Question

有一个Qtreeview填充了字典中的数据，当在此树视图上更改选择时，QLabel上会显示一些数据。

当字典更新时（通过双击另一个Qtreeview），我调用最初将数据加载到Qtreeview的函数。显示了新数据，但selectionChanged不再起作用。

我做错了什么？

#!/usr/bin/env python -tt
# -*- coding: utf-8 -*-
#from PySide.QtGui import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *

import sys
reload(sys)
sys.setdefaultencoding('utf8')

data_for_tree = {"tomato":{"color":"red","ammount":"10", "note":"a note for tomato","price":"0.8"},"banana":{"color":"yellow","ammount":"1", "note":"b note for banana", "price":".6"}, "some fruit":{"color":"unknown","ammount":"100", "note":"some text","price":"2.1"}}
data_for_receiver = {"1":{"name":"milk","price":"3.2","note":"I love milk"}, "2":{"name":"coca-cola","price":".8","note":"coke forever"}}

class ProxyModel(QSortFilterProxyModel):

    def __init__(self, parent=None):
        super(ProxyModel, self).__init__(parent)

    def lessThan(self, left, right):
        leftData = self.sourceModel().data(left)
        rightData = self.sourceModel().data(right)
        try:
            return float(leftData) < float(rightData)
        except ValueError:
            return leftData < rightData

class MainFrame(QWidget):
    def __init__(self):
        QWidget.__init__(self)
        self.infoLable = QLabel()
        self.MyTreeView = QTreeView()
        self.MyTreeViewModel = QStandardItemModel()
        self.MyTreeView.setModel(self.MyTreeViewModel)
        self.most_used_cat_header = ['Name', "ammount", "color"]
        self.MyTreeViewModel.setHorizontalHeaderLabels(self.most_used_cat_header)
        self.MyTreeView.setSortingEnabled(True)
        self.MyTreeView_Fill()
        self.receiver_tree = QTreeView()
        self.receiver_model = QStandardItemModel()
        self.receiver_tree.setModel(self.receiver_model)
        self.receiver_tree_header = ['#','Name', "price"]
        self.receiver_model.setHorizontalHeaderLabels(self.receiver_tree_header)
        self.MyTreeView.doubleClicked.connect(self.addToReceiver)
        self.receiver_tree.selectionModel().selectionChanged.connect(self.showInfo)
        self.receiver_fill()

        MainWindow = QVBoxLayout(self)    
        MainWindow.addWidget(self.infoLable)
        MainWindow.addWidget(self.MyTreeView)
        MainWindow.addWidget(self.receiver_tree)
        self.setLayout(MainWindow)
    def showInfo(self):
        indexes = self.receiver_tree.selectedIndexes()
        index_list =[i.data() for i in     self.receiver_tree.selectedIndexes()]
        name = index_list[1]
        price = index_list[2]
        txt = str(name) + " " + str(price)
        self.infoLable.setText(txt)
    def addToReceiver(self):
        indexes = self.MyTreeView.selectedIndexes()
        index_list =[i.data() for i in     self.MyTreeView.selectedIndexes()]
        last_id = max(int(i) for i in data_for_receiver)
        for k in data_for_tree:
            v = data_for_tree[k]
            if [k,v["ammount"],v["color"]] == index_list:
                i =QStandardItem(str(last_id+1))
                name = QStandardItem(k)
                price = QStandardItem(format(float(v["price"]), ".2f"))
                tooltip = v["note"]
                name.setToolTip(tooltip)
                item = ( i, name, price)
                #self.receiver_model.appendRow(item)
                upd  = {"name":k,"price":v["price"],"note":v["note"]}
                data_for_receiver[str(last_id+1)] = upd
                self.receiver_model = QStandardItemModel()
                self.receiver_tree.setModel(self.receiver_model)
                self.receiver_fill()

    def MyTreeView_Fill(self):
        for k in data_for_tree:
            name = QStandardItem(k)
            ammount = QStandardItem(data_for_tree[k]["ammount"])
            note = QStandardItem(data_for_tree[k]["color"])
            name.setEditable(False)
            tooltip = "price "+format(float(data_for_tree[k]["price"]), ".2f")+"<br>"
            tooltip += data_for_tree[k]["note"]
            item = (name, ammount, note)
            name.setToolTip(tooltip)
            self.MyTreeViewModel.appendRow(item)
        self.MyTreeView.sortByColumn(1, Qt.DescendingOrder)
        proxyModel = ProxyModel(self)
        proxyModel.setSourceModel(self.MyTreeViewModel)
        self.MyTreeView.setModel(proxyModel)
        c = 0
        while c < len(self.most_used_cat_header):
            self.MyTreeView.resizeColumnToContents(c)
            c=c+1

    def receiver_fill(self):
        for k in data_for_receiver:
            v = data_for_receiver[k]
            i = QStandardItem(k)
            name = QStandardItem(v["name"])
            price = QStandardItem(format(float(v["price"]), ".2f"))
            tooltip = v["note"]
            name.setToolTip(tooltip)
            item = (i,name, price)
            self.receiver_model.appendRow(item)
        c = 0
        while c < len(self.receiver_tree_header):
            self.receiver_tree.resizeColumnToContents(c)
            c=c+1

if __name__ == "__main__":
    app = QApplication(sys.argv)
    main = MainFrame()
    main.show()
    main.move(app.desktop().screen().rect().center() -     main.rect().center())
    sys.exit(app.exec_())

Answer 1

原因是您每次都在QStandardItemModel创建并设置新的addToReceiver。 QAbstractItemView::setModel方法文档说它会导致视图重新创建选择模型，并且信号连接会丢失。您应该使用self.receiver_model.clear()代替并删除setModel来电。

Qt selectionChanged在数据重新加载到qtreeview后停止工作

1 个答案: