On Tue, 2007-07-17 at 13:53 +0200, Cédric Lucantis wrote: > Le lundi 16 juillet 2007 12:50, charlesvpacker a écrit : > > I'm a GTK newbie who has successfully taken the very first > > steps toward building a custom image processing application. > > I've figured out how to read and display an image using > > a GtkImage and GtkPixbuf. I've also modified a block of pixels > > in the existing pixbuf and updated the displayed image > > via gtk_image_set_from_pixbuf. Now I want to get the pixel > > position of the mouse cursor resting on the image. I don't recall > > seeing a GTK tutorial on capturing pointer position or motion. > > Could somebody, um, point me to one? > > > > If you want this from within a mouse event handler, you can use the > (x,y) and (x_root,y_root) members provided by all the mouse event > types. The first pair gives the position of the mouse relative to the > event window and the second the position relative to the screen origin. > > If you're not in a handler, you still have gdk_window_get_pointer() and > gdk_display_get_pointer(). See the Gdk reference manual for more infos > (sections 'Event structures', 'Windows' and 'Display').
You can also use gtk_widget_get_pointer(), which has the advantage of providing the position in widget co-ordinates. The gdk functions, including the gdk event callbacks, provide it in (Gdk/X) window co-ordinates. The two can be different in, for example, TreeView columns with headers, and some Gtk functions (such as for example gtk_tree_view_get_dest_row_at_pos()) expect widget co-ordinates. Chris _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
