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<a name="GUI-Development"></a>
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Next: <a href="System-Utilities.html#System-Utilities" accesskey="n" rel="next">System Utilities</a>, Previous: <a href="Object-Oriented-Programming.html#Object-Oriented-Programming" accesskey="p" rel="prev">Object Oriented Programming</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<a name="GUI-Development-1"></a>
<h2 class="chapter">35 GUI Development</h2>
<p>Octave is principally a batch or command-line language. However, it does
offer some features for constructing graphical interfaces that interact with
users.
</p>
<p>The GUI elements available are I/O dialogs, a progress bar, and UI elements
for plot windows. For example, rather than hardcoding a filename for output
results a script can open a dialog box and allow the user to choose a file.
Similarly, if a calculation is expected to take a long time a script can
display a progress bar. The various UI elements can be used to fully customize
the plot window with menubars, toolbars, context menus, pushbuttons, sliders,
etc.
</p>
<p>Several utility functions make it possible to store private data for use with
a GUI which will not pollute the user’s variable space.
</p>
<p>Finally, a program written in Octave might want to have long term storage of
preferences or state variables. This can be done with user-defined
preferences.
</p>
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<tr><td align="left" valign="top">• <a href="I_002fO-Dialogs.html#I_002fO-Dialogs" accesskey="1">I/O Dialogs</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="Progress-Bar.html#Progress-Bar" accesskey="2">Progress Bar</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="UI-Elements.html#UI-Elements" accesskey="3">UI Elements</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="GUI-Utility-Functions.html#GUI-Utility-Functions" accesskey="4">GUI Utility Functions</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="User_002dDefined-Preferences.html#User_002dDefined-Preferences" accesskey="5">User-Defined Preferences</a>:</td><td> </td><td align="left" valign="top">
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