@angular/flex-layout
Version:
Angular Flex-Layout =======
129 lines • 16.9 kB
JavaScript
import { DOCUMENT } from '@angular/common';
import { BEFORE_APP_SERIALIZED } from '@angular/platform-server';
import { BREAKPOINTS, CLASS_NAME, SERVER_TOKEN, ɵMatchMedia as MatchMedia, StylesheetMap, sortAscendingPriority } from '@angular/flex-layout/core';
import { ServerMatchMedia } from './server-match-media';
/**
* Activate all of the registered breakpoints in sequence, and then
* retrieve the associated stylings from the virtual stylesheet
* @param serverSheet the virtual stylesheet that stores styles for each
* element
* @param mediaController the MatchMedia service to activate/deactivate breakpoints
* @param breakpoints the registered breakpoints to activate/deactivate
* @param layoutConfig the library config, and specifically the breakpoints to activate
*/
export function generateStaticFlexLayoutStyles(serverSheet, mediaController, breakpoints) {
// Store the custom classes in the following map, that way only
// one class gets allocated per HTMLElement, and each class can
// be referenced in the static media queries
const classMap = new Map();
// Get the initial stylings for all of the directives,
// and initialize the fallback block of stylings
const defaultStyles = new Map(serverSheet.stylesheet);
// Reset the class counter, otherwise class numbers will
// increase with each server render
nextId = 0;
let styleText = generateCss(defaultStyles, 'all', classMap);
[...breakpoints].sort(sortAscendingPriority).forEach((bp, i) => {
serverSheet.clearStyles();
mediaController.activateBreakpoint(bp);
const stylesheet = new Map(serverSheet.stylesheet);
if (stylesheet.size > 0) {
styleText += generateCss(stylesheet, bp.mediaQuery, classMap);
}
mediaController.deactivateBreakpoint(breakpoints[i]);
});
return styleText;
}
/**
* Create a style tag populated with the dynamic stylings from Flex
* components and attach it to the head of the DOM
*/
export function FLEX_SSR_SERIALIZER_FACTORY(serverSheet, mediaController, _document, breakpoints) {
return () => {
// This is the style tag that gets inserted into the head of the DOM,
// populated with the manual media queries
const styleTag = _document.createElement('style');
const styleText = generateStaticFlexLayoutStyles(serverSheet, mediaController, breakpoints);
styleTag.classList.add(`${CLASS_NAME}ssr`);
styleTag.textContent = styleText;
_document.head.appendChild(styleTag);
};
}
/**
* Provider to set static styles on the server
*/
export const SERVER_PROVIDERS = [
{
provide: BEFORE_APP_SERIALIZED,
useFactory: FLEX_SSR_SERIALIZER_FACTORY,
deps: [
StylesheetMap,
MatchMedia,
DOCUMENT,
BREAKPOINTS
],
multi: true
},
{
provide: SERVER_TOKEN,
useValue: true
},
{
provide: MatchMedia,
useClass: ServerMatchMedia
}
];
let nextId = 0;
const IS_DEBUG_MODE = false;
/**
* create @media queries based on a virtual stylesheet
* * Adds a unique class to each element and stores it
* in a shared classMap for later reuse
* @param stylesheet the virtual stylesheet that stores styles for each
* element
* @param mediaQuery the given @media CSS selector for the current breakpoint
* @param classMap the map of HTML elements to class names to avoid duplications
*/
function generateCss(stylesheet, mediaQuery, classMap) {
let css = '';
stylesheet.forEach((styles, el) => {
let keyVals = '';
let className = getClassName(el, classMap);
styles.forEach((v, k) => {
keyVals += v ? format(`${k}:${v};`) : '';
});
// Build list of CSS styles; each with a className
css += format(`.${className} {`, keyVals, '}');
});
// Group 1 or more styles (each with className) in a specific mediaQuery
return format(`@media ${mediaQuery} {`, css, '}');
}
/**
* For debugging purposes, prefix css segment with linefeed(s) for easy
* debugging purposes.
*/
function format(...list) {
let result = '';
list.forEach((css, i) => {
result += IS_DEBUG_MODE ? formatSegment(css, i !== 0) : css;
});
return result;
}
function formatSegment(css, asPrefix = true) {
return asPrefix ? `\n${css}` : `${css}\n`;
}
/**
* Get className associated with CSS styling
* If not found, generate global className and set
* association.
