I have a login screen dialog written using pyqt and python and it shows a dialog pup up when it runs and you can type in a certin username and password to unlock it basicly. It's just something simple I made in learning pyqt. I'm trying to take and use it somewhere else but need to know if there is a way to prevent someone from using the x button and closing it i would like to also have it stay on top of all windows so it cant be moved out of the way? Is this possible? I did some research and couldn't find anything that could help me.
Edit:
as requested here is the code:
from PyQt4 import QtGui
class Test(QtGui.QDialog):
def __init__(self):
QtGui.QDialog.__init__(self)
self.textUsername = QtGui.QLineEdit(self)
self.textPassword = QtGui.QLineEdit(self)
self.loginbuton = QtGui.QPushButton('Test Login', self)
self.loginbuton.clicked.connect(self.Login)
layout = QtGui.QVBoxLayout(self)
layout.addWidget(self.textUsername)
layout.addWidget(self.textPassword)
layout.addWidget(self.loginbuton)
def Login(self):
if (self.textUsername.text() == 'Test' and
self.textPassword.text() == 'Password'):
self.accept()
else:
QtGui.QMessageBox.warning(
self, 'Wrong', 'Incorrect user or password')
class Window(QtGui.QMainWindow):
def __init__(self):
QtGui.QMainWindow.__init__(self)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
if Test().exec_() == QtGui.QDialog.Accepted:
window = Window()
window.show()
sys.exit(app.exec_())
Bad news first, it is not possible to remove the close button from the window, based on the Riverbank mailing system
You can't remove/disable close button because its handled by the
window manager, Qt can't do anything there.
Good news, you can override and ignore, so that when the user sends the event, you can ignore or put a message or something.
Read this article for ignoring the QCloseEvent
Also, take a look at this question, How do I catch a pyqt closeEvent and minimize the dialog instead of exiting?
Which uses this:
class MyDialog(QtGui.QDialog):
# ...
def __init__(self, parent=None):
super(MyDialog, self).__init__(parent)
# when you want to destroy the dialog set this to True
self._want_to_close = False
def closeEvent(self, evnt):
if self._want_to_close:
super(MyDialog, self).closeEvent(evnt)
else:
evnt.ignore()
self.setWindowState(QtCore.Qt.WindowMinimized)
You can disable the window buttons in PyQt5.
The key is to combine it with "CustomizeWindowHint",
and exclude the ones you want to be disabled.
Example:
#exclude "QtCore.Qt.WindowCloseButtonHint" or any other window button
self.setWindowFlags(
QtCore.Qt.Window |
QtCore.Qt.CustomizeWindowHint |
QtCore.Qt.WindowTitleHint |
QtCore.Qt.WindowMinimizeButtonHint
)
Result with QDialog:
Reference: https://doc.qt.io/qt-5/qt.html#WindowType-enum
Tip: if you want to change flags of the current window, use window.show()
after window.setWindowFlags,
because it needs to refresh it, so it calls window.hide().
Tested with QtWidgets.QDialog on:
Windows 10 x32,
Python 3.7.9,
PyQt5 5.15.1
.
I don't know if you want to do this but you can also make your window frameless. To make window frameless you can set the window flag equal to QtCore.Qt.FramelessWindowHint
Related
I implement a label that displays the current time in several of my PyQt5 applications. Here is a MRE:
import sys
import logging
from PyQt5 import QtWidgets, QtCore, QtGui
__log__ = logging.getLogger()
class App(QtWidgets.QApplication):
def __init__(self, sys_argv):
super(App, self).__init__(sys_argv)
self.main_view = MainView()
self.main_view.show()
class MainView(QtWidgets.QMainWindow):
def __init__(self):
super().__init__()
self.setObjectName("MreUi")
self.resize(300, 100)
self.setWindowTitle('MreUi')
self.label = QtWidgets.QLabel()
self.setCentralWidget(self.label)
config_clock(self.label)
self.start_clocks()
def start_clocks(self):
timer = QtCore.QTimer(self)
timer.timeout.connect(self.show_time)
timer.start(1000)
def show_time(self):
current_time = QtCore.QTime.currentTime()
clock_label_time = current_time.toString('hh:mm:ss')
self.label.setText(clock_label_time)
def config_clock(label):
label.setAlignment(QtCore.Qt.AlignCenter)
font = QtGui.QFont('Arial', 24, QtGui.QFont.Bold)
label.setFont(font)
if __name__ == '__main__':
logging.basicConfig()
app = App(sys.argv)
try:
sys.exit(app.exec_())
except Exception as e:
__log__.error('%s', e)
As I implemented a similar clock in several of my PyQt apps, I thought it would be nice to implement it as a component / encapsulate it. First I thought of doing this by calling a config_clock function from any QWidget, and have that function do ~ALL of the work implementing the clock for the specified label. This would avoid having to repeat myself in multiple applications from writing/calling start_clocks and show_time instance methods of MainView. but as I started to code that ...
