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<HTML><HEAD><TITLE>Scribble</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="GtkDial"HREF="sec-gtkdial.html"><LINKREL="NEXT"TITLE="List Widget"HREF="app-listwidget.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="sec-gtkdial.html"><<< Previous</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom">Appendix C. Code Examples</TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="app-listwidget.html">Next >>></A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="SEC-SCRIBBLE">C.3. Scribble</A></H1><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="AEN3295">C.3.1. scribble-simple.c</A></H2><TABLEBORDER="0"BGCOLOR="#E0E0E0"WIDTH="100%"><TR><TD><PRECLASS="PROGRAMLISTING">/* example-start scribble-simple scribble-simple.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 <gtk/gtk.h>/* Backing pixmap for drawing area */static GdkPixmap *pixmap = NULL;/* Create a new backing pixmap of the appropriate size */static gint configure_event( GtkWidget *widget, GdkEventConfigure *event ){ if (pixmap) gdk_pixmap_unref(pixmap); pixmap = gdk_pixmap_new(widget->window, widget->allocation.width, widget->allocation.height, -1); gdk_draw_rectangle (pixmap, widget->style->white_gc, TRUE, 0, 0, widget->allocation.width, widget->allocation.height); return TRUE;}/* Redraw the screen from the backing pixmap */static gint expose_event( GtkWidget *widget, GdkEventExpose *event ){ gdk_draw_pixmap(widget->window, widget->style->fg_gc[GTK_WIDGET_STATE (widget)], pixmap, event->area.x, event->area.y, event->area.x, event->area.y, event->area.width, event->area.height); return FALSE;}/* Draw a rectangle on the screen */static void draw_brush( GtkWidget *widget, gdouble x, gdouble y){ GdkRectangle update_rect; update_rect.x = x - 5; update_rect.y = y - 5; update_rect.width = 10; update_rect.height = 10; gdk_draw_rectangle (pixmap, widget->style->black_gc, TRUE, update_rect.x, update_rect.y, update_rect.width, update_rect.height); gtk_widget_draw (widget, &update_rect);}static gint button_press_event( GtkWidget *widget, GdkEventButton *event ){ if (event->button == 1 && pixmap != NULL) draw_brush (widget, event->x, event->y); return TRUE;}static gint motion_notify_event( GtkWidget *widget, GdkEventMotion *event ){ int x, y; GdkModifierType state; if (event->is_hint) gdk_window_get_pointer (event->window, &x, &y, &state); else { x = event->x; y = event->y; state = event->state; } if (state & GDK_BUTTON1_MASK && pixmap != NULL) draw_brush (widget, x, y); return TRUE;}void quit (){ gtk_exit (0);}int main( int argc, char *argv[] ){ GtkWidget *window; GtkWidget *drawing_area; GtkWidget *vbox; GtkWidget *button; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_widget_set_name (window, "Test Input"); vbox = gtk_vbox_new (FALSE, 0); gtk_container_add (GTK_CONTAINER (window), vbox); gtk_widget_show (vbox); gtk_signal_connect (GTK_OBJECT (window), "destroy", GTK_SIGNAL_FUNC (quit), NULL); /* Create the drawing area */ drawing_area = gtk_drawing_area_new (); gtk_drawing_area_size (GTK_DRAWING_AREA (drawing_area), 200, 200); gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0); gtk_widget_show (drawing_area); /* Signals used to handle backing pixmap */ gtk_signal_connect (GTK_OBJECT (drawing_area), "expose_event", (GtkSignalFunc) expose_event, NULL); gtk_signal_connect (GTK_OBJECT(drawing_area),"configure_event", (GtkSignalFunc) configure_event, NULL); /* Event signals */ gtk_signal_connect (GTK_OBJECT (drawing_area), "motion_notify_event", (GtkSignalFunc) motion_notify_event, NULL);⌨️ 快捷键说明
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