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Строка 1: |
| - | In this part of the GTK+ programming tutorial, we will work with menus and toolbars.
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| - | A <b>menubar</b> is one of the most common parts of the GUI application. It is a group of commands located in various menus. While in console applications you had to remember all those arcane commands, here we have most of the commands grouped into logical parts. There are accepted standards that further reduce the amount of time spending to learn a new application.
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| - |
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| - | == Simple menu example ==
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| - |
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| - | In our first example, we will create a menubar with one file menu. The menu will have only one menu item. By selecting the item the application quits.
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| - |
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| - | <source lang="cpp">
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| - | #include <gtk/gtk.h>
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| - |
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| - |
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| - | int main( int argc, char *argv[])
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| - | {
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| - |
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| - | GtkWidget *window;
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| - | GtkWidget *vbox;
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| - |
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| - | GtkWidget *menubar;
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| - | GtkWidget *filemenu;
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| - | GtkWidget *file;
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| - | GtkWidget *quit;
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| - |
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| - | gtk_init(&argc, &argv);
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| - |
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| - | window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
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| - | gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
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| - | gtk_window_set_default_size(GTK_WINDOW(window), 250, 200);
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| - | gtk_window_set_title(GTK_WINDOW(window), "menu");
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| - |
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| - | vbox = gtk_vbox_new(FALSE, 0);
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| - | gtk_container_add(GTK_CONTAINER(window), vbox);
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| - |
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| - | menubar = gtk_menu_bar_new();
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| - | filemenu = gtk_menu_new();
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| - |
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| - | file = gtk_menu_item_new_with_label("File");
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| - | quit = gtk_menu_item_new_with_label("Quit");
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| - |
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| - | gtk_menu_item_set_submenu(GTK_MENU_ITEM(file), filemenu);
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| - | gtk_menu_shell_append(GTK_MENU_SHELL(filemenu), quit);
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| - | gtk_menu_shell_append(GTK_MENU_SHELL(menubar), file);
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| - | gtk_box_pack_start(GTK_BOX(vbox), menubar, FALSE, FALSE, 3);
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| - |
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| - | g_signal_connect_swapped(G_OBJECT(window), "destroy",
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| - | G_CALLBACK(gtk_main_quit), NULL);
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| - |
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| - | g_signal_connect(G_OBJECT(quit), "activate",
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| - | G_CALLBACK(gtk_main_quit), NULL);
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| - |
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| - | gtk_widget_show_all(window);
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| - |
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| - | gtk_main();
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| - |
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| - | return 0;
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| - | }
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| - |
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| - | </source>
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| - |
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| - | Creating a menubar is a bit confusing. We must bear in mind that both a <b>menubar</b> and <b>menus</b> are derived from the same widget, namely a <b>menu shell</b>. <b>menu items</b> are only valid childs for menus. They are also used to implement submenus.
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| - |
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| - | <source lang="cpp">
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| - | menubar = gtk_menu_bar_new();
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| - | filemenu = gtk_menu_new();
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| - | </source>
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| - |
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| - | In this code we create a menubar and a menu.
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| - |
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| - | <source lang="cpp">
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| - | gtk_menu_item_set_submenu(GTK_MENU_ITEM(file), filemenu);
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| - | </source>
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| - |
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| - | This code line implements a file menu. The logic is that the menubar is a menu shell. file menu is also a menu shell.
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| - | That's why we look at the file menu as a submenu or a subshell.
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| - |
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| - | <source lang="cpp">
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| - | gtk_menu_shell_append(GTK_MENU_SHELL(filemenu), quit);
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| - | gtk_menu_shell_append(GTK_MENU_SHELL(menubar), file);
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| - | </source>
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| - |
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| - | Menu items are implemented by calling the <b>gtk_menu_shell_append()</b> function. menu items are appended to menu shells. In our case, quit menu item is appended to a file menu and also the file menu item is appended to the menubar.
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| - |
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| - | <source lang="cpp">
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| - | g_signal_connect(G_OBJECT(quit), "activate",
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| - | G_CALLBACK(gtk_main_quit), NULL);
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| - | </source>
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| - |
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| - | By selecting the quit menu item, we quit the application.
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| - |
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| - | [[image: gtk_faq_simplemenu.png | center]]
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| - |
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| - | == Image menus, mnemonics & accelerators ==
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| - |
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| - | In the next example, we will further explore the functionality that we can use in GTK+.
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| - | <b>Accelerators</b> are keyboard shortcuts for activating a menu item. <b>Mnemonics</b> are keyboard shortcuts for GUI elements. They are represented as underlined characters.
