b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
1015 lines
23 KiB
JavaScript
Executable file
1015 lines
23 KiB
JavaScript
Executable file
;(function(define){'use strict';define(function(require,exports,module){
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/**
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* Dependencies
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*/
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var component = require('gaia-component');
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var fontFit = require('font-fit');
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/**
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* Load 'gaia-icons' font-family
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*/
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require('gaia-icons');
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/**
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* Simple logger (toggle 0)
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*
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* @type {Function}
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*/
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var debug = 0 ? console.log.bind(console) : function() {};
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/**
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* Supported action types
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*
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* @type {Object}
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*/
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const KNOWN_ACTIONS = {
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menu: 'menu',
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back: 'back',
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close: 'close'
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};
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/**
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* The default title font.
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*
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* @type {String}
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*/
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const TITLE_FONT = 'italic 300 24px FiraSans';
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/**
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* The padding (start/end) used if
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* the title needs padding away from
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* the edge of the header.
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*
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* @type {Number}
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*/
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const TITLE_PADDING = 10;
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/**
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* This is the minimum font size that we can take
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* when the header title is centered in the window.
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*/
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const MINIMUM_FONT_SIZE_CENTERED = 20;
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/**
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* This is the minimum font size that we can take
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* when the header title is not centered in the window.
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*/
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const MINIMUM_FONT_SIZE_UNCENTERED = 18;
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/**
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* This is the maximum font size that we can use for
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* the heade title.
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*/
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const MAXIMUM_FONT_SIZE = 23;
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/**
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* Register the element.
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*
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* @return {Element} constructor
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*/
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module.exports = component.register('gaia-header', {
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/**
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* Called when the element is first created.
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*
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* Here we create the shadow-root and
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* inject our template into it.
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*
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* @private
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*/
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created: function() {
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debug('created');
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this.setupShadowRoot();
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// Elements
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this.els = {
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actionButton: this.shadowRoot.querySelector('.action-button'),
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buttons: this.querySelectorAll('button, a'),
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titles: this.querySelectorAll('h1')
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};
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// Events
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this.els.actionButton.addEventListener('click', e => this.onActionButtonClick(e));
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this.observer = new MutationObserver(this.onMutation.bind(this));
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// Properties
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this.titleEnd = this.getAttribute('title-end');
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this.titleStart = this.getAttribute('title-start');
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this.noFontFit = this.getAttribute('no-font-fit');
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this.notFlush = this.hasAttribute('not-flush');
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this.action = this.getAttribute('action');
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this.unresolved = {};
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this.pending = {};
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this._resizeThrottlingId = null;
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// bind the listener in advance so that we can remove it when detaching.
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this.onResize = this.onResize.bind(this);
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},
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/**
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* Called when the element is
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* attached to the DOM.
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*
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* Run fontFit when we have DOM
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* context and start listening
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* for DOM mutations.
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*
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* We run font-fit on next tick to
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* avoid reading from the DOM when
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* it may not be loaded yet.
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*
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* @private
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*/
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attached: function() {
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debug('attached');
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this.runFontFitSoon();
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this.observerStart();
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window.addEventListener('resize', this.onResize);
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},
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/**
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* Called when the element is
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* detached from the DOM.
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*
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* @private
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*/
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detached: function() {
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debug('detached');
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window.removeEventListener('resize', this.onResize);
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this.observerStop();
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this.clearPending();
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},
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/**
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* Clears pending `.nextTick()`s and requestAnimationFrame's.
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*
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* @private
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*/
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clearPending: function() {
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for (var key in this.pending) {
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this.pending[key].clear();
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delete this.pending[key];
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}
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window.cancelAnimationFrame(this._resizeThrottlingId);
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this._resizeThrottlingId = null;
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},
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/**
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* Run the font-fit logic and
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* center the title.
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*
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* The styles are calculated synchronously,
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* but then set asynchronously. This means
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* this function can be hammered in one turn,
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* and the title styles will only be written
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* once, with the latest styles.
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*
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* @return {Promise}
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* @public
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*/
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runFontFit: function() {
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debug('run font-fit');
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// Nothing is run if `no-font-fit` attribute
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// is present. We don't `reject()` as this
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// isn't technically an error state.
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if (this.noFontFit) { return Promise.resolve(); }
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var titles = this.els.titles;
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var space = this.getTitleSpace();
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var styles = [].map.call(titles, el => this.getTitleStyle(el, space));
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// Update the title styles using the latest
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// styles. This function can be called many
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// times but will only run once in each tick.
