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26 December 2018, 22:31:15 UTC
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Tip revision: 74c1042fbe21a44ab287c67134afb76012587f2f authored by Anne van Kesteren on 11 April 2018, 13:03:14 UTC
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Tip revision: 74c1042
canvas_focus_drawFocusIfNeeded_AAPI_001-manual.html 
<html>
  <head>
    <meta charset="UTF-8">
    <title>drawFocusIfNeeded() - AAPI test</title>
    <link rel="author" title="Mark Sadecki" href="mark@w3.org">
    <link rel="help" href="http://www.w3.org/TR/2dcontext/#dom-context-2d-drawFocusIfNeeded">

  </head>
  <body>
    <h1>Description</h1>
    <p>This manual test can be used to verify that drawFocusIfNeeded actually updates the accessible location information (i.e. UIAutomation's CurrentBoundingRectangle) in the Accessibility API.  To perform this test, you will need an <a href="http://www.w3.org/WAI/PF/wiki/ARIA_Test_Plan#Test_tools">accessibility API inspector</a>.  To perform this test, use the <code>tab</code> key to move from the first focusable element to through to the fourth.  This test passes if the first parameter of the bounding rectangle increases by 100 when focus is moved from the gray square to the orange square.</p>
    <p><a href="http://www.w3.org">First focusable element</a></p>
    <canvas height=100 width=200 id=canvas>
      <a href='http://www.w3.org' id='button1'>Second focusable element</a>
      <a href='http://www.w3.org' id='button2'>Third focusable element</a>
    </canvas>
    <p><a href="http://www.w3.org">Fourth focusable element</a></p>

    <script>
        var button1 = document.getElementById('button1');
        var button2 = document.getElementById('button2');
        var canvas = document.getElementById('canvas');
        var buttons = canvas.getElementsByTagName('a');

        for (var i = 0; i < buttons.length; i++) {
          buttons[i].addEventListener('focus', drawCanvas, false);
          buttons[i].addEventListener('blur', drawCanvas, false);
        }

        function drawRect(context, color, element) {
          context.beginPath();
          context.rect(10, 10, 80, 80);
          context.fillStyle = color;
          context.fill();
          context.drawFocusIfNeeded(element);
        }

        function drawCanvas() {
          var canvas = document.getElementById('canvas');
          var context = canvas.getContext('2d');
          context.clearRect (0, 0, 200, 100);

          drawRect(context, "gray", button1);
          context.translate(100,0);
          drawRect(context, "orange", button2);
        }
        drawCanvas();
    </script>
  </body>
</html>
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