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QGraphicsView.ViewportUpdateMode
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com.trolltech.qt.gui</FONT>
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Enum QGraphicsView.ViewportUpdateMode</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by ">java.lang.Enum<<A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html" title="enum in com.trolltech.qt.gui">QGraphicsView.ViewportUpdateMode</A>>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.trolltech.qt.gui.QGraphicsView.ViewportUpdateMode</B>
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<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../com/trolltech/qt/QtEnumerator.html" title="interface in com.trolltech.qt">QtEnumerator</A>, java.io.Serializable, java.lang.Comparable<<A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html" title="enum in com.trolltech.qt.gui">QGraphicsView.ViewportUpdateMode</A>></DD>
</DL>
<DL>
<DT><B>Enclosing class:</B><DD><A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.html" title="class in com.trolltech.qt.gui">QGraphicsView</A></DD>
</DL>
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<DT><PRE>public static enum <B>QGraphicsView.ViewportUpdateMode</B><DT>extends java.lang.Enum<<A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html" title="enum in com.trolltech.qt.gui">QGraphicsView.ViewportUpdateMode</A>><DT>implements <A HREF="../../../../com/trolltech/qt/QtEnumerator.html" title="interface in com.trolltech.qt">QtEnumerator</A></DL>
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<P>
<p>This enum describes how <a href="QGraphicsView.html#QGraphicsView(com.trolltech.qt.gui.QGraphicsScene, com.trolltech.qt.gui.QWidget)"><tt>QGraphicsView</tt></a> updates its viewport when the scene contents change or are exposed.</p>
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<DT><B>See Also:</B><DD><a href="QGraphicsView.html#viewportUpdateMode()"><tt>viewportUpdateMode</tt></a></DL>
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<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html#FullViewportUpdate">FullViewportUpdate</A></B></CODE>
<BR>
When any visible part of the scene changes or is reexposed, <a href="QGraphicsView.html#QGraphicsView(com.trolltech.qt.gui.QGraphicsScene, com.trolltech.qt.gui.QWidget)"><tt>QGraphicsView</tt></a> will update the entire viewport.</TD>
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<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html#MinimalViewportUpdate">MinimalViewportUpdate</A></B></CODE>
<BR>
<a href="QGraphicsView.html#QGraphicsView(com.trolltech.qt.gui.QGraphicsScene, com.trolltech.qt.gui.QWidget)"><tt>QGraphicsView</tt></a> will determine the minimal viewport region that requires a redraw, minimizing the time spent drawing by avoiding a redraw of areas that have not changed.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html#NoViewportUpdate">NoViewportUpdate</A></B></CODE>
<BR>
<a href="QGraphicsView.html#QGraphicsView(com.trolltech.qt.gui.QGraphicsScene, com.trolltech.qt.gui.QWidget)"><tt>QGraphicsView</tt></a> will never update its viewport when the scene changes; the user is expected to control all updates.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html#SmartViewportUpdate">SmartViewportUpdate</A></B></CODE>
<BR>
<a href="QGraphicsView.html#QGraphicsView(com.trolltech.qt.gui.QGraphicsScene, com.trolltech.qt.gui.QWidget)"><tt>QGraphicsView</tt></a> will attempt to find an optimal update mode by analyzing the areas that require a redraw.</TD>
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<CODE>static <A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html" title="enum in com.trolltech.qt.gui">QGraphicsView.ViewportUpdateMode</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html#resolve(int)">resolve</A></B>(int value)</CODE>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html#value()">value</A></B>()</CODE>
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<CODE>static <A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html" title="enum in com.trolltech.qt.gui">QGraphicsView.ViewportUpdateMode</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html#valueOf(java.lang.String)">valueOf</A></B>(java.lang.String name)</CODE>
<BR>
Returns the enum constant of this type with the specified name.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html" title="enum in com.trolltech.qt.gui">QGraphicsView.ViewportUpdateMode</A>[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html#values()">values</A></B>()</CODE>
<BR>
Returns an array containing the constants of this enum type, in
the order they're declared.</TD>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Enum</B></TH>
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<A NAME="FullViewportUpdate"><!-- --></A><H3>
FullViewportUpdate</H3>
<PRE>
public static final <A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html" title="enum in com.trolltech.qt.gui">QGraphicsView.ViewportUpdateMode</A> <B>FullViewportUpdate</B></PRE>
<DL>
