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Dojo Mobile Themes

An application running on Android needn't (and probably shouldn't) look exactly the same as the

same application running on iOS. Both operating systems provide native "look and feels" which a

user has come to expect to see when working with an application on a particular OS. Dojo Mobile

provides the capability for the same developed application to appear/look like a "native"

application. To do this, it needs to change the appearance of the widgets depending on whether

they are running on one OS or another. This concept is generally termed "themeing". Dojo

supplies themes for Android and iOS.

The View Model

When we work with applications in the desktop environment, we are familiar with the notion of

new windows appearing as we navigate from one part of an application to another. In the mobile

platform, this may not be possible because of limited screen space and, even when screen space is

available, the notion of a "window" is alien.

The architecture of Dojo Mobile is that we have "views" which correspond to a full screen of data.

When a Dojo view is added it consumes all the available space. A page can have multiple views

but only one view is ever visible at a time. What we wish to do is to present a view and then allow

the user to navigate between the views.

There are a number of types of views available including:

• dojox/mobile/View

• dojox/mobile/ScrollableView

• dojox/mobile/SwapView

When a view is shown or hidden, a set of events are fired associated with that view. We can

data in the views or other tasks in order to prepare the data for visualization or save data that was

previously entered.

We can register these with the Dojo "on" function which takes the format:

on(widget, event, function)

for example:

on(myView, "beforetransitionin", function(...) { … });

The events which can be connected are:

• onStartView – Called when the view is default

• onBeforeTransitionIn

• onAfterTransitionIn

• onBeforeTransitionOut

• onAfterTransitionOut

Note for use with the Dojo "on" function, the event names have the "on" prefix removed and are

lower-cased.

Views provide an explicitly callable method named "performTransition()" which performs

a view switch from one view to another. The parameters to this method are:

• moveTo – The name of the view that will be newly shown

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Servis-Rhino 4211B Betriebsanweisung Seite 228