core/css.js

/**
 * @license
 * Copyright 2013 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * @fileoverview Inject Blockly's CSS synchronously.
 */
'use strict';

/**
 * Inject Blockly's CSS synchronously.
 * @namespace Blockly.Css
 */
goog.module('Blockly.Css');

const deprecation = goog.require('Blockly.utils.deprecation');


/**
 * Has CSS already been injected?
 * @type {boolean}
 * @private
 */
let injected = false;

/**
 * Add some CSS to the blob that will be injected later.  Allows optional
 * components such as fields and the toolbox to store separate CSS.
 * @param {string|!Array<string>} cssContent Multiline CSS string or an array of
 *    single lines of CSS.
 * @alias Blockly.Css.register
 */
const register = function(cssContent) {
  if (injected) {
    throw Error('CSS already injected');
  }

  if (Array.isArray(cssContent)) {
    deprecation.warn(
        'Registering CSS by passing an array of strings', 'September 2021',
        'September 2022', 'css.register passing a multiline string');
    content += ('\n' + cssContent.join('\n'));
  } else {
    // Add new cssContent in the global content.
    content += ('\n' + cssContent);
  }
};
exports.register = register;

/**
 * Inject the CSS into the DOM.  This is preferable over using a regular CSS
 * file since:
 * a) It loads synchronously and doesn't force a redraw later.
 * b) It speeds up loading by not blocking on a separate HTTP transfer.
 * c) The CSS content may be made dynamic depending on init options.
 * @param {boolean} hasCss If false, don't inject CSS
 *     (providing CSS becomes the document's responsibility).
 * @param {string} pathToMedia Path from page to the Blockly media directory.
 * @alias Blockly.Css.inject
 */
const inject = function(hasCss, pathToMedia) {
  // Only inject the CSS once.
  if (injected) {
    return;
  }
  injected = true;
  if (!hasCss) {
    return;
  }
  // Strip off any trailing slash (either Unix or Windows).
  const mediaPath = pathToMedia.replace(/[\\/]$/, '');
  const cssContent = content.replace(/<<<PATH>>>/g, mediaPath);
  // Cleanup the collected css content after injecting it to the DOM.
  content = '';

  // Inject CSS tag at start of head.
  const cssNode = document.createElement('style');
  cssNode.id = 'blockly-common-style';
  const cssTextNode = document.createTextNode(cssContent);
  cssNode.appendChild(cssTextNode);
  document.head.insertBefore(cssNode, document.head.firstChild);
};
exports.inject = inject;

/**
 * The CSS content for Blockly.
 * @alias Blockly.Css.content
 */
let content = (`
  .blocklySvg {
    background-color: #fff;
    outline: none;
    overflow: hidden;  /* IE overflows by default. */
    position: absolute;
    display: block;
  }

  .blocklyWidgetDiv {
    display: none;
    position: absolute;
    z-index: 99999;  /* big value for bootstrap3 compatibility */
  }

  .injectionDiv {
    height: 100%;
    position: relative;
    overflow: hidden;  /* So blocks in drag surface disappear at edges */
    touch-action: none;
  }

  .blocklyNonSelectable {
    user-select: none;
    -ms-user-select: none;
    -webkit-user-select: none;
  }

  .blocklyWsDragSurface {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
  }

  /* Added as a separate rule with multiple classes to make it more specific
     than a bootstrap rule that selects svg:root. See issue #1275 for context.
  */
  .blocklyWsDragSurface.blocklyOverflowVisible {
    overflow: visible;
  }

  .blocklyBlockDragSurface {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: visible !important;
    z-index: 50;  /* Display below toolbox, but above everything else. */
  }

  .blocklyBlockCanvas.blocklyCanvasTransitioning,
  .blocklyBubbleCanvas.blocklyCanvasTransitioning {
    transition: transform .5s;
  }

  .blocklyTooltipDiv {
    background-color: #ffffc7;
    border: 1px solid #ddc;
    box-shadow: 4px 4px 20px 1px rgba(0,0,0,.15);
    color: #000;
    display: none;
    font: 9pt sans-serif;
    opacity: .9;
    padding: 2px;
    position: absolute;
    z-index: 100000;  /* big value for bootstrap3 compatibility */
  }

  .blocklyDropDownDiv {
    position: absolute;
    left: 0;
    top: 0;
    z-index: 1000;
    display: none;
    border: 1px solid;
    border-color: #dadce0;
    background-color: #fff;
    border-radius: 2px;
    padding: 4px;
    box-shadow: 0 0 3px 1px rgba(0,0,0,.3);
  }

  .blocklyDropDownDiv.blocklyFocused {
    box-shadow: 0 0 6px 1px rgba(0,0,0,.3);
  }

  .blocklyDropDownContent {
    max-height: 300px;  // @todo: spec for maximum height.
    overflow: auto;
    overflow-x: hidden;
    position: relative;
  }

