127 lines
2.8 KiB
JavaScript
127 lines
2.8 KiB
JavaScript
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/**
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* Handles hiding of the pointer/cursor when inactive.
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*/
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export default class Pointer {
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constructor( Reveal ) {
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this.Reveal = Reveal;
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// Throttles mouse wheel navigation
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this.lastMouseWheelStep = 0;
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// Is the mouse pointer currently hidden from view
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this.cursorHidden = false;
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// Timeout used to determine when the cursor is inactive
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this.cursorInactiveTimeout = 0;
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this.onDocumentCursorActive = this.onDocumentCursorActive.bind( this );
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this.onDocumentMouseScroll = this.onDocumentMouseScroll.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.mouseWheel ) {
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document.addEventListener( 'wheel', this.onDocumentMouseScroll, false );
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}
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else {
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document.removeEventListener( 'wheel', this.onDocumentMouseScroll, false );
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}
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// Auto-hide the mouse pointer when its inactive
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if( config.hideInactiveCursor ) {
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document.addEventListener( 'mousemove', this.onDocumentCursorActive, false );
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document.addEventListener( 'mousedown', this.onDocumentCursorActive, false );
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}
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else {
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this.showCursor();
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document.removeEventListener( 'mousemove', this.onDocumentCursorActive, false );
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document.removeEventListener( 'mousedown', this.onDocumentCursorActive, false );
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}
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}
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/**
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* Shows the mouse pointer after it has been hidden with
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* #hideCursor.
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*/
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showCursor() {
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if( this.cursorHidden ) {
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this.cursorHidden = false;
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this.Reveal.getRevealElement().style.cursor = '';
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}
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}
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/**
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* Hides the mouse pointer when it's on top of the .reveal
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* container.
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*/
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hideCursor() {
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if( this.cursorHidden === false ) {
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this.cursorHidden = true;
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this.Reveal.getRevealElement().style.cursor = 'none';
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}
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}
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destroy() {
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this.showCursor();
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document.removeEventListener( 'wheel', this.onDocumentMouseScroll, false );
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document.removeEventListener( 'mousemove', this.onDocumentCursorActive, false );
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document.removeEventListener( 'mousedown', this.onDocumentCursorActive, false );
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}
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/**
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* Called whenever there is mouse input at the document level
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* to determine if the cursor is active or not.
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*
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* @param {object} event
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*/
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onDocumentCursorActive( event ) {
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this.showCursor();
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clearTimeout( this.cursorInactiveTimeout );
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this.cursorInactiveTimeout = setTimeout( this.hideCursor.bind( this ), this.Reveal.getConfig().hideCursorTime );
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}
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/**
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* Handles mouse wheel scrolling, throttled to avoid skipping
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* multiple slides.
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*
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* @param {object} event
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*/
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onDocumentMouseScroll( event ) {
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if( Date.now() - this.lastMouseWheelStep > 1000 ) {
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this.lastMouseWheelStep = Date.now();
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let delta = event.detail || -event.wheelDelta;
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if( delta > 0 ) {
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this.Reveal.next();
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}
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else if( delta < 0 ) {
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this.Reveal.prev();
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}
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}
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}
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}
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