all the changes requested by you are made!!!

ToDoAppTkInter/To_Do_AppTkInter.py

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+import tkinter as tk
+from tkinter import messagebox, ttk
+from tkcalendar import DateEntry
+import sqlite3
+
+class TodoApp:
+    def __init__(self, root):
+        self.root = root
+        self.root.title("Advanced To-Do List")
+        self.root.geometry("900x600")
+
+        # Initialize attributes
+        self.is_dark_theme = True  # Start with dark theme
+
+        # Create main frame and sidebar frame
+        self.main_frame = tk.Frame(self.root, bg="#2E2E2E")
+        self.main_frame.pack(side=tk.RIGHT, fill=tk.BOTH, expand=True)
+
+        self.sidebar_frame = tk.Frame(self.root, width=200, bg="#3A3A3A")
+        self.sidebar_frame.pack(side=tk.LEFT, fill=tk.Y)
+
+        self.create_widgets()
+        self.create_database()
+        self.apply_theme()  # Apply theme after frames are created
+        self.create_sidebar()
+        self.load_tasks()
+
+    def create_sidebar(self):
+        """Create the sidebar with navigation options."""
+        tk.Label(self.sidebar_frame, text="Menu", font=("Helvetica", 16), bg="#3A3A3A", fg="#FFFFFF").pack(pady=10)
+
+        # Create the "View All Tasks" button
+        self.view_all_button = tk.Button(
+            self.sidebar_frame, 
+            text="View All Tasks", 
+            command=self.load_tasks, 
+            bg="#5A5A5A", 
+            fg="#FFFFFF", 
+            relief="flat"
+        )
+        self.view_all_button.pack(pady=5, padx=10, fill=tk.X)
+
+        # Create other buttons like "View Completed Tasks", "View Pending Tasks", etc.
+        self.view_completed_button = tk.Button(
+            self.sidebar_frame, 
+            text="View Completed Tasks", 
+            command=self.load_completed_tasks, 
+            bg="#5A5A5A", 
+            fg="#FFFFFF", 
+            relief="flat"
+        )
+        self.view_completed_button.pack(pady=5, padx=10, fill=tk.X)
+
+        self.view_pending_button = tk.Button(
+            self.sidebar_frame, 
+            text="View Pending Tasks", 
+            command=self.load_pending_tasks, 
+            bg="#5A5A5A", 
+            fg="#FFFFFF", 
+            relief="flat"
+        )
+        self.view_pending_button.pack(pady=5, padx=10, fill=tk.X)
+
+        # Search entry and label
+        tk.Label(self.sidebar_frame, text="Search:", bg="#3A3A3A", fg="#FFFFFF").pack(pady=5)
+        self.search_entry = tk.Entry(self.sidebar_frame, bg="#4B4B4B", fg="#FFFFFF", relief="flat")
+        self.search_entry.pack(pady=5, padx=10, fill=tk.X)
+        self.search_entry.bind('<KeyRelease>', self.search_tasks)
+
+        # Toggle theme button
+        self.theme_button = tk.Button(
+            self.sidebar_frame, 
+            text="Toggle Theme", 
+            command=self.toggle_theme, 
+            bg="#5A5A5A", 
+            fg="#FFFFFF", 
+            relief="flat"
+        )
+        self.theme_button.pack(pady=5, padx=10, fill=tk.X)
+
+    def apply_theme(self):
+        """Apply the current theme to the application."""
+        if self.is_dark_theme:
+            bg_color = "#2E2E2E"
+            fg_color = "#FFFFFF"
+            button_bg = "#5A5A5A"
+            entry_bg = "#4B4B4B"
+        else:
+            bg_color = "#F0F0F0"
+            fg_color = "#000000"
+            button_bg = "#D0D0D0"
+            entry_bg = "#FFFFFF"
+
+        self.root.configure(bg=bg_color)
+        self.main_frame.configure(bg=bg_color)
+        self.sidebar_frame.configure(bg="#3A3A3A" if self.is_dark_theme else "#F0F0F0")
+
+        # Update the colors of sidebar elements
+        for widget in self.sidebar_frame.winfo_children():
+            if isinstance(widget, tk.Button):
+                widget.configure(bg=button_bg, fg=fg_color)
+            elif isinstance(widget, tk.Entry):
+                widget.configure(bg=entry_bg, fg=fg_color)
+
+    def toggle_theme(self):
+        """Toggle between light and dark themes."""
+        self.is_dark_theme = not self.is_dark_theme
+        self.apply_theme()
+
+    def create_database(self):
+        """Create the tasks table if it doesn't exist."""
+        self.conn = sqlite3.connect("tasks.db")
+        with self.conn:
+            self.conn.execute("""
+                CREATE TABLE IF NOT EXISTS tasks (
+                    id INTEGER PRIMARY KEY,
+                    task TEXT NOT NULL,
+                    category TEXT,
+                    due_date TEXT,
+                    priority TEXT,
+                    completed INTEGER DEFAULT 0
+                )
+            """)
+
+    def create_widgets(self):
+        """Create the main content area widgets."""