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| - |
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| - | <source lang="cpp">
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| - | #include <gtk/gtk.h>
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| - | #include <gdk/gdkkeysyms.h>
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| - |
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| - | int main( int argc, char *argv[])
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| - | {
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| - |
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| - | GtkWidget *window;
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| - | GtkWidget *vbox;
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| - |
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| - | GtkWidget *menubar;
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| - | GtkWidget *filemenu;
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| - | GtkWidget *file;
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| - | GtkWidget *new;
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| - | GtkWidget *open;
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| - | GtkWidget *quit;
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| - |
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| - | GtkWidget *sep;
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| - |
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| - | GtkAccelGroup *accel_group = NULL;
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| - |
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| - | gtk_init(&argc, &argv);
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| - |
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| - | window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
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| - | gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
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| - | gtk_window_set_default_size(GTK_WINDOW(window), 250, 200);
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| - | gtk_window_set_title(GTK_WINDOW(window), "menu");
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| - |
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| - | vbox = gtk_vbox_new(FALSE, 0);
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| - | gtk_container_add(GTK_CONTAINER(window), vbox);
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| - |
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| - | menubar = gtk_menu_bar_new();
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| - | filemenu = gtk_menu_new();
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| - |
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| - | accel_group = gtk_accel_group_new();
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| - | gtk_window_add_accel_group(GTK_WINDOW(window), accel_group);
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| - |
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| - | file = gtk_menu_item_new_with_mnemonic("_File");
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| - | new = gtk_image_menu_item_new_from_stock(GTK_STOCK_NEW, NULL);
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| - | open = gtk_image_menu_item_new_from_stock(GTK_STOCK_OPEN, NULL);
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| - | sep = gtk_separator_menu_item_new();
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| - | quit = gtk_image_menu_item_new_from_stock(GTK_STOCK_QUIT, accel_group);
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| - |
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| - | gtk_widget_add_accelerator(quit, "activate", accel_group,
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| - | GDK_q, GDK_CONTROL_MASK, GTK_ACCEL_VISIBLE);
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| - |
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| - |
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| - | gtk_menu_item_set_submenu(GTK_MENU_ITEM(file), filemenu);
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| - | gtk_menu_shell_append(GTK_MENU_SHELL(filemenu), new);
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| - | gtk_menu_shell_append(GTK_MENU_SHELL(filemenu), open);
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| - | gtk_menu_shell_append(GTK_MENU_SHELL(filemenu), sep);
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| - | gtk_menu_shell_append(GTK_MENU_SHELL(filemenu), quit);
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| - | gtk_menu_shell_append(GTK_MENU_SHELL(menubar), file);
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| - | gtk_box_pack_start(GTK_BOX(vbox), menubar, FALSE, FALSE, 3);
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| - |
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| - | g_signal_connect_swapped(G_OBJECT(window), "destroy",
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| - | G_CALLBACK(gtk_main_quit), NULL);
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| - |
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| - | g_signal_connect(G_OBJECT(quit), "activate",
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| - | G_CALLBACK(gtk_main_quit), NULL);
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| - |
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| - | gtk_widget_show_all(window);
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| - |
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| - | gtk_main();
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| - |
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| - | return 0;
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| - | }
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| - | </source>
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| - |
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| - | The example shows, how to add an image to our menu item. How to set up an accelerator and how to use mnemonics in our GTK+ applications.
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| - |
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| - | <source lang="cpp">
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| - | accel_group = gtk_accel_group_new();
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| - | gtk_window_add_accel_group(GTK_WINDOW(window), accel_group);
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| - | ...
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| - | quit = gtk_image_menu_item_new_from_stock(GTK_STOCK_QUIT, accel_group);
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| - | gtk_widget_add_accelerator(quit, "activate", accel_group,
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| - | GDK_q, GDK_CONTROL_MASK, GTK_ACCEL_VISIBLE);
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| - | </source>
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| - |
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| - | An accelerator group is a group of keyboard accelerators, typically attached to a toplevel window.
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| - | Here we create Ctrl + q keyboard accelerator.
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| - |
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| - | <source lang="cpp">
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| - | file = gtk_menu_item_new_with_mnemonic("_File");
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| - | </source>
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| - |
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| - | To create a mnemonic, we call the <b>gtk_menu_item_new_with_mnemonic()</b> funtion.
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| - | We select the file menu item by pressing the Alt + F.
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| - |
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| - | <source lang="cpp">
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| - | new = gtk_image_menu_item_new_from_stock(GTK_STOCK_NEW, NULL);
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| - | open = gtk_image_menu_item_new_from_stock(GTK_STOCK_OPEN, NULL);
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| - |
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| - | </source>
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| - |
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| - | Here we create two image menu items. By setting the second parameter of the function to NULL, we automatically create accelerators.
