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copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\n * THE SOFTWARE.\n */\n\n/**\n * Determine whether the current browser supports passive event listeners, and\n * if so, use them.\n */\nexport function applyPassive(globalObj: Window = window):\n boolean | EventListenerOptions {\n return supportsPassiveOption(globalObj) ?\n {passive: true} as AddEventListenerOptions :\n false;\n}\n\nfunction supportsPassiveOption(globalObj: Window = window): boolean {\n // See\n // https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener\n let passiveSupported = false;\n\n try {\n const options = {\n // This function will be called when the browser\n // attempts to access the passive property.\n get passive() {\n passiveSupported = true;\n return false;\n }\n };\n\n const handler = () => {};\n globalObj.document.addEventListener('test', handler, options);\n globalObj.document.removeEventListener(\n 'test', handler, options as EventListenerOptions);\n } catch (err) {\n passiveSupported = false;\n }\n\n return passiveSupported;\n}\n","/**\n * @license\n * Copyright 2020 Google Inc.\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to deal\n * in the Software without restriction, including without limitation the rights\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\n * copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\n * THE SOFTWARE.\n */\n\nconst FOCUS_SENTINEL_CLASS = 'mdc-dom-focus-sentinel';\n\n/**\n * Utility to trap focus in a given root element, e.g. for modal components such\n * as dialogs. The root should have at least one focusable child element,\n * for setting initial focus when trapping focus.\n * Also tracks the previously focused element, and restores focus to that\n * element when releasing focus.\n */\nexport class FocusTrap {\n // Previously focused element before trapping focus.\n private elFocusedBeforeTrapFocus: HTMLElement|null = null;\n\n constructor(\n private readonly root: HTMLElement,\n private readonly options: FocusOptions = {}) {}\n\n /**\n * Traps focus in `root`. 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Also restores focus to the previously focused\n * element.\n */\n releaseFocus() {\n [].slice.call(this.root.querySelectorAll(`.${FOCUS_SENTINEL_CLASS}`))\n .forEach((sentinelEl: HTMLElement) => {\n sentinelEl.parentElement!.removeChild(sentinelEl);\n });\n\n if (!this.options.skipRestoreFocus && this.elFocusedBeforeTrapFocus) {\n this.elFocusedBeforeTrapFocus.focus();\n }\n }\n\n /**\n * Wraps tab focus within `el` by adding two hidden sentinel divs which are\n * used to mark the beginning and the end of the tabbable region. 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This is useful if the caller wants to handle restoring focus.\n skipRestoreFocus?: boolean;\n}\n","/**\n * @license\n * Copyright 2018 Google Inc.\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to deal\n * in the Software without restriction, including without limitation the rights\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\n * copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\n * THE SOFTWARE.\n */\n\nimport * as events from './events';\nimport * as focusTrap from './focus-trap';\nimport * as keyboard from './keyboard';\nimport * as ponyfill from './ponyfill';\n\nexport {events, focusTrap, keyboard, ponyfill};\n","/**\n * @license\n * Copyright 2020 Google Inc.\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to deal\n * in the Software without restriction, including without limitation the rights\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\n * copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\n * THE SOFTWARE.\n */\n\n/**\n * KEY provides normalized string values for keys.\n */\nexport const KEY = {\n UNKNOWN: 'Unknown',\n BACKSPACE: 'Backspace',\n ENTER: 'Enter',\n SPACEBAR: 'Spacebar',\n PAGE_UP: 'PageUp',\n PAGE_DOWN: 'PageDown',\n END: 'End',\n HOME: 'Home',\n ARROW_LEFT: 'ArrowLeft',\n ARROW_UP: 'ArrowUp',\n ARROW_RIGHT: 'ArrowRight',\n ARROW_DOWN: 'ArrowDown',\n DELETE: 'Delete',\n ESCAPE: 'Escape',\n TAB: 'Tab',\n};\n\nconst normalizedKeys = new Set<string>();\n// IE11 has no support for new Map with iterable so we need to initialize this\n// by hand.