A DataGridView Column Show/Hide Popup - Menu Style

• Download demo project - 10.9 KB
• Download source - 35.6 KB

Introduction

I needed to allow my customers to be able to show/hide columns in a DataGridView.

Original source

DGVColumnSelector.aspx.

Background

There is a great article mentioned above (Thank you Vincenzo Rossi). It does exactly what I needed to do. (Please see the original article on how to use the ToolStripDropDown and ToolStripControlHost classes). The only thing I did not like - the usage of the check boxes - it seems to be old-fashioned... I replaced that with a menu-like control.

Using the code

Please refer to the original code if you have any questions regarding using the code. My additions are the UserControlMenu and MenuControl objects. Instead of using the original CheckedListBox, you will use UserControlMenu. You will need to define two events: OnDone and CheckedChangedEnent:

UserControlMenu pUserControl1 = new UserControlMenu();

public DataGridViewColumnSelector() {
    //mCheckedListBox = new CheckedListBox();
    //mCheckedListBox.CheckOnClick = true;
    //mCheckedListBox.ItemCheck += 
    //    new ItemCheckEventHandler(mCheckedListBox_ItemCheck);

    //ToolStripControlHost mControlHost = new ToolStripControlHost(mCheckedListBox);
    pUserControl1.DoneEvent += new EventHandler(OnDone);
    pUserControl1.CheckedChangedEnent += 
              new UserControlMenu.CheckedChanged(CheckedChangedEnent);
    ToolStripControlHost mControlHost = new ToolStripControlHost(pUserControl1);
...
}

void CheckedChangedEnent(int iIndex, bool bChecked)
{
    mDataGridView.Columns[iIndex].Visible = bChecked;
}

private void OnDone(object sender, EventArgs e)
{
    mPopup.AutoClose = false;
    mPopup.Close();
    mPopup.AutoClose = true;
}

On CellMouseClick, you will need to use a new object one more time:

void mDataGridView_CellMouseClick(object sender, DataGridViewCellMouseEventArgs e)
{
    if (e.Button == MouseButtons.Right && e.RowIndex==-1 && e.ColumnIndex==-1) {
        //mCheckedListBox.Items.Clear();
        //foreach (DataGridViewColumn c in mDataGridView.Columns){
        //    mCheckedListBox.Items.Add(c.HeaderText, c.Visible);
        //}
        //int PreferredHeight = (mCheckedListBox.Items.Count * 16) + 7;
        //mCheckedListBox.Height =
        //      (PreferredHeight < MaxHeight) ? PreferredHeight : MaxHeight;
        //mCheckedListBox.Width = this.Width;
        pUserControl1.Initialize(mDataGridView);
        mPopup.Show(mDataGridView.PointToScreen(new Point (e.X,e.Y)));
    }
}

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)