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| - | We provide an image and text for our menu item from internal GTK+ resources.
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| - |
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| - | <source lang="cpp">
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| - | sep = gtk_separator_menu_item_new();
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| - | </source>
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| - |
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| - | Menu items can be separated by a horizontal separator. This way we can put menu items into some logical groups.
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| - |
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| - | [[image: gtk_faq_menu.png | center]]
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| - |
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| - | == Check menu item ==
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| - |
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| - | A <b>GtkCheckMenuItem</b> is a menu item with a check box.
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| - |
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| - | <source lang="cpp">
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| - | #include <gtk/gtk.h>
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| - |
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| - | void toggle_statusbar(GtkWidget *widget, gpointer statusbar)
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| - | {
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| - | if (gtk_check_menu_item_get_active(GTK_CHECK_MENU_ITEM(widget))) {
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| - | gtk_widget_show(statusbar);
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| - | } else {
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| - | gtk_widget_hide(statusbar);
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| - | }
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| - | }
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| - |
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| - |
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| - | int main( int argc, char *argv[])
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| - | {
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| - |
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| - | GtkWidget *window;
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| - | GtkWidget *vbox;
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| - |
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| - | GtkWidget *menubar;
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| - | GtkWidget *viewmenu;
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| - | GtkWidget *view;
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| - | GtkWidget *tog_stat;
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| - | GtkWidget *statusbar;
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| - |
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| - |
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| - | gtk_init(&argc, &argv);
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| - |
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| - | window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
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| - | gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
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| - | gtk_window_set_default_size(GTK_WINDOW(window), 250, 200);
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| - | gtk_window_set_title(GTK_WINDOW(window), "view statusbar");
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| - |
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| - | vbox = gtk_vbox_new(FALSE, 0);
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| - | gtk_container_add(GTK_CONTAINER(window), vbox);
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| - |
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| - | menubar = gtk_menu_bar_new();
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| - | viewmenu = gtk_menu_new();
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| - |
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| - | view = gtk_menu_item_new_with_label("View");
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| - | tog_stat = gtk_check_menu_item_new_with_label("View Statusbar");
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| - | gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(tog_stat), TRUE);
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| - |
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| - | gtk_menu_item_set_submenu(GTK_MENU_ITEM(view), viewmenu);
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| - | gtk_menu_shell_append(GTK_MENU_SHELL(viewmenu), tog_stat);
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| - | gtk_menu_shell_append(GTK_MENU_SHELL(menubar), view);
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| - | gtk_box_pack_start(GTK_BOX(vbox), menubar, FALSE, FALSE, 3);
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| - |
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| - | statusbar = gtk_statusbar_new();
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| - | gtk_box_pack_end(GTK_BOX(vbox), statusbar, FALSE, TRUE, 1);
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| - |
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| - | g_signal_connect_swapped(G_OBJECT(window), "destroy",
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| - | G_CALLBACK(gtk_main_quit), NULL);
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| - |
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| - | g_signal_connect(G_OBJECT(tog_stat), "activate",
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| - | G_CALLBACK(toggle_statusbar), statusbar);
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| - |
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| - | gtk_widget_show_all(window);
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| - |
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| - | gtk_main();
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| - |
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| - | return 0;
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| - | }
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| - | </source>
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| - |
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| - | In our code example we show a check menu item. If the check box is activated, the statusbar widget is shown. If not, the statusbar is hidden.
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| - |
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| - | <source lang="cpp">
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| - | tog_stat = gtk_check_menu_item_new_with_label("View Statusbar");
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| - | </source>
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| - |
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| - | The <b>gtk_check_menu_item_new_with_label()</b> function call creates a new check menu item.
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| - |
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| - | <source lang="cpp">
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| - | if (gtk_check_menu_item_get_active(GTK_CHECK_MENU_ITEM(widget))) {
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| - | gtk_widget_show(statusbar);
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| - | } else {
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| - | gtk_widget_hide(statusbar);
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| - | }
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| - | </source>
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| - |
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| - | If the check box in the menu item is activated, we show the statusbar widget. Otherwise the statusbar is hidden.
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| - |
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| - | [[image: gtk_faq_checkmenuitem.png | center]]
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| - |
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| - | == A toolbar ==
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| - |
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| - | Menus group commands that we can use in application. Toolbars provide a quick access to the most frequently used commands.
