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，函数onView中的这一行“ self.imageCtrl.SetBitmap（wx.Bitmap（self.img））”应该会更改图像。但是我什么也做不了。该代码是从我的探索得到的答案，并且是图像显示应用程序的一部分，该应用程序每次单击按钮都会更改图像。效果很好，但是一旦将代码嵌入循环中，它就无法刷新，直到循环完成，最后显示最后一个文件为止。

    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

这是因为您处于循环状态，不会将控制权释放回mainloop。
您需要Yield之前time.sleep(1)

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，应该为wx.GetApp().Yield()但wx.Yield()仍然有效。

在wx.StaticBitmap中循环浏览图像

1 个答案: