467 lines
12 KiB
Python
Executable File
467 lines
12 KiB
Python
Executable File
"""
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Components/Label
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================
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.. rubric:: The :class:`MDLabel` widget is for rendering text.
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/label.png
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:align: center
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- MDLabel_
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- MDIcon_
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.. MDLabel:
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MDLabel
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-------
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Class :class:`MDLabel` inherited from the :class:`~kivy.uix.label.Label` class
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but for :class:`MDLabel` the ``text_size`` parameter is ``(self.width, None)``
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and default is positioned on the left:
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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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MDBoxLayout:
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orientation: "vertical"
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MDTopAppBar:
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title: "MDLabel"
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MDLabel:
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text: "MDLabel"
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'''
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class Test(MDApp):
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def build(self):
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return Builder.load_string(KV)
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Test().run()
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/md-label-to-left.png
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:align: center
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.. Note:: See :attr:`~kivy.uix.label.Label.halign`
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and :attr:`~kivy.uix.label.Label.valign` attributes
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of the :class:`~kivy.uix.label.Label` class
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.. code-block:: kv
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MDLabel:
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text: "MDLabel"
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halign: "center"
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/md-label-to-center.png
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:align: center
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:class:`~MDLabel` color:
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------------------------
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:class:`~MDLabel` provides standard color themes for label color management:
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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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from kivymd.uix.label import MDLabel
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KV = '''
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MDScreen:
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MDBoxLayout:
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id: box
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orientation: "vertical"
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MDTopAppBar:
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title: "MDLabel"
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'''
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class Test(MDApp):
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def build(self):
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screen = Builder.load_string(KV)
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# Names of standard color themes.
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for name_theme in [
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"Primary",
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"Secondary",
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"Hint",
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"Error",
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"ContrastParentBackground",
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]:
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screen.ids.box.add_widget(
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MDLabel(
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text=name_theme,
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halign="center",
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theme_text_color=name_theme,
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)
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)
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return screen
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Test().run()
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/md-label-theme-text-color.png
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:align: center
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To use a custom color for :class:`~MDLabel`, use a theme `'Custom'`.
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After that, you can specify the desired color in the ``rgba`` format
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in the ``text_color`` parameter:
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.. code-block:: kv
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MDLabel:
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text: "Custom color"
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halign: "center"
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theme_text_color: "Custom"
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text_color: 0, 0, 1, 1
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/md-label-custom-color.png
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:align: center
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:class:`~MDLabel` provides standard font styles for labels. To do this,
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specify the name of the desired style in the :attr:`~MDLabel.font_style`
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parameter:
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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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from kivymd.uix.label import MDLabel
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from kivymd.font_definitions import theme_font_styles
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KV = '''
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MDScreen:
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MDBoxLayout:
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orientation: "vertical"
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MDTopAppBar:
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title: "MDLabel"
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ScrollView:
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MDList:
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id: box
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'''
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class Test(MDApp):
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def build(self):
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screen = Builder.load_string(KV)
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# Names of standard font styles.
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for name_style in theme_font_styles[:-1]:
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screen.ids.box.add_widget(
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MDLabel(
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text=f"{name_style} style",
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halign="center",
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font_style=name_style,
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)
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)
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return screen
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Test().run()
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/md-label-font-style.gif
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:align: center
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.. MDIcon:
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MDIcon
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-------
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You can use labels to display material design icons using the
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:class:`~MDIcon` class.
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.. seealso::
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`Material Design Icons <https://materialdesignicons.com/>`_
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`Material Design Icon Names <https://github.com/kivymd/KivyMD/blob/master/kivymd/icon_definitions.py>`_
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The :class:`~MDIcon` class is inherited from
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:class:`~MDLabel` and has the same parameters.
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.. Warning:: For the :class:`~MDIcon` class, you cannot use ``text``
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and ``font_style`` options!
