C# ガントチャート試作

C# DataGridView セルの結合

前回の記事でDataGridViewの結合を色々試しており、その流れで当初、進捗をセルの塗りつぶしで表現する感じのスケジュール管理用のソフトを作ろうかと考えていた。

作業の途中でふとセルの塗りつぶしではなくコントロールのLabelを置いたらどうだろうと思いついて、少し作業を進めてみた。

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

using System.Diagnostics;

namespace ProductionManagement
{
    public partial class GanttChart : Form
    {
        private int _StartMainColumn;

        private int _HeaderHeight = 20;
        private int _DateColumnWidth = 16;
        private DateClass _DateClass = new DateClass();

        private Bitmap[] _BitmapArrayDay = new Bitmap[32];
        private Bitmap[] _BitmapArrayWeekday = new Bitmap[7];

        public GanttChart()
        {
            InitializeComponent();

            Binding();
            InitializeTextBox();
            CreateDataGridView();

            SetupDataGridView();
            AttachEvent();

            CreateBitmap();
        }

        private void p(string target) { Debug.Print(target); }

        private void AttachEvent()
        {
            CreateChart.Click += (s, e) => CreateDataGridView();
            CreateBar.Click += (s, e) => CreateLabeBar(s, e);

            DataGridView.CellPainting += (s, e) => SetupCellPainting(s, e);
            DataGridView.Scroll += (s, e) => AllBarLabelTransparent();
            DataGridView.SizeChanged += (s, e) => AllBarLabelTransparent();
            DataGridView.RowPrePaint += (s, e) => { e.PaintParts &= ~DataGridViewPaintParts.Focus; };
            DataGridView.SelectionChanged += (s, e) => DataGridViewHeaderLock();
        }

        private void CreateLabeBar(object s, EventArgs e)
        {
            var lb = new MyLabel()
            {
                Font = DataGridView.Font,
                Text = "テスト",
                TextAlign = ContentAlignment.MiddleLeft ,
                BackColor = Color.Bisque,
                Height = DataGridView.RowTemplate.Height - 1,
                Width = (_DateColumnWidth * 15) - 1,
                rowIndex = 4,
                columnIndex = _StartMainColumn
                // ID,追番,開始日は初期化時点では未設定
            };

            this.Controls.Add(lb);
            lb.BringToFront();

            lb.MouseDoubleClick += (s1, e1) => EditLabelTextOrDelete(s1, e1);
            lb.MouseDown += (s2, e2) => LabelMouseDown(s2, e2);
            lb.MouseUp += (s3, e3) => LabelMouseUp(s3, e3);
            lb.MouseMove += (s4, e4) => LabelMouseMove(s4, e4);

            ListMyLabel.Add(lb);

            // barLabelもtargetCellもLabelMouseMove()でアクティブなインスタンスが入る
            // 明示的に破棄はしていない

            barLabel = lb;
            targetCell = DataGridView.Rows[4].Cells[_StartMainColumn];
            DropBarLabel();
        }

        private int GetMaxDisplayColumnIndex()
        {
            for (int c = DataGridView.Columns.Count - 1; c >= 0; c--)
            {
                if (DataGridView.Rows[DataGridView.FirstDisplayedScrollingRowIndex].Cells[c].Displayed) return c - 1;
            }
            return DataGridView.Columns.Count - 1;
        }

        private void InitializeTextBox()
        {
            DateTime ym = DateTime.Now;
            if (ym.Day <= 20) ym = ym.AddMonths(-1);

            _DateClass.年月 = ym.ToString("yyyy年MM月");
            TargetYm.Text = ym.ToString("yyyy年MM月");
        }

        private void Binding()
        {
            TargetYm.DataBindings.Add("Text", _DateClass, "年月");
        }

        private void CreateBitmap()
        {
            for (int i = 1; i <= 31; i++)
            {
                var lb = new Label()
                {
                    Text = i.ToString().PadLeft(2, '0'),
                    Width = _DateColumnWidth * 3,
                    Height = _HeaderHeight,
                    Font = DataGridView.Font,
                    TextAlign = ContentAlignment.MiddleCenter,
                    BackColor = Color.AliceBlue
                };
                var bitmap = new Bitmap(lb.Width, lb.Height);
                lb.DrawToBitmap(bitmap, lb.Bounds);
                _BitmapArrayDay[i] = bitmap;
            }

            int j = 0;
            foreach (string w in new string[] { "月","火","水","木","金","土","日" })
            {
                var lb = new Label()
                {
                    Text = w,
                    Width = _DateColumnWidth * 3,
                    Height = _HeaderHeight,
                    Font = DataGridView.Font,
                    TextAlign = ContentAlignment.MiddleCenter,
                    BackColor = Color.AliceBlue
                };
                var bitmap = new Bitmap(lb.Width, lb.Height);
                lb.DrawToBitmap(bitmap, lb.Bounds);
                _BitmapArrayWeekday[j] = bitmap;
                j++;
            }
        }

        private void DrawBorder(object s, DataGridViewCellPaintingEventArgs e)
        {
            var refer = Convert.ToString(DataGridView.Rows[1].Cells[e.ColumnIndex].Value);

            if (refer != "")
            {
                e.AdvancedBorderStyle.Left = DataGridViewAdvancedCellBorderStyle.OutsetDouble;
                // DrawLine()ではrightが上手く表示できない。
                // DividerWidthではヘッダー部分まで描画されてしまう。
            }
        }

        private string WeekdayNumber(string target)
        {
            if (target.Contains("月")) return "0";
            if (target.Contains("火")) return "1";
            if (target.Contains("水")) return "2";
            if (target.Contains("木")) return "3";
            if (target.Contains("金")) return "4";
            if (target.Contains("土")) return "5";
            if (target.Contains("日")) return "6";
            return "";
        }

        private void DrawMergeImage(object s, DataGridViewCellPaintingEventArgs e, bool isWeekday = false)
        {
            // 画像上で切り取る位置(X,Y)とサイズを指定する。
            // ここでは生成済のWidth*3の画像があり、その画像上での位置とサイズを指定する。
            var src = new Rectangle(
                0,
                0,
                e.CellBounds.Width,
                e.CellBounds.Height
                );

