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	<title>Big C++: Chptr. 27 -- Graphical User Interfaces</title>
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  <meta name="Copyright" content="2005 John Wiley & Sons">
  <meta name="Author" content="Kurt Schmidt">
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<h2><font color='#009999'>27.8 Mouse Events (cont.)</font></h2>
<ul>
  <li><font size="+1">In the notification functions, you can query the <tt>wxMouseEvent</tt> 
    about the event type (e.g. <tt>ButtonDown()</tt> returns <tt>true</tt> or 
    <tt>false</tt>, <tt>GetX()</tt> returns the <i>x</i>-position of the mouse, 
    etc.). 
    <blockquote> 
      <pre>void TriangleWindow::OnMouseEvent(wxMouseEvent& event)
{
   if (event.ButtonDown() &amp;&amp; corners &lt; 3)
   {
      x[corners] = event.GetX();
      y[corners] = event.GetY();
      corners++;
      Refresh();
   }   
}</pre>
    </blockquote>
    </font></li>
  <li><font size="+1">In our program, we allow the user to specify a triangle 
    by clicking on the three corners.</font></li>
  <li><font size="+1">With each press, we record the mouse position.</font></li>
  <li><font size="+1">All drawing should happen in the paint handler.</font></li>
  <li><font size="+1">The <tt>Refresh</tt> function generates a paint event, which 
    eventually causes the paint function to be called.</font></li>
  <li><font size="+1">Calling the paint function directly should never be done 
    - always refresh instead.</font></li>
</ul>
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