Commit 742f3e32 authored by Jonathan Blandford's avatar Jonathan Blandford Committed by Jonathan Blandford

fix bugs in the code.

Mon Mar 25 11:31:41 2002  Jonathan Blandford  <jrb@redhat.com>

	* gtk/tree_widget.sgml: fix bugs in the code.
parent 7cc14762
Mon Mar 25 11:31:41 2002 Jonathan Blandford <jrb@redhat.com>
* gtk/tree_widget.sgml: fix bugs in the code.
2002-03-20 Cody Russell <cody@jhu.edu>
* gtk/tree_widget.sgml: Much expanded overview of the tree.
......
......@@ -102,11 +102,12 @@ gtk_tree_store_append (store, &iter, NULL); /* Acquire an iterator */
gtk_tree_store_set (store, &iter,
TITLE_COLUMN, "The Principle of Reason",
AUTHOR_COLUMN, "Martin Heidegger",
CHECKED_COLUMN, FALSE);
CHECKED_COLUMN, FALSE
-1);
]]></programlisting></informalexample>
<para>
Notice that the last argument is FALSE. This is always done because
Notice that the last argument is -1. This is always done because
this is a variable-argument function and it needs to know when to stop
processing arguments. It can be used to set the data in any or all
columns in a given row.
......@@ -126,33 +127,35 @@ gtk_tree_store_set (store, &iter1,
TITLE_COLUMN, "The Art of Computer Programming",
AUTHOR_COLUMN, "Donald E. Knuth",
CHECKED_COLUMN, FALSE,
NULL);
-1);
gtk_tree_store_append (store, &iter2, &iter1); /* Acquire a child iterator */
gtk_tree_store_set (store, &iter2,
TITLE_COLUMN, "Volume 1: Fundamental Algorithms",
NULL);
-1);
gtk_tree_store_append (store, &iter2, &iter1);
gtk_tree_store_set (store, &iter2,
TITLE_COLUMN, "Volume 2: Seminumerical Algorithms",
NULL);
-1);
gtk_tree_store_append (store, &iter2, &iter1);
gtk_tree_store_set (store, &iter2,
TITLE_COLUMN, "Volume 3: Sorting and Searching",
NULL);
-1);
]]></programlisting></informalexample>
</refsect1>
<refsect1>
<title>Creating the view component</title>
<para>
While there are two different models to choose from, there is only one
view widget to deal with. It works with either the list or the tree store.
Setting up a <link linkend="GtkTreeView">GtkTreeView</link> is not a
difficult matter. It needs a <link linkend="GtkTreeModel">GtkTreeModel</link>
to know where to retrieve its data from.
While there are several different models to choose from, there is
only one view widget to deal with. It works with either the list
or the tree store. Setting up a <link
linkend="GtkTreeView">GtkTreeView</link> is not a difficult
matter. It needs a <link
linkend="GtkTreeModel">GtkTreeModel</link> to know where to
retrieve its data from.
</para>
<informalexample><programlisting><![CDATA[
GtkWidget *tree;
......@@ -163,9 +166,26 @@ tree = gtk_tree_view_new_with_model (GTK_TREE_MODEL (store));
<refsect2>
<title>Columns and cell renderers</title>
<para>
Cell renderers are used to draw the data in the tree model in a certain way.
There are three cell renderers to choose from with GTK+ 2.0, but the
adventuresome hacker may write more.
Once the <link linkend="GtkTreeView">GtkTreeView</link> widget
has a model, it will need to know how to display the model. It
does this with columns and cell renderers.
</para>
<para>
Cell renderers are used to draw the data in the tree model in a
way. There are three cell renderers that come with GTK+ 2.0.
They are the <link
linkend="GtkCellRendererText">GtkCellRendererText</link>, <link
linkend="GtkCellRendererPixbuf">GtkCellRendererPixbuf</link> and
the <link
linkend="GtkCellRendererToggle">GtkCellRendererToggle</link>.
It is relatively easy to write a custom renderer.
</para>
<para>
A <link linkend="GtkTreeViewColumn">GtkTreeViewColumn</link> is the
object that GtkTreeView uses to organize the vertical columns in
the tree view. It needs to know the name of the column to label
for the user, what type of cell renderer to use, and which piece of
data to retrieve from the model for a given row.
</para>
<informalexample><programlisting><![CDATA[
GtkCellRenderer *renderer;
......@@ -178,13 +198,6 @@ column = gtk_tree_view_column_new_with_attributes ("Author",
NULL);
gtk_tree_view_append_column (GTK_TREE_VIEW (tree), column);
]]></programlisting></informalexample>
<para>
A <link linkend="GtkTreeViewColumn">GtkTreeViewColumn</link> is the
object that GtkTreeView uses to organize the vertical columns in
the tree view. It needs to know the name of the column to label
for the user, what type of cell renderer to use, and which piece of
data to retrieve from the model for a given row.
</para>
<para>
At this point, all the steps in creating a displayable tree have been
covered. The model is created, data is stored in it, a tree view is
......@@ -283,12 +296,13 @@ setup_tree (void)
/* Create a cell render and arbitrarily make it red for demonstration
* purposes */
renderer = gtk_cell_renderer_text_new ();
g_object_set (G_OBJECT (renderer), "foreground", "red", NULL);
g_object_set (G_OBJECT (renderer),
"foreground", "red",
NULL);
/* Create a column, associating the "text" attribute of the
* cell_renderer to the first column of the model */
column = gtk_tree_view_column_new_with_attributes ("Author",
renderer,
column = gtk_tree_view_column_new_with_attributes ("Author", renderer,
"text", AUTHOR_COLUMN,
NULL);
......
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