📄 sec-gtkdial.html
字号:
<HTML><HEAD><TITLE>GtkDial</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.49"><LINKREL="HOME"TITLE="GTK+ 1.2 Tutorial"HREF="gtk-tut.html"><LINKREL="UP"TITLE="Code Examples"HREF="app-codeexamples.html"><LINKREL="PREVIOUS"TITLE="Code Examples"HREF="app-codeexamples.html"><LINKREL="NEXT"TITLE="Scribble"HREF="sec-scribble.html"></HEAD></head><body bgcolor="#FFFFFF" marginheight=0 marginwidth=0 width="100%"><table cellspacing=6 border=0 cellpadding=0 width="100%"> <tr> <td bgcolor="#FFFFFF" valign=top nowrap> <centeR><A HREF="/"><img src="/images/gtk-logo-rgb.gif" width=107 height=140 border=0></A> <font face="helvetica,lucidia" color="#000000"><BR><BR><b>GTK+<BR>The GIMP Toolkit</b></center><BR><table width=100% cellspacing=0 cellpadding=2 border=0><tr><td bgcolor="#000000"><table width=100% cellspacing=0 cellpadding=4 border=0><tr><td bgcolor="#AAAAEE" nowrap><B>General</B></td></tr><tr><td bgcolor="#FFFFFF" nowrap><A HREF="/">Introduction</A><BR><A HREF="/screenshots/">Screenshots</A><br><A HREF="/download/">Download</A><br><A HREF="/mailinglists.html">Mailing Lists</A><BR><A HREF="/bindings.html">Language Bindings</A><BR><A HREF="http://gtk.themes.org/">Themes</A><BR><A HREF="/bugs.html">Bug Tracker</A><BR></td></tr></table></td></tr></table><BR> <table width=100% cellspacing=0 cellpadding=2 border=0><tr><td bgcolor="#000000"><table width=100% cellspacing=0 cellpadding=4 border=0><tr><td bgcolor="#AAAAEE" nowrap><B>Documentation</B></td></tr><tr><td bgcolor="#FFFFFF" nowrap><A HREF="/faq/">FAQ</A><br><A HREF="/tutorial/">Tutorial</A><BR><A HREF="/api/">API Reference</A><br><A HREF="/books.html">Published Books</A><BR></td></tr></table></td></tr></table><BR> <table width=100% cellspacing=0 cellpadding=2 border=0><tr><td bgcolor="#000000"><table width=100% cellspacing=0 cellpadding=4 border=0><tr><td bgcolor="#AAAAEE" nowrap><B>Projects</B></td></tr><tr><td bgcolor="#FFFFFF" nowrap><A HREF="http://www.pango.org/">Pango</A><BR><A HREF="http://sources.redhat.com/inti/">Inti</A><BR><A HREF="http://www.gnome.org/">GNOME</A><BR><A HREF="http://user.sgic.fi/~tml/gimp/win32/">GTK+ for Win32</A><br><A HREF="http://people.redhat.com/sopwith/gtkfb/">GtkFB (Framebuffer)</A><br><A HREF="http://www.directfb.org/gtk.xml">GTK+ on DirectFB</A><BR><A HREF="/beos/">GTK+ for BeOS</A></td></tr></table></td></tr></table><BR> <table width=100% cellspacing=0 cellpadding=2 border=0><tr><td bgcolor="#000000"><table width=100% cellspacing=0 cellpadding=4 border=0><tr><td bgcolor="#AAAAEE" nowrap><B><B>Applications</B></B></td></tr><tr><td bgcolor="#FFFFFF" nowrap><A HREF="http://www.gimp.org/">GIMP</A><BR><A HREF="http://www.abiword.org/">Abiword</A><BR><A HREF="http://www.lysator.liu.se/~alla/dia/dia.html">Dia</A><BR><A HREF="http://glade.pn.org/">Glade</A><BR><A HREF="http://www.gnucash.org/">GnuCash</A><BR><A HREF="http://www.gnome.org/projects/gnumeric/">Gnumeric</A><BR><BR><A HREF="http://www.gnome.org/applist/">GNOME Software Map</A><br></td></tr></table></td></tr></table><BR> </td> <td bgcolor="#ffffff" valign=top width="99%"><font face="lucida,helvetica"><BODYCLASS="SECT1"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLEWIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">GTK+ 1.2 Tutorial</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="app-codeexamples.html"><<< Previous</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom">Appendix C. Code Examples</TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="sec-scribble.html">Next >>></A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="SEC-GTKDIAL">C.2. GtkDial</A></H1><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="AEN3284">C.2.1. gtkdial.h</A></H2><TABLEBORDER="0"BGCOLOR="#E0E0E0"WIDTH="100%"><TR><TD><PRECLASS="PROGRAMLISTING">/* example-start gtkdial gtkdial.h *//* GTK - The GIMP Toolkit * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * 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; /* update policy (GTK_UPDATE_[CONTINUOUS/DELAYED/DISCONTINUOUS]) */ guint policy : 2; /* Button currently pressed or 0 if none */ guint8 button; /* Dimensions of dial components */ gint radius; gint pointer_width; /* ID of update timer, or 0 if none */ guint32 timer; /* Current angle */ gfloat angle; gfloat last_angle; /* Old values from adjustment stored so we know when something changes */ gfloat old_value; gfloat old_lower; gfloat old_upper; /* The adjustment object that stores the data for this dial */ GtkAdjustment *adjustment;};struct _GtkDialClass{ GtkWidgetClass parent_class;};GtkWidget* gtk_dial_new (GtkAdjustment *adjustment);guint 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__ *//* example-end */</PRE></TD></TR></TABLE></DIV><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="AEN3287">C.2.2. gtkdial.c</A></H2><TABLEBORDER="0"BGCOLOR="#E0E0E0"WIDTH="100%"><TR><TD><PRECLASS="PROGRAMLISTING">/* example-start gtkdial gtkdial.c *//* GTK - The GIMP Toolkit * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * 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/* Forward declarations */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);/* Local data */static GtkWidgetClass *parent_class = NULL;guintgtk_dial_get_type (){ static guint dial_type = 0; if (!dial_type) { GtkTypeInfo dial_info = { "GtkDial", sizeof (GtkDial), sizeof (GtkDialClass), (GtkClassInitFunc) gtk_dial_class_init, (GtkObjectInitFunc) gtk_dial_init, (GtkArgSetFunc) NULL, (GtkArgGetFunc) NULL, }; dial_type = gtk_type_unique (gtk_widget_get_type (), &dial_info); } 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 = gtk_type_new (gtk_dial_get_type ()); 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) gtk_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) { gtk_signal_disconnect_by_data (GTK_OBJECT (dial->adjustment), (gpointer) dial); gtk_object_unref (GTK_OBJECT (dial->adjustment)); } dial->adjustment = adjustment; gtk_object_ref (GTK_OBJECT (dial->adjustment)); gtk_signal_connect (GTK_OBJECT (adjustment), "changed", (GtkSignalFunc) gtk_dial_adjustment_changed, (gpointer) dial); gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed", (GtkSignalFunc) 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);⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -