Hi Jose,
First, thanks for helping me out. Friday afternoons are tough, so no worries
;)
I'll create a clean little sample to illustrate what I'm trying to do. This
is either a common problem, or I'm approaching this from the wrong angle ;)
I wan't to trigger animations based on property changes on my data bound
object (datacontext). In order to programatically trigger the animations I
need to hook the PropertyChanged event, and in order to do that I tried to
create a dependency property and bind it the same way I bind the data
context. When the dependency property changed callback is executed I invoke
an animation, but "nothing happens".
I'll send a new post later today with a simple isolated sample :P
Have a GREAT weekend!
cheers,
Jonas
On Fri, May 2, 2008 at 5:21 PM, Jose Fajardo <[EMAIL PROTECTED]>
wrote:
>
> Hey mate,
>
>
> I understood most of what you're trying to do, it's the fact that
> it's Friday and
> my brain is completely fried that I can't work out why it's not working
> for ya.
>
>
> Correct me if im wrong here BUT what your saying is that the newly
> created dependency
> property is not being triggered when an animation runs.. Correct?
>
>
> If so what triggers this animation, what is it that is actually
> calling the animation
> in the first place ?
>
>
> Regards Jose
>
>
>
>
> =======================================
>
>
>
>
> Hi Jose,
>
> And thanks for the link. I have implemented the INotifyPropertyChanged
> event on
> my bussiness object SilverlightOrder.
>
> This is the problem:
>
> 1) I have a list of orders: List
> 2) I set the list as the DataContext on a ListView control
> 3) The ListView control creates one user control for each SilverlightOrder
> object,
> and passes on the SilverlightOrder object to the user controls DataContext
> property
>
> 4) Inside the user control I wan't to listen to the PropertyChanged event
> on the
> SilverlightOrder objekt. How ever, since I can't override the DataContext
> property
> on my user control, I don't get access to the SilverlightOrder object in
> order to
> hook up the event...
>
>
> I tried making a DependencyProperty on my user control called order like
> this:
>
>
> public static readonly DependencyProperty OrderProperty =
> DependencyProperty.Register("Order", typeof(SilverlightOrder),
> typeof(OrderStatusLine),
> new PropertyChangedCallback(DepCallback));
>
>
>
> And then bind it the same way I bind the DataContext property:
>
>
>
> The DepCallback method do execute, but if I run an animation on the
> control (which
> get's passed as the DependencyObject property) nothing happens... It's
> allmost like
> I change the state "to early"...?
>
>
> public static void DepCallback(DependencyObject obj,
> DependencyPropertyChangedEventArgs
> e)
> {
> ((OrderStatusLine)obj).SetInitialStateBasedOnData();
> }
>
>
> So, yeah, I deffenetly wan't to hook the PropertyChanged event of my data
> bound
> object and run animations based on any changes... But, I haven't figured
> out how
> to hook the event up.. :P
>
>
> cheers,
> Jonas
>
>
>
> On Fri, May 2, 2008 at 3:58 PM, Jose Fajardo < [mailto:
> [EMAIL PROTECTED]@liquidlounge.com.au
> >wrote:
>
> What your asking for is a perfect candidate for dependency properties :)
>
>
>
> When you create properties on a class you have the choice to make them
> ordinary
>
> properties or a dependency property (introduced in Silverlight 2.0 and
> previously
>
> existing in WPF).
>
>
>
> The reason you would want to make a property into a dependency property is
> so that
>
> it can be databound to (as your probably aware of)
>
>
>
> In the case of wanting to listen to a property if it changes you would
> want to
>
> implement the INotifyPropertyChanged class...
>
>
>
> The following like is a good post to explain databinding , it talks about
> binding
>
> ways, value converters, property changed notifications etc..
>
>
> Read it and let me know if your still confused
>
>
>
> [ [
> http://www.u2u.info/Blogs/Peter/Lists/Posts/Post.aspx?ID=271%5Dhttp://www.u2u.info/Blogs/Peter/Lists/Posts/Post.aspx?ID=271
> ]
>
> http://www.u2u.info/Blogs/Peter/Lists/Posts/Post.aspx?ID=271]http://www.u2u.info/Blogs/Peter/Lists/Posts/Post.aspx?ID=271<http://www.u2u.info/Blogs/Peter/Lists/Posts/Post.aspx?ID=271%5Dhttp://www.u2u.info/Blogs/Peter/Lists/Posts/Post.aspx?ID=271>
>
>
>
>
>
>
>
>
>
> ===============================================
>
>
>
> Hmm..
>
>
> Nope, dont' have any depdenceny properties in my project...
>
>
> Btw: Have another data binding question:
>
>
> I wan't to trigger an animation when a property on the databound object
> changes.
>
> Since we dont have triggers I have to do this in code, but I can't find a
> way to
>
> "hook" the event to the DataContext object...
>
>
>
> So, when ever a property on my data context object changes I wan't to run
> code to
>
> check if I need to run any animations...
>
>
> Any suggestions?
>
>
> Can't find a "ondatabinding" or "ondatacontextchanged" event to hook it
> up...
>
>
>
>
>
>
> On Fri, May 2, 2008 at 12:20 PM, Jose Fajardo <[mailto: [mailto:
> [EMAIL PROTECTED]
> [EMAIL PROTECTED] ] [mailto:[EMAIL PROTECTED]
> [EMAIL PROTECTED]
>
> >wrote:
>
>
> It sounds suspiciously related to dependency objects.. Does your
> usercontrols implement
>
>
> it's bindable properties as dependency properties?
>
>
>
>
>
>
> =====================================================
>
>
>
>
> I'm doing some Silverlight databinding, and get a strange message in the
> Output
>
>
> window when running in debug mode:
>
>
>
>
> BINDING: Can't convert type myFosters.SilverlightOrder to type
> System.Windows.DOWrapper
>
>
>
> BINDING: Can't convert type myFosters.SilverlightOrder to type
> System.Windows.DOWrapper
>
>
> BINDING: Can't convert type myFosters.SilverlightOrder to type
> System.Windows.DOWrapper
>
>
> BINDING: Can't convert type myFosters.SilverlightOrder to type
> System.Windows.DOWrapper
>
>
>
>
>
>
>
>
>
>
>
>
> So basically I create a custom control for each SilverlightOrder and bind
> it...
>
>
>
> I tried googeling for System.Windows.DOWrapper - No hits...
>
>
>
>
> Any ideas?
>
>
>
> The app runs fine, and I can bind to properties on the SilverlightOrder
> object inside
>
>
> the OrderStatusLine control, but I still want to figure out what that
> message means.
>
>
>
> cheers,
>
>
> Jonas
>
>
>
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