How to ensure an Item (row) is visible

[Daní]

I would like to know if is possible to ensure an item's visibility. That means to scroll the control and/or expand a group to ensure that an item in gridview is visible by the user.

Thanks

[Daní]

Hi

any word about this topic?

[Milan]

Hello Daní,

I have created two methods that should help you ensure an item is visible:

private void BrindIntoView(DataRecord record)
{
    this.ExpandAllParentGroups(record);

    this.Dispatcher.BeginInvoke( new Action(() =>
        this.RadGridView1.ItemsControl.BringDataItemIntoView(record.Data)));
}

private void ExpandAllParentGroups(Record record)
{
    var currentRecord = record;

    while (currentRecord.ParentGroup != null)
    {
        currentRecord.ParentGroup.IsExpanded = true;
        currentRecord = currentRecord.ParentGroup;
    }
}

The key method is BringIntoView - it will bring into view a given data record. You can get access to the grid's records by using RadGridView.Records collection or retrieve a record from a data item using RadGridView.FindRecord method.

Hope this helps.

Kind regards,
Milan
the Telerik team

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[Daní]

Thanks Milan,

It works great... but I'm getting a warning in Visual Studio about Record class is obsolete and will not be longer used.

[Rossen Hristov]

Hi Daní,

We will do our best to provide means (API) for doing the same thing when we obsolete the records API.

All the best,
Ross
the Telerik team

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[Daní]

Thanks Ross,

I'm sure you will.

[Jax]

With the new API, is there a replacement for:

DataGrid.SelectedRecord.ParentGroup.IsExpanded = true;

?

[Milan]

Hi Malcolm Jack,

In Q3 we will introduce several methods that will allow you to do that without using records. For example:

var group = this.gridView.FindGroupByItem(this.gridView.SelectedItem);
this.gridView.CollapseGroup(group);
// or
this.gridView.ExpandGroup(group);

If you such functionality is required in the current RadGirdView version (Q2 2009)  we could possibly introduce those methiods with one of our internal build releases.

Hope this information is helpful.

Kind regards,
Milan
the Telerik team

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[devster]

Using version: 2009 Q2

A related question, consider this scenario: 
- ShowGroupPanel set to false
- used a GroupDescriptor to define one grouping that cannot be modified by the user

Goal: expand (only) the first group when the data is loaded.

I tried doing this in the Grouping and Grouped events, but the parentgroups are not set at that time.

In which event is the parent group set of the first record?

[Milan]

Hi dev,

You can easily expand groups by using our ExpandGroup method:

public MainPage()
{
    InitializeComponent();

    this.playersGrid.ItemsSource = Club.GetPlayers();
    this.playersGrid.DataLoaded += new System.EventHandler<System.EventArgs>(playersGrid_DataLoaded);
}

void playersGrid_DataLoaded(object sender, System.EventArgs e)
{
    // expand the first group
    this.playersGrid.ExpandGroup(this.playersGrid.Items.Cast<IGroup>().First());
}

Hope this helps.

Regards,
Milan
the Telerik team

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[Jax]

Milan - I don't seem to see the "grid.FindGroupByItem()" in the new release.
Has this been implemented?

[Milan]

Hello Jax,

This functionality is implemented but unfortunately the class that contains the methods is still internal. We will try to make this helper class publicly available with our latest internal build this Friday.

For the time being you could use the file that I have attached to this post. Just add it to your project and you should be able to search for groups.

private void Button_Click(object sender, System.Windows.RoutedEventArgs e)
{
    var group = this.playersGrid.Items.OfType<IGroup>().FindGroupByItem(this.playersGrid.Items[0]);
}

Greetings,
Milan
the Telerik team

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