392 lines
13 KiB
Python
392 lines
13 KiB
Python
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'''
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Drop-Down List
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==============
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.. image:: images/dropdown.gif
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:align: right
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.. versionadded:: 1.4.0
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A versatile drop-down list that can be used with custom widgets. It allows you
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to display a list of widgets under a displayed widget. Unlike other toolkits,
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the list of widgets can contain any type of widget: simple buttons,
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images etc.
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The positioning of the drop-down list is fully automatic: we will always try to
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place the dropdown list in a way that the user can select an item in the list.
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Basic example
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-------------
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A button with a dropdown list of 10 possible values. All the buttons within the
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dropdown list will trigger the dropdown :meth:`DropDown.select` method. After
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being called, the main button text will display the selection of the
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dropdown. ::
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from kivy.uix.dropdown import DropDown
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from kivy.uix.button import Button
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from kivy.base import runTouchApp
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# create a dropdown with 10 buttons
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dropdown = DropDown()
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for index in range(10):
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# When adding widgets, we need to specify the height manually
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# (disabling the size_hint_y) so the dropdown can calculate
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# the area it needs.
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btn = Button(text='Value %d' % index, size_hint_y=None, height=44)
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# for each button, attach a callback that will call the select() method
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# on the dropdown. We'll pass the text of the button as the data of the
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# selection.
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btn.bind(on_release=lambda btn: dropdown.select(btn.text))
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# then add the button inside the dropdown
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dropdown.add_widget(btn)
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# create a big main button
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mainbutton = Button(text='Hello', size_hint=(None, None))
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# show the dropdown menu when the main button is released
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# note: all the bind() calls pass the instance of the caller (here, the
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# mainbutton instance) as the first argument of the callback (here,
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# dropdown.open.).
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mainbutton.bind(on_release=dropdown.open)
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# one last thing, listen for the selection in the dropdown list and
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# assign the data to the button text.
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dropdown.bind(on_select=lambda instance, x: setattr(mainbutton, 'text', x))
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runTouchApp(mainbutton)
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Extending dropdown in Kv
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------------------------
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You could create a dropdown directly from your kv::
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#:kivy 1.4.0
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<CustomDropDown>:
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Button:
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text: 'My first Item'
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size_hint_y: None
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height: 44
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on_release: root.select('item1')
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Label:
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text: 'Unselectable item'
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size_hint_y: None
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height: 44
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Button:
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text: 'My second Item'
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size_hint_y: None
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height: 44
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on_release: root.select('item2')
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And then, create the associated python class and use it::
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class CustomDropDown(DropDown):
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pass
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dropdown = CustomDropDown()
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mainbutton = Button(text='Hello', size_hint=(None, None))
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mainbutton.bind(on_release=dropdown.open)
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dropdown.bind(on_select=lambda instance, x: setattr(mainbutton, 'text', x))
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'''
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__all__ = ('DropDown', )
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from kivy.uix.scrollview import ScrollView
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from kivy.properties import ObjectProperty, NumericProperty, BooleanProperty
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from kivy.core.window import Window
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from kivy.lang import Builder
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from kivy.clock import Clock
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from kivy.config import Config
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_grid_kv = '''
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GridLayout:
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size_hint_y: None
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height: self.minimum_size[1]
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cols: 1
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'''
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class DropDownException(Exception):
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'''DropDownException class.
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'''
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pass
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class DropDown(ScrollView):
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'''DropDown class. See module documentation for more information.
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:Events:
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`on_select`: data
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Fired when a selection is done. The data of the selection is passed
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in as the first argument and is what you pass in the :meth:`select`
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method as the first argument.
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`on_dismiss`:
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.. versionadded:: 1.8.0
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Fired when the DropDown is dismissed, either on selection or on
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touching outside the widget.
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'''
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auto_width = BooleanProperty(True)
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'''By default, the width of the dropdown will be the same as the width of
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the attached widget. Set to False if you want to provide your own width.
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:attr:`auto_width` is a :class:`~kivy.properties.BooleanProperty`
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and defaults to True.
