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PyQt4 setItemDelegateForRow导致段错误

2012-11-20 68 views
1

我试图通过使用QTableView.setItemDelegateForRow（）方法设置一个编辑器委托在我的QTableView特定于每一行数据。当我在多行上设置委托时，它会导致PyQt4出现分段错误。这似乎至少部分与使用相同的变量来存储委托类的不同实例，就像这样：PyQt4 setItemDelegateForRow导致段错误

# This code causes a segmentation fault 
delegate = ListDelegate(choices0) 
tableView.setItemDelegateForRow(0,delegate) 
delegate = ListDelegate(choices1) 
tableView.setItemDelegateForRow(1,delegate)

但是，如果我用不同的变量，它似乎正常工作，如：

# This code works to set the delegate by row 
delegate0 = ListDelegate(choices0) 
tableView.setItemDelegateForRow(0,delegate0) 
delegate1 = ListDelegate(choices1) 
tableView.setItemDelegateForRow(1,delegate1)

我有一个代码的例子，导致我将在最后包括的分段错误。我已经在Ubuntu Linux和Windows 7上（都是64位）对python 2.7进行了测试。我试图设置一个循环中的委托，并使用字典或列表来存储的代表似乎没有解决问题。

示例应用程序：

from PyQt4 import QtGui, QtCore 
import sys 

class PaletteListModel(QtCore.QAbstractListModel): 

    def __init__(self, colors = [], parent = None): 
     QtCore.QAbstractListModel.__init__(self,parent) 
     self.__colors = colors 

    # required method for Model class 
    def rowCount(self, parent): 
     return len(self.__colors) 

    # optional method for Model class 
    def headerData(self, section, orientation, role): 
     if role == QtCore.Qt.DisplayRole: 
      if orientation == QtCore.Qt.Horizontal: 
       return QtCore.QString("Palette") 
      else: 
       return QtCore.QString("Color %1").arg(section) 

     if role == QtCore.Qt.ToolTipRole: 
      if orientation == QtCore.Qt.Horizontal: 
       return QtCore.QString("Horizontal Header %s Tooltip" % str(section)) 
      else: 
       return QtCore.QString("Vertical Header %s Tooltip" % str(section)) 


    # required method for Model class 
    def data(self, index, role): 
     # index contains a QIndexClass object. The object has the following 
     # methods: row(), column(), parent() 

     row = index.row() 
     value = self.__colors[row] 

     # keep the existing value in the edit box 
     if role == QtCore.Qt.EditRole: 
      return self.__colors[row].name() 

     # add a tooltip 
     if role == QtCore.Qt.ToolTipRole: 
      return "Hex code: " + value.name() 

     if role == QtCore.Qt.DecorationRole: 
      pixmap = QtGui.QPixmap(26,26) 
      pixmap.fill(value) 

      icon = QtGui.QIcon(pixmap) 

      return icon 

     if role == QtCore.Qt.DisplayRole: 

      return value.name() 

    def setData(self, index, value, role = QtCore.Qt.EditRole): 
     row = index.row() 

     if role == QtCore.Qt.EditRole: 
      color = QtGui.QColor(value) 

      if color.isValid(): 
       self.__colors[row] = color 
       self.dataChanged.emit(index, index) 
       return True 

     return False 

    # implment flags() method 
    def flags(self, index): 
     return QtCore.Qt.ItemIsEditable | QtCore.Qt.ItemIsEnabled | QtCore.Qt.ItemIsSelectable 

class ListDelegate(QtGui.QStyledItemDelegate): 
    def __init__(self, colors = QtCore.QStringList(), parent = None): 
     #super(ListDelegate, self).__init__() 
     QtGui.QStyledItemDelegate.__init__(self,parent) 
     self.__colors = colors 
     #self.__current = current 

    def createEditor(self, parent, option, index): 
     ed = QtGui.QComboBox(parent) 
     ed.setEditable(True) 

