Python - QTableWidget.selectedRanges() 选中时返回多个范围

Question

我刚开始学Python，正在开发一个带有表格的图形界面。这个表格应该可以通过右键菜单连接行和列。这个功能是可以用的。
我可以通过按住Ctrl键并点击鼠标左键来选择多行。

但是，如果表格中已经有一个或多个合并单元格，而我想再添加更多的合并单元格，QTableWidget.selectedRanges()会返回n*m个选择范围，如果我选择了n行m列的区域。
举个例子，如果我在一列中选择了3行，那么就会有3个选择范围。

在控制台上会显示3次

QTableView::setSpan: single cell span won't be added

我安装的是Python 2.7.5+

谢谢，再见。

编辑于2014年3月17日

这里是我这个小程序的完整代码。

程序文件.py

import sys
from PyQt4 import QtGui, QtCore
from tableGui import Ui_Dialog as Dlg


class MarkDownTableGui(QtGui.QDialog,Dlg):
  def __init__(self):
    QtGui.QDialog.__init__(self)
    self.setupUi(self)
    ColumnCount = None
    ColumnRow = None    
    # Context menu connect cell/reset connected/selected cells
    self.menu = QtGui.QMenu()           
    self.menu.addAction("Connect",self.addSpan)
    self.menu.addAction("Reset",self.resetConnected)     

    self.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)

    self.customContextMenuRequested.connect(self.showContextMenu)            
    self.connect(self.generateButton,QtCore.SIGNAL("clicked()"),self.onGenerate)

  def onGenerate(self):    
    """
      Generate a m x n table
    """
    self.tableWidget.setRowCount(self.RowCount.value())
    self.tableWidget.setColumnCount(self.ColumnCount.value())

  def addSpan(self):    
    selectedElements = self.tableWidget.selectedRanges()       

    for slrange in selectedElements:      
      self.tableWidget.setSpan(slrange.topRow(),slrange.leftColumn(),slrange.rowCount(),slrange.columnCount())  


  def showContextMenu(self,pos):             
    self.menu.exec_(QtGui.QCursor.pos())    

  def resetConnected(self):
    #TODO
    print "TODO"


app = QtGui.QApplication(sys.argv)
dialog = MarkDownTableGui()
dialog.show()
sys.exit(app.exec_())

这是由pyuic4生成的tableGui.py

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'dialog_Table.ui'
#
# Created: Mon Mar 17 08:59:43 2014
#      by: PyQt4 UI code generator 4.10.3
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName(_fromUtf8("Dialog"))
        Dialog.setWindowModality(QtCore.Qt.ApplicationModal)
        Dialog.resize(509, 426)
        Dialog.setModal(True)
        self.buttonBox = QtGui.QDialogButtonBox(Dialog)
        self.buttonBox.setGeometry(QtCore.QRect(140, 370, 341, 32))
        self.buttonBox.setOrientation(QtCore.Qt.Horizontal)
        self.buttonBox.setStandardButtons(QtGui.QDialogButtonBox.Cancel|QtGui.QDialogButtonBox.Ok)
        self.buttonBox.setObjectName(_fromUtf8("buttonBox"))
        self.ColumnCount = QtGui.QSpinBox(Dialog)
        self.ColumnCount.setGeometry(QtCore.QRect(90, 10, 51, 23))
        self.ColumnCount.setMinimum(1)
        self.ColumnCount.setProperty("value", 5)
        self.ColumnCount.setObjectName(_fromUtf8("ColumnCount"))
        self.labelChapterCount = QtGui.QLabel(Dialog)
        self.labelChapterCount.setGeometry(QtCore.QRect(10, 10, 74, 23))
        self.labelChapterCount.setObjectName(_fromUtf8("labelChapterCount"))
        self.RowCount = QtGui.QSpinBox(Dialog)
        self.RowCount.setGeometry(QtCore.QRect(250, 10, 51, 23))
        self.RowCount.setMinimum(1)
        self.RowCount.setProperty("value", 5)
        self.RowCount.setObjectName(_fromUtf8("RowCount"))
        self.labelChapterCount_2 = QtGui.QLabel(Dialog)
        self.labelChapterCount_2.setGeometry(QtCore.QRect(160, 10, 74, 23))
        self.labelChapterCount_2.setObjectName(_fromUtf8("labelChapterCount_2"))
        self.generateButton = QtGui.QPushButton(Dialog)
        self.generateButton.setGeometry(QtCore.QRect(340, 10, 111, 24))
        self.generateButton.setObjectName(_fromUtf8("generateButton"))
        self.tableWidget = QtGui.QTableWidget(Dialog)
        self.tableWidget.setGeometry(QtCore.QRect(0, 40, 491, 321))
        self.tableWidget.setSelectionMode(QtGui.QAbstractItemView.ExtendedSelection)
        self.tableWidget.setRowCount(5)
        self.tableWidget.setColumnCount(5)
        self.tableWidget.setObjectName(_fromUtf8("tableWidget"))

        self.retranslateUi(Dialog)
        QtCore.QObject.connect(self.buttonBox, QtCore.SIGNAL(_fromUtf8("accepted()")), Dialog.accept)
        QtCore.QObject.connect(self.buttonBox, QtCore.SIGNAL(_fromUtf8("rejected()")), Dialog.reject)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        Dialog.setWindowTitle(_translate("Dialog", "Table editor", None))
        self.labelChapterCount.setText(_translate("Dialog", "Column", None))
        self.labelChapterCount_2.setText(_translate("Dialog", "Rows", None))
        self.generateButton.setText(_translate("Dialog", "generate Table", None))

问题

程序运行时，你可以通过按住左键来选择单元格
左键点击会打开右键菜单
选择连接，创建一个合并的列/行
如果我想添加额外的合并单元格，并再次从第一步开始，那么我会收到这个消息：

QTableView::setSpan: 单个单元格的合并不会被添加

我的问题是，为什么selectedRanges()返回的是一个包含n个选择范围的列表，而不是只有一个选择范围。我看过QTableWidget和QTableSelectionRange的文档，但还是没有任何头绪。

gui 表格操作合并单元格 qt qtablewidget 右键菜单选择范围控件事件

Python - QTableWidget.selectedRanges() 选中时返回多个范围

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