forked from AuroraMiddleware/gtk
119 lines
3.9 KiB
C
119 lines
3.9 KiB
C
/* Theming/CSS Basics
|
|
*
|
|
* Gtk themes are written using CSS. Every widget is build of multiple items
|
|
* that you can style very similarly to a regular website.
|
|
*
|
|
*/
|
|
|
|
#include <gtk/gtk.h>
|
|
|
|
static void
|
|
show_parsing_error (GtkCssProvider *provider,
|
|
GtkCssSection *section,
|
|
const GError *error,
|
|
GtkTextBuffer *buffer)
|
|
{
|
|
GtkTextIter start, end;
|
|
const char *tag_name;
|
|
|
|
gtk_text_buffer_get_iter_at_line_index (buffer,
|
|
&start,
|
|
gtk_css_section_get_start_line (section),
|
|
gtk_css_section_get_start_position (section));
|
|
gtk_text_buffer_get_iter_at_line_index (buffer,
|
|
&end,
|
|
gtk_css_section_get_end_line (section),
|
|
gtk_css_section_get_end_position (section));
|
|
|
|
if (g_error_matches (error, GTK_CSS_PROVIDER_ERROR, GTK_CSS_PROVIDER_ERROR_DEPRECATED))
|
|
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, NULL);
|
|
g_free (text);
|
|
|
|
gtk_style_context_reset_widgets (gdk_screen_get_default ());
|
|
}
|
|
|
|
static void
|
|
apply_css (GtkWidget *widget, GtkStyleProvider *provider)
|
|
{
|
|
gtk_style_context_add_provider (gtk_widget_get_style_context (widget), provider, G_MAXUINT);
|
|
if (GTK_IS_CONTAINER (widget))
|
|
gtk_container_forall (GTK_CONTAINER (widget), (GtkCallback) apply_css, provider);
|
|
}
|
|
|
|
GtkWidget *
|
|
do_css_basics (GtkWidget *do_widget)
|
|
{
|
|
static GtkWidget *window = NULL;
|
|
|
|
if (!window)
|
|
{
|
|
GtkWidget *container, *child;
|
|
GtkStyleProvider *provider;
|
|
GtkTextBuffer *text;
|
|
GBytes *bytes;
|
|
|
|
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
|
|
gtk_window_set_title (GTK_WINDOW (window), "CSS Basics");
|
|
gtk_window_set_transient_for (GTK_WINDOW (window), GTK_WINDOW (do_widget));
|
|
gtk_window_set_default_size (GTK_WINDOW (window), 400, 300);
|
|
g_signal_connect (window, "destroy",
|
|
G_CALLBACK (gtk_widget_destroyed), &window);
|
|
|
|
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 (NULL, NULL);
|
|
gtk_container_add (GTK_CONTAINER (window), container);
|
|
child = gtk_text_view_new_with_buffer (text);
|
|
gtk_container_add (GTK_CONTAINER (container), child);
|
|
g_signal_connect (text, "changed",
|
|
G_CALLBACK (css_text_changed), provider);
|
|
|
|
bytes = g_resources_lookup_data ("/css_basics/css_basics.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_all (window);
|
|
else
|
|
gtk_widget_destroy (window);
|
|
|
|
return window;
|
|
}
|