Event ValueChanged when I set checkbox programmatically

[Fernan]

Hi,

I've put a custom checkbox in the header in order to select/unselect all row's checkbox. I use this code:

public class CheckBoxHeaderCell : GridHeaderCellElement
    {
        RadCheckBoxElement checkbox;

        public CheckBoxHeaderCell(GridViewColumn column, GridRowElement row)
            : base(column, row)
        {
        }

        protected override void DisposeManagedResources()
        {
            checkbox.ToggleStateChanged -= new StateChangedEventHandler(checkbox_ToggleStateChanged);
            base.DisposeManagedResources();
        }


        protected override void CreateChildElements()
        {
            base.CreateChildElements();
            checkbox = new RadCheckBoxElement();
            checkbox.ToggleStateChanged += new StateChangedEventHandler(checkbox_ToggleStateChanged);
            this.Children.Add(checkbox);
            ApplyThemeToElement(checkbox, "ControlDefault");
        }

        protected override SizeF ArrangeOverride(SizeF finalSize)
        {
            base.ArrangeOverride(finalSize);
            if (checkbox != null)
            {
                RectangleF rect = GetClientRectangle(finalSize);
                checkbox.Arrange(new RectangleF(rect.Right - 20, (rect.Height - 20) / 2, 20, 20));
            }
            return finalSize;
        }

        private void checkbox_ToggleStateChanged(object sender, StateChangedEventArgs args)
        {
            this.GridControl.BeginEdit();
            for (int i = 0; i < this.GridControl.Rows.Count; i++)
            {
                this.GridControl.Rows[i].IsSelected = true;
                this.GridControl.Rows[i].IsCurrent = true;
                this.GridControl.Rows[i].Cells["Mostrar"].Value = this.checkbox.IsChecked;
            }
            this.GridControl.EndEdit();
        }

        private void ApplyThemeToElement(RadItem item, string themeName)
        {
            DefaultStyleBuilder builder = ThemeResolutionService.GetStyleSheetBuilder((RadControl)item.ElementTree.Control,
                item.GetThemeEffectiveType().FullName, string.Empty, themeName) as DefaultStyleBuilder;

            if (builder != null)
            {
                item.Style = new XmlStyleSheet(builder.Style).GetStyleSheet();
            }
        }
    }

and:

 private void radGridView1_CreateCell(object sender, GridViewCreateCellEventArgs e)
        {
            if (e.Row is GridTableHeaderRowElement && e.Column.HeaderText == "Mostrar")
            {
                e.CellElement = new SMPDataAnalyzer.TelerikHeaderGrid.CheckBoxHeaderCell(e.Column, e.Row);
            }
        }

This works fine. But the problem is the following:

I have to detect when the row's checkbox value is change to true or false. I use the ValueChanged event :

private void radGridView1_ValueChanged(object sender, EventArgs e)
        {
            try
            {
                if (this.radGridView1.ActiveEditor is RadCheckBoxEditor)
                {
                    if (radGridView1.CurrentRow.Tag != null)
                    {
                        if ((bool)(this.radGridView1.ActiveEditor.Value) && !tendencias.ContainsKey(Convert.ToInt32(radGridView1.CurrentRow.Tag)))
                        {
                            if (radGridView1.SelectedRows.Count > 0)
                            {
                                medidastendencia = Controller.CargarValoresMedidas
                                    (long.Parse(radGridView1.CurrentRow.Cells["PuntoId"].Value.ToString()),
                                    fechaIni, fechaFin,
                                    long.Parse(radGridView1.SelectedRows[0].Cells["TipoEspectro"].Value.ToString()),
                                    long.Parse(radGridView1.SelectedRows[0].Cells["Nbanda"].Value.ToString()));

                                if (medidastendencia.Count > 0)
                                {
                                    ScatterPlot scatterPlot = new ScatterPlot();
                                    scatterPlot.XAxis = xAxis2;
                                    scatterPlot.YAxis = yAxis2;
                                    scatterPlot.Tag = Convert.ToInt32(radGridView1.CurrentRow.Tag);
                                    scatterGraphTendencias.Plots.Add(scatterPlot);
                                    int i = 0;
                                    double[] fechas = new double[medidastendencia.Count];
                                    double[] values = new double[medidastendencia.Count];
                                    foreach (MedidaTendencia mt in medidastendencia)
                                    {
                                        fechas[i] = (Double)(DataConverter.Convert(mt.FechaMedida, typeof(Double)));
                                        values[i] = mt.Valor;
                                        i++;
                                    }
                                    scatterPlot.PlotXY(fechas, values);
                                    xyCursor2.Plot = scatterPlot;
                                    xyCursor2.SnapMode = CursorSnapMode.NearestPoint;
                                    xyCursor2.MoveNext();
                                    xyCursor2.MovePrevious();
                                    xyCursor2.Visible = true;
                                    if (!isTendenciaVisible)
                                    {
                                        isTendenciaVisible = true;
                                        activeTend();
                                    }
                                    tendencias.Add(Convert.ToInt32(radGridView1.CurrentRow.Tag), values);
                                }
                                else
                                {
                                    MessageBox.Show(Properties.Resources.ERROR_MEDIDAS_TEND);
                                }
                            }
                        }
                        else
                        {
                            //Se ha puesto a false
                            if (tendencias.ContainsKey(Convert.ToInt32(radGridView1.CurrentRow.Tag)))
                            {
                                int i = 0;
                                foreach (ScatterPlot plot in scatterGraphTendencias.Plots)
                                {
                                    if (plot.Tag.ToString() == radGridView1.CurrentRow.Tag.ToString())
                                    {
                                        if (i > 1)
                                        {
                                            xyCursor2.Plot = scatterGraphTendencias.Plots[i - 1];
                                            xyCursor2.MoveNext();
                                            xyCursor2.MovePrevious();
                                        }
                                        else
                                        {
                                            if (scatterGraphTendencias.Plots.Count > 2)
                                            {
                                                xyCursor2.Plot = scatterGraphTendencias.Plots[i + 1];
                                                xyCursor2.MoveNext();
                                                xyCursor2.MovePrevious();
                                            }
                                            else
                                            {
                                                xyCursor2.Plot = scatterPlot2;
                                                xyCursor2.Visible = false;

