Use VIPS to show the metadata of a test image in a non-editable GTK4 4 popover text view.

metadata-popover.c

/*

Use VIPS to show the metadata of a test image in a non-editable GTK4
popover text view.

COMPILE

gcc `pkg-config --cflags gtk4 vips` -o metadata-popover metadata-popover.c `pkg-config --libs gtk4 vips`

RUN

./metadata-popover

NOTE

The "print_field_fn" function was inspired by libvips/vipsheader.c

https://github.com/libvips/libvips/blob/master/tools/vipsheader.c

*/

#include <vips/vips.h>
#include <gtk/gtk.h> 

static void *
print_field_fn( VipsImage *image, const char *field, GValue *value, void *a )
{
	char str[256];
	
	GtkTextBuffer *text_buffer = GTK_TEXT_BUFFER( a );

	VipsBuf buf = VIPS_BUF_STATIC( str );

	gtk_text_buffer_insert_at_cursor( text_buffer,
		field, strlen( field ) );

	gtk_text_buffer_insert_at_cursor( text_buffer, ":", 1 );

	vips_buf_appendgv( &buf, value );

	gtk_text_buffer_insert_at_cursor( text_buffer,
		vips_buf_all( &buf ), vips_buf_len( &buf) );

	gtk_text_buffer_insert_at_cursor( text_buffer, "\n", 1 );

	return( NULL );
}

//static int app_flags = G_APPLICATION_FLAGS_NONE;

static void
activate( GtkApplication *app, gpointer user_data )
{
	GtkWidget *window, *box, *popover, *text_view;
	GtkTextBuffer *text_buffer;
	VipsImage *image;

	image = vips_image_new_temp_file( "a.jpg" );

	window = gtk_application_window_new( app );

	gtk_window_set_title( GTK_WINDOW( window ), "Window" );
	gtk_window_set_default_size( GTK_WINDOW( window ), 500, 500 );

	box = gtk_box_new( GTK_ORIENTATION_VERTICAL, 0 );
	gtk_window_set_child( GTK_WINDOW( window ), box );

	popover = gtk_popover_new();

	gtk_widget_set_parent( popover, box );

	gtk_popover_set_has_arrow( GTK_POPOVER( popover ), FALSE );

	gtk_popover_set_position( GTK_POPOVER( popover ), GTK_POS_RIGHT );

	text_view = gtk_text_view_new();

	gtk_text_view_set_editable( GTK_TEXT_VIEW( text_view ), FALSE );

	gtk_text_view_set_cursor_visible( GTK_TEXT_VIEW( text_view ), FALSE );

	gtk_popover_set_child( GTK_POPOVER( popover ), text_view );
	
	gtk_popover_set_autohide( GTK_POPOVER( popover ), FALSE );

	gtk_widget_set_size_request( popover, 200, 500 );

	text_buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW( text_view ) );

	(void) vips_image_map( image, print_field_fn, text_buffer );

	gtk_widget_show( window );

	gtk_popover_popup( GTK_POPOVER( popover ) );

}

int
main( int argc, char **argv )
{
	GtkApplication *app;
	int status;

	VIPS_INIT( argv[0] );
	
	app = gtk_application_new( "org.gtk.example", G_APPLICATION_FLAGS_NONE );
	g_signal_connect( app, "activate", G_CALLBACK( activate ), NULL );
	status = g_application_run( G_APPLICATION( app ), argc, argv );
	g_object_unref( app );

	return status;
}

The output is as though we typed vipsheader -a at the command line.