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MID Profile: Class Displayable
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SUMMARY: INNER | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD>
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javax.microedition.lcdui</FONT>
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Class Displayable</H2>
<PRE>
<A HREF="../../../java/lang/Object.html">java.lang.Object</A>
|
+--<B>javax.microedition.lcdui.Displayable</B>
</PRE>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../javax/microedition/lcdui/Canvas.html">Canvas</A>, <A HREF="../../../javax/microedition/lcdui/Screen.html">Screen</A></DD>
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<DT>public abstract class <B>Displayable</B><DT>extends <A HREF="../../../java/lang/Object.html">Object</A></DL>
<P>
An object that has the capability of being placed on the display. A <code>Displayable</code> object may have a title, a ticker, zero or more commands and a listener associated with it. The contents displayed and their interaction with the user are defined by subclasses. <p>The title string may contain <A HREF="Form.html#linebreak">line breaks</a>. The display of the title string must break accordingly. For example, if only a single line is available for a title and the string contains a line break then only the characters up to the line break are displayed.</p> <p>Unless otherwise specified by a subclass, the default state of newly created <code>Displayable</code> objects is as follows:</p> <ul> <li>it is not visible on the <code>Display</code>;</li> <li>there is no <code>Ticker</code> associated with this <code>Displayable</code>;</li> <li>the title is <code>null</code>;</li> <li>there are no <code>Commands</code> present; and</li> <li>there is no <code>CommandListener</code> present.</li> </ul>
<P>
<DL>
<DT><B>Since: </B><DD>MIDP 1.0</DD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/lcdui/Displayable.html#addCommand(javax.microedition.lcdui.Command)">addCommand</A></B>(<A HREF="../../../javax/microedition/lcdui/Command.html">Command</A> cmd)</CODE>
<BR>
Adds a command to the <code>Displayable</code>.</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/lcdui/Displayable.html#getHeight()">getHeight</A></B>()</CODE>
<BR>
Gets the height in pixels of the displayable area available to the application.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../javax/microedition/lcdui/Ticker.html">Ticker</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/lcdui/Displayable.html#getTicker()">getTicker</A></B>()</CODE>
<BR>
Gets the ticker used by this <code>Displayable</code>.</TD>
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<CODE> <A HREF="../../../java/lang/String.html">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/lcdui/Displayable.html#getTitle()">getTitle</A></B>()</CODE>
<BR>
Gets the title of the <code>Displayable</code>.</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/lcdui/Displayable.html#getWidth()">getWidth</A></B>()</CODE>
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Gets the width in pixels of the displayable area available to the application.</TD>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/lcdui/Displayable.html#isShown()">isShown</A></B>()</CODE>
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Checks if the <code>Displayable</code> is actually visible on the display.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/lcdui/Displayable.html#removeCommand(javax.microedition.lcdui.Command)">removeCommand</A></B>(<A HREF="../../../javax/microedition/lcdui/Command.html">Command</A> cmd)</CODE>
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Removes a command from the <code>Displayable</code>.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/lcdui/Displayable.html#setCommandListener(javax.microedition.lcdui.CommandListener)">setCommandListener</A></B>(<A HREF="../../../javax/microedition/lcdui/CommandListener.html">CommandListener</A> l)</CODE>
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Sets a listener for <A HREF="../../../javax/microedition/lcdui/Command.html"><CODE>Commands</CODE></A> to this <code>Displayable</code>, replacing any previous <code>CommandListener</code>.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/lcdui/Displayable.html#setTicker(javax.microedition.lcdui.Ticker)">setTicker</A></B>(<A HREF="../../../javax/microedition/lcdui/Ticker.html">Ticker</A> ticker)</CODE>
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Sets a ticker for use with this <code>Displayable</code>, replacing any previous ticker.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/lcdui/Displayable.html#setTitle(java.lang.String)">setTitle</A></B>(<A HREF="../../../java/lang/String.html">String</A> s)</CODE>
<BR>
Sets the title of the <code>Displayable</code>.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<CODE>protected void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/lcdui/Displayable.html#sizeChanged(int, int)">sizeChanged</A></B>(int w, int h)</CODE>
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The implementation calls this method when the available area of the <code>Displayable</code> has been changed.</TD>
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<TD><B>Methods inherited from class java.lang.<A HREF="../../../java/lang/Object.html">Object</A></B></TD>
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<TD><CODE><A HREF="../../../java/lang/Object.html#equals(java.lang.Object)">equals</A>, <A HREF="../../../java/lang/Object.html#getClass()">getClass</A>, <A HREF="../../../java/lang/Object.html#hashCode()">hashCode</A>, <A HREF="../../../java/lang/Object.html#notify()">notify</A>, <A HREF="../../../java/lang/Object.html#notifyAll()">notifyAll</A>, <A HREF="../../../java/lang/Object.html#toString()">toString</A>, <A HREF="../../../java/lang/Object.html#wait()">wait</A>, <A HREF="../../../java/lang/Object.html#wait(long)">wait</A>, <A HREF="../../../java/lang/Object.html#wait(long, int)">wait</A></CODE></TD>
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<B>Method Detail</B></FONT></TD>
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<A NAME="getTitle()"><!-- --></A><H3>
getTitle</H3>
<PRE>
public <A HREF="../../../java/lang/String.html">String</A> <B>getTitle</B>()</PRE>
<DL>
<DD>Gets the title of the <code>Displayable</code>. Returns <code>null</code> if there is no title.<DD><DL>
<DT><B>Returns:</B><DD>the title of the instance, or <code>null</code> if no title<DT><B>Since: </B><DD>MIDP 2.0</DD>
<DT><B>See Also: </B><DD><A HREF="../../../javax/microedition/lcdui/Displayable.html#setTitle(java.lang.String)"><CODE>setTitle(java.lang.String)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="setTitle(java.lang.String)"><!-- --></A><H3>
setTitle</H3>
<PRE>
public void <B>setTitle</B>(<A HREF="../../../java/lang/String.html">String</A> s)</PRE>
<DL>
<DD>Sets the title of the <code>Displayable</code>. If <code>null</code> is given, removes the title. <P>If the <code>Displayable</code> is actually visible on the display, the implementation should update the display as soon as it is feasible to do so.</P> <P>The existence of a title may affect the size⌨️ 快捷键说明
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