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.. code-block:: kv
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MDIcon:
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icon: "gmail"
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pos_hint: {"center_x": .5, "center_y": .5}
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/md-icon.png
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:align: center
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MDIcon with badge icon
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----------------------
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.. code-block:: kv
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MDIcon:
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icon: "gmail"
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badge_icon: "numeric-10"
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pos_hint: {"center_x": .5, "center_y": .5}
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/md-icon-badge.png
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:align: center
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"""
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__all__ = ("MDLabel", "MDIcon")
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import os
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from typing import Union
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from kivy.clock import Clock
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from kivy.lang import Builder
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from kivy.metrics import sp
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from kivy.properties import (
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AliasProperty,
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BooleanProperty,
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ColorProperty,
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NumericProperty,
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OptionProperty,
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StringProperty,
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)
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from kivy.uix.label import Label
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from kivymd import uix_path
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from kivymd.theming import ThemableBehavior
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from kivymd.theming_dynamic_text import get_contrast_text_color
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from kivymd.uix import MDAdaptiveWidget
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from kivymd.uix.behaviors import DeclarativeBehavior
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from kivymd.uix.floatlayout import MDFloatLayout
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__MDLabel_colors__ = {
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"Primary": "text_color",
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"Secondary": "secondary_text_color",
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"Hint": "disabled_hint_text_color",
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"Error": "error_color",
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"OP": {
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"Primary": "opposite_text_color",
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"Secondary": "opposite_secondary_text_color",
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"Hint": "opposite_disabled_hint_text_color",
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},
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}
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with open(
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os.path.join(uix_path, "label", "label.kv"), encoding="utf-8"
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) as kv_file:
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Builder.load_string(kv_file.read())
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class MDLabel(DeclarativeBehavior, ThemableBehavior, Label, MDAdaptiveWidget):
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font_style = StringProperty("Body1")
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"""
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Label font style.
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Available vanilla font_style are: `'H1'`, `'H2'`, `'H3'`, `'H4'`, `'H5'`,
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`'H6'`, `'Subtitle1'`, `'Subtitle2'`, `'Body1'`, `'Body2'`, `'Button'`,
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`'Caption'`, `'Overline'`, `'Icon'`.
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:attr:`font_style` is an :class:`~kivy.properties.StringProperty`
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and defaults to `'Body1'`.
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"""
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_capitalizing = BooleanProperty(False)
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def _get_text(self):
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if self._capitalizing:
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return self._text.upper()
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return self._text
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def _set_text(self, value):
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self._text = value
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_text = StringProperty()
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text = AliasProperty(_get_text, _set_text, bind=["_text", "_capitalizing"])
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"""Text of the label."""
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theme_text_color = OptionProperty(
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"Primary",
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allownone=True,
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options=[
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"Primary",
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"Secondary",
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"Hint",
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"Error",
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"Custom",
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"ContrastParentBackground",
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],
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)
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"""
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Label color scheme name.
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Available options are: `'Primary'`, `'Secondary'`, `'Hint'`, `'Error'`,
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`'Custom'`, `'ContrastParentBackground'`.
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:attr:`theme_text_color` is an :class:`~kivy.properties.OptionProperty`
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and defaults to `None`.
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"""
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text_color = ColorProperty(None)
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"""
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Label text color in (r, g, b, a) format.
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:attr:`text_color` is an :class:`~kivy.properties.ColorProperty`
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and defaults to `None`.
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"""
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_text_color_str = StringProperty()
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parent_background = ColorProperty(None)
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can_capitalize = BooleanProperty(True)
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def __init__(self, **kwargs):
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super().__init__(**kwargs)
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self.bind(
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font_style=self.update_font_style,
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can_capitalize=self.update_font_style,
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)
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self.on_theme_text_color(None, self.theme_text_color)
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self.update_font_style(None, "")
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self.on_opposite_colors(None, self.opposite_colors)
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Clock.schedule_once(self.check_font_styles)
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self.theme_cls.bind(theme_style=self._do_update_theme_color)
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def check_font_styles(self, interval: Union[int, float] = 0) -> bool:
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if self.font_style not in list(self.theme_cls.font_styles.keys()):
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raise ValueError(
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f"MDLabel.font_style is set to an invalid option '{self.font_style}'."