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'''
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max_height = NumericProperty(None, allownone=True)
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'''Indicate the maximum height that the dropdown can take. If None, it will
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take the maximum height available until the top or bottom of the screen
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is reached.
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:attr:`max_height` is a :class:`~kivy.properties.NumericProperty` and
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defaults to None.
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'''
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dismiss_on_select = BooleanProperty(True)
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'''By default, the dropdown will be automatically dismissed when a
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selection has been done. Set to False to prevent the dismiss.
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:attr:`dismiss_on_select` is a :class:`~kivy.properties.BooleanProperty`
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and defaults to True.
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'''
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auto_dismiss = BooleanProperty(True)
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'''By default, the dropdown will be automatically dismissed when a
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touch happens outside of it, this option allows to disable this
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feature
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:attr:`auto_dismiss` is a :class:`~kivy.properties.BooleanProperty`
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and defaults to True.
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.. versionadded:: 1.8.0
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'''
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min_state_time = NumericProperty(0)
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'''Minimum time before the :class:`~kivy.uix.DropDown` is dismissed.
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This is used to allow for the widget inside the dropdown to display
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a down state or for the :class:`~kivy.uix.DropDown` itself to
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display a animation for closing.
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:attr:`min_state_time` is a :class:`~kivy.properties.NumericProperty`
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and defaults to the `Config` value `min_state_time`.
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.. versionadded:: 1.10.0
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'''
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attach_to = ObjectProperty(allownone=True)
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'''(internal) Property that will be set to the widget to which the
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drop down list is attached.
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The :meth:`open` method will automatically set this property whilst
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:meth:`dismiss` will set it back to None.
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'''
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container = ObjectProperty()
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'''(internal) Property that will be set to the container of the dropdown
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list. It is a :class:`~kivy.uix.gridlayout.GridLayout` by default.
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'''
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_touch_started_inside = None
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__events__ = ('on_select', 'on_dismiss')
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def __init__(self, **kwargs):
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self._win = None
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if 'min_state_time' not in kwargs:
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self.min_state_time = float(
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Config.get('graphics', 'min_state_time'))
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if 'container' not in kwargs:
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c = self.container = Builder.load_string(_grid_kv)
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else:
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c = None
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if 'do_scroll_x' not in kwargs:
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self.do_scroll_x = False
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if 'size_hint' not in kwargs:
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if 'size_hint_x' not in kwargs:
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self.size_hint_x = None
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if 'size_hint_y' not in kwargs:
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self.size_hint_y = None
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super(DropDown, self).__init__(**kwargs)
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if c is not None:
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super(DropDown, self).add_widget(c)
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self.on_container(self, c)
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Window.bind(
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on_key_down=self.on_key_down,
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size=self._reposition)
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self.fbind('size', self._reposition)
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def on_key_down(self, instance, key, scancode, codepoint, modifiers):
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if key == 27 and self.get_parent_window():
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self.dismiss()
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return True
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def on_container(self, instance, value):
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if value is not None:
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self.container.bind(minimum_size=self._reposition)
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def open(self, widget):
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'''Open the dropdown list and attach it to a specific widget.
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Depending on the position of the widget within the window and
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the height of the dropdown, the dropdown might be above or below
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that widget.
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'''
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# ensure we are not already attached
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if self.attach_to is not None:
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self.dismiss()
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# we will attach ourself to the main window, so ensure the
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# widget we are looking for have a window
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self._win = widget.get_parent_window()
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if self._win is None:
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raise DropDownException(
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'Cannot open a dropdown list on a hidden widget')
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self.attach_to = widget
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widget.bind(pos=self._reposition, size=self._reposition)
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self._reposition()
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# attach ourself to the main window
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self._win.add_widget(self)
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def dismiss(self, *largs):
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'''Remove the dropdown widget from the window and detach it from
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the attached widget.