+        frame = tk.Frame(self.main_frame, bg="#2E2E2E" if self.is_dark_theme else "#FFFFFF", padx=10, pady=10)
+        frame.pack(pady=20, padx=20, fill=tk.BOTH, expand=True)
+
+        # Task entry
+        tk.Label(frame, text="Task:", font=("Helvetica", 12), bg=frame["bg"], fg="#FFFFFF" if self.is_dark_theme else "#000000").grid(row=0, column=0, sticky="w", pady=5)
+        self.task_entry = tk.Entry(frame, width=50, bg="#4B4B4B", fg="#FFFFFF", relief="flat")
+        self.task_entry.grid(row=0, column=1, sticky="ew", padx=5, pady=5)
+
+        # Category entry
+        tk.Label(frame, text="Category:", font=("Helvetica", 12), bg=frame["bg"], fg="#FFFFFF" if self.is_dark_theme else "#000000").grid(row=1, column=0, sticky="w", pady=5)
+        self.category_entry = tk.Entry(frame, width=50, bg="#4B4B4B", fg="#FFFFFF", relief="flat")
+        self.category_entry.grid(row=1, column=1, sticky="ew", padx=5, pady=5)
+
+        # Due date entry
+        tk.Label(frame, text="Due Date:", font=("Helvetica", 12), bg=frame["bg"], fg="#FFFFFF" if self.is_dark_theme else "#000000").grid(row=2, column=0, sticky="w", pady=5)
+        self.due_date_entry = DateEntry(frame, width=20, date_pattern='yyyy-mm-dd', background='#4B4B4B', foreground='white', relief="flat")
+        self.due_date_entry.grid(row=2, column=1, sticky="w", padx=5, pady=5)
+
+        # Priority menu
+        tk.Label(frame, text="Priority:", font=("Helvetica", 12), bg=frame["bg"], fg="#FFFFFF" if self.is_dark_theme else "#000000").grid(row=3, column=0, sticky="w", pady=5)
+        self.priority_var = tk.StringVar(value="Medium")
+        self.priority_menu = ttk.Combobox(frame, textvariable=self.priority_var, values=["High", "Medium", "Low"], state="readonly")
+        self.priority_menu.grid(row=3, column=1, sticky="w", padx=5, pady=5)
+
+        # Add task button
+        self.add_task_button = tk.Button(frame, text="Add Task", command=self.add_task, bg="#5A5A5A", fg="#FFFFFF", relief="flat")
+        self.add_task_button.grid(row=4, column=1, sticky="e", pady=10)
+
+        # Listbox for tasks
+        self.task_listbox = tk.Listbox(self.main_frame, font=("Helvetica", 10), bg="#2E2E2E", fg="#FFFFFF", height=15, relief="flat")
+        self.task_listbox.pack(pady=10, padx=20, fill=tk.BOTH, expand=True)
+
+    def load_tasks(self):
+        """Load all tasks from the database."""
+        self.task_listbox.delete(0, tk.END)
+        cursor = self.conn.cursor()
+        cursor.execute("SELECT * FROM tasks WHERE completed=0")
+        for row in cursor.fetchall():
+            self.task_listbox.insert(tk.END, f"{row[1]} | {row[2]} | Due: {row[3]} | Priority: {row[4]}")
+
+    def load_completed_tasks(self):
+        """Load completed tasks."""
+        self.task_listbox.delete(0, tk.END)
+        cursor = self.conn.cursor()
+        cursor.execute("SELECT * FROM tasks WHERE completed=1")
+        for row in cursor.fetchall():
+            self.task_listbox.insert(tk.END, f"{row[1]} | {row[2]} | Due: {row[3]} | Priority: {row[4]}")
+
+    def load_pending_tasks(self):
+        """Load pending tasks."""
+        self.load_tasks()
+
+    def add_task(self):
+        """Add a new task."""
+        task = self.task_entry.get()
+        category = self.category_entry.get()
+        due_date = self.due_date_entry.get()
+        priority = self.priority_var.get()
+
+        if task and category and due_date:
+            with self.conn:
+                self.conn.execute("INSERT INTO tasks (task, category, due_date, priority) VALUES (?, ?, ?, ?)", 
+                                  (task, category, due_date, priority))
+            self.load_tasks()
+            self.task_entry.delete(0, tk.END)
+            self.category_entry.delete(0, tk.END)
+        else:
+            messagebox.showwarning("Input Error", "Please fill all fields.")
+
+    def search_tasks(self, event):
+        """Search tasks based on input."""
+        query = self.search_entry.get().lower()
+        self.task_listbox.delete(0, tk.END)
+        cursor = self.conn.cursor()
+        cursor.execute("SELECT * FROM tasks WHERE completed=0")
+        for row in cursor.fetchall():
+            task_str = f"{row[1]} | {row[2]} | Due: {row[3]} | Priority: {row[4]}"
+            if query in task_str.lower():
+                self.task_listbox.insert(tk.END, task_str)
+
+if __name__ == "__main__":
+    root = tk.Tk()
+    app = TodoApp(root)
+    root.mainloop()