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gtk-migrating-GtkGrid.html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Migrating from other containers to GtkGrid: GTK+ 3 Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GTK+ 3 Reference Manual"> <link rel="up" href="migrating.html" title="Part V. Migrating from Previous Versions of GTK+"> <link rel="prev" href="gtk-migrating-smclient-GtkApplication.html" title="Migrating from EggSMClient to GtkApplication"> <link rel="next" href="ch30s02.html" title="GtkBox versus GtkGrid: sizing"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"></td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="migrating.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="gtk-migrating-smclient-GtkApplication.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="ch30s02.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="chapter"> <div class="titlepage"><div><div><h2 class="title"> <a name="gtk-migrating-GtkGrid"></a>Migrating from other containers to GtkGrid</h2></div></div></div> <div class="toc"><dl class="toc"> <dt><span class="section"><a href="gtk-migrating-GtkGrid.html#id-1.6.7.4">GtkBox versus GtkGrid: packing</a></span></dt> <dt><span class="section"><a href="ch30s02.html">GtkBox versus GtkGrid: sizing</a></span></dt> <dt><span class="section"><a href="ch30s03.html">GtkBox versus GtkGrid: spacing</a></span></dt> </dl></div> <p> <a class="link" href="GtkGrid.html" title="GtkGrid"><span class="type">GtkGrid</span></a> is an attempt to write a comprehensive, legacy-free, box-layout container that is flexible enough to replace <a class="link" href="GtkBox.html" title="GtkBox"><span class="type">GtkBox</span></a>, <a class="link" href="GtkTable.html" title="GtkTable"><span class="type">GtkTable</span></a> and the like. </p> <p> The layout model of GtkGrid is to arrange its children in rows and columns. This is done by assigning positions on a two-dimentions grid that stretches arbitrarily far in all directions. Children can span multiple rows or columns, too. </p> <div class="section"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="id-1.6.7.4"></a>GtkBox versus GtkGrid: packing</h2></div></div></div> <p> GtkBox works by arranging child widgets in a single line, either horizontally or vertically. It allows packing children from the beginning or end, using <a class="link" href="GtkBox.html#gtk-box-pack-start" title="gtk_box_pack_start ()"><code class="function">gtk_box_pack_start()</code></a> and <a class="link" href="GtkBox.html#gtk-box-pack-end" title="gtk_box_pack_end ()"><code class="function">gtk_box_pack_end()</code></a>. </p> <img src="box-packing.png"><div class="example"> <a name="id-1.6.7.4.4"></a><p class="title"><b>Example 53. A simple box</b></p> <div class="example-contents"> <pre class="programlisting"> box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0); gtk_box_pack_start (GTK_BOX (box), gtk_label_new ("One"), FALSE, FALSE, 0); gtk_box_pack_start (GTK_BOX (box), gtk_label_new ("Two"), FALSE, FALSE, 0); </pre> <p>This can be done with <a class="link" href="GtkGrid.html" title="GtkGrid"><span class="type">GtkGrid</span></a> as follows:</p> <pre class="programlisting"> grid = gtk_grid_new (); child1 = gtk_label_new ("One"); gtk_grid_attach (GTK_GRID (grid), child1, 0, 0, 1, 1); child2 = gtk_label_new ("Two"); gtk_grid_attach_next_to (GTK_GRID (grid), child2, child1, GTK_POS_RIGHT, 1, 1); </pre> <p> And similarly for <a class="link" href="GtkBox.html#gtk-box-pack-end" title="gtk_box_pack_end ()"><code class="function">gtk_box_pack_end()</code></a>. In that case, you would use <a class="link" href="gtk3-Standard-Enumerations.html#GTK-POS-LEFT:CAPS"><span class="type">GTK_POS_LEFT</span></a> to place the grid children from left to right. </p> <p> If you only need to pack children from the start, using <a class="link" href="GtkContainer.html#gtk-container-add" title="gtk_container_add ()"><code class="function">gtk_container_add()</code></a> is an even simpler alternative. GtkGrid places children added with <a class="link" href="GtkContainer.html#gtk-container-add" title="gtk_container_add ()"><code class="function">gtk_container_add()</code></a> in a single row or column according to its <a class="link" href="gtk3-Orientable.html#GtkOrientable--orientation" title="The “orientation” property"><span class="type">“orientation”</span></a>. </p> </div> </div> <br class="example-break"><p> One difference to keep in mind is that the gtk_box_pack_start/pack_end functions allow you to place an arbitrary number of children from either end without ever 'colliding in the middle'. With GtkGrid, you have to leave enough space between the two ends, if you want to combine packing from both ends towards the middle. In practice, this should be easy to avoid; and GtkGrid simply ignores entirely empty rows or columns for layout and spacing. </p> <p> On the other hand, GtkGrid is more flexible in that its grid extends indefinitively in both directions — there is no problem with using negative numbers for the grid positions. So, if you discover that you need to place a widget before your existing arrangement, you always can. </p> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>