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'''
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Clock.schedule_once(self._real_dismiss, self.min_state_time)
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def _real_dismiss(self, *largs):
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if self.parent:
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self.parent.remove_widget(self)
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if self.attach_to:
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self.attach_to.unbind(pos=self._reposition, size=self._reposition)
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self.attach_to = None
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self.dispatch('on_dismiss')
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def on_dismiss(self):
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pass
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def select(self, data):
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'''Call this method to trigger the `on_select` event with the `data`
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selection. The `data` can be anything you want.
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'''
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self.dispatch('on_select', data)
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if self.dismiss_on_select:
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self.dismiss()
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def on_select(self, data):
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pass
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def add_widget(self, *args, **kwargs):
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if self.container:
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return self.container.add_widget(*args, **kwargs)
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return super(DropDown, self).add_widget(*args, **kwargs)
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def remove_widget(self, *args, **kwargs):
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if self.container:
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return self.container.remove_widget(*args, **kwargs)
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return super(DropDown, self).remove_widget(*args, **kwargs)
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def clear_widgets(self, *args, **kwargs):
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if self.container:
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return self.container.clear_widgets(*args, **kwargs)
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return super(DropDown, self).clear_widgets(*args, **kwargs)
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def on_motion(self, etype, me):
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super().on_motion(etype, me)
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return True
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def on_touch_down(self, touch):
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self._touch_started_inside = self.collide_point(*touch.pos)
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if not self.auto_dismiss or self._touch_started_inside:
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super(DropDown, self).on_touch_down(touch)
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return True
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def on_touch_move(self, touch):
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if not self.auto_dismiss or self._touch_started_inside:
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super(DropDown, self).on_touch_move(touch)
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return True
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def on_touch_up(self, touch):
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# Explicitly test for False as None occurs when shown by on_touch_down
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if self.auto_dismiss and self._touch_started_inside is False:
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self.dismiss()
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else:
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super(DropDown, self).on_touch_up(touch)
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self._touch_started_inside = None
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return True
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def _reposition(self, *largs):
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# calculate the coordinate of the attached widget in the window
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# coordinate system
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win = self._win
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if not win:
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return
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widget = self.attach_to
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if not widget or not widget.get_parent_window():
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return
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wx, wy = widget.to_window(*widget.pos)
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wright, wtop = widget.to_window(widget.right, widget.top)
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if self.auto_width:
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self.width = wright - wx
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# ensure the dropdown list doesn't get out on the X axis, with a
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# preference to 0 in case the list is too wide.
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x = wx
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if x + self.width > win.width:
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x = win.width - self.width
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if x < 0:
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x = 0
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self.x = x
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# determine if we display the dropdown upper or lower to the widget
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if self.max_height is not None:
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height = min(self.max_height, self.container.minimum_height)
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else:
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height = self.container.minimum_height
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h_bottom = wy - height
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h_top = win.height - (wtop + height)
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if h_bottom > 0:
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self.top = wy
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self.height = height
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elif h_top > 0:
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self.y = wtop
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self.height = height
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else:
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# none of both top/bottom have enough place to display the
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# widget at the current size. Take the best side, and fit to
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# it.
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if h_top < h_bottom:
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self.top = self.height = wy
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else:
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self.y = wtop
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self.height = win.height - wtop
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if __name__ == '__main__':
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from kivy.uix.button import Button
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from kivy.base import runTouchApp
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def show_dropdown(button, *largs):
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dp = DropDown()
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dp.bind(on_select=lambda instance, x: setattr(button, 'text', x))
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for i in range(10):
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item = Button(text='hello %d' % i, size_hint_y=None, height=44)
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item.bind(on_release=lambda btn: dp.select(btn.text))
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dp.add_widget(item)
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dp.open(button)
|
||
|
|
|
||
|
|
def touch_move(instance, touch):
|
||
|
|
instance.center = touch.pos
|
||
|
|
|
||
|
|
btn = Button(text='SHOW', size_hint=(None, None), pos=(300, 200))
|
||
|
|
btn.bind(on_release=show_dropdown, on_touch_move=touch_move)
|
||
|
|
|
||
|
|
runTouchApp(btn)
|