openseadragon/test/modules/drawer.js

/* global QUnit, $, Util, testLog */

(function() {
    var viewer;

    QUnit.module('Drawer', {
        beforeEach: function () {
            $('<div id="example"></div>').appendTo("#qunit-fixture");

            testLog.reset();
        },
        afterEach: function () {
            if (viewer && viewer.close) {
                viewer.close();
            }
            if (viewer && viewer.destroy){
                viewer.destroy();
            }
            viewer = null;
        }
    });

    // ----------
    var createViewer = function(options) {
        options = options || {};
        // eslint-disable-next-line new-cap
        viewer = OpenSeadragon(OpenSeadragon.extend({
            id:            'example',
            prefixUrl:     '/build/openseadragon/images/',
            springStiffness: 100 // Faster animation = faster tests
        }, options));
    };

    // ----------
    QUnit.test('basics', function(assert) {
        var done = assert.async();
        createViewer();
        assert.ok(viewer.drawer, 'Drawer exists');
        assert.equal(viewer.drawer.canRotate(), OpenSeadragon.supportsCanvas, 'we can rotate if we have canvas');
        done();
    });

    // ----------
    QUnit.test('rotation', function(assert) {
        var done = assert.async();
        createViewer({
            tileSources: '/test/data/testpattern.dzi',
            drawer: 'context2d', // this test only makes sense for certain drawers
        });

        viewer.addHandler('open', function handler(event) {
            viewer.viewport.setRotation(30, true);
            Util.spyOnce(viewer.drawer.context, 'rotate', function() {
                assert.ok(true, 'drawing with new rotation');
                done();
            });
        });
    });

    // ----------
    QUnit.test('debug', function(assert) {
        var done = assert.async();
        createViewer({
            tileSources: '/test/data/testpattern.dzi',
            debugMode: true
        });

        Util.spyOnce(viewer.drawer, '_drawDebugInfo', function() {
            assert.ok(true, '_drawDebugInfo is called');
            done();
        });
    });

    // ----------
    QUnit.test('sketchCanvas', function(assert) {
        var done = assert.async();
        createViewer({
            tileSources: '/test/data/testpattern.dzi',
            drawer: 'context2d' // test only makes sense for this drawer
        });
        var drawer = viewer.drawer;

        viewer.addHandler('tile-drawn', function noOpacityHandler() {
            viewer.removeHandler('tile-drawn', noOpacityHandler);
            assert.equal(drawer.sketchCanvas, null,
                'The sketch canvas should be null if no decimal opacity is used.');
            assert.equal(drawer.sketchContext, null,
                'The sketch context should be null if no decimal opacity is used.');
            testOpacityDecimal();
        });

        function testOpacityDecimal() {
            var tiledImage;
            viewer.addTiledImage({
                tileSource: '/test/data/testpattern.dzi',
                opacity: 0.5,
                success: function(event) {
                    tiledImage = event.item;
                }
            });

            viewer.addHandler('tile-drawn', function opacityDecimalHandler(event) {
                if (tiledImage !== event.tiledImage) {
                    return;
                }
                viewer.removeHandler('tile-drawn', opacityDecimalHandler);
                assert.notEqual(drawer.sketchCanvas, null,
                    'The sketch canvas should not be null once a decimal opacity has been used.');
                assert.notEqual(drawer.sketchContext, null,
                    'The sketch context should not be null once a decimal opacity has been used.');
                done();
            });
        }
    });

    // ----------
    QUnit.test('deprecations', function(assert) {
        var done = assert.async();

        createViewer({
            tileSources: '/test/data/testpattern.dzi'
        });
        viewer.world.addHandler('add-item', function() {
            // no current deprecated methods
            assert.expect(0);
            done();
        });
    });

})();