StreamController/src/windows/AssetManager/DynamicFlowBox.py at main · SithTech/StreamController · GitHub

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"""

Year: 2024

This program is free software: you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation, either version 3 of the License, or

any later version.

This programm comes with ABSOLUTELY NO WARRANTY!

You should have received a copy of the GNU General Public License

along with this program. If not, see <https://www.gnu.org/licenses/>.

"""

# Import gtk modules

import gi

gi.require_version("Gtk", "4.0")

gi.require_version("Adw", "1")

from gi.repository import Gtk, Gdk, GLib

# Import python modules

import functools

class DynamicFlowBox(Gtk.Box):

def __init__(self, base_class: type, *args, **kwargs):

"""

base_class: The class of the items in the flow box. Its constructor is not allowed to require any arguments because empty

placeholder objects will be created in the flowbox.

You have to use the factory to configure the items.

"""

super().__init__(*args, **kwargs)

self.set_orientation(Gtk.Orientation.VERTICAL)

self.N_ITEMS_PER_PAGE = 50

self.base_class = base_class

self.items: list = []

self.sort_func: callable = None

self.filter_func: callable = None

self.factory_func: callable = None

self.build()

self.generate_placeholders()

def build(self):

self.scrolled_window = Gtk.ScrolledWindow(hexpand=True, vexpand=True)

self.append(self.scrolled_window)

self.scrolled_box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)

self.scrolled_window.set_child(self.scrolled_box)

self.flow_box = Gtk.FlowBox(hexpand=True, orientation=Gtk.Orientation.HORIZONTAL,

selection_mode=Gtk.SelectionMode.SINGLE)

self.scrolled_box.append(self.flow_box)

# Fix stretch

self.scrolled_box.append(Gtk.Box(vexpand=True))

self.nav_box = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL, hexpand=True,

margin_top=15, margin_bottom=15, margin_start=15, margin_end=15)

self.append(self.nav_box)

self.back_button = Gtk.Button(icon_name="go-previous-symbolic")

self.back_button.connect("clicked", self.on_back)

self.nav_box.append(self.back_button)

self.nav_box.append(Gtk.Box(hexpand=True))

self.next_button = Gtk.Button(icon_name="go-next-symbolic")

self.next_button.connect("clicked", self.on_next)

self.nav_box.append(self.next_button)

def generate_placeholders(self):

for i in range(self.N_ITEMS_PER_PAGE):

placeholder = self.base_class()

self.flow_box.append(placeholder)

def filter_items(self, items: list):

if not callable(self.filter_func):

return items

filtered_items = []

for item in items:

if self.filter_func(item):

filtered_items.append(item)

return filtered_items

def sort_items(self, items: list):

if not callable(self.sort_func):

return items

return sorted(items, key=functools.cmp_to_key(self.sort_func))

def get_items_to_show(self) -> list:

filtered_items = self.filter_items(self.items)

sorted_items = self.sort_items(filtered_items)

return sorted_items

def show_range(self, start: int, end: int) -> None:

if not callable(self.factory_func):

raise ValueError("factory_func must be callable")

items = self.get_items_to_show()

self.current_start_index = start

for i, item in enumerate(items[start:end]):

preview = self.flow_box.get_child_at_index(i)

if preview is None:

return

preview.set_visible(True)

# self.factory_func(preview, item)

GLib.idle_add(self.factory_func, preview, item)

# Hide left over placeholders

for i in range(len(items[start:end]), self.N_ITEMS_PER_PAGE):

preview = self.flow_box.get_child_at_index(i)

if preview is None:

return

preview.set_visible(False)

if start == 0:

self.back_button.set_sensitive(False)

else:

self.back_button.set_sensitive(True)

if end < len(items):

self.next_button.set_sensitive(True)

else:

self.next_button.set_sensitive(False)

def on_next(self, *args):

self.current_start_index += self.N_ITEMS_PER_PAGE

self.show_range(self.current_start_index, self.current_start_index + self.N_ITEMS_PER_PAGE)

def on_back(self, *args):

self.current_start_index -= self.N_ITEMS_PER_PAGE

self.show_range(self.current_start_index, self.current_start_index + self.N_ITEMS_PER_PAGE)

def set_item_list(self, items: list) -> None:

self.items = items

def set_factory(self, factory_func: callable) -> None:

self.factory_func = factory_func

def set_sort_func(self, sort_func: callable) -> None:

self.sort_func = sort_func

def set_filter_func(self, filter_func: callable) -> None:

self.filter_func = filter_func

StreamController/src/windows/AssetManager/DynamicFlowBox.py at main · SithTech/StreamController · GitHub

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