RecycleView line splitting behavior exampl app

line_split.py

from kivy.properties import NumericProperty, ListProperty, StringProperty
from time import time
import copy


class LineSplitBehavior(object):
    split_text_key = StringProperty('text')
    split_text_indent = NumericProperty(4)
    chars_per_line = NumericProperty(100)
    _unsplit_data = ListProperty()

    def __init__(self, **kwargs):
        super(LineSplitBehavior, self).__init__(**kwargs)
        self.fbind('chars_per_line', self.line_split_reload)

    def set_data(self, data_full, update_unsplitted=True):
        if update_unsplitted:
            if data_full:
                key = self.split_text_key
                self._unsplit_data = [copy.copy(x) for x in data_full]
            else:
                self._unsplit_data = []
        if data_full:
            data_full = self.get_line_split_data(data_full)

        try:
            super(LineSplitBehavior, self).set_data(data_full)
        except AttributeError:
            self.data = data_full

    def get_line_split_data(self, data_full):
        new_data0 = []
        new_data = []
        cpl = self.chars_per_line
        key = self.split_text_key

        # Do fast splitting with new line characters before doing word
        # length calculations
        for x in data_full:
            split_text = x[key].splitlines()
            if len(split_text) > 1:
                for text in split_text:
                    new_dict = copy.copy(x)
                    new_dict[key] = text
                    new_data0.append(new_dict)
            else:
                new_data0.append(x)

        for x in new_data0:
            # If text does not fit in one line, start splitting it
            if len(x[key]) > cpl:
                words = x[key].split(' ')

                new_lines = []
                new_line = ''
                for word in words:
                    len_line = len(new_line)
                    len_word = len(word)

                    # When word fits in line character limit,
                    # add it to current line
                    if len_word + len_line < cpl:
                        if new_line:
                            new_line = '%s %s' % (new_line, word)
                        else:
                            new_line = word

                    # When word does not fit in line character limit
                    # append current line and start a new line
                    else:
                        new_lines.append(new_line)
                        new_line = ''

                        # When word fits in the new empty line, add it
                        if len_word < cpl:
                            if new_line:
                                new_line = '%s %s' % (new_line, word)
                            else:
                                new_line = word

                        # When word is longer then character limit,
                        # split it and add multiple lines
                        else:
                            # Calculate line count
                            split_parts = float(len_word) / float(cpl)
                            split_remain = split_parts % int(split_parts)
                            if split_remain:
                                split_parts = int(split_parts) + 1
                            else:
                                split_parts = int(split_parts)

                            # Split word into calculated line count
                            word_split = [
                                word[cpl*i:cpl*(i+1)] for i in range(
                                    split_parts)
                            ]

                            # Add parts of split word to new_lines
                            if split_remain:
                                for word in word_split[:-1]:
                                    new_lines.append(word)
                                new_line = word
                            else:
                                for word in word_split:
                                    new_lines.append(word)

                # Add any remaining text
                if new_line:
                    new_lines.append(new_line)

                # Make data copies and put in text for each line
                for new_line in new_lines:
                    new_dict = copy.copy(x)
                    new_dict[key] = new_line
                    new_data.append(new_dict)
            else:
                # Skip splitting for short text and append the data
                new_data.append(x)

        return new_data

    def line_split_reload(self, _, chars_per_line):
        self.set_data(self._unsplit_data)

main.py

from kivy.uix.recycleview import RecycleView
from kivy.uix.floatlayout import FloatLayout
from kivy.properties import NumericProperty
from line_split import LineSplitBehavior
from kivy.app import runTouchApp
from kivy.lang import Builder
from kivy.clock import Clock
from kivy.logger import Logger
from random import randrange
from kivy.metrics import cm
from time import time

randata = '''Resources exquisite set arranging moonlight cuddle him household had. Months had too ham cousin remove far spirit. She procuring the why performed continual improving. Civil songs so large shade in cause. Lady an mr here must neat sold. Children greatest ye extended delicate of. No elderly passage earnest as in removed winding or.

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Carriage quitting securing be appetite it declared. High eyes kept so busy feel call in. Would day nor ask walls known. But preserved advantage are but and certainty earnestly enjoyment. Passage weather as up am exposed. And natural related man subject. Eagerness get situation his was delighted.

Compliment interested discretion estimating on stimulated apartments oh. Dear so sing when in find read of call. As distrusts behaviour abilities defective is. Never at water me might. On formed merits hunted unable merely by mr whence or. Possession the unpleasing simplicity her uncommonly.

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Offered say visited elderly and. Waited period are played family man formed. He ye body or made on pain part meet. You one delay nor begin our folly abode. By disposed replying mr me unpacked no. As moonlight of my resolving unwilling.

Now for manners use has company believe parlors. Least nor party who wrote while did. Excuse formed as is agreed admire so on result parish. Put use set uncommonly announcing and travelling. Allowance sweetness direction to as necessary. Principle oh explained excellent do my suspected conveying in. Excellent you did therefore perfectly supposing described.

Little afraid its eat looked now. Very ye lady girl them good me make. It hardly cousin me always. An shortly village is raising we shewing replied. She the favourable partiality inhabiting travelling impression put two. His six are entreaties instrument acceptance unsatiable her. Amongst as or on herself chapter entered carried no. Sold old ten are quit lose deal his sent. You correct how cuddle several far distant believe journey parties. We shyness enquire uncivil affixed it carried to.

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'''

class RootWidget(FloatLayout):
    font_size = NumericProperty(cm(0.4))

    def on_ids(self, _, value):
        self.fbind('font_size', self.schedule_line_split_update)
        self.fbind('width', self.schedule_line_split_update)
        Clock.schedule_once(self.ddd, 0.5)

    def ddd(self, *args):
        global randata
        rv = self.ids.rv
        randata = randata * 10
        randata = randata.splitlines()
        new_data = []
        for x in randata:
            randcolor = (
                float(randrange(20, 255, 1)) / 255.0,
                float(randrange(20, 255, 1)) / 255.0,
                float(randrange(20, 255, 1)) / 255.0,
                1)
            new_data.append({'text': x, 'background_color': randcolor})
        rv.set_data(new_data)

    def _update_chars_per_line(self, *args):
        value = int((self.width / self.font_size))
        self.ids.rv.chars_per_line = value
        Logger.info('_update_chars_per_line: %s' % (value))

    def schedule_line_split_update(self, *args):
        Clock.unschedule(self._update_chars_per_line)
        Clock.schedule_once(self._update_chars_per_line, 0.3)

class LnRecycleView(LineSplitBehavior, RecycleView):
    pass


runTouchApp(Builder.load_string('''
<TLabel@Label>:
    size_hint: 1, None
    height: int(cm(0.7))
    font_size: int(cm(0.6))
    font_name: 'RobotoMono-Regular.ttf'
    text_size: self.width, None
    padding: 10, 10
    background_color: 0.2, 0.2, 0.2, 1
    color: 1, 1, 1, 1
    canvas.before:
        Color:
            rgba: self.background_color
        Rectangle:
            pos: self.pos
            size: self.size

RootWidget:
    LnRecycleView:
        id: rv
        size_hint: None, None
        size: root.size
        pos: 0, 0
        viewclass: 'TLabel'
        RecycleBoxLayout:
            orientation: 'vertical'
            size_hint_y: None
            default_size_hint: 1, None
            default_size: None, None
            height: self.minimum_height
            spacing: 2
'''))