| 1 | /**
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| 2 | * @license
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| 3 | * Copyright Google LLC All Rights Reserved.
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| 4 | *
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| 5 | * Use of this source code is governed by an MIT-style license that can be
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| 6 | * found in the LICENSE file at https://angular.io/license
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| 7 | */
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| 8 | /**
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| 9 | * Shallow-extends a stylesheet object with another stylesheet-like object.
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| 10 | * Note that the keys in `source` have to be dash-cased.
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| 11 | * @docs-private
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| 12 | */
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| 13 | export function extendStyles(dest, source, importantProperties) {
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| 14 | for (let key in source) {
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| 15 | if (source.hasOwnProperty(key)) {
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| 16 | const value = source[key];
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| 17 | if (value) {
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| 18 | dest.setProperty(key, value, (importantProperties === null || importantProperties === void 0 ? void 0 : importantProperties.has(key)) ? 'important' : '');
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| 19 | }
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| 20 | else {
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| 21 | dest.removeProperty(key);
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| 22 | }
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| 23 | }
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| 24 | }
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| 25 | return dest;
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| 26 | }
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| 27 | /**
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| 28 | * Toggles whether the native drag interactions should be enabled for an element.
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| 29 | * @param element Element on which to toggle the drag interactions.
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| 30 | * @param enable Whether the drag interactions should be enabled.
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| 31 | * @docs-private
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| 32 | */
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| 33 | export function toggleNativeDragInteractions(element, enable) {
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| 34 | const userSelect = enable ? '' : 'none';
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| 35 | extendStyles(element.style, {
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| 36 | 'touch-action': enable ? '' : 'none',
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| 37 | '-webkit-user-drag': enable ? '' : 'none',
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| 38 | '-webkit-tap-highlight-color': enable ? '' : 'transparent',
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| 39 | 'user-select': userSelect,
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| 40 | '-ms-user-select': userSelect,
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| 41 | '-webkit-user-select': userSelect,
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| 42 | '-moz-user-select': userSelect
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| 43 | });
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| 44 | }
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| 45 | /**
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| 46 | * Toggles whether an element is visible while preserving its dimensions.
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| 47 | * @param element Element whose visibility to toggle
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| 48 | * @param enable Whether the element should be visible.
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| 49 | * @param importantProperties Properties to be set as `!important`.
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| 50 | * @docs-private
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| 51 | */
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| 52 | export function toggleVisibility(element, enable, importantProperties) {
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| 53 | extendStyles(element.style, {
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| 54 | position: enable ? '' : 'fixed',
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| 55 | top: enable ? '' : '0',
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| 56 | opacity: enable ? '' : '0',
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| 57 | left: enable ? '' : '-999em'
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| 58 | }, importantProperties);
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| 59 | }
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| 60 | /**
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| 61 | * Combines a transform string with an optional other transform
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| 62 | * that exited before the base transform was applied.
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| 63 | */
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| 64 | export function combineTransforms(transform, initialTransform) {
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| 65 | return initialTransform && initialTransform != 'none' ?
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| 66 | (transform + ' ' + initialTransform) :
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| 67 | transform;
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| 68 | }
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| 69 | //# 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