daniel bigham.ca

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BB10: Images animating into place when loading QML file
June 28, 2012

I've noticed that when I load new QML files, the images animate into place.

For example, if the screen contains an image at position X,Y and it is of width W and height H, then the image becomes visible at coordinates 0,0 and has width 0 and height 0, and then animates into place by flying over to coordinates X,Y and growing to eventually be of width W and height H.

If I then click the "Back" button and go to that QML screen a second time, it doesn't animate.

Is this implicit animation intended? While implicit animations are rather amazing and a great tool to have, it seems counter intuitive to have screens use implicit animations when they are first loaded. It creates a rather unpleasant business and visual distraction when the screen is loading.

I thought I could disable this by adding the following to the ImageView controls:

                attachedObjects: [
                    ImplicitAnimationController {
                        enabled: false
                    }
                ]

... but they are still animating.

Posted question here

BB10: onTouch
June 28, 2012

To respond to a touch event, I added the following:

onTouch: {
navPane.deprecatedPushQmlByString ("mom_dad.qml");
}

To my amazement, when I ran the code on the dev alpha device and touched the image, it loaded mom_dad.qml five times!

This is because, I would assume, the onTouch event fires when your finger moves on the screen, and you need to limit your "click" event handler to the down event:

onTouch: {
    if (event.isDown()) {
        navPane.deprecatedPushQmlByString ("mom_dad.qml");
    }
}

BB10: Splash Screen / Page Load Event
June 25, 2012

Each time I've learned a new mobile platform, the first app I implement is my "Baby Names" app.

The first step is to implement the splash screen.

As I noted in an earlier post, this involved a custom timer control.

But to start the timer, I need a page loaded event, or something similar. I don't see that in the reference documentation for "Page".

Asked question:

http://supportforums.blackberry.com/t5/Cascades-Development/Page-load-event-in-QML/td-p/1783941

The answer is to use:

    onCreationCompleted: {
        splashTimer.start ();
    }

This signal is part of UIObject and inhereted by Page, which is why I didn't see it when I looked at the documentation for Page.

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