kivy/examples/demo/showcase/main.py

#!/usr/bin/kivy
from time import time
from kivy.app import App
from os.path import dirname, join
from kivy.lang import Builder
from kivy.properties import NumericProperty, StringProperty, BooleanProperty,\
                            ListProperty
from kivy.clock import Clock
from kivy.animation import Animation
from kivy.uix.screenmanager import Screen


class ShowcaseScreen(Screen):
    fullscreen = BooleanProperty(False)
    def add_widget(self, *args):
        if 'content' in self.ids:
            return self.ids.content.add_widget(*args)
        return super(ShowcaseScreen, self).add_widget(*args)


class ShowcaseApp(App):

    index = NumericProperty(-1)
    current_title = StringProperty()
    time = NumericProperty(0)
    show_sourcecode = BooleanProperty(False)
    sourcecode = StringProperty()
    screen_names = ListProperty([])
    higherarchy = ListProperty([])

    def build(self):
        Clock.schedule_interval(self._update_clock, 1 / 60.)
        self.screens = {}
        self.available_screens = [
            'buttons', 'togglebutton', 'sliders', 'progressbar', 'switches',
            'checkboxes', 'textinputs', 'accordions', 'filechoosers',
            'carousel', 'bubbles', 'codeinput', 'dropdown', 'spinner',
            'scatter', 'splitter', 'tabbedpanel', 'rstdocument',
            'screenmanager']
        self.screen_names = self.available_screens
        curdir = dirname(__file__)
        self.available_screens = [join(curdir, 'data', 'screens',
            '{}.kv'.format(fn)) for fn in self.available_screens]
        self.go_next_screen()

    def on_pause(self):
        return True

    def on_resume(self):
        pass

    def on_current_title(self, instance, value):
        self.root.ids.spnr.text = value

    def go_previous_screen(self):
        self.index = (self.index - 1) % len(self.available_screens)
        screen = self.load_screen(self.index)
        sm = self.root.ids.sm
        sm.switch_to(screen, direction='right')
        self.current_title = screen.name
        self.update_sourcecode()

    def go_next_screen(self):
        self.index = (self.index + 1) % len(self.available_screens)
        screen = self.load_screen(self.index)
        sm = self.root.ids.sm
        sm.switch_to(screen, direction='left')
        self.current_title = screen.name
        self.update_sourcecode()

    def go_screen(self, idx):
        self.index = idx
        self.root.ids.sm.switch_to(self.load_screen(idx), direction='left')
        self.update_sourcecode()

    def load_screen(self, index):
        if index in self.screens:
            return self.screens[index]
        screen = Builder.load_file(self.available_screens[index])
        self.screens[index] = screen
        return screen

    def read_sourcecode(self):
        fn = self.available_screens[self.index]
        with open(fn) as fd:
            return fd.read()

    def toggle_source_code(self):
        self.show_sourcecode = not self.show_sourcecode
        if self.show_sourcecode:
            height = self.root.height * .3
        else:
            height = 0

        Animation(height=height, d=.3, t='out_quart').start(
                self.root.ids.sv)

        self.update_sourcecode()

    def update_sourcecode(self):
        if not self.show_sourcecode:
            self.root.ids.sourcecode.focus = False
            return
        self.root.ids.sourcecode.text = self.read_sourcecode()
        self.root.ids.sv.scroll_y = 1

    def showcase_floatlayout(self, layout):

        def add_button(*t):
            if not layout.get_parent_window():
                return
            if len(layout.children) > 5:
                layout.clear_widgets()
            layout.add_widget(Builder.load_string('''
#:import random random.random
Button:
    size_hint: random(), random()
    pos_hint: {'x': random(), 'y': random()}
    text:
        'size_hint x: {} y: {}\\n pos_hint x: {} y: {}'.format(\
            self.size_hint_x, self.size_hint_y, self.pos_hint['x'],\
            self.pos_hint['y'])
'''))
            Clock.schedule_once(add_button, 1)
        Clock.schedule_once(add_button)

    def showcase_boxlayout(self, layout):

        def add_button(*t):
            if not layout.get_parent_window():
                return
            if len(layout.children) > 5:
                layout.orientation = 'vertical'\
                    if layout.orientation == 'horizontal' else 'horizontal'
                layout.clear_widgets()
            layout.add_widget(Builder.load_string('''
Button:
    text: self.parent.orientation if self.parent else ''
'''))
            Clock.schedule_once(add_button, 1)
        Clock.schedule_once(add_button)

    def showcase_gridlayout(self, layout):

        def add_button(*t):
            if not layout.get_parent_window():
                return
            if len(layout.children) > 15:
                layout.rows = 3 if layout.rows == None else None
                layout.cols = None if layout.rows == 3 else 3
                layout.clear_widgets()
            layout.add_widget(Builder.load_string('''
Button:
    text:
        'rows: {}\\ncols: {}'.format(self.parent.rows, self.parent.cols)\
        if self.parent else ''
'''))
            Clock.schedule_once(add_button, 1)
        Clock.schedule_once(add_button)

    def showcase_stacklayout(self, layout):
        orientations = ('lr-tb', 'tb-lr',
                        'rl-tb', 'tb-rl',
                        'lr-bt', 'bt-lr',
                        'rl-bt', 'bt-rl')

        def add_button(*t):
            if not layout.get_parent_window():
                return
            if len(layout.children) > 11:
                layout.clear_widgets()
                cur_orientation = orientations.index(layout.orientation)
                layout.orientation = orientations[cur_orientation - 1]
            layout.add_widget(Builder.load_string('''
Button:
    text: self.parent.orientation if self.parent else ''
    size_hint: .2, .2
'''))
            Clock.schedule_once(add_button, 1)
        Clock.schedule_once(add_button)

    def showcase_anchorlayout(self, layout):

        def change_anchor(self, *l):
            if not layout.get_parent_window():
                return
            anchor_x = ('left', 'center', 'right')
            anchor_y = ('top', 'center', 'bottom')
            if layout.anchor_x == 'left':
                layout.anchor_y = anchor_y[anchor_y.index(layout.anchor_y) - 1]
            layout.anchor_x = anchor_x[anchor_x.index(layout.anchor_x) -1]

            Clock.schedule_once(change_anchor, 1)
        Clock.schedule_once(change_anchor, 1)


    def _update_clock(self, dt):
        self.time = time()

if __name__ == '__main__':
    ShowcaseApp().run()