How to handle selection when loading GridControl inside another GridControl?
You can add the WPF GridControl to inside the grid cell by using grid.Model.CellModels.Add() method and set the CellType as CustomGrid for add new grid into needed cells of parent grid.
Refer the below code for your reference.
XAML
<Grid> <local:CustomGrid x:Name="child" Visibility="Visible" /> </Grid>
C#
//Add custom grid
grid.Model.CellModels.Add("CustomGrid", new CustomGridCellModel());
public class CustomGridCellModel : GridCellModel<CustomGridCellRenderer> { }
public class CustomGridCellRenderer : GridVirtualizingCellRenderer<UserControl1>
{
public CustomGridCellRenderer()
{ }
public override void CreateRendererElement(UserControl1 uiElement, GridRenderStyleInfo style)
{
if (this.GridControl.Tag != null)
{
var range = this.GridControl.Model.SelectedRanges;
var grid = uiElement.child;
if (range != null && range.AnyRangeContains(GridRangeInfo.Cell(style.CellIdentity.RowIndex, style.CellIdentity.ColumnIndex)))
{
if (grid.Model.SelectedRanges.Count == 0)
{
grid.Model.SelectedRanges.Add(GridRangeInfo.Table());
grid.InvalidateCell(GridRangeInfo.Cell(0, 0));
}
}
else
{
grid.Model.SelectedRanges.Clear();
grid.InvalidateCells();
}
}
base.CreateRendererElement(uiElement, style);
}
}
The GridControl do not have the support to draw the selection on cell UIElements. Selection will be rendered on the cell then only UIElements are drawn in our GridControl. So, if you want to select the inner grid elements while selecting the parent row or top left cell, you can use the grid.Model.SelectionChanging event.
Refer the below code for your reference.
C#
grid.Model.SelectionChanging += Model_SelectionChanging;
private void Model_SelectionChanging(object sender, GridSelectionChangingEventArgs e)
{
if (e.Reason == GridSelectionReason.MouseDown)
{
grid.Tag = e.Range;
if (e.Range.Top != 0)
{
var currentCell = this.grid.CurrentCell;
UIElement element;
if (currentCell.RowIndex != e.Range.Top)
{
element = this.GetInnerElement(currentCell.RowIndex, 1);
var userControl = element as UserControl1;
if (userControl != null)
{
userControl.child.Model.SelectedRanges.Clear();
userControl.child.InvalidateCells();
}
}
element = this.GetInnerElement(e.Range.Top, 1);
if (element != null)
{
var innerElement = element as UserControl1;
if (innerElement != null)
{
innerElement.child.Model.SelectedRanges.Clear();
innerElement.child.Model.SelectedRanges.Add(GridRangeInfo.Table());
innerElement.child.InvalidateCells();
}
}
}
}
else if (e.Reason == GridSelectionReason.Clear)
{
this.grid.Tag = null;
var style = this.grid.Model[this.grid.CurrentCell.RowIndex, 1];
var element = this.GetInnerElement(this.grid.CurrentCell.RowIndex, 1);
if (element != null)
{
var innerElement = element as UserControl1;
if (innerElement != null)
{
innerElement.child.Model.SelectedRanges.Clear();
innerElement.child.InvalidateCells();
}
}
}
}
private UIElement GetInnerElement(int rowIndex, int colIndex)
{
var element = this.grid.GetCellUIElements(rowIndex, colIndex);
if (element != null && element.UIElements.Count > 0)
{
var innerElement = element.UIElements[0];
if (innerElement != null)
{
return innerElement;
}
}
return null;
}
If you want to select the top left cell of inner grid while selecting the parent row or top left cell, you can override the OnQueryCellInfo method.
Refer the below code for your reference.
protected override void OnQueryCellInfo(GridQueryCellInfoEventArgs e)
{
base.OnQueryCellInfo(e);
if (this.Model.SelectedRanges.Count > 0 && e.Cell.RowIndex == 0 && e.Cell.ColumnIndex == 0)
{
e.Style.CellType = "Static";
e.Style.Background = new SolidColorBrush(Color.FromRgb(132, 177, 213));
}
}
The below image shows the selection for entire grid while clicking the top left of parent grid
The below image shows the selection for inner grid row while clicking the parent grid row
Sample: View sample in GitHub
Conclusion
I hope you enjoyed learning about how to handle selection when loading GridControl inside another GridControl.
You can refer to our WPF GridControl feature tour page to know about its other groundbreaking feature representations. You can also explore our WPF GridControl documentation to understand how to create and manipulate data.
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