388 lines
9.6 KiB
JavaScript
388 lines
9.6 KiB
JavaScript
import { enterFullscreen } from '../utils/util.js'
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/**
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* Handles all reveal.js keyboard interactions.
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*/
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export default class Keyboard {
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constructor( Reveal ) {
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this.Reveal = Reveal;
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// A key:value map of keyboard keys and descriptions of
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// the actions they trigger
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this.shortcuts = {};
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// Holds custom key code mappings
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this.bindings = {};
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this.onDocumentKeyDown = this.onDocumentKeyDown.bind( this );
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this.onDocumentKeyPress = this.onDocumentKeyPress.bind( this );
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}
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/**
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* Called when the reveal.js config is updated.
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*/
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configure( config, oldConfig ) {
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if( config.navigationMode === 'linear' ) {
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this.shortcuts['→ , ↓ , SPACE , N , L , J'] = 'Next slide';
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this.shortcuts['← , ↑ , P , H , K'] = 'Previous slide';
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}
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else {
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this.shortcuts['N , SPACE'] = 'Next slide';
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this.shortcuts['P'] = 'Previous slide';
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this.shortcuts['← , H'] = 'Navigate left';
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this.shortcuts['→ , L'] = 'Navigate right';
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this.shortcuts['↑ , K'] = 'Navigate up';
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this.shortcuts['↓ , J'] = 'Navigate down';
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}
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this.shortcuts['Home , Shift ←'] = 'First slide';
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this.shortcuts['End , Shift →'] = 'Last slide';
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this.shortcuts['B , .'] = 'Pause';
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this.shortcuts['F'] = 'Fullscreen';
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this.shortcuts['ESC, O'] = 'Slide overview';
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}
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/**
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* Starts listening for keyboard events.
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*/
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bind() {
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document.addEventListener( 'keydown', this.onDocumentKeyDown, false );
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document.addEventListener( 'keypress', this.onDocumentKeyPress, false );
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}
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/**
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* Stops listening for keyboard events.
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*/
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unbind() {
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document.removeEventListener( 'keydown', this.onDocumentKeyDown, false );
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document.removeEventListener( 'keypress', this.onDocumentKeyPress, false );
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}
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/**
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* Add a custom key binding with optional description to
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* be added to the help screen.
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*/
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addKeyBinding( binding, callback ) {
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if( typeof binding === 'object' && binding.keyCode ) {
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this.bindings[binding.keyCode] = {
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callback: callback,
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key: binding.key,
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description: binding.description
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};
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}
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else {
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this.bindings[binding] = {
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callback: callback,
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key: null,
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description: null
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};
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}
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}
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/**
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* Removes the specified custom key binding.
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*/
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removeKeyBinding( keyCode ) {
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delete this.bindings[keyCode];
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}
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/**
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* Programmatically triggers a keyboard event
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*
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* @param {int} keyCode
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*/
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triggerKey( keyCode ) {
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this.onDocumentKeyDown( { keyCode } );
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}
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/**
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* Registers a new shortcut to include in the help overlay
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*
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* @param {String} key
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* @param {String} value
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*/
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registerKeyboardShortcut( key, value ) {
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this.shortcuts[key] = value;
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}
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getShortcuts() {
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return this.shortcuts;
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}
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getBindings() {
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return this.bindings;
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}
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/**
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* Handler for the document level 'keypress' event.
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*
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* @param {object} event
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*/
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onDocumentKeyPress( event ) {
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// Check if the pressed key is question mark
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if( event.shiftKey && event.charCode === 63 ) {
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this.Reveal.toggleHelp();
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}
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}
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/**
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* Handler for the document level 'keydown' event.
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*
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* @param {object} event
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*/
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onDocumentKeyDown( event ) {
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let config = this.Reveal.getConfig();
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// If there's a condition specified and it returns false,
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// ignore this event
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if( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) {
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return true;
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}
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// If keyboardCondition is set, only capture keyboard events
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// for embedded decks when they are focused
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if( config.keyboardCondition === 'focused' && !this.Reveal.isFocused() ) {
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return true;
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}
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// Shorthand
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let keyCode = event.keyCode;
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// Remember if auto-sliding was paused so we can toggle it
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let autoSlideWasPaused = !this.Reveal.isAutoSliding();
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this.Reveal.onUserInput( event );
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// Is there a focused element that could be using the keyboard?
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let activeElementIsCE = document.activeElement && document.activeElement.isContentEditable === true;
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let activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
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let activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);
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// Whitelist specific modified + keycode combinations
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let prevSlideShortcut = event.shiftKey && event.keyCode === 32;
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let firstSlideShortcut = event.shiftKey && keyCode === 37;
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let lastSlideShortcut = event.shiftKey && keyCode === 39;
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// Prevent all other events when a modifier is pressed
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let unusedModifier = !prevSlideShortcut && !firstSlideShortcut && !lastSlideShortcut &&
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( event.shiftKey || event.altKey || event.ctrlKey || event.metaKey );
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// Disregard the event if there's a focused element or a
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// keyboard modifier key is present
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if( activeElementIsCE || activeElementIsInput || activeElementIsNotes || unusedModifier ) return;
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// While paused only allow resume keyboard events; 'b', 'v', '.'
