CODEWITHSUNDEEP
c#wpfxamldatagrid
user1186751
user1186751

Reputation: 13

How to make wpf DataGridRow selected color override bound background color of DataGridCell?

I have a DataGridTemplateColumn that defines a TextBlock which has bound Background and Foreground properties. This allows the colors to change based on the value of the bound property. So far so good, except I want the default selected row color to override my bound background color. How can I do this in xaml?

<DataGridTemplateColumn Header="Text">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Path=Text}"
                       Background="{Binding Path=BackgroundColor}"
                       Foreground="{Binding Path=ForegroundColor}"/>
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>

Ultimately, it seems like I need to determine if the cell is in the selected row. If so, use the default selected row background color else use the bound background color. I am not sure how to aproach this. Any help would be appreciated.

Upvotes: 1

Views: 2478

Answers (2)

wdavo
wdavo

Reputation: 5110

This is not the most elegant solution, but it's fairly simple...

Add a 'CurrentBackgroundColor' property to your Item (needs to implement property changed), which by default you set to the BackgroundColor. This is what you bind your Background to.

Add a two-way SelectedItem binding to your DataGrid to a property with the following logic:

public Item SelectedItem
{
  get
  {
    return selectedItem;
  }
  set
  {
    if (selectedItem != value)
    {
      if (selectedItem != null)
      {
        selectedItem.CurrentBackgroundColor = selectedItem.BackgroundColor;
      }

      selectedItem = value;

      if (selectedItem != null)
      {
        selectedItem.CurrentBackgroundColor = null;
      }

      RaisePropertyChanged("SelectedItem");
    }
  }
}

What this does is

  • If there is a currently selected item, change its background back to its default value
  • Updated selectedItem to the newly selected item
  • Clear the CurrentBackgroundColor by setting it to null. This will allow the selection highlight to be shown

If you were after a more elegant solution I would look into EventTriggers

Upvotes: 0

brunnerh
brunnerh

Reputation: 185553

You could refrain from directly binding the Background to instead assign a Style to the TextBlock which uses a DataTrigger on the selection ({Binding IsSelected, RelativeSource={RelativeSource AncestorType=DataGridRow}}) being false and only then sets the Background to the binding.

Upvotes: 1

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