@blueprintjs/core
Version:
Core styles & components
95 lines • 4.77 kB
JavaScript
/*
* Copyright 2015 Palantir Technologies, Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var Spinner_1;
import * as tslib_1 from "tslib";
import classNames from "classnames";
import * as React from "react";
import { polyfill } from "react-lifecycles-compat";
import { AbstractPureComponent2, Classes } from "../../common";
import { SPINNER_WARN_CLASSES_SIZE } from "../../common/errors";
import { DISPLAYNAME_PREFIX } from "../../common/props";
import { clamp } from "../../common/utils";
// see http://stackoverflow.com/a/18473154/3124288 for calculating arc path
const R = 45;
const SPINNER_TRACK = `M 50,50 m 0,-${R} a ${R},${R} 0 1 1 0,${R * 2} a ${R},${R} 0 1 1 0,-${R * 2}`;
// unitless total length of SVG path, to which stroke-dash* properties are relative.
// https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/pathLength
// this value is the result of `<path d={SPINNER_TRACK} />.getTotalLength()` and works in all browsers:
const PATH_LENGTH = 280;
const MIN_SIZE = 10;
const STROKE_WIDTH = 4;
const MIN_STROKE_WIDTH = 16;
let Spinner = Spinner_1 = class Spinner extends AbstractPureComponent2 {
componentDidUpdate(prevProps) {
if (prevProps.value !== this.props.value) {
// IE/Edge: re-render after changing value to force SVG update
this.forceUpdate();
}
}
render() {
const { className, intent, value, tagName = "div" } = this.props;
const size = this.getSize();
const classes = classNames(Classes.SPINNER, Classes.intentClass(intent), { [Classes.SPINNER_NO_SPIN]: value != null }, className);
// keep spinner track width consistent at all sizes (down to about 10px).
const strokeWidth = Math.min(MIN_STROKE_WIDTH, (STROKE_WIDTH * Spinner_1.SIZE_LARGE) / size);
const strokeOffset = PATH_LENGTH - PATH_LENGTH * (value == null ? 0.25 : clamp(value, 0, 1));
// multiple DOM elements around SVG are necessary to properly isolate animation:
// - SVG elements in IE do not support anim/trans so they must be set on a parent HTML element.
// - SPINNER_ANIMATION isolates svg from parent display and is always centered inside root element.
return React.createElement(tagName, { className: classes }, React.createElement(tagName, { className: Classes.SPINNER_ANIMATION }, React.createElement("svg", { width: size, height: size, strokeWidth: strokeWidth.toFixed(2), viewBox: this.getViewBox(strokeWidth) },
React.createElement("path", { className: Classes.SPINNER_TRACK, d: SPINNER_TRACK }),
React.createElement("path", { className: Classes.SPINNER_HEAD, d: SPINNER_TRACK, pathLength: PATH_LENGTH, strokeDasharray: `${PATH_LENGTH} ${PATH_LENGTH}`, strokeDashoffset: strokeOffset }))));
}
validateProps({ className = "", size }) {
if (size != null && (className.indexOf(Classes.SMALL) >= 0 || className.indexOf(Classes.LARGE) >= 0)) {
console.warn(SPINNER_WARN_CLASSES_SIZE);
}
}
/**
* Resolve size to a pixel value.
* Size can be set by className, props, default, or minimum constant.
*/
getSize() {
const { className = "", size } = this.props;
if (size == null) {
// allow Classes constants to determine default size.
if (className.indexOf(Classes.SMALL) >= 0) {
return Spinner_1.SIZE_SMALL;
}
else if (className.indexOf(Classes.LARGE) >= 0) {
return Spinner_1.SIZE_LARGE;
}
return Spinner_1.SIZE_STANDARD;
}
return Math.max(MIN_SIZE, size);
}
/** Compute viewbox such that stroked track sits exactly at edge of image frame. */
getViewBox(strokeWidth) {
const radius = R + strokeWidth / 2;
const viewBoxX = (50 - radius).toFixed(2);
const viewBoxWidth = (radius * 2).toFixed(2);
return `${viewBoxX} ${viewBoxX} ${viewBoxWidth} ${viewBoxWidth}`;
}
};
Spinner.displayName = `${DISPLAYNAME_PREFIX}.Spinner`;
Spinner.SIZE_SMALL = 20;
Spinner.SIZE_STANDARD = 50;
Spinner.SIZE_LARGE = 100;
Spinner = Spinner_1 = tslib_1.__decorate([
polyfill
], Spinner);
export { Spinner };
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