  .blocklyDropDownArrow {
    position: absolute;
    left: 0;
    top: 0;
    width: 16px;
    height: 16px;
    z-index: -1;
    background-color: inherit;
    border-color: inherit;
  }

  .blocklyDropDownButton {
    display: inline-block;
    float: left;
    padding: 0;
    margin: 4px;
    border-radius: 4px;
    outline: none;
    border: 1px solid;
    transition: box-shadow .1s;
    cursor: pointer;
  }

  .blocklyArrowTop {
    border-top: 1px solid;
    border-left: 1px solid;
    border-top-left-radius: 4px;
    border-color: inherit;
  }

  .blocklyArrowBottom {
    border-bottom: 1px solid;
    border-right: 1px solid;
    border-bottom-right-radius: 4px;
    border-color: inherit;
  }

  .blocklyResizeSE {
    cursor: se-resize;
    fill: #aaa;
  }

  .blocklyResizeSW {
    cursor: sw-resize;
    fill: #aaa;
  }

  .blocklyResizeLine {
    stroke: #515A5A;
    stroke-width: 1;
  }

  .blocklyHighlightedConnectionPath {
    fill: none;
    stroke: #fc3;
    stroke-width: 4px;
  }

  .blocklyPathLight {
    fill: none;
    stroke-linecap: round;
    stroke-width: 1;
  }

  .blocklySelected>.blocklyPathLight {
    display: none;
  }

  .blocklyDraggable {
    /* backup for browsers (e.g. IE11) that don't support grab */
    cursor: url("<<<PATH>>>/handopen.cur"), auto;
    cursor: grab;
    cursor: -webkit-grab;
  }

    /* backup for browsers (e.g. IE11) that don't support grabbing */
  .blocklyDragging {
    /* backup for browsers (e.g. IE11) that don't support grabbing */
    cursor: url("<<<PATH>>>/handclosed.cur"), auto;
    cursor: grabbing;
    cursor: -webkit-grabbing;
  }

    /* Changes cursor on mouse down. Not effective in Firefox because of
       https://bugzilla.mozilla.org/show_bug.cgi?id=771241 */
  .blocklyDraggable:active {
    /* backup for browsers (e.g. IE11) that don't support grabbing */
    cursor: url("<<<PATH>>>/handclosed.cur"), auto;
    cursor: grabbing;
    cursor: -webkit-grabbing;
  }

  /* Change the cursor on the whole drag surface in case the mouse gets
     ahead of block during a drag. This way the cursor is still a closed hand.
    */
  .blocklyBlockDragSurface .blocklyDraggable {
    /* backup for browsers (e.g. IE11) that don't support grabbing */
    cursor: url("<<<PATH>>>/handclosed.cur"), auto;
    cursor: grabbing;
    cursor: -webkit-grabbing;
  }

  .blocklyDragging.blocklyDraggingDelete {
    cursor: url("<<<PATH>>>/handdelete.cur"), auto;
  }

  .blocklyDragging>.blocklyPath,
  .blocklyDragging>.blocklyPathLight {
    fill-opacity: .8;
    stroke-opacity: .8;
  }

  .blocklyDragging>.blocklyPathDark {
    display: none;
  }

  .blocklyDisabled>.blocklyPath {
    fill-opacity: .5;
    stroke-opacity: .5;
  }

  .blocklyDisabled>.blocklyPathLight,
  .blocklyDisabled>.blocklyPathDark {
    display: none;
  }

  .blocklyInsertionMarker>.blocklyPath,
  .blocklyInsertionMarker>.blocklyPathLight,
  .blocklyInsertionMarker>.blocklyPathDark {
    fill-opacity: .2;
    stroke: none;
  }

  .blocklyMultilineText {
    font-family: monospace;
  }

  .blocklyNonEditableText>text {
    pointer-events: none;
  }

  .blocklyFlyout {
    position: absolute;
    z-index: 20;
  }

  .blocklyText text {
    cursor: default;
  }

  /*
    Don't allow users to select text.  It gets annoying when trying to
    drag a block and selected text moves instead.
  */
  .blocklySvg text,
  .blocklyBlockDragSurface text {
    user-select: none;
    -ms-user-select: none;
    -webkit-user-select: none;
    cursor: inherit;
  }

  .blocklyHidden {
    display: none;
  }

  .blocklyFieldDropdown:not(.blocklyHidden) {
    display: block;
  }

  .blocklyIconGroup {
    cursor: default;
  }

  .blocklyIconGroup:not(:hover),
  .blocklyIconGroupReadonly {
    opacity: .6;
  }

  .blocklyIconShape {
    fill: #00f;
    stroke: #fff;
    stroke-width: 1px;
  }

  .blocklyIconSymbol {
    fill: #fff;
  }

  .blocklyMinimalBody {
    margin: 0;
    padding: 0;
  }

  .blocklyHtmlInput {
    border: none;
    border-radius: 4px;
    height: 100%;
    margin: 0;
    outline: none;
    padding: 0;
    width: 100%;
    text-align: center;
    display: block;
    box-sizing: border-box;
  }