            // フォーム上で描画する位置を指定する。
            var dst = new Rectangle(
                e.CellBounds.X,
                e.CellBounds.Y,
                e.CellBounds.Width,
                e.CellBounds.Height - 1
                );

            var refer = Convert.ToString(DataGridView.Rows[e.RowIndex].Cells[e.ColumnIndex].Value);
            var referMinus1 = Convert.ToString(DataGridView.Rows[e.RowIndex].Cells[e.ColumnIndex - 1].Value);
            var referMinus2 = Convert.ToString(DataGridView.Rows[e.RowIndex].Cells[e.ColumnIndex - 2].Value);

            if (isWeekday)
            {
                refer = WeekdayNumber(refer);
                referMinus1 = WeekdayNumber(referMinus1);
                referMinus2 = WeekdayNumber(referMinus2);
            }

            if (refer != "")
            {
                if (isWeekday)
                {
                    e.Graphics.DrawImage(_BitmapArrayWeekday[int.Parse(refer)], dst, src, GraphicsUnit.Pixel);
                }
                else
                {
                    e.Graphics.DrawImage(_BitmapArrayDay[int.Parse(refer)], dst, src, GraphicsUnit.Pixel);
                }

                e.Graphics.DrawLine(new Pen(DataGridView.GridColor), // left
                    e.CellBounds.X - 1,
                    e.CellBounds.Y,
                    e.CellBounds.X - 1,
                    e.CellBounds.Y + e.CellBounds.Height
                    // leftとrightの罫線が重複しているが、leftだけだとクリックしたときに罫線がなくなってしまう
                );

                e.Graphics.DrawLine(new Pen(DataGridView.GridColor), // top
                    e.CellBounds.X,
                    e.CellBounds.Y - 1,
                    e.CellBounds.X + e.CellBounds.Width,
                    e.CellBounds.Y - 1
                );

                e.Graphics.DrawLine(new Pen(DataGridView.GridColor), // bottom
                    e.CellBounds.X,
                    e.CellBounds.Y + e.CellBounds.Height - 1,
                    e.CellBounds.X + e.CellBounds.Width,
                    e.CellBounds.Y + e.CellBounds.Height - 1
                );

                e.Handled = true;
            }
            else if (referMinus1 != "")
            {
                src.X = e.CellBounds.Width;

                if (isWeekday)
                {
                    e.Graphics.DrawImage(_BitmapArrayWeekday[int.Parse(referMinus1)], dst, src, GraphicsUnit.Pixel);
                }
                else
                {
                    e.Graphics.DrawImage(_BitmapArrayDay[int.Parse(referMinus1)], dst, src, GraphicsUnit.Pixel);
                }

                e.Graphics.DrawLine(new Pen(DataGridView.GridColor), // top
                    e.CellBounds.X,
                    e.CellBounds.Y - 1,
                    e.CellBounds.X + e.CellBounds.Width,
                    e.CellBounds.Y - 1
                );

                e.Graphics.DrawLine(new Pen(DataGridView.GridColor), // bottom
                    e.CellBounds.X,
                    e.CellBounds.Y + e.CellBounds.Height - 1,
                    e.CellBounds.X + e.CellBounds.Width,
                    e.CellBounds.Y + e.CellBounds.Height - 1
                );

                e.Handled = true;
            }
            else if (referMinus2 != "")
            {
                src.X = e.CellBounds.Width + e.CellBounds.Width;

                if (isWeekday)
                {
                    e.Graphics.DrawImage(_BitmapArrayWeekday[int.Parse(referMinus2)], dst, src, GraphicsUnit.Pixel);
                }
                else
                {
                    e.Graphics.DrawImage(_BitmapArrayDay[int.Parse(referMinus2)], dst, src, GraphicsUnit.Pixel);
                }

                e.Graphics.DrawLine(new Pen(DataGridView.GridColor), // top
                    e.CellBounds.X,
                    e.CellBounds.Y - 1,
                    e.CellBounds.X + e.CellBounds.Width,
                    e.CellBounds.Y - 1
                );

                e.Graphics.DrawLine(new Pen(DataGridView.GridColor), // bottom
                    e.CellBounds.X,
                    e.CellBounds.Y + e.CellBounds.Height - 1,
                    e.CellBounds.X + e.CellBounds.Width,
                    e.CellBounds.Y + e.CellBounds.Height - 1
                );

                if (e.RowIndex == 1 || e.RowIndex == 2)
                {
                    e.Graphics.DrawLine(new Pen(DataGridView.GridColor), // right
                        e.CellBounds.X + e.CellBounds.Width - 1,
                        e.CellBounds.Y,
                        e.CellBounds.X + e.CellBounds.Width - 1,
                        e.CellBounds.Y + e.CellBounds.Height
                    );
                }
                e.Handled = true;
            }
        }

        private void SetupCellPainting(object s, DataGridViewCellPaintingEventArgs e)
        {
            if (e.RowIndex == 0)
            {
                if (e.ColumnIndex < _StartMainColumn)
                {
                    e.AdvancedBorderStyle.Bottom = DataGridViewAdvancedCellBorderStyle.None;
                }

                if (e.ColumnIndex >= _StartMainColumn)
                {
                    e.AdvancedBorderStyle.Left = DataGridViewAdvancedCellBorderStyle.None;
                    e.AdvancedBorderStyle.Right = DataGridViewAdvancedCellBorderStyle.None;

                    if (e.ColumnIndex < DataGridView.Columns.Count - 1 &&
                        Convert.ToString(DataGridView.Rows[0].Cells[e.ColumnIndex + 1].Value) != "")
                    {
                        e.AdvancedBorderStyle.Right = DataGridViewAdvancedCellBorderStyle.Single;
                    }
                    DrawMergeImage(s, e);
                }
            }

            if (e.RowIndex == 1)
            {
                if (e.ColumnIndex < _StartMainColumn)
                {
                    e.AdvancedBorderStyle.Bottom = DataGridViewAdvancedCellBorderStyle.None;
                }

                if (e.ColumnIndex >= _StartMainColumn)
                {
                    DrawMergeImage(s, e);
                }
            }

            if (e.RowIndex == 2)
            {
                if (e.ColumnIndex >= _StartMainColumn)
                {
                    DrawMergeImage(s, e, true);
                }
            }

            if (e.RowIndex > 3)
            {
                if (e.ColumnIndex >= _StartMainColumn)
                {
                    DrawBorder(s, e);
                }
            }
        }

        private void EditLabelTextOrDelete(object s, MouseEventArgs e)
        {
            var lb = (MyLabel)s;

