Cascades does not take sides property links in all components

I believe that many elements found in the Cascades are poorly designed because they do not take sides QML property bindings. The worst example is the ActivityIndicator component that is not a race (or something similar named) property.

Let me show you an example, I'll start with a snippet of code that does not have the property running:

{ActivityIndicator}

ID: indicator

}

WebView {}

onLoadingChanged: {}

If (loading)

Indicator.Start)

} else {}

Indicator.Stop)

}

}

}

It is not declarative, it's imperative code. Now, let's take a look at the following example which shows how it would look like if the ActivityIndicator have had an ongoing execution property:

{ActivityIndicator}

running: webView.loading

}

WebView {}

ID: webView

}

Much cleaner, easier to read and completely declarative. You also get the dependencies between the components on the right. In the first example, the Web mode has a dependency to the ActivityIndicator which is completely false. In the last example, you see that this time, the ActivityIndicator has the addiction to the Web mode, which is OK because the ActivityIndicator has a dependency for Web display and not vice versa.

To make things even worse with ActivityIndicator-case, is that there is a function called isRunning which returns Boolean If the indicator is running or not. Why is it good?

There are a couple of other components that have similarities with the ActivityIndicator, such as the cursor and TextField. Would be my pleasure to clarify if you are interested.

Yes, we certainly do.

With the cursor, there are 2 valueChanged and valueChanging, events which provide 2 different functionality, so should not in this case for valueChanged to send a signal until after the slider has ceased to be changed because the value itself is not changed until the cursor was placed, valueChanging provides instant feedback. Introducing the necessary logic to see if the user has lifted a finger, left the area of cursor or otherwise ceased to move the cursor would certainly complicate the case.

The next point you have raised is very valid, but with the method used by Cascades, as described above, the value of the slider is defined not until after the cursor is moved and stopped. I suggest you connecting everything you see as strange behavior or unexpected in the Issue Tracker as a bug. We can step up to the development of review, this will allow developers also know that the behavior used by Cascades is not always what is expected, or exactly in line with QtQuick QML.

Kind regards

Tags: BlackBerry Developers

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