| Gnome User Interface Library Reference Manual | |||
|---|---|---|---|
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| #include <gnome.h> struct GnomeColorPicker; | 
| 
 | 
This widget provides color selection facilities to your application. The widget appears as a button which contains a "color swatch" of the currently selected color. When the button is pressed, the widget presents the user with a color selection dialog where the color can be selected.
You can select the color to be displayed in a number of ways: floating point values for the red, green and blue channels, integers in the range 0 to 65,535, or integers in the range 0 to 255, depending on your needs.
| void color_picked_callback(GtkWidget *w, guint r, guint g, guint b, guint a, gpointer data)
{
	g_print("User selected color (rgba): d d d d\n", r, g, b, a);
	/* save colors to configuration file, or use them some other way */
}
...
GtkWidget *cp;
/* create a color picker, set a default color */
cp = gnome_color_picker_new();
gnome_color_picker_set_i8(GNOME_COLOR_PICKER(cp),
			  255, 0, 0, 0);
/* connect a function to our widget */
gtk_signal_connect(GTK_OBJECT(cp), "color_set",
		   GTK_SIGNAL_FUNC(color_picked_callback), NULL);
...
/* retrieve color from our widget, someplace else in code */
gdouble r, g, b, a;
gnome_color_picker_get_d(GNOME_COLOR_PICKER(cp),
			 &r, &g, &b, &a);
g_print("Color (rgba): %g %g %g %g\n", r, g, b, a);
   | 
| 
 | 
Creates a new GNOME color picker widget. This returns a widget in the form of a small button containing a swatch representing the current selected color. When the button is clicked, a color-selection dialog will open, allowing the user to select a color. The swatch will be updated to reflect the new color when the user finishes.
| void gnome_color_picker_set_d (GnomeColorPicker *cp, | 
Set color shown in the color picker widget using floating point values.
| void gnome_color_picker_get_d (GnomeColorPicker *cp, | 
Retrieve color currently selected in the color picker widget in the form of floating point values.
| cp : | Pointer to GNOME color picker widget. | 
| r : | Output location of red color component, values are in [0.0, 1.0] | 
| g : | Output location of green color component, values are in [0.0, 1.0] | 
| b : | Output location of blue color component, values are in [0.0, 1.0] | 
| a : | Output location of alpha color component, values are in [0.0, 1.0] | 
| void gnome_color_picker_set_i8 (GnomeColorPicker *cp, | 
Set color shown in the color picker widget using 8-bit integer values.
| void gnome_color_picker_get_i8 (GnomeColorPicker *cp, | 
Retrieve color currently selected in the color picker widget in the form of 8-bit integer values.
| cp : | Pointer to GNOME color picker widget. | 
| r : | Output location of red color component, values are in [0, 255] | 
| g : | Output location of green color component, values are in [0, 255] | 
| b : | Output location of blue color component, values are in [0, 255] | 
| a : | Output location of alpha color component, values are in [0, 255] | 
| void gnome_color_picker_set_i16 (GnomeColorPicker *cp, | 
Set color shown in the color picker widget using 16-bit integer values.
| void gnome_color_picker_get_i16 (GnomeColorPicker *cp, | 
Retrieve color currently selected in the color picker widget in the form of 16-bit integer values.
| cp : | Pointer to GNOME color picker widget. | 
| r : | Output location of red color component, values are in [0, 65535] | 
| g : | Output location of green color component, values are in [0, 65535] | 
| b : | Output location of blue color component, values are in [0, 65535] | 
| a : | Output location of alpha color component, values are in [0, 65535] | 
| void gnome_color_picker_set_dither (GnomeColorPicker *cp, | 
Sets whether the picker should dither the color sample or just paint a solid rectangle.
| void        gnome_color_picker_set_use_alpha
                                            (GnomeColorPicker *cp,
                                              | 
Sets whether or not the picker should use the alpha channel.
| void gnome_color_picker_set_title (GnomeColorPicker *cp, const | 
Sets the title for the color selection dialog.