gui-cs.Terminal.Gui/UICatalog/Scenarios/ColorPicker.cs

using System;
using Terminal.Gui;

namespace UICatalog.Scenarios;

[ScenarioMetadata ("Color Picker", "Color Picker.")]
[ScenarioCategory ("Colors")]
[ScenarioCategory ("Controls")]
public class ColorPickers : Scenario {

	/// <summary>
	/// Background color Label.
	/// </summary>
	Label _backgroundColorLabel;

	/// <summary>
	/// Demo label.
	/// </summary>
	View _demoView;

	/// <summary>
	/// Foreground color label.
	/// </summary>
	Label _foregroundColorLabel;

	/// <summary>
	/// Background ColorPicker.
	/// </summary>
	ColorPicker backgroundColorPicker;

	/// <summary>
	/// Foreground ColorPicker.
	/// </summary>
	ColorPicker foregroundColorPicker;

	/// <summary>
	/// Setup the scenario.
	/// </summary>
	public override void Setup ()
	{
		// Scenario Window's.
		Win.Title = GetName ();

		// Foreground ColorPicker.
		foregroundColorPicker = new ColorPicker {
			Title = "Foreground Color",
			BorderStyle = LineStyle.Single
		};
		foregroundColorPicker.ColorChanged += ForegroundColor_ColorChanged;
		Win.Add (foregroundColorPicker);

		_foregroundColorLabel = new Label {
			X = Pos.Left (foregroundColorPicker),
			Y = Pos.Bottom (foregroundColorPicker) + 1
		};
		Win.Add (_foregroundColorLabel);

		// Background ColorPicker.
		backgroundColorPicker = new ColorPicker {
			Title = "Background Color",
			Y = Pos.Center (),
			X = Pos.Center (),
			BoxHeight = 1,
			BoxWidth = 4,
			BorderStyle = LineStyle.Single
		};
		//backgroundColorPicker.X = Pos.AnchorEnd () - (Pos.Right (backgroundColorPicker) - Pos.Left (backgroundColorPicker));
		backgroundColorPicker.ColorChanged += BackgroundColor_ColorChanged;
		Win.Add (backgroundColorPicker);
		_backgroundColorLabel = new Label ();
		_backgroundColorLabel.X = Pos.AnchorEnd () - (Pos.Right (_backgroundColorLabel) - Pos.Left (_backgroundColorLabel));
		_backgroundColorLabel.Y = Pos.Bottom (backgroundColorPicker) + 1;
		Win.Add (_backgroundColorLabel);

		// Demo Label.
		_demoView = new View {
			Title = "Color Sample",
			Text = "Lorem Ipsum",
			TextAlignment = TextAlignment.Centered,
			VerticalTextAlignment = VerticalTextAlignment.Middle,
			BorderStyle = LineStyle.Heavy,
			X = Pos.Center (),
			Y = Pos.Center (),
			Height = 5,
			Width = 20
		};
		Win.Add (_demoView);

		// Set default colors.
		foregroundColorPicker.SelectedColor = _demoView.SuperView.ColorScheme.Normal.Foreground.ColorName;
		backgroundColorPicker.SelectedColor = _demoView.SuperView.ColorScheme.Normal.Background.ColorName;
		Win.Initialized += (s, e) => Win.LayoutSubviews ();
	}

	/// <summary>
	/// Fired when foreground color is changed.
	/// </summary>
	void ForegroundColor_ColorChanged (object sender, EventArgs e)
	{
		UpdateColorLabel (_foregroundColorLabel, foregroundColorPicker);
		UpdateDemoLabel ();
	}

	/// <summary>
	/// Fired when background color is changed.
	/// </summary>
	void BackgroundColor_ColorChanged (object sender, EventArgs e)
	{
		UpdateColorLabel (_backgroundColorLabel, backgroundColorPicker);
		UpdateDemoLabel ();
	}

	/// <summary>
	/// Update a color label from his ColorPicker.
	/// </summary>
	void UpdateColorLabel (Label label, ColorPicker colorPicker)
	{
		label.Clear ();
		var color = new Color (colorPicker.SelectedColor);
		label.Text = $"{colorPicker.SelectedColor} ({(int)colorPicker.SelectedColor}) #{color.R:X2}{color.G:X2}{color.B:X2}";
	}

	/// <summary>
	/// Update Demo Label.
	/// </summary>
	void UpdateDemoLabel () => _demoView.ColorScheme = new ColorScheme {
		Normal = new Attribute (foregroundColorPicker.SelectedColor, backgroundColorPicker.SelectedColor)
	};
}