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f"Must be one of: {list(self.theme_cls.font_styles)}"
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)
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else:
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return True
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def update_font_style(self, instance_label, font_style: str) -> None:
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if self.check_font_styles() is True:
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font_info = self.theme_cls.font_styles[self.font_style]
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self.font_name = font_info[0]
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self.font_size = sp(font_info[1])
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if font_info[2] and self.can_capitalize:
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self._capitalizing = True
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else:
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self._capitalizing = False
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# TODO: Add letter spacing change
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# self.letter_spacing = font_info[3]
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def on_theme_text_color(
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self, instance_label, theme_text_color: str
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) -> None:
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op = self.opposite_colors
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if op:
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self._text_color_str = __MDLabel_colors__.get("OP", "").get(
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theme_text_color, ""
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)
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else:
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self._text_color_str = __MDLabel_colors__.get(theme_text_color, "")
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if self._text_color_str:
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self._do_update_theme_color()
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else:
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# 'Custom' and 'ContrastParentBackground' lead here, as well as the
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# generic None value it's not yet been set
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self._text_color_str = ""
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if theme_text_color == "Custom" and self.text_color:
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self.color = self.text_color
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elif (
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theme_text_color == "ContrastParentBackground"
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and self.parent_background
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):
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self.color = get_contrast_text_color(self.parent_background)
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else:
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self.color = [0, 0, 0, 1]
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def on_text_color(self, instance_label, color: list) -> None:
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if self.theme_text_color == "Custom":
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self.color = self.text_color
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def on_opposite_colors(self, *args) -> None:
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self.on_theme_text_color(self, self.theme_text_color)
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def _do_update_theme_color(self, *args):
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if self._text_color_str:
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self.color = getattr(self.theme_cls, self._text_color_str)
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if not self.disabled:
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self.color = getattr(self.theme_cls, self._text_color_str)
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else:
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self.color = getattr(self.theme_cls, "disabled_hint_text_color")
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class MDIcon(MDFloatLayout, MDLabel):
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icon = StringProperty("android")
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"""
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Label icon name.
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:attr:`icon` is an :class:`~kivy.properties.StringProperty`
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and defaults to `'android'`.
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"""
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badge_icon = StringProperty()
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"""
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Label badge icon name.
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.. versionadded:: 1.0.0
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:attr:`badge_icon` is an :class:`~kivy.properties.StringProperty`
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and defaults to `''`.
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"""
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badge_icon_color = ColorProperty([1, 1, 1, 1])
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"""
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Badge icon color in (r, g, b, a) format.
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.. versionadded:: 1.0.0
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:attr:`badge_icon_color` is an :class:`~kivy.properties.ColorProperty`
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and defaults to `None`.
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"""
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badge_bg_color = ColorProperty(None)
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"""
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Badge icon background color in (r, g, b, a) format.
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.. versionadded:: 1.0.0
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:attr:`badge_bg_color` is an :class:`~kivy.properties.ColorProperty`
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and defaults to `None`.
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"""
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badge_font_size = NumericProperty()
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"""
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Badge font size.
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.. versionadded:: 1.0.0
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:attr:`badge_font_size` is an :class:`~kivy.properties.NumericProperty`
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and defaults to `0`.
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"""
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source = StringProperty(None, allownone=True)
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"""
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Path to icon.
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:attr:`source` is an :class:`~kivy.properties.StringProperty`
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and defaults to `None`.
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"""
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def __init__(self, **kwargs):
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from kivymd.uix.selectioncontrol import MDCheckbox
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super().__init__(**kwargs)
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if not isinstance(self, MDCheckbox):
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self.size_hint = (None, None)
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self.size = self.texture_size
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self.adaptive_size = True
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