<DD><p>When any visible part of the scene changes or is reexposed, <a href="QGraphicsView.html#QGraphicsView(com.trolltech.qt.gui.QGraphicsScene, com.trolltech.qt.gui.QWidget)"><tt>QGraphicsView</tt></a> will update the entire viewport. This approach is fastest when <a href="QGraphicsView.html#QGraphicsView(com.trolltech.qt.gui.QGraphicsScene, com.trolltech.qt.gui.QWidget)"><tt>QGraphicsView</tt></a> spends more time figuring out what to draw than it would spend drawing (e.g., when very many small items are repeatedly updated). This is the preferred update mode for viewports that do not support partial updates, such as <a href="%2E%2E/opengl/QGLWidget.html"><tt>QGLWidget</tt></a>.</p>
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="MinimalViewportUpdate"><!-- --></A><H3>
MinimalViewportUpdate</H3>
<PRE>
public static final <A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html" title="enum in com.trolltech.qt.gui">QGraphicsView.ViewportUpdateMode</A> <B>MinimalViewportUpdate</B></PRE>
<DL>
<DD><p><a href="QGraphicsView.html#QGraphicsView(com.trolltech.qt.gui.QGraphicsScene, com.trolltech.qt.gui.QWidget)"><tt>QGraphicsView</tt></a> will determine the minimal viewport region that requires a redraw, minimizing the time spent drawing by avoiding a redraw of areas that have not changed. This is <a href="QGraphicsView.html#QGraphicsView(com.trolltech.qt.gui.QGraphicsScene, com.trolltech.qt.gui.QWidget)"><tt>QGraphicsView</tt></a>'s default mode. Although this approach provides the best performance in general, if there are many small visible changes on the scene, <a href="QGraphicsView.html#QGraphicsView(com.trolltech.qt.gui.QGraphicsScene, com.trolltech.qt.gui.QWidget)"><tt>QGraphicsView</tt></a> might end up spending more time finding the minimal approach than it will spend drawing.</p>
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="SmartViewportUpdate"><!-- --></A><H3>
SmartViewportUpdate</H3>
<PRE>
public static final <A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html" title="enum in com.trolltech.qt.gui">QGraphicsView.ViewportUpdateMode</A> <B>SmartViewportUpdate</B></PRE>
<DL>
<DD><p><a href="QGraphicsView.html#QGraphicsView(com.trolltech.qt.gui.QGraphicsScene, com.trolltech.qt.gui.QWidget)"><tt>QGraphicsView</tt></a> will attempt to find an optimal update mode by analyzing the areas that require a redraw.</p>
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="NoViewportUpdate"><!-- --></A><H3>
NoViewportUpdate</H3>
<PRE>
public static final <A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html" title="enum in com.trolltech.qt.gui">QGraphicsView.ViewportUpdateMode</A> <B>NoViewportUpdate</B></PRE>
<DL>
<DD><p><a href="QGraphicsView.html#QGraphicsView(com.trolltech.qt.gui.QGraphicsScene, com.trolltech.qt.gui.QWidget)"><tt>QGraphicsView</tt></a> will never update its viewport when the scene changes; the user is expected to control all updates. This mode disables all (potentially slow) item visibility testing in <a href="QGraphicsView.html#QGraphicsView(com.trolltech.qt.gui.QGraphicsScene, com.trolltech.qt.gui.QWidget)"><tt>QGraphicsView</tt></a>, and is suitable for scenes that either require a fixed frame rate, or where the viewport is otherwise updated externally.</p>
<P>
<DL>
</DL>
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<A NAME="values()"><!-- --></A><H3>
values</H3>
<PRE>
public static final <A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html" title="enum in com.trolltech.qt.gui">QGraphicsView.ViewportUpdateMode</A>[] <B>values</B>()</PRE>
<DL>
<DD>Returns an array containing the constants of this enum type, in
the order they're declared. This method may be used to iterate
over the constants as follows:
<pre>
for(QGraphicsView.ViewportUpdateMode c : QGraphicsView.ViewportUpdateMode.values())
System.out.println(c);
</pre>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>an array containing the constants of this enum type, in
the order they're declared</DL>
</DD>
</DL>
<HR>
<A NAME="valueOf(java.lang.String)"><!-- --></A><H3>
valueOf</H3>
<PRE>
public static <A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html" title="enum in com.trolltech.qt.gui">QGraphicsView.ViewportUpdateMode</A> <B>valueOf</B>(java.lang.String name)</PRE>
<DL>
<DD>Returns the enum constant of this type with the specified name.
The string must match <I>exactly</I> an identifier used to declare an
enum constant in this type. (Extraneous whitespace characters are
not permitted.)
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - the name of the enum constant to be returned.
<DT><B>Returns:</B><DD>the enum constant with the specified name
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if this enum type has no constant
with the specified name</DL>
</DD>
</DL>
<HR>
<A NAME="value()"><!-- --></A><H3>
value</H3>
<PRE>
public int <B>value</B>()</PRE>
<DL>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../com/trolltech/qt/QtEnumerator.html#value()">value</A></CODE> in interface <CODE><A HREF="../../../../com/trolltech/qt/QtEnumerator.html" title="interface in com.trolltech.qt">QtEnumerator</A></CODE></DL>
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<A NAME="resolve(int)"><!-- --></A><H3>
resolve</H3>
<PRE>
public static <A HREF="../../../../com/trolltech/qt/gui/QGraphicsView.ViewportUpdateMode.html" title="enum in com.trolltech.qt.gui">QGraphicsView.ViewportUpdateMode</A> <B>resolve</B>(int value)</PRE>
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