     # add each settings option to the combobox 
     for s in self.__colors: 
      ed.addItem(s) 

     return ed 


if __name__ == '__main__': 


    app = QtGui.QApplication(sys.argv) 
    app.setStyle("plastique") 

    data = QtCore.QStringList() 
    data << "one" << "two" << "three" << "four" << "five" 

    tableView = QtGui.QTableView() 
    tableView.show() 

    red = QtGui.QColor(255,0,0) 
    green = QtGui.QColor(0,255,0) 
    blue = QtGui.QColor(0,0,255) 

    model = PaletteListModel([red, green, blue]) 

    choices0 = QtCore.QStringList(["#FF0000","#00FF00","#0000FF"]) 
    choices1 = QtCore.QStringList(["#FF0000","#0000FF"]) 

    # This code works to set the delegate by row 
    delegate0 = ListDelegate(choices0) 
    tableView.setItemDelegateForRow(0,delegate0) 
    delegate1 = ListDelegate(choices1) 
    tableView.setItemDelegateForRow(1,delegate1) 

    # This code causes a segmentation fault 
    delegate = ListDelegate(choices0) 
    tableView.setItemDelegateForRow(0,delegate) 
    delegate = ListDelegate(choices1) 
    tableView.setItemDelegateForRow(1,delegate) 

    tableView.setModel(model) 
    tableView.horizontalHeader() 

    sys.exit(app.exec_())

堆栈跟踪（从Ubuntu的框），虽然我真的不知道如何解释它：

gdb python2.7-dbg 
GNU gdb (GDB) 7.5-ubuntu 
Copyright (C) 2012 Free Software Foundation, Inc. 
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> 
This is free software: you are free to change and redistribute it. 
There is NO WARRANTY, to the extent permitted by law. Type "show copying" 
and "show warranty" for details. 
This GDB was configured as "x86_64-linux-gnu". 
For bug reporting instructions, please see: 
<http://www.gnu.org/software/gdb/bugs/>... 
Reading symbols from /usr/bin/python2.7-dbg...done. 
(gdb) run TestDelegateForRow.py 
Starting program: /usr/bin/python2.7-dbg TestDelegateForRow.py 
[Thread debugging using libthread_db enabled] 
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". 
[New Thread 0x7fffe6a78700 (LWP 12070)] 
[New Thread 0x7fffe6277700 (LWP 12071)] 
[New Thread 0x7fffe5442700 (LWP 12072)] 