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| - |
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| - | <source lang="cpp">
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| - | #include <gtk/gtk.h>
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| - |
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| - | int main( int argc, char *argv[])
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| - | {
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| - |
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| - | GtkWidget *window;
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| - | GtkWidget *vbox;
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| - |
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| - | GtkWidget *toolbar;
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| - | GtkToolItem *new;
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| - | GtkToolItem *open;
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| - | GtkToolItem *save;
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| - | GtkToolItem *sep;
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| - | GtkToolItem *exit;
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| - |
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| - |
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| - | gtk_init(&argc, &argv);
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| - |
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| - | window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
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| - | gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
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| - | gtk_window_set_default_size(GTK_WINDOW(window), 250, 200);
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| - | gtk_window_set_title(GTK_WINDOW(window), "toolbar");
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| - |
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| - | vbox = gtk_vbox_new(FALSE, 0);
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| - | gtk_container_add(GTK_CONTAINER(window), vbox);
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| - |
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| - |
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| - | toolbar = gtk_toolbar_new();
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| - | gtk_toolbar_set_style(GTK_TOOLBAR(toolbar), GTK_TOOLBAR_ICONS);
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| - |
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| - | gtk_container_set_border_width(GTK_CONTAINER(toolbar), 2);
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| - |
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| - | new = gtk_tool_button_new_from_stock(GTK_STOCK_NEW);
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| - | gtk_toolbar_insert(GTK_TOOLBAR(toolbar), new, -1);
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| - |
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| - | open = gtk_tool_button_new_from_stock(GTK_STOCK_OPEN);
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| - | gtk_toolbar_insert(GTK_TOOLBAR(toolbar), open, -1);
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| - |
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| - | save = gtk_tool_button_new_from_stock(GTK_STOCK_SAVE);
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| - | gtk_toolbar_insert(GTK_TOOLBAR(toolbar), save, -1);
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| - |
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| - | sep = gtk_separator_tool_item_new();
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| - | gtk_toolbar_insert(GTK_TOOLBAR(toolbar), sep, -1);
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| - |
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| - | exit = gtk_tool_button_new_from_stock(GTK_STOCK_QUIT);
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| - | gtk_toolbar_insert(GTK_TOOLBAR(toolbar), exit, -1);
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| - |
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| - | gtk_box_pack_start(GTK_BOX(vbox), toolbar, FALSE, FALSE, 5);
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| - |
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| - | g_signal_connect(G_OBJECT(exit), "clicked",
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| - | G_CALLBACK(gtk_main_quit), NULL);
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| - |
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| - | g_signal_connect_swapped(G_OBJECT(window), "destroy",
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| - | G_CALLBACK(gtk_main_quit), NULL);
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| - |
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| - | gtk_widget_show_all(window);
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| - |
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| - | gtk_main();
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| - |
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| - | return 0;
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| - | }
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| - | </source>
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| - |
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| - | The code example creates simple toolbar example.
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| - |
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| - | <source lang="cpp">
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| - | toolbar = gtk_toolbar_new();
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| - | gtk_toolbar_set_style(GTK_TOOLBAR(toolbar), GTK_TOOLBAR_ICONS)
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| - | </source>
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| - |
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| - | We create a new toolbar. We specify that the toobar buttons show only icons. No text.
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| - |
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| - | <source lang="cpp">
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| - | new = gtk_tool_button_new_from_stock(GTK_STOCK_NEW);
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| - | gtk_toolbar_insert(GTK_TOOLBAR(toolbar), new, -1);
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| - | </source>
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| - |
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| - | We create a toolbar button from stock. The toolbar buttons are inserted into the toolbar by the <b>gtk_toolbar_insert()</b> function call.
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| - |
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| - | <source lang="cpp">
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| - | sep = gtk_separator_tool_item_new();
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| - | gtk_toolbar_insert(GTK_TOOLBAR(toolbar), sep, -1);
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| - | </source>
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| - |
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| - | Here we insert a separator into the toolbar.
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| - |
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| - | [[image: gtk_faq_toolbar.png | center]]
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| - |
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| - | == Undo redo ==
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| - |
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| - | The following example demonstrates, how we can inactivate toolbar buttons on the toolbar. It is a common practise in GUI programming. For example the save button. If we save all changes of our document to the disk, the save button is inactivated in most text editors. This way the application indicates to the user, that all changes are already saved.
