mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-11-10 10:50:10 +00:00
147 lines
3.8 KiB
C
147 lines
3.8 KiB
C
/* Theming/CSS Blend Modes
|
|
*
|
|
* You can blend multiple backgrounds using the CSS blend modes available.
|
|
*/
|
|
|
|
#include <gtk/gtk.h>
|
|
|
|
#define WID(x) ((GtkWidget*) gtk_builder_get_object (builder, x))
|
|
|
|
/*
|
|
* These are the available blend modes.
|
|
*/
|
|
struct {
|
|
gchar *name;
|
|
gchar *id;
|
|
} blend_modes[] =
|
|
{
|
|
{ "Color", "color" },
|
|
{ "Color (burn)", "color-burn" },
|
|
{ "Color (dodge)", "color-dodge" },
|
|
{ "Darken", "darken" },
|
|
{ "Difference", "difference" },
|
|
{ "Exclusion", "exclusion" },
|
|
{ "Hard Light", "hard-light" },
|
|
{ "Hue", "hue" },
|
|
{ "Lighten", "lighten" },
|
|
{ "Luminosity", "luminosity" },
|
|
{ "Multiply", "multiply" },
|
|
{ "Normal", "normal" },
|
|
{ "Overlay", "overlay" },
|
|
{ "Saturate", "saturation" },
|
|
{ "Screen", "screen" },
|
|
{ "Soft Light", "soft-light" },
|
|
{ NULL }
|
|
};
|
|
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wformat-nonliteral"
|
|
static void
|
|
update_css_for_blend_mode (GtkCssProvider *provider,
|
|
const gchar *blend_mode)
|
|
{
|
|
GBytes *bytes;
|
|
gchar *css;
|
|
|
|
bytes = g_resources_lookup_data ("/css_blendmodes/css_blendmodes.css", 0, NULL);
|
|
|
|
css = g_strdup_printf ((gchar*) g_bytes_get_data (bytes, NULL),
|
|
blend_mode,
|
|
blend_mode,
|
|
blend_mode);
|
|
|
|
gtk_css_provider_load_from_data (provider, css, -1);
|
|
|
|
g_bytes_unref (bytes);
|
|
g_free (css);
|
|
}
|
|
#pragma GCC diagnostic pop
|
|
|
|
static void
|
|
row_activated (GtkListBox *listbox,
|
|
GtkListBoxRow *row,
|
|
GtkCssProvider *provider)
|
|
{
|
|
const gchar *blend_mode;
|
|
|
|
blend_mode = blend_modes[gtk_list_box_row_get_index (row)].id;
|
|
|
|
update_css_for_blend_mode (provider, blend_mode);
|
|
}
|
|
|
|
static void
|
|
setup_listbox (GtkBuilder *builder,
|
|
GtkStyleProvider *provider)
|
|
{
|
|
GtkWidget *normal_row;
|
|
GtkWidget *listbox;
|
|
gint i;
|
|
|
|
normal_row = NULL;
|
|
listbox = gtk_list_box_new ();
|
|
gtk_container_add (GTK_CONTAINER (WID ("scrolledwindow")), listbox);
|
|
|
|
g_signal_connect (listbox, "row-activated", G_CALLBACK (row_activated), provider);
|
|
|
|
/* Add a row for each blend mode available */
|
|
for (i = 0; blend_modes[i].name != NULL; i++)
|
|
{
|
|
GtkWidget *label;
|
|
GtkWidget *row;
|
|
|
|
row = gtk_list_box_row_new ();
|
|
label = g_object_new (GTK_TYPE_LABEL,
|
|
"label", blend_modes[i].name,
|
|
"xalign", 0.0,
|
|
NULL);
|
|
|
|
gtk_container_add (GTK_CONTAINER (row), label);
|
|
|
|
gtk_container_add (GTK_CONTAINER (listbox), row);
|
|
|
|
/* The first selected row is "normal" */
|
|
if (g_strcmp0 (blend_modes[i].id, "normal") == 0)
|
|
normal_row = row;
|
|
}
|
|
|
|
/* Select the "normal" row */
|
|
gtk_list_box_select_row (GTK_LIST_BOX (listbox), GTK_LIST_BOX_ROW (normal_row));
|
|
g_signal_emit_by_name (G_OBJECT (normal_row), "activate");
|
|
|
|
gtk_widget_grab_focus (normal_row);
|
|
}
|
|
|
|
GtkWidget *
|
|
do_css_blendmodes (GtkWidget *do_widget)
|
|
{
|
|
static GtkWidget *window = NULL;
|
|
|
|
if (!window)
|
|
{
|
|
GtkStyleProvider *provider;
|
|
GtkBuilder *builder;
|
|
|
|
builder = gtk_builder_new_from_resource ("/css_blendmodes/blendmodes.ui");
|
|
|
|
window = WID ("window");
|
|
gtk_window_set_transient_for (GTK_WINDOW (window), GTK_WINDOW (do_widget));
|
|
g_signal_connect (window, "destroy", G_CALLBACK (gtk_widget_destroyed), &window);
|
|
|
|
/* Setup the CSS provider for window */
|
|
provider = GTK_STYLE_PROVIDER (gtk_css_provider_new ());
|
|
|
|
gtk_style_context_add_provider_for_display (gdk_display_get_default (),
|
|
provider,
|
|
GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
|
|
|
|
setup_listbox (builder, provider);
|
|
}
|
|
|
|
if (!gtk_widget_get_visible (window))
|
|
gtk_widget_show (window);
|
|
else
|
|
gtk_widget_destroy (window);
|
|
|
|
return window;
|
|
}
|