WPF---Show-Hide-a-Control-using-MVVM/AppViewModel.cs at main · CSharpDesignPro/WPF---Show-Hide-a-Control-using-MVVM · GitHub

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/// <Summary>
/// Author : R. Arun Mutharasu
/// Created :17-01-2022
/// YouTube Channel : C# Design Pro
/// </Summary>

using System.ComponentModel;
using System.Windows.Input;

namespace WPFControlVisibilityApp.ViewModel
{
    public class AppViewModel : INotifyPropertyChanged
    {
        private bool _isPanelVisible;
        private ICommand _showPanelCommand;
        private ICommand _hidePanelCommand;

        public AppViewModel()
        {
            // Set Default Panel Visibility //
            IsPanelVisible = false;
        }

        // Panel Visibility Property //
        public bool IsPanelVisible
        {
            get
            {
                return _isPanelVisible;
            }
            set
            {
                _isPanelVisible = value;
                OnPropertyChanged("IsPanelVisible");
            }
        }

        // Show Panel Method //
        public void ShowPanel()
        {
            IsPanelVisible = true;
        }

        // Show Panel Command //
        public ICommand ShowPanelCommand
        {
            get
            {
                if (_showPanelCommand == null)
                {
                    _showPanelCommand = new RelayCommand.Command.RelayCommand(p => ShowPanel());
                }
                return _showPanelCommand;
            }
        }

        // Hide Panel Method //
        public void HidePanel()
        {
            IsPanelVisible = false;
        }

        // Hide Panel Command //
        public ICommand HidePanelCommand
        {
            get
            {
                if (_hidePanelCommand == null)
                {
                    _hidePanelCommand = new RelayCommand.Command.RelayCommand(p => HidePanel());
                }
                return _hidePanelCommand;
            }
        }

        // Close App Method //
        public void CloseApp(object obj)
        {
            MainWindow win = obj as MainWindow;
            win.Close();
        }

        // Close App Command //
        private ICommand _closeCommand;
        public ICommand CloseAppCommand
        {
            get
            {
                if (_closeCommand == null)
                {
                    _closeCommand = new RelayCommand.Command.RelayCommand(p => CloseApp(p));
                }
                return _closeCommand;
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;
        private void OnPropertyChanged(string propName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propName));
        }
    }
}