gtk/demos/gtk-demo/css_pixbufs.c
Matthias Clasen 386b63b85d scrolledwindow: Don't take adjustments in new()
In 99.9% of all cases, these are just NULL, NULL.
So just do away with these arguments, people can
use the setters for the rare cases where they want
the scrolled window to use a different adjustment.
2020-06-24 11:25:09 -04:00

130 lines
4.2 KiB
C

/* Theming/Animated Backgrounds
*
* This demo is done in honour of the Pixbufs demo further down.
* It is done exclusively with CSS as the background of the window.
*/
#include <gtk/gtk.h>
static void
show_parsing_error (GtkCssProvider *provider,
GtkCssSection *section,
const GError *error,
GtkTextBuffer *buffer)
{
const GtkCssLocation *start_location, *end_location;
GtkTextIter start, end;
const char *tag_name;
start_location = gtk_css_section_get_start_location (section);
gtk_text_buffer_get_iter_at_line_index (buffer,
&start,
start_location->lines,
start_location->line_bytes);
end_location = gtk_css_section_get_end_location (section);
gtk_text_buffer_get_iter_at_line_index (buffer,
&end,
end_location->lines,
end_location->line_bytes);
if (error->domain == GTK_CSS_PARSER_WARNING)
tag_name = "warning";
else
tag_name = "error";
gtk_text_buffer_apply_tag_by_name (buffer, tag_name, &start, &end);
}
static void
css_text_changed (GtkTextBuffer *buffer,
GtkCssProvider *provider)
{
GtkTextIter start, end;
char *text;
gtk_text_buffer_get_start_iter (buffer, &start);
gtk_text_buffer_get_end_iter (buffer, &end);
gtk_text_buffer_remove_all_tags (buffer, &start, &end);
text = gtk_text_buffer_get_text (buffer, &start, &end, FALSE);
gtk_css_provider_load_from_data (provider, text, -1);
g_free (text);
}
static void
apply_css (GtkWidget *widget, GtkStyleProvider *provider)
{
GtkWidget *child;
gtk_style_context_add_provider (gtk_widget_get_style_context (widget), provider, G_MAXUINT);
for (child = gtk_widget_get_first_child (widget);
child != NULL;
child = gtk_widget_get_next_sibling (child))
apply_css (child, provider);
}
GtkWidget *
do_css_pixbufs (GtkWidget *do_widget)
{
static GtkWidget *window = NULL;
if (!window)
{
GtkWidget *paned, *container, *child;
GtkStyleProvider *provider;
GtkTextBuffer *text;
GBytes *bytes;
window = gtk_window_new ();
gtk_window_set_title (GTK_WINDOW (window), "Animated Backgrounds");
gtk_window_set_transient_for (GTK_WINDOW (window), GTK_WINDOW (do_widget));
gtk_window_set_default_size (GTK_WINDOW (window), 400, 300);
g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
paned = gtk_paned_new (GTK_ORIENTATION_VERTICAL);
gtk_window_set_child (GTK_WINDOW (window), paned);
/* Need a filler so we get a handle */
child = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_paned_set_start_child (GTK_PANED (paned), child);
text = gtk_text_buffer_new (NULL);
gtk_text_buffer_create_tag (text,
"warning",
"underline", PANGO_UNDERLINE_SINGLE,
NULL);
gtk_text_buffer_create_tag (text,
"error",
"underline", PANGO_UNDERLINE_ERROR,
NULL);
provider = GTK_STYLE_PROVIDER (gtk_css_provider_new ());
container = gtk_scrolled_window_new ();
gtk_paned_set_end_child (GTK_PANED (paned), container);
child = gtk_text_view_new_with_buffer (text);
gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (container), child);
g_signal_connect (text, "changed",
G_CALLBACK (css_text_changed), provider);
bytes = g_resources_lookup_data ("/css_pixbufs/gtk.css", 0, NULL);
gtk_text_buffer_set_text (text, g_bytes_get_data (bytes, NULL), g_bytes_get_size (bytes));
g_bytes_unref (bytes);
g_signal_connect (provider,
"parsing-error",
G_CALLBACK (show_parsing_error),
gtk_text_view_get_buffer (GTK_TEXT_VIEW (child)));
apply_css (window, provider);
}
if (!gtk_widget_get_visible (window))
gtk_widget_show (window);
else
gtk_window_destroy (GTK_WINDOW (window));
return window;
}