            if ((ModifierKeys & Keys.Control) == Keys.Control)
            {
                var yesNo = MessageBox.Show("削除しますか？", "", MessageBoxButtons.YesNo);
                if (yesNo == DialogResult.Yes) lb.Dispose();
                return;
            }
            
            var txt = new TextBox()
            {
                Font = DataGridView.Font,
                Multiline = true,
                Left = lb.Left,
                Top = lb.Top,
                Width = lb.Width,
                Height = lb.Height,
                Text = lb.Text,
            };

            lb.Visible = false;
            Controls.Add(txt);
            txt.BringToFront();
            txt.Focus();

            txt.LostFocus += (s1, e1) =>
            {
                lb.Text = txt.Text;
                lb.Visible = true;
                txt.Dispose();
            };
        }

        private bool isBarDrag;
        private Point startPoint;

        private void LabelMouseDown(object s, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                isBarDrag = true;
                Cursor.Current = Cursors.Hand;
                startPoint.X = e.Location.X;
                startPoint.Y = e.Location.Y;
            }

            if (e.Button == MouseButtons.Right)
            {
                isBarDrag = true;
                Cursor.Current = Cursors.SizeWE;
                startPoint.X = e.Location.X;
                startPoint.Y = e.Location.Y;
            }
        }

        private void LabelMouseUp(object s, MouseEventArgs e)
        {
            isBarDrag = false;
            Cursor.Current = Cursors.Default;

            if (e.Button == MouseButtons.Left)
            {
                DropBarLabel();
            }

            if (e.Button == MouseButtons.Right)
            {
                var diff = barLabel.Width % _DateColumnWidth;

                if ( (_DateColumnWidth / 2) <= diff)
                {
                    barLabel.Width = barLabel.Width - diff + _DateColumnWidth - 1;
                }
                else
                {
                    barLabel.Width = barLabel.Width - diff - 1;
                }

                int x = barLabel.Location.X + barLabel.Width;
                int y = barLabel.Location.Y;

                // 座標系変換
                x = x - DataGridView.Left;
                y = y - DataGridView.Top;

                var hitInfo = DataGridView.HitTest(x, y);
                SetValueBarLabelEndSide(hitInfo);
            }
        }

        private void SetValueBarLabelEndSide(DataGridView.HitTestInfo hitInfo)
        {
            if (hitInfo.ColumnIndex == -1) return;

            // 追番
            barLabel.endDayOrderNumber = Convert.ToString(DataGridView.Rows[3].Cells[hitInfo.ColumnIndex].Value);
            // 終了日
            var tmp = hitInfo.ColumnIndex;
            if (barLabel.endDayOrderNumber == "3") tmp = hitInfo.ColumnIndex - 2;
            if (barLabel.endDayOrderNumber == "2") tmp = hitInfo.ColumnIndex - 1;
            barLabel.endDay = Convert.ToString(DataGridView.Columns[tmp].Name);

            //todo del
            barLabel.Text = barLabel.endDay +
            " / " + barLabel.endDayOrderNumber;
        }

        private void SetValueBarLabel(DataGridView.HitTestInfo hitInfo)
        {
            barLabel.rowIndex = hitInfo.RowIndex;
            barLabel.columnIndex = hitInfo.ColumnIndex;

            // ID
            barLabel.ID = Convert.ToString(DataGridView.Rows[hitInfo.RowIndex].Cells["ID"].Value);
            // 追番
            barLabel.startDayOrderNumber = Convert.ToString(DataGridView.Rows[3].Cells[hitInfo.ColumnIndex].Value);
            // 開始日
            var tmp = hitInfo.ColumnIndex;
            if (barLabel.startDayOrderNumber == "3") tmp = hitInfo.ColumnIndex - 2;
            if (barLabel.startDayOrderNumber == "2") tmp = hitInfo.ColumnIndex - 1;
            barLabel.startDay = Convert.ToString(DataGridView.Columns[tmp].Name);

            //todo del
            barLabel.Text = barLabel.ID +
                " / " + barLabel.startDay +
                " / " + barLabel.startDayOrderNumber;
        }

        List<MyLabel> ListMyLabel = new List<MyLabel>();
        MyLabel barLabel;
        DataGridViewCell targetCell;

        private void LabelMouseMove(object s, MouseEventArgs e)
        {
            if (!isBarDrag) return;

            barLabel = (MyLabel)s;
            var rightBarLabel = barLabel.Left + barLabel.Width; // BarLabel右端

            var rect = DataGridView.GetCellDisplayRectangle(GetMaxDisplayColumnIndex(),
                DataGridView.FirstDisplayedScrollingRowIndex, true);

            var rightDataGridView = DataGridView.Left + rect.X + rect.Width; // DataGridView右端

            if (e.Button == MouseButtons.Left)
            {
                if (rightBarLabel < rightDataGridView)
                {
                    var x = barLabel.Location.X + e.Location.X - startPoint.X;
                    var y = barLabel.Location.Y + e.Location.Y - startPoint.Y;

                    PointingCell(x, y); // Formの座標系
                    barLabel.Location = new Point(x, y);
                }
                else if (rightBarLabel >= rightDataGridView)
                {
                    var diff = rightBarLabel - rightDataGridView;
                    PointingCell(barLabel.Location.X - diff, barLabel.Location.Y);
                    barLabel.Location = new Point(barLabel.Location.X - diff, barLabel.Location.Y);

                    isBarDrag = false;
                    Cursor.Current = Cursors.Default;
                    DropBarLabel();
                }
            }

            if (e.Button == MouseButtons.Right)
            {
                if (barLabel.Width >= _DateColumnWidth - 1 && rightBarLabel < rightDataGridView)
                {
                    barLabel.Width += (e.Location.X - startPoint.X);
                    startPoint.X = e.Location.X;
                }
            }
        }

        private void PointingCell(int x, int y)
        {
            // 座標系の変換
            x = x - DataGridView.Left;
            y = y - DataGridView.Top;

            var hitInfo = DataGridView.HitTest(x, y + DataGridView.RowTemplate.Height / 2); // ここではDgvの座標系

            if (hitInfo.ColumnIndex >= _StartMainColumn && hitInfo.RowIndex >= 4)
            {
                if (targetCell != null && 
                    targetCell != DataGridView.Rows[hitInfo.RowIndex].Cells[hitInfo.ColumnIndex])
                {
                    targetCell.Style.BackColor = Color.White;
                }

