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 | /** Cached result of the way the browser handles the horizontal scroll axis in RTL mode. */
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9 | let rtlScrollAxisType;
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10 | /** Cached result of the check that indicates whether the browser supports scroll behaviors. */
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11 | let scrollBehaviorSupported;
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12 | /** Check whether the browser supports scroll behaviors. */
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13 | export function supportsScrollBehavior() {
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14 | if (scrollBehaviorSupported == null) {
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15 | // If we're not in the browser, it can't be supported. Also check for `Element`, because
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16 | // some projects stub out the global `document` during SSR which can throw us off.
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17 | if (typeof document !== 'object' || !document || typeof Element !== 'function' || !Element) {
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18 | scrollBehaviorSupported = false;
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19 | return scrollBehaviorSupported;
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20 | }
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21 | // If the element can have a `scrollBehavior` style, we can be sure that it's supported.
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22 | if ('scrollBehavior' in document.documentElement.style) {
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23 | scrollBehaviorSupported = true;
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24 | }
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25 | else {
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26 | // At this point we have 3 possibilities: `scrollTo` isn't supported at all, it's
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27 | // supported but it doesn't handle scroll behavior, or it has been polyfilled.
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28 | const scrollToFunction = Element.prototype.scrollTo;
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29 | if (scrollToFunction) {
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30 | // We can detect if the function has been polyfilled by calling `toString` on it. Native
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31 | // functions are obfuscated using `[native code]`, whereas if it was overwritten we'd get
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32 | // the actual function source. Via https://davidwalsh.name/detect-native-function. Consider
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33 | // polyfilled functions as supporting scroll behavior.
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34 | scrollBehaviorSupported = !/\{\s*\[native code\]\s*\}/.test(scrollToFunction.toString());
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35 | }
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36 | else {
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37 | scrollBehaviorSupported = false;
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38 | }
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39 | }
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40 | }
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41 | return scrollBehaviorSupported;
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42 | }
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43 | /**
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44 | * Checks the type of RTL scroll axis used by this browser. As of time of writing, Chrome is NORMAL,
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45 | * Firefox & Safari are NEGATED, and IE & Edge are INVERTED.
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46 | */
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47 | export function getRtlScrollAxisType() {
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48 | // We can't check unless we're on the browser. Just assume 'normal' if we're not.
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49 | if (typeof document !== 'object' || !document) {
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50 | return 0 /* NORMAL */;
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51 | }
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52 | if (rtlScrollAxisType == null) {
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53 | // Create a 1px wide scrolling container and a 2px wide content element.
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54 | const scrollContainer = document.createElement('div');
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55 | const containerStyle = scrollContainer.style;
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56 | scrollContainer.dir = 'rtl';
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57 | containerStyle.width = '1px';
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58 | containerStyle.overflow = 'auto';
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59 | containerStyle.visibility = 'hidden';
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60 | containerStyle.pointerEvents = 'none';
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61 | containerStyle.position = 'absolute';
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62 | const content = document.createElement('div');
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63 | const contentStyle = content.style;
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64 | contentStyle.width = '2px';
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65 | contentStyle.height = '1px';
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66 | scrollContainer.appendChild(content);
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67 | document.body.appendChild(scrollContainer);
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68 | rtlScrollAxisType = 0 /* NORMAL */;
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69 | // The viewport starts scrolled all the way to the right in RTL mode. If we are in a NORMAL
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70 | // browser this would mean that the scrollLeft should be 1. If it's zero instead we know we're
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71 | // dealing with one of the other two types of browsers.
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72 | if (scrollContainer.scrollLeft === 0) {
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73 | // In a NEGATED browser the scrollLeft is always somewhere in [-maxScrollAmount, 0]. For an
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74 | // INVERTED browser it is always somewhere in [0, maxScrollAmount]. We can determine which by
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75 | // setting to the scrollLeft to 1. This is past the max for a NEGATED browser, so it will
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76 | // return 0 when we read it again.
