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/* Treeview Zebra Stripes:
* (based on gtk3-classic patch 'treeview__alternating_row_colours.patch'):
*
* Adds appropriate style classes to each cell in a GtkTreeView, so that themes
* can draw the rows of a treeview in alternating colours, also known as
* 'zebra stripes'.
*/
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <glib.h>
#include <cairo/cairo.h>
#include <gtk3-classic.h>
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "Gtk3-Classic::Treeview-Zebra-Stripes"
static gboolean find_row_index (GtkTreeView * treeview,
GtkTreeModel * model,
GtkTreeIter * start_iter,
GtkTreePath * target_path,
int * index);
INTERCEPTED_CLASS_METHOD (gtk_cell_area, render,
(GtkCellArea * area,
GtkCellAreaContext * context,
GtkWidget * widget,
cairo_t * cr,
const GdkRectangle * background_area,
const GdkRectangle * cell_area,
GtkCellRendererState flags,
gboolean paint_focus),
void)
void treeview_zebra_stripes_init ()
{
GtkCellAreaClass * gtk_cell_area_class =
g_type_class_ref (GTK_TYPE_CELL_AREA);
INTERCEPT_CLASS_METHOD (gtk_cell_area, GTK_CELL_AREA_CLASS,
render)
g_type_class_unref (gtk_cell_area_class);
}
static void
new_gtk_cell_area_render
(GtkCellArea * area,
GtkCellAreaContext * context,
GtkWidget * widget,
cairo_t * cr,
const GdkRectangle * background_area,
const GdkRectangle * cell_area,
GtkCellRendererState flags,
gboolean paint_focus)
{
GtkTreeView * treeview;
GtkTreeModel * model;
GtkStyleContext * style;
gint bin_x, bin_y;
GtkTreePath * path;
int index;
GtkTreeViewColumn * column;
GList * columns;
if (GTK_IS_TREE_VIEW (widget))
{
treeview = GTK_TREE_VIEW (widget);
model = gtk_tree_view_get_model (treeview);
style = gtk_widget_get_style_context (widget);
columns = gtk_tree_view_get_columns (treeview);
bin_x = cell_area->x + cell_area->width - 1;
bin_y = cell_area->y + cell_area->height - 1;
gtk_tree_view_get_path_at_pos (treeview, bin_x, bin_y,
&path, &column, NULL, NULL);
if (path != NULL)
{
index = 0;
find_row_index (treeview, model, NULL, path, &index);
gtk_tree_path_free (path);
gtk_style_context_add_class (style,
((index % 2) ? "even" : "odd"));
}
if (column == columns->data)
gtk_style_context_add_class (style, "first");
if (column == g_list_last (columns)->data)
gtk_style_context_add_class (style, "last");
if ((flags & GTK_CELL_RENDERER_SORTED))
gtk_style_context_add_class (style, "sorted");
gtk_render_background (style, cr,
background_area->x, background_area->y,
background_area->width,
background_area->height);
}
CALL_ORIGINAL_CLASS_METHOD (gtk_cell_area, render,
(area, context, widget, cr,
background_area, cell_area,
flags, paint_focus));
}
/* Helper functions */
static gboolean
find_row_index
(GtkTreeView * treeview,
GtkTreeModel * model,
GtkTreeIter * start_iter,
GtkTreePath * target_path,
int * index)
{
GtkTreeIter iter;
GtkTreeIter child_iter;
GtkTreePath * path;
if (start_iter == NULL)
{
if (! gtk_tree_model_get_iter_first (model, &iter))
return TRUE;
}
else
iter = *start_iter;
while (1)
{
path = gtk_tree_model_get_path (model, &iter);
if (gtk_tree_path_compare (path, target_path) == 0)
{
gtk_tree_path_free (path);
return TRUE;
}
if (gtk_tree_view_row_expanded (treeview, path))
{
(*index)++;
gtk_tree_model_iter_children (model, &child_iter, &iter);
if (find_row_index (treeview, model, &child_iter,
target_path, index))
{
gtk_tree_path_free (path);
return TRUE;
}
}
gtk_tree_path_free (path);
if (! gtk_tree_model_iter_next (model, &iter))
break;
else
(*index)++;
}
return FALSE;
}
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