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return this.setTitleStylesSoon(styles);
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},
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/**
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* Microtask debounced `runFontFit`
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*
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* @private
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*/
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runFontFitSoon: function() {
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debug('run font-fit soon');
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if (this.pending.runFontFitSoon) { return; }
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this.pending.runFontFitSoon = this.nextTick(() => {
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delete this.pending.runFontFitSoon;
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this.runFontFit();
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});
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},
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/**
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* Get the style properties required
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* to fit and position the title text.
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*
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* @param {HTMLH1Element} el
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* @param {Number} space
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* @return {Object} {fontSize, marginStart, overflowing, id}
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* @private
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*/
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getTitleStyle: function(el, space) {
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debug('get el style', el, space);
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var text = el.textContent;
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var styleId = space.start + text + space.end + '#' + space.value;
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// Bail when there's no text (or just whitespace)
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if (!text || !text.trim()) { return debug('exit: no text'); }
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// If neither the text or the titleSpace
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// changed, there's no reason to continue.
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if (getStyleId(el) === styleId) { return debug('exit: no change'); }
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var marginStart = this.getTitleMarginStart();
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var textSpace = space.value - Math.abs(marginStart);
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var fontFitResult = this.fontFit(text, textSpace, {
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min: MINIMUM_FONT_SIZE_CENTERED
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});
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var overflowing = fontFitResult.overflowing;
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var padding = { start: 0, end: 0 };
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// If the text is overflowing in the
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// centered title, we remove centering
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// to free up space, rerun fontFit to
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// get a fontSize which fits this space.
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if (overflowing) {
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debug('title overflowing');
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padding.start = !space.start ? TITLE_PADDING : 0;
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padding.end = !space.end ? TITLE_PADDING : 0;
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textSpace = space.value - padding.start - padding.end;
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fontFitResult = this.fontFit(text, textSpace);
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marginStart = 0;
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}
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return {
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id: styleId,
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fontSize: fontFitResult.fontSize,
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marginStart: marginStart,
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overflowing: overflowing,
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padding: padding
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};
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},
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/**
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* Set's styles on the title elements.
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*
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* If there is already an unresolved Promise
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* we return it instead of scheduling another.
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* This means that the function can be hammered
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* in the same sync-turn and will only run
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* once (like a debounce).
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*
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* @param {Array} styles
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* @return {Promise}
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*/
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setTitleStylesSoon: function(styles) {
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debug('set title styles soon', styles);
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var key = 'setStyleTitlesSoon';
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// Always update styles
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this._titleStyles = styles;
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// Return existing unresolved
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// promise, or make a new one
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return this.unresolved[key] = this.unresolved[key] || new Promise((resolve) => {
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this.pending[key] = this.nextTick(() => {
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var styles = this._titleStyles;
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var els = this.els.titles;
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[].forEach.call(els, (el, i) => {
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if (!styles[i]) { return debug('exit'); }
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this.setTitleStyle(el, styles[i]);
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});
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// Clean up
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delete this._titleStyles;
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delete this.unresolved[key];
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delete this.pending[key];
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resolve();
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});
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});
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},
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/**
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* Fit text and center a title between
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* the buttons before and after.
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*
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* Right now, because gaia-header is not
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* fully rtl-compatible (due to Gaia),
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* we're using `marginLeft` etc. These
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* will be changed to `marginStart` etc
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* when we become fully RTL.
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*
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* @param {HTMLH1Element} title
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* @param {Number} space
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* @private
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*/
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setTitleStyle: function(el, style) {
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debug('set title style', style);
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this.observerStop();
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el.style.marginLeft = style.marginStart + 'px';
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el.style.paddingLeft = style.padding.start + 'px';
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el.style.paddingRight = style.padding.end + 'px';
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el.style.fontSize = style.fontSize + 'px';
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setStyleId(el, style.id);
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this.observerStart();
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},
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/**
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* Run font-fit on a title with
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* the given amount of content space.
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* @param {String} text
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* @param {Number} space
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* @param {Object} optional {[min]}
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* @return {Object} {fontSize, textWidth}
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* @private
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*/
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fontFit: function(text, space, opts = {}) {
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debug('font fit:', text, space, opts);
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var fontFitArgs = {
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font: TITLE_FONT,
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min: opts.min || MINIMUM_FONT_SIZE_UNCENTERED,
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max: MAXIMUM_FONT_SIZE,
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text: text,
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space: space
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};
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return fontFit(fontFitArgs);
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},
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/**
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* Start the observer listening
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* for DOM mutations.
