带CheckBox列头的DataGridView(二)

ゞ浴缸里的玫瑰 2022-01-11 19:47 187阅读 0赞

上次从CodeProject上发现了一个老外写的开源的带CheckBox列头的类，当时就将文章翻译了过来并做成了一个小Demo，供大家参考，最近在开发中需要用到这个类，因此加以了改进，上次还有一个兄弟提到问怎样实现取消列表中选择的一行，列头的全选CheckBox也能处于不选中状态。这是一个很好的问题，我最近几天花了些时间，将其进行了些修改。终于可以实现这一功能了。废话不多说了，代码如下：

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
using System.Drawing;  
using System.Windows.Forms;

namespace chbDGV  
\{  
    public delegate void CheckBoxClickedHandler(bool state);

/// <summary>  
    /// 改变列头的CheckBox的状态  
    /// </summary>  
    /// <param name="state"></param>  
    public delegate void ChangeCheckBoxStatusHandler(bool state);

public class DataGridViewCheckBoxHeaderCellEventArgs : EventArgs  
    \{  
        bool \_bChecked;  
        public DataGridViewCheckBoxHeaderCellEventArgs(bool bChecked)  
        \{  
            \_bChecked = bChecked;  
        \}

public bool Checked  
        \{  
            get \{ return \_bChecked; \}  
        \}  
    \}

class DatagridViewCheckBoxHeaderCell : DataGridViewColumnHeaderCell  
    \{  
        Point checkBoxLocation;  
        Size checkBoxSize;  
        bool \_checked = false;  
        Point \_cellLocation = new Point();  
        System.Windows.Forms.VisualStyles.CheckBoxState \_cbState =  
            System.Windows.Forms.VisualStyles.CheckBoxState.UncheckedNormal;  
        public event CheckBoxClickedHandler OnCheckBoxClicked;  
        public event ChangeCheckBoxStatusHandler OnChangeCheckBoxStatusHandler;

public DatagridViewCheckBoxHeaderCell()  
        \{  
        \}

protected override void Paint(System.Drawing.Graphics graphics,  
            System.Drawing.Rectangle clipBounds,  
            System.Drawing.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 p = new Point();  
            Size s = CheckBoxRenderer.GetGlyphSize(graphics,  
            System.Windows.Forms.VisualStyles.CheckBoxState.UncheckedNormal);  
            p.X = cellBounds.Location.X +  
                (cellBounds.Width / 2) - (s.Width / 2);  
            p.Y = cellBounds.Location.Y +  
                (cellBounds.Height / 2) - (s.Height / 2);  
            \_cellLocation = cellBounds.Location;  
            checkBoxLocation = p;  
            checkBoxSize = s;  
            if (\_checked)  
                \_cbState = System.Windows.Forms.VisualStyles.  
                    CheckBoxState.CheckedNormal;  
            else  
                \_cbState = System.Windows.Forms.VisualStyles.  
                    CheckBoxState.UncheckedNormal;  
            CheckBoxRenderer.DrawCheckBox  
            (graphics, checkBoxLocation, \_cbState);  
        \}

protected override void OnMouseClick(DataGridViewCellMouseEventArgs e)  
        \{  
            Point p = new Point(e.X + \_cellLocation.X, e.Y + \_cellLocation.Y);  
            if (p.X >= checkBoxLocation.X && p.X <=  
                checkBoxLocation.X + checkBoxSize.Width  
            && p.Y >= checkBoxLocation.Y && p.Y <=  
                checkBoxLocation.Y + checkBoxSize.Height)  
            \{  
                \_checked = !\_checked;  
                if (OnCheckBoxClicked != null)  
                \{  
                    OnCheckBoxClicked(\_checked);  
                    this.DataGridView.InvalidateCell(this);  
                \}

\}  
            base.OnMouseClick(e);  
        \}

/// <summary>  
        /// 改变列头CheckBox的状态的事件  
        /// </summary>  
        /// <param name="NewStatus"></param>  
        public void OnChangeCheckBoxStatus(bool NewStatus)  
        \{  
            if (OnCheckBoxClicked != null)  
            \{  
                \_checked = NewStatus;  
                if (OnChangeCheckBoxStatusHandler != null)  
                \{  
                    OnChangeCheckBoxStatusHandler(NewStatus);  
                \}  
                if (this.DataGridView != null)  
                \{  
                    this.DataGridView.InvalidateCell(this);  
                \}  
            \}  
        \}