Program received signal SIGSEGV, Segmentation fault. 
0x00007ffff5ca7cf8 in ??() from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
(gdb) backtrace 
#0 0x00007ffff5ca7cf8 in ??() from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#1 0x00007ffff5cb27f6 in QTableView::paintEvent(QPaintEvent*)() from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#2 0x00007ffff64f54d3 in sipQTableView::paintEvent (this=0xfbfa60, a0=0x7fffffffc0a0) at sipQtGuipart2.cpp:35590 
#3 0x00007ffff57be802 in QWidget::event(QEvent*)() from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#4 0x00007ffff5b6db66 in QFrame::event(QEvent*)() from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#5 0x00007ffff5c7959b in QAbstractItemView::viewportEvent(QEvent*)() from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#6 0x00007ffff64fbc9b in viewportEvent (a0=0x7fffffffc0a0, this=0xfbfa60) at sipQtGuipart2.cpp:36150 
#7 sipQTableView::viewportEvent (this=0xfbfa60, a0=0x7fffffffc0a0) at sipQtGuipart2.cpp:36142 
#8 0x00007ffff524a6d6 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*)() from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 
#9 0x00007ffff576ee6c in QApplicationPrivate::notify_helper(QObject*, QEvent*)() from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#10 0x00007ffff577330a in QApplication::notify(QObject*, QEvent*)() from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#11 0x00007ffff67b62a6 in notify (a1=0x7fffffffc0a0, a0=0xe31b10, this=0xcfbcb0) at sipQtGuipart9.cpp:35916 
#12 sipQApplication::notify (this=0xcfbcb0, a0=0xe31b10, a1=0x7fffffffc0a0) at sipQtGuipart9.cpp:35908 
#13 0x00007ffff524a56e in QCoreApplication::notifyInternal(QObject*, QEvent*)() from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 
#14 0x00007ffff57ba524 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*)() from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#15 0x00007ffff57bb01f in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*)() 
    from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#16 0x00007ffff57bae64 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*)() 
    from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#17 0x00007ffff57bae64 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*)() 
    from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#18 0x00007ffff57bae64 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*)() 
    from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#19 0x00007ffff57ba0b5 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*)() from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#20 0x00007ffff5988958 in ??() from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#21 0x00007ffff5988d1e in ??() from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#22 0x00007ffff57eb6aa in ??() from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#23 0x00007ffff57ec6bb in QApplication::x11ProcessEvent(_XEvent*)() from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#24 0x00007ffff5813fa2 in ??() from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#25 0x00007ffff44b7ab5 in g_main_context_dispatch() from /lib/x86_64-linux-gnu/libglib-2.0.so.0 
#26 0x00007ffff44b7de8 in ??() from /lib/x86_64-linux-gnu/libglib-2.0.so.0 
#27 0x00007ffff44b7ea4 in g_main_context_iteration() from /lib/x86_64-linux-gnu/libglib-2.0.so.0 
#28 0x00007ffff5278bf6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)() from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 
#29 0x00007ffff5813c1e in ??() from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
#30 0x00007ffff52492bf in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)() from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 
#31 0x00007ffff5249548 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)() from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 
#32 0x00007ffff524e708 in QCoreApplication::exec()() from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 
#33 0x00007ffff677762b in meth_QApplication_exec_ (sipArgs=<optimized out>) at sipQtGuipart9.cpp:37856 
#34 0x0000000000486b1a in PyCFunction_Call (func=<built-in method exec_ of QApplication object at remote 0xe891e0>, arg=(), kw=0x0) at ../Objects/methodobject.c:81 
#35 0x0000000000526610 in call_function (pp_stack=0x7fffffffd960, oparg=0) at ../Python/ceval.c:4021 
#36 0x00000000005213fb in PyEval_EvalFrameEx (f=Frame 0xb89c00, for file TestDelegateForRow.py, line 131, in <module>(), throwflag=0) at ../Python/ceval.c:2666 
#37 0x0000000000523de9 in PyEval_EvalCodeEx (co=0xcbd510, globals= 
