Guizero文本框焦点

Question

我是一个新手，我有一个小脚本，它使用guizero创建一个小应用程序来读取rfid标签并激活门锁。我的问题是，当电源关闭，覆盆子皮重新启动。脚本启动，但我必须在文本框中手动单击它才能开始工作。如何让它在启动时自动将焦点设置在文本框上？谢谢马克

下面是代码，我在网上找到了这个项目，并修改了一些来为我工作。

    from gpiozero import LED, Buzzer
    from guizero import App, Box, Text, TextBox, warn
    import gpiozero
    import csv
    RELAY_PIN = 17
    led8 = LED(5)
    led9 = LED(6)
    relay= gpiozero.OutputDevice(RELAY_PIN,active_high=False, initial_value=False)
    
    def clearDisplay():
        print("Clear display")
        rfidStatus.value = "—"
        rfidText.value = ""
        led8.off()
        led9.off()
        relay.off()
        rfidStatus.repeat(1000, checkRFidTag)
        
    
    def checkRFidTag():
        tagId = rfidText.value
        if tagId != "":
            RFidRegistered = False
            print(tagId)
            with open("Database.csv") as csvfile:
                reader = csv.DictReader(csvfile)
                for row in reader:
                    if row["RFid"] == tagId:
                        RFidRegistered = True
                        print("Welcome " + row["User"])
                        rfidStatus.value = "Welcome " + row["User"]
                        led8.on()
                        relay.toggle()                 
                        rfidStatus.after(5000, clearDisplay)
                       
            
            if RFidRegistered == False:
                print("RFid tag is not registered")
                rfidStatus.value = "RFid tag is not registered"
                led9.on()
                rfidStatus.after(3000, clearDisplay)
            
            rfidStatus.cancel(checkRFidTag)
    
    app = App(title="RFID EM4100 Simple GUI", width=350, height=150, layout="auto")
    
    instructionText = Text(app, text="Click on the text button below\nand scan your RFid tag.")
    rfidText = TextBox(app,text="")
    rfidStatus = Text(app, text="—")
    rfidStatus.repeat(1000, checkRFidTag)
    #designBy = Text(app, text="Design by Idris – Cytron Technologies", align="bottom")
    
    app.display()
    view

Answer 1

启动后不久，您可以使用与应用程序关联的计时器来调用功能。例如，使用：

        app.after(1000,setFocus)

打电话：

        def setFocus():
            nameOfTextBox.focus()

下面的示例设置两个文本框和两个按钮。通过注释掉setFocus中的一行，它在一秒后将焦点设置为右侧文本框或“取消”按钮：

        from guizero import App, Text, Box, TextBox, PushButton
        import sys

        app = App(title="Give Focus")
        app.width = 500
        app.height = 100
        paddingHeight = 1
        paddingWidth = 10
        buttonWidth = 10
        topBoxHeight = 100
        bottomBoxHeight = 100
        app.height = topBoxHeight + bottomBoxHeight

        def setFocus():
            rightTextBox.focus()
        #    buttonCancel.focus()


        def call_exit():
            buttonCancel.text="Exiting"
            buttonCancel.enabled=False
            app.update()
            app.destroy()
            sys.exit()
            
            
        topBox = Box(app, align="top", width= "fill", height = topBoxHeight, border= True)
        textFieldBox = Box(topBox, align="top", width= "fill", height= "fill", border= True, layout = "grid")
        paddingT00 = Text(textFieldBox, text="", width = paddingWidth, height = paddingHeight, grid = [0,0])
        paddingT10 = Text(textFieldBox, text="", width = paddingWidth, height = paddingHeight, grid = [1,0])
        message = Text(textFieldBox, text="Text Field Box", grid = [2,0])
        paddingT01 = Text(textFieldBox, text="", width = paddingWidth, height = paddingHeight, grid = [0,1])
        leftTextBox = TextBox(textFieldBox, text="Type here", width = paddingWidth, height = 1, grid = [1,1])
        paddingT21 = Text(textFieldBox, text="", width = paddingWidth, height = paddingHeight, grid = [2,1])
        rightTextBox = TextBox(textFieldBox, text="...or here", width = paddingWidth, height = 1, grid = [3,1])


        bottomBox = Box(app, align="top", width= "fill", height = bottomBoxHeight, border= True)
        buttonBox = Box(bottomBox, align="top", width= "fill", height= "fill", border= True, layout = "grid")
        paddingB00 = Text(buttonBox, text="", width = paddingWidth, height = paddingHeight, grid = [0,0])
        paddingB10 = Text(buttonBox, text="", width = paddingWidth, height = paddingHeight, grid = [1,0])
        message = Text(buttonBox, text="Button Box", grid = [2,0])
        paddingB01 = Text(buttonBox, text="", width = paddingWidth, height = paddingHeight, grid = [0,1])
        buttonOK = PushButton(buttonBox, text="OK", width = paddingWidth, height = 1, grid = [1,1])
        paddingB21 = Text(buttonBox, text="", width = paddingWidth, height = paddingHeight, grid = [2,1])
        buttonCancel = PushButton(buttonBox, text="Cancel", command = call_exit, width = paddingWidth, height = 1, grid = [3,1])

        app.after(1000,setFocus)

        app.display()