CODEWITHSUNDEEP
c#silverlight
kereberos
kereberos

Reputation: 1293

Silverlight Layout Grid Child Controls

I am trying to set properties of buttons inside of a layout grid. The grid itself is dynamically generated and so are the buttons inside of the grid cells. Unfortunately I cannot reference anything by name in code.

I need to refernce the buttons based on the grid cell they are in. I tried using the following code.

 stackButton = (Button) (from buttons in rowGrid.Children
                          where Grid.GetColumn (buttons as FrameworkElement) == s.RoomCol
                          where Grid.GetRow (buttons as FrameworkElement) == s.RoomRow
                          select buttons).FirstOrDefault();

The "stackButton" control is a Button control. "s" is a custom control that holds coordinates for the button within the grid. I do not get any objects returned when that code executes. Any ideas how I can better execute this?

Upvotes: 1

Views: 655

Answers (1)

Kir
Kir

Reputation: 3052

Short answer:

Not without getting creative (see below). That's basically the only way because of how attached properties work.

Aside

Two things though... stylistically, instead of two where clauses, you can use && You can technically have two controls share the same row/column (in which case they are superimposed, so you may want to rethink "firstordefault"

Full answer: YES

If you wanted to get super clever, you could register your own attached dependency properties like: Grid.MyRow and Grid.MyColumn and give them an OnChanged handler, which would:

  • set the standard Grid.SetRow (or column)

  • add your control to a dictionary, keyed with row, column. ie: make your own class that has Row and Column, implement Equals, and GetHashCode, so you can do this:

    Dictionary _buttons = new Dictionary();

    OnChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e) { // snip _dict.Add(new GridKey(row, column), button); }

Then your lookup becomes a O(1) operation instead of O(n)

If you don't want to go the attached properties route, you can simply do the _dict.Add thing when you dynamically generate the grid. (when you do rowGrid.Children.Add(..))

If you can't do that, then you can have a method which iterates through the children once and adds them all to the dictionary, so that further lookups are O(1)

Upvotes: 1

Related Questions