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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"><HTML><HEAD><TITLE>Scribble</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="GtkDial"HREF="x2859.html"><LINKREL="NEXT"TITLE="术语表"HREF="c2878.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="x2859.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="c2878.html"ACCESSKEY="N">Next >>></A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="SEC-SCRIBBLE">Scribble</H1><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="AEN2872">scribble-simple.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 <gtk/gtk.h>/* 绘制区的后端位图 */ static GdkPixmap *pixmap = NULL;/* 创建一个适当大小的后端位图 */static gint configure_event( GtkWidget *widget, GdkEventConfigure *event ){ if (pixmap) g_object_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;}/* 从后端位图重新绘制屏幕 */static gint expose_event( GtkWidget *widget, GdkEventExpose *event ){ gdk_draw_drawable (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;}/* 在屏幕上绘制一个矩形 */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_queue_draw_area (widget, update_rect.x, update_rect.y, update_rect.width, update_rect.height);}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 (){ 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); g_signal_connect (G_OBJECT (window), "destroy", G_CALLBACK (quit), NULL); /* 创建绘图区 */ drawing_area = gtk_drawing_area_new (); gtk_widget_set_size_request (GTK_WIDGET (drawing_area), 200, 200); gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0); gtk_widget_show (drawing_area); /* 用于处理后端位图的信号 */ g_signal_connect (G_OBJECT (drawing_area), "expose_event", G_CALLBACK (expose_event), NULL); g_signal_connect (G_OBJECT (drawing_area),"configure_event", G_CALLBACK (configure_event), NULL); /* 事件信号 */ g_signal_connect (G_OBJECT (drawing_area), "motion_notify_event", G_CALLBACK (motion_notify_event), NULL); g_signal_connect (G_OBJECT (drawing_area), "button_press_event", G_CALLBACK (button_press_event), NULL); gtk_widget_set_events (drawing_area, GDK_EXPOSURE_MASK | GDK_LEAVE_NOTIFY_MASK | GDK_BUTTON_PRESS_MASK | GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK); /* 退出按钮 */ button = gtk_button_new_with_label ("Quit"); gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0); g_signal_connect_swapped (G_OBJECT (button), "clicked", G_CALLBACK (gtk_widget_destroy), window); gtk_widget_show (button); gtk_widget_show (window); gtk_main (); return 0;}</PRE></TD></TR></TABLE></DIV><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="AEN2875">scribble-xinput.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 <gtk/gtk.h>/* 绘制区的后端位图 */static GdkPixmap *pixmap = NULL;/* 创建一个适当大小的后端位图 */static gintconfigure_event (GtkWidget *widget, GdkEventConfigure *event){ if (pixmap) g_object_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;}/* 从后端位图重新绘制屏幕 */static gintexpose_event (GtkWidget *widget, GdkEventExpose *event){ gdk_draw_drawable (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;}/* 在屏幕上画一个矩形，大小依据压力，颜色依据设备的类型 */static voiddraw_brush (GtkWidget *widget, GdkInputSource source, gdouble x, gdouble y, gdouble pressure){ GdkGC *gc; GdkRectangle update_rect; switch (source) { case GDK_SOURCE_MOUSE: gc = widget->style->dark_gc[GTK_WIDGET_STATE (widget)]; break; case GDK_SOURCE_PEN: gc = widget->style->black_gc; break; case GDK_SOURCE_ERASER: gc = widget->style->white_gc; break; default: gc = widget->style->light_gc[GTK_WIDGET_STATE (widget)]; } update_rect.x = x - 10 * pressure; update_rect.y = y - 10 * pressure; update_rect.width = 20 * pressure; update_rect.height = 20 * pressure; gdk_draw_rectangle (pixmap, gc, TRUE, update_rect.x, update_rect.y, update_rect.width, update_rect.height); gtk_widget_queue_draw_area (widget, update_rect.x, update_rect.y, update_rect.width, update_rect.height);}static voidprint_button_press (GdkDevice *device){ g_print ("Button press on device '%s'\n", device->name);}static gintbutton_press_event (GtkWidget *widget, GdkEventButton *event){ print_button_press (event->device); if (event->button == 1 && pixmap != NULL) { gdouble pressure; gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure); draw_brush (widget, event->device->source, event->x, event->y, pressure); } return TRUE;}static gintmotion_notify_event (GtkWidget *widget, GdkEventMotion *event){ gdouble x, y; gdouble pressure; GdkModifierType state; if (event->is_hint) { gdk_device_get_state (event->device, event->window, NULL, &state); gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_X, &x); gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_Y, &y); gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure); } else { x = event->x; y = event->y; gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure); state = event->state; } if (state & GDK_BUTTON1_MASK && pixmap != NULL) draw_brush (widget, event->device->source, x, y, pressure); return TRUE;}voidinput_dialog_destroy (GtkWidget *w, gpointer data){ *((GtkWidget **)data) = NULL;}voidcreate_input_dialog (){ static GtkWidget *inputd = NULL; if (!inputd) { inputd = gtk_input_dialog_new(); g_signal_connect (G_OBJECT (inputd), "destroy", G_CALLBACK (input_dialog_destroy), &inputd); g_signal_connect_swapped (G_OBJECT (GTK_INPUT_DIALOG (inputd)->close_button), "clicked", G_CALLBACK (gtk_widget_hide), inputd); gtk_widget_hide (GTK_INPUT_DIALOG (inputd)->save_button); gtk_widget_show (inputd); } else { if (!GTK_WIDGET_MAPPED (inputd)) gtk_widget_show (inputd); else gdk_window_raise (inputd->window); }}voidquit (){ exit (0);}intmain (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); g_signal_connect (G_OBJECT (window), "destroy", G_CALLBACK (quit), NULL); /* 创建绘图区 */ drawing_area = gtk_drawing_area_new (); gtk_widget_set_size_request (GTK_WIDGET (drawing_area), 200, 200); gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0); gtk_widget_show (drawing_area); /* 用于处理后端位图的信号 */ g_signal_connect (G_OBJECT (drawing_area), "expose_event", G_CALLBACK (expose_event), NULL); g_signal_connect (G_OBJECT(drawing_area),"configure_event", G_CALLBACK (configure_event), NULL); /* 事件信号 */ g_signal_connect (G_OBJECT (drawing_area), "motion_notify_event", G_CALLBACK (motion_notify_event), NULL); g_signal_connect (G_OBJECT (drawing_area), "button_press_event", G_CALLBACK (button_press_event), NULL); gtk_widget_set_events (drawing_area, GDK_EXPOSURE_MASK | GDK_LEAVE_NOTIFY_MASK | GDK_BUTTON_PRESS_MASK | GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK); /* 下面的调用允许为绘图区跟踪和处理扩展事件 */ gtk_widget_set_extension_events (drawing_area, GDK_EXTENSION_EVENTS_CURSOR); /* 几个按钮 */ button = gtk_button_new_with_label ("Input Dialog"); gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0); g_signal_connect (G_OBJECT (button), "clicked", G_CALLBACK (create_input_dialog), NULL); gtk_widget_show (button); button = gtk_button_new_with_label ("Quit"); gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0); g_signal_connect_swapped (G_OBJECT (button), "clicked", G_CALLBACK (gtk_widget_destroy), window); gtk_widget_show (button); gtk_widget_show (window); gtk_main (); return 0;}</PRE></TD></TR></TABLE></DIV></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="x2859.html"ACCESSKEY="P"><<< Previous</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="book1.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="c2878.html"ACCESSKEY="N">Next >>></A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">GtkDial</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="a2845.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">术语表</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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