[英]How to connect QTreeWidget and QStackedWidget in PyQt4?
对不起,我只是Python的初学者。 我只想通过单击QTreeWidget来更改QStackedWidget的索引。 我在网上搜索了SIGNAL和SLOT的教程,但无法解决问题。 QTreeWidget信号和QStackedWidget插槽中的参数不适合。
self.connect(qtree, QtCore.SIGNAL("itemClicked(QTreeWidgetItem*,int)"), stack, QtCore.SLOT("setCurrentIndex(int)"))
我尝试了这个:
qtree.itemClicked.connect(stack.setCurrentIndex)
它只是显示错误:
TypeError: setCurrentIndex(self, int): argument 1 has unexpected type 'QTreeWidgetItem'
我认为可能有一种方法,但是在网络上找不到。
像这样:
from PyQt4.QtGui import *
from PyQt4.QtCore import *
import sys
class StockDialog(QDialog):
def __init__(self,parent=None):
super(StockDialog,self).__init__(parent)
mainSplitter=QSplitter(Qt.Horizontal)
treewidget = QTreeWidget(mainSplitter)
treewidget.setHeaderLabels(["Tree"])
treeroot = QTreeWidgetItem(treewidget, ["Stack"])
treeitem1 = QTreeWidgetItem(["WorkSpace"])
treeitem2 = QTreeWidgetItem(["About"])
treeroot.addChild(treeitem1)
treeroot.addChild(treeitem2)
stack=QStackedWidget(mainSplitter)
stack.setFrameStyle(QFrame.Panel|QFrame.Raised)
stackworkspace=StackWorkSpace()
stackabout=StackAbout()
stack.addWidget(stackworkspace)
stack.addWidget(stackabout)
closePushButton=QPushButton(self.tr("Close"))
self.connect(treewidget,
SIGNAL("itemClicked(int)"),
stack,SLOT("setCurrentIndex(int)"))
self.connect(closePushButton,
SIGNAL("clicked()"),
self,SLOT("close()"))
layout=QVBoxLayout(self)
layout.addWidget(mainSplitter)
layout.addWidget(closePushButton)
self.setLayout(layout)
class StackWorkSpace(QWidget):
def __init__(self,parent=None):
super(StackWorkSpace,self).__init__(parent)
widget1=QTextEdit(self.tr("WorkSpace"))
widget2=QTextEdit(self.tr("WorkSpace"))
layout=QGridLayout(self)
layout.addWidget(widget1,0,0)
layout.addWidget(widget2,0,1)
class StackAbout(QDialog):
def __init__(self,parent=None):
super(StackAbout,self).__init__(parent)
self.setStyleSheet("background: red")
app=QApplication(sys.argv)
main=StockDialog()
main.show()
app.exec_()
将QTreeWidget更改为StockDialog类中的QListWidget时,它可以工作。
class StockDialog(QDialog):
def __init__(self,parent=None):
super(StockDialog,self).__init__(parent)
mainSplitter=QSplitter(Qt.Horizontal)
listwidget=QListWidget(mainSplitter)
listwidget.insertItem(0,self.tr("WorkSpace"))
listwidget.insertItem(1,self.tr("About"))
stack=QStackedWidget(mainSplitter)
stack.setFrameStyle(QFrame.Panel|QFrame.Raised)
stackworkspace=StackWorkSpace()
stackabout=StackAbout()
stack.addWidget(stackworkspace)
stack.addWidget(stackabout)
closePushButton=QPushButton(self.tr("Close"))
self.connect(listwidget,
SIGNAL("currentRowChanged(int)"),
stack,SLOT("setCurrentIndex(int)"))
self.connect(closePushButton,
SIGNAL("clicked()"),
self,SLOT("close()"))
layout=QVBoxLayout(self)
layout.addWidget(mainSplitter)
layout.addWidget(closePushButton)
self.setLayout(layout)
现在,我想用QTreeWidget做到这一点,怎么办?
解决此问题的策略是将与每个窗口小部件关联的索引信息保存在QTreeWidgetItem
。 QTreeWidgetItem
具有setData()
方法,该方法允许我们将信息保存在项目中,在这种情况下,我们将保存索引。 每次通过addWidget()
将小部件添加到QStackedWidget
, addWidget()
返回该索引,因此总而言之,我们将执行以下操作:
treeitem1.setData(0, Qt.UserRole, stack.addWidget(stackworkspace))
treeitem2.setData(0, Qt.UserRole, stack.addWidget(stackabout))
连接QTreeWidget
的itemClicked
信号后,它返回列和按下的项目,并根据此信息获取QStackedWidget
索引,以恢复通过函数data()
保存的data()
:
treewidget.itemClicked.connect(lambda item, column: stack.setCurrentIndex(item.data(column, Qt.UserRole))
if item.data(column, Qt.UserRole) is not None else None)
必要的代码可以在以下部分中找到:
class StockDialog(QDialog):
def __init__(self, parent=None):
super(StockDialog, self).__init__(parent)
mainSplitter = QSplitter(Qt.Horizontal)
treewidget = QTreeWidget(mainSplitter)
treewidget.setHeaderLabels(["Tree"])
treeroot = QTreeWidgetItem(treewidget, ["Stack"])
treeitem1 = QTreeWidgetItem(["WorkSpace"])
treeitem2 = QTreeWidgetItem(["About"])
treeroot.addChild(treeitem1)
treeroot.addChild(treeitem2)
stack = QStackedWidget(mainSplitter)
stack.setFrameStyle(QFrame.Panel | QFrame.Raised)
stackworkspace = StackWorkSpace()
stackabout = StackAbout()
treeitem1.setData(0, Qt.UserRole, stack.addWidget(stackworkspace))
treeitem2.setData(0, Qt.UserRole, stack.addWidget(stackabout))
closePushButton = QPushButton(self.tr("Close"))
treewidget.itemClicked.connect(lambda item, column: stack.setCurrentIndex(item.data(column, Qt.UserRole))
if item.data(column, Qt.UserRole) is not None else None)
layout = QVBoxLayout(self)
layout.addWidget(mainSplitter)
layout.addWidget(closePushButton)
self.setLayout(layout)
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.