                // アクティブなインスタンスを入れるのがLabelMouseMove()ではない理由は
                // BackColorを戻す処理があるため

                targetCell = DataGridView.Rows[hitInfo.RowIndex].Cells[hitInfo.ColumnIndex];
                targetCell.Style.BackColor = Color.GreenYellow;

                SetValueBarLabel(hitInfo);
            }
        }

        private void DropBarLabel()
        {
            if (targetCell == null) return;

            targetCell.Style.BackColor = Color.White;
            var rect = DataGridView.GetCellDisplayRectangle(targetCell.ColumnIndex, targetCell.RowIndex, true);

            // 座標系の変換
            int x = rect.X + DataGridView.Left;
            int y = rect.Y + DataGridView.Top;

            BarTransparent(barLabel, x, y);
            barLabel.Location = new Point(x, y);
        }

        private void BarTransparent(MyLabel bar, int x, int y)
        {
            var leftGap = x - DataGridView.Left;
            var rightGap = (DataGridView.Left + DataGridView.Width) - (x + bar.Width);
            var topGap = y - DataGridView.Top;
            var bottomGap = DataGridView.Bottom - (y + bar.Height);

            if (leftGap <= 5 || rightGap <= 5 || topGap <= 5 || bottomGap <= 5)
            {
                bar.Visible = false;
            }
            else if (leftGap > 5 && rightGap > 5 && topGap > 5 && bottomGap > 5)
            {
                bar.Visible = true;
            }
        }

        private void AllBarLabelTransparent()
        {
            foreach (MyLabel bar in ListMyLabel)
            {
                var rect = DataGridView.GetCellDisplayRectangle(bar.columnIndex, bar.rowIndex, true);

                // 座標系の変換
                int x = rect.X + DataGridView.Left; 
                int y = rect.Y + DataGridView.Top;

                BarTransparent(bar, x, y);
                bar.Location = new Point(x, y);
            }
        }

        private void DataGridViewHeaderLock()
        {
            if (DataGridView.Rows.Count >= 2)
            {
                DataGridView.Rows[0].Selected = false;
                DataGridView.Rows[1].Selected = false;
            }
        }

        private void CreateDataGridView()
        {
            if (TargetYm.Text == "") return;

            DataGridView.Rows.Clear();
            DataGridView.Columns.Clear();

            DateTime ym = DateTime.Parse(TargetYm.Text);
            DateTime startDay = new DateTime(ym.Year, ym.Month, 21);

            ym = ym.AddMonths(1);
            DateTime endDay = new DateTime(ym.Year, ym.Month, 20);

            List<DataGridViewColumn> listColumn = new List<DataGridViewColumn>();
            string[] mainColumn = new string[] { "ID", "型式", "工番", "数量", "追番" };

            foreach (var e in mainColumn)
            {
                listColumn.Add(new DataGridViewTextBoxColumn
                {
                    Name = e,
                    HeaderText = ""
                });
            }

            _StartMainColumn = mainColumn.Count();

            while (startDay <= endDay) // 列作成
            {
                for (int i = 1; i <= 3; i++)
                {
                    listColumn.Add(new DataGridViewTextBoxColumn
                    {
                        Name = startDay.ToString("yyyy/MM/dd"),
                        HeaderText = "",
                        Width = _DateColumnWidth
                    });
                }
                startDay = startDay.AddDays(1);
            }

            DataGridView.Columns.AddRange(listColumn.ToArray());

            // ヘッダー追加
            for (int i = 0; i < 4; i++)
            {
                DataGridView.Rows.Add("");
                DataGridView.Rows[i].Height = _HeaderHeight;
            }

            int k = 1;
            for (int c = 0; c < listColumn.Count; c++)
            {
                if (c < _StartMainColumn)
                {
                    DataGridView.Rows[1].Cells[c].Value = listColumn[c].Name; 
                }

                if (c >= _StartMainColumn)
                {
                    DataGridView.Rows[3].Cells[c].Value = k++.ToString(); // 1,2,3
                    if (k == 4) k = 1;

                    if (DataGridView.Rows[3].Cells[c].Value.ToString() == "1")
                    {
                        DateTime.TryParse(listColumn[c].Name, out DateTime result);

                        DataGridView.Rows[1].Cells[c].Value = result.ToString("dd"); // 日付
                        DataGridView.Rows[2].Cells[c].Value = result.ToString("dddd"); // 曜日

                        if (c == _StartMainColumn || result.ToString("dd") == "01")
                        {
                            DataGridView.Rows[0].Cells[c].Value = result.ToString("MM");
                        }
                    }
                }
            }
            SetupRowColumn();
            DataLoad();
        }

        private void DataLoad()
        {
            DataGridView.RowTemplate.Height = 100;
            //todo ダミー
            DataGridView.Rows.Add("");
            DataGridView.Rows.Add("");
            DataGridView.Rows.Add("");
            DataGridView.Rows.Add("");
            DataGridView.Rows.Add("");
            DataGridView.Rows.Add("");
            DataGridView.Rows.Add("");
            DataGridView.Rows.Add("");
            DataGridView.Rows.Add("");
            DataGridView.Rows.Add("");
            DataGridView.Rows.Add("");
            DataGridView.Rows.Add("");

            int id = 11;
            for (int i = 4; i < DataGridView.Rows.Count; i++)
            {
                DataGridView.Rows[i].Cells["ID"].Value = id++.ToString();
            }
        }

        private void SetupRowColumn()
        {
            //DataGridView.Columns["ID"].Visible = false;

            DataGridView.Rows[0].DefaultCellStyle.BackColor = Color.AliceBlue;
            DataGridView.Rows[1].DefaultCellStyle.BackColor = Color.AliceBlue;
            DataGridView.Rows[2].DefaultCellStyle.BackColor = Color.AliceBlue;
            DataGridView.Rows[3].DefaultCellStyle.BackColor = Color.AliceBlue;

            foreach (DataGridViewColumn c in DataGridView.Columns) c.SortMode = DataGridViewColumnSortMode.NotSortable;
        }

        private void SetupDataGridView()
        {
            DataGridView.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.DisableResizing;
            DataGridView.RowHeadersWidth = 4;

            DataGridView.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.DisableResizing;
            DataGridView.ColumnHeadersHeight = 4;
            DataGridView.AllowUserToResizeColumns = false;

            DataGridView.ColumnHeadersDefaultCellStyle.WrapMode = DataGridViewTriState.False;

            DataGridView.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.None;
            DataGridView.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.None;

            DataGridView.Font = new Font("メイリオ", 9);
            DataGridView.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;

            DataGridView.AllowUserToAddRows = false;
            DataGridView.MultiSelect = true;

            typeof(DataGridView).
            GetProperty("DoubleBuffered", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic).
            SetValue(DataGridView, true, null);
        }
    }

    class MyLabel : Label
    {
        // 保存
        public string ID;
        public string yearMonth;
        public string startDay;
        public string startDayOrderNumber;
        public string endDay;
        public string endDayOrderNumber;

        // スクロール
        public int rowIndex;
        public int columnIndex;
    }

    class DateClass
    {
        private string TargetYm;
        public object 年月
        {
            set
            {
                try
                {
                    var dt = DateTime.Parse(Convert.ToString(value));
                    TargetYm = dt.ToString("yyyy年MM月");
                }
                catch
                {
                    TargetYm = "";
                }
            }
            get { return TargetYm; }
        }
    }
}

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using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Drawing.Text;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using System.Diagnostics;

namespace ProductionManagement

{

public partial class GanttChart : Form

{

private int _StartMainColumn;

private int _HeaderHeight = 20;

private int _DateColumnWidth = 16;

private DateClass _DateClass = new DateClass();

private Bitmap[] _BitmapArrayDay = new Bitmap[32];

private Bitmap[] _BitmapArrayWeekday = new Bitmap[7];

public GanttChart()

{

InitializeComponent();

Binding();

InitializeTextBox();

CreateDataGridView();

SetupDataGridView();

AttachEvent();

CreateBitmap();

}

private void p(string target) { Debug.Print(target); }

private void AttachEvent()

{

CreateChart.Click += (s, e) => CreateDataGridView();

CreateBar.Click += (s, e) => CreateLabeBar(s, e);

DataGridView.CellPainting += (s, e) => SetupCellPainting(s, e);

DataGridView.Scroll += (s, e) => AllBarLabelTransparent();

DataGridView.SizeChanged += (s, e) => AllBarLabelTransparent();

DataGridView.RowPrePaint += (s, e) => { e.PaintParts &= ~DataGridViewPaintParts.Focus; };

DataGridView.SelectionChanged += (s, e) => DataGridViewHeaderLock();

}

private void CreateLabeBar(object s, EventArgs e)

{

var lb = new MyLabel()

{

Font = DataGridView.Font,

Text = "テスト",

TextAlign = ContentAlignment.MiddleLeft ,

BackColor = Color.Bisque,

Height = DataGridView.RowTemplate.Height - 1,

Width = (_DateColumnWidth * 15) - 1,

rowIndex = 4,

columnIndex = _StartMainColumn

// ID,追番,開始日は初期化時点では未設定

};

this.Controls.Add(lb);

lb.BringToFront();

lb.MouseDoubleClick += (s1, e1) => EditLabelTextOrDelete(s1, e1);

lb.MouseDown += (s2, e2) => LabelMouseDown(s2, e2);

lb.MouseUp += (s3, e3) => LabelMouseUp(s3, e3);

lb.MouseMove += (s4, e4) => LabelMouseMove(s4, e4);

ListMyLabel.Add(lb);

// barLabelもtargetCellもLabelMouseMove()でアクティブなインスタンスが入る

// 明示的に破棄はしていない

barLabel = lb;

targetCell = DataGridView.Rows[4].Cells[_StartMainColumn];

DropBarLabel();

}

private int GetMaxDisplayColumnIndex()

{

for (int c = DataGridView.Columns.Count - 1; c >= 0; c--)

{

if (DataGridView.Rows[DataGridView.FirstDisplayedScrollingRowIndex].Cells[c].Displayed) return c - 1;

}

return DataGridView.Columns.Count - 1;

}

private void InitializeTextBox()

{

DateTime ym = DateTime.Now;

if (ym.Day <= 20) ym = ym.AddMonths(-1);

_DateClass.年月 = ym.ToString("yyyy年MM月");

TargetYm.Text = ym.ToString("yyyy年MM月");

}

private void Binding()

{

TargetYm.DataBindings.Add("Text", _DateClass, "年月");

}

private void CreateBitmap()

{

for (int i = 1; i <= 31; i++)

{

var lb = new Label()

{

Text = i.ToString().PadLeft(2, '0'),

Width = _DateColumnWidth * 3,

Height = _HeaderHeight,

Font = DataGridView.Font,

TextAlign = ContentAlignment.MiddleCenter,

BackColor = Color.AliceBlue

};

var bitmap = new Bitmap(lb.Width, lb.Height);

lb.DrawToBitmap(bitmap, lb.Bounds);

_BitmapArrayDay[i] = bitmap;

}

int j = 0;

foreach (string w in new string[] { "月","火","水","木","金","土","日" })

{

var lb = new Label()

{

Text = w,

Width = _DateColumnWidth * 3,

Height = _HeaderHeight,

Font = DataGridView.Font,

TextAlign = ContentAlignment.MiddleCenter,

BackColor = Color.AliceBlue

};

var bitmap = new Bitmap(lb.Width, lb.Height);

lb.DrawToBitmap(bitmap, lb.Bounds);

_BitmapArrayWeekday[j] = bitmap;

j++;

}

private void DrawBorder(object s, DataGridViewCellPaintingEventArgs e)

{

var refer = Convert.ToString(DataGridView.Rows[1].Cells[e.ColumnIndex].Value);

if (refer != "")

{

e.AdvancedBorderStyle.Left = DataGridViewAdvancedCellBorderStyle.OutsetDouble;

// DrawLine()ではrightが上手く表示できない。

// DividerWidthではヘッダー部分まで描画されてしまう。

}

private string WeekdayNumber(string target)

{

if (target.Contains("月")) return "0";

if (target.Contains("火")) return "1";

if (target.Contains("水")) return "2";

if (target.Contains("木")) return "3";

if (target.Contains("金")) return "4";

if (target.Contains("土")) return "5";

if (target.Contains("日")) return "6";

return "";

}

private void DrawMergeImage(object s, DataGridViewCellPaintingEventArgs e, bool isWeekday = false)

{

// 画像上で切り取る位置(X,Y)とサイズを指定する。

// ここでは生成済のWidth*3の画像があり、その画像上での位置とサイズを指定する。

var src = new Rectangle(

e.CellBounds.Width,

e.CellBounds.Height

);

