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Themes on the Web in Software Display UPC-A Supplement 2 in Software Themes on the Web




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Themes on the Web use software upc-a supplement 5 integrated toassign upc symbol on software RM4SCC User inter GTIN - 12 for None faces built for Web applications don"t share the same flexibility as those built for the desktop. There is really no limitation that says we can"t build themes that are portable enough to work with more than one application in a web browser. The underlying functionality that gives the desktop applications their look and feel isn"t very different from that of a web application.

. 1 . We can dra Software UPC-A stically alter the look and feel of a web application with styles. Style can be applied to a single HTML element or a range of elements. We have the flexibility to pick and choose which elements we change.

With HTML, there are a variety of ways to achieve the same visual result. For instance, creating portable themes that work across applications. If there was a consistent structure we could apply style to, themes become much simpler to develop, and keep portable.

As with the desktop environment, widgets are used in a web environment to make user interfaces themeable.. What are widgets Before we UPC A for None start creating our own widgets and styling them, let"s take a moment to discuss what widgets actually are. A widget, in the user interface sense, is a portion of anything displayed on the screen. Widgets can be large and complex, or small and simplistic.

They usually have at least some structural element that is defined by the developer. A block of text isn"t a widget; the developer doesn"t specify the shape of each character. Understanding what widgets are and how they relate to themes is important for building themeable user interfaces.

For example, the date picker widget solves a common problem allowing the user to select a date. Themes control how the date picker looks..

Widget structure Widgets ar Software UCC - 12 en"t just a single, opaque whole. jQuery UI widgets are structured as assemblies of parts. For instance, below is an equalizer widget.

You can see it is made up of several components the header, and individual sliders for controlling the widget:. Equalizer Themeable User Interfaces So what ar e the individual parts that make up a widget Is there a predefined set of fields that a user interface component must have in order to be considered a widget There are no qualifying attributes that make something a widget. The fields that define a widget structure are up to the widget creator. They can have a single field and the widget does the rest, or, they can have dozens of fields that allow for a lot of flexibility and are harder to use.

Widgets can contain other widgets. These subordinate widgets can contain others, and so on. We can continue down this path, moving ever further down the ladder until we finally reach the lowest level HTML element.

In practice, however, we don"t want a complex widget structure that is difficult to style.. Widgets and themes So how doe s the structure of a widget, or widgets in general for that matter, relate to themes Applying a style to a standard HTML element is easy to do. However, in order to share themes, to make them portable, we need to share structure. Theme authors don"t design themes for one specific application.

They"re intended to be used and reused with different applications. The same idea is true for widgets, jQuery UI widgets, Dojo widgets, and so on; they"re all intended for reuse. Portability is an important attribute of widgets.

Applying styles to widgets, changing their look and feel, isn"t all that different from styling plain old HTML elements. The difference is that the consistency with which the styles are applied to widgets remains the same across applications..

Styling user interfaces Creating s tyles that change the look and feel of web application is the reason CSS exists. The many presentation properties that define a style are stored in a style sheet, separate from the structural elements of the user interface. We could directly apply styles to the element as a style attribute.

By doing this, we lose all portability; the style is forever bound to the element. There is more to defining the look and feel of your application when it comes to styling user interfaces. A big part of style creation is structuring your CSS in such a way that they aren"t restrictive.

Let"s take a closer look at what is involved with styling user interfaces..
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