81 lines
6.7 KiB
HTML
81 lines
6.7 KiB
HTML
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<title>Parsing of custom resources: GTK+ 3 Reference Manual</title>
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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="gtk-migrating-GtkStyleContext-parsing"></a>Parsing of custom resources</h2></div></div></div>
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<p>
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As a consequence of the RC format going away, calling <a class="link" href="gtk3-Resource-Files.html#gtk-rc-parse" title="gtk_rc_parse ()"><code class="function">gtk_rc_parse()</code></a> or
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<a class="link" href="gtk3-Resource-Files.html#gtk-rc-parse-string" title="gtk_rc_parse_string ()"><code class="function">gtk_rc_parse_string()</code></a> won't have any effect on a widgets appearance.
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The way to replace these calls is using a custom <a class="link" href="GtkStyleProvider.html" title="GtkStyleProvider"><span class="type">GtkStyleProvider</span></a>,
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either for an individual widget through <a class="link" href="GtkStyleContext.html#gtk-style-context-add-provider" title="gtk_style_context_add_provider ()"><code class="function">gtk_style_context_add_provider()</code></a>
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or for all widgets on a screen through <a class="link" href="GtkStyleContext.html#gtk-style-context-add-provider-for-screen" title="gtk_style_context_add_provider_for_screen ()"><code class="function">gtk_style_context_add_provider_for_screen()</code></a>.
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Typically, the provider will be a <a class="link" href="GtkCssProvider.html" title="GtkCssProvider"><span class="type">GtkCssProvider</span></a>, which parse CSS
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information from a file or from a string.
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</p>
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<div class="example">
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<a name="id-1.6.4.8.3"></a><p class="title"><b>Example 49. Using a custom GtkStyleProvider</b></p>
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<div class="example-contents">
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<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
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<tbody>
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<tr>
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<td class="listing_lines" align="right"><pre>1
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13</pre></td>
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<td class="listing_code"><pre class="programlisting"><span class="usertype">GtkStyleContext</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">context</span><span class="symbol">;</span>
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<span class="usertype">GtkCssProvider</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">provider</span><span class="symbol">;</span>
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<span class="normal">context </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GtkWidget.html#gtk-widget-get-style-context">gtk_widget_get_style_context</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">widget</span><span class="symbol">);</span>
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<span class="normal">provider </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GtkCssProvider.html#gtk-css-provider-new">gtk_css_provider_new</a></span><span class="normal"> </span><span class="symbol">();</span>
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<span class="function"><a href="GtkCssProvider.html#gtk-css-provider-load-from-data">gtk_css_provider_load_from_data</a></span><span class="normal"> </span><span class="symbol">(</span><span class="function">GTK_CSS_PROVIDER</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">provider</span><span class="symbol">),</span>
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<span class="normal"> </span><span class="string">".frame1 {</span><span class="specialchar">\n</span><span class="string">"</span>
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<span class="normal"> </span><span class="string">" border-image: url('gradient1.png') 10 10 10 10 stretch;</span><span class="specialchar">\n</span><span class="string">"</span>
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<span class="normal"> </span><span class="string">"}</span><span class="specialchar">\n</span><span class="string">"</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">-</span><span class="number">1</span><span class="symbol">,</span><span class="normal"> NULL</span><span class="symbol">);</span>
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<span class="function"><a href="GtkStyleContext.html#gtk-style-context-add-provider">gtk_style_context_add_provider</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">context</span><span class="symbol">,</span>
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<span class="normal"> </span><span class="function">GTK_STYLE_PROVIDER</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">provider</span><span class="symbol">),</span>
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<span class="normal"> <a href="GtkStyleProvider.html#GTK-STYLE-PROVIDER-PRIORITY-APPLICATION:CAPS">GTK_STYLE_PROVIDER_PRIORITY_APPLICATION</a></span><span class="symbol">);</span>
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<span class="function">g_object_unref</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">provider</span><span class="symbol">);</span></pre></td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<br class="example-break"><p>
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Notice that you can also get style information from custom resources
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by implementing the <a class="link" href="GtkStyleProvider.html" title="GtkStyleProvider"><span class="type">GtkStyleProvider</span></a> interface yourself. This is
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an advanced feature that should be rarely used.
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</p>
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