kev/Drawer/UCDraw/SigmaDrawerWellElement/GradientFillForm.cs

using System.Drawing;
using System.Windows.Forms;

namespace GeoSigma.SigmaDrawerElement
{
    /// <summary>
    /// 曲线渐变填充界面
    /// </summary>
    public partial class GradientFillForm : Form
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="GradientFillForm"/> class.
        /// </summary>
        public GradientFillForm()
        {
            InitializeComponent();

            LeftColorComboBox.DrawItem += LeftColorComboBox_DrawItem;
            RightColorComboBox.DrawItem += RightColorComboBox_DrawItem;
        }

        public string CurveName
        {
            get => CurveComoBox.Text;
            set => CurveComoBox.Text = value;
        }

        public WellTrackGradientStyle GradientStyle
        {
            set
            {
                CurveComoBox.Text = value.CurveName;
                LeftValueTextBox.Text = value.Left.ToString();
                RightValueTextBox.Text = value.Right.ToString();
            }
        }

        private void RightColorComboBox_DrawItem(object sender, DrawItemEventArgs e)
        {
            throw new System.NotImplementedException();
        }

        private void LeftColorComboBox_DrawItem(object sender, DrawItemEventArgs e)
        {
            throw new System.NotImplementedException();
        }

        private void DrawItem(object sender, DrawItemEventArgs e)
        {
            e.DrawBackground();

            var comboBox = sender as ComboBox;

            if (e.Index >= 0)
            {
                object item = comboBox.Items[e.Index];
                if (item is Color color)
                {
                    // 画颜色块
                    using (Brush brush = new SolidBrush(color))
                    {
                        e.Graphics.FillRectangle(brush, e.Bounds.Left + 2, e.Bounds.Top + 2, 20, e.Bounds.Height - 4);
                        e.Graphics.DrawRectangle(Pens.Black, e.Bounds.Left + 2, e.Bounds.Top + 2, 20, e.Bounds.Height - 4);
                    }

                    // 画颜色名字
                    e.Graphics.DrawString(color.Name, e.Font, Brushes.Black, e.Bounds.Left + 25, e.Bounds.Top + 2);
                }
            }

            e.DrawFocusRectangle();
        }
    }
}