Qtoolbutton available signal

1、 Except those inherited from the parent class , And its own independent signals .

Rewrote triggered() Method , There are also differences in call parameters ; When you click on a action This signal will be triggered , And will acion Objects are passed .

Act on your own signals and tb Like signals sent from the outside ( Type of parameter sent QAciton).

2、 You can bind some data to a given behavior ：setData（）, Different behaviors bind different data , Access method usage action.data() Method . Than calling directly clicked.connect() Simple method .

import sys
from PyQt5.Qt import *

#  Make it into an activity module , Easy to modify 
# 1、 Create application , You can pass parameters to app, Enter parameters from the command line 
app = QApplication(sys.argv)
window = QWidget()
window.setWindowTitle("QToolButton Use ")
window.resize(500, 500)

tb = QToolButton(window)
tb.setText(" Button ")
tb.setArrowType(Qt.LeftArrow)
tb.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
tb.setAutoRaise(True)

menu = QMenu(tb)
menu.setTitle(" menu ")
#  Put submenus and actions in the menu 

sub_menu = QMenu(menu)
sub_menu.setTitle(" Sub menu ")

#  Put in meun In parent object 
action = QAction(" Behavior ", menu)
action.setData([1,2,3])
#  monitor action Signal in 
#action.triggered.connect(lambda : print(" Clicked behavior "))
menu.addMenu(sub_menu)
menu.addSeparator()
menu.addAction(action)

tb.clicked.connect(lambda: print(" The tool button is clicked "))
tb.setMenu(menu)

#  Relevant action object 
def do_action(action):
    print(" Clicked behavior 2", action.data())

tb.triggered.connect(do_action)

#  Modify the popup method of the menu 
tb.setPopupMode(QToolButton.InstantPopup)
window.show()
sys.exit(app.exec_())