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425
Select Row by check box instead of row selector
posted

Hi

What are the best solution to use check box in a column to change the selected row(s) instead of using the row selector? I need to enable, or disable a form button base on the row.selected.count

I was supprised that it is much more difficult than I thought it would be.

Regards

Bryan

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  • 469350
    Verified Answer
    Offline posted

    Hi Bryan,

    There's no easy way to associate the selected state of a row with a CheckBox. Once a cell goes into edit mode in the grid (which is must do in order to check/uncheck a checkbox), any selection will be lost.So what you need to do here is simulate selection without using actual selection.

    What I would do is keep my own List<UltraGridRow> of the "selected" rows. Every time the checkbox changes, you update the list.

    Here's some sample code:


          
            private List<UltraGridRow> selectedRows = new List<UltraGridRow>();
            private void ultraGrid1_InitializeLayout(object sender, Infragistics.Win.UltraWinGrid.InitializeLayoutEventArgs e)
            {
                UltraGridLayout layout = e.Layout;
                UltraGridOverride ov = layout.Override;
                UltraGridBand band = layout.Bands[0];


                // Turn off row selection.
                ov.SelectTypeRow = SelectType.None;

                // Add an unbound CheckBox (coolean) column to the grid to handle selection.
                if (false == band.Columns.Exists("Selected"))
                {
                    UltraGridColumn selectedColumn = band.Columns.Add("Selected");
                    selectedColumn.DataType = typeof(bool);
                    selectedColumn.Header.VisiblePosition = 0;
                }

                // Created an appearance for the selected row(s).
                if (false == layout.Appearances.Exists("Selected"))
                {
                    Infragistics.Win.Appearance selectedRowAppearance = layout.Appearances.Add("Selected");
                    selectedRowAppearance.BackColor = SystemColors.Highlight;
                    selectedRowAppearance.ForeColor = SystemColors.HighlightText;              
                }
            }

            private void ultraGrid1_CellChange(object sender, CellEventArgs e)
            {
                // Check for changes in the "Selected" column.
                if ("Selected" == e.Cell.Column.Key)
                {
                    // If the checkbox is checked, add the row to our selected rows list.
                    // If the checkbox is unchecked, remove it from the list.
                    UltraGridRow row = e.Cell.Row;
                    bool isSelected = bool.Parse(e.Cell.Text);
                    if (isSelected)
                        this.selectedRows.Add(row);
                    else
                        this.selectedRows.Remove(row);

                    // Update the appearance of the row based on the state of the "Selected" checkbox.
                    UpdateSelectedRowAppearance(row);
                }
            }

            private void ultraGrid1_InitializeRow(object sender, InitializeRowEventArgs e)
            {
                // Update the appearance of the row based on the state of the "Selected" checkbox.            
                UltraGridRow row = e.Row;
                UpdateSelectedRowAppearance(row);
            }

            // Updates the appearance of the row based on whether or not the "Selected" checkbox is checked.
            private static void UpdateSelectedRowAppearance(UltraGridRow row)
            {
                if (true == row.Cells.Exists("Selected"))
                {
                    bool isSelected = bool.Parse(row.Cells["Selected"].Text);
                    if (isSelected)
                        row.Appearance = row.Band.Layout.Appearances["Selected"];
                    else
                        row.Appearance = null;
                }
            }

     

     

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