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[docs] Note that grabs are evil

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Grabs are an entirely evil way to override the whole event delivery
machinery that Clutter has in place.

A pointer grab can be effectively replaced by a much more reliable
::captured-event signal handler, for instance.

Sometimes, grabs are a necessary evil -- and that is why Clutter
exposes them in the API; that should not fool anyone into thinking
that they should be used unless strictly necessary.
This commit is contained in:
Emmanuele Bassi 2009-03-03 22:51:17 +00:00
parent c0adf4582c
commit 4e98fc5e79
1 changed files with 19 additions and 6 deletions
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25
clutter/clutter-main.c
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@ -2361,8 +2361,14 @@ on_pointer_grab_weak_notify (gpointer data,
*
* Grabs pointer events, after the grab is done all pointer related events
* (press, motion, release, enter, leave and scroll) are delivered to this
* actor directly. The source set in the event will be the actor that would
* have received the event if the pointer grab was not in effect.
* actor directly without passing through both capture and bubble phases of
* the event delivery chain. The source set in the event will be the actor
* that would have received the event if the pointer grab was not in effect.
*
* <note><para>Grabs completely override the entire event delivery chain
* done by Clutter. Pointer grabs should only be used as a last resource;
* using the #ClutterActor::captured-event signal should always be the
* preferred way to intercept event delivery to reactive actors.</para></note>
*
* If you wish to grab all the pointer events for a specific input device,
* you should use clutter_grab_pointer_for_device().
@ -2515,10 +2521,17 @@ on_keyboard_grab_weak_notify (gpointer data,
* clutter_grab_keyboard:
* @actor: a #ClutterActor
*
* Grabs keyboard events, after the grab is done keyboard events ("key-press-event"
* and "key-release-event") are delivered to this actor directly. The source
* set in the event will be the actor that would have received the event if the
* keyboard grab was not in effect.
* Grabs keyboard events, after the grab is done keyboard
* events (#ClutterActor::key-press-event and #ClutterActor::key-release-event)
* are delivered to this actor directly. The source set in the event will be
* the actor that would have received the event if the keyboard grab was not
* in effect.
*
* Like pointer grabs, keyboard grabs should only be used as a last
* resource.
*
* See also clutter_stage_set_key_focus() and clutter_actor_grab_key_focus()
* to perform a "soft" key grab and assign key focus to a specific actor.
*
* Since: 0.6
*/