    {'choices0': <QStringList at remote 0x10fc2e0>, 'choices1': <QStringList at remote 0x10fc380>, 'app': <QApplication at remote 0xe891e0>, 'delegate0': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe89420>, 'delegate1': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe894e0>, 'blue': <QColor at remote 0x10fc240>, 'QtGui': <module at remote 0xcd2a20>, 'data': <QStringList at remote 0x10fc060>, '__package__': None, 'ListDelegate': <PyQt4.QtCore.pyqtWrapperType at remote 0xcfb6a0>, '__doc__': None, 'red': <QColor at remote 0x10fc100>, 'tableView': <QTableView at remote 0xe892a0>, '__builtins__': <module at remote 0x7ffff7fc5470>, '__file__': 'TestDelegateForRow.py', 'sys': <module at remote 0x7ffff7fc55a8>, '__name__': '__main__', 'PaletteListModel': <PyQt4.QtCore.pyqtWrapperType at remote 0xb955b0>, 'green': <QColor at remote 0x10fc1a0>, 'delegate': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe89660>, 'model': <PaletteListModel(_PaletteListModel__colors=[<...>, <...>, <...>]) at remote ...(truncated), locals= 
    {'choices0': <QStringList at remote 0x10fc2e0>, 'choices1': <QStringList at remote 0x10fc380>, 'app': <QApplication at remote 0xe891e0>, 'delegate0': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe89420>, 'delegate1': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe894e0>, 'blue': <QColor at remote 0x10fc240>, 'QtGui': <module at remote 0xcd2a20>, 'data': <QStringList at remote 0x10fc060>, '__package__': None, 'ListDelegate': <PyQt4.QtCore.pyqtWrapperType at remote 0xcfb6a0>, '__doc__': None, 'red': <QColor at remote 0x10fc100>, 'tableView': <QTableView at remote 0xe892a0>, '__builtins__': <module at remote 0x7ffff7fc5470>, '__file__': 'TestDelegateForRow.py', 'sys': <module at remote 0x7ffff7fc55a8>, '__name__': '__main__', 'PaletteListModel': <PyQt4.QtCore.pyqtWrapperType at remote 0xb955b0>, 'green': <QColor at remote 0x10fc1a0>, 'delegate': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe89660>, 'model': <PaletteListModel(_PaletteListModel__colors=[<...>, <...>, <...>]) at remote ...(truncated), args=0x0, argcount=0, kws=0x0, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3253 
---Type <return> to continue, or q <return> to quit--- 
#38 0x0000000000519e56 in PyEval_EvalCode (co=0xcbd510, globals= 
    {'choices0': <QStringList at remote 0x10fc2e0>, 'choices1': <QStringList at remote 0x10fc380>, 'app': <QApplication at remote 0xe891e0>, 'delegate0': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe89420>, 'delegate1': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe894e0>, 'blue': <QColor at remote 0x10fc240>, 'QtGui': <module at remote 0xcd2a20>, 'data': <QStringList at remote 0x10fc060>, '__package__': None, 'ListDelegate': <PyQt4.QtCore.pyqtWrapperType at remote 0xcfb6a0>, '__doc__': None, 'red': <QColor at remote 0x10fc100>, 'tableView': <QTableView at remote 0xe892a0>, '__builtins__': <module at remote 0x7ffff7fc5470>, '__file__': 'TestDelegateForRow.py', 'sys': <module at remote 0x7ffff7fc55a8>, '__name__': '__main__', 'PaletteListModel': <PyQt4.QtCore.pyqtWrapperType at remote 0xb955b0>, 'green': <QColor at remote 0x10fc1a0>, 'delegate': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe89660>, 'model': <PaletteListModel(_PaletteListModel__colors=[<...>, <...>, <...>]) at remote ...(truncated), locals= 
    {'choices0': <QStringList at remote 0x10fc2e0>, 'choices1': <QStringList at remote 0x10fc380>, 'app': <QApplication at remote 0xe891e0>, 'delegate0': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe89420>, 'delegate1': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe894e0>, 'blue': <QColor at remote 0x10fc240>, 'QtGui': <module at remote 0xcd2a20>, 'data': <QStringList at remote 0x10fc060>, '__package__': None, 'ListDelegate': <PyQt4.QtCore.pyqtWrapperType at remote 0xcfb6a0>, '__doc__': None, 'red': <QColor at remote 0x10fc100>, 'tableView': <QTableView at remote 0xe892a0>, '__builtins__': <module at remote 0x7ffff7fc5470>, '__file__': 'TestDelegateForRow.py', 'sys': <module at remote 0x7ffff7fc55a8>, '__name__': '__main__', 'PaletteListModel': <PyQt4.QtCore.pyqtWrapperType at remote 0xb955b0>, 'green': <QColor at remote 0x10fc1a0>, 'delegate': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe89660>, 'model': <PaletteListModel(_PaletteListModel__colors=[<...>, <...>, <...>]) at remote ...(truncated)) at ../Python/ceval.c:667 
#39 0x000000000055685c in run_mod (mod=0xb91aa8, filename=0x7fffffffe374 "TestDelegateForRow.py", globals= 
