CODEWITHSUNDEEP
wpfxamldatagrid
J_C
J_C

Reputation: 99

Why doesn't this trigger work when SelectionUnit="Cell"

I want a button to be enabled only when a cell in a DataGrid is selected.

This line of XAML works when the DataGrid's SelectionUnit is set to "FullRow" :

IsEnabled="{Binding ElementName=dataGrid, Path=SelectedItems.Count}"

It no longer properly enables the button when the SelectionUnit of the DataGrid is set to "Cell"

Any idea why this is happening?

Are there any work good work-arounds?

Thanks

Upvotes: 0

Views: 201

Answers (2)

J_C
J_C

Reputation: 99

It turns out that the SelectedCells.Count property of a DataGrid does not implement INotifyPropertyChanged.

My binding was not able to notify my data trigger when the number of selected cells changed, and the data trigger value was always 0 (even though the code-behind showed otherwise)...

I ended up binding my data trigger to an internal property that tracked the selected row index of the DataGrid, and checked for it to be equal to -1.

           <Button.Style>
                <Style TargetType="Button">
                    <Setter Property="IsEnabled" Value="True" />
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding SelectedRowIndex}" Value="-1">
                            <Setter Property="IsEnabled" Value="False" />
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </Button.Style>

Upvotes: 1

15ee8f99-57ff-4f92-890c-b56153
15ee8f99-57ff-4f92-890c-b56153

Reputation: 37059

The DataGrid's SelectedCells.Count should return a nonzero value when the DataGrid is selecting by Cells. A DataTrigger in a Style on the Button can bind to that and disable the button when Value="0".

Upvotes: 1

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