agrobot_base/AgroBase/AgroBase/Forms/IHM/Controls/HmiCompactNumericField.cs

using AgroBase.Forms.IHM.Controls;
using System;
using System.ComponentModel;
using System.Drawing;
using System.Globalization;
using System.Windows.Forms;

namespace AgroBase.Forms.IHM.Operacao.Parametros.Controls
{
    [DefaultEvent("ValueChanged")]
    public class HmiCompactNumericField : UserControl
    {
        private readonly TableLayoutPanel _root;
        private readonly Label _lblTitulo;
        private readonly TableLayoutPanel _valueLayout;
        private readonly Button _btnDiminuir;
        private readonly TextBox _txtValor;
        private readonly Button _btnAumentar;
        private readonly Label _lblUnidade;

        private decimal _value;
        private decimal _minimum;
        private decimal _maximum = 100M;
        private decimal _increment = 1M;
        private int _decimalPlaces;

        public event EventHandler ValueChanged;

        public HmiCompactNumericField()
        {
            SetStyle(
                ControlStyles.AllPaintingInWmPaint |
                ControlStyles.OptimizedDoubleBuffer |
                ControlStyles.ResizeRedraw |
                ControlStyles.UserPaint,
                true);

            DoubleBuffered = true;
            BackColor = HmiTheme.SurfaceRaised;
            Margin = new Padding(3);
            Padding = new Padding(7, 5, 7, 5);
            MinimumSize = new Size(105, 62);

            _root = new TableLayoutPanel
            {
                Dock = DockStyle.Fill,
                BackColor = Color.Transparent,
                ColumnCount = 1,
                RowCount = 2,
                Margin = Padding.Empty,
                Padding = Padding.Empty
            };

            _root.ColumnStyles.Add(
                new ColumnStyle(SizeType.Percent, 100F));

            _root.RowStyles.Add(
                new RowStyle(SizeType.Absolute, 22F));

            _root.RowStyles.Add(
                new RowStyle(SizeType.Percent, 100F));

            _lblTitulo = new Label
            {
                Dock = DockStyle.Fill,
                AutoSize = false,
                AutoEllipsis = true,
                BackColor = Color.Transparent,
                ForeColor = HmiTheme.TextMuted,
                Font = new Font("Segoe UI", 6.8F, FontStyle.Bold),
                Text = "Parâmetro",
                TextAlign = ContentAlignment.MiddleLeft,
                Margin = Padding.Empty,
                Padding = Padding.Empty
            };

            _valueLayout = new TableLayoutPanel
            {
                Dock = DockStyle.Fill,
                BackColor = Color.Transparent,
                ColumnCount = 4,
                RowCount = 1,
                Margin = Padding.Empty,
                Padding = Padding.Empty
            };

            _valueLayout.ColumnStyles.Add(
                new ColumnStyle(SizeType.Absolute, 34F));

            _valueLayout.ColumnStyles.Add(
                new ColumnStyle(SizeType.Percent, 100F));

            _valueLayout.ColumnStyles.Add(
                new ColumnStyle(SizeType.Absolute, 34F));

            _valueLayout.ColumnStyles.Add(
                new ColumnStyle(SizeType.Absolute, 34F));

            _valueLayout.RowStyles.Add(
                new RowStyle(SizeType.Percent, 100F));

            _btnDiminuir = CriarBotaoValor("−");
            _btnAumentar = CriarBotaoValor("+");

            _txtValor = new TextBox
            {
                Dock = DockStyle.Fill,
                BackColor = HmiTheme.Surface,
                ForeColor = HmiTheme.Text,
                BorderStyle = BorderStyle.FixedSingle,
                Font = new Font("Segoe UI", 9F, FontStyle.Bold),
                TextAlign = HorizontalAlignment.Center,
                ReadOnly = true,
                ShortcutsEnabled = false,
                TabStop = false,
                Margin = new Padding(3, 1, 3, 1)
            };

            _lblUnidade = new Label
            {
                Dock = DockStyle.Fill,
                AutoSize = false,
                BackColor = Color.Transparent,
                ForeColor = HmiTheme.TextMuted,
                Font = new Font("Segoe UI", 7F, FontStyle.Bold),
                Text = "%",
                TextAlign = ContentAlignment.MiddleCenter,
                Margin = Padding.Empty,
                Padding = Padding.Empty
            };

            _valueLayout.Controls.Add(_btnDiminuir, 0, 0);
            _valueLayout.Controls.Add(_txtValor, 1, 0);
            _valueLayout.Controls.Add(_btnAumentar, 2, 0);
            _valueLayout.Controls.Add(_lblUnidade, 3, 0);

            _root.Controls.Add(_lblTitulo, 0, 0);
            _root.Controls.Add(_valueLayout, 0, 1);

            Controls.Add(_root);

            _btnDiminuir.Click += delegate
            {
                Value -= Increment;
            };

            _btnAumentar.Click += delegate
            {
                Value += Increment;
            };

