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from kivy.app import App | |
from kivy.uix.button import Button | |
from kivy.uix.boxlayout import BoxLayout | |
from kivy.uix.gridlayout import GridLayout | |
from kivy.uix.label import Label | |
class myApp(App): | |
def build(self): | |
root_widget = BoxLayout(orientation='vertical') | |
output_label = Label(size_hint_y = 0.75, font_size=50) | |
button_symbols = ('1', '2', '3', '+', | |
'4', '5', '6', '-', | |
'7', '8', '9', '.', | |
'0', '*', '/', '=') | |
button_grid = GridLayout(cols=4, size_hint_y=2) | |
for symbol in button_symbols: | |
button_grid.add_widget(Button(text=symbol)) | |
clear_button = Button(text = 'Clear', size_hint_y=None, height=100) | |
def print_button_text(instance): | |
output_label.text += instance.text | |
for button in button_grid.children[1:]: | |
button.bind(on_press=print_button_text) | |
def resize_label_text(label, new_height): | |
label.fontsize = 0.5*label.height | |
output_label.bind(height=resize_label_text) | |
def evaluate_result(instance): | |
try: | |
output_label.text = str(eval(output_label.text)) | |
except SyntaxError: | |
output_label.text = 'Python Syntax error!' | |
button_grid.children[0].bind(on_press=evaluate_result) | |
def clear_label(instance): | |
output_label.text = " " | |
clear_button.bind(on_press=clear_label) | |
root_widget.add_widget(output_label) | |
root_widget.add_widget(button_grid) | |
root_widget.add_widget(clear_button) | |
return root_widget | |
myApp().run() |
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