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SVN-BASE
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Overview
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<B>See:</B>
<BR>
<A HREF="#overview_description"><B>Description</B></A>
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<B>Packages</B></FONT></TH>
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<TD WIDTH="20%"><B><A HREF="com/sun/lwuit/package-summary.html">com.sun.lwuit</A></B></TD>
<TD>
Main widget package containing the component/container "composite" similar
both in terminology and design to Swing/AWT.</TD>
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<TD WIDTH="20%"><B><A HREF="com/sun/lwuit/animations/package-summary.html">com.sun.lwuit.animations</A></B></TD>
<TD>All components are animatable by potential and additional animations (unrelated to a specifc component) can be installed on the fly, transitions between forms are also handled as part of this package.</TD>
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<TD WIDTH="20%"><B><A HREF="com/sun/lwuit/events/package-summary.html">com.sun.lwuit.events</A></B></TD>
<TD> Observable pattern event listeners in the spirit of AWT 1.1's event dispatching architecture, all events are dispatched on the EDT (Event Dispatch Thread).</TD>
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<TD WIDTH="20%"><B><A HREF="com/sun/lwuit/geom/package-summary.html">com.sun.lwuit.geom</A></B></TD>
<TD> Contains classes related to geometry locations and calculations such as rectangle and size</TD>
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<TD WIDTH="20%"><B><A HREF="com/sun/lwuit/layouts/package-summary.html">com.sun.lwuit.layouts</A></B></TD>
<TD> Layout managers allow a <A HREF="com/sun/lwuit/Container.html" title="class in com.sun.lwuit"><CODE>Container</CODE></A> to arrange its components by a set of rules that would be adapted for specific screen/font sizes.</TD>
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<TD WIDTH="20%"><B><A HREF="com/sun/lwuit/list/package-summary.html">com.sun.lwuit.list</A></B></TD>
<TD> Lists are highly customizable and serve as the basis for <A HREF="com/sun/lwuit/ComboBox.html" title="class in com.sun.lwuit"><CODE>ComboBox</CODE></A> and other components (such as carousels etc) they employ a similar MVC approach to Swing including the renderer pattern.</TD>
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<TD WIDTH="20%"><B><A HREF="com/sun/lwuit/painter/package-summary.html">com.sun.lwuit.painter</A></B></TD>
<TD> <A HREF="com/sun/lwuit/Painter.html" title="interface in com.sun.lwuit"><CODE>Painter</CODE></A> allows us to draw arbitrary elements of graphics from plain/scaled/tiled images to gradients and pretty much any form of graphic drawing we can imagin.</TD>
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<TD WIDTH="20%"><B><A HREF="com/sun/lwuit/plaf/package-summary.html">com.sun.lwuit.plaf</A></B></TD>
<TD> Look of the application can be fully customized via this package, it represents a rendering layer that can be plugged in separately in runtime and themed to provide any custom look.</TD>
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<TD WIDTH="20%"><B><A HREF="com/sun/lwuit/util/package-summary.html">com.sun.lwuit.util</A></B></TD>
<TD> Utility features that are either too domain specific or don't "fit" into any other packages.</TD>
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<A NAME="overview_description"><!-- --></A>
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<H2>Overview</H2>
<P>The LightWeight User Interface Toolkit library (LWUIT) is inspired
by Swing but designed for constrained devices such as mobile phones
and set top boxes. LWUIT supports pluggable theme-ability, <A HREF="com/sun/lwuit/Component.html" title="class in com.sun.lwuit"><CODE>Component</CODE></A>/<A HREF="com/sun/lwuit/Container.html" title="class in com.sun.lwuit"><CODE>Container</CODE></A> hierarchy
and abstraction of underlying GUI toolkit.
</P>
<P>Interfaces and API's of the underlying profile are abstracted by
internal toolkit interfaces and abstract classes. This allows
portability and a migration path for both current and future devices
and profiles. E.g. the graphics object of the underlying profile
would be encapsulated by <A HREF="com/sun/lwuit/Graphics.html" title="class in com.sun.lwuit"><CODE>Graphics</CODE></A>.
