PyQt4 类之间的信号传递

Question

我有一组类，它们都是从同一个父类派生出来的，这些类在一个QTableWidget中作为数据单元格使用（所以它们都是从QItemDelegate派生的）。

我想创建一个信号，让这些类可以向控制器传递数据变化的信息。

尽管我进行了很多实验和阅读，但我还是找不到合适的组合来实现这个功能。以下是我的类结构：

基础类：

class Criteria(QItemDelegate):
    def bind(self, update):
        self.connect(self,SIGNAL("criteriaChange(int,  int, QVariant)"),update)    

    def emitCommitData(self):
        self.emit(SIGNAL("criteriaChange(int,  int, QVariant)"), self.Row, self.Col, self.getValue())

示例子类（只包含相关部分——如果需要更多信息请告诉我）：

class YesNo(Criteria):
    ....
    def createEditor(self, parent, option, index):
        self.comboBox = QComboBox(parent)
        for item in self.getChoices():
            self.comboBox.addItem(item)
        self.comboBox.activated.connect(self.emitCommitData) 
        return self.comboBox
    ....

这是我主类的相关部分：

@pyqtSlot(int,  int, QVariant,  name='criteriaChanged')
def setItem(self,  row,  col,  item):
    print row, col, item.toString()     # TODO:  Remove when tested
    self.Data[row][col] = item.toString()

def addCriteria(self, row, cname, ctype):
    self.setDirty()
    c = YesNo(cname, "YesNo")
    c.bind(self.setItem)

上面的代码出现了“底层的C++对象已被删除”的错误。我尝试过这个：

def addCriteria(self, row, cname, ctype):
    self.setDirty()
    c = YesNo(cname, "YesNo")
    self.connect(c,SIGNAL("criteriaChange(int,  int, QVariant)"),self.setItem)

有什么建议吗？我不一定要使用这种方法，但我需要一种方式来从各个控件中获取数据。

谢谢！

迈克

Answer 1

criteria.py

def criteria_change(row, col, new_value):
    print "change at", row, col, "new_value:", new_value

class Criteria:
    def __init__(self, row, col):
        self.row, self.col = row, col

    def on_change(self):
        criteria_change(self.row, self.col, self.value())

yes_no_maybe.py

from PyQt4.QtGui import *

from criteria import Criteria

class YesNoMaybe(Criteria):
    def create_editor(self):
        group_box = QGroupBox()
        layout = QVBoxLayout()
        group_box.setLayout(layout)
        self.buttons = []

        for s in ["yes", "no", "maybe"]:
            button = QRadioButton(s)
            self.buttons.append(button)
            layout.addWidget(button)
            button.toggled.connect(self.on_toggle)

        return group_box
    #

    def on_toggle(self, is_now_on):
        if is_now_on:
            self.on_change()

    def value(self):
        for button in self.buttons:
            if button.isChecked():
                return button.text()
#

yes_no.py

from PyQt4.QtGui import QComboBox

from criteria import Criteria

class YesNo(Criteria):
    def create_editor(self):    
        combo_box = self.combo_box = QComboBox()
        for s in ["red", "blue"]:
            combo_box.addItem(s)
        combo_box.activated.connect(self.on_change) 
        return combo_box
    #

    def value(self):
        return self.combo_box.currentText()
#

main.py

import sys

from PyQt4.QtGui import *

from yes_no_maybe import YesNoMaybe
from yes_no import YesNo

app = QApplication(sys.argv)


table_classes = [[YesNo, YesNo],
                 [YesNoMaybe, YesNoMaybe]]  

table = QTableWidget(len(table_classes), len(table_classes[0]))
table.criteria = []
for r, cls_row in enumerate(table_classes):
    criteria_row = []
    table.criteria.append(criteria_row)
    for c, criteria_cls in enumerate(cls_row):
        criteria = criteria_cls(r, c)
        criteria_row.append(criteria)
        table.setCellWidget(r, c, criteria.create_editor())

table.setRowHeight(1, 100)
table.show()

app.exec_()

Answer 2

我对此感到非常尴尬。希望这能帮助到其他人。

我没有为合适的对象调用Qt的初始化：

class YesNo(Criteria):
    def __init__(self,  name,  ctype):
        Criteria.__init__(self)            # <<<<----- This was missing before
        self.Name = name
        self.Index = ctype

还有

class Criteria(QItemDelegate):
    def __init__(self):
        QItemDelegate.__init__(self)       # <<<<----- This was missing before