DataGridView中实现checkbox全选的自定义控件

在DataGridView中实现Checkbox的全选的方法就是在列头画一个checkbox, 并给其一个事件.

这个之前很多blog都有写, 这里就不多废话了,  codeproject上面有示例代码.

这里我们再多做一层的封装,将其封装成一个控件,这样的话, 我们就可以最大程度上的复用, 而不需要老是重复写同样的, 无聊的代码了!

思路如下:

继承DataGridViewCheckBoxColumn类, 更改它的headerCell的样式. 添加cellValueChanged时间,使在进行复选框选择的时候可以触发事件,从而进行处理.

继承DataGridViewColumnHeaderCell类, 重新绘制一个带CheckBox的HeaderCell

 

话不多说直接上代码了, 如果有不懂的欢迎留言:

public class DataGridViewCheckBoxColumnSelectAll : DataGridViewCheckBoxColumn
    {
        private DatagridViewCheckBoxHeaderCell headerCell;
        private bool loaded;

        public event CheckBoxClickedHandler OnCheckBoxClicked;
        int TotalCheckedCheckBoxes = 0;
        bool IsHeaderCheckBoxClicked = false;

        public DataGridViewCheckBoxColumnSelectAll()
        {
            this.headerCell = new DatagridViewCheckBoxHeaderCell();
            base.HeaderCell = this.headerCell;

            this.headerCell.OnCheckBoxClicked += new CheckBoxClickedHandler(this.headerCell_OnCheckBoxClicked);
            this.loaded = false;
           
        }

        public DataGridViewCheckBoxColumnSelectAll(bool threeState)
            : base(threeState)
        {
            this.headerCell = new DatagridViewCheckBoxHeaderCell();
            base.HeaderCell = this.headerCell;
        }

        /// <summary>
        /// 在DataGridView改变时进行事件的绑定
        /// </summary>
        protected override void OnDataGridViewChanged()
        {
            if (this.DataGridView!=null)
            {
                this.DataGridView.CellValueChanged -= DataGridView_CellValueChanged;
                this.DataGridView.CellValueChanged += DataGridView_CellValueChanged;
                this.DataGridView.CurrentCellDirtyStateChanged -= DataGridView_CurrentCellDirtyStateChanged;
                this.DataGridView.CurrentCellDirtyStateChanged += DataGridView_CurrentCellDirtyStateChanged;
            }
        }

        /// <summary>
        /// 在复选的时候进行判断.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void DataGridView_CellValueChanged(object sender, DataGridViewCellEventArgs e)
        {
            if (e.RowIndex>=0&&e.ColumnIndex>=0)
            {
                if (!IsHeaderCheckBoxClicked)
                    RowCheckBoxClick((DataGridViewCheckBoxCell)this.DataGridView[e.ColumnIndex, e.RowIndex]);
            }
           
        }

        /// <summary>
        /// 在复选框被选中的时候触发该事件, 该事件用于触发ValueChanged事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void DataGridView_CurrentCellDirtyStateChanged(object sender, EventArgs e)
        {
            if (this.DataGridView.CurrentCell is DataGridViewCheckBoxCell)
                this.DataGridView.CommitEdit(DataGridViewDataErrorContexts.Commit);
        }

        /// <summary>
        /// 复选框被点击时所需要做的操作
        /// </summary>
        /// <param name="checkBox"></param>
        private void RowCheckBoxClick(DataGridViewCheckBoxCell checkBox)
        {
            var head = this.headerCell as DatagridViewCheckBoxHeaderCell;
            if (checkBox != null)
            {
                //计算所有被选中的行的数量 
                if ((bool)checkBox.Value && TotalCheckedCheckBoxes < this.DataGridView.RowCount)
                    TotalCheckedCheckBoxes++;
                else if (TotalCheckedCheckBoxes > 0)
                    TotalCheckedCheckBoxes--;