// フォーム上で描画する位置を指定する。

var dst = new Rectangle(

e.CellBounds.X,

e.CellBounds.Y,

e.CellBounds.Width,

e.CellBounds.Height - 1

);

var refer = Convert.ToString(DataGridView.Rows[e.RowIndex].Cells[e.ColumnIndex].Value);

var referMinus1 = Convert.ToString(DataGridView.Rows[e.RowIndex].Cells[e.ColumnIndex - 1].Value);

var referMinus2 = Convert.ToString(DataGridView.Rows[e.RowIndex].Cells[e.ColumnIndex - 2].Value);

if (isWeekday)

{

refer = WeekdayNumber(refer);

referMinus1 = WeekdayNumber(referMinus1);

referMinus2 = WeekdayNumber(referMinus2);

}

if (refer != "")

{

if (isWeekday)

{

e.Graphics.DrawImage(_BitmapArrayWeekday[int.Parse(refer)], dst, src, GraphicsUnit.Pixel);

}

else

{

e.Graphics.DrawImage(_BitmapArrayDay[int.Parse(refer)], dst, src, GraphicsUnit.Pixel);

}

e.Graphics.DrawLine(new Pen(DataGridView.GridColor), // left

e.CellBounds.X - 1,

e.CellBounds.Y,

e.CellBounds.X - 1,

e.CellBounds.Y + e.CellBounds.Height

// leftとrightの罫線が重複しているが、leftだけだとクリックしたときに罫線がなくなってしまう

);

e.Graphics.DrawLine(new Pen(DataGridView.GridColor), // top

e.CellBounds.X,

e.CellBounds.Y - 1,

e.CellBounds.X + e.CellBounds.Width,

e.CellBounds.Y - 1

);

e.Graphics.DrawLine(new Pen(DataGridView.GridColor), // bottom

e.CellBounds.X,

e.CellBounds.Y + e.CellBounds.Height - 1,

e.CellBounds.X + e.CellBounds.Width,

e.CellBounds.Y + e.CellBounds.Height - 1

);

e.Handled = true;

}

else if (referMinus1 != "")

{

src.X = e.CellBounds.Width;

if (isWeekday)

{

e.Graphics.DrawImage(_BitmapArrayWeekday[int.Parse(referMinus1)], dst, src, GraphicsUnit.Pixel);

}

else

{

e.Graphics.DrawImage(_BitmapArrayDay[int.Parse(referMinus1)], dst, src, GraphicsUnit.Pixel);

}

e.Graphics.DrawLine(new Pen(DataGridView.GridColor), // top

e.CellBounds.X,

e.CellBounds.Y - 1,

e.CellBounds.X + e.CellBounds.Width,

e.CellBounds.Y - 1

);

e.Graphics.DrawLine(new Pen(DataGridView.GridColor), // bottom

e.CellBounds.X,

e.CellBounds.Y + e.CellBounds.Height - 1,

e.CellBounds.X + e.CellBounds.Width,

e.CellBounds.Y + e.CellBounds.Height - 1

);

e.Handled = true;

}

else if (referMinus2 != "")

{

src.X = e.CellBounds.Width + e.CellBounds.Width;

if (isWeekday)

{

e.Graphics.DrawImage(_BitmapArrayWeekday[int.Parse(referMinus2)], dst, src, GraphicsUnit.Pixel);

}

else

{

e.Graphics.DrawImage(_BitmapArrayDay[int.Parse(referMinus2)], dst, src, GraphicsUnit.Pixel);

}

e.Graphics.DrawLine(new Pen(DataGridView.GridColor), // top

e.CellBounds.X,

e.CellBounds.Y - 1,

e.CellBounds.X + e.CellBounds.Width,

e.CellBounds.Y - 1

);

e.Graphics.DrawLine(new Pen(DataGridView.GridColor), // bottom

e.CellBounds.X,

e.CellBounds.Y + e.CellBounds.Height - 1,

e.CellBounds.X + e.CellBounds.Width,

e.CellBounds.Y + e.CellBounds.Height - 1

);

if (e.RowIndex == 1 || e.RowIndex == 2)

{

e.Graphics.DrawLine(new Pen(DataGridView.GridColor), // right

e.CellBounds.X + e.CellBounds.Width - 1,

e.CellBounds.Y,

e.CellBounds.X + e.CellBounds.Width - 1,

e.CellBounds.Y + e.CellBounds.Height

);

}

e.Handled = true;

}

private void SetupCellPainting(object s, DataGridViewCellPaintingEventArgs e)

{

if (e.RowIndex == 0)

{

if (e.ColumnIndex < _StartMainColumn)

{

e.AdvancedBorderStyle.Bottom = DataGridViewAdvancedCellBorderStyle.None;

}

if (e.ColumnIndex >= _StartMainColumn)

{

e.AdvancedBorderStyle.Left = DataGridViewAdvancedCellBorderStyle.None;

e.AdvancedBorderStyle.Right = DataGridViewAdvancedCellBorderStyle.None;

if (e.ColumnIndex < DataGridView.Columns.Count - 1 &&

Convert.ToString(DataGridView.Rows[0].Cells[e.ColumnIndex + 1].Value) != "")

{

e.AdvancedBorderStyle.Right = DataGridViewAdvancedCellBorderStyle.Single;

}

DrawMergeImage(s, e);

}

if (e.RowIndex == 1)

{

if (e.ColumnIndex < _StartMainColumn)

{

e.AdvancedBorderStyle.Bottom = DataGridViewAdvancedCellBorderStyle.None;

}

if (e.ColumnIndex >= _StartMainColumn)

{

DrawMergeImage(s, e);

}

if (e.RowIndex == 2)

{

if (e.ColumnIndex >= _StartMainColumn)

{

DrawMergeImage(s, e, true);

}

if (e.RowIndex > 3)

{

if (e.ColumnIndex >= _StartMainColumn)

{

DrawBorder(s, e);

}

private void EditLabelTextOrDelete(object s, MouseEventArgs e)

{

var lb = (MyLabel)s;

if ((ModifierKeys & Keys.Control) == Keys.Control)

{

var yesNo = MessageBox.Show("削除しますか？", "", MessageBoxButtons.YesNo);

if (yesNo == DialogResult.Yes) lb.Dispose();

return;

}

var txt = new TextBox()

