@smui/ripple
Version:
Svelte Material UI - Ripple
73 lines • 3.1 kB
JavaScript
/**
* @license
* Copyright 2016 Google Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/**
* Stores result from supportsCssVariables to avoid redundant processing to
* detect CSS custom variable support.
*/
let supportsCssVariablesCache;
/** Checks if the window supports CSS Variables */
export function supportsCssVariables(windowObj, forceRefresh = false) {
const { CSS } = windowObj;
let supportsCssVars = supportsCssVariablesCache;
if (typeof supportsCssVariablesCache === 'boolean' && !forceRefresh) {
return supportsCssVariablesCache;
}
const supportsFunctionPresent = CSS && typeof CSS.supports === 'function';
if (!supportsFunctionPresent) {
return false;
}
const explicitlySupportsCssVars = CSS.supports('--css-vars', 'yes');
// See: https://bugs.webkit.org/show_bug.cgi?id=154669
// See: README section on Safari
const weAreFeatureDetectingSafari10plus = CSS.supports('(--css-vars: yes)') && CSS.supports('color', '#00000000');
supportsCssVars =
explicitlySupportsCssVars || weAreFeatureDetectingSafari10plus;
if (!forceRefresh) {
supportsCssVariablesCache = supportsCssVars;
}
return supportsCssVars;
}
/** Gets the normalized events coordinates */
export function getNormalizedEventCoords(event, pageOffset, clientRect) {
if (!event) {
return { x: 0, y: 0 };
}
const { x, y } = pageOffset;
const documentX = x + clientRect.left;
const documentY = y + clientRect.top;
let normalizedX;
let normalizedY;
// Determine touch point relative to the ripple container.
if (event.type === 'touchstart') {
const touchEvent = event;
normalizedX = touchEvent.changedTouches[0].pageX - documentX;
normalizedY = touchEvent.changedTouches[0].pageY - documentY;
}
else {
const mouseEvent = event;
normalizedX = mouseEvent.pageX - documentX;
normalizedY = mouseEvent.pageY - documentY;
}
return { x: normalizedX, y: normalizedY };
}
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