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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"><HTML><HEAD><TITLE>GtkDial</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="GTK+ 2.0 教程"HREF="book1.html"><LINKREL="UP"TITLE="示例程序代码"HREF="a2845.html"><LINKREL="PREVIOUS"TITLE="示例程序代码"HREF="a2845.html"><LINKREL="NEXT"TITLE="Scribble"HREF="x2870.html"></HEAD><BODYCLASS="SECT1"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">GTK+ 2.0 教程</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="a2845.html"ACCESSKEY="P"><<< Previous</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom">示例程序代码</TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="x2870.html"ACCESSKEY="N">Next >>></A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="SEC-GTKDIAL">GtkDial</H1><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="AEN2861">gtkdial.h</H2><TABLEBORDER="0"BGCOLOR="#E0E0E0"WIDTH="100%"><TR><TD><PRECLASS="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 __cplusplusextern "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></TD></TR></TABLE></DIV><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="AEN2864">gtkdial.c</H2><TABLEBORDER="0"BGCOLOR="#E0E0E0"WIDTH="100%"><TR><TD><PRECLASS="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;GTypegtk_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 voidgtk_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 voidgtk_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 voidgtk_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;}voidgtk_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;}voidgtk_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 voidgtk_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 voidgtk_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 gintgtk_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;⌨️ 快捷键说明
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