Re: PDF page not rendering properly if the page is changed

[Germán Poo-Caamaño <gpoo gnome org>]

On Wed, 2018-11-28 at 17:17 +0100, Радомир Хаџић via gtk-app-devel-list 
wrote:
> Hello.
>
> I've sent as an attachment a code for a very simple PDF viewer. It is
> not that well written but that's because I wanted it to be simple and
> easy to understand. The purpose of the program is to illustrate a
> problem that I'm having with my larger project.
>
> The problem is that if a user changes page (by clicking "Previous
> Page" or "Next Page") and the page when scaled accordingly is bigger
> than the visible portion of the page rendering area (GtkDrawingArea),
> then only the part of the page will render. You can try this
> yourself:
> 1. Open a document 2. Make sure that the next page is not completely
> visible on the screen (so the scrollbars appear, this can be usually
> achieved by clicking "Fit Width") 3. Click "Next page" and try
> scrolling. You'll notice that one part of the page is not rendered.
>
> So, why is this happening and how can I solve it? What also confuses
> me is that rendering() function is definitely called when I scroll
> but
> the page does not render (though it does render as it should when I
> scroll the first page of a just opened document) properly, but if I
> then resize the window the page renders properly.

I do not see any attachment.

My guess is: the page maybe cached somewhere, and it is reloaded (re-
rendered) when the view size changes.

-- 
Germán Poo-Caamaño
http://calcifer.org/