Winform下的Datagrid的列风格(3)—DataGridTimePickerColumn(转)

class DataGridTimePickerColumn : DataGridColumnStyle 
    {
        private DateTimePicker myDateTimePicker = new DateTimePicker();
        // The isEditing field tracks whether or not the user is
        // editing data with the hosted control.
        private bool isEditing;

        public DataGridTimePickerColumn() : base() 
        {
            myDateTimePicker.Visible = false;
        }

        protected override void Abort(int rowNum)
        {
            isEditing = false;
            myDateTimePicker.ValueChanged -= 
                new EventHandler(TimePickerValueChanged);
            Invalidate();
        }

        protected override bool Commit
            (CurrencyManager dataSource, int rowNum) 
        {
            myDateTimePicker.Bounds = Rectangle.Empty;
         
            myDateTimePicker.ValueChanged -= 
                new EventHandler(TimePickerValueChanged);

            if (!isEditing)
                return true;

            isEditing = false;

            try 
            {
                DateTime value = myDateTimePicker.Value;
                SetColumnValueAtRow(dataSource, rowNum, value);
            } 
            catch (Exception) 
            {
                Abort(rowNum);
                return false;
            }

            Invalidate();
            return true;
        }

        protected override void Edit(
            CurrencyManager source, 
            int rowNum,
            Rectangle bounds, 
            bool readOnly,
            string instantText, 
            bool cellIsVisible) 
        {
            DateTime value = (DateTime) 
                GetColumnValueAtRow(source, rowNum);
            if (cellIsVisible) 
            {
                myDateTimePicker.Bounds = new Rectangle
                    (bounds.X + 2, bounds.Y + 2, 
                    bounds.Width - 4, bounds.Height - 4);
                myDateTimePicker.Value = value;
                myDateTimePicker.Visible = true;
                myDateTimePicker.ValueChanged += 
                    new EventHandler(TimePickerValueChanged);
            } 
            else 
            {
                myDateTimePicker.Value = value;
                myDateTimePicker.Visible = false;
            }

            if (myDateTimePicker.Visible)
                DataGridTableStyle.DataGrid.Invalidate(bounds);
        }

        protected override Size GetPreferredSize(
            Graphics g, 
            object value) 
        {
            return new Size(100, myDateTimePicker.PreferredHeight + 4);
        }

        protected override int GetMinimumHeight() 
        {
            return myDateTimePicker.PreferredHeight + 4;
        }

        protected override int GetPreferredHeight(Graphics g, 
            object value) 
        {
            return myDateTimePicker.PreferredHeight + 4;
        }

        protected override void Paint(Graphics g, 
            Rectangle bounds, 
            CurrencyManager source, 
            int rowNum) 
        {
            Paint(g, bounds, source, rowNum, false);
        }
        protected override void Paint(
            Graphics g, 
            Rectangle bounds,
            CurrencyManager source, 
            int rowNum,
            bool alignToRight) 
        {
            Paint(
                g,bounds, 
                source, 
                rowNum, 
                Brushes.Red, 
                Brushes.Blue, 
                alignToRight);
        }
        protected override void Paint(
            Graphics g, 
            Rectangle bounds,
            CurrencyManager source, 
            int rowNum,
            Brush backBrush, 
            Brush foreBrush,
            bool alignToRight) 
        {
            DateTime date = (DateTime) 
                GetColumnValueAtRow(source, rowNum);
            Rectangle rect = bounds;
            g.FillRectangle(backBrush,rect);
            rect.Offset(0, 2);
            rect.Height -= 2;
            g.DrawString(date.ToString("d"), 
                this.DataGridTableStyle.DataGrid.Font, 
                foreBrush, rect);
        }

        protected override void SetDataGridInColumn(DataGrid value) 
        {
            base.SetDataGridInColumn(value);
            if (myDateTimePicker.Parent != null) 
            {
                myDateTimePicker.Parent.Controls.Remove 
                    (myDateTimePicker);
            }
            if (value != null) 
            {
                value.Controls.Add(myDateTimePicker);
            }
        }

        private void TimePickerValueChanged(object sender, EventArgs e) 
        {
            this.isEditing = true;
            base.ColumnStartedEditing(myDateTimePicker);
        }
    }