   <span class="comment">// The cursor entered the client area of the window</span></div>
<div class="line">    }</div>
<div class="line">    <span class="keywordflow">else</span></div>
<div class="line">    {</div>
<div class="line">        <span class="comment">// The cursor left the client area of the window</span></div>
<div class="line">    }</div>
<div class="line">}</div>
</div><!-- fragment --><h2><a class="anchor" id="input_mouse_button"></a>
Mouse button input</h2>
<p>If you wish to be notified wh