    {'choices0': <QStringList at remote 0x10fc2e0>, 'choices1': <QStringList at remote 0x10fc380>, 'app': <QApplication at remote 0xe891e0>, 'delegate0': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe89420>, 'delegate1': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe894e0>, 'blue': <QColor at remote 0x10fc240>, 'QtGui': <module at remote 0xcd2a20>, 'data': <QStringList at remote 0x10fc060>, '__package__': None, 'ListDelegate': <PyQt4.QtCore.pyqtWrapperType at remote 0xcfb6a0>, '__doc__': None, 'red': <QColor at remote 0x10fc100>, 'tableView': <QTableView at remote 0xe892a0>, '__builtins__': <module at remote 0x7ffff7fc5470>, '__file__': 'TestDelegateForRow.py', 'sys': <module at remote 0x7ffff7fc55a8>, '__name__': '__main__', 'PaletteListModel': <PyQt4.QtCore.pyqtWrapperType at remote 0xb955b0>, 'green': <QColor at remote 0x10fc1a0>, 'delegate': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe89660>, 'model': <PaletteListModel(_PaletteListModel__colors=[<...>, <...>, <...>]) at remote ...(truncated), locals= 
    {'choices0': <QStringList at remote 0x10fc2e0>, 'choices1': <QStringList at remote 0x10fc380>, 'app': <QApplication at remote 0xe891e0>, 'delegate0': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe89420>, 'delegate1': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe894e0>, 'blue': <QColor at remote 0x10fc240>, 'QtGui': <module at remote 0xcd2a20>, 'data': <QStringList at remote 0x10fc060>, '__package__': None, 'ListDelegate': <PyQt4.QtCore.pyqtWrapperType at remote 0xcfb6a0>, '__doc__': None, 'red': <QColor at remote 0x10fc100>, 'tableView': <QTableView at remote 0xe892a0>, '__builtins__': <module at remote 0x7ffff7fc5470>, '__file__': 'TestDelegateForRow.py', 'sys': <module at remote 0x7ffff7fc55a8>, '__name__': '__main__', 'PaletteListModel': <PyQt4.QtCore.pyqtWrapperType at remote 0xb955b0>, 'green': <QColor at remote 0x10fc1a0>, 'delegate': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe89660>, 'model': <PaletteListModel(_PaletteListModel__colors=[<...>, <...>, <...>]) at remote ...(truncated), flags=0x7fffffffde50, arena=0x9f8ae0) at ../Python/pythonrun.c:1365 
#40 0x00000000005567e2 in PyRun_FileExFlags (fp=0xb3e1b0, filename=0x7fffffffe374 "TestDelegateForRow.py", start=257, globals= 
    {'choices0': <QStringList at remote 0x10fc2e0>, 'choices1': <QStringList at remote 0x10fc380>, 'app': <QApplication at remote 0xe891e0>, 'delegate0': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe89420>, 'delegate1': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe894e0>, 'blue': <QColor at remote 0x10fc240>, 'QtGui': <module at remote 0xcd2a20>, 'data': <QStringList at remote 0x10fc060>, '__package__': None, 'ListDelegate': <PyQt4.QtCore.pyqtWrapperType at remote 0xcfb6a0>, '__doc__': None, 'red': <QColor at remote 0x10fc100>, 'tableView': <QTableView at remote 0xe892a0>, '__builtins__': <module at remote 0x7ffff7fc5470>, '__file__': 'TestDelegateForRow.py', 'sys': <module at remote 0x7ffff7fc55a8>, '__name__': '__main__', 'PaletteListModel': <PyQt4.QtCore.pyqtWrapperType at remote 0xb955b0>, 'green': <QColor at remote 0x10fc1a0>, 'delegate': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe89660>, 'model': <PaletteListModel(_PaletteListModel__colors=[<...>, <...>, <...>]) at remote ...(truncated), locals= 
    {'choices0': <QStringList at remote 0x10fc2e0>, 'choices1': <QStringList at remote 0x10fc380>, 'app': <QApplication at remote 0xe891e0>, 'delegate0': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe89420>, 'delegate1': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe894e0>, 'blue': <QColor at remote 0x10fc240>, 'QtGui': <module at remote 0xcd2a20>, 'data': <QStringList at remote 0x10fc060>, '__package__': None, 'ListDelegate': <PyQt4.QtCore.pyqtWrapperType at remote 0xcfb6a0>, '__doc__': None, 'red': <QColor at remote 0x10fc100>, 'tableView': <QTableView at remote 0xe892a0>, '__builtins__': <module at remote 0x7ffff7fc5470>, '__file__': 'TestDelegateForRow.py', 'sys': <module at remote 0x7ffff7fc55a8>, '__name__': '__main__', 'PaletteListModel': <PyQt4.QtCore.pyqtWrapperType at remote 0xb955b0>, 'green': <QColor at remote 0x10fc1a0>, 'delegate': <ListDelegate(_ListDelegate__colors=<...>) at remote 0xe89660>, 'model': <PaletteListModel(_PaletteListModel__colors=[<...>, <...>, <...>]) at remote ...(truncated), closeit=1, flags=0x7fffffffde50) at ../Python/pythonrun.c:1351 
#41 0x0000000000555002 in PyRun_SimpleFileExFlags (fp=0xb3e1b0, filename=0x7fffffffe374 "TestDelegateForRow.py", closeit=1, flags=0x7fffffffde50) at ../Python/pythonrun.c:943 
#42 0x00000000005546b5 in PyRun_AnyFileExFlags (fp=0xb3e1b0, filename=0x7fffffffe374 "TestDelegateForRow.py", closeit=1, flags=0x7fffffffde50) at ../Python/pythonrun.c:747 
#43 0x0000000000570290 in Py_Main (argc=2, argv=0x7fffffffe068) at ../Modules/main.c:639 
#44 0x00000000004171fc in main (argc=2, argv=0x7fffffffe068) at ../Modules/python.c:23 
(gdb) ^Z