# from inside my QWidget:
config_clock(self.label)
# this function would live outisde the class, thus reusable by diff Qt apps:
def config_clock(label):
# start the clock
# set default font, etc for label
# instantiate QtCore.QTimer
# # but that's when I realized I've always passed self to QtCore.QTimer and that maybe encapsulating this isn't as trivial as I thought.
Should I create some kind of ClockLabel() object of my own that gets passed a QtWidget's label and can also be an instance attribute of each QtWidget that might need it? That smells kind of clunky to me. But surely there must be a way to make a 'reusable component' in PyQt, I just don't know how...
I also am not certain if the MainView(QtWidgets.QMainWindow) could rightly be referred to as the 'parent class' if I were to pass it as a parameter to a ClockLabel() class I write or a config_clock function whose signature could look like:
def config_clock(label, parent_qtwidget):
# also feels clunky and not sure if parent would be the right term
Thanks
With QtWidgets it is normal to specialize widgets by inheritance. Here is an example of how you might rearrange your code to produce a reusable widget:
class ClockLabel(QtWidgets.QLabel):
def __init__(self, parent=None):
super().__init__(parent)
self.setAlignment(QtCore.Qt.AlignCenter)
font = QtGui.QFont('Arial', 24, QtGui.QFont.Bold)
self.setFont(font)
self._timer = QtCore.QTimer(self)
self._timer.timeout.connect(self._show_time)
def start(self):
self._timer.start(1000)
def stop(self):
self._timer.stop()
def _show_time(self):
current_time = QtCore.QTime.currentTime()
clock_label_time = current_time.toString('hh:mm:ss')
self.setText(clock_label_time)
I'm working on a GUI project where the user is faced with the following QDialog:
class StockSelectorDialog(QDialog, stockselector_ui):
def __init__(self, parent_, *args, **kwargs):
super(StockSelectorDialog, self).__init__(*args, **kwargs)
self.setAttribute(Qt.WA_DeleteOnClose, on=True)
self.setupUi(self)
self.dialogButtonBox.accepted.connect(self.accept)
self.dialogButtonBox.rejected.connect(self.reject)
self.parent_ = parent_
self.symbolsbuffer = parent_.symbols.copy()
self.symbolmodel = SymbolListModel(self)
self.listView.setModel(self.symbolmodel)
self.symbolAddButton.clicked.connect(self.onAddButtonClicked)
self.symbolDeleteButton.clicked.connect(self.onDeleteButtonClicked)
def onAddButtonClicked(self, s):
symbol = self.symbolEdit.text()
if symbol:
self.symbolsbuffer.append(symbol)
self.symbolmodel.layoutChanged.emit()
self.symbolEdit.setText("")
def onDeleteButtonClicked(self, s):
indexes = self.listView.selectedIndexes()
if indexes:
for i in indexes:
del self.symbolsbuffer[i.row()]
self.symbolmodel.layoutChanged.emit()
self.listView.clearSelection()
def accept(self):
self.parent_.symbols = self.symbolsbuffer
self.parent_.onSymbolsChanged()
self.close()
def reject(self):
self.close()
The UI file is here: https://github.com/danib-prog/stockmarket-helper/blob/master/stockselector.ui
Everything worked fine until I added the buffer sysytem, for which I had to reimplement the accept and the reject slots of the dialog (although I'm not very sure about the latter). Now the dialog opens when necessary and the ListView works fine with all the buttons and the LineEdit, but my dialogButtonBox is not responding.
