wxPython程序扫描

Question

我正在努力更好地理解 wxPython 'scans'。

请看下面我的代码：

import os
import wx
from time import sleep

NoFilesToCombine = 0

class PDFFrame(wx.Frame):
    def __init__(self, parent, title):
        wx.Frame.__init__(self, parent, -1, title, size=(400,400))
        panel = wx.Panel(self)
        self.Show()

        try:                        #Set values of PDFNoConfirmed to zero on 1st initialisation
            if PDFNoConfimed != 0:
                None
        except UnboundLocalError:     
            PDFNoConfimed = 0   
        try:                        #Set values of PDFNoConfirmed to zero on 1st initialisation
            if PDFNoConfirmedInitially != 0:
                None
        except UnboundLocalError:     
            PDFNoConfirmedInitially = 0   

        while ((PDFNoConfimed == 0) and (PDFNoConfirmedInitially == 0)):
            while PDFNoConfirmedInitially == 0:
                BoxInputNo = wx.NumberEntryDialog(panel, "So You Want To Combine PDF Files?", "How Many?", "Please Enter", 0, 2, 20)
                if BoxInputNo.ShowModal() == wx.ID_OK: #NumberEntryDialog Pressed OK
                    NoFilesToCombine = BoxInputNo.GetValue()
                    PDFNoConfirmedInitially = 1
                elif BoxInputNo.ShowModal() == wx.ID_CANCEL:
                    exit()
            print(NoFilesToCombine)
            ConfirmationLabel = wx.StaticText(panel, -1, label="You Have Selected " + str(NoFilesToCombine) + " Files To Combine, Is This Right?", pos=(20, 100))
            ConfirmationBoxConfirm = wx.ToggleButton(panel, label="Confirm", pos=(20, 200))
            ConfirmationBoxCancel = wx.ToggleButton(panel, label="Cancel", pos=(180, 200))
            #if ConfirmationBoxConfirm.GetValue() == 1:
            #    exit()
            if ConfirmationBoxCancel.GetValue() == 1:
                PDFNoConfirmedInitially = 0

app = wx.App()
frame = PDFFrame(None, title="Robs PDF Combiner Application")
app.MainLoop()

现在这是一项正在进行的工作，所以显然还没有完成。然而，我试图用上面的方法完成的是：

显示数字输入弹出窗口。如果用户按 'cancel' 退出应用程序（这可行但出于某种原因需要按 2 次？）。如果按确定，则：
显示在第 1 步中输入的数字，以及 2 个附加按钮。 'confirm' 还没有做任何事情，但是 'cancel' 应该带你回到第 1 步。（通过重置 PDFNoConfirmedInitially 标志）。

现在第 2 步不起作用。当我调试时，它几乎看起来好像 PDFFrame 只被扫描一次。我大概是错误的假设是，由于 app.MainLoop() 不断扫描 wx.App() 而这又会调用子框架，因此会不断扫描它？

帮助/指点/更深入的理解总是很感激，

谢谢罗布

Answer 1

1) ShowModal() 显示对话框 window 并且你使用它两次

if BoxInputNo.ShowModal() == wx.ID_OK:

和

elif BoxInputNo.ShowModal() == wx.ID_CANCEL:

所以它会显示您的 window 两次。

并且只有在第二次检查 wx.ID_CANCEL。

你应该运行它只做一次并检查它的结果

result = BoxInputNo.ShowModal()

if result == wx.ID_OK:
    pass
elif result == wx.ID_CANCEL:
    self.Close()
    return

2) 您必须将功能分配给按钮，此功能应重置变量并再次显示对话框 window。但我认为 wx.Button 可能比 wx.ToggleButton

更好

    ConfirmationBoxCancel = wx.Button(panel, label="Cancel", pos=(180, 200))
    ConfirmationBoxCancel.Bind(wx.EVT_BUTTON, self.on_button_cancel)

def on_button_cancel(self, event):
    #print('event:', event)
    pass
    # reset variable and show dialog window

坦率地说，我不明白你的一些变数。也许如果您使用 True/False 而不是 0/1 那么它们将更具可读性。但对我来说主要问题是 while 循环。 GUI 框架（wxPython、tkinter、PyQt 等）应该运行只有一个循环 - Mainloop()。任何其他循环都可能阻塞 Mainloop() 并且 GUI 将冻结。

我创建了自己的版本，没有任何 while 循环，但我不知道它是否解决了所有问题

import wx

class PDFFrame(wx.Frame):

    def __init__(self, parent, title):
        super().__init__(parent, -1, title, size=(400,400))

        self.panel = wx.Panel(self)
        self.Show()

        # show dialog at start 
        if self.show_dialog(self.panel):
            # create StaticLabel and buttons
            self.show_confirmation(self.panel)
        else:
            # close main window and program
            self.Close()


    def show_dialog(self, panel):
        """show dialog window"""

        global no_files_to_combine

        box_input_no = wx.NumberEntryDialog(panel, "So You Want To Combine PDF Files?", "How Many?", "Please Enter", 0, 2, 20)

        result = box_input_no.ShowModal()

        if result == wx.ID_OK: #NumberEntryDialog Pressed OK
            no_files_to_combine = box_input_no.GetValue()
            return True
        elif result == wx.ID_CANCEL:
            print('exit')
            return False


    def show_confirmation(self, panel):
        """create StaticLabel and buttons"""

        self.confirmation_label = wx.StaticText(self.panel, -1, label="You Have Selected {} Files To Combine, Is This Right?".format(no_files_to_combine), pos=(20, 100))

        self.confirmation_box_confirm = wx.Button(self.panel, label="Confirm", pos=(20, 200))
        self.confirmation_box_cancel = wx.Button(self.panel, label="Cancel", pos=(180, 200))
        # assign function
        self.confirmation_box_confirm.Bind(wx.EVT_BUTTON, self.on_button_confirm)
        self.confirmation_box_cancel.Bind(wx.EVT_BUTTON, self.on_button_cancel)


    def update_confirmation(self):
        """update existing StaticLabel"""

        self.confirmation_label.SetLabel("You Have Selected {} Files To Combine, Is This Right?".format(no_files_to_combine))


    def on_button_cancel(self, event):
        """run when pressed `Cancel` button"""

        #print('event:', event)

        # without `GetValue()`        
        if self.show_dialog(self.panel):
            # update existing StaticLabel
            self.update_confirmation()
        else:
            # close main window and program
            self.Close()


    def on_button_confirm(self, event):
        """run when pressed `Confirn` button"""

        #print('event:', event)

        # close main window and program
        self.Close()


# --- main --- 

no_files_to_combine = 0

app = wx.App()
frame = PDFFrame(None, title="Robs PDF Combiner Application")
app.MainLoop()

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