下面演示了如何在窗口中增加一個按鈕，示例代碼均有注釋

#include <gtk/gtk.h>static void print_hello (GtkWidget *widget,gpointer data){//這是一個回調(diào)函數(shù)，這個data表示傳給回調(diào)函數(shù)的參數(shù)。g_print ("你好，世界\n");}static gboolean on_delete_event (GtkWidget *widget,GdkEvent *event,gpointer data){//如果返回FALSE在delete_event信號處理中，GTK將發(fā)送destroy信號，否則不會，這樣窗口就不會關(guān)閉。g_print ("delete event occurred\n");return TRUE;}int main (int argc,char *argv[]){GtkWidget *window;GtkWidget *button;//初始化gtk應(yīng)用程序gtk_init (&argc, &argv);//創(chuàng)造新的窗口，設(shè)置它的標(biāo)題window = gtk_window_new (GTK_WINDOW_TOPLEVEL);gtk_window_set_title (GTK_WINDOW (window), "你好");//將delete_event信號綁定在on_delte_devent回調(diào)函數(shù)上，傳遞的參數(shù)為NULLg_signal_connect (window, "delete-event", G_CALLBACK (on_delete_event), NULL);//將destroy信號綁定在gtk_main_quit回調(diào)函數(shù)上，傳遞的參數(shù)為NULLg_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);//設(shè)置窗口的邊框?qū)挾萭tk_container_set_border_width (GTK_CONTAINER (window), 10);//創(chuàng)建一個新的標(biāo)簽 button = gtk_button_new_with_label ("Hello World");//處理按鈕的clicked信號g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);//g_signal_connect_swapped將clicked信號連接到window窗口的gtk_widget_destroy事件中。g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);//將按鈕加入到容器中g(shù)tk_container_add (GTK_CONTAINER (window), button);//顯示這個按鈕gtk_widget_show (button);//顯示窗口gtk_widget_show (window);//開始GTK的主循環(huán)gtk_main ();return 0;}

在XMANGER下用VIM編寫好后，編譯運行

#include <gtk/gtk.h>/* Surface to store current scribbles */ static cairo_surface_t *surface = NULL;static void clear_surface (void) {cairo_t *cr;cr = cairo_create (surface);cairo_set_source_rgb (cr, 1, 1, 1);cairo_paint (cr);cairo_destroy (cr); }/* Create a new surface of the appropriate size to store our scribbles */ static gboolean configure_event_cb (GtkWidget *widget,GdkEventConfigure *event,gpointer data) {if (surface)cairo_surface_destroy (surface);surface = gdk_window_create_similar_surface (gtk_widget_get_window (widget),CAIRO_CONTENT_COLOR,gtk_widget_get_allocated_width (widget),gtk_widget_get_allocated_height (widget));/* Initialize the surface to white */clear_surface ();/* We've handled the configure event, no need for further processing. */return TRUE; }/* Redraw the screen from the surface. Note that the ::draw* signal receives a ready-to-be-used cairo_t that is already* clipped to only draw the exposed areas of the widget*/ static gboolean draw_cb (GtkWidget *widget,cairo_t *cr,gpointer data) {cairo_set_source_surface (cr, surface, 0, 0);cairo_paint (cr);return FALSE; }/* Draw a rectangle on the surface at the given position */ static void draw_brush (GtkWidget *widget,gdouble x,gdouble y) {cairo_t *cr;/* Paint to the surface, where we store our state */cr = cairo_create (surface);cairo_rectangle (cr, x - 3, y - 3, 6, 6);cairo_fill (cr);cairo_destroy (cr);/* Now invalidate the affected region of the drawing area. */gtk_widget_queue_draw_area (widget, x - 3, y - 3, 6, 6); }/* Handle button press events by either drawing a rectangle* or clearing the surface, depending on which button was pressed.* The ::button-press signal handler receives a GdkEventButton* struct which contains this information.*/ static gboolean button_press_event_cb (GtkWidget *widget,GdkEventButton *event,gpointer data) {/* paranoia check, in case we haven't gotten a configure event */if (surface == NULL)return FALSE;if (event->button == 1){draw_brush (widget, event->x, event->y);}else if (event->button == 3){clear_surface ();gtk_widget_queue_draw (widget);}/* We've handled the event, stop processing */return TRUE; }/* Handle motion events by continuing to draw if button 1 is* still held down. The ::motion-notify signal handler receives* a GdkEventMotion struct which contains this information.*/ static gboolean motion_notify_event_cb (GtkWidget *widget,GdkEventMotion *event,gpointer data) {int x, y;GdkModifierType state;/* paranoia check, in case we haven't gotten a configure event */if (surface == NULL)return FALSE;/* This call is very important; it requests the next motion event.* If you don't call gdk_window_get_pointer() you'll only get* a single motion event. The reason is that we specified* GDK_POINTER_MOTION_HINT_MASK to gtk_widget_set_events().* If we hadn't specified that, we could just use event->x, event->y* as the pointer location. But we'd also get deluged in events.* By requesting the next event as we handle the current one,* we avoid getting a huge number of events faster than we* can cope.*/gdk_window_get_pointer (event->window, &x, &y, &state);if (state & GDK_BUTTON1_MASK)draw_brush (widget, x, y);/* We've handled it, stop processing */return TRUE; }static void close_window (void) {if (surface)cairo_surface_destroy (surface);gtk_main_quit (); }int main (int argc,char *argv[]) {GtkWidget *window;GtkWidget *frame;GtkWidget *da;gtk_init (&argc, &argv);window = gtk_window_new (GTK_WINDOW_TOPLEVEL);gtk_window_set_title (GTK_WINDOW (window), "Drawing Area");g_signal_connect (window, "destroy", G_CALLBACK (close_window), NULL);gtk_container_set_border_width (GTK_CONTAINER (window), 8);frame = gtk_frame_new (NULL);gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);gtk_container_add (GTK_CONTAINER (window), frame);da = gtk_drawing_area_new ();/* set a minimum size */gtk_widget_set_size_request (da, 100, 100);gtk_container_add (GTK_CONTAINER (frame), da);/* Signals used to handle the backing surface */g_signal_connect (da, "draw",G_CALLBACK (draw_cb), NULL);g_signal_connect (da,"configure-event",G_CALLBACK (configure_event_cb), NULL);/* Event signals */g_signal_connect (da, "motion-notify-event",G_CALLBACK (motion_notify_event_cb), NULL);g_signal_connect (da, "button-press-event",G_CALLBACK (button_press_event_cb), NULL);/* Ask to receive events the drawing area doesn't normally* subscribe to. In particular, we need to ask for the* button press and motion notify events that want to handle.*/gtk_widget_set_events (da, gtk_widget_get_events (da)| GDK_BUTTON_PRESS_MASK| GDK_POINTER_MOTION_MASK| GDK_POINTER_MOTION_HINT_MASK);gtk_widget_show_all (window);gtk_main ();return 0; }

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