我在PyQt中创建了一个应用程序,其中我有一个复选框列表,我使用QStandardItemModel和QStandardItem创建它,它完美地运行。我想将列表中的第一项连接到函数的“全选”复选框。此功能应该能够检查列表中的所有其他项目。我试图通过以下代码执行此操作:
model = QStandardItemModel(list)
item = QStandardItem("Select all")
model.appendRow(item)
item.setCheckable(True)
model.itemChanged.connect(state_changed)
def state_changed(item):
print ("Hello")
我已经从SQL查询的输出中向列表中添加了更多项目,我可以看到打印出“Hello”,而不管我单击哪个复选框。这是我的全部代码:
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtSql import *
def main():
db = QSqlDatabase.addDatabase("QODBC")
db.setHostName('LAPTOP-B79DRPA3')
db.setDatabaseName('local')
db.open()
if (db.open()==False):
QMessageBox.critical(None, "Database Error",
db.lastError().text())
query = QSqlQuery ()
query.exec_ ("select id from [Sarah].[dbo].fraga")
list = QListView()
model = QStandardItemModel(list)
item = QStandardItem("Select all")
model.appendRow(item)
item.setCheckable(True)
model.itemChanged.connect(state_changed)
while (query.next()):
item1 = QStandardItem(str(query.value(0)))
model.appendRow(item1)
item1.setCheckable(True)
list.setModel(model)
list.show()
return app.exec_()
def state_changed(item):
print ("Hello")
if __name__ == '__main__':
app = QApplication(sys.argv)
list = QListView()
model = QStandardItemModel(list)
main()
如何确保仅在“全选”状态发生变化时才调用该函数?
答案 0 :(得分:1)
连接到QAbstractItemModel.itemChanged
信号,而不是连接到QAbstractItemView.clicked
信号,该信号指定单击的索引。另外,建议不要命名变量list
,因为它会干扰内置list
。
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtSql import *
def main():
db = QSqlDatabase.addDatabase("QODBC")
db.setHostName('LAPTOP-B79DRPA3')
db.setDatabaseName('local')
db.open()
if (db.open()==False):
QMessageBox.critical(None, "Database Error",
db.lastError().text())
query = QSqlQuery ()
query.exec_ ("select id from [Sarah].[dbo].fraga")
list_view = QListView()
model = QStandardItemModel(list_view)
item = QStandardItem("Select all")
model.appendRow(item)
item.setCheckable(True)
list_view.clicked.connect(state_changed)
while (query.next()):
item1 = QStandardItem(str(query.value(0)))
model.appendRow(item1)
item1.setCheckable(True)
list_view.setModel(model)
list_view.show()
return app.exec_()
def state_changed(index):
row = index.row()
if row == 0:
print ("Hello")
if __name__ == '__main__':
app = QApplication(sys.argv)
list_view = QListView()
model = QStandardItemModel(list)
main()