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1. EditableProperty.cs EditableProperty.cs

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   public sealed class EditableProperty<T> : EditablePropertyBase<T> where T : IComparable

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       {

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           protected override Dictionary<Func<bool>, T> ValidationRules { get; } = new Dictionary<Func<bool>, T>();

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           public EditableProperty() 

2. ObservableObject.cs ObservableObject.cs

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   using System.Collections.Generic;

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   using System.ComponentModel;

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   using System.Runtime.CompilerServices;

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   public abstract class ObservableObject : INotifyPropertyChanged

3. The benefit of using relay command i... The benefit of using relay command is that you can bind commands directly to the ViewModels.

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   using System;

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   using System.Windows.Input;

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   public class RelayCommand : ICommand

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   {

4. GetCurrentCursorPosition.cs GetCurrentCursorPosition.cs

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   [DllImport("user32.dll")]

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           [return: MarshalAs(UnmanagedType.Bool)]

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           static extern bool GetCursorPos(ref Win32Point pt);

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   [StructLayout(LayoutKind.Sequential)]