wxPython程序扫描

Question

我试图更好地理解 wxPython 如何“扫描”。

请看我下面的代码：

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，因此显然还没有完成。但是，我想通过上述方式完成的是：

1. 显示一个数字输入弹出窗口。如果用户按“取消”退出应用程序（这可行，但由于某种原因需要按 2 次？）。如果按 OK，则：

2. 显示在步骤 1 中输入的数字，带有 2 个附加按钮。 “确认”尚未执行任何操作，但“取消”应将您带回第 1 步。（通过重置 PDFNoConfirmedInitially 标志）。

现在第 2 步不起作用。当我调试它几乎看起来好像PDFFrameonly 被扫描一次。我可能错误的假设是，由于app.MainLoop() 不断扫描 wx.App() 而这又会调用子框架，这将被不断扫描？

帮助/指点/更深层次的理解总是很感激，

谢谢 抢

Answer 1

1) ShowModal() 显示对话窗口，你使用它两次

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

和

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

所以它会显示你的窗口两次。

只有在第二次检查wx.ID_CANCEL。

你应该只运行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) 您必须为按钮分配功能，此功能应重置变量并再次显示对话框窗口。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，我不了解您的一些变量。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）应该只运行一个循环 - Mainloop()。任何其他循环都可能阻塞Mainloop()，GUI 将冻结。

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

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()