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<a name="rhythmbox-rb-text-helpers"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="rhythmbox-rb-text-helpers.top_of_page"></a>rb-text-helpers</span></h2>
<p>rb-text-helpers — text direction (LTR/RTL) functions</p>
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<div class="refsynopsisdiv">
<a name="rhythmbox-rb-text-helpers.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="rhythmbox-rb-text-helpers.html#rb-text-direction-conflict" title="rb_text_direction_conflict ()">rb_text_direction_conflict</a> (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/pango/pango-Bidirectional-Text.html#PangoDirection"><span class="type">PangoDirection</span></a> dir1</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/pango/pango-Bidirectional-Text.html#PangoDirection"><span class="type">PangoDirection</span></a> dir2</code></em>);
<a href="/usr/share/gtk-doc/html/pango/pango-Bidirectional-Text.html#PangoDirection"><span class="returnvalue">PangoDirection</span></a> <a class="link" href="rhythmbox-rb-text-helpers.html#rb-text-common-direction" title="rb_text_common_direction ()">rb_text_common_direction</a> (<em class="parameter"><code>const <span class="type">char</span> *first</code></em>,
<em class="parameter"><code>...</code></em>);
<span class="returnvalue">char</span> * <a class="link" href="rhythmbox-rb-text-helpers.html#rb-text-cat" title="rb_text_cat ()">rb_text_cat</a> (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/pango/pango-Bidirectional-Text.html#PangoDirection"><span class="type">PangoDirection</span></a> base_dir</code></em>,
<em class="parameter"><code>...</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="rhythmbox-rb-text-helpers.description"></a><h2>Description</h2>
<p>
Provides some helper functions for constructing strings that
may include both left-to-right and right-to-left text.
</p>
</div>
<div class="refsect1">
<a name="rhythmbox-rb-text-helpers.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="rb-text-direction-conflict"></a><h3>rb_text_direction_conflict ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> rb_text_direction_conflict (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/pango/pango-Bidirectional-Text.html#PangoDirection"><span class="type">PangoDirection</span></a> dir1</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/pango/pango-Bidirectional-Text.html#PangoDirection"><span class="type">PangoDirection</span></a> dir2</code></em>);</pre>
<p>
Direction conflict here means the two directions are defined (non-neutral)
and they are different.
</p>
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<td><p><span class="term"><em class="parameter"><code>dir1</code></em> :</span></p></td>
<td>direction A</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dir2</code></em> :</span></p></td>
<td>direction B</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the two directions conflict.</td>
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</table></div>
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<hr>
<div class="refsect2">
<a name="rb-text-common-direction"></a><h3>rb_text_common_direction ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/pango/pango-Bidirectional-Text.html#PangoDirection"><span class="returnvalue">PangoDirection</span></a> rb_text_common_direction (<em class="parameter"><code>const <span class="type">char</span> *first</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
This functions checks the direction of all given strings and:
</p>
<p>
1. If all strings are direction neutral, returns <a href="/usr/share/gtk-doc/html/pango/pango-Bidirectional-Text.html#PANGO-DIRECTION-NEUTRAL:CAPS"><code class="literal">PANGO_DIRECTION_NEUTRAL</code></a>;
</p>
<p>
2. If all strings are either LTR or neutral, returns <a href="/usr/share/gtk-doc/html/pango/pango-Bidirectional-Text.html#PANGO-DIRECTION-LTR:CAPS"><code class="literal">PANGO_DIRECTION_LTR</code></a>;
</p>
<p>
3. If all strings are either RTL or neutral, returns <a href="/usr/share/gtk-doc/html/pango/pango-Bidirectional-Text.html#PANGO-DIRECTION-RTL:CAPS"><code class="literal">PANGO_DIRECTION_RTL</code></a>;
</p>
<p>
4. If at least one is RTL and one LTR, returns <a href="/usr/share/gtk-doc/html/pango/pango-Bidirectional-Text.html#PANGO-DIRECTION-NEUTRAL:CAPS"><code class="literal">PANGO_DIRECTION_NEUTRAL</code></a>.
</p>
<p>
Note: neutral (1) and mixed (4) are two very different situations,
they share a return code here only because they're the same for our
specific use.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
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<td><p><span class="term"><em class="parameter"><code>first</code></em> :</span></p></td>
<td>first string</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>rest of strings, terminated with <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>common direction of all strings, as defined above.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rb-text-cat"></a><h3>rb_text_cat ()</h3>
<pre class="programlisting"><span class="returnvalue">char</span> * rb_text_cat (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/pango/pango-Bidirectional-Text.html#PangoDirection"><span class="type">PangoDirection</span></a> base_dir</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
This function concatenates strings to a single string, preserving
each part's original direction (LTR or RTL) using unicode markup,
as detailed here: http://unicode.org/reports/tr9/.
</p>
<p>
It is called like this:
</p>
<p>
s = rb_text_cat(base_dir, str1, format1, ..., strN, formatN, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>)
</p>
<p>
Format is a printf format with exactly one %s. "%s" or "" will
insert the string as is.
</p>
<p>
Any string that is empty ("") will be skipped, its format must still be
passed.
</p>
<p>
A space is inserted between strings.
</p>
<p>
The algorithm:
</p>
<p>
1. Caller supplies the base direction of the result in base_dir.
</p>
<p>
2. Insert either LRM or RLM at the beginning of the string to set
its base direction, according to base_dir.
</p>
<p>
3. Find the direction of each string using pango.
</p>
<p>
4. For strings that have the same direction as the base direction,
just insert them in.
</p>
<p>
5. For strings that have the opposite direction than the base one,
insert them surrounded with embedding codes RLE/LRE .. PDF.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
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<tr>
<td><p><span class="term"><em class="parameter"><code>base_dir</code></em> :</span></p></td>
<td>direction of the result string.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>pairs of strings (content, format) terminated with <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new string containing the result.</td>
</tr>
</tbody>
</table></div>
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