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* Start the listener for 'resize' event.
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*
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* @private
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*/
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observerStart: function() {
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if (this.observing) { return; }
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this.observer.observe(this, {
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childList: true,
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attributes: true,
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subtree: true
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});
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this.observing = true;
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debug('observer started');
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},
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/**
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* Stop the observer listening
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* for DOM mutations.
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*
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* @private
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*/
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observerStop: function() {
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if (!this.observing) { return; }
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this.observer.disconnect();
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this.observing = false;
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debug('observer stopped');
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},
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/**
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* Handle 'resize' events.
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* @param {Event} The DOM Event that's being handled.
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*
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* @private
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*/
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onResize: function(e) {
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debug('onResize', this._resizeThrottlingId);
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if (this._resizeThrottlingId !== null) {
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return;
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}
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/* Resize events can arrive at a very high rate, so we're trying to
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* reasonably throttle these events. */
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this._resizeThrottlingId = window.requestAnimationFrame(() => {
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this._resizeThrottlingId = null;
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this.runFontFitSoon();
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});
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},
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/**
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* When the components DOM changes we
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* call `.runFontFit()` (sync).
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*
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* If the `textContent` is changed in a
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* mutation observer just after attaching,
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* we end up running twice.
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*
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* If there is a pending async .runFontFit(),
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* then we don't want to run it now.
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*
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* @param {Array} mutations
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* @private
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*/
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onMutation: function(mutations) {
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debug('on mutation', mutations);
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if (!this.pending.runFontFitSoon) { this.runFontFit(); }
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},
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/**
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* Get the title width.
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*
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* Returns the space available for <h1>.
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*
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* @return {Number}
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* @private
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*/
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getTitleSpace: function() {
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var start = this.titleStart;
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var end = this.titleEnd;
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var space = this.getWidth() - start - end;
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var result = {
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value: space,
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start: start,
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end: end
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};
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debug('get title space', result);
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return result;
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},
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/**
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* Get the width of the component.
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*
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* For performance reasons we make the
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* assumption that the width is the same
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* as `window.innerWidth` unless the
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* `not-flush` attribute is used.
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*
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* @return {Number}
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* @private
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*/
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getWidth: function() {
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var value = this.notFlush
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? this.clientWidth
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: window.innerWidth;
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debug('get width', value);
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return value;
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},
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/**
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* Triggers the 'action' button
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* (used in Gaia integration testing).
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*
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* @public
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*/
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triggerAction: function() {
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if (this.action) { this.els.actionButton.click(); }
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},
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/**
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* Handle clicks on the action button.
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*
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* Fired pending to allow the 'click' event
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* to finish its event path before
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* dispatching the 'action' event.
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*
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* @param {Event} e
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* @private
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*/
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onActionButtonClick: function() {
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debug('action button click');
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var config = { detail: { type: this.action } };
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var e = new CustomEvent('action', config);
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setTimeout(() => this.dispatchEvent(e));
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},
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/**
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* Get the margin-start value required
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* to center the title between
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* surrounding buttons.
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*
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* @param {Object} title
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* @return {Object}
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* @private
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*/
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getTitleMarginStart: function() {
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var start = this.titleStart;
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var end = this.titleEnd;
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var marginStart = end - start;
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debug('get title margin start', marginStart);
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return marginStart;
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},
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/**
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* Get all the buttons (<a> & <button>)
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* before the first <h1>.
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*
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* @return {Array}
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* @private
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*/
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getButtonsBeforeTitle: function() {
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var children = this.children;
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var l = children.length;
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var els = [];
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for (var i = 0; i < l; i++) {
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var el = children[i];
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if (el.tagName === 'H1') { break; }
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if (!contributesToLayout(el)) { continue; }
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els.push(el);
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}
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// Don't forget the action button
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if (this.action) { els.push(this.els.actionButton); }
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return els;
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},
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/**
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* Get all the buttons (<a> & <button>)
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* after the last <h1>.
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*
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* @return {Array}
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* @private
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*/
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getButtonsAfterTitle: function() {
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var children = this.children;
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var els = [];
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for (var i = children.length - 1; i >= 0; i--) {
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var el = children[i];
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if (el.tagName === 'H1') { break; }
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if (!contributesToLayout(el)) { continue; }
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els.push(el);
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}
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return els;
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},
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/**
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* Get the sum of the width of
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* the given buttons.
