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cookbook: Added more explanation about setting y coord on scrollable

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Added some extra explanation, referencing the sample code, to
try to make the scrollable actor example easier to follow. Basically
demonstrates the principles described in the paragraph about
setting the y coordinate for the scrollable actor, but using actual
numbers.
This commit is contained in:
Elliot Smith 2010-08-12 10:05:27 +01:00
parent a74d585fc5
commit 8db96675d4
1 changed files with 11 additions and 0 deletions
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11
doc/cookbook/events.xml
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@ -635,6 +635,17 @@ _scroll_event_cb (ClutterActor *viewport,
<para>Scrolling down adds to the <code>y</code> coordinate
(but only up to a maximum value of <code>0.0</code>).</para>
<para>To see how this works in practice, look at
<link linkend="events-mouse-scroll-example">the code
sample</link>. There, the height of the scrollable actor is
set to <code>300</code> and the height of the viewport to
<code>150</code>. This means that the <code>y</code>
coordinate value for the scrollable actor will vary between
<code>-150.0</code> (<code>150 - 300</code>), making
its base visible and clipping the top; and
<code>0.0</code>, where its top is visible and its base
clipped.</para>
</listitem>
<listitem>