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While the GtkButton widget allows you to create your own custom buttons, GTK+ provides three additional button widgets that are at your disposal: the color selection button, file chooser button, and font selection button. Each of the sections covering these three widgets will also cover other important concepts such as the GdkColor structure, file filters, and Pango fonts. These concepts will be used in later chapters, so it is a good idea to get a grasp of them now.
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Color Buttons
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The GtkColorButton widget provides a simple way for you to allow your users to select a specific color. These colors can be specified as six-digit hexadecimal values or the RGB value. The color button itself displays the selected color in a rectangular block set as the child widget of the button. An example of this can be viewed in Figure 4-9.
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CHAPTER 4 BASIC WIDGETS
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Figure 4-9. A color selection dialog
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A GtkColorButton Example
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When clicked, the color button opens a dialog that allows the user to enter in the color value or browse for a choice on the color wheel. The color wheel is provided so the user is not required to know the numeric values of the colors. Listing 4-9 shows how to use the GtkColorButton widget in an application. Listing 4-9. Color Buttons and GdkColors (colorbuttons.c) #include <gtk/gtk.h> static void color_changed (GtkColorButton*, GtkWidget*); int main (int argc, char *argv[]) { GtkWidget *window, *button, *label, *hbox; GdkColor color; gtk_init (&argc, &argv);
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CHAPTER 4 BASIC WIDGETS
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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_color_parse ("#003366", &color); button = gtk_color_button_new_with_color (&color); gtk_color_button_set_title (GTK_COLOR_BUTTON (button), "Select a Color"); label = gtk_label_new ("Look at my color!"); gtk_widget_modify_fg (label, GTK_STATE_NORMAL, &color); g_signal_connect (G_OBJECT (button), "color_set", G_CALLBACK (color_changed), (gpointer) label); hbox = gtk_hbox_new (FALSE, 5); gtk_box_pack_start_defaults (GTK_BOX (hbox), button); gtk_box_pack_start_defaults (GTK_BOX (hbox), label); 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) { GdkColor color; gtk_color_button_get_color (button, &color); gtk_widget_modify_fg (label, GTK_STATE_NORMAL, &color); } In most cases, you will want to create a GtkColorButton with an initial color value, which is done by specifying a GdkColor object to gtk_color_button_new_with_color(). The default color, if none is provided, is opaque black with the alpha option disabled.
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CHAPTER 4 BASIC WIDGETS
Storing Colors in GdkColor
GdkColor is a structure that stores red, green, and blue values for a color as shown in the following code snippet. The pixel object automatically stores the index of the color when it is allocated in a color map, so there is usually no need for you to alter this value. struct GdkColor { guint32 pixel; guint16 red; guint16 green; guint16 blue; }; After creating a new GdkColor object, if you already know the red, green, and blue values of the color, you can specify them in the following manner. Red, green, and blue values are stored as unsigned integer values ranging from 0 to 65,535, where 65,535 indicates full color intensity. For example, the following color refers to white: color.red = 65535; color.green = 65535; color.blue = 65535; In most cases, you will be more familiar with the six-digit hexadecimal value for the color, such as #FFFFFF that refers to the color white. Therefore, GDK provides gdk_color_parse(), which parses the hexadecimal color into the correct RGB values. This function was used in Listing 4-9. gboolean gdk_color_parse (const gchar *color_string, GdkColor *color);
Using the Color Button
After setting your initial color, you can choose the title that will be given to the color selection dialog with gtk_color_button_set_title(). By default, the title is Pick a Color , so it is not necessary to set this value if you are content with this title. void gtk_color_button_set_title (GtkColorButton *button, const gchar *title); The color selection dialog, covered in the next chapter in more detail, is shown when the user clicks the button. It allows the user to change the selected color. You can view the color selection dialog in Figure 4-9. When the color value is changed, the color-set signal is emitted for the widget. In Listing 4-5, the signal is caught and the foreground color of a GtkLabel changed with gtk_widget_modify_fg() as follows: gtk_color_button_get_color (button, &color); gtk_widget_modify_fg (label, GTK_STATE_NORMAL, &color);
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