gtk2/demos/gtk-demo/colorsel.c
2017-10-06 20:42:04 -04:00

117 lines
3.2 KiB
C

/* Color Chooser
*
* A GtkColorChooser lets the user choose a color. There are several
* implementations of the GtkColorChooser interface in GTK+. The
* GtkColorChooserDialog is a prebuilt dialog containing a
* GtkColorChooserWidget.
*/
#include <gtk/gtk.h>
static GtkWidget *window = NULL;
static GtkWidget *da;
static GdkRGBA color;
static GtkWidget *frame;
/* draw callback for the drawing area
*/
static void
draw_function (GtkDrawingArea *da,
cairo_t *cr,
int width,
int height,
gpointer data)
{
gdk_cairo_set_source_rgba (cr, &color);
cairo_paint (cr);
}
static void
response_cb (GtkDialog *dialog,
gint response_id,
gpointer user_data)
{
if (response_id == GTK_RESPONSE_OK)
{
gtk_color_chooser_get_rgba (GTK_COLOR_CHOOSER (dialog), &color);
gtk_widget_queue_draw (da);
}
gtk_widget_destroy (GTK_WIDGET (dialog));
}
static void
change_color_callback (GtkWidget *button,
gpointer data)
{
GtkWidget *dialog;
dialog = gtk_color_chooser_dialog_new ("Changing color", GTK_WINDOW (window));
gtk_window_set_modal (GTK_WINDOW (dialog), TRUE);
gtk_color_chooser_set_rgba (GTK_COLOR_CHOOSER (dialog), &color);
g_signal_connect (dialog, "response",
G_CALLBACK (response_cb), NULL);
gtk_widget_show (dialog);
}
GtkWidget *
do_colorsel (GtkWidget *do_widget)
{
GtkWidget *vbox;
GtkWidget *button;
if (!window)
{
color.red = 0;
color.blue = 1;
color.green = 0;
color.alpha = 1;
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_screen (GTK_WINDOW (window),
gtk_widget_get_screen (do_widget));
gtk_window_set_title (GTK_WINDOW (window), "Color Chooser");
gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
g_signal_connect (window, "destroy",
G_CALLBACK (gtk_widget_destroyed), &window);
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 8);
g_object_set (vbox, "margin", 12, NULL);
gtk_container_add (GTK_CONTAINER (window), vbox);
/*
* Create the color swatch area
*/
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (vbox), frame);
da = gtk_drawing_area_new ();
gtk_drawing_area_set_content_width (GTK_DRAWING_AREA (da), 200);
gtk_drawing_area_set_content_height (GTK_DRAWING_AREA (da), 200);
gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (da), draw_function, NULL, NULL);
gtk_container_add (GTK_CONTAINER (frame), da);
button = gtk_button_new_with_mnemonic ("_Change the above color");
gtk_widget_set_halign (button, GTK_ALIGN_END);
gtk_widget_set_valign (button, GTK_ALIGN_CENTER);
gtk_box_pack_start (GTK_BOX (vbox), button);
g_signal_connect (button, "clicked",
G_CALLBACK (change_color_callback), NULL);
}
if (!gtk_widget_get_visible (window))
gtk_widget_show (window);
else
gtk_widget_destroy (window);
return window;
}