  /* Edge and IE introduce a close icon when the input value is longer than a
     certain length. This affects our sizing calculations of the text input.
     Hiding the close icon to avoid that. */
  .blocklyHtmlInput::-ms-clear {
    display: none;
  }

  .blocklyMainBackground {
    stroke-width: 1;
    stroke: #c6c6c6;  /* Equates to #ddd due to border being off-pixel. */
  }

  .blocklyMutatorBackground {
    fill: #fff;
    stroke: #ddd;
    stroke-width: 1;
  }

  .blocklyFlyoutBackground {
    fill: #ddd;
    fill-opacity: .8;
  }

  .blocklyMainWorkspaceScrollbar {
    z-index: 20;
  }

  .blocklyFlyoutScrollbar {
    z-index: 30;
  }

  .blocklyScrollbarHorizontal,
  .blocklyScrollbarVertical {
    position: absolute;
    outline: none;
  }

  .blocklyScrollbarBackground {
    opacity: 0;
  }

  .blocklyScrollbarHandle {
    fill: #ccc;
  }

  .blocklyScrollbarBackground:hover+.blocklyScrollbarHandle,
  .blocklyScrollbarHandle:hover {
    fill: #bbb;
  }

  /* Darken flyout scrollbars due to being on a grey background. */
  /* By contrast, workspace scrollbars are on a white background. */
  .blocklyFlyout .blocklyScrollbarHandle {
    fill: #bbb;
  }

  .blocklyFlyout .blocklyScrollbarBackground:hover+.blocklyScrollbarHandle,
  .blocklyFlyout .blocklyScrollbarHandle:hover {
    fill: #aaa;
  }

  .blocklyInvalidInput {
    background: #faa;
  }

  .blocklyVerticalMarker {
    stroke-width: 3px;
    fill: rgba(255,255,255,.5);
    pointer-events: none;
  }

  .blocklyComputeCanvas {
    position: absolute;
    width: 0;
    height: 0;
  }

  .blocklyNoPointerEvents {
    pointer-events: none;
  }

  .blocklyContextMenu {
    border-radius: 4px;
    max-height: 100%;
  }

  .blocklyDropdownMenu {
    border-radius: 2px;
    padding: 0 !important;
  }

  .blocklyDropdownMenu .blocklyMenuItem {
    /* 28px on the left for icon or checkbox. */
    padding-left: 28px;
  }

  /* BiDi override for the resting state. */
  .blocklyDropdownMenu .blocklyMenuItemRtl {
    /* Flip left/right padding for BiDi. */
    padding-left: 5px;
    padding-right: 28px;
  }

  .blocklyWidgetDiv .blocklyMenu {
    background: #fff;
    border: 1px solid transparent;
    box-shadow: 0 0 3px 1px rgba(0,0,0,.3);
    font: normal 13px Arial, sans-serif;
    margin: 0;
    outline: none;
    padding: 4px 0;
    position: absolute;
    overflow-y: auto;
    overflow-x: hidden;
    max-height: 100%;
    z-index: 20000;  /* Arbitrary, but some apps depend on it... */
  }

  .blocklyWidgetDiv .blocklyMenu.blocklyFocused {
    box-shadow: 0 0 6px 1px rgba(0,0,0,.3);
  }

  .blocklyDropDownDiv .blocklyMenu {
    background: inherit;  /* Compatibility with gapi, reset from goog-menu */
    border: inherit;  /* Compatibility with gapi, reset from goog-menu */
    font: normal 13px "Helvetica Neue", Helvetica, sans-serif;
    outline: none;
    position: relative;  /* Compatibility with gapi, reset from goog-menu */
    z-index: 20000;  /* Arbitrary, but some apps depend on it... */
  }

  /* State: resting. */
  .blocklyMenuItem {
    border: none;
    color: #000;
    cursor: pointer;
    list-style: none;
    margin: 0;
    /* 7em on the right for shortcut. */
    min-width: 7em;
    padding: 6px 15px;
    white-space: nowrap;
  }

  /* State: disabled. */
  .blocklyMenuItemDisabled {
    color: #ccc;
    cursor: inherit;
  }

  /* State: hover. */
  .blocklyMenuItemHighlight {
    background-color: rgba(0,0,0,.1);
  }

  /* State: selected/checked. */
  .blocklyMenuItemCheckbox {
    height: 16px;
    position: absolute;
    width: 16px;
  }

  .blocklyMenuItemSelected .blocklyMenuItemCheckbox {
    background: url(<<<PATH>>>/sprites.png) no-repeat -48px -16px;
    float: left;
    margin-left: -24px;
    position: static;  /* Scroll with the menu. */
  }

  .blocklyMenuItemRtl .blocklyMenuItemCheckbox {
    float: right;
    margin-right: -24px;
  }
`);
exports.content = content;