@angular/cdk
Version:
Angular Material Component Development Kit
83 lines • 12.9 kB
JavaScript
/**
* @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
*/
/** Cached result of the way the browser handles the horizontal scroll axis in RTL mode. */
let rtlScrollAxisType;
/** Cached result of the check that indicates whether the browser supports scroll behaviors. */
let scrollBehaviorSupported;
/** Check whether the browser supports scroll behaviors. */
export function supportsScrollBehavior() {
if (scrollBehaviorSupported == null) {
// If we're not in the browser, it can't be supported.
if (typeof document !== 'object' || !document) {
scrollBehaviorSupported = false;
}
// If the element can have a `scrollBehavior` style, we can be sure that it's supported.
if ('scrollBehavior' in document.documentElement.style) {
scrollBehaviorSupported = true;
}
else {
// At this point we have 3 possibilities: `scrollTo` isn't supported at all, it's
// supported but it doesn't handle scroll behavior, or it has been polyfilled.
const scrollToFunction = Element.prototype.scrollTo;
if (scrollToFunction) {
// We can detect if the function has been polyfilled by calling `toString` on it. Native
// functions are obfuscated using `[native code]`, whereas if it was overwritten we'd get
// the actual function source. Via https://davidwalsh.name/detect-native-function. Consider
// polyfilled functions as supporting scroll behavior.
scrollBehaviorSupported = !/\{\s*\[native code\]\s*\}/.test(scrollToFunction.toString());
}
else {
scrollBehaviorSupported = false;
}
}
}
return scrollBehaviorSupported;
}
/**
* Checks the type of RTL scroll axis used by this browser. As of time of writing, Chrome is NORMAL,
* Firefox & Safari are NEGATED, and IE & Edge are INVERTED.
*/
export function getRtlScrollAxisType() {
// We can't check unless we're on the browser. Just assume 'normal' if we're not.
if (typeof document !== 'object' || !document) {
return 0 /* NORMAL */;
}
if (rtlScrollAxisType == null) {
// Create a 1px wide scrolling container and a 2px wide content element.
const scrollContainer = document.createElement('div');
const containerStyle = scrollContainer.style;
scrollContainer.dir = 'rtl';
containerStyle.width = '1px';
containerStyle.overflow = 'auto';
containerStyle.visibility = 'hidden';
containerStyle.pointerEvents = 'none';
containerStyle.position = 'absolute';
const content = document.createElement('div');
const contentStyle = content.style;
contentStyle.width = '2px';
contentStyle.height = '1px';
scrollContainer.appendChild(content);
document.body.appendChild(scrollContainer);
rtlScrollAxisType = 0 /* NORMAL */;
// The viewport starts scrolled all the way to the right in RTL mode. If we are in a NORMAL
// browser this would mean that the scrollLeft should be 1. If it's zero instead we know we're
// dealing with one of the other two types of browsers.
if (scrollContainer.scrollLeft === 0) {
// In a NEGATED browser the scrollLeft is always somewhere in [-maxScrollAmount, 0]. For an
// INVERTED browser it is always somewhere in [0, maxScrollAmount]. We can determine which by
// setting to the scrollLeft to 1. This is past the max for a NEGATED browser, so it will
// return 0 when we read it again.
scrollContainer.scrollLeft = 1;
rtlScrollAxisType =
scrollContainer.scrollLeft === 0 ? 1 /* NEGATED */ : 2 /* INVERTED */;
}