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*
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* This function is optimized to avoid reading
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* `element.clientWidth` when possible.
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*
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* If a button is `display: none` it will
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* have a `.clientWidth` of 0, therefore won't
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* contribute anything to the overall sum.
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*
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* @param {Array} buttons
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* @return {Number}
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* @private
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*/
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sumButtonWidths: function(buttons) {
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var defaultWidth = 50;
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var sum = buttons.reduce((prev, button) => {
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var isStandardButton = button === this.els.actionButton;
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var width = isStandardButton ? defaultWidth : button.clientWidth;
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return prev + width;
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}, 0);
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debug('sum button widths', buttons, sum);
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return sum;
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},
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/**
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* Known attribute property
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* descriptors.
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*
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* These setters get called when matching
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* attributes change on the element.
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*
|
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* @type {Object}
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*/
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attrs: {
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action: {
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get: function() { return this._action; },
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set: function(value) {
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var action = KNOWN_ACTIONS[value];
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if (action === this._action) { return; }
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this.setAttr('action', action);
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|
this._action = action;
|
|
},
|
|
},
|
|
|
|
titleStart: {
|
|
get: function() {
|
|
debug('get title-start');
|
|
if ('_titleStart' in this) { return this._titleStart; }
|
|
var buttons = this.getButtonsBeforeTitle();
|
|
var value = this.sumButtonWidths(buttons);
|
|
debug('get title-start', buttons, value);
|
|
return value;
|
|
},
|
|
|
|
set: function(value) {
|
|
debug('set title-start', value);
|
|
value = parseInt(value, 10);
|
|
if (value === this._titleStart || isNaN(value)) { return; }
|
|
this.setAttr('title-start', value);
|
|
this._titleStart = value;
|
|
debug('set');
|
|
}
|
|
},
|
|
|
|
titleEnd: {
|
|
get: function() {
|
|
debug('get title-end');
|
|
if ('_titleEnd' in this) { return this._titleEnd; }
|
|
var buttons = this.getButtonsAfterTitle();
|
|
return this.sumButtonWidths(buttons);
|
|
},
|
|
|
|
set: function(value) {
|
|
debug('set title-end', value);
|
|
value = parseInt(value, 10);
|
|
if (value === this._titleEnd || isNaN(value)) { return; }
|
|
this.setAttr('title-end', value);
|
|
this._titleEnd = value;
|
|
}
|
|
},
|
|
|
|
noFontFit: {
|
|
get: function() { return this._noFontFit || false; },
|
|
set: function(value) {
|
|
debug('set no-font-fit', value);
|
|
value = !!(value || value === '');
|
|
|
|
