Цитата(tumanovalex @ 21.5.2020, 0:38)

#include <gtk/gtk.h>

static void destroy (GtkWidget*, gpointer);
static gboolean delete_event (GtkWidget*, GdkEvent*, gpointer);
static void color_changed(GtkColorButton*, GtkWidget*);

int main(int argc, char *argv[]) {
  GtkWidget *window, *button, *label, *hbox;
  GdkRGBA color;
  
  gtk_init(&argc, &argv);

  window= gtk_window_new(GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title(GTK_WINDOW(window), "Color Button");
  gtk_container_set_border_width(GTK_CONTAINER(window), 10);

  /* Set the initial color as #003366 and set the dialog title. */
  gdk_rgba_parse(&color, "#003366");

  button= gtk_color_button_new_with_rgba(&color);
  gtk_color_button_set_title(GTK_COLOR_BUTTON(button), "Peek a Color");

  label= gtk_label_new("Look at my color!");

  color_changed(GTK_COLOR_BUTTON(button), label);

  g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(destroy), NULL);
  g_signal_connect(G_OBJECT(window), "delete_event", G_CALLBACK(delete_event),
           NULL);

  g_signal_connect(G_OBJECT(button), "color_set",
             G_CALLBACK(color_changed),
             (gpointer)label);

  hbox= gtk_box_new(FALSE, 5);
  gtk_box_pack_start(GTK_BOX(hbox), label, FALSE, FALSE, 5);
  gtk_box_pack_start(GTK_BOX(hbox), button, FALSE, FALSE, 5);

  gtk_container_add(GTK_CONTAINER(window), hbox);
  gtk_widget_show_all(window);

  gtk_main();
  return 0;
}

/* Retrieve the selected color and set it as the GtkLabel's foreground color. */
static void color_changed(GtkColorButton *button, GtkWidget *label) {
  GdkRGBA color;

  gtk_color_chooser_get_rgba((GtkColorChooser*) button, &color);

  GtkCssProvider *css_provider= gtk_css_provider_new();

  GString *css_gstring= g_string_new("");
  g_string_printf(css_gstring,
          "* { background-image:none; "
          "background-color:%s; }",
          gdk_rgba_to_string(&color));

  gtk_css_provider_load_from_data(css_provider,
                  css_gstring->str,
                  -1, NULL);
  
  
  GtkStyleContext *context= gtk_widget_get_style_context(label);
  gtk_style_context_add_provider(context, GTK_STYLE_PROVIDER(css_provider),
                 GTK_STYLE_PROVIDER_PRIORITY_USER);
  g_object_unref(css_provider);
  g_string_free(css_gstring, TRUE);
}

/* Stop the GTK+ main loop function when the window is destroyed. */
static void destroy(GtkWidget *window, gpointer data) {
  if (window && data == NULL) {
    gtk_main_quit();
  }
}

/* Return FALSE to destroy the widget. By returning TRUE, you can cancel
   a delete-event. This can be used to confirm quitting the application. */
static gboolean delete_event(GtkWidget *window, GdkEvent *event,
                 gpointer data) {
  if (window && event && data) {
    return FALSE;
  }
  return FALSE;
}

source = colorbuttons.c
all: program

program: $(source)
    gcc -g $(source) -o $@ \
    `pkg-config --cflags gtk+-3.0` `pkg-config --libs gtk+-3.0`

clean:
    rm program

#include <gtk/gtk.h>

static void destroy (GtkWidget*, gpointer);
static void color_changed (GtkColorButton*, GtkWidget*);

int main (int argc, char *argv[])
{
  GtkWidget *window, *button, *label, *hbox;

  GdkRGBA rgba;

  gtk_init (&argc, &argv);

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title (GTK_WINDOW (window), "Color Button");
  gtk_container_set_border_width (GTK_CONTAINER (window), 10);

  g_signal_connect (G_OBJECT (window), "destroy", G_CALLBACK (destroy), NULL);

  rgba.alpha = 0.0; rgba.blue = 0.0; rgba.green = 0.0; rgba.red = 0.0;
  button = gtk_color_button_new_with_rgba(&rgba);
  label = gtk_label_new ("Look at my color!");
  gtk_widget_override_color(label, GTK_STATE_NORMAL, &rgba);

  g_signal_connect (G_OBJECT (button), "color_set", G_CALLBACK (color_changed), (gpointer) label);

  hbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
  gtk_box_pack_start(GTK_BOX (hbox), button, FALSE , TRUE , 5);
  gtk_box_pack_start(GTK_BOX (hbox), label, FALSE , TRUE , 5);

  gtk_container_add (GTK_CONTAINER (window), hbox);

  gtk_widget_show_all (window);

  gtk_main ();
  return 0;
}

static void color_changed (GtkColorButton *button, GtkWidget *label)
{
  GdkRGBA rgba;
  gtk_color_chooser_get_rgba((GtkColorChooser*) button, &rgba);
  gtk_widget_override_color(label, GTK_STATE_NORMAL, &rgba);
}

static void destroy (GtkWidget *window,          gpointer data)
{
  gtk_main_quit ();
}