{

Font = DataGridView.Font,

Multiline = true,

Left = lb.Left,

Top = lb.Top,

Width = lb.Width,

Height = lb.Height,

Text = lb.Text,

};

lb.Visible = false;

Controls.Add(txt);

txt.BringToFront();

txt.Focus();

txt.LostFocus += (s1, e1) =>

{

lb.Text = txt.Text;

lb.Visible = true;

txt.Dispose();

};

}

private bool isBarDrag;

private Point startPoint;

private void LabelMouseDown(object s, MouseEventArgs e)

{

if (e.Button == MouseButtons.Left)

{

isBarDrag = true;

Cursor.Current = Cursors.Hand;

startPoint.X = e.Location.X;

startPoint.Y = e.Location.Y;

}

if (e.Button == MouseButtons.Right)

{

isBarDrag = true;

Cursor.Current = Cursors.SizeWE;

startPoint.X = e.Location.X;

startPoint.Y = e.Location.Y;

}

private void LabelMouseUp(object s, MouseEventArgs e)

{

isBarDrag = false;

Cursor.Current = Cursors.Default;

if (e.Button == MouseButtons.Left)

{

DropBarLabel();

}

if (e.Button == MouseButtons.Right)

{

var diff = barLabel.Width % _DateColumnWidth;

if ( (_DateColumnWidth / 2) <= diff)

{

barLabel.Width = barLabel.Width - diff + _DateColumnWidth - 1;

}

else

{

barLabel.Width = barLabel.Width - diff - 1;

}

int x = barLabel.Location.X + barLabel.Width;

int y = barLabel.Location.Y;

// 座標系変換

x = x - DataGridView.Left;

y = y - DataGridView.Top;

var hitInfo = DataGridView.HitTest(x, y);

SetValueBarLabelEndSide(hitInfo);

}

private void SetValueBarLabelEndSide(DataGridView.HitTestInfo hitInfo)

{

if (hitInfo.ColumnIndex == -1) return;

// 追番

barLabel.endDayOrderNumber = Convert.ToString(DataGridView.Rows[3].Cells[hitInfo.ColumnIndex].Value);

// 終了日

var tmp = hitInfo.ColumnIndex;

if (barLabel.endDayOrderNumber == "3") tmp = hitInfo.ColumnIndex - 2;

if (barLabel.endDayOrderNumber == "2") tmp = hitInfo.ColumnIndex - 1;

barLabel.endDay = Convert.ToString(DataGridView.Columns[tmp].Name);

//todo del

barLabel.Text = barLabel.endDay +

" / " + barLabel.endDayOrderNumber;

}

private void SetValueBarLabel(DataGridView.HitTestInfo hitInfo)

{

barLabel.rowIndex = hitInfo.RowIndex;

barLabel.columnIndex = hitInfo.ColumnIndex;

// ID

barLabel.ID = Convert.ToString(DataGridView.Rows[hitInfo.RowIndex].Cells["ID"].Value);

// 追番

barLabel.startDayOrderNumber = Convert.ToString(DataGridView.Rows[3].Cells[hitInfo.ColumnIndex].Value);

// 開始日

var tmp = hitInfo.ColumnIndex;

if (barLabel.startDayOrderNumber == "3") tmp = hitInfo.ColumnIndex - 2;

if (barLabel.startDayOrderNumber == "2") tmp = hitInfo.ColumnIndex - 1;

barLabel.startDay = Convert.ToString(DataGridView.Columns[tmp].Name);

//todo del

barLabel.Text = barLabel.ID +

" / " + barLabel.startDay +

" / " + barLabel.startDayOrderNumber;

}

List<MyLabel> ListMyLabel = new List<MyLabel>();

MyLabel barLabel;

DataGridViewCell targetCell;

private void LabelMouseMove(object s, MouseEventArgs e)

{

if (!isBarDrag) return;

barLabel = (MyLabel)s;

var rightBarLabel = barLabel.Left + barLabel.Width; // BarLabel右端

var rect = DataGridView.GetCellDisplayRectangle(GetMaxDisplayColumnIndex(),

DataGridView.FirstDisplayedScrollingRowIndex, true);

var rightDataGridView = DataGridView.Left + rect.X + rect.Width; // DataGridView右端

if (e.Button == MouseButtons.Left)

{

if (rightBarLabel < rightDataGridView)

{

var x = barLabel.Location.X + e.Location.X - startPoint.X;

var y = barLabel.Location.Y + e.Location.Y - startPoint.Y;

PointingCell(x, y); // Formの座標系

barLabel.Location = new Point(x, y);

}

else if (rightBarLabel >= rightDataGridView)

{

var diff = rightBarLabel - rightDataGridView;

PointingCell(barLabel.Location.X - diff, barLabel.Location.Y);

barLabel.Location = new Point(barLabel.Location.X - diff, barLabel.Location.Y);

isBarDrag = false;

Cursor.Current = Cursors.Default;

DropBarLabel();

}

if (e.Button == MouseButtons.Right)

{

if (barLabel.Width >= _DateColumnWidth - 1 && rightBarLabel < rightDataGridView)

{

barLabel.Width += (e.Location.X - startPoint.X);

startPoint.X = e.Location.X;

}

private void PointingCell(int x, int y)

{

// 座標系の変換

x = x - DataGridView.Left;

y = y - DataGridView.Top;

var hitInfo = DataGridView.HitTest(x, y + DataGridView.RowTemplate.Height / 2); // ここではDgvの座標系

if (hitInfo.ColumnIndex >= _StartMainColumn && hitInfo.RowIndex >= 4)

{

if (targetCell != null &&

targetCell != DataGridView.Rows[hitInfo.RowIndex].Cells[hitInfo.ColumnIndex])

{

targetCell.Style.BackColor = Color.White;

}

// アクティブなインスタンスを入れるのがLabelMouseMove()ではない理由は

// BackColorを戻す処理があるため

targetCell = DataGridView.Rows[hitInfo.RowIndex].Cells[hitInfo.ColumnIndex];

targetCell.Style.BackColor = Color.GreenYellow;

SetValueBarLabel(hitInfo);

}

private void DropBarLabel()

{

if (targetCell == null) return;

targetCell.Style.BackColor = Color.White;

var rect = DataGridView.GetCellDisplayRectangle(targetCell.ColumnIndex, targetCell.RowIndex, true);

// 座標系の変換

int x = rect.X + DataGridView.Left;

int y = rect.Y + DataGridView.Top;

