Canvas in a scrolled window (pygtk) ?

gtk.ScrolledWindow works with widgets in one of two ways:
1) For widgets with native scrolling support (for example gtk.TreeView,
gtk.TextView, Gtk.Layout) you simply add the widget to the
ScrolledWindow.

2) For widgets without native scrolling support (for example
gtk.DrawingArea, FigureCanvasGTK) you must first add the widget to a
GtkViewport, then add the GtkViewport to the scrolled window.

Attached is an example that shows this.

I already knew that ScrolledWindows worked this way but had never tried
putting a FigureCanvasGTK inside one, and was pleasantly surprised at
how nicely it works.

How is it useful to place the canvas in a scrolled window rather than
just displaying the whole canvas?

Regards
Steve

embedding_in_gtk3.py (1.07 KB)

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On Sat, 2005-07-16 at 20:29 -0700, matplotlib-users-request@lists.sourceforge.net wrote:

Hello everyone,

I have yet another question which I could not solve, even though I read
a lot of the backend specific source code today.

I use the OO interface of matplotlib, specifically the gtk backend, and
I would like to add scrollbars to the canvas widget. Normally I would
pack the widget into a gtk.ScrolledWindow and expect everything to work
fine. But the canvas widget ignores this and still scales with the
window size. Is it possible to specify a fixed size for the canvas?

Best regards,

Niklas Volbers.

Steve Chaplin schrieb:

Is it possible to specify a fixed size for the canvas?
   

gtk.ScrolledWindow works with widgets in one of two ways:
1) For widgets with native scrolling support (for example gtk.TreeView,
gtk.TextView, Gtk.Layout) you simply add the widget to the
ScrolledWindow.

2) For widgets without native scrolling support (for example
gtk.DrawingArea, FigureCanvasGTK) you must first add the widget to a
GtkViewport, then add the GtkViewport to the scrolled window.

Attached is an example that shows this.

Thank you very much for the example. I had actually done _nearly_ the same thing, I even used add_with_viewport. But of course I forget to request a minimum size using canvas.set_size_request ! Thank you very much for your prompt answer.

I already knew that ScrolledWindows worked this way but had never tried
putting a FigureCanvasGTK inside one, and was pleasantly surprised at
how nicely it works.

How is it useful to place the canvas in a scrolled window rather than
just displaying the whole canvas?

Regards
Steve

I considered implementing something like you have in every graphical application or even word processor, where you have a combo-box to specify the visible percentage (25%, 50%, 75%, 100%, .., fit window). This might be useful for larger graphs.

Regards,

Niklas.

···

On Sat, 2005-07-16 at 20:29 -0700, >matplotlib-users-request@lists.sourceforge.net wrote: