Qt Signal Slot Custom Class

Qt documentation: Multi window signal slot connection. A simple multiwindow example using signals and slots. There is a MainWindow class that controls the Main Window view. For example if you want to link a value changed event then you would emit a signal from within the class and then use that signal with the QObject::connect to link to a slot within class as well. I have created a class called EmitterTest that has a function within it called.

1. Qt Connect Class Slots To Designer Signals
2. Qt Signal Slot Thread
3. Qt Signal Slot Example

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Qt Connect Class Slots To Designer Signals

#!/usr/bin/env python

# coding: utf-8

# 예제 내용

# * 시그널 선언시 인자 타입을 선언 후 값 전달하기

import sys

from PyQt5.QtWidgets import QWidget

from PyQt5.QtWidgets import QLabel

from PyQt5.QtWidgets import QApplication

from PyQt5.QtWidgets import QBoxLayout

from PyQt5.QtCore import Qt

from PyQt5.QtCore import QThread

from PyQt5.QtCore import pyqtSignal

import string

import time

import random

__author__ ='Deokyu Lim <hong18s@gmail.com>'

classOtpTokenGenerator(QThread):

''

1초마다 남은 시간

5초마다 변화된 OTP 코드를 시그널로 전달

''

# 사용자 정의 시그널 선언

value_changed = pyqtSignal(str, name='ValueChanged')

expires_in = pyqtSignal(int, name='ExpiresIn')

EXPIRE_TIME=5

def__init__(self):

QThread.__init__(self)

self.characters =list(string.ascii_uppercase)

self.token =self.generate()

def__del__(self):

self.wait()

defgenerate(self):

random.shuffle(self.characters)

return''.join(self.characters[0:5])

defrun(self):

''

토큰 값과 남은 시간을 실시간으로 전송(emit)한다.

:return:

''

self.value_changed.emit(self.token) # 시작 후 첫 OTP코드 전달

whileTrue:

t =int(time.time()) %self.EXPIRE_TIME

self.expires_in.emit(self.EXPIRE_TIME- t) # 남은 시간을 전달

if t !=0:

self.usleep(1)

continue

# 바뀐 토큰 값을 전달

self.token =self.generate()

self.value_changed.emit(self.token)

self.msleep(1000)

classForm(QWidget):

def__init__(self):

QWidget.__init__(self, flags=Qt.Widget)

self.lb_token = QLabel()

self.lb_expire_time = QLabel()

self.otp_gen = OtpTokenGenerator()

self.init_widget()

self.otp_gen.start()

definit_widget(self):

self.setWindowTitle('Custom Signal')

form_lbx = QBoxLayout(QBoxLayout.TopToBottom, parent=self)

self.setLayout(form_lbx)

# 시그널 슬롯 연결

self.otp_gen.ValueChanged.connect(self.lb_token.setText)

self.otp_gen.ExpiresIn.connect(lambdav: self.lb_expire_time.setText(str(v)))

form_lbx.addWidget(self.lb_token)

form_lbx.addWidget(self.lb_expire_time)

if__name__'__main__':

app = QApplication(sys.argv)

form = Form()

form.show()

exit(app.exec_())

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Overview

In the Custom Type Example, we showed how to integrate custom types with the meta-object system, enabling them to be stored in QVariant objects, written out in debugging information and used in signal-slot communication.

In this example, we demonstrate that the preparations made to the Message class and its declaration with Q_DECLARE_METATYPE() enable it to be used with direct signal-slot connections. We do this by creating a Window class containing signals and slots whose signatures include Message arguments.

The Window and Message Class Definitions

We define a simple Window class with a signal and public slot that allow a Message object to be sent via a signal-slot connection:

The window will contain a text editor to show the contents of a message and a push button that the user can click to send a message. To facilitate this, we also define the sendMessage() slot. We also keep a Message instance in the thisMessage private variable which holds the actual message to be sent.

The Message class is defined in the following way:

The type is declared to the meta-type system with the Q_DECLARE_METATYPE() macro:

This will make the type available for use in direct signal-slot connections.

The Window Class Implementation

The Window constructor sets up a user interface containing a text editor and a push button.

The button's clicked() signal is connected to the window's sendMessage() slot, which emits the messageSent(Message) signal with the Message held by the thisMessage variable:

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Torrent files slot games downloads. We implement a slot to allow the message to be received, and this also lets us set the message in the window programatically:

In this function, we simply assign the new message to thisMessage and update the text in the editor.

Making the Connection

In the example's main() function, we perform the connection between two instances of the Window class:

We set the message for the first window and connect the messageSent(Message) signal from each window to the other's setMessage(Message) slot. Since the signals and slots mechanism is only concerned with the type, we can simplify the signatures of both the signal and slot when we make the connection.

When the user clicks on the Send message button in either window, the message shown will be emitted in a signal that the other window will receive and display.

Further Reading

Although the custom Message type can be used with direct signals and slots, an additional registration step needs to be performed if you want to use it with queued signal-slot connections. See the Queued Custom Type Example for details.

More information on using custom types with Qt can be found in the Creating Custom Qt Types document.

Qt Signal Slot Thread

Files:

Qt Signal Slot Example

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