Begin refactor

src/GUI.py

@@ -0,0 +1,117 @@
+import tkinter as tk
+from tkinter import filedialog
+from PIL import ImageTk
+from ImageContainer import ImageContainer
+
+
+class GUI:
+    """The GUI class responsible for the main application GUI.
+
+    @warning This class is a singleton.
+    """
+    _instance = None
+
+    # If the GUI has been initialised.
+    _isInitialised = False
+
+    _currentImage = None
+
+    def __new__(cls):
+        if cls._instance is None:
+            cls._instance = super(GUI, cls).__new__(cls)
+        return cls._instance
+
+    def initialise(self):
+        """Initialise the GUI."""
+
+        if self._isInitialised:
+            return
+        else:
+            self._isInitialised = True
+
+        # Main window
+        root = tk.Tk()
+        root.title("Image Viewer")
+        root.geometry("800x600")
+        root.config(bg="white")
+        icon = tk.PhotoImage(file='icon.png')
+        root.tk.call('wm', 'iconphoto', root._w, icon)
+        root.minsize(800, 600)
+
+        # Menus
+        menu = tk.Menu(root)
+        root.config(menu=menu)
+        file_menu = tk.Menu(menu, tearoff=0)
+        menu.add_cascade(label="File", menu=file_menu)
+        file_menu.add_command(label="Open Image", command=lambda: self._openImage())
+        file_menu.add_command(label="Save Image", command=lambda: _save_image(OPENED_IMAGE))
+        file_menu.add_command(label="Exit", command=root.quit)
+
+        test_menu = tk.Menu(menu, tearoff=0)
+        menu.add_cascade(label="Test", menu=test_menu)
+        test_menu.add_command(label="Padding", command=lambda: padding(OPENED_IMAGE,
+                                                                       border_width=50) if OPENED_IMAGE is not None else print(
+            "No image opened."))
+        test_menu.add_command(label="Crop", command=lambda: crop(OPENED_IMAGE) if OPENED_IMAGE is not None else print(
+            "No image opened."))
+        test_menu.add_command(label="Resize",
+                              command=lambda: resize(OPENED_IMAGE) if OPENED_IMAGE is not None else print(
+                                  "No image opened."))
+        test_menu.add_command(label="Copy", command=lambda: copy(OPENED_IMAGE) if OPENED_IMAGE is not None else print(
+            "No image opened."))
+        test_menu.add_command(label="Greyscale",
+                              command=lambda: grayscale(OPENED_IMAGE) if OPENED_IMAGE is not None else print(
+                                  "No image opened."))
+        test_menu.add_command(label="Hsv", command=lambda: hsv(OPENED_IMAGE) if OPENED_IMAGE is not None else print(
+            "No image opened."))
+        test_menu.add_command(label="Hue Shifted",
+                              command=lambda: hue_shifted(OPENED_IMAGE, hue=50) if OPENED_IMAGE is not None else print(
+                                  "No image opened."))
+        test_menu.add_command(label="Smoothed",
+                              command=lambda: smoothing(OPENED_IMAGE) if OPENED_IMAGE is not None else print(
+                                  "No image opened."))
+        test_menu.add_command(label="Rotated", command=lambda: rotation(OPENED_IMAGE,
+                                                                        rotation_angle=90) if OPENED_IMAGE is not None else print(
+            "No image opened."))
+
+        clipboard_menu = tk.Menu(menu, tearoff=0)
+        menu.add_cascade(label="Clipboard", menu=clipboard_menu)
+
+        image_menu = tk.Menu(menu, tearoff=0)
+        menu.add_cascade(label="Image", menu=image_menu)
+
+        tools_menu = tk.Menu(menu, tearoff=0)
+        menu.add_cascade(label="Tools", menu=tools_menu)
+
+        shapes_menu = tk.Menu(menu, tearoff=0)
+        menu.add_cascade(label="Shapes", menu=shapes_menu)
+
+        colors_menu = tk.Menu(menu, tearoff=0)
+        menu.add_cascade(label="Colors", menu=colors_menu)
+
+        layer_menu = tk.Menu(menu, tearoff=0)
+        menu.add_cascade(label="Layer", menu=layer_menu)
+
+        filter_menu = tk.Menu(menu, tearoff=0)
+        menu.add_cascade(label="Filter", menu=filter_menu)
+        #
+
+        # Frame to hold image
+        imgframe = tk.Frame(root, width=500, height=500, bg="lightgray", relief="sunken", bd=2)
+        imgframe.pack(side="top", pady=10)
+
+        # Label to display image
+        image_label = tk.Label(imgframe, width=500, height=500, bg="white")
+        image_label.pack(expand=True)
+
+        root.mainloop()
+
+    def _openImage(self) -> None:
+        file_path = filedialog.askopenfilename(
+            filetypes=[("Image files", "*.jpg *.jpeg *.png *.gif *.bmp")]
+        )
+        if not file_path:
+            return
+
+        self._currentImage = ImageContainer()
+        self._currentImage.loadImage(file_path)