gistfile1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace MyControlTest
{
    public enum ETextAlign
    {
        Left = 0,
        Center,
        Right
    }

    public enum ETextAlignV
    {
        Top = 0,
        Center,
        Bottom
    }

    public partial class UserControl1 : UserControl
    {
        private string _Caption = "DisplayName";
        private bool _EnableBackGradation = false;
        private Color _ToGradationColor = Color.Black;
        private ETextAlign _TA = ETextAlign.Center;
        private ETextAlignV _TAVertical = ETextAlignV.Top;
        private LinearGradientMode _GradationMode = LinearGradientMode.Vertical;
        private bool _InverseColorMode = false;
        public UserControl1()
        {
            InitializeComponent();

        }
        
        [Description("ここに指定した文字列が表示されます。")]
        public string Caption
        {
            get { return _Caption; }
            set { _Caption = value; Invalidate(); }
        }

        [Description("グラデーションを有効にするかを指定します。")]
        public bool EnableBackGradation
        {
            get { return _EnableBackGradation; }
            set { _EnableBackGradation = value; Invalidate(); }
        }

        
        [Description("グラデーション先の色を指定します。")]
        public Color ToGradationColor
        {
            get { return _ToGradationColor; }
            set { _ToGradationColor = value; Invalidate(); }
        }

        [Description("表示文字列の横位置を指定します。")]
        public ETextAlign TextAlign
        {
            get { return _TA; }
            set { _TA = value; Invalidate(); }
        }

        [Description("表示文字列の縦位置を指定します。")]
        public ETextAlignV TextAlignVertical
        {
            get { return _TAVertical; }
            set { _TAVertical = value; Invalidate(); }
        }


        [Description("グラデーションのモードを指定します。")]
        public LinearGradientMode GradationMode
        {
            get { return _GradationMode;}
            set { _GradationMode = value; Invalidate(); }
        }

        [Description("グラデーションの開始色(BackColorプロパティ)と終了色(ToGradationColorプロパティ)の関係を入れ替えます")]
        public bool InverseColorMode
        {
            get { return _InverseColorMode; }
            set { _InverseColorMode = value; Invalidate(); }
        }


        private void UserControl1_Paint(object sender, PaintEventArgs e)
        {


            Brush bgBrush;
            Graphics g = e.Graphics;

            Rectangle rect = new Rectangle();

            rect.Size = this.Size;
            
            //背景を描画
            if (_EnableBackGradation)
            {
                Color[] color = new Color[2];

                if (_InverseColorMode)
                {
                    color[1] = this.BackColor;
                    color[0] = ToGradationColor;
                }
                else
                {
                    color[0] = this.BackColor;
                    color[1] = ToGradationColor;
                }
                bgBrush = new LinearGradientBrush(rect, color[0], color[1], GradationMode);
            }
            else
            {
                bgBrush = new SolidBrush(this.BackColor);
            }
            g.FillRectangle(bgBrush, rect);


            //文字列を描画
            SolidBrush textBrush = new SolidBrush(this.ForeColor);
            Font font = this.Font;

            RectangleF textRect = new RectangleF();
            textRect.Size = g.MeasureString(_Caption, font); ;
            
            //横位置を設定

            switch (_TA)
            {
                case ETextAlign.Left:
                    textRect.X = 0;
                    break;
                case ETextAlign.Center:
                    textRect.X = (this.Size.Width - textRect.Size.Width) / 2;
                    break;
                case ETextAlign.Right:
                    textRect.X = this.Size.Width - textRect.Size.Width;
                    break;
            }

            switch (_TAVertical)
            {
                case ETextAlignV.Top:
                    textRect.Y = 0;
                    break;
                case ETextAlignV.Center:
                    textRect.Y = (this.Size.Height - textRect.Size.Height) / 2;
                    break;
                case ETextAlignV.Bottom:
                    textRect.Y = this.Size.Height - textRect.Size.Height;
                    break;
            }

            g.DrawString(_Caption, font, textBrush, textRect);
        }


        private void UserControl1_SizeChanged(object sender, EventArgs e)
        {
            Invalidate();
        }


    }
}