gecko-dev/testing/web-platform/tests/pointerevents/pointerevent_support.js

var All_Pointer_Events = [
        "pointerdown",
        "pointerup",
        "pointercancel",
        "pointermove",
        "pointerover",
        "pointerout",
        "pointerenter",
        "pointerleave",
        "gotpointercapture",
        "lostpointercapture"];

// Check for conformance to PointerEvent interface
// TA: 1.1, 1.2, 1.6, 1.7, 1.8, 1.9, 1.10, 1.11, 1.12, 1.13
function check_PointerEvent(event) {
    test(function () {
        assert_true(event instanceof PointerEvent, "event is a PointerEvent event");
    }, event.type + " event is a PointerEvent event");


    // Check attributes for conformance to WebIDL:
    // * attribute exists
    // * has proper type
    // * if the attribute is "readonly", it cannot be changed
    // TA: 1.1, 1.2
    var idl_type_check = {
        "long": function (v) { return typeof v === "number" && Math.round(v) === v; },
        "float": function (v) { return typeof v === "number"; },
        "string": function (v) { return typeof v === "string"; },
        "boolean": function (v) { return typeof v === "boolean" }
    };
    [
        ["readonly", "long", "pointerId"],
        ["readonly", "float", "width"],
        ["readonly", "float", "height"],
        ["readonly", "float", "pressure"],
        ["readonly", "long", "tiltX"],
        ["readonly", "long", "tiltY"],
        ["readonly", "string", "pointerType"],
        ["readonly", "boolean", "isPrimary"]
    ].forEach(function (attr) {
        var readonly = attr[0];
        var type = attr[1];
        var name = attr[2];


        // existence check
        test(function () {
            assert_true(name in event, name + " attribute in " + event.type + " event");
        }, event.type + "." + name + " attribute exists");


        // readonly check
        if (readonly === "readonly") {
            test(function () {
                assert_readonly(event.type, name, event.type + "." + name + " cannot be changed");
            }, event.type + "." + name + " is readonly");
        }


        // type check
        test(function () {
            assert_true(idl_type_check[type](event[name]), name + " attribute of type " + type);
        }, event.type + "." + name + " IDL type " + type + " (JS type was " + typeof event[name] + ")");
    });


    // Check the pressure value
    // TA: 1.6, 1.7, 1.8
    test(function () {
        // TA: 1.6
        assert_greater_than_equal(event.pressure, 0, "pressure is greater than or equal to 0");
        assert_less_than_equal(event.pressure, 1, "pressure is less than or equal to 1");


        // TA: 1.7, 1.8
        if (event.pointerType === "mouse") {
            if (event.buttons === 0) {
                assert_equals(event.pressure, 0, "pressure is 0 for mouse with no buttons pressed");
            } else {
                assert_equals(event.pressure, 0.5, "pressure is 0.5 for mouse with a button pressed");
            }
        }
    }, event.type + ".pressure value is valid");


    // Check mouse-specific properties
    if (event.pointerType === "mouse") {
        // TA: 1.9, 1.10, 1.13
        test(function () {
            assert_equals(event.tiltX, 0, event.type + ".tiltX is 0 for mouse");
            assert_equals(event.tiltY, 0, event.type + ".tiltY is 0 for mouse");
            assert_true(event.isPrimary, event.type + ".isPrimary is true for mouse");
        }, event.type + " properties for pointerType = mouse");
        // Check properties for pointers other than mouse
    }
}

function showPointerTypes() {
    var complete_notice = document.getElementById("complete-notice");
    var pointertype_log = document.getElementById("pointertype-log");
    var pointertypes = Object.keys(detected_pointertypes);
    pointertype_log.innerHTML = pointertypes.length ?
    pointertypes.join(",") : "(none)";
    complete_notice.style.display = "block";
}

function log(msg, el) {
    if (++count > 16){
      count = 0;
      el.innerHTML = ' ';
    }
    el.innerHTML = msg + '; ' + el.innerHTML;
}

 function failOnScroll() {
    assert_true(false,
    "scroll received while shouldn't");
}

function updateDescriptionNextStep() {
    document.getElementById('desc').innerHTML = "Test Description: Try to scroll text RIGHT.";
}

function updateDescriptionComplete() {
    document.getElementById('desc').innerHTML = "Test Description: Test complete";
}

function sPointerCapture(e) {
    try {
        isPointerCapture = true;
        target0.setPointerCapture(e.pointerId);
    }
    catch(e) {
    }
}

function rPointerCapture(e) {
    try {
        isPointerCapture = false;
        target0.releasePointerCapture(e.pointerId);
    }
    catch(e) {
    }
}

// declare the follwoing variables to use this function: previousPointerX, previousPointerY, currentPointerX, currentPointerY;
// init previousPointerX, previousPointerY before calling of the function; in "pointerdown" event handler for example
function checkDirection(testToStep, isVertical, currentMoveCount, moveCountToPass, delta, event) {
    if(!isVertical) {
        if(currentMoveCount > moveCountToPass / 2) { // avoid immediate triggering while vertical scroll is still performed
                testToStep.step( function() {
                currentPointerY = event.clientY;
                assert_approx_equals(previousPointerY, currentPointerY, delta, "scroll move was along horisontal line: ");
                previousPointerY = currentPointerY;
            });
        }
    }
    else {
        testToStep.step( function() {
            currentPointerX = event.clientX;
            assert_approx_equals(previousPointerX, currentPointerX, delta, "scroll move was along vertical line: ");
            previousPointerX = currentPointerX;
        });
    }
}