Why is this happening? And what is a solution to the problem?
You should not call close() on a dialog for that, mostly because it causes itself a call to reject(); luckily Qt is smart enough to prevent recursion, but the point remains: both those methods are expected to set the dialog's result and use done(), of close(), so that their event loop correctly exits from its exec_().
If you need to override a class function to do something other than the default behavior, you should always remember to call the base implementation too in order to correctly achieve the expected result.
def accept(self):
self.parent_.symbols = self.symbolsbuffer
self.parent_.onSymbolsChanged()
super(StockSelectorDialog, self).accept()
def reject(self):
super(StockSelectorDialog, self).reject()
Also, note that Qt Designer already connects the buttons of a QDialogButtonBox when it's created using the default dialog templates with buttons, so you should not connect them again, otherwise both accept and reject would be called twice.
I have tried every suggestion I can come across online, from setting flags to using selectionModel
def DatabaseLoadWrapper(self,database, init):
self.treeWidget.currentItemChanged.disconnect(self.updateStackedWidget)
self.DatabaseLoad(database, init)
self.treeWidget.clearSelection()
self.treeWidget.setCurrentItem(self.treeWidget.findItems(self.selectedDatabase,Qt.MatchExactly|Qt.MatchRecursive)[0])
self.treeWidget.currentItemChanged.connect(self.updateStackedWidget)
This is where my code needs to force a selection on the QTreeWidget, none of the code I use throws up any errors but also has no effect on the selection. And I end up with this where the user has selected Database 1 but I need to revert back to having only Database 2 selected:
Edit: The Tree Widget is built using this code:
def setupMenu(self):
self.DatabaseParent = QTreeWidgetItem(['Databases'])
for item in NamesInDatabase():
self.DatabaseParent.addChild(QTreeWidgetItem([item]))
self.AverageParent = QTreeWidgetItem(['Averaged Database'])
self.SortingParent = QTreeWidgetItem(['Waste Composition'])
self.ResultParent = QTreeWidgetItem(['Results'])
self.treeWidget.addTopLevelItem(self.DatabaseParent)
self.treeWidget.addTopLevelItem(self.AverageParent)
self.treeWidget.addTopLevelItem(self.SortingParent)
self.treeWidget.addTopLevelItem(self.ResultParent)
It basically is adding databases, averaged database, waste compisition & results, as fixed parts of the navigation menu and then populating children of databases with the names of the databases in the save file.
Your question fails to expose the part of the code that is causing the problem. By default, setting the current item, as you do, also sets the selection. So this code, for example, correctly sets the selection to item "b":
from PySide import QtCore,QtGui
if __name__ == '__main__':
import sys
qApp = QtGui.QApplication(sys.argv)
treeWidget = QtGui.QTreeWidget()
parent = QtGui.QTreeWidgetItem(['Databases'])
items = []
for item_text in ["a","b","c"]:
item = QtGui.QTreeWidgetItem([item_text])
items.append(item)
parent.addChild(item)
treeWidget.addTopLevelItem(parent)
treeWidget.setCurrentItem(items[1])
treeWidget.show()
sys.exit(qApp.exec_())
However, I suspect there is code elsewhere in your project that is affecting this. For example, if you had set the selection mode for the QTableWidget selection model to MultiSelection then selections become cumulative:
from PySide import QtCore,QtGui
if __name__ == '__main__':
import sys
qApp = QtGui.QApplication(sys.argv)
treeWidget = QtGui.QTreeWidget()
parent = QtGui.QTreeWidgetItem(['Databases'])
items = []
for item_text in ["a","b","c"]:
item = QtGui.QTreeWidgetItem([item_text])
items.append(item)
parent.addChild(item)
treeWidget.addTopLevelItem(parent)
treeWidget.setSelectionMode(QtGui.QAbstractItemView.MultiSelection)
treeWidget.setCurrentItem(items[0])
treeWidget.setCurrentItem(items[2])
treeWidget.show()
sys.exit(qApp.exec_())
However, that still doesn't explain your issue because the clearSelection call should have cleared the preceding selection in any case. Further debugging of your code is needed, for example to check that the wrapper function and the setCurrentItem are being called as you claim. Also check what else is being called subsequent to the DatabaseLoadWrapper.
