommend!) you don't need to bother with the TreeModel class you have found. Creating your own model is rarely necessary, but for some reason tutorials often encourage you to do so. If you find something encouraging you to subclass QAbstractItemModel, I suggest you check on stack overflow first to see if there is a simpler way to do it! In this case, there is a very simple way to add your tooltips.
If you look at the C++ documentation (which I often find more useful than the PyQt documentation for finding out what methods are available), you will see that QStandardItem has a method called setToolTip().
So all you need to do is call this method on each of the items you add to the model. For example, inside the loop in the MyTreeView_Fill method:
name = QStandardItem(k)
ammount = QStandardItem(data_for_tree[k]["ammount"])
note = QStandardItem(data_for_tree[k]["color"])
tooltip = data_for_tree[k]["note"]
name.setToolTip(tooltip)
ammount.setToolTip(tooltip)
note.setToolTip(tooltip)
Here I've set the tooltip to be the same for every cell in the row (name, amount and note) but you could easily change this to have a different tooltip for one of the cells (hopefully it is obvious how to do that)