maui-linux/Xamarin.Forms.Platform.WPF/Controls/FormsWindowButtonCommands.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using Xamarin.Forms.Platform.WPF.Helpers;

namespace Xamarin.Forms.Platform.WPF.Controls
{
	[TemplatePart(Name = "PART_Min", Type = typeof(Button))]
	[TemplatePart(Name = "PART_Max", Type = typeof(Button))]
	[TemplatePart(Name = "PART_Close", Type = typeof(Button))]
	public class FormsWindowButtonCommands : ContentControl
	{
		private System.Windows.Controls.Button min;
		private System.Windows.Controls.Button max;
		private System.Windows.Controls.Button close;

		private FormsWindow _parentWindow;

		public FormsWindow ParentWindow
		{
			get { return _parentWindow; }
			set
			{
				_parentWindow = value;
			}
		}

		public FormsWindowButtonCommands()
		{
			this.DefaultStyleKey = typeof(FormsWindowButtonCommands);
		}

		public override void OnApplyTemplate()
		{
			base.OnApplyTemplate();

			close = Template.FindName("PART_Close", this) as System.Windows.Controls.Button;
			if (close != null)
			{
				close.Click += CloseClick;
			}

			max = Template.FindName("PART_Max", this) as System.Windows.Controls.Button;
			if (max != null)
			{
				max.Click += MaximizeClick;
			}

			min = Template.FindName("PART_Min", this) as System.Windows.Controls.Button;
			if (min != null)
			{
				min.Click += MinimizeClick;
			}
			this.ParentWindow = this.TryFindParent<FormsWindow>();
		}

		private void MinimizeClick(object sender, RoutedEventArgs e)
		{
			if (null == this.ParentWindow) return;
			Microsoft.Windows.Shell.SystemCommands.MinimizeWindow(this.ParentWindow);
		}

		private void MaximizeClick(object sender, RoutedEventArgs e)
		{
			if (null == this.ParentWindow) return;
			if (this.ParentWindow.WindowState == WindowState.Maximized)
			{
				Microsoft.Windows.Shell.SystemCommands.RestoreWindow(this.ParentWindow);
			}
			else
			{
				Microsoft.Windows.Shell.SystemCommands.MaximizeWindow(this.ParentWindow);
			}
		}

		private void CloseClick(object sender, RoutedEventArgs e)
		{
			if (null == this.ParentWindow) return;
			this.ParentWindow.Close();
		}
	}
}