99 lines
3.6 KiB
Python
99 lines
3.6 KiB
Python
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from kivy.app import App
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from kivy.uix.gridlayout import GridLayout
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from kivy.uix.boxlayout import BoxLayout
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from kivy.uix.label import Label
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from kivy.uix.behaviors import FocusBehavior
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from kivy.graphics import Color, Rectangle
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class FocusWithColor(FocusBehavior):
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''' Class that when focused, changes its background color to red.
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'''
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_color = None
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_rect = None
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def __init__(self, **kwargs):
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super(FocusWithColor, self).__init__(**kwargs)
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with self.canvas:
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self._color = Color(1, 1, 1, .2)
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self._rect = Rectangle(size=self.size, pos=self.pos)
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self.bind(size=self._update_rect, pos=self._update_rect)
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def _update_rect(self, instance, value):
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self._rect.pos = instance.pos
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self._rect.size = instance.size
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def on_focused(self, instance, value, *largs):
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self._color.rgba = [1, 0, 0, .2] if value else [1, 1, 1, .2]
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class FocusLabel(FocusWithColor, Label):
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'''A label, which in addition to turn red when focused, it also sets the
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keyboard input to the text of the label.
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'''
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def keyboard_on_key_down(self, window, keycode, text, modifiers):
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'''We call super before doing anything else to enable tab cycling
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by FocusBehavior. If we wanted to use tab for ourselves, we could just
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not call it, or call it if we didn't need tab.
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'''
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if super(FocusLabel, self).keyboard_on_key_down(window, keycode,
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text, modifiers):
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return True
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self.text = keycode[1]
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return True
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class FocusGridLayout(FocusWithColor, GridLayout):
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pass
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class FocusBoxLayout(FocusWithColor, BoxLayout):
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pass
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class FocusApp(App):
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def build(self):
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root = FocusBoxLayout(padding=[10, 10], spacing=10)
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self.grid1 = grid1 = FocusGridLayout(cols=4, padding=[10, 10],
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spacing=10)
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self.grid2 = grid2 = FocusGridLayout(cols=4, padding=[10, 10],
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spacing=10)
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root.add_widget(FocusLabel(text='Left', size_hint_x=0.4))
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root.add_widget(grid1)
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root.add_widget(grid2)
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root.add_widget(FocusLabel(text='Right', size_hint_x=0.4))
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for i in range(40):
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grid1.add_widget(FocusLabel(text='l' + str(i)))
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for i in range(40):
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grid2.add_widget(FocusLabel(text='r' + str(i)))
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# make elements 29, 9 un-focusable. The widgets are displayed in
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# reverse order, so 9 = 39 - 10
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grid2.children[30].text = grid1.children[14].text =\
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grid2.children[15].text = grid1.children[34].text = 'Skip me'
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grid2.children[15].is_focusable = False
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grid2.children[30].is_focusable = False
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# similarly, make 39 - 14 = 25, and 5 un-focusable
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grid1.children[14].is_focusable = False
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grid1.children[34].is_focusable = False
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# don't move focus passed this element
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grid2.children[35].focus_next = StopIteration
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grid2.children[35].text = 'Stop forward'
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# exchange the links between the sides so that it'll skip to the other
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# side in the middle. Remember that children are displayed reversed
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# in layouts.
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grid1.children[10].focus_next = grid2.children[9]
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grid2.children[10].focus_next = grid1.children[9]
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grid1.children[10].text = '-->'
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grid2.children[10].text = '<--'
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return root
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if __name__ == '__main__':
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FocusApp().run()
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