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let resumeKeyCodes = [66,86,190,191];
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let key;
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// Custom key bindings for togglePause should be able to resume
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if( typeof config.keyboard === 'object' ) {
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for( key in config.keyboard ) {
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if( config.keyboard[key] === 'togglePause' ) {
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resumeKeyCodes.push( parseInt( key, 10 ) );
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}
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}
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}
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if( this.Reveal.isPaused() && resumeKeyCodes.indexOf( keyCode ) === -1 ) {
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return false;
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}
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// Use linear navigation if we're configured to OR if
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// the presentation is one-dimensional
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let useLinearMode = config.navigationMode === 'linear' || !this.Reveal.hasHorizontalSlides() || !this.Reveal.hasVerticalSlides();
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let triggered = false;
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// 1. User defined key bindings
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if( typeof config.keyboard === 'object' ) {
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for( key in config.keyboard ) {
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// Check if this binding matches the pressed key
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if( parseInt( key, 10 ) === keyCode ) {
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let value = config.keyboard[ key ];
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// Callback function
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if( typeof value === 'function' ) {
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value.apply( null, [ event ] );
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}
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// String shortcuts to reveal.js API
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else if( typeof value === 'string' && typeof this.Reveal[ value ] === 'function' ) {
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this.Reveal[ value ].call();
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}
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triggered = true;
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}
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}
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}
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// 2. Registered custom key bindings
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if( triggered === false ) {
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for( key in this.bindings ) {
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// Check if this binding matches the pressed key
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if( parseInt( key, 10 ) === keyCode ) {
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let action = this.bindings[ key ].callback;
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// Callback function
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if( typeof action === 'function' ) {
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action.apply( null, [ event ] );
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}
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// String shortcuts to reveal.js API
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else if( typeof action === 'string' && typeof this.Reveal[ action ] === 'function' ) {
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this.Reveal[ action ].call();
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}
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triggered = true;
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}
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}
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}
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// 3. System defined key bindings
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if( triggered === false ) {
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// Assume true and try to prove false
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triggered = true;
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// P, PAGE UP
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if( keyCode === 80 || keyCode === 33 ) {
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this.Reveal.prev();
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}
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// N, PAGE DOWN
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else if( keyCode === 78 || keyCode === 34 ) {
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this.Reveal.next();
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}
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// H, LEFT
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else if( keyCode === 72 || keyCode === 37 ) {
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if( firstSlideShortcut ) {
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this.Reveal.slide( 0 );
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}
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else if( !this.Reveal.overview.isActive() && useLinearMode ) {
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this.Reveal.prev();
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}
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else {
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this.Reveal.left();
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}
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}
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// L, RIGHT
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else if( keyCode === 76 || keyCode === 39 ) {
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if( lastSlideShortcut ) {
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this.Reveal.slide( Number.MAX_VALUE );
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}
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else if( !this.Reveal.overview.isActive() && useLinearMode ) {
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this.Reveal.next();
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}
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else {
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this.Reveal.right();
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}
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}
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// K, UP
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else if( keyCode === 75 || keyCode === 38 ) {
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if( !this.Reveal.overview.isActive() && useLinearMode ) {
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this.Reveal.prev();
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}
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else {
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this.Reveal.up();
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}
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}
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// J, DOWN
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else if( keyCode === 74 || keyCode === 40 ) {
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if( !this.Reveal.overview.isActive() && useLinearMode ) {
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this.Reveal.next();
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}
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else {
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this.Reveal.down();
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}
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}
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// HOME
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else if( keyCode === 36 ) {
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this.Reveal.slide( 0 );
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}
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// END
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else if( keyCode === 35 ) {
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this.Reveal.slide( Number.MAX_VALUE );
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}
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// SPACE
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else if( keyCode === 32 ) {
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if( this.Reveal.overview.isActive() ) {
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this.Reveal.overview.deactivate();
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}
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if( event.shiftKey ) {
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this.Reveal.prev();
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}
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else {
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this.Reveal.next();
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}
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}
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// TWO-SPOT, SEMICOLON, B, V, PERIOD, LOGITECH PRESENTER TOOLS "BLACK SCREEN" BUTTON
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else if( keyCode === 58 || keyCode === 59 || keyCode === 66 || keyCode === 86 || keyCode === 190 || keyCode === 191 ) {
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this.Reveal.togglePause();
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}
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// F
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else if( keyCode === 70 ) {
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enterFullscreen( config.embedded ? this.Reveal.getViewportElement() : document.documentElement );
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}
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// A
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else if( keyCode === 65 ) {
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if ( config.autoSlideStoppable ) {
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this.Reveal.toggleAutoSlide( autoSlideWasPaused );
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}
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}
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else {
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triggered = false;
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}
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}
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// If the input resulted in a triggered action we should prevent
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// the browsers default behavior
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if( triggered ) {
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event.preventDefault && event.preventDefault();
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}
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// ESC or O key
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else if( keyCode === 27 || keyCode === 79 ) {
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if( this.Reveal.closeOverlay() === false ) {
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this.Reveal.overview.toggle();
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}
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event.preventDefault && event.preventDefault();
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}
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// If auto-sliding is enabled we need to cue up
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// another timeout
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this.Reveal.cueAutoSlide();
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}
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} |