231 lines
6.2 KiB
Python
231 lines
6.2 KiB
Python
"""
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Components/FitImage
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===================
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Feature to automatically crop a `Kivy` image to fit your layout
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Write by Benedikt Zwölfer
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Referene - https://gist.github.com/benni12er/95a45eb168fc33a4fcd2d545af692dad
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Example:
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========
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.. tabs::
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.. tab:: Declarative KV styles
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.. code-block:: kv
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MDBoxLayout:
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size_hint_y: None
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height: "200dp"
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orientation: 'vertical'
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FitImage:
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size_hint_y: 3
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source: 'images/img1.jpg'
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FitImage:
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size_hint_y: 1
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source: 'images/img2.jpg'
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.. tab:: Declarative python styles
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.. code-block:: python
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MDBoxLayout(
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FitImage(
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size_hint_y=.3,
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source='images/img1.jpg',
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),
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FitImage(
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size_hint_y=.7,
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source='images/img2.jpg',
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),
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size_hint_y=None,
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height="200dp",
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orientation='vertical',
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)
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Example with round corners:
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===========================
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/fitimage-round-corners.png
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:align: center
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.. tabs::
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.. tab:: Declarative KV styles
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.. code-block:: python
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from kivy.lang import Builder
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from kivymd.app import MDApp
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KV = '''
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MDScreen:
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MDCard:
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radius: 36
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md_bg_color: "grey"
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pos_hint: {"center_x": .5, "center_y": .5}
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size_hint: .4, .8
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FitImage:
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source: "bg.jpg"
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size_hint_y: .35
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pos_hint: {"top": 1}
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radius: 36, 36, 0, 0
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'''
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class Example(MDApp):
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def build(self):
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self.theme_cls.theme_style = "Dark"
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return Builder.load_string(KV)
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Example().run()
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.. tab:: Declarative python styles
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.. code-block:: python
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from kivymd.app import MDApp
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from kivymd.uix.card import MDCard
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from kivymd.uix.fitimage import FitImage
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from kivymd.uix.screen import MDScreen
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class Example(MDApp):
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def build(self):
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self.theme_cls.theme_style = "Dark"
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return (
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MDScreen(
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MDCard(
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FitImage(
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source="bg.jpg",
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size_hint_y=0.35,
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pos_hint={"top": 1},
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radius=(36, 36, 0, 0),
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),
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radius=36,
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md_bg_color="grey",
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pos_hint={"center_x": .5, "center_y": .5},
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size_hint=(0.4, 0.8),
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),
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)
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)
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Example().run()
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"""
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__all__ = ("FitImage",)
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from kivy.clock import Clock
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from kivy.graphics.context_instructions import Color
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from kivy.graphics.vertex_instructions import Rectangle
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from kivy.properties import BooleanProperty, ObjectProperty
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from kivy.uix.image import AsyncImage
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from kivy.uix.widget import Widget
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from kivymd.uix.behaviors import StencilBehavior
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from kivymd.uix.boxlayout import MDBoxLayout
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class FitImage(MDBoxLayout, StencilBehavior):
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source = ObjectProperty()
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"""
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Filename/source of your image.
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:attr:`source` is a :class:`~kivy.properties.StringProperty`
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and defaults to None.
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"""
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mipmap = BooleanProperty(False)
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"""
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Indicate if you want OpenGL mipmapping to be applied to the texture.
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Read :ref:`mipmap` for more information.
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.. versionadded:: 1.0.0
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:attr:`mipmap` is a :class:`~kivy.properties.BooleanProperty`
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and defaults to `False`.
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"""
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_container = ObjectProperty()
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def __init__(self, **kwargs):
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super().__init__(**kwargs)
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Clock.schedule_once(self._late_init)
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def _late_init(self, *args):
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self._container = Container(self.source, self.mipmap)
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self.bind(source=self._container.setter("source"))
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self.add_widget(self._container)
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def reload(self):
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self._container.image.reload()
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class Container(Widget):
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source = ObjectProperty()
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image = ObjectProperty()
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def __init__(self, source, mipmap, **kwargs):
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super().__init__(**kwargs)
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self.image = AsyncImage(mipmap=mipmap)
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self.loader_clock = Clock.schedule_interval(
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self.adjust_size, self.image.anim_delay
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)
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self.image.bind(
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on_load=lambda inst: (
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self.adjust_size(),
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self.loader_clock.cancel(),
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)
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)
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self.source = source
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self.bind(size=self.adjust_size, pos=self.adjust_size)
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def on_source(self, instance, value):
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if isinstance(value, str):
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self.image.source = value
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else:
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self.image.texture = value
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self.adjust_size()
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def adjust_size(self, *args):
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if not self.parent or not self.image.texture:
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return
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(par_x, par_y) = self.parent.size
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if par_x == 0 or par_y == 0:
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with self.canvas:
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self.canvas.clear()
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return
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par_scale = par_x / par_y
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(img_x, img_y) = self.image.texture.size
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img_scale = img_x / img_y
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if par_scale > img_scale:
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(img_x_new, img_y_new) = (img_x, img_x / par_scale)
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else:
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(img_x_new, img_y_new) = (img_y * par_scale, img_y)
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crop_pos_x = (img_x - img_x_new) / 2
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crop_pos_y = (img_y - img_y_new) / 2
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subtexture = self.image.texture.get_region(
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crop_pos_x, crop_pos_y, img_x_new, img_y_new
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)
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with self.canvas:
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self.canvas.clear()
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Color(1, 1, 1)
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Rectangle(texture=subtexture, pos=self.pos, size=(par_x, par_y))
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