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microsoft
GitHub Repository: microsoft/vscode
 Path: blob/main/src/vs/base/test/browser/ui/scrollbar/scrollbarState.test.ts
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/*---------------------------------------------------------------------------------------------

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 *  Copyright (c) Microsoft Corporation. All rights reserved.

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 *  Licensed under the MIT License. See License.txt in the project root for license information.

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 *--------------------------------------------------------------------------------------------*/

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import assert from 'assert';

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import { ScrollbarState } from '../../../../browser/ui/scrollbar/scrollbarState.js';

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import { ensureNoDisposablesAreLeakedInTestSuite } from '../../../common/utils.js';

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suite('ScrollbarState', () => {

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	ensureNoDisposablesAreLeakedInTestSuite();

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	test('inflates slider size', () => {

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		const actual = new ScrollbarState(0, 14, 0, 339, 42423, 32787);

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		assert.strictEqual(actual.getArrowSize(), 0);

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		assert.strictEqual(actual.getScrollPosition(), 32787);

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		assert.strictEqual(actual.getRectangleLargeSize(), 339);

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		assert.strictEqual(actual.getRectangleSmallSize(), 14);

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		assert.strictEqual(actual.isNeeded(), true);

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		assert.strictEqual(actual.getSliderSize(), 20);

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		assert.strictEqual(actual.getSliderPosition(), 249);

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		assert.strictEqual(actual.getDesiredScrollPositionFromOffset(259), 32849);

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		// 259 is greater than 230 so page down, 32787 + 339 =  33126

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		assert.strictEqual(actual.getDesiredScrollPositionFromOffsetPaged(259), 33126);

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		actual.setScrollPosition(32849);

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		assert.strictEqual(actual.getArrowSize(), 0);

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		assert.strictEqual(actual.getScrollPosition(), 32849);

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		assert.strictEqual(actual.getRectangleLargeSize(), 339);

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		assert.strictEqual(actual.getRectangleSmallSize(), 14);

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		assert.strictEqual(actual.isNeeded(), true);

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		assert.strictEqual(actual.getSliderSize(), 20);

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		assert.strictEqual(actual.getSliderPosition(), 249);

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	});

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	test('inflates slider size with arrows', () => {

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		const actual = new ScrollbarState(12, 14, 0, 339, 42423, 32787);

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		assert.strictEqual(actual.getArrowSize(), 12);

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		assert.strictEqual(actual.getScrollPosition(), 32787);

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		assert.strictEqual(actual.getRectangleLargeSize(), 339);

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		assert.strictEqual(actual.getRectangleSmallSize(), 14);

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		assert.strictEqual(actual.isNeeded(), true);

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		assert.strictEqual(actual.getSliderSize(), 20);

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		assert.strictEqual(actual.getSliderPosition(), 230);

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		assert.strictEqual(actual.getDesiredScrollPositionFromOffset(240 + 12), 32811);

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		// 240 + 12 = 252; greater than 230 so page down, 32787 + 339 =  33126

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		assert.strictEqual(actual.getDesiredScrollPositionFromOffsetPaged(240 + 12), 33126);

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		actual.setScrollPosition(32811);

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		assert.strictEqual(actual.getArrowSize(), 12);

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		assert.strictEqual(actual.getScrollPosition(), 32811);

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		assert.strictEqual(actual.getRectangleLargeSize(), 339);

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		assert.strictEqual(actual.getRectangleSmallSize(), 14);

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		assert.strictEqual(actual.isNeeded(), true);

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		assert.strictEqual(actual.getSliderSize(), 20);

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		assert.strictEqual(actual.getSliderPosition(), 230);

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	});

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});

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