gtk入门案例程序gtk的各种控件的使用案

/* GTK - GIMP工具包 * 版权 (C) 1995-1997 Peter Mattis, Spencer Kimball 和 Josh MacDonald 所有 * * 本程序是自由软件。你可以在自由软件基金发布的 GNU GPL 的条款下重新分发 * 或修改它。GPL 可以使用版本 2 或(由你选择)任何随后的版本。 * * 本程序分发的目的是它可能对其他人有用，但不提供任何的担保，包括隐含的 * 和适合特定用途的保证。请查阅GNU通用公共许可证获得详细的信息。 * * 你应该已经随该软件一起收到一份GNU通用公共许可。如果还没有，请写信给 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #include <math.h> #include <stdio.h> #include <gtk/gtkmain.h> #include <gtk/gtksignal.h> #include "gtkdial.h" #define SCROLL_DELAY_LENGTH 300 #define DIAL_DEFAULT_SIZE 100 /* 声明 */ static void gtk_dial_class_init (GtkDialClass *klass); static void gtk_dial_init (GtkDial *dial); static void gtk_dial_destroy (GtkObject *object); static void gtk_dial_realize (GtkWidget *widget); static void gtk_dial_size_request (GtkWidget *widget, GtkRequisition *requisition); static void gtk_dial_size_allocate (GtkWidget *widget, GtkAllocation *allocation); static gint gtk_dial_expose (GtkWidget *widget, GdkEventExpose *event); static gint gtk_dial_button_press (GtkWidget *widget, GdkEventButton *event); static gint gtk_dial_button_release (GtkWidget *widget, GdkEventButton *event); static gint gtk_dial_motion_notify (GtkWidget *widget, GdkEventMotion *event); static gint gtk_dial_timer (GtkDial *dial); static void gtk_dial_update_mouse (GtkDial *dial, gint x, gint y); static void gtk_dial_update (GtkDial *dial); static void gtk_dial_adjustment_changed (GtkAdjustment *adjustment, gpointer data); static void gtk_dial_adjustment_value_changed (GtkAdjustment *adjustment, gpointer data); /* 局部数据 */ static GtkWidgetClass *parent_class = NULL; GType gtk_dial_get_type () { static GType dial_type = 0; if (!dial_type) { static const GTypeInfo dial_info = { sizeof (GtkDialClass), NULL, NULL, (GClassInitFunc) gtk_dial_class_init, NULL, NULL, sizeof (GtkDial), 0, (GInstanceInitFunc) gtk_dial_init, }; dial_type = g_type_register_static (GTK_TYPE_WIDGET, "GtkDial", &dial_info, 0); } return dial_type; } static void gtk_dial_class_init (GtkDialClass *class) { GtkObjectClass *object_class; GtkWidgetClass *widget_class; object_class = (GtkObjectClass*) class; widget_class = (GtkWidgetClass*) class; parent_class = gtk_type_class (gtk_widget_get_type ()); object_class->destroy = gtk_dial_destroy; widget_class->realize = gtk_dial_realize; widget_class->expose_event = gtk_dial_expose; widget_class->size_request = gtk_dial_size_request; widget_class->size_allocate = gtk_dial_size_allocate; widget_class->button_press_event = gtk_dial_button_press; widget_class->button_release_event = gtk_dial_button_release; widget_class->motion_notify_event = gtk_dial_motion_notify; } static void gtk_dial_init (GtkDial *dial) { dial->button = 0; dial->policy = GTK_UPDATE_CONTINUOUS; dial->timer = 0; dial->radius = 0; dial->pointer_width = 0; dial->angle = 0.0; dial->old_value = 0.0; dial->old_lower = 0.0; dial->old_upper = 0.0; dial->adjustment = NULL; } GtkWidget* gtk_dial_new (GtkAdjustment *adjustment) { GtkDial *dial; dial = g_object_new (gtk_dial_get_type (), NULL); if (!adjustment) adjustment = (GtkAdjustment*) gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0); gtk_dial_set_adjustment (dial, adjustment); return GTK_WIDGET (dial); } static void gtk_dial_destroy (GtkObject *object) { GtkDial *dial; g_return_if_fail (object != NULL); g_return_if_fail (GTK_IS_DIAL (object)); dial = GTK_DIAL (object); if (dial->adjustment) g_object_unref (GTK_OBJECT (dial->adjustment)); if (GTK_OBJECT_CLASS (parent_class)->destroy) (* GTK_OBJECT_CLASS (parent_class)->destroy) (object); } GtkAdjustment* gtk_dial_get_adjustment (GtkDial *dial) { g_return_val_if_fail (dial != NULL, NULL); g_return_val_if_fail (GTK_IS_DIAL (dial), NULL); return dial->adjustment; } void gtk_dial_set_update_policy (GtkDial *dial, GtkUpdateType policy) { g_return_if_fail (dial != NULL); g_return_if_fail (GTK_IS_DIAL (dial)); dial->policy = policy; } void gtk_dial_set_adjustment (GtkDial *dial, GtkAdjustment *adjustment) { g_return_if_fail (dial != NULL); g_return_if_fail (GTK_IS_DIAL (dial)); if (dial->adjustment) { g_signal_handlers_disconnect_by_func (GTK_OBJECT (dial->adjustment), NULL, (gpointer) dial); g_object_unref (GTK_OBJECT (dial->adjustment)); } dial->adjustment = adjustment; g_object_ref (GTK_OBJECT (dial->adjustment)); g_signal_connect (GTK_OBJECT (adjustment), "changed", GTK_SIGNAL_FUNC (gtk_dial_adjustment_changed), (gpointer) dial); g_signal_connect (GTK_OBJECT (adjustment), "value_changed", GTK_SIGNAL_FUNC (gtk_dial_adjustment_value_changed), (gpointer) dial); dial->old_value = adjustment->value; dial->old_lower = adjustment->lower; dial->old_upper = adjustment->upper; gtk_dial_update (dial); } static void gtk_dial_realize (GtkWidget *widget) { GtkDial *dial; GdkWindowAttr attributes; gint attributes_mask; g_return_if_fail (widget != NULL); g_return_if_fail (GTK_IS_DIAL (widget)); GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED); dial = GTK_DIAL (widget); attributes.x = widget->allocation.x; attributes.y = widget->allocation.y; attributes.width = widget->allocation.width; attributes.height = widget->allocation.height; attributes.wclass = GDK_INPUT_OUTPUT; attributes.window_type = GDK_WINDOW_CHILD; attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK; attributes.visual = gtk_widget_get_visual (widget); attributes.colormap = gtk_widget_get_colormap (widget); attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP; widget->window = gdk_window_new (widget->parent->window, &attributes, attributes_mask); widget->style = gtk_style_attach (widget->style, widget->window); gdk_window_set_user_data (widget->window, widget); gtk_style_set_background (widget->style, widget->window, GTK_STATE_ACTIVE); } static void gtk_dial_size_request (GtkWidget *widget, GtkRequisition *requisition) { requisition->width = DIAL_DEFAULT_SIZE; requisition->height = DIAL_DEFAULT_SIZE; } static void gtk_dial_size_allocate (GtkWidget *widget, GtkAllocation *allocation) { GtkDial *dial; g_return_if_fail (widget != NULL); g_return_if_fail (GTK_IS_DIAL (widget)); g_return_if_fail (allocation != NULL); widget->allocation = *allocation; dial = GTK_DIAL (widget); if (GTK_WIDGET_REALIZED (widget)) { gdk_window_move_resize (widget->window, allocation->x, allocation->y, allocation->width, allocation->height); } dial->radius = MIN (allocation->width, allocation->height) * 0.45; dial->pointer_width = dial->radius / 5; } static gint gtk_dial_expose (GtkWidget *widget, GdkEventExpose *event) { GtkDial *dial; GdkPoint points[6]; gdouble s,c; gdouble theta, last, increment; GtkStyle *blankstyle; gint xc, yc; gint upper, lower; gint tick_length; gint i, inc; g_return_val_if_fail (widget != NULL, FALSE); g_return_val_if_fail (GTK_IS_DIAL (widget), FALSE); g_return_val_if_fail (event != NULL, FALSE); if (event->count > 0) return FALSE; dial = GTK_DIAL (widget); /* gdk_window_clear_are