如何在 PyQt4 中连接 QTreeWidget 和 QStackedWidget? [英] How to connect QTreeWidget and QStackedWidget in PyQt4?

问题描述

抱歉，我只是 Python 初学者.我只想通过 QTreeWidget 的项目单击来更改 QStackedWidget 的索引.我在网上搜索了SIGNAL和SLOT的教程，都无法解决问题.QTreeWidget 信号和 QStackedWidget 槽中的参数未拟合.

I'm sorry but just a beginner of Python. I just want to change index of QStackedWidget by the item click of QTreeWidget. I searched for the tutorials of SIGNAL and SLOT online, but just cannot solve the problem. The parameters in QTreeWidget signal and QStackedWidget slot are not fitted.

self.connect(qtree, QtCore.SIGNAL("itemClicked(QTreeWidgetItem*,int)"), stack, QtCore.SLOT("setCurrentIndex(int)"))

我试过这个:

qtree.itemClicked.connect(stack.setCurrentIndex)

它只是显示错误:

TypeError: setCurrentIndex(self, int): argument 1 has unexpected type 'QTreeWidgetItem'

我觉得可能有方法，但是我在网络上找不到.

I think there may be a method, but I cannot find on the network.

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_()

当将 QTreeWidget 更改为 StockDialog 类中的 QListWidget 时，它起作用了.

When change the QTreeWidget to the QListWidget in StockDialog class, it works.

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，我该怎么做?

Now, I want to do this with QTreeWidget, how can I do?

推荐答案

解决这个问题的策略是在QTreeWidgetItem中保存每个widget关联的索引信息.QTreeWidgetItem 有 setData() 方法允许我们在项目中保存信息，在这种情况下我们将保存索引.每次通过 addWidget()，所以总而言之，我们将执行以下操作:

The strategy to solve this problem is to save the index information associated with each widget in the QTreeWidgetItem. QTreeWidgetItem has the setData() method that allows us to save information in the item and in this case we will save the index. The index is returned every time you add a widget to QStackedWidget through addWidget(), so in summary we will do the following:

treeitem1.setData(0, Qt.UserRole, stack.addWidget(stackworkspace))
treeitem2.setData(0, Qt.UserRole, stack.addWidget(stackabout))

连接后itemClickedQTreeWidget 的信号，这将返回被按下的列和项目，根据这些信息，我们获得 QStackedWidget 索引，我们通过函数 data():

After connecting the itemClicked signal of QTreeWidget, this returns the column and the item pressed, with this information we obtain the QStackedWidget index for it we recover the data saved through the function 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)

可以在以下部分找到必要的代码:

The necessary code can be found in the following section:

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)

这篇关于如何在 PyQt4 中连接 QTreeWidget 和 QStackedWidget?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！