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Re: Clarification needed


16.05.2016 00:26 Igor Korot <ikorot01@xxxxxxxxx> wrote:
> Hi, ALL,
> In the
> https://developer.gnome.org/gtk3/stable/GtkTextView.html#GtkTextView-move-cursor
> it said:
> [quote]
> Applications should not connect to it, but may emit it with
> g_signal_emit_by_name() if they need to control the cursor
> programmatically.
> [/quote]
> If this signal is not meant to be connected, how come it is documented?
> And if it is documented, does this mean I can connect to it and it will work?

First of all, GtkTextView framework is pretty complex and I am by no means
an expert so I may be wrong about what I write here. "move-cursor" signal
is meant for keybinding, it is emitted when a user presses arrow keys,
PgUp, PgDn, Home, End, etc. The default implementation moves a cursor
by one character left when the user presses an arrow left key etc.
Of course you can connect if you want a custom behavior, different by
the default. But this is probably not what you want because it handles
only keyboard action, does not handle mouse, touchscreen, etc.

> Or there is another signal I can connect to to catch the cursor movements?

Probably you should retrieve the GtkTextBuffer object:
and then watch its "cursor-position" property:
connecting to the "notify::cursor-position" signal.

> Also, what is the difference between this one and "extend-selection"?

"extend-selection" is emitted when the user makes an action which by
default extends the selection, for example presses Shift + arrow keys,
drags the mouse, double clicks, etc. Again, it is not prohibited to
connect to this signal if you don't like the default behavior and
want to change it.


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