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cookbook: Fix key press to examine modifers correctly

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The simple key press example in the cookbook used a brittle
and incorrect switch statement to test modifier values. Instead,
use logical "&" of the state with the modifiers we're interested
in to check which keys were pressed.

http://bugzilla.clutter-project.org/show_bug.cgi?id=2223
This commit is contained in:
Elliot Smith 2010-07-19 12:52:00 +01:00 committed by Emmanuele Bassi
parent 5865d2a4b3
commit e45b8be71b
1 changed files with 14 additions and 18 deletions
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32
doc/cookbook/events.xml
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@ -102,31 +102,26 @@ g_signal_connect (actor, "key-press-event", G_CALLBACK (_key_press_cb), NULL);
<informalexample>
<programlisting>
<![CDATA[
static gboolean
_key_press_cb (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
ClutterEvent *event,
gpointer user_data)
{
guint keyval = clutter_event_get_key_symbol (event);
ClutterModifierType state = clutter_event_get_state (event);
gboolean shift_pressed = (state & CLUTTER_SHIFT_MASK ? TRUE : FALSE);
gboolean ctrl_pressed = (state & CLUTTER_CONTROL_MASK ? TRUE : FALSE);
if (CLUTTER_Up == keyval)
{
ClutterModifierType modifiers = clutter_event_get_state (event);
switch (modifiers)
{
case CLUTTER_SHIFT_MASK:
g_debug ("Up and shift pressed");
break;
case CLUTTER_SHIFT_MASK + CLUTTER_CONTROL_MASK:
g_debug ("Up and shift and control pressed");
break;
default:
g_debug ("Up pressed");
break;
}
if (shift_pressed & ctrl_pressed)
g_debug ("Up and shift and control pressed");
else if (shift_pressed)
g_debug ("Up and shift pressed");
else
g_debug ("Up pressed");
/* The event was handled, and the emission should stop */
return TRUE;
@ -135,6 +130,7 @@ _key_press_cb (ClutterActor *actor,
/* The event was not handled, and the emission should continue */
return FALSE;
}
]]>
</programlisting>
</informalexample>