| /** |
| * @license |
| * Copyright Google LLC All Rights Reserved. |
| * |
| * Use of this source code is governed by an MIT-style license that can be |
| * found in the LICENSE file at https://angular.io/license |
| */ |
| /** |
| * Shallow-extends a stylesheet object with another stylesheet object. |
| * @docs-private |
| */ |
| export function extendStyles(dest, source) { |
| for (let key in source) { |
| if (source.hasOwnProperty(key)) { |
| dest[key] = source[key]; |
| } |
| } |
| return dest; |
| } |
| /** |
| * Toggles whether the native drag interactions should be enabled for an element. |
| * @param element Element on which to toggle the drag interactions. |
| * @param enable Whether the drag interactions should be enabled. |
| * @docs-private |
| */ |
| export function toggleNativeDragInteractions(element, enable) { |
| const userSelect = enable ? '' : 'none'; |
| extendStyles(element.style, { |
| touchAction: enable ? '' : 'none', |
| webkitUserDrag: enable ? '' : 'none', |
| webkitTapHighlightColor: enable ? '' : 'transparent', |
| userSelect: userSelect, |
| msUserSelect: userSelect, |
| webkitUserSelect: userSelect, |
| MozUserSelect: userSelect |
| }); |
| } |
| /** |
| * Toggles whether an element is visible while preserving its dimensions. |
| * @param element Element whose visibility to toggle |
| * @param enable Whether the element should be visible. |
| * @docs-private |
| */ |
| export function toggleVisibility(element, enable) { |
| const styles = element.style; |
| styles.position = enable ? '' : 'fixed'; |
| styles.top = styles.opacity = enable ? '' : '0'; |
| styles.left = enable ? '' : '-999em'; |
| } |
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