循环浏览 wx.StaticBitmap 中的图像

Question

我正在处理图像数据库，并希望显示在 wx.StaticBitmap 对象中处理的每个图像。据我所知，onView 函数中的行 "self.imageCtrl.SetBitmap(wx.Bitmap(self.img))" 应该更改图像。但我所做的任何事情都无法让它显示出来。该代码来自我对答案的探索，是图像显示应用程序的一部分，每次单击按钮都会更改图像。这非常有效，但是一旦代码嵌入到循环中，它就无法刷新，直到循环完成，最后一个文件最终显示。

    import time
    import os
    import wx

    #============ App and panel class ========#
    class PhotoCtrl(wx.App):
        def __init__(self, redirect=False, filename=None):
            wx.App.__init__(self, redirect, filename)
            self.frame = wx.Frame(None, title='Photo Control')

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

            self.PhotoMaxSize = 256

            self.createWidgets()
            self.frame.Show()

    #=========== Set up button, wx.StaticBitmap etc ===============#

        def createWidgets(self):
            #instructions = 'Browse for an image'
            img = wx.Image(256,256)
            self.imageCtrl = wx.StaticBitmap(self.panel, wx.ID_ANY, wx.Bitmap(img))
            browseBtn = wx.Button(self.panel, label='Go')
            browseBtn.Bind(wx.EVT_BUTTON, self.onView)

            self.mainSizer = wx.BoxSizer(wx.VERTICAL)
            self.sizer = wx.BoxSizer(wx.HORIZONTAL)

            self.mainSizer.Add(wx.StaticLine(self.panel, wx.ID_ANY),
                               0, wx.ALL|wx.EXPAND, 5)
            #self.mainSizer.Add(instructLbl, 0, wx.ALL, 5)
            self.mainSizer.Add(self.imageCtrl, 0, wx.ALL, 5)
            #self.sizer.Add(self.photoTxt, 0, wx.ALL, 5)
            self.sizer.Add(browseBtn, 0, wx.ALL, 5)        
            self.mainSizer.Add(self.sizer, 0, wx.ALL, 5)

            self.panel.SetSizer(self.mainSizer)
            self.mainSizer.Fit(self.frame)

            self.panel.Layout()

    #=== Toy code to simulate automatic change of image to be displayed ===#

        def onView(self, event):
            for i in range(1,10):
                im_pth = os.getcwd() + f'/Cats/cats/Cats_{i}.png'
                self.img = wx.Image(im_pth, wx.BITMAP_TYPE_ANY).ConvertToBitmap()
                self.image = self.img.ConvertToImage()
                self.img = wx.Bitmap(self.image.Scale(256, 256))
                self.imageCtrl.SetBitmap(wx.Bitmap(self.img))
                self.panel.Refresh()
                print(f"should be showing cat_{i}") #This prints but the image doesn't show
                time.sleep(1)

    if __name__ == '__main__':
        app = PhotoCtrl()
        app.MainLoop()

Answer 1

这是因为你在一个循环中，它不会将控制权释放回mainloop。
您需要 Yield 在 time.sleep(1)

之前

即

def onView(self, event):
    for i in range(1,10):
        im_pth = os.getcwd() + f'/frame{i}.png'
        self.img = wx.Image(im_pth, wx.BITMAP_TYPE_ANY).ConvertToBitmap()
        self.image = self.img.ConvertToImage()
        self.img = wx.Bitmap(self.image.Scale(256, 256))
        self.imageCtrl.SetBitmap(wx.Bitmap(self.img))
        self.panel.Refresh()
        wx.Yield()
        print(f"should be showing cat_{i}") #This prints but the image doesn't show
        time.sleep(1)

严格来说，在 wxPython Phoenix 下应该是 wx.GetApp().Yield() 但 wx.Yield() 仍然有效。

循环浏览 wx.StaticBitmap 中的图像

Cycling through images in wx.StaticBitmap

wxpython