if (value === this.noFontFit) { return; }
|
|
this._noFontFit = value;
|
|
|
|
if (value) { this.setAttr('no-font-fit', ''); }
|
|
else { this.removeAttr('no-font-fit'); }
|
|
}
|
|
}
|
|
},
|
|
|
|
template: `<div class="inner">
|
|
<button class="action-button">
|
|
<content select=".l10n-action"></content>
|
|
</button>
|
|
<content></content>
|
|
</div>
|
|
|
|
<style>
|
|
|
|
:host {
|
|
display: block;
|
|
-moz-user-select: none;
|
|
|
|
--gaia-header-button-color:
|
|
var(--header-button-color,
|
|
var(--header-color,
|
|
var(--link-color,
|
|
inherit)));
|
|
}
|
|
|
|
/**
|
|
* [hidden]
|
|
*/
|
|
|
|
:host[hidden] {
|
|
display: none;
|
|
}
|
|
|
|
/** Reset
|
|
---------------------------------------------------------*/
|
|
|
|
::-moz-focus-inner { border: 0; }
|
|
|
|
/** Inner
|
|
---------------------------------------------------------*/
|
|
|
|
.inner {
|
|
display: flex;
|
|
min-height: 50px;
|
|
direction: ltr;
|
|
-moz-user-select: none;
|
|
|
|
background:
|
|
var(--header-background,
|
|
var(--background,
|
|
#fff));
|
|
}
|
|
|
|
/** Action Button
|
|
---------------------------------------------------------*/
|
|
|
|
/**
|
|
* 1. Hidden by default
|
|
*/
|
|
|
|
.action-button {
|
|
position: relative;
|
|
|
|
display: none; /* 1 */
|
|
width: 50px;
|
|
font-size: 30px;
|
|
margin: 0;
|
|
padding: 0;
|
|
border: 0;
|
|
outline: 0;
|
|
|
|
align-items: center;
|
|
background: none;
|
|
cursor: pointer;
|
|
transition: opacity 200ms 280ms;
|
|
color:
|
|
var(--header-action-button-color,
|
|
var(--header-icon-color,
|
|
var(--gaia-header-button-color)));
|
|
}
|
|
|
|
/**
|
|
* [action=back]
|
|
* [action=menu]
|
|
* [action=close]
|
|
*
|
|
* 1. For icon vertical-alignment
|
|
*/
|
|
|
|
[action=back] .action-button,
|
|
[action=menu] .action-button,
|
|
[action=close] .action-button {
|
|
display: flex; /* 1 */
|
|
}
|
|
|
|
/**
|
|
* :active
|
|
*/
|
|
|
|
.action-button:active {
|
|
transition: none;
|
|
opacity: 0.2;
|
|
}
|
|
|
|
/** Action Button Icon
|
|
---------------------------------------------------------*/
|
|
|
|
.action-button:before {
|
|
font-family: 'gaia-icons';
|
|
font-style: normal;
|
|
text-rendering: optimizeLegibility;
|
|
font-weight: 500;
|
|
}
|
|
|
|
[action=close] .action-button:before { content: 'close' }
|
|
[action=back] .action-button:before { content: 'back' }
|
|
[action=menu] .action-button:before { content: 'menu' }
|
|
|
|
/** Action Button Icon
|
|
---------------------------------------------------------*/
|
|
|
|
/**
|
|
* 1. To enable vertical alignment.
|
|
*/
|
|
|
|
.action-button:before {
|
|
display: block;
|
|
}
|
|
|
|
/** Action Button Text
|
|
---------------------------------------------------------*/
|
|
|
|
/**
|
|
* To provide custom localized content for
|
|
* the action-button, we allow the user
|
|
* to provide an element with the class
|
|
* .l10n-action. This node is then
|
|
* pulled inside the real action-button.
|
|
*
|
|
* Example:
|
|
*
|
|
* <gaia-header action="back">
|
|
* <span class="l10n-action" aria-label="Back">Localized text</span>
|
|
* <h1>title</h1>
|
|
* </gaia-header>
|
|
*/
|
|
|
|
::content .l10n-action {
|
|
position: absolute;
|
|
left: 0;
|
|
top: 0;
|
|
width: 100%;
|
|
height: 100%;
|
|
font-size: 0;
|
|
}
|
|
|
|
/** Title
|
|
---------------------------------------------------------*/
|
|
|
|
/**
|
|
* 1. Vertically center text. We can't use flexbox
|
|
* here as it breaks text-overflow ellipsis
|
|
* without an inner div.
|
|
*/
|
|
|
|
::content h1 {
|
|
flex: 1;
|
|
margin: 0;
|
|
padding: 0;
|
|
overflow: hidden;
|
|
|
|
white-space: nowrap;
|
|
text-overflow: ellipsis;
|
|
text-align: center;
|
|
line-height: 50px; /* 1 */
|
|
font-weight: 300;
|
|
font-style: italic;
|
|
font-size: 24px;
|
|
|
|
color:
|
|
var(--header-title-color,
|
|
var(--header-color,
|
|
var(--title-color,
|
|
var(--text-color,
|
|
inherit))));
|
|
}
|
|
|
|
/**
|
|
* [dir=rtl]
|
|
*
|
|
* When the document is in RTL mode we still
|
|
* want the <h1> text to be reversed to that
|
|
* strings like '1 selected' become 'selected 1'.
|
|
*
|
|
* When we're happy for gaia-header to be fully
|
|
* RTL responsive we won't need this rule anymore,
|
|
* but this depends on all Gaia apps being ready.
