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PyQt5 signals and threading.Timer


PyQt5 signals and threading.Timer

By : Kramer M.
Date : November 22 2020, 03:01 PM
With these it helps Some sleep and further googling may have yielded the solution:
It appears that while such interthread signalling works in general, the PyQt5 dataChanged signal in particular has a quirk which gives this behaviour: a third, optional argument with the QVector C++ signature, which apparently isn't registered in Qt as a metatype (caveat: I don't really know what I'm talking about there), something that the developers seem to have declined to fix.
code :
from PyQt5.QtCore import pyqtSignal
myDataChanged = pyqtSignal('QModelIndex', 'QModelIndex')
self.table.model().dataChanged.emit(top_left_ix, bottom_right_ix)


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c# threading: creating a comcomponent via threading.timer and disposing of same component from a different threadingTime

c# threading: creating a comcomponent via threading.timer and disposing of same component from a different threadingTime


By : Mingyu Lee
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I found the solution to my problem here: http://www.codeproject.com/Articles/12082/A-DelegateQueue-Class
How to add signals to a QLabel in PyQt5?

How to add signals to a QLabel in PyQt5?


By : mundovacio
Date : March 29 2020, 07:55 AM
hope this fix your issue I have the code below for a interactive label in PyQt4 that can be clicked, right clicked and scrolled. I am converting the code for PyQt5 and lots of things in my code are right now based on this element. , Ok, after a lot of things I understood what I was doing wrong:
code :
from PyQt5 import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *

class ExtendedQLabel(QLabel):
    def __init(self, parent):
        super().__init__(parent)

    clicked = pyqtSignal()
    rightClicked = pyqtSignal()

    def mousePressEvent(self, ev):
        if ev.button() == Qt.RightButton:
            self.rightClicked.emit()
        else:
            self.clicked.emit()

if __name__ == '__main__':
    app = QApplication([])
    eql = ExtendedQLabel()
    eql.clicked.connect(lambda: print('clicked'))
    eql.rightClicked.connect(lambda: print('rightClicked'))
    eql.show()
    app.exec_()
PyQt5 Signals and Threading

PyQt5 Signals and Threading


By : J.C.
Date : March 29 2020, 07:55 AM
Hope this helps The signal must be created, inside your ThreadClass, or before but as you emit the signal inside the ThreadClass, it is better to create it inside your class.
After creation, you need to connect it to the progress bar function. Here is an example of the signal created and connected inside your class.
code :
class ThreadClass(QtCore.QThread):
    # Create the signal
    sig = QtCore.pyqtSignal(int)

    def __init__(self, parent=None):
        super(ThreadClass, self).__init__(parent)

        # Connect signal to the desired function
        self.sig.connect(updateProgBar)

    def run(self):
        while True:
            val = sysInfo.getCpu()

            # Emit the signal
            self.sig.emit(val)
Signals and slots in PyQt5

Signals and slots in PyQt5


By : user2888247
Date : March 29 2020, 07:55 AM
it fixes the issue I have been trying to convert the following code to PyQt5. After changing QtGui.QTextEdit to QtWidgets.QTextEdit and making other small modifications, I am stuck at the line: , The following are the main changes:
code :
from PyQt5 import QtCore, QtGui, QtWidgets


class MyTextEdit(QtWidgets.QTextEdit):
    def __init__(self, parent=None):
        super(MyTextEdit, self).__init__(parent)
        font = QtGui.QFont()
        font.setPointSize(12)
        self.setFont(font)
        self.completer = None

    def setCompleter(self, completer):
        if self.completer:
            self.disconnect(self.completer, 0, self, 0)
        if not completer:
            return

        completer.setWidget(self)
        completer.setCompletionMode(QtWidgets.QCompleter.PopupCompletion)
        completer.setCaseSensitivity(QtCore.Qt.CaseInsensitive)
        self.completer = completer
        self.completer.insertText.connect(self.insertCompletion)

    def insertCompletion(self, completion):
        tc = self.textCursor()
        extra = len(completion) - len(self.completer.completionPrefix())
        tc.movePosition(QtGui.QTextCursor.Left)
        tc.movePosition(QtGui.QTextCursor.EndOfWord)
        tc.insertText(completion[-extra:])
        self.setTextCursor(tc)

    def textUnderCursor(self):
        tc = self.textCursor()
        tc.select(QtGui.QTextCursor.WordUnderCursor)
        return tc.selectedText()

    def focusInEvent(self, event):
        if self.completer:
            self.completer.setWidget(self)
        super(MyTextEdit, self).focusInEvent(event)

    def keyPressEvent(self, event):
        if (
            self.completer
            and self.completer.popup()
            and self.completer.popup().isVisible()
        ):
            if event.key() in (
                QtCore.Qt.Key_Enter,
                QtCore.Qt.Key_Return,
                QtCore.Qt.Key_Escape,
                QtCore.Qt.Key_Tab,
                QtCore.Qt.Key_Backtab,
            ):
                event.ignore()
                return
        ## has ctrl-Space been pressed??
        isShortcut = (
            event.modifiers() == QtCore.Qt.ControlModifier
            and event.key() == QtCore.Qt.Key_Space
        )
        ## modifier to complete suggestion inline ctrl-e
        inline = (
            event.modifiers() == QtCore.Qt.ControlModifier
            and event.key() == QtCore.Qt.Key_E
        )
        ## if inline completion has been chosen
        if inline:
            # set completion mode as inline
            self.completer.setCompletionMode(
                QtWidgets.QCompleter.InlineCompletion
            )
            completionPrefix = self.textUnderCursor()
            if completionPrefix != self.completer.completionPrefix():
                self.completer.setCompletionPrefix(completionPrefix)
            self.completer.complete()

            # set the current suggestion in the text box
            self.completer.insertText.emit(self.completer.currentCompletion())
            # reset the completion mode
            self.completer.setCompletionMode(
                QtWidgets.QCompleter.PopupCompletion
            )
            return
        if not self.completer or not isShortcut:
            pass
            super(MyTextEdit, self).keyPressEvent(event)

        ctrlOrShift = event.modifiers() in (
            QtCore.Qt.ControlModifier,
            QtCore.Qt.ShiftModifier,
        )
        if ctrlOrShift and event.text() == "":
            return
        eow = "~!@#$%^&*+{}|:\"<>?,./;'[]\\-="  # end of word

        hasModifier = (
            event.modifiers() != QtCore.Qt.NoModifier
        ) and not ctrlOrShift

        completionPrefix = self.textUnderCursor()

        if not isShortcut:
            if self.completer.popup():
                self.completer.popup().hide()
            return

        self.completer.setCompletionPrefix(completionPrefix)
        popup = self.completer.popup()
        popup.setCurrentIndex(self.completer.completionModel().index(0, 0))
        cr = self.cursorRect()
        cr.setWidth(
            self.completer.popup().sizeHintForColumn(0)
            + self.completer.popup().verticalScrollBar().sizeHint().width()
        )
        self.completer.complete(cr)  ## popup it up!


class MyDictionaryCompleter(QtWidgets.QCompleter):
    insertText = QtCore.pyqtSignal(str)

    def __init__(self, parent=None):

        myKeywords =['apple','aggresive','ball','bat','cat','cycle','dog','dumb',\
                     'elephant','engineer','food','file','good','great',\
                     'hippopotamus','hyper','india','ireland','just','just',\
                     'key','kid','lemon','lead','mute','magic',\
                     'news','newyork','orange','oval','parrot','patriot',\
                     'question','queue','right','rest','smile','simple',\
                     'tree','urban','very','wood','xylophone','yellow',\
                     'zebra']
        super(MyDictionaryCompleter, self).__init__(myKeywords, parent)
        self.activated.connect(self.changeCompletion)

    @QtCore.pyqtSlot(str)
    def changeCompletion(self, completion):
        print(completion)
        if completion.find("(") != -1:
            completion = completion[: completion.find("(")]
        print(completion)
        self.insertText.emit(completion)


if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    completer = MyDictionaryCompleter()
    te = MyTextEdit()
    te.setCompleter(completer)
    te.show()
    sys.exit(app.exec_())
how to emit two signals in pyqt5

how to emit two signals in pyqt5


By : user3687232
Date : March 29 2020, 07:55 AM
should help you out The logic is only to detect the clicked QPushButton and to verify the status of the QRadioButton in the slot:
code :
self.select_button.clicked.connect(self.printstuff)
def printstuff(self):
    if self.versuch_2_radio.isChecked():
        print("connected")
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