python - 为什么我的对话框类相互写入？

Question

我正在开发一个将用于时间运动研究的程序。有时用户可能必须创建新对象(观察者、受试者、诊所)。为了实现这一点，我使用了模式对话框(因为所有数据都与受试者、观察者和诊所相关联)。

我已经为对话框创建了一个通用类，然后为每个对话框创建了一个此类的实例。但是，当用户创建一个包含一个类的新条目，然后再创建另一个类时，将再次创建先前的类输入，从而导致数据重复。

我不太确定发生了什么，正在寻求帮助:

这是我的通用对话框类:

class NewDataDialog(wx.Dialog):
def __init__(self, parent, id, title, databoxes, pubsubmessage):
    wx.Dialog.__init__(self,parent,id, title)

    self.databoxes = databoxes
    self.pubsubmessage = pubsubmessage
    # MainSizer Creation
    self.MainSizer = wx.BoxSizer(wx.VERTICAL)

    # Top Label Creation and addition to Main Sizer
    self.TopLbl = wx.StaticText(self, -1, "Create a " + title)
    self.TopLbl.SetFont(wx.Font(12, wx.SWISS, wx.NORMAL, wx.BOLD))
    self.MainSizer.Add(self.TopLbl, 0, wx.ALL|wx.ALIGN_CENTER, 5)

    self.SubSizer = wx.BoxSizer(wx.HORIZONTAL)

    # Labels
    self.LblSizer = wx.BoxSizer(wx.VERTICAL)

    for lbl in databoxes:
        self.lbl = wx.StaticText(self, -1, lbl+":")
        self.LblSizer.Add(self.lbl, 0, wx.ALL|wx.ALIGN_LEFT, 5)


    self.SubSizer.Add(self.LblSizer, 0, wx.ALL|wx.ALIGN_LEFT, 5)

    # Boxes
    self.InputSizer = wx.BoxSizer(wx.VERTICAL)

    for lbl in databoxes:
        self.box = wx.TextCtrl(self, -1, style=wx.ALIGN_LEFT)
        self.InputSizer.Add(self.box, 0, wx.ALL, 1)

    self.SubSizer.Add(self.InputSizer, 0, wx.ALL|wx.ALIGN_LEFT, 5)
    self.MainSizer.Add(self.SubSizer, 0, wx.ALL|wx.ALIGN_CENTER, 5)

    # Save and Cancel Buttons
    self.buttonSizer = wx.BoxSizer(wx.HORIZONTAL)
    self.saveButton = SaveButton(self, 'Save')
    self.cancelButton = CancelButton(self, 'Cancel')
    self.buttonSizer.Add(self.saveButton, 0, wx.ALL|wx.ALIGN_CENTER, 5)
    self.buttonSizer.Add(self.cancelButton, 0, wx.ALL|wx.ALIGN_CENTER, 5)

    self.MainSizer.Add(self.buttonSizer, 0, wx.ALL|wx.ALIGN_CENTER, 5)
    self.SetSizerAndFit(self.MainSizer)

    pub.subscribe(self.cancelbutton, "mainpanel.CancelButton")
    pub.subscribe(self.savebutton, "mainpanel.SaveButton")

def cancelbutton(self, message):

    self.Close()


def savebutton(self, message):

    results = []

    for lbl in self.databoxes:
        results.append(self.box.GetValue())

    pub.sendMessage(self.pubsubmessage, results)
    self.Close()

class CancelButton(wx.Panel):
    def __init__(self, parent, title):

        wx.Panel.__init__(self, parent)

        self.dialogbutton = wx.Button(self, -1, title)

        self.Bind(wx.EVT_BUTTON, self.OnButtonActivate, self.dialogbutton)


    def OnButtonActivate(self, event):

        pub.sendMessage("mainpanel.CancelButton", "")


class SaveButton(CancelButton):

    def OnButtonActivate(self, event):

        pub.sendMessage("mainpanel.SaveButton", "")

下面是对话框的每个实例的创建:

def newsubject(self, message):

    titles = ["Full Name", "Initials", "Job Title"]
    self.newsubject = NewDataDialog(self, 0, 'New Subject', titles, "MainPanel.NewSubjectDialog.Save")
    self.newsubject.ShowModal()

def newobserver(self, message):

    titles = ["Full Name", "Initials"]
    self.newobserver = NewDataDialog(self, 1, 'New Observer', titles, "MainPanel.NewObserverDialog.Save")
    self.newobserver.ShowModal()

def newclinic(self, message):

    titles = ["Clinic Name","Location","Initials"]
    self.newclinic = NewDataDialog(self, 2, 'New Clinic', titles, "MainPanel.NewClinicDialog.Save")
    self.newclinic.ShowModal()

如果用户选择一个标记为他们想要的操作的按钮，则调用其中的每一个。 IE。 “创建新观察者”将运行函数 newobserver

有关代码的完整 View ，您可以查看 here . 注意:并非所有评论都被正确注释，还有其他文件作为其中的一部分，因此不会运行，但希望能让您更深入地了解正在发生的事情

Answer 1

您正在 self.newsubject、self.newobserver 和 self.newclinic 中存储对 NewDataDialog 实例的引用>。这意味着对象继续存在，并监听 "mainpanel.SaveButton" 事件，即使在 newsubject、newobserver 和 newclinic 方法退出。一旦您打开了每种对话框中的一个，总会有三个这样的对象卡在周围，每个 "mainpanel.SaveButton" 事件都会导致所有三个对象尝试保存它们的数据。

如果您没有存储这些引用，那么这些对象将 apparently被垃圾收集，并自动删除订阅。如果您确实需要存储引用，那么您应该在 ShowModal() 之后安排一个unsubscribe。

def cancelbutton(self, message):

    pub.unsubscribe(self.savebutton, "mainpanel.SaveButton")
    pub.unsubscribe(self.cancelbutton, "mainpanel.CancelButton")
    self.Close()


def savebutton(self, message):

    results = []

    for lbl in self.databoxes:
        results.append(self.box.GetValue())

    pub.sendMessage(self.pubsubmessage, results)
    pub.unsubscribe(self.savebutton, "mainpanel.SaveButton")
    pub.unsubscribe(self.cancelbutton, "mainpanel.CancelButton")
    self.Close()