                //当所有复选框都被选中的时候,列的头上的复选框被选中, 反之则不被选中.
                if (TotalCheckedCheckBoxes < this.DataGridView.RowCount)
                    head.IsChecked = false;
                else if (TotalCheckedCheckBoxes == this.DataGridView.RowCount)
                    head.IsChecked = true;
                //强制repained
                head.DataGridView.InvalidateCell(head);
            }
        }


        /// <summary>
        /// 头被选中时触发OnCheckBoxClicked事件.
        /// </summary>
        /// <param name="state"></param>
        private void headerCell_OnCheckBoxClicked(bool state)
        {
            if (this.OnCheckBoxClicked != null)
            {
                this.OnCheckBoxClicked(state);
            }
        }

    }

 public delegate void CheckBoxClickedHandler(bool state);

    internal class DatagridViewCheckBoxHeaderCell : DataGridViewColumnHeaderCell
    {
        private CheckBoxState _cbState = CheckBoxState.UncheckedNormal;
        private Point _cellLocation = new Point();
        private bool _checked;
        private Point checkBoxLocation;
        private Size checkBoxSize;

        public bool IsChecked
        {
            get
            {
                return _checked;
            }

            set
            {
                _checked = value;
                if (this._checked)
                {
                    this._cbState = CheckBoxState.CheckedNormal;
                }
                else
                {
                    this._cbState = CheckBoxState.UncheckedNormal;
                }
            }
        }

        public event CheckBoxClickedHandler OnCheckBoxClicked;

        /// <summary>
        /// 点击列头的时候触发的事件,这里有个判断, 如果点击的位置是复选框则触发OnCheckBoxClicked事件.
        /// </summary>
        /// <param name="e"></param>
        protected override void OnMouseClick(DataGridViewCellMouseEventArgs e)
        {
            Point point = new Point(e.X + this._cellLocation.X, e.Y + this._cellLocation.Y);
            if (((point.X >= this.checkBoxLocation.X) && (point.X <= (this.checkBoxLocation.X + this.checkBoxSize.Width))) && ((point.Y >= this.checkBoxLocation.Y) && (point.Y <= (this.checkBoxLocation.Y + this.checkBoxSize.Height))))
            {
                this._checked = !this._checked;
                bool temp = this._checked;
                if (this.OnCheckBoxClicked != null)
                {
                    this.OnCheckBoxClicked(this._checked);
                    base.DataGridView.InvalidateCell(this);
                }
                foreach (DataGridViewRow row in base.DataGridView.Rows)
                {
                    ((DataGridViewCheckBoxCell)row.Cells[e.ColumnIndex]).Value = temp;
                }
                base.DataGridView.RefreshEdit();

            }
            base.OnMouseClick(e);
        }

        /// <summary>
        /// 绘制一个CheckBox
        /// </summary>
        protected override void Paint(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, int rowIndex, DataGridViewElementStates dataGridViewElementState, object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
        {
            base.Paint(graphics, clipBounds, cellBounds, rowIndex, dataGridViewElementState, value, formattedValue, errorText, cellStyle, advancedBorderStyle, paintParts);
            Point point = new Point();
            Size glyphSize = CheckBoxRenderer.GetGlyphSize(graphics, CheckBoxState.UncheckedNormal);
            point.X = (cellBounds.Location.X + (cellBounds.Width / 2)) - (glyphSize.Width / 2);
            point.Y = (cellBounds.Location.Y + (cellBounds.Height / 2)) - (glyphSize.Height / 2);
            this._cellLocation = cellBounds.Location;
            this.checkBoxLocation = point;
            this.checkBoxSize = glyphSize;
            if (this._checked)
            {
                this._cbState = CheckBoxState.CheckedNormal;
            }
            else
            {
                this._cbState = CheckBoxState.UncheckedNormal;
            }
            CheckBoxRenderer.DrawCheckBox(graphics, this.checkBoxLocation, this._cbState);
        }

       

       
       
    }

　　源码位置:

http://pan.baidu.com/s/1jGJzErs

转载于:https://www.cnblogs.com/he-yuan/p/4300678.html