\nnormalizedKeys.add(KEY.BACKSPACE);\nnormalizedKeys.add(KEY.ENTER);\nnormalizedKeys.add(KEY.SPACEBAR);\nnormalizedKeys.add(KEY.PAGE_UP);\nnormalizedKeys.add(KEY.PAGE_DOWN);\nnormalizedKeys.add(KEY.END);\nnormalizedKeys.add(KEY.HOME);\nnormalizedKeys.add(KEY.ARROW_LEFT);\nnormalizedKeys.add(KEY.ARROW_UP);\nnormalizedKeys.add(KEY.ARROW_RIGHT);\nnormalizedKeys.add(KEY.ARROW_DOWN);\nnormalizedKeys.add(KEY.DELETE);\nnormalizedKeys.add(KEY.ESCAPE);\nnormalizedKeys.add(KEY.TAB);\n\nconst KEY_CODE = {\n BACKSPACE: 8,\n ENTER: 13,\n SPACEBAR: 32,\n PAGE_UP: 33,\n PAGE_DOWN: 34,\n END: 35,\n HOME: 36,\n ARROW_LEFT: 37,\n ARROW_UP: 38,\n ARROW_RIGHT: 39,\n ARROW_DOWN: 40,\n DELETE: 46,\n ESCAPE: 27,\n TAB: 9,\n};\n\nconst mappedKeyCodes = new Map<number, string>();\n// IE11 has no support for new Map with iterable so we need to initialize this\n// by hand.\nmappedKeyCodes.set(KEY_CODE.BACKSPACE, KEY.BACKSPACE);\nmappedKeyCodes.set(KEY_CODE.ENTER, KEY.ENTER);\nmappedKeyCodes.set(KEY_CODE.SPACEBAR, KEY.SPACEBAR);\nmappedKeyCodes.set(KEY_CODE.PAGE_UP, KEY.PAGE_UP);\nmappedKeyCodes.set(KEY_CODE.PAGE_DOWN, KEY.PAGE_DOWN);\nmappedKeyCodes.set(KEY_CODE.END, KEY.END);\nmappedKeyCodes.set(KEY_CODE.HOME, KEY.HOME);\nmappedKeyCodes.set(KEY_CODE.ARROW_LEFT, KEY.ARROW_LEFT);\nmappedKeyCodes.set(KEY_CODE.ARROW_UP, KEY.ARROW_UP);\nmappedKeyCodes.set(KEY_CODE.ARROW_RIGHT, KEY.ARROW_RIGHT);\nmappedKeyCodes.set(KEY_CODE.ARROW_DOWN, KEY.ARROW_DOWN);\nmappedKeyCodes.set(KEY_CODE.DELETE, KEY.DELETE);\nmappedKeyCodes.set(KEY_CODE.ESCAPE, KEY.ESCAPE);\nmappedKeyCodes.set(KEY_CODE.TAB, KEY.TAB);\n\nconst navigationKeys = new Set<string>();\n// IE11 has no support for new Set with iterable so we need to initialize this\n// by hand.\nnavigationKeys.add(KEY.PAGE_UP);\nnavigationKeys.add(KEY.PAGE_DOWN);\nnavigationKeys.add(KEY.END);\nnavigationKeys.add(KEY.HOME);\nnavigationKeys.add(KEY.ARROW_LEFT);\nnavigationKeys.add(KEY.ARROW_UP);\nnavigationKeys.add(KEY.ARROW_RIGHT);\nnavigationKeys.add(KEY.ARROW_DOWN);\n\n/**\n * normalizeKey returns the normalized string for a navigational action.\n */\nexport function normalizeKey(evt: KeyboardEvent): string {\n const {key} = evt;\n // If the event already has a normalized key, return it\n if (normalizedKeys.has(key)) {\n return key;\n }\n\n // tslint:disable-next-line:deprecation\n const mappedKey = mappedKeyCodes.get(evt.keyCode);\n if (mappedKey) {\n return mappedKey;\n }\n return KEY.UNKNOWN;\n}\n\n/**\n * isNavigationEvent returns whether the event is a navigation event\n */\nexport function isNavigationEvent(evt: KeyboardEvent): boolean {\n return navigationKeys.has(normalizeKey(evt));\n}\n","/**\n * @license\n * Copyright 2018 Google Inc.\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to deal\n * in the Software without restriction, including without limitation the rights\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\n * copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\n * THE SOFTWARE.\n */\n\n/**\n * @fileoverview A \"ponyfill\" is a polyfill that doesn't modify the global prototype chain.\n * This makes ponyfills safer than traditional polyfills, especially for libraries like MDC.\n */\n\nexport function closest(element: Element, selector: string): Element | null {\n if (element.closest) {\n return element.closest(selector);\n }\n\n let el: Element | null = element;\n while (el) {\n if (matches(el, selector)) {\n return el;\n }\n el = el.parentElement;\n }\n return null;\n}\n\nexport function matches(element: Element, selector: string): boolean {\n const nativeMatches = element.matches\n || element.webkitMatchesSelector\n || (element as any).msMatchesSelector;\n return nativeMatches.call(element, selector);\n}\n\n/**\n * Used to compute the estimated scroll width of elements. When an element is\n * hidden due to display: none; being applied to a parent element, the width is\n * returned as 0. However, the element will have a true width once no longer\n * inside a display: none context. This method computes an estimated width when\n * the element is hidden or returns the true width when the element is visble.\n * @param {Element} element the element whose width to estimate\n */\nexport function estimateScrollWidth(element: Element): number {\n // Check the offsetParent. If the element inherits display: none from any\n // parent, the offsetParent property will be null (see\n // https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/offsetParent).\n // This check ensures we only clone the node when necessary.\n const htmlEl = element as HTMLElement;\n if (htmlEl.offsetParent !== null) {\n return htmlEl.scrollWidth;\n }\n\n const clone = htmlEl.cloneNode(true) as HTMLElement;\n clone.style.setProperty('position', 'absolute');\n clone.style.setProperty('transform', 'translate(-9999px, -9999px)');\n document.documentElement.appendChild(clone);\n const scrollWidth = clone.scrollWidth;\n document.documentElement.removeChild(clone);\n return scrollWidth;\n}\n"],"sourceRoot":""} |