Added Model-View-ViewModel framework support.

osrs-toolbox/MVVM/ModelBase.cs

@@ -0,0 +1,17 @@
+namespace osrs_toolbox
+{
+    public abstract class ModelBase : PropertyChangedBase
+    {
+        public void SetProperty<T>(ref T storage, T value, string name)
+        {
+            if (storage == null)
+                throw new InvalidCastException("osrs_toolbox.ModelBase.UpdateProperty\nStorage cannot be null.");
+            if (value == null)
+                throw new InvalidCastException("osrs_toolbox.ModelBase.UpdateProperty\nValue cannot be null.");
+            if (storage.GetType() != value.GetType())
+                throw new InvalidCastException("osrs_toolbox.ModelBase.UpdateProperty\nVariable type mismatch between storage and value.");
+            storage = value;
+            OnPropertyChanged(name);
+        }
+    }
+}

osrs-toolbox/MVVM/PropertyChangedBase.cs

@@ -0,0 +1,10 @@
+using System.ComponentModel;
+
+namespace osrs_toolbox
+{
+    public abstract class PropertyChangedBase : INotifyPropertyChanged
+    {
+        public event PropertyChangedEventHandler PropertyChanged;
+        public void OnPropertyChanged(string name) => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
+    }
+}

osrs-toolbox/MVVM/RelayCommand.cs

@@ -0,0 +1,33 @@
+using System.Windows.Input;
+
+namespace osrs_toolbox
+{
+    public class RelayCommand : ICommand
+    {
+        private Action<object> execute;
+        private Func<object, bool>? canExecute;
+
+
+        public event EventHandler? CanExecuteChanged
+        {
+            add { CommandManager.RequerySuggested += value; }
+            remove { CommandManager.RequerySuggested -= value; }
+        }
+
+        public RelayCommand(Action<object> execute, Func<object, bool>? canExecute = null)
+        {
+            this.execute = execute;
+            this.canExecute = canExecute;
+        }
+
+        public bool CanExecute(object? parameter)
+        {
+            return this.canExecute == null || this.canExecute(parameter);
+        }
+
+        public void Execute(object? parameter)
+        {
+            this.execute(parameter);
+        }
+    }
+}