            AtualizarTexto();
            AtualizarBotoes();
        }

        private static Button CriarBotaoValor(string texto)
        {
            Button button = new Button
            {
                Dock = DockStyle.Fill,
                BackColor = HmiTheme.Surface,
                ForeColor = HmiTheme.Info,
                FlatStyle = FlatStyle.Flat,
                Font = new Font("Segoe UI", 12F, FontStyle.Bold),
                Text = texto,
                TextAlign = ContentAlignment.MiddleCenter,
                Cursor = Cursors.Hand,
                Margin = new Padding(1),
                Padding = Padding.Empty,
                TabStop = false,
                UseVisualStyleBackColor = false
            };

            button.FlatAppearance.BorderSize = 1;
            button.FlatAppearance.BorderColor = HmiTheme.Border;
            button.FlatAppearance.MouseOverBackColor =
                Color.FromArgb(35, 52, 61);

            button.FlatAppearance.MouseDownBackColor =
                Color.FromArgb(42, 67, 78);

            return button;
        }

        private void DefinirValor(decimal value)
        {
            decimal novo = Math.Max(
                Minimum,
                Math.Min(Maximum, value));

            novo = decimal.Round(
                novo,
                DecimalPlaces,
                MidpointRounding.AwayFromZero);

            if (_value == novo)
            {
                AtualizarTexto();
                AtualizarBotoes();
                return;
            }

            _value = novo;

            AtualizarTexto();
            AtualizarBotoes();

            if (ValueChanged != null)
                ValueChanged(this, EventArgs.Empty);
        }

        private void AtualizarTexto()
        {
            string formato = DecimalPlaces > 0
                ? "F" + DecimalPlaces
                : "F0";

            _txtValor.Text = _value.ToString(
                formato,
                CultureInfo.CurrentCulture);
        }

        private void AtualizarBotoes()
        {
            bool podeDiminuir = _value > Minimum;
            bool podeAumentar = _value < Maximum;

            AplicarEstadoBotao(
                _btnDiminuir,
                podeDiminuir);

            AplicarEstadoBotao(
                _btnAumentar,
                podeAumentar);
        }

        private static void AplicarEstadoBotao(
            Button button,
            bool habilitado)
        {
            button.Enabled = habilitado;

            if (habilitado)
            {
                button.ForeColor = HmiTheme.Info;
                button.BackColor = HmiTheme.Surface;
                button.FlatAppearance.BorderColor =
                    HmiTheme.Border;
            }
            else
            {
                button.ForeColor = HmiTheme.TextMuted;
                button.BackColor = HmiTheme.SurfaceRaised;
                button.FlatAppearance.BorderColor =
                    HmiTheme.SurfaceRaised;
            }
        }

        [Category("Conteúdo")]
        public string Titulo
        {
            get { return _lblTitulo.Text; }
            set { _lblTitulo.Text = value ?? string.Empty; }
        }

        [Category("Conteúdo")]
        public string Unidade
        {
            get { return _lblUnidade.Text; }
            set
            {
                _lblUnidade.Text = value ?? string.Empty;
                AtualizarLarguraUnidade();
            }
        }

        private void AtualizarLarguraUnidade()
        {
            int largura;

            if (string.IsNullOrWhiteSpace(_lblUnidade.Text))
                largura = 4;
            else if (_lblUnidade.Text.Length <= 1)
                largura = 25;
            else
                largura = 35;

            _valueLayout.ColumnStyles[3].SizeType =
                SizeType.Absolute;

            _valueLayout.ColumnStyles[3].Width =
                largura;
        }

        [Category("Dados")]
        [DefaultValue(typeof(decimal), "0")]
        public decimal Value
        {
            get { return _value; }
            set { DefinirValor(value); }
        }

        [Category("Dados")]
        [DefaultValue(typeof(decimal), "0")]
        public decimal Minimum
        {
            get { return _minimum; }
            set
            {
                _minimum = value;

                if (_maximum < _minimum)
                    _maximum = _minimum;

                DefinirValor(_value);
            }
        }

        [Category("Dados")]
        [DefaultValue(typeof(decimal), "100")]
        public decimal Maximum
        {
            get { return _maximum; }
            set
            {
                _maximum = value;

                if (_maximum < _minimum)
                    _minimum = _maximum;

                DefinirValor(_value);
            }
        }

        [Category("Dados")]
        [DefaultValue(typeof(decimal), "1")]
        public decimal Increment
        {
            get { return _increment; }
            set
            {
                _increment = value > 0M
                    ? value
                    : 1M;
            }
        }

        [Category("Dados")]
        [DefaultValue(0)]
        public int DecimalPlaces
        {
            get { return _decimalPlaces; }
            set
            {
                _decimalPlaces = Math.Max(
                    0,
                    Math.Min(4, value));

                DefinirValor(_value);
            }
        }

        [Browsable(false)]
        public Button BotaoDiminuir
        {
            get { return _btnDiminuir; }
        }

        [Browsable(false)]
        public Button BotaoAumentar
        {
            get { return _btnAumentar; }
        }

        [Browsable(false)]
        public TextBox CampoValor
        {
            get { return _txtValor; }
        }
    }
}