mirror of https://github.com/zulip/zulip.git
96 lines
2.2 KiB
JavaScript
96 lines
2.2 KiB
JavaScript
zrequire('scroll_util');
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set_global('ui', {
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get_scroll_element: element => element,
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});
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run_test('scroll_delta', () => {
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// If we are entirely on-screen, don't scroll
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assert.equal(0, scroll_util.scroll_delta({
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elem_top: 1,
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elem_bottom: 9,
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container_height: 10,
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}));
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assert.equal(0, scroll_util.scroll_delta({
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elem_top: -5,
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elem_bottom: 15,
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container_height: 10,
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}));
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// The top is offscreen.
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assert.equal(-3, scroll_util.scroll_delta({
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elem_top: -3,
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elem_bottom: 5,
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container_height: 10,
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}));
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assert.equal(-3, scroll_util.scroll_delta({
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elem_top: -3,
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elem_bottom: -1,
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container_height: 10,
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}));
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assert.equal(-11, scroll_util.scroll_delta({
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elem_top: -150,
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elem_bottom: -1,
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container_height: 10,
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}));
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// The bottom is offscreen.
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assert.equal(3, scroll_util.scroll_delta({
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elem_top: 7,
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elem_bottom: 13,
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container_height: 10,
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}));
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assert.equal(3, scroll_util.scroll_delta({
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elem_top: 11,
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elem_bottom: 13,
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container_height: 10,
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}));
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assert.equal(11, scroll_util.scroll_delta({
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elem_top: 11,
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elem_bottom: 99,
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container_height: 10,
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}));
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});
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run_test('scroll_element_into_container', () => {
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const container = (function () {
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var top = 3;
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return {
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height: () => 100,
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scrollTop: (arg) => {
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if (arg === undefined) {
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return top;
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}
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top = arg;
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},
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};
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}());
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const elem1 = {
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innerHeight: () => 25,
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position: () => {
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return {
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top: 0,
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};
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},
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};
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scroll_util.scroll_element_into_container(elem1, container);
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assert.equal(container.scrollTop(), 3);
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const elem2 = {
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innerHeight: () => 15,
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position: () => {
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return {
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top: 250,
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};
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},
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};
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scroll_util.scroll_element_into_container(elem2, container);
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assert.equal(container.scrollTop(), 250 - 100 + 3 + 15);
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});
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