BarTransparent(barLabel, x, y);

barLabel.Location = new Point(x, y);

}

private void BarTransparent(MyLabel bar, int x, int y)

{

var leftGap = x - DataGridView.Left;

var rightGap = (DataGridView.Left + DataGridView.Width) - (x + bar.Width);

var topGap = y - DataGridView.Top;

var bottomGap = DataGridView.Bottom - (y + bar.Height);

if (leftGap <= 5 || rightGap <= 5 || topGap <= 5 || bottomGap <= 5)

{

bar.Visible = false;

}

else if (leftGap > 5 && rightGap > 5 && topGap > 5 && bottomGap > 5)

{

bar.Visible = true;

}

private void AllBarLabelTransparent()

{

foreach (MyLabel bar in ListMyLabel)

{

var rect = DataGridView.GetCellDisplayRectangle(bar.columnIndex, bar.rowIndex, true);

// 座標系の変換

int x = rect.X + DataGridView.Left;

int y = rect.Y + DataGridView.Top;

BarTransparent(bar, x, y);

bar.Location = new Point(x, y);

}

private void DataGridViewHeaderLock()

{

if (DataGridView.Rows.Count >= 2)

{

DataGridView.Rows[0].Selected = false;

DataGridView.Rows[1].Selected = false;

}

private void CreateDataGridView()

{

if (TargetYm.Text == "") return;

DataGridView.Rows.Clear();

DataGridView.Columns.Clear();

DateTime ym = DateTime.Parse(TargetYm.Text);

DateTime startDay = new DateTime(ym.Year, ym.Month, 21);

ym = ym.AddMonths(1);

DateTime endDay = new DateTime(ym.Year, ym.Month, 20);

List<DataGridViewColumn> listColumn = new List<DataGridViewColumn>();

string[] mainColumn = new string[] { "ID", "型式", "工番", "数量", "追番" };

foreach (var e in mainColumn)

{

listColumn.Add(new DataGridViewTextBoxColumn

{

Name = e,

HeaderText = ""

});

}

_StartMainColumn = mainColumn.Count();

while (startDay <= endDay) // 列作成

{

for (int i = 1; i <= 3; i++)

{

listColumn.Add(new DataGridViewTextBoxColumn

{

Name = startDay.ToString("yyyy/MM/dd"),

HeaderText = "",

Width = _DateColumnWidth

});

}

startDay = startDay.AddDays(1);

}

DataGridView.Columns.AddRange(listColumn.ToArray());

// ヘッダー追加

for (int i = 0; i < 4; i++)

{

DataGridView.Rows.Add("");

DataGridView.Rows[i].Height = _HeaderHeight;

}

int k = 1;

for (int c = 0; c < listColumn.Count; c++)

{

if (c < _StartMainColumn)

{

DataGridView.Rows[1].Cells[c].Value = listColumn[c].Name;

}

if (c >= _StartMainColumn)

{

DataGridView.Rows[3].Cells[c].Value = k++.ToString(); // 1,2,3

if (k == 4) k = 1;

if (DataGridView.Rows[3].Cells[c].Value.ToString() == "1")

{

DateTime.TryParse(listColumn[c].Name, out DateTime result);

DataGridView.Rows[1].Cells[c].Value = result.ToString("dd"); // 日付

DataGridView.Rows[2].Cells[c].Value = result.ToString("dddd"); // 曜日

if (c == _StartMainColumn || result.ToString("dd") == "01")

{

DataGridView.Rows[0].Cells[c].Value = result.ToString("MM");

}

SetupRowColumn();

DataLoad();

}

private void DataLoad()

{

DataGridView.RowTemplate.Height = 100;

//todo ダミー

DataGridView.Rows.Add("");

int id = 11;

for (int i = 4; i < DataGridView.Rows.Count; i++)

{

DataGridView.Rows[i].Cells["ID"].Value = id++.ToString();

}

private void SetupRowColumn()

{

//DataGridView.Columns["ID"].Visible = false;

DataGridView.Rows[0].DefaultCellStyle.BackColor = Color.AliceBlue;

DataGridView.Rows[1].DefaultCellStyle.BackColor = Color.AliceBlue;

DataGridView.Rows[2].DefaultCellStyle.BackColor = Color.AliceBlue;

DataGridView.Rows[3].DefaultCellStyle.BackColor = Color.AliceBlue;

foreach (DataGridViewColumn c in DataGridView.Columns) c.SortMode = DataGridViewColumnSortMode.NotSortable;

}

private void SetupDataGridView()

{

DataGridView.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.DisableResizing;

DataGridView.RowHeadersWidth = 4;

DataGridView.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.DisableResizing;

DataGridView.ColumnHeadersHeight = 4;

DataGridView.AllowUserToResizeColumns = false;

DataGridView.ColumnHeadersDefaultCellStyle.WrapMode = DataGridViewTriState.False;

DataGridView.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.None;

DataGridView.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.None;

DataGridView.Font = new Font("メイリオ", 9);

DataGridView.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;

DataGridView.AllowUserToAddRows = false;

DataGridView.MultiSelect = true;

typeof(DataGridView).

GetProperty("DoubleBuffered", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic).

SetValue(DataGridView, true, null);

}

class MyLabel : Label

{

// 保存

public string ID;

public string yearMonth;

public string startDay;

public string startDayOrderNumber;

public string endDay;

public string endDayOrderNumber;

// スクロール

public int rowIndex;

public int columnIndex;

}

class DateClass

{

private string TargetYm;

public object 年月

{

set

{

try

{

var dt = DateTime.Parse(Convert.ToString(value));

TargetYm = dt.ToString("yyyy年MM月");

}

catch

{

TargetYm = "";

}

get { return TargetYm; }

}

＊＊＊

中小の製造業で工程表・計画表ってなるとだいたいガントチャートに類するもので管理するのが定番で、PERTのようなものが出てくることは少ない。
さらに製品マスタ(BOM)も整っていないことが多く、生産計画も手動計算か良くても半自動程度という場合が多い。

生産計画については、内示もなく多品種少量を短納期で作っているので、そもそも計画なんてできないという理由もある。

製品マスタ(BOM)がなく、短納期対応で頻繁に調整が必要な工程表・計画表なら、わざわざ専用ソフトではなくてエクセル+VBAの方が楽ということもあるようで、実際、VBAで魔改造した工程表が便利で乗り換えられないという話もあった。