♻️ Refactor classes to avoid big ones

Fix #20

src/window/app.py

@@ -0,0 +1,73 @@
+from tkinter import *
+from tkinter import filedialog
+from pathlib import Path
+from src.util import Util
+from functools import partial
+from src.window.image import ImageWindow
+
+
+class App:
+    def __init__(self, root):
+        super().__init__()
+        self.image_window = None
+        self.root = root
+        self.selected_folder = ""
+        self.found_images = []
+        self.timer = 0
+        self.title = Label(root, text="Drawing Training")
+        self.title.pack()
+
+        self.folder_selector = Button(root, text="Select a folder", command=self.select_folder)
+        self.folder_selector.pack()
+
+        self.folder_name = Label(root, text="Folder : " + self.selected_folder)
+        self.folder_name.pack()
+
+        self.images_len = Label(root, text="Found : " + str(len(self.found_images)))
+        self.images_len.pack()
+
+        self.button_frame = Frame(root)
+        self.button_frame.pack(fill=X)
+
+        timers = [30, 45, 60, 120, 300, 600]
+        self.buttons = []
+        i = 0
+        for i in timers:
+            t = i
+            new_button = Button(self.button_frame, text=Util.format_seconds(t),
+                                command=partial(self.set_timer_in_seconds, t))
+
+            self.buttons.append(new_button)
+            self.button_frame.columnconfigure(i, weight=1)
+            new_button.grid(row=0, column=i, sticky=W + E)
+            i += 1
+
+        self.launch_button = Button(root, text="Let's draw!", command=self.lets_draw, state="disabled")
+        self.launch_button.pack(side="bottom")
+
+    def lets_draw(self):
+        self.image_window = ImageWindow(self)
+        self.image_window.lets_draw(self.found_images.copy(), self.timer)
+
+    def select_folder(self):
+        self.selected_folder = filedialog.askdirectory()
+        self.found_images = list(
+            p.resolve() for p in Path(self.selected_folder).glob("**/*") if p.suffix in {".jpg", ".gif", ".png"})
+        self.folder_name.config(text="Folder : " + self.selected_folder)
+        self.images_len.config(text="Found : " + str(len(self.found_images)))
+        self.check_lets_draw()
+
+    def check_lets_draw(self):
+        if self.selected_folder != "" and len(self.found_images) > 0 and self.timer != 0:
+            self.launch_button.config(state="normal")
+        else:
+            self.launch_button.config(state="disabled")
+
+    def set_timer_in_seconds(self, user_data):
+        self.timer = user_data
+        for button in self.buttons:
+            if button['text'] == Util.format_seconds(self.timer):
+                button.config(bg="blue")
+            else:
+                button.config(bg="gray85")
+        self.check_lets_draw()