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77 | scrollContainer.scrollLeft = 1;
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78 | rtlScrollAxisType =
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79 | scrollContainer.scrollLeft === 0 ? 1 /* NEGATED */ : 2 /* INVERTED */;
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80 | }
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81 | scrollContainer.parentNode.removeChild(scrollContainer);
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82 | }
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83 | return rtlScrollAxisType;
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84 | }
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Also check for `Element`, because\n    // some projects stub out the global `document` during SSR which can throw us off.\n    if (typeof document !== 'object' || !document || typeof Element !== 'function' || !Element) {\n      scrollBehaviorSupported = false;\n      return scrollBehaviorSupported;\n    }\n\n    // If the element can have a `scrollBehavior` style, we can be sure that it's supported.\n    if ('scrollBehavior' in document.documentElement!.style) {\n      scrollBehaviorSupported = true;\n    } else {\n      // At this point we have 3 possibilities: `scrollTo` isn't supported at all, it's\n      // supported but it doesn't handle scroll behavior, or it has been polyfilled.\n      const scrollToFunction: Function|undefined = Element.prototype.scrollTo;\n\n      if (scrollToFunction) {\n        // We can detect if the function has been polyfilled by calling `toString` on it. Native\n        // functions are obfuscated using `[native code]`, whereas if it was overwritten we'd get\n        // the actual function source. Via https://davidwalsh.name/detect-native-function. Consider\n        // polyfilled functions as supporting scroll behavior.\n        scrollBehaviorSupported = !/\\{\\s*\\[native code\\]\\s*\\}/.test(scrollToFunction.toString());\n      } else {\n        scrollBehaviorSupported = false;\n      }\n    }\n  }\n\n  return scrollBehaviorSupported;\n}\n\n/**\n * Checks the type of RTL scroll axis used by this browser. As of time of writing, Chrome is NORMAL,\n * Firefox & Safari are NEGATED, and IE & Edge are INVERTED.\n */\nexport function getRtlScrollAxisType(): RtlScrollAxisType {\n  // We can't check unless we're on the browser. Just assume 'normal' if we're not.\n  if (typeof document !== 'object' || !document) {\n    return RtlScrollAxisType.NORMAL;\n  }\n\n  if (rtlScrollAxisType == null) {\n    // Create a 1px wide scrolling container and a 2px wide content element.\n    const scrollContainer = document.createElement('div');\n    const containerStyle = scrollContainer.style;\n    scrollContainer.dir = 'rtl';\n    containerStyle.width = '1px';\n    containerStyle.overflow = 'auto';\n    containerStyle.visibility = 'hidden';\n    containerStyle.pointerEvents = 'none';\n    containerStyle.position = 'absolute';\n\n    const content = document.createElement('div');\n    const contentStyle = content.style;\n    contentStyle.width = '2px';\n    contentStyle.height = '1px';\n\n    scrollContainer.appendChild(content);\n    document.body.appendChild(scrollContainer);\n\n    rtlScrollAxisType = RtlScrollAxisType.NORMAL;\n\n    // The viewport starts scrolled all the way to the right in RTL mode. If we are in a NORMAL\n    // browser this would mean that the scrollLeft should be 1. If it's zero instead we know we're\n    // dealing with one of the other two types of browsers.\n    if (scrollContainer.scrollLeft === 0) {\n      // In a NEGATED browser the scrollLeft is always somewhere in [-maxScrollAmount, 0]. For an\n      // INVERTED browser it is always somewhere in [0, maxScrollAmount]. We can determine which by\n      // setting to the scrollLeft to 1. This is past the max for a NEGATED browser, so it will\n      // return 0 when we read it again.\n      scrollContainer.scrollLeft = 1;\n      rtlScrollAxisType =\n          scrollContainer.scrollLeft === 0 ? RtlScrollAxisType.NEGATED : RtlScrollAxisType.INVERTED;\n    }\n\n    scrollContainer.parentNode!.removeChild(scrollContainer);\n  }\n  return rtlScrollAxisType;\n}\n"]} |
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