Components Progress Loader

Example of using MDProgressLoader:

import os
from kivy.lang import Builder
from kivy.factory import Factory
from kivymd.app import MDApp
from kivymd.uix.progressloader import MDProgressLoader
from kivymd.toast import toast


Builder.load_string(
    """
<Root@BoxLayout>:
    orientation: "vertical"
    spacing: dp(5)

    MDToolbar:
        id: toolbar
        title: app.title
        left_action_items: [["menu", lambda x: None]]
        elevation: 10
        md_bg_color: app.theme_cls.primary_color

    FloatLayout:
        id: box

        MDRoundFlatIconButton:
            text: "Download file"
            icon: "download"
            pos_hint: {"center_x": 0.5, "center_y": 0.6}
            on_release: app.show_example_download_file()
"""
)


class MainApp(MDApp):
    def __init__(self, **kwargs):
        self.title = "KivyMD Examples - Progress Loader"
        self.theme_cls.primary_palette = "Teal"
        super().__init__(**kwargs)

    def build(self):
        self.root = Factory.Root()

    def set_chevron_back_screen(self):
        """Sets the return chevron to the previous screen in ToolBar."""

        self.root.ids.toolbar.right_action_items = []

    def download_progress_hide(self, instance_progress, value):
        """Hides progress progress."""

        self.root.ids.toolbar.right_action_items = [
            ["download", lambda x: self.download_progress_show(instance_progress)]
        ]

    def download_progress_show(self, instance_progress):
        self.set_chevron_back_screen()
        instance_progress.open()
        instance_progress.animation_progress_from_fade()

    def show_example_download_file(self):
        link = "https://www.python.org/ftp/python/3.5.1/python-3.5.1-embed-win32.zip"
        progress = MDProgressLoader(
            url_on_image=link,
            path_to_file=os.path.join(self.directory, "python-3.5.1.zip"),
            download_complete=self.download_complete,
            download_hide=self.download_progress_hide,
        )
        progress.start(self.root.ids.box)

    def download_complete(self):
        self.set_chevron_back_screen()
        toast("Done")


if __name__ == "__main__":
    MainApp().run()