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com.motorola.lwt</FONT>
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Class Component</H2>
<PRE>
java.lang.Object
|
+--<B>com.motorola.lwt.Component</B>
</PRE>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../com/motorola/lwt/InteractableComponent.html">InteractableComponent</A>, <A HREF="../../../com/motorola/lwt/Slider.html">Slider</A>, <A HREF="../../../com/motorola/lwt/TextComponent.html">TextComponent</A></DD>
</DL>
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<DL>
<DT>public abstract class <B>Component</B><DT>extends java.lang.Object</DL>
<P>
The Component class is the abstract base class for all LWT components. Subclasses must implement methods to render the Component, provide preferred width and height, and optionally, to handle events.<br> <br> A Component is a single user interface entity that occupies a rectangular region of its parent ComponentScreen. A Component can be added once to a single screen. Attempts to re-add a Component will result in it first being removed from its current screen (which could be the screen that it is being added to). The location and size of a Component is determined by specifying where the left, right, top and bottom edges are located. The location of each edge can be specified using one of several schemes, including offsets relative to the preceding Component. By default, a Component will be set to its preferred size, and will be aligned with the left edge of the screen directly beneath the preceding Component. <br> <br> A Component must provide a paint method to render itself. The Graphics object passed to the Component's paint method is translated so that the origin is located at the upper left corner of the Component.<br> <br> If desired, a Component can respond to key and pointer events by overriding the appropriate methods (keyPressed, pointerDragged, etc.) In order to receive key event focus, a Component must have acceptsKeyFocus set to true, and it must be visible and enabled. Provided the parent screen is shown, the Component with key event focus will receive all key events. <hr> <b>MOTOROLA and the Stylized M Logo are registered trademarks of Motorola, Inc. Reg. U.S. Pat. & Tm. Off.<br> ⌨️ 快捷键说明
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