// example-label.c
// gcc -Wall `pkg-config --cflags --libs gtk+-2.0` -o label-demo example-label.c

// This is the only header that you need for the basic gtk library
#include <gtk/gtk.h>
#include <sys/stat.h>

// This is used by the "drag-and-drop" interface
#define NDTYPE	1	// Number of "Drop Types"
static GtkTargetEntry dtype[NDTYPE] =
{	// Drop Types
	{ "text/uri-list", 0, 0 }
};
// prototype for "drag-and-drop" function
void DropFiles(GtkWidget*, GdkDragContext*,
	 int, int, GtkSelectionData*, int, int, GtkLabel**);

int main (int argc, char** argv)
{
	GtkWidget* mwin;	// Main Window
	GtkWidget* vbox;	// gonna pack widgets in this

	// wake the beast
	gtk_init (&argc, &argv);
	// create the window
	mwin = gtk_window_new (GTK_WINDOW_TOPLEVEL);
	// obvious API functions
	gtk_window_set_title ((GtkWindow*)mwin, "Label-Demo");
	gtk_container_set_border_width ((GtkContainer*)mwin, 2);
	// center on screen
	gtk_window_set_position ((GtkWindow*)mwin, GTK_WIN_POS_CENTER);

	// create a layout box, look this up
	vbox = gtk_vbox_new (FALSE, 2);
	// add it to the main window
	gtk_container_add ((GtkContainer*)mwin, vbox);

	// make some label widgets
	GtkWidget* label[3];
	label[0] = gtk_label_new ("Drag A File To This Window");
	// pack it into the box, look this up too
	gtk_box_pack_start ((GtkBox*)vbox, label[0], FALSE, FALSE, 2);
	label[1] = gtk_label_new (NULL);
	gtk_box_pack_start ((GtkBox*)vbox, label[1], FALSE, FALSE, 2);
	label[2] = gtk_label_new (NULL);
	gtk_box_pack_start ((GtkBox*)vbox, label[2], FALSE, FALSE, 2);
	// make this one fancy
	gtk_label_set_selectable ((GtkLabel*)label[2], TRUE);

	// allow drag-and-drop on the main window
	gtk_drag_dest_set (mwin, GTK_DEST_DEFAULT_ALL,
		 dtype, NDTYPE, GDK_ACTION_COPY);
	// do something with the labels when it happens
	g_signal_connect (mwin, "drag_data_received",
		 G_CALLBACK(DropFiles), label);

	// exit main loop when the window is closed
	g_signal_connect (mwin, "delete-event",
		 G_CALLBACK(gtk_main_quit), NULL);
	// show all the stuff added to the window
	gtk_widget_show_all (mwin);
	gtk_main ();	// run the main loop
	return 0;	// it's all good!
}

void GetInfo(char* sFile, GtkLabel** label)
{
	char *sBase, *sSize, *sDate;	struct stat sb;
	stat(sFile, &sb);	// look up info
	sBase = g_path_get_basename (sFile);
	gtk_label_set_text (label[0], sBase);
	g_free (sBase);
	// this is a useful function from GLib Miscellaneous Utility Functions
	sSize = g_format_size_full (sb.st_size,
		 G_FORMAT_SIZE_LONG_FORMAT | G_FORMAT_SIZE_IEC_UNITS);
	gtk_label_set_text (label[1], sSize);
	g_free (sSize);
	// show the date in a human-readable format
	struct tm* lt = localtime(&sb.st_mtime);
	// add some Pango markup to this one
	sDate = g_strdup_printf ("<i>Modified:</i> <b>%02i/%02i/%i</b>",
		 lt->tm_mon+1, lt->tm_mday, lt->tm_year-100);
	gtk_label_set_text (label[2], sDate);
	gtk_label_set_use_markup ((GtkLabel*)label[2], TRUE);
	g_free (sDate);
}

void DropFiles(GtkWidget* w, GdkDragContext* context,
	 int x, int y, GtkSelectionData* data, int info, int time, GtkLabel** label)
{	// User dropped files, do something!
	char **sDrop, *sFile;
	// get the list of uris dropped on the window
	sDrop = gtk_selection_data_get_uris (data);
	// we need the filename of the first file
	sFile = g_filename_from_uri (sDrop[0], NULL, NULL);
	// we are done with this stuff
	g_strfreev (sDrop);
	gtk_drag_finish (context, TRUE, FALSE, time);
	GetInfo(sFile, label);	g_free (sFile);
}