GTK-drag any button in the window

1. Drag any button in the window

Source code:

# Include <GTK/GTK. h> <br/> gtkwidget * window; <br/> gtkwidget * fixed; <br/> gtkwidget * button; <br/> gboolean drag = false; // drag the form only when the left button is pressed </P> <p> Gint Nx = 0; <br/> Gint ny = 0; </P> <p> void destroy (gtkwidget * widget, gpointer * Data) <br/>{< br/> gtk_main_quit (); <br/>}</P> <p> static Gint button_press_event (gtkwidget * widget, gdkeventbutton * event, gpointer data) <br/>{< br/> If (Event-> button = 1) // determine whether to press the left button <br/>{< br/> drag = true; <br/> Nx = event-> X; // obtain the cursor position relative to the window. <br/> ny = event-> Y; <br/>}</P> <p> return true; </P> <p >}< br/> static Gint button_release_event (gtkwidget * widget, gdkeventbutton * event, gpointer data) // The Mouse up event <br/>{</P> <p> If (Event-> button = 1) // press the left mouse button for the second time <br/> drag = false; </P> <p> // gtk_fixed_move (gtk_fixed (fixed), button, event-> X, event-> Y);/* move the button */<br/> return true; </P> <p >}</P> <p> static Gint motion_policy_event (gtkwidget * widget, gdkeventbutton * event, gpointer data) // move the cursor over the event <br/>{</P> <p> If (drag) <br/>{< br/> // Gint X, Y; <br/> // gtkwidget * window = (gtkwidget *) data; <br/> // gtk_window_get_position (gtkwindow *) window, & X, & Y ); // obtain the absolute coordinates of the form<Br/> gtk_fixed_move (gtk_fixed (fixed), button, widget-> allocation. X + Event-> X-NX, widget-> allocation. X + Event-> Y-NY);/* move the button */<br/> // g_print ("x = % d; y = % d \ n ", X + Event-> X-NX, Y + Event-> Y-NY); <br/> // gtk_fixed_move (gtk_fixed (fixed), button, event-> X, event-> Y);/* move the button */<br/> // gtk_window_move (gtkwindow *) window, x + Event-> X-NX, Y + Event-> Y-NY); // move the form <br/>}</P> <p> return true; </P> <p >}</P> <p> int main (INT argc, char * argv []) <br/>{</P> <p> gtk_init (& argc, & argv); // initialization <br/> window = gtk_window_new (gtk_window_toplevel); <br/> gtk_signal_connect (gtk_object (window), "Destroy", (gtksignalfunc) destroy, null); <br/> gtk_window_set_title (gtk_window (window), "button_drag"); <br/> // gtk_window_fullscreen (gtk_window )); </P> <p> fixed = gtk_fixed_new (); // function used to create a new fixed container <br/> gtk_con Tainer_add (gtk_container (window), fixed); </P> <p> button = gtk_button_new_with_label ("button "); /* Create a button with a label */<br/> // gtk_container_add (gtk_container (window), button ); /* Add the button to the form */<br/> gtk_fixed_put (gtk_fixed (fixed), button, 50, 50 ); // The function places the widget in the position specified by x and y in fixed. <Br/> gtk_widget_set_size_request (button, 80, 35); </P> <p> // set the button to get the mouse event <br/> gtk_widget_set_events (button, response | response | gdk_button_press_mask | response); <br/> gtk_signal_connect (gtk_object (button), "button_press_event", (gtksignalfunc) button_press_event, window ); // Add Event Callback <br/> gtk_signal_connect (gtk_object (button), "button_release_event", (gtksignalfunc) button_release_event, window); <br/> gtk_signal_connect (gtk_object (button ), "motion_policy_event", (gtksignalfunc) motion_policy_event, window); </P> <p> gtk_widget_show_all (window); <br/> gtk_main (); <br/> return 0; <br/>}