当然，任何帮助或指导将不胜感激。

来源

2012-11-20 freakinhippie

+0

我没有在Win7得到段错误。对于错误的代码，我只是让'row 0'返回到默认代理。我也很好奇，如何保持代表的“list”或“dict”没有帮助。对于示例代码，将代表存储在“列表”中使得事情很好地工作。 – Avaris

回答

2

为setItemDelegateForRow Qt文档是对这个很清楚：

Any existing row delegate for row will be removed, but not deleted. 
QAbstractItemView does not take ownership of delegate.

所以，你已经诊断您的问题，但通过它没有跟上。

段错误发生，因为有些代理正在初始化表视图之前被垃圾收集。

尝试创建一个保持其委托的内部列表表视图子类：

...  

class TableView(QtGui.QTableView): 
    def __init__(self): 
     QtGui.QTableView.__init__(self) 
     colours = [ 
      QtGui.QColor(255,0,0), 
      QtGui.QColor(0,255,0), 
      QtGui.QColor(0,0,255), 
      ] 
     self._delegates = [ 
      ListDelegate(["#FF0000","#00FF00","#0000FF"]), 
      ListDelegate(["#FF0000","#0000FF"]), 
      ] 
     for row in range(len(colours)): 
      self.setItemDelegateForRow(
       row, self._delegates[bool(row % 2)]) 
     self.setModel(PaletteListModel(colours)) 

if __name__ == '__main__': 

    app = QtGui.QApplication(sys.argv) 
    app.setStyle("plastique") 

    table = TableView() 
    table.show() 

    sys.exit(app.exec_())

来源

2012-11-21 01:19:31 ekhumoro

+0

谢谢ekhumoro！代表被垃圾收集是问题。在我对实际应用程序的测试中，它没有解决问题的原因是因为我正在初始化一个方法内的列表，并且一旦方法完成列表就被垃圾收集。 – freakinhippie

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