*/
function getClassName(element, classMap) {
let className = classMap.get(element);
if (!className) {
className = `${CLASS_NAME}${nextId++}`;
classMap.set(element, className);
}
element.classList.add(className);
return className;
}
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* @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 */\nimport {InjectionToken} from '@angular/core';\nimport {DOCUMENT} from '@angular/common';\nimport {BEFORE_APP_SERIALIZED} from '@angular/platform-server';\nimport {\n  BREAKPOINTS,\n  CLASS_NAME,\n  SERVER_TOKEN,\n  BreakPoint,\n  ɵMatchMedia as MatchMedia,\n  StylesheetMap,\n  sortAscendingPriority\n} from '@angular/flex-layout/core';\n\nimport {ServerMatchMedia} from './server-match-media';\n\n/**\n * Activate all of the registered breakpoints in sequence, and then\n * retrieve the associated stylings from the virtual stylesheet\n * @param serverSheet the virtual stylesheet that stores styles for each\n *        element\n * @param mediaController the MatchMedia service to activate/deactivate breakpoints\n * @param breakpoints the registered breakpoints to activate/deactivate\n * @param layoutConfig the library config, and specifically the breakpoints to activate\n */\nexport function generateStaticFlexLayoutStyles(serverSheet: StylesheetMap,\n                                               mediaController: ServerMatchMedia,\n                                               breakpoints: BreakPoint[]) {\n  // Store the custom classes in the following map, that way only\n  // one class gets allocated per HTMLElement, and each class can\n  // be referenced in the static media queries\n  const classMap = new Map<HTMLElement, string>();\n\n  // Get the initial stylings for all of the directives,\n  // and initialize the fallback block of stylings\n  const defaultStyles = new Map(serverSheet.stylesheet);\n  // Reset the class counter, otherwise class numbers will\n  // increase with each server render\n  nextId = 0;\n  let styleText = generateCss(defaultStyles, 'all', classMap);\n\n  [...breakpoints].sort(sortAscendingPriority).forEach((bp, i) => {\n    serverSheet.clearStyles();\n    mediaController.activateBreakpoint(bp);\n    const stylesheet = new Map(serverSheet.stylesheet);\n    if (stylesheet.size > 0) {\n      styleText += generateCss(stylesheet, bp.mediaQuery, classMap);\n    }\n    mediaController.deactivateBreakpoint(breakpoints[i]);\n  });\n\n\n\n  return styleText;\n}\n\n/**\n * Create a style tag populated with the dynamic stylings from Flex\n * components and attach it to the head of the DOM\n */\nexport function FLEX_SSR_SERIALIZER_FACTORY(serverSheet: StylesheetMap,\n                                            mediaController: ServerMatchMedia,\n                                            _document: Document,\n                                            breakpoints: BreakPoint[]) {\n  return () => {\n    // This is the style tag that gets inserted into the head of the DOM,\n    // populated with the manual media queries\n    const styleTag = _document.createElement('style');\n    const styleText = generateStaticFlexLayoutStyles(serverSheet, mediaController, breakpoints);\n    styleTag.classList.add(`${CLASS_NAME}ssr`);\n    styleTag.textContent = styleText;\n    _document.head!.appendChild(styleTag);\n  };\n}\n\n/**\n *  Provider to set static styles on the server\n */\nexport const SERVER_PROVIDERS = [\n  {\n    provide: <InjectionToken<() => void>>BEFORE_APP_SERIALIZED,\n    useFactory: FLEX_SSR_SERIALIZER_FACTORY,\n    deps: [\n      StylesheetMap,\n      MatchMedia,\n      DOCUMENT,\n      BREAKPOINTS\n    ],\n    multi: true\n  },\n  {\n    provide: SERVER_TOKEN,\n    useValue: true\n  },\n  {\n    provide: MatchMedia,\n    useClass: ServerMatchMedia\n  }\n];\n\n\nlet nextId = 0;\nconst IS_DEBUG_MODE = false;\n\nexport type StyleSheet = Map<HTMLElement, Map<string, string|number>>;\nexport type ClassMap = Map<HTMLElement, string>;\n\n/**\n * create @media queries based on a virtual stylesheet\n * * Adds a unique class to each element and stores it\n *   in a shared classMap for later reuse\n * @param stylesheet the virtual stylesheet that stores styles for each\n *        element\n * @param mediaQuery the given @media CSS selector for the current breakpoint\n * @param classMap the map of HTML elements to class names to avoid duplications\n */\nfunction generateCss(stylesheet: StyleSheet, mediaQuery: string, classMap: ClassMap) {\n  let css = '';\n  stylesheet.forEach((styles, el) => {\n    let keyVals = '';\n    let className = getClassName(el, classMap);\n\n    styles.forEach((v, k) => {\n      keyVals += v ? format(`${k}:${v};`) : '';\n    });\n\n    // Build list of CSS styles; each with a className\n    css += format(`.${className} {`, keyVals, '}');\n  });\n\n  // Group 1 or more styles (each with className) in a specific mediaQuery\n  return format(`@media ${mediaQuery} {`, css, '}');\n}\n\n/**\n * For debugging purposes, prefix css segment with linefeed(s) for easy\n  * debugging purposes.\n */\nfunction format(...list: string[]): string {\n  let result = '';\n  list.forEach((css, i) => {\n    result += IS_DEBUG_MODE ? formatSegment(css, i !== 0) : css;\n  });\n  return result;\n}\n\nfunction formatSegment(css: string, asPrefix: boolean = true): string {\n  return asPrefix ? `\\n${css}` : `${css}\\n`;\n}\n\n/**\n * Get className associated with CSS styling\n * If not found, generate global className and set\n * association.\n */\nfunction getClassName(element: HTMLElement, classMap: Map<HTMLElement, string>) {\n  let className = classMap.get(element);\n  if (!className) {\n    className = `${CLASS_NAME}${nextId++}`;\n    classMap.set(element, className);\n  }\n  element.classList.add(className);\n\n  return className;\n}\n"]}