\}  
\}

测试的代码如下：

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

namespace chbDGV  
\{  
    public partial class frmTestDGV : Form  
    \{

DataGridViewCheckBoxColumn colCB = new DataGridViewCheckBoxColumn();  
        DatagridViewCheckBoxHeaderCell cbHeader = new DatagridViewCheckBoxHeaderCell();  
        DataTable dt = new DataTable();

public frmTestDGV()  
        \{  
            InitializeComponent();  
        \}

private void Form1\_Load(object sender, EventArgs e)  
        \{  
            BindDGV();  
        \}

public override void Refresh()  
        \{

base.Refresh();  
        \}

private void cbHeader\_OnCheckBoxClicked(bool Status)  
        \{  
            for (int i = 0; i < dgvTest.Rows.Count; i++)  
            \{  
                dt.Rows\[i\]\["Select"\] = Status;  
            \}  
        \}

private void BindDGV()  
        \{  
            dt.Columns.Add("Select");  
            dt.Columns.Add("ID");  
            dt.Columns.Add("Code");  
            dt.Columns.Add("Name");  
            dt.Columns.Add("Desc");  
            for (int i = 0; i < 5; i++)  
            \{  
                dt.Rows.Add();  
                dt.Rows\[i\]\[0\] = false;  
                dt.Rows\[i\]\[1\] = "100"+i.ToString();  
                dt.Rows\[i\]\[2\] = "Lucy1001"+i.ToString();  
                dt.Rows\[i\]\[3\] = "KateTest"+i.ToString();  
                dt.Rows\[i\]\[4\] = "remark...";  
            \}

colCB.HeaderCell = cbHeader;  
             
            dgvTest.Columns.Insert(0, colCB);

cbHeader.OnCheckBoxClicked +=  
            new CheckBoxClickedHandler(cbHeader\_OnCheckBoxClicked);

dgvTest.AllowUserToAddRows = false;  
            dgvTest.AutoGenerateColumns = false;  
            dgvTest.DataSource = dt;

this.colCB.DataPropertyName = "Select";  
            this.ID.DataPropertyName = "ID";  
            this.Code.DataPropertyName = "Code";  
            this.TestName.DataPropertyName = "Name";  
            this.Desc.DataPropertyName = "Desc";  
             
        \}

/// <summary>  
        /// 点击DataGridView的行  
        /// </summary>  
        /// <param name="sender"></param>  
        /// <param name="e"></param>  
        private void dgv\_CellClick(object sender, DataGridViewCellEventArgs e)  
        \{  
            DataGridView dgvv = ((DataGridView)sender);  
            if (dgvTest.CurrentCell.OwningColumn.DataPropertyName == "Select")  
            \{  
                if (e.RowIndex != -1)  
                \{  
                    this.SetSelected(dgvv, e.RowIndex);  
                \}  
            \}  
        \}

/// <summary>  
        /// 设置DataGridView的选择  
        /// </summary>  
        /// <param name="dgvb"></param>  
        /// <param name="rowIndex"></param>  
        private void SetSelected(DataGridView dgvb, int rowIndex)  
        \{  
            if (dgvb.Rows\[rowIndex\] != null)  
            \{  
                if (dgvb.Rows\[rowIndex\].Cells\[0\].Value != null && dgvb.Rows\[rowIndex\].Cells\[0\].Value.ToString() != "")  
                \{  
                    bool status = !Convert.ToBoolean(dgvb.Rows\[rowIndex\].Cells\[0\].Value);  
                    dt.Rows\[rowIndex\]\[0\] = status;  
                    dgvb.Rows\[rowIndex\].Cells\[0\].Value = status;  
                    for (int i = 0; i < dgvb.Rows.Count; i++)  
                    \{  
                        if (dgvb.Rows\[i\].Cells\[0\].Value != null && dgvb.Rows\[i\].Cells\[0\].Value.ToString() != "")  
                        \{  
                            status = Convert.ToBoolean(dgvb.Rows\[i\].Cells\[0\].Value);  
                            if (!status)  
                            \{  
                                cbHeader.OnChangeCheckBoxStatus(status);  
                                break;  
                            \}  
                        \}  
                    \}  
                    if (status)  
                    \{  
                        cbHeader.OnChangeCheckBoxStatus(status);  
                    \}  
                    dgvb.EndEdit();  
                \}  
                else  
                \{  
                    bool status1 = false;  
                    dgvb.Rows\[rowIndex\].Cells\[0\].Value = dt.Rows\[rowIndex\]\[0\].ToString();  
                    for (int i = 0; i < dgvb.Rows.Count; i++)  
                    \{  
                        if (dgvb.Rows\[i\].Cells\[0\].Value != null && dgvb.Rows\[i\].Cells\[0\].Value.ToString() != "")  
                        \{  
                            status1 = Convert.ToBoolean(dgvb.Rows\[i\].Cells\[0\].Value);  
                            if (!status1)  
                            \{  
                                cbHeader.OnChangeCheckBoxStatus(status1);  
                                break;  
                            \}  
                        \}  
                    \}  
                    if (status1)  
                    \{  
                        cbHeader.OnChangeCheckBoxStatus(status1);  
                    \}  
                    dgvb.EndEdit();  
                \}  
            \}  
        \}

\}  
\}

代码比较简单，我就没有加很多注释，也不介绍了。代码我会放在我的资源中供大家下载，资源名为：[带CheckBox列头有全选择功能的DataGridView][CheckBox_DataGridView]二。

转载于:https://www.cnblogs.com/kevinGao/archive/2012/09/14/2776042.html

[CheckBox_DataGridView]: http://download.csdn.net/detail/weizhiai12/4445491