LayoutTests/accessibility/mac/undo-redo-text-state.html

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<script src="../../resources/accessibility-helper.js"></script>
<script src="../../resources/js-test.js"></script>
</head>
<body>

<textarea id="target" style="width: 200px; height: 60px">Hello</textarea>

<script>
var output = "This tests that a text control's accessible value, character count, and caret are already correct when the AXValueChanged notification for an undo or a redo is delivered.\n\n";

if (window.accessibilityController) {
    window.jsTestIsAsync = true;

    // Sampled inside the notification handler, so these report what an assistive technology would
    // read on being told the value changed, rather than what settles some time afterwards.
    var valueAtDelivery = null;
    var characterCountAtDelivery = null;
    var caretAtDelivery = null;

    function sampleStateAtDelivery() {
        var element = accessibilityController.accessibleElementById("target");
        valueAtDelivery = element.stringValue;
        characterCountAtDelivery = element.numberOfCharacters;
        caretAtDelivery = element.selectedTextRange;
    }

    function characterCount() {
        return accessibilityController.accessibleElementById("target").numberOfCharacters;
    }

    async function waitForValueChanged(axTarget, command, argument) {
        await waitForNotifications(axTarget, "AXValueChanged", 1,
            () => { document.execCommand(command, false, argument); },
            sampleStateAtDelivery);
    }

    setTimeout(async function() {
        var target = document.getElementById("target");
        target.focus();
        target.setSelectionRange(5, 5);
        var axTarget = accessibilityController.accessibleElementById("target");

        output += "Typing at the end of the value, as one undoable insertion.\n";
        await waitForValueChanged(axTarget, "insertText", " world");
        output += expect("characterCountAtDelivery", "11");
        output += expect("valueAtDelivery", "'AXValue: Hello world'");
        output += expect("caretAtDelivery", "'{11, 0}'");

        // Undo restores the selection the insertion started from, so the caret returns to where the
        // typing began rather than staying at the end of the shortened value.
        output += "\nUndoing the insertion.\n";
        await waitForValueChanged(axTarget, "undo");
        output += expect("characterCountAtDelivery", "5");
        output += expect("valueAtDelivery", "'AXValue: Hello'");
        output += expect("caretAtDelivery", "'{5, 0}'");

        output += "\nRedoing the insertion.\n";
        await waitForValueChanged(axTarget, "redo");
        output += expect("characterCountAtDelivery", "11");
        output += expect("valueAtDelivery", "'AXValue: Hello world'");
        output += expect("caretAtDelivery", "'{11, 0}'");

        output += "\nThe value the notification advertised is the one that persists.\n";
        output += expect("characterCount()", "11");

        document.getElementById("target").style.visibility = "hidden";
        debug(output);
        finishJSTest();
    }, 0);
}
</script>
</body>
</html>