Vista - Target name cannot be found when animating storyboard programmatically

Hi there,

I've been trying out the WinFX stuff and have been running into major
problems trying to get a storyboard to animate.

Here is a code snippit. The Class that contains this code is inherited
from Canvas.

WPFPage::WPFPage(int width, int height) {
this->Height = height;
this->Width = width;
this->Background = gcnew SolidColorBrush(Colors::White);

// load bitmap images
BitmapImage^ bitmap1 = gcnew BitmapImage(gcnew Uri(
"C:\\Documents and Settings\\stan\\My Documents\\Visual Studio
2005\\Projects\\WindowsApplication1\\Images\\phoenixanimation501.bmp"));

// create onscreen images
Image^ image1 = gcnew Image();
image1->Name = "image1";
image1->Source = bitmap1;
image1->Width = 269;
Canvas::SetTop(image1, 100);
Canvas::SetLeft(image1, 10);
this->Children->Add(image1);

// create storyboard
storyboard = gcnew Storyboard();
storyboard->RepeatBehavior = RepeatBehavior::Forever;
storyboard->Name = "storyboard1";

// double animation using keyframes
DoubleAnimationUsingKeyFrames^ danim1 = gcnew
DoubleAnimationUsingKeyFrames();
storyboard->SetTargetName(danim1, image1->Name);
storyboard->SetTargetProperty(danim1, gcnew
PropertyPath(Image::OpacityProperty));

// keyframes
DiscreteDoubleKeyFrame^ kf1_1 = gcnew DiscreteDoubleKeyFrame();
kf1_1->Value = 1;
kf1_1->KeyTime = KeyTime::FromTimeSpan(TimeSpan(0, 0, 0, 0, 30));
DiscreteDoubleKeyFrame^ kf1_2 = gcnew DiscreteDoubleKeyFrame();
kf1_2->Value = 0;
kf1_2->KeyTime = KeyTime::FromTimeSpan(TimeSpan(0, 0, 0, 0, 180));

danim1->KeyFrames->Add(kf1_1);
danim1->KeyFrames->Add(kf1_2);

storyboard->Children->Add(danim1);

storyboard->Begin(this);

}

When I try to run this, Begin(this) causes the program to break and
complain about not being able to find "image1" which was set via the
TargetName method of Storyboard.

since "this"'s children does have the image added to it with the name
property set, why is the storyboard not able to find this?

Any help would be greatly appreciated!

Hmm, the plot thickens.

For fun, I added the following code to the program:

if(this->FindName("image1") == NULL) {
image1->Width = 400;
} else {
image1->Width = 100;
}

When I do this, I end up with a small image (pass condition). This
means that the object name does indeed exist in the canvas and WinFX
was able to find it via FindName.

If that is the case, why is the storyboard not able to find it?

Does anyone know if this is a bug or if I am doing something wrong?

When coding animationts I think you have to register the object you want to
animate using RegisterName method

http://windowssdk.msdn.microsoft.com...ee38cf79ea.asp

and read section Targeting Objects and Properties

Regards
Ranjit


<stanley_r_eisenberg@raytheon.com> wrote in message
news:1147644678.019333.267690@i39g2000cwa.googlegroups.com...
> Hmm, the plot thickens.
>
> For fun, I added the following code to the program:
>
> if(this->FindName("image1") == NULL) {
> image1->Width = 400;
> } else {
> image1->Width = 100;
> }
>
> When I do this, I end up with a small image (pass condition). This
> means that the object name does indeed exist in the canvas and WinFX
> was able to find it via FindName.
>
> If that is the case, why is the storyboard not able to find it?
>
> Does anyone know if this is a bug or if I am doing something wrong?
>

Thanks alot Ranj,

I'll give that a try tonight and will post updates on here.

I've been very impressed with WinFX so far, but this problem is the
main thing preventing me on using the tech in an upcoming project,
hopefully all goes well!

Hi Ranj,

Just tried the RegisterName method, but it didn't work.

I added the follow (the class inherits from Canvas):

this->RegisterName("image1", image1);

And I received the following error message:

An unhandled exception of type 'System.InvalidOperationException'
occurred in PresentationFramework.dll Additional information: No
NameScope found to register the Name 'image1'.

image1 is of type Image, perhaps this is a Freezable and doesn't have a
NameScope property or something?

you could try

NameScope.SetNameScope(this, new NameScope());

<stanley_r_eisenberg@raytheon.com> wrote in message
news:1147743158.513201.293960@u72g2000cwu.googlegroups.com...
> Hi Ranj,
>
> Just tried the RegisterName method, but it didn't work.
>
> I added the follow (the class inherits from Canvas):
>
> this->RegisterName("image1", image1);
>
> And I received the following error message:
>
> An unhandled exception of type 'System.InvalidOperationException'
> occurred in PresentationFramework.dll Additional information: No
> NameScope found to register the Name 'image1'.
>
> image1 is of type Image, perhaps this is a Freezable and doesn't have a
> NameScope property or something?
>

Ah, thanks Ranj, I didn't know I could do that!

I'll give that a try tonight, hopefully that does the trick... we've
got to be getting close! :-)

Thanks again!

Woot! Thanks Ranj, that did the trick!

Thanks again for the help, your knowledge of WinFX has surely made my
experience a lot more enjoyable! :-)