| author | tasneems@symbian.org |
| Fri, 05 Mar 2010 19:31:41 -0800 | |
| changeset 230 | 7848c135d915 |
| permissions | -rw-r--r-- |
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7848c135d915
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<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
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<html lang="en" xml:lang="en"> |
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<head> |
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<meta content="text/html; charset=utf-8" http-equiv="Content-Type" /> |
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<meta name="copyright" content="(C) Copyright 2005" /> |
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<meta name="DC.rights.owner" content="(C) Copyright 2005" /> |
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<meta content="concept" name="DC.Type" /> |
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<meta name="DC.Title" content="Introduction to the WRTKit" /> |
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<meta scheme="URI" name="DC.Relation" content="WRTKit_Overview_of_the_WRTKit-GUID-14c414f6-a220-40b6-8614-df13141495ab.html" /> |
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<meta content="XHTML" name="DC.Format" /> |
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<meta content="GUID-DCF05457-F800-4F05-B284-A4E24AB8BE79" name="DC.Identifier" /> |
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<meta content="en" name="DC.Language" /> |
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<link href="commonltr.css" type="text/css" rel="stylesheet" /> |
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<title> |
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Introduction to the WRTKit</title> |
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</head> |
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<body id="GUID-DCF05457-F800-4F05-B284-A4E24AB8BE79"><a name="GUID-DCF05457-F800-4F05-B284-A4E24AB8BE79"><!-- --></a> |
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<h1 class="topictitle1"> |
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Introduction to the WRTKit</h1> |
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<div> |
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<p> |
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The S60 Web Runtime allows developers to use familiar web technologies like |
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HTML, CSS and JavaScript to create applications called "widgets" very easily. |
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But because widgets are based on web technologies they look and behave more like |
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web pages than S60 applications by default, which is not always desirable. |
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</p> |
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<p> |
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Web pages use a document metaphor where content can be laid out arbitrarily. |
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Interaction with the web page is based on using a mouse or other similar device |
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to place a pointer arrow on elements on the web page and activating them by |
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pressing a button. When the pointer is over some user interface element it is |
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said to be "hovering". The element that the pointer is hovering over is often |
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displayed in a distinct style to show that it could be activated if the mouse |
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button was pressed. |
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</p> |
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<p> |
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Mobile device applications, on the other hand, have limitations that make this |
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methapor less than ideal. The screen is small so discipline is needed to lay out |
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user interface elements in a way that is easy to understand for the user. The |
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physical controls on a mobile device are also not very suitable for moving |
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around a pointer arrow on the screen. Instead of having a pointer to select |
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elements the concept of "focus" is used. One of the elements on the screen is |
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considered selected and this selection can be moved between the user interface |
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elements using a 4-way controller. The element that is selected is said to be |
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"focused". Like for hovering, the focused element is displayed with a distinct |
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style to set it apart from other elements. This interaction method is called |
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"tab navigation" due to the fact that the tab key was originally used to move |
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the focus on PC computers. |
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</p> |
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<p> |
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The S60 Web Runtime supports both the pointer-based and tab-based interaction |
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modes so that you can choose the one that fits your widget best. But while |
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simple user interfaces are easy to implement in both modes, more sophisticated |
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application-like user interfaces can be quite tricky. Hover and focus must be |
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handled correctly and the hover and focus states must be displayed consistently |
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throughout the user interface. Different screen sizes as well as screen resizes |
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and rotations must be taken into account. User interface controls like buttons, |
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checkboxes and scrollbars must be able to take on a look that fits the overall |
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visual theme of the widget, for example that of a commercial brand. |
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</p> |
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<p> |
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The WRTKit is a complete library of JavaScript code, CSS style rules and |
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graphical elements that are required to implement the kind of sophisticated, |
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customizable, application-like user interfaces that are described above. It |
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gives widget developers an easy way to create high quality user interfaces |
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without having to worry about the problems that would otherwise plague their |
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widgets. |
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</p> |
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<p> |
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When the WRTKit is used in a widget, complex and fully featured user interfaces |
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can be created with just a few lines of JavaScript code. The WRTKit takes care |
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of generating all the HTML and CSS automatically behind the scenes. What's more, |
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the visual look of the user interfaces created by the WRTKit is controlled |
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entirely using CSS, allowing complete customization without touching any code. |
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WRTKit user interfaces also work in standards-compliant PC web browsers, |
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enabling rapid development and debugging using familiar web development tools. |
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</p> |
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<div class="fignone" id="GUID-DCF05457-F800-4F05-B284-A4E24AB8BE79__GUID-A4ECC4FA-F3CB-4BD3-8B41-501B77168B29"><a name="GUID-DCF05457-F800-4F05-B284-A4E24AB8BE79__GUID-A4ECC4FA-F3CB-4BD3-8B41-501B77168B29"><!-- --></a><span class="figcap">Figure 1. |
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WRTKit-based widget user interface</span> |
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<br /><img src="Travel_Companion_Main_Screenshot_1.png" /><br /> |
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</div> |
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</div> |
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<div> |
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<div class="familylinks"> |
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<div class="parentlink"><strong>Parent topic:</strong> <a href="WRTKit_Overview_of_the_WRTKit-GUID-14c414f6-a220-40b6-8614-df13141495ab.html">Overview of the WRTKit</a></div> |
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</div> |
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</div> |
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</body> |
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