ruler.c

《Linux程序设计权威指南》源代码

	/* File: ruler.c */

	#include <gtk/gtk.h>

	#define EVENT_METHOD(i, x) GTK_WIDGET_CLASS(GTK_OBJECT(i)->klass)->x
	#define XSIZE  600
	#define YSIZE  400

	gint close_application( GtkWidget *widget,
		GdkEvent  *event, gpointer   data )
	{
		gtk_main_quit();
		return(FALSE);
	}


	int main( int   argc, char *argv[] ) 
	{ 
		GtkWidget *window, *table, *area, *hrule, *vrule;

		//初始化
		gtk_set_locale();
		gtk_init( &argc, &argv );

		window = gtk_window_new( GTK_WINDOW_TOPLEVEL );
		gtk_signal_connect (GTK_OBJECT (window), "delete_event",
			GTK_SIGNAL_FUNC( close_application ), NULL);
		gtk_container_set_border_width (GTK_CONTAINER (window), 10);

		//建立三行两列的表格容器
		table = gtk_table_new( 3, 2, FALSE );
		gtk_container_add( GTK_CONTAINER(window), table );

		area = gtk_drawing_area_new();
		gtk_drawing_area_size( (GtkDrawingArea *)area, XSIZE, YSIZE );
		gtk_table_attach( GTK_TABLE(table), area, 1, 2, 1, 2,
			GTK_EXPAND|GTK_FILL, GTK_FILL, 0, 0 );
		gtk_widget_set_events( area, GDK_POINTER_MOTION_MASK |
			GDK_POINTER_MOTION_HINT_MASK );

		//建立水平标尺
		hrule = gtk_hruler_new();
		gtk_ruler_set_metric( GTK_RULER(hrule), GTK_PIXELS );
		gtk_ruler_set_range( GTK_RULER(hrule), 7, 13, 0, 20 );
		gtk_signal_connect_object( GTK_OBJECT(area), 
			"motion_notify_event",
			(GtkSignalFunc)EVENT_METHOD(hrule, motion_notify_event),			GTK_OBJECT(hrule) );
		gtk_table_attach( GTK_TABLE(table), hrule, 1, 2, 0, 1,
			GTK_EXPAND|GTK_SHRINK|GTK_FILL, GTK_FILL, 0, 0 );
     
		//建立垂直标尺
		vrule = gtk_vruler_new();
		gtk_ruler_set_metric( GTK_RULER(vrule), GTK_PIXELS );
		gtk_ruler_set_range( GTK_RULER(vrule), 0, YSIZE, 10, YSIZE );
		gtk_signal_connect_object( GTK_OBJECT(area),
			"motion_notify_event", (GtkSignalFunc)
			GTK_WIDGET_CLASS(GTK_OBJECT(vrule)->klass)->
			motion_notify_event, GTK_OBJECT(vrule) );
		gtk_table_attach( GTK_TABLE(table), vrule, 0, 1, 1, 2,
			GTK_FILL, GTK_EXPAND|GTK_SHRINK|GTK_FILL, 0, 0 );

		gtk_widget_show( area );
		gtk_widget_show( hrule );
		gtk_widget_show( vrule );
		gtk_widget_show( table );
		gtk_widget_show( window );
		gtk_main();

		return(0);
	}