</P>
<P>The toolkit tries to avoid the "lowest common denominator"
mentality by implementing some missing features in the lower end
platforms and taking better advantage of higher end platforms.
</P>
<P>Partial class diagram:<BR><IMG SRC="classes.png" NAME="graphics1" ALIGN=BOTTOM WIDTH=1240 HEIGHT=498 BORDER=0>
</P>
<H3>Hello World Example</H3>
<P>Following is a simple hello world example written on top of MIDP,
all the LWUITcode is 100% binary compatible to other platforms such
as CDC. However, this example is specific for MIDP for AMS
requirements a MIDlet class must exist for MIDP where in a CDC
environment an Xlet would be expected (in Java SE we would expect a
main class etc...).
</P>
<PRE><B>public</B> <B>class</B> <FONT COLOR="#2040a0">HiMidlet</FONT> <B>extends</B> <FONT COLOR="#2040a0">MIDlet</FONT> <B><FONT COLOR="#4444ff">{</FONT></B>
<B>public</B> <B>void</B> <FONT COLOR="#2040a0">startApp</FONT><B><FONT COLOR="#4444ff">()</FONT></B> <B><FONT COLOR="#4444ff">{</FONT></B>
<FONT COLOR="#2040a0">Display</FONT>.<FONT COLOR="#2040a0">init</FONT><B><FONT COLOR="#4444ff">(</FONT>this<FONT COLOR="#4444ff">)</FONT></B><FONT COLOR="#4444ff">;</FONT>
<FONT COLOR="#2040a0">Form</FONT> <FONT COLOR="#2040a0">f</FONT> <FONT COLOR="#4444ff">=</FONT> <FONT COLOR="#2040a0">new Form</FONT><FONT COLOR="#4444ff"><B>()</B>;</FONT>
<FONT COLOR="#2040a0">f</FONT>.<FONT COLOR="#2040a0">setTitle</FONT><B><FONT COLOR="#4444ff">(</FONT></B><FONT COLOR="#008000">"Hello World"</FONT><FONT COLOR="#4444ff"><B>)</B>;</FONT>
<FONT COLOR="#2040a0">f</FONT>.<FONT COLOR="#2040a0">setLayout</FONT><B><FONT COLOR="#4444ff">(</FONT>new</B> <FONT COLOR="#2040a0">BorderLayout</FONT><FONT COLOR="#4444ff"><B>())</B>;</FONT>
<FONT COLOR="#2040a0">f</FONT>.<FONT COLOR="#2040a0">add</FONT><B><FONT COLOR="#4444ff">(</FONT></B><FONT COLOR="#008000">"Center"</FONT>, <B>new</B> <FONT COLOR="#2040a0">Label</FONT><B><FONT COLOR="#4444ff">(</FONT></B><FONT COLOR="#008000">"Hello Label"</FONT><FONT COLOR="#4444ff"><B>))</B>;</FONT>
<FONT COLOR="#2040a0">f</FONT>.<FONT COLOR="#2040a0">show</FONT><FONT COLOR="#4444ff"><B>()</B>;</FONT>
<B><FONT COLOR="#4444ff">}</FONT></B>
<B>public</B> <B>void</B> <FONT COLOR="#2040a0">pauseApp</FONT><B><FONT COLOR="#4444ff">()</FONT></B> <B><FONT COLOR="#4444ff">{</FONT></B>
<B><FONT COLOR="#4444ff">}</FONT></B>
<B>public</B> <B>void</B> <FONT COLOR="#2040a0">destroyApp</FONT><B><FONT COLOR="#4444ff">(</FONT>boolean</B> <FONT COLOR="#2040a0">unconditional</FONT><B><FONT COLOR="#4444ff">)</FONT></B> <B><FONT COLOR="#4444ff">{</FONT></B>
<B><FONT COLOR="#4444ff">}</FONT></B>
<FONT COLOR="#4444ff"><B>}</B></FONT>
</PRE><P>
Notice in the example above that the very first line of code for any
application using this toolkit must register the main class with the
display. This behavior is toolkit specific since in MIDP there is not
much you can do without a reference to the parent MIDlet this
operation must be performed in the beginning of the application.
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