Kivy for android in action: Toolbox 5: Fasta Editor

CryptoWatch-Kivy          1.13
Kivy                      2.0.0
Kivy-Garden               0.1.4
kivy-garden.wordcloud     1.0.0
kivymd                    0.104.2.dev0

Quick Review

tree

.
├── bin
│   └── KarobbenTB-1.3-armeabi-v7a-debug.apk
├── buildozer.spec
├── favicon.ico
├── font
│   ├── ArtificialBox-WdD4.ttf
|   ...
│   └── JingDianFanJiaoZhuan-1.ttf
├── Layout
│   ├── filechooser.kv
│   ├── menu.kv
│   ├── Navigation_Draw.kv
│   ├── Navigation_Tabs.kv
│   └── Seq.kv
├── lib
│   └── bio_seq.py
├── libWidget
│   ├── filechooser.py
│   ├── main.py
│   ├── menu.py
│   └── Seq.py
├── logo.png
└── main.py

Function for Close Tab

Raw file

Added to widget

touch libWidget/editor.py
touch libWidget/editor.kv

editor.py

editor.py

from kivy.lang import Builder
from kivy.uix.popup import Popup
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.screenmanager import Screen
from kivy.properties import ObjectProperty
from kivy.utils import platform
import os

class LoadDialog(FloatLayout):
    load = ObjectProperty(None)
    cancel = ObjectProperty(None)

class SaveDialog(FloatLayout):
    save = ObjectProperty(None)
    text_input = ObjectProperty(None)
    cancel = ObjectProperty(None)

class FunctionWidget():


    def main(self):
        self.popup = Popup(title="Select .zip file",
                           content=None,
                           size_hint=(None, None),
                           size=(500, 500),
                           auto_dismiss=True)

        Builder.unload_file("Layout/editor.kv")
        self.Function_page = Builder.load_file("Layout/editor.kv")
        # select a file
        self.Function_page.ids.button_load.on_release = self.show_load
        # save the file
        self.Function_page.ids.button_save.on_release = self.show_save

        return self.Function_page


    def dismiss_popup(self):
        self._popup.dismiss()

    def show_load(self):
        content = LoadDialog(load=self.load, cancel=self.dismiss_popup)
        PATH = "."
        if platform == "android":
          from android.permissions import request_permissions, Permission
          request_permissions([Permission.READ_EXTERNAL_STORAGE, Permission.WRITE_EXTERNAL_STORAGE])
          app_folder = os.path.dirname(os.path.abspath(__file__))
          PATH = "/storage/emulated/0" #app_folder
        content.ids.filechooser.path = PATH

        self._popup = Popup(title="Load file", content=content,
                            size_hint=(0.9, 0.9))
        self._popup.open()

    def show_save(self):
        content = SaveDialog(save=self.save, cancel=self.dismiss_popup)
        PATH = "."
        if platform == "android":
          from android.permissions import request_permissions, Permission
          request_permissions([Permission.READ_EXTERNAL_STORAGE, Permission.WRITE_EXTERNAL_STORAGE])
          app_folder = os.path.dirname(os.path.abspath(__file__))
          PATH = "/storage/emulated/0" #app_folder
        content.ids.filechooser.path = PATH
        self._popup = Popup(title="Save file", content=content,
                            size_hint=(0.9, 0.9))
        self._popup.open()

    def load(self, path, filename):
        with open(os.path.join(path, filename[0])) as stream:
            try:
                self.Function_page.ids.text_input.text = stream.read()
            except:
                self.Function_page.ids.text_input.text = "Error, can't open this file"

        self.dismiss_popup()

    def save(self, path, filename):
        with open(os.path.join(path, filename), 'w') as stream:
            stream.write(self.Function_page.ids.text_input.text)

        self.dismiss_popup()

editor.kv

editor.kv

BoxLayout:
    orientation: 'vertical'
    BoxLayout:
        size_hint_y: None
        height: 30
        Button:
            id: button_load
            text: 'Load'
        Button:
            id: button_save
            text: 'Save'

    BoxLayout:
        TextInput:
            id: text_input
            text: ''

<LoadDialog>:
    BoxLayout:
        size: root.size
        pos: root.pos
        orientation: "vertical"
        FileChooserListView:
            id: filechooser
            path: "."

        BoxLayout:
            size_hint_y: None
            height: 30
            Button:
                id: test
                text: "Cancel"
                on_release: root.cancel()

            Button:
                text: "Load"
                on_release: root.load(filechooser.path, filechooser.selection)


<SaveDialog>:
    text_input: text_input
    BoxLayout:
        size: root.size
        pos: root.pos
        orientation: "vertical"
        FileChooserListView:
            id: filechooser
            on_selection: text_input.text = self.selection and self.selection[0] or ''

        TextInput:
            id: text_input
            size_hint_y: None
            height: 30
            multiline: False

        BoxLayout:
            size_hint_y: None
            height: 30
            Button:
                text: "Cancel"
                on_release: root.cancel()

            Button:
                text: "Save"
                on_release: root.save(filechooser.path, text_input.text)

digraph{ rankdir = "LR" mm1 [label ="", height = 0, width = 0, shape = none] mm2 [label ="", height = 0, width = 0, shape = none] mm3 [label ="", height = 0, width = 0, shape = none] mm4 [label ="", height = 0, width = 0, shape = none] mm5 [label ="", height = 0, width = 0, shape = none] mm6 [label ="", height = 0, width = 0, shape = none] mm7 [label ="", height = 0, width = 0, shape = none] mm8 [label ="", height = 0, width = 0, shape = none] mm9 [label ="", height = 0, width = 0, shape = none] Navigation [URL="/2021/04/26/Python/kivy-inaction-tb-1/#Navigation", fontcolor = "#3273DC"] Navigation_S [URL="/2021/04/26/Python/kivy-inaction-tb-1/#Separate-the-KV-and-PY", fontcolor = "#3273DC"] Tags [URL ="/2021/04/26/Python/kivy-inaction-tb-1/#Tags", fontcolor = "#3273DC"] FF [label="Font Switch"; URL ="/2021/04/26/Python/kivy-inaction-tb-1/#First-Function", fontcolor = "#3273DC"] FileChooser [label="File Chooser"; URL ="/2021/04/28/Python/kivy-inaction-tb-2/#Filechooser", fontcolor = "#3273DC"] Menu [label="Menu"; URL ="/2021/04/30/Python/kivy-inaction-tb-3/#Write-is-as-a-widget", fontcolor = "#3273DC"] Editor [label="Editor"; URL ="/2021/05/08/Python/kivy-inaction-tb-6/", fontcolor = "#3273DC"] node [shape = "box"] Navigation_S [label = "Separate the KV and PY"] Navigation -> mm2 mm3 -> Navigation_S [dir=back] Tags -> mm4 mm5 -> FF -> Slider[dir=back] FileChooser -> mm6 mm7 -> Menu [dir=back] Menu -> FF mm8-> Editor [dir = back] subgraph A{ rank = same mm1 -> mm2 -> mm3 -> mm4 -> mm5 -> mm6 -> mm7 -> mm8 -> mm9 [dir = "none"] } }