CODEWITHSUNDEEP
pythongtktooltippygtk
Matthew Jacobs
Matthew Jacobs

Reputation: 4424

Adding a tooltip to an image

I'm trying to add a tooltip to an image. Following a PyGTK tutorial it seems that this should work:

image = gtk.Image()
image.set_from_file(image_path)
box.pack_start(image, expand=False)

tooltip = gtk.Tooltips()
tooltip.set_tip(image, "Hello!")

Except it doesn't. Nothing happens when I mouse over the image. However, I know that works with buttons (I ran the sample code from the tutorial).

With GTK 2.12 and above, I could probably just use image.set_tooltip_text("Hello!") but I'm stuck at 2.10.4 and have to use gtk.Tooltips.

Edit

According to the documentation for gtk.Tooltips:

Tooltips can only be set on widgets which have their own X window. To check if a widget has its own window use widget.flags()&gtk.NO_WINDOW. To add a tooltip to a widget that doesn't have its own window, place the widget inside a gtk.EventBox and add a tooltip to the eventbox instead.

So that solves my problem but leaves me a bit confused. I checked the flags for a button and it has the same gtk.NO_WINDOW flag that images have. So why don't buttons need an EventBox but images do?

Upvotes: 0

Views: 1244

Answers (1)

jeffmagill
jeffmagill

Reputation: 301

To satisfy its interface, GktButton creates an event box (well, something like an event box) for itself, internally. I.e. it captures events in a non-visible gdk window. GtkImage doesn't have a similar interface to satisfy so it doesn't need to capture events.

Perhaps it's an accident of the button's internal implementation that using the tooltip interface works without embedding a button in an EventBox or perhaps the tooltip interface actually depends upon a gdk window whether it's visible or not and the Widget interface lacks that sort of flag.

Upvotes: 0

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