Hello Roman,
RadGridView uses UI virtualization which means that cell elements are created only for currently visible cells and are being reused during operations like scrolling, filtering, grouping and so on. This is why not all data row objects can be visible at the same time in the RadGridView estate area in your application. I suppose that you create a custom cell in order to show two checkboxes with an image. You are on the right to override the SetContentCore method that is used to update the checkboxes according to the cell value. Note, that you should access the data row which is represented as RowInfo and DataBoundItem that gets the data-bound object which populates the row.
I created a sample example for your reference where I create a custom column with a custom cell and override the SetContentCore method. I use the ToggleStateChanged event to update the underlying data source accordingly as well. Please refer to the following code snippet:
public RadForm1()
{
InitializeComponent();
BindingList<RowItem> myList = new BindingList<RowItem>();
myList.Add(new RowItem(new MyItem(true, true)));
myList.Add(new RowItem(new MyItem(true, true)));
myList.Add(new RowItem(new MyItem(true, true)));
myList.Add(new RowItem(new MyItem(false, false)));
myList.Add(new RowItem(new MyItem(false, true)));
myList.Add(new RowItem(new MyItem(false, true)));
myList.Add(new RowItem(new MyItem(false, true)));
CustomColumn customColumn = new CustomColumn("CustomColumn");
customColumn.FieldName = "Item";
this.radGridView1.Columns.Add(customColumn);
this.radGridView1.DataSource = myList;
this.radGridView1.TableElement.RowHeight = 60;
}
}
public class CustomColumn : GridViewDataColumn
{
public CustomColumn(string fieldName)
: base(fieldName)
{
}
public override Type GetCellType(GridViewRowInfo row)
{
if (row is GridViewDataRowInfo)
{
return typeof(CustomCellElement);
}
return base.GetCellType(row);
}
}
public class CustomCellElement : GridDataCellElement
{
StackLayoutElement stack = new StackLayoutElement();
private RadCheckBoxElement checkBox1;
private RadCheckBoxElement checkBox2;
public CustomCellElement(GridViewColumn column, GridRowElement row)
: base(column, row)
{
}
protected override void CreateChildElements()
{
base.CreateChildElements();
stack.Orientation = Orientation.Vertical;
this.checkBox1 = new RadCheckBoxElement();
this.checkBox2 = new RadCheckBoxElement();
stack.Children.Add(this.checkBox1);
stack.Children.Add(this.checkBox2);
this.Children.Add(stack);
this.checkBox1.ToggleStateChanged += this.CheckBox1_ToggleStateChanged;
this.checkBox2.ToggleStateChanged += this.CheckBox2_ToggleStateChanged;
}
private void CheckBox2_ToggleStateChanged(object sender, StateChangedEventArgs args)
{
MyItem item = this.RowInfo.Cells["Item"].Value as MyItem;
item.isEnabled = checkBox2.IsChecked;
}
private void CheckBox1_ToggleStateChanged(object sender, StateChangedEventArgs args)
{
MyItem item = this.RowInfo.Cells["Item"].Value as MyItem;
item.isActive = checkBox1.IsChecked;
}
protected override void SetContentCore(object value)
{
stack.Image = Properties.Resources.crayon;
stack.StretchHorizontally = true;
stack.StretchVertically = true;
if (this.RowInfo != null && this.RowInfo.DataBoundItem != null && this.Value!=null)
{
MyItem item = this.RowInfo.Cells["Item"].Value as MyItem;
this.checkBox1.ToggleStateChanged -= this.CheckBox1_ToggleStateChanged;
this.checkBox2.ToggleStateChanged -= this.CheckBox2_ToggleStateChanged;
this.checkBox1.IsChecked = item.isActive;
this.checkBox2.IsChecked = item.isEnabled;
this.checkBox1.ToggleStateChanged += this.CheckBox1_ToggleStateChanged;
this.checkBox2.ToggleStateChanged += this.CheckBox2_ToggleStateChanged;
}
}
protected override Type ThemeEffectiveType
{
get
{
return typeof(GridDataCellElement);
}
}
public override bool IsCompatible(GridViewColumn data, object context)
{
return data is CustomColumn && context is GridDataRowElement;
}
}
public class RowItem
{
public MyItem Item { get; set; }
public RowItem(MyItem myItem)
{
this.Item = myItem;
}
}
public class MyItem
{
public MyItem(bool isActive, bool isEnabled)
{
this.isActive = isActive;
this.isEnabled = isEnabled;
}
public bool isActive { get; set; }
public bool isEnabled { get; set; }
}I hope this information is useful. Let me know if you need further assistance.
Regards,
Nadya
Progress Telerik
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