以编程方式单击QGroupBox

Question

这是我这个问题的后续：使QGroupBox可选择并可点击

我的相关问题是，如何在启动时以编程方式点击第一个组？

我尝试在实现原始问题中提供的解决方案后这样做，使用：

scrollLayout.itemAt(0).widget().click()

然而，这并没有奏效。我错过了什么？

Answer 1

试试看：

from PyQt5 import QtWidgets, QtGui, QtCore

class GroupBox(QtWidgets.QGroupBox):                  
clicked = QtCore.pyqtSignal(str, object)     
def __init__(self, title):              
super(GroupBox, self).__init__()
self.title = title
self.setTitle(self.title)
def mousePressEvent(self, event):
child = self.childAt(event.pos())
if not child:
child = self
self.clicked.emit(self.title, child)            

class MainWindow(QtWidgets.QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
w = QtWidgets.QWidget()
layout = QtWidgets.QVBoxLayout()
w.setLayout(layout)
self.setCentralWidget(w)
my_tree = QtWidgets.QTreeWidget()
layout.addWidget(my_tree)
alpha = QtWidgets.QTreeWidgetItem(my_tree, ['Alpha'])
beta = QtWidgets.QTreeWidgetItem(my_tree, ['Beta'])
alpha.addChild(QtWidgets.QTreeWidgetItem(['one']))
alpha.addChild(QtWidgets.QTreeWidgetItem(['two']))
beta.addChild(QtWidgets.QTreeWidgetItem(['first']))
beta.addChild(QtWidgets.QTreeWidgetItem(['second']))
my_tree.expandAll()
alpha.child(0).setSelected(True)
scroll = QtWidgets.QScrollArea()
layout.addWidget(scroll)
scrollLayout = QtWidgets.QVBoxLayout()
scrollW = QtWidgets.QWidget()
scroll.setWidget(scrollW)
scrollW.setLayout(scrollLayout)
scrollLayout.setAlignment(QtCore.Qt.AlignTop)
scroll.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
scroll.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
scroll.setWidgetResizable(True)
for _ in range(5):
fooGroup = GroupBox(f'GroupBox_{_}')                                     
fooGroup.setObjectName(f'fooGroup {_}')
fooGroup.clicked.connect(self.onFooGroupClick)                 
fooLayout = QtWidgets.QVBoxLayout()
fooGroup.setLayout(fooLayout)
fooItem1 = QtWidgets.QLabel("fooItem1", objectName="fooItem1")
fooItem1.setStyleSheet('background: #44ffff')
fooItem2 = QtWidgets.QLabel("fooItem2", objectName="fooItem2")
fooItem2.setStyleSheet('background: #ffff56;')
fooItem3 = QtWidgets.QLabel("fooItem3", objectName="fooItem3")
fooItem3.setStyleSheet('background: #ff42ff;')
fooLayout.addWidget(fooItem1)
fooLayout.addWidget(fooItem2)
fooLayout.addWidget(fooItem3)
scrollLayout.addWidget(fooGroup)
#        scrollLayout.itemAt(0).widget().click()                             # ---  
_fooGroup = scrollLayout.itemAt(0).widget()                          # +++
_fooGroup.clicked.emit('GroupBox_0', _fooGroup)                      # +++
def onFooGroupClick(self, title, obj):                                
print(f"Group: {title}; objectName=`{obj.objectName()}`") 

if __name__ == '__main__':
app = QtWidgets.QApplication([])
window = MainWindow()
window.show()
app.exec_()