Common-VS2019/SacsMobileMaui/Maui/Controls/Panels/SamControlPanel.cs

using Sarand.Net.Mobile.Maui.App;
using Sarand.Net.Mobile.Maui.Views;
using Sarand.Net.Standard.Base.Utils;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;

namespace Sarand.Net.Mobile.Maui.Controls.Views
{
	public abstract class SamControlPanel : SamContentView
	{
		// --- Data Members ---

		// Components.
		private HorizontalStackLayout controlLayout = new HorizontalStackLayout();
		private SamContentView controlBorder = new SamContentView();
		private SamContentView controlPanel = new SamContentView() { Padding = Sam.Visuals.Form.Controls.Padding };
		// Styling.
		private Thickness controlBorderThickness = new Thickness(Sam.Visuals.Form.Controls.BorderWidth);
		private Color controlBorderColor = Sam.Visuals.Form.Controls.BorderColor;
		private Color controlBackgroundColor = Sam.Visuals.Form.Controls.BackgroundColor;

		// --- Construction ---

		protected SamControlPanel()
		{
			// Control layout: [Border[Panel]] [Suffix].
			controlBorder.Content = controlPanel;
			controlLayout.Add(controlBorder);
			controlLayout.Add(LabelSuffix);

			// --- Main layout ---
			Content = controlLayout;
		}

		// --- Properties ---


		// Label.
		public SamLabel Label { get; } = new SamLabel() { Margin = Sam.Visuals.Form.Label.Margin };
		public String LabelText { get { return Label.Text; } set { if (Label.Text.Equals(value)) return; Label.Text = value; } }

		// Control.
		/// <summary>The control itself. NB May be composite</summary>
		protected abstract View ControlView { get; }
		/// <summary>Control used for read-only display.</summary>
		protected SamLabel ReadOnlyLabel { get; } =
			new SamLabel() { BackgroundColor = Colors.Transparent };

		// Suffix.
		protected SamLabel LabelSuffix { get; } = new SamLabel() { Margin = Sam.Visuals.Form.Label.Margin };
		public String SuffixText { get { return LabelSuffix.Text; } set { if (LabelSuffix.Text.Equals(value)) return; LabelSuffix.Text = value; } }
		public double SuffixPadding { get { return LabelSuffix.Padding.Left; } set { if (LabelSuffix.Padding.Left == value) return; LabelSuffix.Padding = new(value, 0, 0, 0); } }

		// Styling.
		public new Color BackgroundColor
		{
			get { return controlBackgroundColor; }
			set { controlBackgroundColor = value; ConfigureComponents(); }
		}
		public Thickness BorderThickness
		{
			get { return controlBorderThickness; }
			set { controlBorderThickness = value; ConfigureComponents(); }
		}
		public double BorderWidth
		{
			set { BorderThickness = new Thickness(value); }
		}
		public Color BorderColor
		{
			get { return controlBorderColor; }
			set { controlBorderColor = value; }
		}
		public new LayoutOptions HorizontalOptions
		{
			get { return base.HorizontalOptions; }
			set { base.HorizontalOptions = value; ControlView.HorizontalOptions = value; }
		}
		protected String ReadOnlyText
		{
			get { return ReadOnlyLabel.Text; }
			set { if (ReadOnlyLabel.Text.Equals(value)) return; ReadOnlyLabel.Text = value; }
		}

		// --- Component configuration ---

		/// <summary>Control configuration that can be changed dynamically.</summary>
		public override void ConfigureComponents()
		{
			// Outer view acts as border.
			controlBorder.BackgroundColor = controlBorderColor;
			controlBorder.Padding = controlBorderThickness;
			controlPanel.BackgroundColor = controlBackgroundColor;
		}

		// --- Control activity ---

		public override void SetControlsReadOnly()
		{
			base.SetControlsReadOnly();
			if (ReadOnly) controlPanel.Content = ReadOnlyLabel;
			else controlPanel.Content = ControlView;
		}

		// --- Control events ---

		public new event EventHandler<FocusEventArgs>? Focused;
		protected void Control_Focused(object? sender, FocusEventArgs e)
		{
			if (Focused != null) Focused.Invoke(sender, e);
		}
		public new event EventHandler<FocusEventArgs>? Unfocused;
		protected void Control_Unfocused(object? sender, FocusEventArgs e)
		{
			if (Unfocused != null) Unfocused.Invoke(sender, e);
		}

		// --- View events ---

		protected override void OnPropertyChanged([CallerMemberName] string propertyName = "")
		{
			base.OnPropertyChanged(propertyName);
			//Logger.Debug(GetType().Name + ".OnPropertyChanged Name=" + propertyName);

			if (propertyName.EqualsCI(PaddingProperty.PropertyName))
			{
				if (!controlPanel.Padding.Equals(Padding))
				{
					// Apply the padding to the embedded view and clear this view's padding.
					controlPanel.Padding = Padding;
					Padding = new Thickness();
				}
			}
			else if (propertyName.EqualsCI(BackgroundColorProperty.PropertyName))
			{
				controlPanel.BackgroundColor = BackgroundColor;
			}
		}

		// --- The End ---
	}
}