CODEWITHSUNDEEP
pythonkivykivy-language
krsta4r
krsta4r

Reputation: 11

Kivy reload() image not updating in app window

I am currently making a Python app using Kivy and KivyMD for UI. The general idea of my app is for the user to press a button and a QR code image will appear in the app window. If the user presses the button again, a new QR code image should appear. I am trying to use the Kivy reload() function to update the QR code image but it only updates the image in the directory and not in the app window.

Kivy Builder load string:

 Window.size = (320, 500)

 main_kv = """

 BoxLayout:
     orientation: 'vertical'
      size_hint_y: None
      height: self.minimum_height
      spacing: dp(10)
 MDLabel:
      font_name: 'Roboto-Italic'
      theme_text_color: 'Primary'
      text: "Public Key:"
      halign: 'center'
      pos_hint: {'center_x': .5, 'center_y': .90}
      font_size: 20
 Image:
      id:qr
      source: 'qr.jpg'
      size: self.texture_size
 MDLabel:
      font_name: 'Roboto-Italic'
      theme_text_color: 'Primary'
      text: "Private Key:"
      halign: 'center'
      pos_hint: {'center_x': .5, 'center_y': .50}
      font_size: 20

 MDRectangleFlatIconButton:
      text: "Generate Keys"
      icon: 'polymer'
      opposite_colors: True
      pos_hint: {'center_x': .5 , 'center_y': .08}
      elevation: 10
      on_press: app.b32Keys()
      opposite_colors: True


"""

Python Code:

class KnixBTC(App):
    theme_cls = ThemeManager()
    theme_cls.primary_palette = 'DeepPurple'
    theme_cls.accent_palette = 'Orange'
    theme_cls.theme_style = 'Dark'

    def build(self):
        self.main_widget = Builder.load_string(main_kv)
        return self.main_widget

    def b32Keys(self):
        image = Image(source='qr.jpg', nocache=True)
        privateKey = PrivateKey.random()
        private = privateKey.wif(compressed=True)
        publicKey = privateKey.to_public()
        bech32 = publicKey.to_address('P2WPKH')
        genQR = qrcode.make(bech32)
        genQR.save("qr.jpg")
        image.reload()


if __name__ == "__main__":
    KnixBTC().run()

Upvotes: 0

Views: 873

Answers (1)

eyllanesc
eyllanesc

Reputation: 244252

image is different from qr, the first one is created each time the b32Keys function is invoked and the second is the one shown, so reloading image does not reload qr. So the solution is to access qr directly, in this case you must use the root and id:

def b32Keys(self):
    privateKey = PrivateKey.random()
    private = privateKey.wif(compressed=True)
    publicKey = privateKey.to_public()
    bech32 = publicKey.to_address('P2WPKH')
    genQR = qrcode.make(bech32)
    genQR.save("qr.jpg")
    self.main_widget.ids.qr.reload()

Upvotes: 0

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