94 lines
3.1 KiB
Python
94 lines
3.1 KiB
Python
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'''
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Scatter Layout
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===============
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.. versionadded:: 1.6.0
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This layout behaves just like a
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:class:`~kivy.uix.relativelayout.RelativeLayout`.
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When a widget is added with position = (0,0) to a :class:`ScatterLayout`,
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the child widget will also move when you change the position of the
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:class:`ScatterLayout`. The child widget's coordinates remain
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(0,0) as they are relative to the parent layout.
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However, since :class:`ScatterLayout` is implemented using a
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:class:`~kivy.uix.scatter.Scatter`
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widget, you can also translate, rotate and scale the layout using touches
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or clicks, just like in the case of a normal Scatter widget, and the child
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widgets will behave as expected.
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In contrast to a Scatter, the Layout favors 'hint' properties, such as
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size_hint, size_hint_x, size_hint_y and pos_hint.
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.. note::
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The :class:`ScatterLayout` is implemented as a
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:class:`~kivy.uix.floatlayout.FloatLayout`
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inside a :class:`~kivy.uix.scatter.Scatter`.
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.. warning::
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Since the actual :class:`ScatterLayout` is a
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:class:`~kivy.uix.scatter.Scatter`, its
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add_widget and remove_widget functions are overridden to add children
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to the embedded :class:`~kivy.uix.floatlayout.FloatLayout` (accessible as
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the `content` property of :class:`~kivy.uix.scatter.Scatter`)
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automatically. So if you want to access the added child elements,
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you need self.content.children instead of self.children.
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.. warning::
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The :class:`ScatterLayout` was introduced in 1.7.0 and was called
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:class:`~kivy.uix.relativelayout.RelativeLayout` in prior versions.
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The :class:`~kivy.uix.relativelayout.RelativeLayout` is now an optimized
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implementation that uses only a positional transform to avoid some of the
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heavier calculation involved for :class:`~kivy.uix.scatter.Scatter`.
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'''
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__all__ = ('ScatterLayout', 'ScatterPlaneLayout')
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from kivy.uix.floatlayout import FloatLayout
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from kivy.uix.scatter import Scatter, ScatterPlane
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from kivy.properties import ObjectProperty
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class ScatterLayout(Scatter):
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'''ScatterLayout class, see module documentation for more information.
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'''
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content = ObjectProperty()
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def __init__(self, **kw):
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self.content = FloatLayout()
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super(ScatterLayout, self).__init__(**kw)
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if self.content.size != self.size:
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self.content.size = self.size
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super(ScatterLayout, self).add_widget(self.content)
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self.fbind('size', self.update_size)
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def update_size(self, instance, size):
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self.content.size = size
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def add_widget(self, *args, **kwargs):
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self.content.add_widget(*args, **kwargs)
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def remove_widget(self, *args, **kwargs):
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self.content.remove_widget(*args, **kwargs)
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def clear_widgets(self, *args, **kwargs):
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self.content.clear_widgets(*args, **kwargs)
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class ScatterPlaneLayout(ScatterPlane):
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'''ScatterPlaneLayout class, see module documentation for more information.
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Similar to ScatterLayout, but based on ScatterPlane - so the input is not
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bounded.
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.. versionadded:: 1.9.0
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'''
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def collide_point(self, x, y):
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return True
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