                                                desactiveTend();
                                            }
                                        }
                                        scatterGraphTendencias.Plots.Remove(plot);
                                        plot.Dispose();
                                        break;
                                    }
                                    i++;
                                }
                                tendencias.Remove(Convert.ToInt32(radGridView1.CurrentRow.Tag));
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                string message = ex.Message;
            }
        }

But..., when I use the header checkbox in order to select/unselect all,the ActiveEditor property is null.

¿How do I this?

Thank you,

Fernan,

[Svett]

Hello Fernan,

GridHeaderCellElement is not a data cell. Therefore, it does not store a value from your data source. The ActiveEditor property of RadGridView points to editors contained only in data cells, so you cannot set your editor to the ActiveEditor property. As a workaround, you can use RadGridView's Tag property as a field where you can store the header cell's check box when you change its toggle state:

private void checkbox_ToggleStateChanged(object sender, StateChangedEventArgs args)
{
    this.GridControl.Tag = this.checkbox;
    this.GridControl.BeginEdit();
    for (int i = 0; i < this.GridControl.Rows.Count; i++)
    {
        this.GridControl.Rows[i].Cells[this.ColumnIndex].Value = this.checkbox.IsChecked;
    }

    this.GridControl.EndEdit();
    this.GridControl.Tag = null;
}

Then you can access it in ValueChanged event:

private void radGridView1_ValueChanged(object sender, EventArgs e)
{
     if (this.radGridView1.ActiveEditor is RadCheckBoxEditor || this.radGridView1.Tag is RadCheckBoxElement)
     {
    // TO DO: your operation here
     }
     else
     {
    // TO DO: your else-operation here
     }
}

All the best,
Svett
the Telerik team

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[Fernan]

Thank you, it's a perfect solution!

Fernan,

[Bao]

Can i check/uncheck for checkbox header through the button ?

[Bao]

I found it . 

[Oliver]

Hi Bao,

can you explain how to set the HeaderCheckbox programmatically?
Thanks.

Oliver

[Dess | Tech Support Engineer, Principal]

Hello, Oliver,  

Thank you for writing.  

In order to toggle the checkbox in the header cell you can use the following code snippet: 

GridViewCheckBoxColumn checkBoxColumn = this.radGridView1.Columns["Discontinued"] as GridViewCheckBoxColumn;
checkBoxColumn.EnableHeaderCheckBox = true;
checkBoxColumn.Checked = Telerik.WinControls.Enumerations.ToggleState.On;

I hope this information helps. Should you have further questions I would be glad to help.

Regards,
Dess
Progress Telerik

[Oliver]

Hallo Dess,

thank you for writing.

The solution is in my case not sucessfull.

I want to toggle two Headercheckboxes.

If the col1 header checkbox is checked (all cells in col1 were checked too) and the header checkbox in col2 (and its cells) must be unchecked. 

Here my snippet:

private void ReSyncGridView_HeaderCellToggleStateChanged(object sender, GridViewHeaderCellEventArgs e)        {            string name = e.Column.Name; //colSync,colDelete            string value = e.State.ToString(); //On,Off            //toggeln            if (name == "colDelete" && value == "On")            {                //colSync auf 0 setzen                GridViewCheckBoxColumn checkBoxColumn = this.ReSyncGridView.Columns["colSync"] as GridViewCheckBoxColumn;                checkBoxColumn.EnableHeaderCheckBox = true;                checkBoxColumn.Checked = Telerik.WinControls.Enumerations.ToggleState.Off;            }            if (name == "colSync" && value == "On")            {                //colDelete auf 0 setzen                GridViewCheckBoxColumn checkBoxColumn = this.ReSyncGridView.Columns["colDelete"] as GridViewCheckBoxColumn;                checkBoxColumn.EnableHeaderCheckBox = true;                checkBoxColumn.Checked = Telerik.WinControls.Enumerations.ToggleState.Off;            }        }

Habe you any idea, whats wrong with it?

Thanks for your help.

Oliver

 

[Dess | Tech Support Engineer, Principal]

Hello, Oliver,    

Thank you for writing back. 

I have attached a sample project for your reference demonstrating how to untoggle a certain GridViewCheckBoxColumn when another one is toggled.

I hope this information helps. If you have any additional questions, please let me know. 

 Regards,
Dess
Progress Telerik