In Pyside2, This works for me:
If you click on treewidget the selection will be clear.
self.treeWidget.setSelectionMode(QtWidgets.QAbstractItemView.ContiguousSelection)
shift+tab behaves as tab in QTextEdit/QPlainTextEdit.
Looks like a common problem with no good solution.
Is there any "classical" way to enable this functionality when tab increases indentation level and shift-tab decreases it?
This is a bit of an old question, but I got this figured out.
You just need to reimplement QPlainTextEdit (or QTextEdit) with your own class that inherits from it, and override the keyPressEvent.
By default a tab inserts a tabstop, but the below code catches a Qt.Key_Backtab event, which as near as I can tell is the event that occurs when you press Shift+Tab.
I tried and failed to catch Qt.Key_Tab and a Qt.Key_Shift or Qt.Key_Tab and a Shift modifier, so this must be the way to do it.
import sys
from PyQt4 import QtCore, QtGui
class TabPlainTextEdit(QtGui.QTextEdit):
def __init__(self,parent):
QtGui.QTextEdit.__init__(self, parent)
def keyPressEvent(self, event):
if event.key() == QtCore.Qt.Key_Backtab:
cur = self.textCursor()
# Copy the current selection
pos = cur.position() # Where a selection ends
anchor = cur.anchor() # Where a selection starts (can be the same as above)
# Can put QtGui.QTextCursor.MoveAnchor as the 2nd arg, but this is the default
cur.setPosition(pos)
# Move the position back one, selection the character prior to the original position
cur.setPosition(pos-1,QtGui.QTextCursor.KeepAnchor)
if str(cur.selectedText()) == "\t":
# The prior character is a tab, so delete the selection
cur.removeSelectedText()
# Reposition the cursor with the one character offset
cur.setPosition(anchor-1)
cur.setPosition(pos-1,QtGui.QTextCursor.KeepAnchor)
else:
# Try all of the above, looking before the anchor (This helps if the achor is before a tab)
cur.setPosition(anchor)
cur.setPosition(anchor-1,QtGui.QTextCursor.KeepAnchor)
if str(cur.selectedText()) == "\t":
cur.removeSelectedText()
cur.setPosition(anchor-1)
cur.setPosition(pos-1,QtGui.QTextCursor.KeepAnchor)
else:
# Its not a tab, so reset the selection to what it was
cur.setPosition(anchor)
cur.setPosition(pos,QtGui.QTextCursor.KeepAnchor)
else:
return QtGui.QTextEdit.keyPressEvent(self, event)
def main():
app = QtGui.QApplication(sys.argv)
w = TabPlainTextEdit(None)
w.show()
sys.exit(app.exec_())
if __name__ == "__main__":
main()
I'm still refining this, but the rest of the code is on GitHub.
I've got a Qt4 application (using the PyQt bindings) which contains a QListWidget, initialized like so:
class MyList(QtGui.QListWidget):
def __init__(self):
QtGui.QListWidget.__init__(self)
self.setDragDropMode(self.InternalMove)
I can add items, and this allows me to drag and drop to reorder the list. But how do I get notification when the list gets reordered by the user? I tried adding a dropMimeData(self, index, data, action) method to the class, but it never gets called.
I have an easier way. :)
You can actually access the listwidget's internal model with myList->model() - and from there there are lots of signals available.
If you only care about drag&drop, connect to layoutChanged.
If you have move buttons (which usually are implemented with remove+add) connect to rowsInserted too.
If you want to know what moved, rowsMoved might be better than layoutChanged.
I just had to deal with this and it's a pain in the ass but here's what to do:
You have to install an eventFilter on your ListWidget subclass and then watch for the ChildRemoved event. This event covers moves as well as removal, so it should work for re-arranging items with drag and drop inside a list.