scrollContainer.parentNode.removeChild(scrollContainer);
}
return rtlScrollAxisType;
}
//# sourceMappingURL=data:application/json;base64,{"version":3,"file":"scrolling.js","sourceRoot":"","sources":["../../../../../../../src/cdk/platform/features/scrolling.ts"],"names":[],"mappings":"AAAA;;;;;;GAMG;AAqBH,2FAA2F;AAC3F,IAAI,iBAA8C,CAAC;AAEnD,+FAA+F;AAC/F,IAAI,uBAA0C,CAAC;AAE/C,2DAA2D;AAC3D,MAAM,UAAU,sBAAsB;IACpC,IAAI,uBAAuB,IAAI,IAAI,EAAE;QACnC,sDAAsD;QACtD,IAAI,OAAO,QAAQ,KAAK,QAAQ,IAAI,CAAC,QAAQ,EAAE;YAC7C,uBAAuB,GAAG,KAAK,CAAC;SACjC;QAED,wFAAwF;QACxF,IAAI,gBAAgB,IAAI,QAAQ,CAAC,eAAgB,CAAC,KAAK,EAAE;YACvD,uBAAuB,GAAG,IAAI,CAAC;SAChC;aAAM;YACL,iFAAiF;YACjF,8EAA8E;YAC9E,MAAM,gBAAgB,GAAuB,OAAO,CAAC,SAAS,CAAC,QAAQ,CAAC;YAExE,IAAI,gBAAgB,EAAE;gBACpB,wFAAwF;gBACxF,yFAAyF;gBACzF,2FAA2F;gBAC3F,sDAAsD;gBACtD,uBAAuB,GAAG,CAAC,2BAA2B,CAAC,IAAI,CAAC,gBAAgB,CAAC,QAAQ,EAAE,CAAC,CAAC;aAC1F;iBAAM;gBACL,uBAAuB,GAAG,KAAK,CAAC;aACjC;SACF;KACF;IAED,OAAO,uBAAuB,CAAC;AACjC,CAAC;AAED;;;GAGG;AACH,MAAM,UAAU,oBAAoB;IAClC,iFAAiF;IACjF,IAAI,OAAO,QAAQ,KAAK,QAAQ,IAAI,CAAC,QAAQ,EAAE;QAC7C,sBAAgC;KACjC;IAED,IAAI,iBAAiB,IAAI,IAAI,EAAE;QAC7B,wEAAwE;QACxE,MAAM,eAAe,GAAG,QAAQ,CAAC,aAAa,CAAC,KAAK,CAAC,CAAC;QACtD,MAAM,cAAc,GAAG,eAAe,CAAC,KAAK,CAAC;QAC7C,eAAe,CAAC,GAAG,GAAG,KAAK,CAAC;QAC5B,cAAc,CAAC,KAAK,GAAG,KAAK,CAAC;QAC7B,cAAc,CAAC,QAAQ,GAAG,MAAM,CAAC;QACjC,cAAc,CAAC,UAAU,GAAG,QAAQ,CAAC;QACrC,cAAc,CAAC,aAAa,GAAG,MAAM,CAAC;QACtC,cAAc,CAAC,QAAQ,GAAG,UAAU,CAAC;QAErC,MAAM,OAAO,GAAG,QAAQ,CAAC,aAAa,CAAC,KAAK,CAAC,CAAC;QAC9C,MAAM,YAAY,GAAG,OAAO,CAAC,KAAK,CAAC;QACnC,YAAY,CAAC,KAAK,GAAG,KAAK,CAAC;QAC3B,YAAY,CAAC,MAAM,GAAG,KAAK,CAAC;QAE5B,eAAe,CAAC,WAAW,CAAC,OAAO,CAAC,CAAC;QACrC,QAAQ,CAAC,IAAI,CAAC,WAAW,CAAC,eAAe,CAAC,CAAC;QAE3C,iBAAiB,iBAA2B,CAAC;QAE7C,2FAA2F;QAC3F,8FAA8F;QAC9F,uDAAuD;QACvD,IAAI,eAAe,CAAC,UAAU,KAAK,CAAC,EAAE;YACpC,2FAA2F;YAC3F,6FAA6F;YAC7F,yFAAyF;YACzF,kCAAkC;YAClC,eAAe,CAAC,UAAU,GAAG,CAAC,CAAC;YAC/B,iBAAiB;gBACb,eAAe,CAAC,UAAU,KAAK,CAAC,CAAC,CAAC,iBAA2B,CAAC,iBAA2B,CAAC;SAC/F;QAED,eAAe,CAAC,UAAW,CAAC,WAAW,CAAC,eAAe,CAAC,CAAC;KAC1D;IACD,OAAO,iBAAiB,CAAC;AAC3B,CAAC","sourcesContent":["/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\n/** The possible ways the browser may handle the horizontal scroll axis in RTL languages. */\nexport const enum RtlScrollAxisType {\n  /**\n   * scrollLeft is 0 when scrolled all the way left and (scrollWidth - clientWidth) when scrolled\n   * all the way right.\n   */\n  NORMAL,\n  /**\n   * scrollLeft is -(scrollWidth - clientWidth) when scrolled all the way left and 0 when scrolled\n   * all the way right.\n   */\n  NEGATED,\n  /**\n   * scrollLeft is (scrollWidth - clientWidth) when scrolled all the way left and 0 when scrolled\n   * all the way right.\n   */\n  INVERTED\n}\n\n/** Cached result of the way the browser handles the horizontal scroll axis in RTL mode. */\nlet rtlScrollAxisType: RtlScrollAxisType|undefined;\n\n/** Cached result of the check that indicates whether the browser supports scroll behaviors. */\nlet scrollBehaviorSupported: boolean|undefined;\n\n/** Check whether the browser supports scroll behaviors. */\nexport function supportsScrollBehavior(): boolean {\n  if (scrollBehaviorSupported == null) {\n    // If we're not in the browser, it can't be supported.\n    if (typeof document !== 'object' || !document) {\n      scrollBehaviorSupported = false;\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"]}