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Added an example of how to use GDK_MODIFIER_MASK to test for modifier keys

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2004-02-16  Federico Mena Quintero  <federico@ximian.com>

	* gdk/tmpl/windows.sgml: Added an example of how to use
	GDK_MODIFIER_MASK to test for modifier keys correctly.

	* gtk/migrating-checklist.sgml: Likewise.
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Federico Mena Quintero 2004-02-16 19:00:16 +00:00 committed by Federico Mena Quintero
parent 7385f595e8
commit b3115437dd
2 changed files with 50 additions and 0 deletions
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2
docs/reference/ChangeLog
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@ -3,6 +3,8 @@
* gdk/tmpl/windows.sgml: Added an example of how to use
GDK_MODIFIER_MASK to test for modifier keys correctly.
* gtk/migrating-checklist.sgml: Likewise.
Sun Feb 15 23:51:08 2004 Matthias Clasen <maclas@gmx.de>
* gtk/tmpl/gtkcomboboxentry.sgml:

48
docs/reference/gtk/migrating-checklist.sgml
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@ -210,6 +210,54 @@ my_widget_expose_event_handler (GtkWidget *widget, GdkEventExpose *event)
}
</programlisting>
</section>
<section id="checklist-modifiers">
<title>Test for modifier keys correctly</title>
<formalpara>
<title>Why</title>
<para>
With <constant>GDK_MODIFIER_MASK</constant> you can test for
modifier keys reliably; this way your key event handlers will
work correctly even if <keycap>NumLock</keycap> or
<keycap>CapsLock</keycap> are activated.
</para>
</formalpara>
<para>
In a <structname>GdkEventKey</structname>, the
<structfield>state</structfield> field is a bit mask which
indicates the modifier state at the time the key was pressed.
Modifiers are keys like <keycap>Control</keycap>, and
<keycap>NumLock</keycap>. When implementing a <link
linkend="GtkWidget-key-press-event">GtkWidget::key_press_event</link>
handler, you should use the
<constant>GDK_MODIFIER_MASK</constant> constant to test against
modifier keys. This value encompasses all the modifiers which
the user may be actively pressing, such as
<keycap>Control</keycap> and <keycap>Shift</keycap>, but ignores
"inocuous" modifiers such as <keycap>NumLock</keycap> and
<keycap>CapsLock</keycap>. The following example tests for
<keycombo>
<keycap>Control</keycap><keycap>F10</keycap></keycombo> being
pressed.
</para>
<programlisting id="GDK_MODIFIER_MASK">
static gboolean
my_widget_key_press_handler (GtkWidget *widget, GdkEventKey *event)
{
if (event-&gt;keysym == GDK_F10
&amp;&amp; (event-&gt;state &amp; GDK_MODIFIER_MASK) == GDK_CONTROL_MASK)
{
g_print ("Control-F10 was pressed\n");
return TRUE;
}
return FALSE;
}
</programlisting>
</section>
</chapter>
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