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| - |
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| - | <source lang="cpp">
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| - | #include <gtk/gtk.h>
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| - | #include <string.h>
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| - |
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| - | void undo_redo(GtkWidget *widget, gpointer item)
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| - | {
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| - | static int count = 2;
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| - | const char *name = gtk_widget_get_name(widget);
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| - |
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| - | if ( strcmp(name, "undo") ) {
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| - | count++;
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| - | } else {
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| - | count--;
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| - | }
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| - |
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| - | if (count < 0) {
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| - | gtk_widget_set_sensitive(widget, FALSE);
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| - | gtk_widget_set_sensitive(item, TRUE);
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| - | }
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| - |
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| - | if (count > 5) {
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| - | gtk_widget_set_sensitive(widget, FALSE);
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| - | gtk_widget_set_sensitive(item, TRUE);
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| - | }
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| - | }
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| - |
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| - |
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| - | int main( int argc, char *argv[])
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| - | {
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| - |
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| - | GtkWidget *window;
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| - | GtkWidget *vbox;
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| - |
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| - | GtkWidget *toolbar;
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| - | GtkToolItem *undo;
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| - | GtkToolItem *redo;
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| - | GtkToolItem *sep;
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| - | GtkToolItem *exit;
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| - |
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| - |
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| - | gtk_init(&argc, &argv);
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| - |
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| - | window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
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| - | gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
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| - | gtk_window_set_default_size(GTK_WINDOW(window), 250, 200);
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| - | gtk_window_set_title(GTK_WINDOW(window), "undoredo");
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| - |
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| - | vbox = gtk_vbox_new(FALSE, 0);
| |
| - | gtk_container_add(GTK_CONTAINER(window), vbox);
| |
| - |
| |
| - |
| |
| - | toolbar = gtk_toolbar_new();
| |
| - | gtk_toolbar_set_style(GTK_TOOLBAR(toolbar), GTK_TOOLBAR_ICONS);
| |
| - |
| |
| - | gtk_container_set_border_width(GTK_CONTAINER(toolbar), 2);
| |
| - |
| |
| - | undo = gtk_tool_button_new_from_stock(GTK_STOCK_UNDO);
| |
| - | gtk_widget_set_name(GTK_WIDGET(undo), "undo");
| |
| - | gtk_toolbar_insert(GTK_TOOLBAR(toolbar), undo, -1);
| |
| - |
| |
| - | redo = gtk_tool_button_new_from_stock(GTK_STOCK_REDO);
| |
| - | gtk_toolbar_insert(GTK_TOOLBAR(toolbar), redo, -1);
| |
| - |
| |
| - | sep = gtk_separator_tool_item_new();
| |
| - | gtk_toolbar_insert(GTK_TOOLBAR(toolbar), sep, -1);
| |
| - |
| |
| - | exit = gtk_tool_button_new_from_stock(GTK_STOCK_QUIT);
| |
| - | gtk_toolbar_insert(GTK_TOOLBAR(toolbar), exit, -1);
| |
| - |
| |
| - | gtk_box_pack_start(GTK_BOX(vbox), toolbar, FALSE, FALSE, 5);
| |
| - |
| |
| - |
| |
| - | g_signal_connect(G_OBJECT(undo), "clicked",
| |
| - | G_CALLBACK(undo_redo), redo);
| |
| - |
| |
| - | g_signal_connect(G_OBJECT(redo), "clicked",
| |
| - | G_CALLBACK(undo_redo), undo);
| |
| - |
| |
| - | g_signal_connect(G_OBJECT(exit), "clicked",
| |
| - | G_CALLBACK(gtk_main_quit), NULL);
| |
| - |
| |
| - | g_signal_connect_swapped(G_OBJECT(window), "destroy",
| |
| - | G_CALLBACK(gtk_main_quit), NULL);
| |
| - |
| |
| - | gtk_widget_show_all(window);
| |
| - |
| |
| - | gtk_main();
| |
| - |
| |
| - | return 0;
| |
| - | }
| |
| - | </source>
| |
| - |
| |
| - | Our example creates undo and redo buttons from the GTK+ stock resources. After several clicks each of the buttons is inactivated. The buttons are grayed out.
| |
| - |
| |
| - | <source lang="cpp">
| |
| - | if (count < 0) {
| |
| - | gtk_widget_set_sensitive(widget, FALSE);
| |
| - | gtk_widget_set_sensitive(item, TRUE);
| |
| - | }
| |
| - |
| |
| - | if (count > 5) {
| |
| - | gtk_widget_set_sensitive(widget, FALSE);
| |
| - | gtk_widget_set_sensitive(item, TRUE);
| |
| - | }
| |
| - | </source>
| |
| - |
| |
| - | The <b>gtk_widget_set_sensitive()</b> function call is used to activate/inactivate the toolbar buttons.
| |
| - |
| |
| - | [[image: gtk_faq_undoredo.png | center]]
| |
| - |
| |
| - | [[Категория:GTK+]]
| |