|
|
*/
|
|
|
|
:host-context([dir=rtl]) ::content h1 {
|
|
direction: rtl;
|
|
}
|
|
|
|
/** Buttons
|
|
---------------------------------------------------------*/
|
|
|
|
::content a,
|
|
::content button {
|
|
position: relative;
|
|
z-index: 1;
|
|
box-sizing: border-box;
|
|
display: flex;
|
|
width: auto;
|
|
height: auto;
|
|
min-width: 50px;
|
|
margin: 0;
|
|
padding: 0 10px;
|
|
outline: 0;
|
|
border: 0;
|
|
|
|
font-size: 14px;
|
|
line-height: 1;
|
|
align-items: center;
|
|
justify-content: center;
|
|
text-decoration: none;
|
|
text-align: center;
|
|
background: none;
|
|
border-radius: 0;
|
|
font-style: italic;
|
|
cursor: pointer;
|
|
transition: opacity 200ms 280ms;
|
|
color: var(--gaia-header-button-color);
|
|
}
|
|
|
|
/**
|
|
* :active
|
|
*/
|
|
|
|
::content a:active,
|
|
::content button:active {
|
|
transition: none;
|
|
opacity: 0.2;
|
|
}
|
|
|
|
/**
|
|
* [hidden]
|
|
*/
|
|
|
|
::content a[hidden],
|
|
::content button[hidden] {
|
|
display: none;
|
|
}
|
|
|
|
/**
|
|
* [disabled]
|
|
*/
|
|
|
|
::content a[disabled],
|
|
::content button[disabled] {
|
|
pointer-events: none;
|
|
color: var(--header-disabled-button-color);
|
|
}
|
|
|
|
/** Icon Buttons
|
|
---------------------------------------------------------*/
|
|
|
|
/**
|
|
* Icons are a different color to text
|
|
*/
|
|
|
|
::content .icon,
|
|
::content [data-icon] {
|
|
color:
|
|
var(--header-icon-color,
|
|
var(--gaia-header-button-color));
|
|
}
|
|
|
|
/**
|
|
* If users want their action button
|
|
* to be in the component's light-dom
|
|
* they can add an .action class
|
|
* to make it look like the
|
|
* shadow action button.
|
|
*/
|
|
|
|
::content .action {
|
|
color:
|
|
var(--header-action-button-color,
|
|
var(--header-icon-color,
|
|
var(--gaia-header-button-color)));
|
|
}
|
|
|
|
/**
|
|
* [data-icon]:empty
|
|
*
|
|
* Icon buttons with no textContent,
|
|
* should always be 50px.
|
|
*
|
|
* This is to prevent buttons being
|
|
* larger than they should be before
|
|
* icon-font has loaded.
|
|
*/
|
|
|
|
::content [data-icon]:empty {
|
|
width: 50px;
|
|
}
|
|
|
|
</style>`,
|
|
|
|
// Test hook
|
|
nextTick: nextTick
|
|
});
|
|
|
|
/**
|
|
* Utils
|
|
*/
|
|
|
|
/**
|
|
* Determines whether passed element
|
|
* contributes to the layout in gaia-header.
|
|
*
|
|
* @param {Element} el
|
|
* @return {Boolean}
|
|
*/
|
|
function contributesToLayout(el) { return el.tagName !== 'STYLE'; }
|
|
|
|
/**
|
|
* Set a 'style id' property that
|
|
* can be retrieved later.
|
|
*
|
|
* Used to determine whether a title's
|
|
* `style` needs to be updated or not.
|
|
*
|
|
* @param {Element} el
|
|
* @param {String} id
|
|
*/
|
|
function setStyleId(el, id) { el._styleId = id; }
|
|
|
|
/**
|
|
* Get a 'style id' property.
|
|
*
|
|
* Used to determine whether a title's
|
|
* `style` needs to be updated or not.
|
|
*
|
|
* @param {Element} el
|
|
* @param {String} id
|
|
*/
|
|
function getStyleId(el) { return el._styleId; }
|
|
|
|
/**
|
|
* Calls callback at next 'microtask'.
|
|
* Returns an object that has
|
|
* a `.clear()` method.
|
|
*
|
|
* @param {Function} fn
|
|
* @return {Object} { clear }
|
|
*/
|
|
function nextTick(fn) {
|
|
var cleared;
|
|
Promise.resolve().then(() => { if (!cleared) { fn(); } });
|
|
return { clear: function() { cleared = true; }};
|
|
}
|
|
|
|
});})(typeof define=='function'&&define.amd?define
|
|
:(function(n,w){'use strict';return typeof module=='object'?function(c){
|
|
c(require,exports,module);}:function(c){var m={exports:{}};c(function(n){
|
|
return w[n];},m.exports,m);w[n]=m.exports;};})('gaia-header',this));
|