Common-VS2019/SacsMobileMaui/Maui/Panels/SamPanel_Page_Footer.cs

using Sarand.Net.Mobile.Maui.App;
using Sarand.Net.Mobile.Maui.Controls;
using Sarand.Net.Mobile.Maui.Layouts;
using Sarand.Net.Mobile.Maui.Utils;
using Sarand.Net.Mobile.Maui.Views;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Sarand.Net.Mobile.Maui.Panels
{
	//=======================================================================
	public class SamPanel_Page_Footer : SamPanel
	{
		//-------------------------------------------------------------------
		// Definitions.

		//-------------------------------------------------------------------
		// Data members.
		// Layout.
		private VerticalStackLayout panelFooter = new VerticalStackLayout() { BackgroundColor = Sam.Visuals.Page.Footer.BackgroundColor };
		private SamBoxView panelBorderTop = new SamBoxView() { BackgroundColor = Sam.Visuals.Page.Footer.BorderColor, HeightRequest = Sam.Visuals.Page.Footer.BorderStrokeWidthTop };
		private SamBoxView panelBorderBottom = new SamBoxView() { BackgroundColor = Sam.Visuals.Page.Footer.BorderColor, HeightRequest = Sam.Visuals.Page.Footer.BorderStrokeWidthBottom };
		// Grid.
		private SamGrid gridFooter = new SamGrid() { Padding = Sam.Visuals.Page.Footer.Padding };
		private ColumnDefinition colLeft = new ColumnDefinition(GridLength.Star);
		private ColumnDefinition colMiddle = new ColumnDefinition(GridLength.Auto);
		private ColumnDefinition colRight = new ColumnDefinition(GridLength.Star);
		// Panels.
		private VerticalStackLayout panelLeft = new VerticalStackLayout() { HorizontalOptions = LayoutOptions.Start };
		private VerticalStackLayout panelMiddle = new VerticalStackLayout() { HorizontalOptions = LayoutOptions.Center };
		private VerticalStackLayout panelRight = new VerticalStackLayout() { HorizontalOptions = LayoutOptions.End };
		// Date-time display.
		private String dateTimeFormat = "ddd d-MMM-yyyy HH:mm:ss";
		private IDispatcherTimer? timerDateTime;
		private Sam.DisplayPosition dateTimeDisplay = Sam.Visuals.Page.Footer.DateTimeDisplay;
		private SamLabel labelDateTime = new SamLabel() { FontSize = 12.0, HorizontalTextAlignment = TextAlignment.Center };

		//-------------------------------------------------------------------
		// Construction.
		public SamPanel_Page_Footer()
		{
			// Footer panel.
			Content = panelFooter;

			// Footer border top.
			panelFooter.Children.Add(panelBorderTop);

			// Footer grid.
			gridFooter.ColumnDefinitions.Add(colLeft);
			gridFooter.ColumnDefinitions.Add(colMiddle);
			gridFooter.ColumnDefinitions.Add(colRight);
			gridFooter.Add(panelLeft, 0, 0);
			gridFooter.Add(panelMiddle, 1, 0);
			gridFooter.Add(panelRight, 2, 0);
			panelFooter.Children.Add(gridFooter);

			// Footer border bottom.
			panelFooter.Children.Add(panelBorderBottom);

			RefreshComponents();
		}

		//-------------------------------------------------------------------
		// Properties.
		public Sam.DisplayPosition DateTimeDisplay
		{
			get { return dateTimeDisplay; }
			set { dateTimeDisplay = value; RefreshComponents(); }
		}
		public String DateTimeFormat
		{
			get { return dateTimeFormat; }
			set { dateTimeFormat = value; RefreshComponents(); }
		}

		//-------------------------------------------------------------------
		// Events.
		protected override void OnParentChanged()
		{
			base.OnParentChanged();
			if (Parent == null)
				ClearDateTimeTimer();
		}

		//-------------------------------------------------------------------
		// DateTime display.
		private void ClearDateTimeTimer()
		{
			if (timerDateTime != null && timerDateTime.IsRunning)
				timerDateTime.Stop();
		}

		private void TimerDateTime_Tick(object? sender, EventArgs e)
		{
			String dateTimeValue = DateTime.Now.ToString(dateTimeFormat);
			if (!labelDateTime.Text.Equals(dateTimeValue))
				labelDateTime.Text = dateTimeValue;
		}

		//-------------------------------------------------------------------
		private void RefreshComponents()
		{
			bool contentDisplayed = false;

			// Date time.
			ClearDateTimeTimer();
			panelLeft.Children.Remove(labelDateTime);
			panelMiddle.Children.Remove(labelDateTime);
			panelRight.Children.Remove(labelDateTime);
			if (dateTimeDisplay == Sam.DisplayPosition.Left)
				panelLeft.Children.Add(labelDateTime);
			else if (dateTimeDisplay == Sam.DisplayPosition.Middle)
				panelMiddle.Children.Add(labelDateTime);
			else if (dateTimeDisplay == Sam.DisplayPosition.Right)
				panelRight.Children.Add(labelDateTime);
			if (dateTimeDisplay != Sam.DisplayPosition.None)
			{
				contentDisplayed = true;
				timerDateTime = SamTimerUtil.DoTimer(this, TimeSpan.FromMilliseconds(250), true, TimerDateTime_Tick);
				timerDateTime.Start();
			}

			// Hide panel if nothing displayed.
			if (contentDisplayed)
				IsVisible = true;
			else IsVisible = false;
		}

		//-------------------------------------------------------------------
	}
	//=======================================================================
}