Re: GtkTextView - when the buffer rendering is finished?

["Lukasz Gromotowicz" <gromot gmail com>]

Thanks a lot!!!!
 

> A while back I recall Owen saying that GtkWidget's 'expose-event' signal
>
> could be relied on as an indication that the idle thread that does the
> rendering has completed updating.
> http://library.gnome.org/devel/gtk/stable/GtkWidget.html#GtkWidget-expose-event


This works perfectly for me.

Regards,
LUK

2008/11/13 Andrew Cowie <andrew operationaldynamics com>

On Thu, 2008-11-13 at 09:23 +0000, Lukasz Gromotowicz wrote:
> is there any way to check if the whole GtkTextBuffer had been rendered
> to the GtkTextView?

A while back I recall Owen saying that GtkWidget's 'expose-event' signal
could be relied on as an indication that the idle thread that does the
rendering has completed updating.
http://library.gnome.org/devel/gtk/stable/GtkWidget.html#GtkWidget-expose-event

Which certainly makes sense, seeing as how the result of doing all the
line height calculations is to _draw_ the resultant lines, and thence
expose. So that might work for you.

> I want to display the procentage of the data displayed on the screen
> (and update it during scrolling)

I ran into something similar; in my case the problem was the fact that
all the line height calculations and conversions are *wrong* before
[re]validation of the line heights has occurred.

Reading the GtkTextView source code I discovered that the emission of
the 'value-changed' signal on the GtkAdjustment (controlling the
position of the GtkScrollbar) is the internal trigger for the
revalidation to occur.
http://library.gnome.org/devel/gtk/stable/GtkAdjustment.html#GtkAdjustment-value-changed

So, manually emitting that signal can be a mechanism to initiate the
redrawing process. This isn't public API, but it does seem to work.  See
line 53 of
http://svn.gnome.org/viewvc/gtk%2B/trunk/gtk/gtktextview.c?view=markup

I wrote about our experience of using it here:
http://java-gnome.sourceforge.net/4.0/doc/api/org/gnome/gtk/TextView.html#height

The issue of validation seems to come up a lot. It's a shame that there
isn't a "force redraw" or "force validate" method on GtkTreeView.

AfC
Sydney

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Andrew Frederick Cowie

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