图像在面板运行时未显示，wxpython

Question

我正在尝试使用 for 循环显示图像文件夹中的所有图像，并且所有图像都正确显示。但是我想在运行时添加另一个图像，所以我在这里使用线程threading.Timer(2.0, self.basicgui).start() 每当我将新图像添加到文件夹时，我可以在图像列表中看到图像的名称，但无法更新。我想刷新面板以显示更新的图像我该如何解决这个问题。

    import wx
    import threading
    from PIL import Image
    import wx.lib.scrolledpanel
    import os


    class windowclass(wx.Frame):

        def __init__(self, *args, **kwargs):
            super(windowclass, self).__init__(*args, **kwargs)
            global panel1
            panel1 = wx.Panel(self,size=(1000,28), pos=(0,0), style=wx.SIMPLE_BORDER)
            panel1.SetBackgroundColour('#FDDF99')
            global panel2
            panel2 = wx.lib.scrolledpanel.ScrolledPanel(panel1,-1, size=(350,710), pos=(1010,0), style=wx.SIMPLE_BORDER)
            panel2.SetupScrolling()
            panel2.SetBackgroundColour('#FFFFFF')
            self.basicgui()


        def basicgui(self):
            padding = 0
            bSizer = wx.BoxSizer( wx.VERTICAL )
            self.jpgs = GetJpgList("./image")
            allimage = len(self.jpgs)
            print(allimage)


            for i in range(0,allimage):
                #print("i=",i)
                bitmap = wx.Bitmap(self.jpgs[i])
                image = wx.ImageFromBitmap(bitmap)
                image = image.Scale(300, 200, wx.IMAGE_QUALITY_HIGH)
                bitmap = wx.BitmapFromImage(image)
                control = wx.StaticBitmap(panel2, -1, bitmap)
                #print(control)
                control.SetPosition((10, padding+10))
                padding += 210
                bSizer.Add( control, 0, wx.ALL, 5 )
            panel2.SetSizer( bSizer )
            panel2.Layout()
            threading.Timer(2.0, self.basicgui).start()        
            self.Show()
            return


    def GetJpgList(dir):
        jpgs = [f for f in os.listdir(dir) if f[-4:] == ".jpg"]
        # print "JPGS are:", jpgs
        return [os.path.join(dir, f) for f in jpgs]


    def main():
        app = wx.App()
        windowclass(None)
        app.MainLoop()


    main()

Answer 1

这是您的代码，经过修改以提高效率。
目前，您每次都生成图像，少量可能没问题，但如果图像很多，这会占用您的 CPU。
在这里，我已经建立了一个图像字典，所以只需要转换添加和删除。发现是否需要做任何工作也很有用，所以我假设一个简单的计数可以告诉我没有任何变化，因此不需要做任何工作。

import wx
import wx.lib.scrolledpanel
import glob

class windowclass(wx.Frame):
    def __init__(self, *args, **kwargs):
        super(windowclass, self).__init__(*args, **kwargs)
        self.panel1 = wx.Panel(self,size=(1000,28), style=wx.SIMPLE_BORDER)
        self.panel1.SetBackgroundColour('#FDDF99')
        self.panel2 = wx.lib.scrolledpanel.ScrolledPanel(self.panel1,-1, size=(350,550))
        self.panel2.SetupScrolling()
        self.panel2.SetBackgroundColour('#FFFFFF')
        self.panel2.SetMinSize((350,550))
        self.timer = wx.Timer(self)
        self.Bind(wx.EVT_TIMER, self.basicgui, self.timer)
        self.dict = {}

        self.bSizer = wx.BoxSizer( wx.VERTICAL )
        self.panel2.SetSizer(self.bSizer)
        self.mainsizer = wx.BoxSizer( wx.HORIZONTAL )
        self.mainsizer.Add(self.panel1,1,wx.EXPAND)
        self.SetSizer(self.mainsizer)
        self.timer.Start(2000)

    def basicgui(self,event):
        self.GetJpgList("./images")
        allimage = len(self.dict)
        items = self.bSizer.GetChildren()
        #if the image count is the same as before nothing has changed - bail
        if len(items) == allimage:
            return
        #remove existing images from the sizer
        for i in items:
            i.GetWindow().Destroy()
        # add images to the sizer
        for item, bitmap in self.dict.items():
            control = wx.StaticBitmap(self.panel2, -1, bitmap)
            self.bSizer.Add( control, 0, wx.CENTER|wx.ALL, 5 )
        #reset scrolling
        self.panel2.SetupScrolling(scrollToTop=False)
        self.Layout()
        self.Show()

    def GetJpgList(self, dir):
        #use glob rather than os.listdir
        jpgs = glob.glob(dir+"/*.jpg")

        #Build a dictionary of the images
        #this way we only have to create them once
        for i in jpgs:
            #if image already in dict bail
            if i in self.dict:
                continue
            print("adding", i)
            bitmap = wx.Bitmap(i)
            image = bitmap.ConvertToImage()
            image = image.Scale(300, 200, wx.IMAGE_QUALITY_HIGH)
            bitmap = wx.Bitmap(image)
            self.dict[i] = bitmap

        #make a list of any deleted images
        del_list = []
        for i in self.dict:
            if i not in jpgs:
                del_list.append(i)
        #remove deleted images from the dictionary
        for i in del_list:
            self.dict.pop(i)
            print("deleting",i)

        return

def main():
    app = wx.App()
    windowclass(None)
    app.MainLoop()

main()