I write my Qt in C++, but here's a pythonification version:
class MyList(QtGui.QListWidget):
def __init__(self):
QtGui.QListWidget.__init__(self)
self.setDragDropMode(self.InternalMove)
self.installEventFilter(self)
def eventFilter(self, sender, event):
if (event.type() == QEvent.ChildRemoved):
self.on_order_changed()
return False # don't actually interrupt anything
def on_order_changed(self):
# do magic things with our new-found knowledge
If you have some other class that contains this list, you may want to move the event filter method there. Hope this helps, I know I had to fight with this for a day before figuring this out.
I found Trey Stout's answer did work however I was obviously getting events when the list order had not actually changed. I turned to Chani's answer which does work as required but with no code it took me a little work to implement in python.
I thought I would share the code snippet to help out future visitors:
class MyList(QListWidget):
def __init__(self):
QListWidget.__init__(self)
self.setDragDropMode(self.InternalMove)
list_model = self.model()
list_model.layoutChanged.connect(self.on_layout_changed)
def on_layout_changed(self):
print "Layout Changed"
This is tested in PySide but see no reason it wouldn't work in PyQt.
I know this is old, but I was able to get my code to work using Trey's answer and wanted to share my python solution. This is for a QListWidget inside a QDialog, not one that is sub-classed.
class NotesDialog(QtGui.QDialog):
def __init__(self, notes_list, notes_dir):
QtGui.QDialog.__init__(self)
self.ui=Ui_NotesDialog()
# the notesList QListWidget is created here (from Qt Designer)
self.ui.setupUi(self)
# install an event filter to catch internal QListWidget drop events
self.ui.notesList.installEventFilter(self)
def eventFilter(self, sender, event):
# this is the function that processes internal drop in notesList
if event.type() == QtCore.QEvent.ChildRemoved:
self.update_views() # do something
return False # don't actually interrupt anything
Not a solution, but some ideas:
You should probably check what is returned by supportedDropActions method. It might be that you need to overwrite that method, to include Qt::MoveAction or Qt::CopyAction.
You have QListView::indexesMoved signal, but I am not sure whether it will be emitted if you're using QListWidget. It worths checking.
The QListWidget.model() approach seemed the most elegant of the proposed solutions but did not work for me in PyQt5. I don't know why, but perhaps something changed in the move to Qt5. The eventFilter approach did work, but there is another alternative that is worth considering: over-riding the QDropEvent and checking if event.source is self. See the code below which is an MVCE with all of the proposed solutions coded in for checking in PyQt5:
import sys
from PyQt5 import QtGui, QtWidgets, QtCore
class MyList(QtWidgets.QListWidget):
itemMoved = QtCore.pyqtSignal()
def __init__(self):
super(MyList, self).__init__()
self.setDragDropMode(self.InternalMove)
list_model = self.model()
# list_model.layoutChanged.connect(self.onLayoutChanged) # doesn't work
# self.installEventFilter(self) # works
self.itemMoved.connect(self.onLayoutChanged) # works
def onLayoutChanged(self):
print("Layout Changed")
def eventFilter(self, sender, event):
"""
Parameters
----------
sender : object
event : QtCore.QEvent
"""
if event.type() == QtCore.QEvent.ChildRemoved:
self.onLayoutChanged()
return False
def dropEvent(self, QDropEvent):
"""
Parameters
----------
QDropEvent : QtGui.QDropEvent
"""
mime = QDropEvent.mimeData() # type: QtCore.QMimeData
source = QDropEvent.source()
if source is self:
super(MyList, self).dropEvent(QDropEvent)
self.itemMoved.emit()
app = QtWidgets.QApplication([])
form = MyList()
for text in ("one", "two", "three"):
item = QtWidgets.QListWidgetItem(text)
item.setFlags(item.flags() | QtCore.Qt.ItemIsUserCheckable)
item.setFlags(item.flags() | QtCore.Qt.ItemIsEditable)
item.setCheckState(QtCore.Qt.Checked)
form.addItem(item)
form.show()
sys.exit(app.exec_())