port_button.py

import sys

from PySide2.QtWidgets import QPushButton, QMenu
from PySide2.QtCore import Qt, Signal

class PortButton(QPushButton):
    connectionRequested = Signal(QPushButton)
    moved = Signal()
    def __init__(self, name, operation, window, parent=None):
        self.pressed = False
        self.window = window
        self.operation = operation
        self.clicked = 0
        super(PortButton, self).__init__(name, operation)

    def contextMenuEvent(self, event):
        menu = QMenu()
        menu.addAction("Connect", lambda: self.connectionRequested.emit(self))
        menu.exec_(self.cursor().pos())

    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.clicked += 1
            if self.clicked == 1:
                self.setStyleSheet("background-color: grey")
                self.pressed = True
                self.window.pressed_ports.append(self)
            elif self.clicked == 2:
                self.setStyleSheet("background-color: white")
                self.pressed = False
                self.clicked = 0
                self.window.pressed_ports.remove(self)
        super(PortButton, self).mousePressEvent(event)

    def mouseReleaseEvent(self, event):
        super(PortButton, self).mouseReleaseEvent(event)