Terminal.Gui/UICatalog/Scenarios/MultiColouredTable.cs

using System;
using System.Data;
using System.Text;
using Terminal.Gui;

namespace UICatalog.Scenarios {

	[ScenarioMetadata (Name: "MultiColouredTable", Description: "Demonstrates how to multi color cell contents.")]
	[ScenarioCategory ("Controls")]
	[ScenarioCategory ("Colors")]
	[ScenarioCategory ("TableView")]
	public class MultiColouredTable : Scenario {
		TableViewColors tableView;
		private DataTable table;

		public override void Setup ()
		{
			Win.Title = this.GetName ();
			Win.Y = 1; // menu
			Win.Height = Dim.Fill (1); // status bar
			Application.Top.LayoutSubviews ();

			this.tableView = new TableViewColors () {
				X = 0,
				Y = 0,
				Width = Dim.Fill (),
				Height = Dim.Fill (1),
			};

			var menu = new MenuBar (new MenuBarItem [] {
				new MenuBarItem ("_File", new MenuItem [] {
					new MenuItem ("_Quit", "", () => Quit()),
				}),
			});
			Application.Top.Add (menu);

			var statusBar = new StatusBar (new StatusItem [] {
				new StatusItem(Application.QuitKey, $"{Application.QuitKey} to Quit", () => Quit()),
			});
			Application.Top.Add (statusBar);

			Win.Add (tableView);

			tableView.CellActivated += EditCurrentCell;

			var dt = new DataTable ();
			dt.Columns.Add ("Col1");
			dt.Columns.Add ("Col2");

			dt.Rows.Add ("some text", "Rainbows and Unicorns are so fun!");
			dt.Rows.Add ("some text", "When it rains you get rainbows");
			dt.Rows.Add (DBNull.Value, DBNull.Value);
			dt.Rows.Add (DBNull.Value, DBNull.Value);
			dt.Rows.Add (DBNull.Value, DBNull.Value);
			dt.Rows.Add (DBNull.Value, DBNull.Value);

			tableView.ColorScheme = new ColorScheme () {

				Disabled = Win.ColorScheme.Disabled,
				HotFocus = Win.ColorScheme.HotFocus,
				Focus = Win.ColorScheme.Focus,
				Normal = Application.Driver.MakeAttribute (Color.DarkGray, Color.Black)
			};

			tableView.Table = new DataTableSource (this.table = dt);
		}

		private void Quit ()
		{
			Application.RequestStop ();
		}
		private bool GetText (string title, string label, string initialText, out string enteredText)
		{
			bool okPressed = false;

			var ok = new Button ("Ok", is_default: true);
			ok.Clicked += (s, e) => { okPressed = true; Application.RequestStop (); };
			var cancel = new Button ("Cancel");
			cancel.Clicked += (s, e) => { Application.RequestStop (); };
			var d = new Dialog (ok, cancel) { Title = title };

			var lbl = new Label () {
				X = 0,
				Y = 1,
				Text = label
			};

			var tf = new TextField () {
				Text = initialText,
				X = 0,
				Y = 2,
				Width = Dim.Fill ()
			};

			d.Add (lbl, tf);
			tf.SetFocus ();

			Application.Run (d);

			enteredText = okPressed ? tf.Text.ToString () : null;
			return okPressed;
		}
		private void EditCurrentCell (object sender, CellActivatedEventArgs e)
		{
			if (e.Table == null)
				return;

			var oldValue = e.Table [e.Row, e.Col].ToString ();

			if (GetText ("Enter new value", e.Table.ColumnNames [e.Col], oldValue, out string newText)) {
				try {
					table.Rows [e.Row] [e.Col] = string.IsNullOrWhiteSpace (newText) ? DBNull.Value : (object)newText;
				} catch (Exception ex) {
					MessageBox.ErrorQuery (60, 20, "Failed to set text", ex.Message, "Ok");
				}

				tableView.Update ();
			}
		}

		class TableViewColors : TableView {
			protected override void RenderCell (Terminal.Gui.Attribute cellColor, string render, bool isPrimaryCell)
			{
				int unicorns = render.IndexOf ("unicorns", StringComparison.CurrentCultureIgnoreCase);
				int rainbows = render.IndexOf ("rainbows", StringComparison.CurrentCultureIgnoreCase);

				for (int i = 0; i < render.Length; i++) {

					if (unicorns != -1 && i >= unicorns && i <= unicorns + 8) {
						Driver.SetAttribute (Driver.MakeAttribute (Color.White, cellColor.Background));
					}

					if (rainbows != -1 && i >= rainbows && i <= rainbows + 8) {

						var letterOfWord = i - rainbows;
						switch (letterOfWord) {
						case 0:
							Driver.SetAttribute (Driver.MakeAttribute (Color.Red, cellColor.Background));
							break;
						case 1:
							Driver.SetAttribute (Driver.MakeAttribute (Color.BrightRed, cellColor.Background));
							break;
						case 2:
							Driver.SetAttribute (Driver.MakeAttribute (Color.BrightYellow, cellColor.Background));
							break;
						case 3:
							Driver.SetAttribute (Driver.MakeAttribute (Color.Green, cellColor.Background));
							break;
						case 4:
							Driver.SetAttribute (Driver.MakeAttribute (Color.BrightGreen, cellColor.Background));
							break;
						case 5:
							Driver.SetAttribute (Driver.MakeAttribute (Color.BrightBlue, cellColor.Background));
							break;
						case 6:
							Driver.SetAttribute (Driver.MakeAttribute (Color.BrightCyan, cellColor.Background));
							break;
						case 7:
							Driver.SetAttribute (Driver.MakeAttribute (Color.Cyan, cellColor.Background));
							break;
						}
					}

					Driver.AddRune ((Rune)render [i]);
					Driver.SetAttribute (cellColor);
				}
			}
		}
	}
}