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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Migrating from GnomeHRef to GtkLinkButton: GTK+ 2 Reference Manual</title>
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<div class="chapter">
<div class="titlepage"><div><div><h2 class="title">
<a name="gtk-migrating-GtkLinkButton"></a>Migrating from GnomeHRef to GtkLinkButton</h2></div></div></div>
<p>
    Since version 2.10, GTK+ provides the <a class="link" href="GtkLinkButton.html" title="GtkLinkButton"><span class="type">GtkLinkButton</span></a> widget as a
    replacement for the <span class="structname">GnomeHRef</span> widget
    in the libgnomeui library.
  </p>
<p>
    Porting an application from <span class="structname">GnomeHRef</span> to
    <a class="link" href="GtkLinkButton.html" title="GtkLinkButton"><span class="type">GtkLinkButton</span></a> is very simple. <a class="link" href="GtkLinkButton.html" title="GtkLinkButton"><span class="type">GtkLinkButton</span></a> does not have a
    default action for <a class="link" href="GtkButton.html#GtkButton-clicked" title="The “clicked” signal"><span class="type">“clicked”</span></a> signal. So instead of simply 
    creating the widget
    </p>
<div class="informalexample">
  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
    <tbody>
      <tr>
        <td class="listing_lines" align="right"><pre>1
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        <td class="listing_code"><pre class="programlisting"><span class="n">GtkWidget</span> <span class="o">*</span><span class="n">button</span><span class="p">;</span>

<span class="n">button</span> <span class="o">=</span> <span class="n">gnome_href_new</span> <span class="p">(</span><span class="n">url</span><span class="p">,</span> <span class="s">&quot;&quot;</span><span class="p">);</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>

<p>
    you will have to handle the activation of the <a class="link" href="GtkLinkButton.html" title="GtkLinkButton"><span class="type">GtkLinkButton</span></a>, using
    the ::clicked signal for instance
    </p>
<div class="informalexample">
  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
    <tbody>
      <tr>
        <td class="listing_lines" align="right"><pre>1
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17</pre></td>
        <td class="listing_code"><pre class="programlisting"><span class="k">static</span> <span class="kt">void</span>
<span class="nf">link_button_clicked_cb</span> <span class="p">(</span><span class="n">GtkWidget</span> <span class="o">*</span><span class="n">widget</span><span class="p">,</span>
                        <span class="n">gpointer</span>   <span class="n">data</span><span class="p">)</span>
<span class="p">{</span>
  <span class="k">const</span> <span class="n">gchar</span> <span class="o">*</span><span class="n">link</span><span class="p">;</span>

	<span class="n">link</span> <span class="o">=</span> <span class="n">gtk_link_button_get_uri</span> <span class="p">(</span><span class="n">GTK_LINK_BUTTON</span> <span class="p">(</span><span class="n">widget</span><span class="p">));</span>
	<span class="n">open_browser_at_url</span> <span class="p">(</span><span class="n">link</span><span class="p">);</span>
<span class="p">}</span>

<span class="cm">/* ... */</span>

  <span class="n">GtkWidget</span> <span class="o">*</span><span class="n">button</span><span class="p">;</span>

	<span class="n">button</span> <span class="o">=</span> <span class="n">gtk_link_button_new</span> <span class="p">(</span><span class="n">url</span><span class="p">);</span>
	<span class="n">g_signal_connect</span> <span class="p">(</span><span class="n">button</span><span class="p">,</span> <span class="s">&quot;clicked&quot;</span><span class="p">,</span>
	                  <span class="n">G_CALLBACK</span> <span class="p">(</span><span class="n">link_button_clicked_cb</span><span class="p">),</span> <span class="nb">NULL</span><span class="p">);</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>

<p>
    If you have more than one <a class="link" href="GtkLinkButton.html" title="GtkLinkButton"><span class="type">GtkLinkButton</span></a> instead of connecting
    a signal to each one, you can use a "hook function" which will be
    called whenever a user activates a link button
    </p>
<div class="informalexample">
  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
    <tbody>
      <tr>
        <td class="listing_lines" align="right"><pre>1
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        <td class="listing_code"><pre class="programlisting"><span class="k">static</span> <span class="kt">void</span>
<span class="nf">link_button_hook</span> <span class="p">(</span><span class="n">GtkLinkButton</span> <span class="o">*</span><span class="n">button</span><span class="p">,</span>
                  <span class="k">const</span> <span class="n">gchar</span>   <span class="o">*</span><span class="n">link</span><span class="p">,</span>
			<span class="n">gpointer</span>       <span class="n">user_data</span><span class="p">)</span>

<span class="p">{</span>
  <span class="n">open_browser_at_url</span> <span class="p">(</span><span class="n">link</span><span class="p">);</span>
<span class="p">}</span>

<span class="cm">/* ... */</span>

  <span class="n">GtkWidget</span> <span class="o">*</span><span class="n">button1</span> <span class="o">=</span> <span class="n">gtk_link_button_new</span> <span class="p">(</span><span class="n">uri1</span><span class="p">);</span>
	<span class="n">GtkWidget</span> <span class="o">*</span><span class="n">button2</span> <span class="o">=</span> <span class="n">gtk_link_button_new</span> <span class="p">(</span><span class="n">uri2</span><span class="p">);</span>

  <span class="n">gtk_link_button_set_uri_hook</span> <span class="p">(</span><span class="n">link_button_hook</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>

<p>

  </p>
<p>
    Starting with GTK+ 2.16, it is no longer necessary to set up a uri hook
    manually, since GTK+ now defaults to calling <a class="link" href="gtk2-Filesystem-utilities.html#gtk-show-uri" title="gtk_show_uri ()"><code class="function">gtk_show_uri()</code></a> if no uri
    hook has been set.
  </p>
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