更新/刷新动态创建的 WxPython 小部件

Posted 2023-02-22

【中文标题】更新/刷新动态创建的 WxPython 小部件

【英文标题】：Update/Refresh Dynamically–Created WxPython Widgets

【发布时间】：2012-05-09 06:47:23

【问题描述】：

这里是新的 Python 程序员，正在尝试学习如何动态更新小部件。首先，我有以下代码。我想做的是将我的变量“self.dynamiclength”更改为任何整数，并让 WxPython 适当地更新小部件的数量。在更新 self.dynamiclength 无济于事后，我尝试将 self.Refresh() 和 self.Update() 放入我的 TestFrame。

在寻求帮助之前，我已经尽可能多地阅读了这方面的内容，但我在 Wx 上太新了，无法自己解决这个问题。非常感谢！

import wx
import  wx.lib.scrolledpanel as scrolled

class TestFrame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, size=(1000, 550))
        panel = wx.Panel(self)

        mainSizer = wx.BoxSizer(wx.VERTICAL)
        pbox0 = wx.BoxSizer(wx.VERTICAL)
        controlback0 = wx.Button(panel, label="Back0")
        controlforward0 = wx.Button(panel, label="Forward0")
        pbox0.Add(controlback0, 0, wx.ALL)
        pbox0.Add(controlforward0, 0, wx.ALL)
        mainSizer.Add(pbox0)

        self.scrolling_window = scrolled.ScrolledPanel( panel )
        self.scrolling_window.SetAutoLayout(1)
        self.scrolling_window.SetupScrolling()
        self.sizer = wx.BoxSizer( wx.VERTICAL )
        self.child_windows = []

        ##############################################
        #this is the variable that I want to change, 
        #and I don't know how to get the 'for loop' 
        #below to update as well. 

        self.eedictionary = 
        self.dynamiclength = 5
        for i in range(0,self.dynamiclength):
            wind = self.addBox(i)
            self.sizer.Add(wind, 0, wx.CENTER|wx.ALL, 5)
        ###############################################
        #the following code binds all appropriate buttons to a pedigree variable updater
        button_binding_list = ['controlback','controlforward']
        for j in button_binding_list:
            eid = self.eedictionary[str(i)+j]
            self.scrolling_window.Bind(wx.EVT_BUTTON, lambda evt: self.onclick(evt, id), id=eid)

        self.scrolling_window.SetSizer(self.sizer)

        mainSizer.Add(self.scrolling_window, 1, wx.EXPAND)
        panel.SetSizer(mainSizer)

    def addBox(self, i):
        pbox = wx.BoxSizer(wx.VERTICAL)

        controlback = wx.Button(self.scrolling_window, label="Back")
        controlforward = wx.Button(self.scrolling_window, label="Forward")

        pbox.AddMany([(controlback, 0, wx.ALL), (controlforward, 0, wx.ALL)])

        #for each object created in the addBox module, its id is added to the dictionary 
        self.eedictionary[str(i)+'controlback'] = controlback.GetId()
        self.eedictionary[str(i)+'controlforward'] = controlforward.GetId()
        return pbox

    def onclick(self, event):
        self.dynamiclength +=1
        print 'added one to self.dynamiclength', self.dynamiclength

if __name__=='__main__':
    app = wx.App(False)
    f = TestFrame()
    f.Show()
    app.MainLoop()

【问题讨论】：

请注意，我可以弄清楚如何使用 self.scrolling_window.Destroy()，但问题是我无法重新创建 scrolling_window，因为我得到了 sizer 或某种绑定错误。

【参考方案1】：

我有类似的测试代码，我之前写过。也许你会发现它很有用。

import wx

#===================================================================================================
class UpperPanel(wx.Panel):
    def __init__(self, *args, **kwargs):
        wx.Panel.__init__(self, *args, **kwargs)
        self.combo = wx.ComboBox(self, choices=["0", "1", "2", "3", "4"], size=(200, -1))
        self.combo.Bind(wx.EVT_COMBOBOX, self.GetParent().middlePanel.Change)
        self.logo = wx.Button(self, size=(300, 100))

        self.sizer = wx.BoxSizer()
        self.sizer.Add(self.combo, 0, wx.EXPAND)
        self.sizer.Add(self.logo, 0, wx.EXPAND)

        self.SetSizerAndFit(self.sizer)

#===================================================================================================
class MiddlePanel(wx.Panel):
    def __init__(self, *args, **kwargs):
        wx.Panel.__init__(self, *args, **kwargs)
        self.subs = []
        self.sizer = wx.BoxSizer(wx.VERTICAL)
        self.SetSizerAndFit(self.sizer)


    def Change(self, e):
        self.sizer = wx.BoxSizer(wx.VERTICAL)

        for a in self.subs:
            a.Destroy()

        self.subs = []

        for a in range(int(e.GetString())):
            b = wx.Button(self, size=(-1, 50))
            self.subs.append(b)
            self.sizer.Add(b, 1, wx.EXPAND)

        self.SetSizerAndFit(self.sizer)
        self.GetParent().Fit()

#===================================================================================================
class MainWin(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None)

        self.middlePanel = MiddlePanel(self)
        self.upperPanel = UpperPanel(self)
        self.textArea = wx.TextCtrl(self, size=(-1, 300), style=wx.TE_MULTILINE)

        self.sizer = wx.BoxSizer(wx.VERTICAL)
        self.sizer.Add(self.upperPanel, 0, wx.EXPAND)
        self.sizer.Add(self.middlePanel, 0, wx.EXPAND)
        self.sizer.Add(self.textArea, 1, wx.EXPAND)

        self.SetSizerAndFit(self.sizer)

#===================================================================================================
if __name__ == '__main__':
    app = wx.PySimpleApp()
    main_win = MainWin()
    main_win.Show()
    app.MainLoop()

【讨论】：

self.GetParent().Fit() 刷新屏幕！或者使用self.GetParent().Layout()，重点是使用self.GetParent()获取父对象，然后对其调用refresh。

【参考方案2】：

如果您需要在创建并显示应用程序之后更新小部件的数量，您需要在方法中完成，而不是在 init 中。 init 仅在应用程序第一次实例化时运行。每当您在显示框架后添加或删除小部件时，您都需要在父小部件或其大小调整器上调用 Layout()。另见

http://wxpython-users.1045709.n5.nabble.com/dynamically-adding-amp-removing-widgets-td2342432.html https://groups.google.com/forum/?fromgroups#!topic/wxPython-users/eQjlYlsw4qs Adding a widget with a button - wxPython