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NAME="SEC-GTKDIAL">GtkDial</H1
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NAME="AEN2861">gtkdial.h</H2
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CLASS="PROGRAMLISTING"
> /* 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.
*/
#ifndef __GTK_DIAL_H__
#define __GTK_DIAL_H__
#include <gdk/gdk.h>
#include <gtk/gtkadjustment.h>
#include <gtk/gtkwidget.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#define GTK_DIAL(obj) GTK_CHECK_CAST (obj, gtk_dial_get_type (), GtkDial)
#define GTK_DIAL_CLASS(klass) GTK_CHECK_CLASS_CAST (klass, gtk_dial_get_type (), GtkDialClass)
#define GTK_IS_DIAL(obj) GTK_CHECK_TYPE (obj, gtk_dial_get_type ())
typedef struct _GtkDial GtkDial;
typedef struct _GtkDialClass GtkDialClass;
struct _GtkDial
{
GtkWidget widget;
/* 更新方式 (GTK_UPDATE_[CONTINUOUS/DELAYED/DISCONTINUOUS]) */
guint policy : 2;
/* 当前按下的按钮，如果没有该值是 0 */
guint8 button;
/* 表盘指针的大小 */
gint radius;
gint pointer_width;
/* 更新计时器的ID , 如果没有该值是 0 */
guint32 timer;
/* 当前角度 */
gfloat angle;
gfloat last_angle;
/* 将从调整对象中得到的旧值保存起来，这样在改变时我们就会知道 */
gfloat old_value;
gfloat old_lower;
gfloat old_upper;
/* 为这个表盘构件存储数据的调整对象 */
GtkAdjustment *adjustment;
};
struct _GtkDialClass
{
GtkWidgetClass parent_class;
};
GtkWidget* gtk_dial_new (GtkAdjustment *adjustment);
GtkType gtk_dial_get_type (void);
GtkAdjustment* gtk_dial_get_adjustment (GtkDial *dial);
void gtk_dial_set_update_policy (GtkDial *dial,
GtkUpdateType policy);
void gtk_dial_set_adjustment (GtkDial *dial,
GtkAdjustment *adjustment);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __GTK_DIAL_H__ */</PRE
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CLASS="PROGRAMLISTING"
> /* 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_area (widget->window,
0, 0,
widget->allocation.width,
widget->allocation.height);
*/
xc = widget->allocation.width / 2;
yc = widget->allocation.height / 2;
upper = dial->adjustment->upper;
lower = dial->adjustment->lower;
/* Erase old pointer */
s = sin (dial->last_angle);
c = cos (dial->last_angle);
dial->last_angle = dial->angle;
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