118 lines
No EOL
2.7 KiB
JavaScript
118 lines
No EOL
2.7 KiB
JavaScript
/**
|
|
* Handles hiding of the pointer/cursor when inactive.
|
|
*/
|
|
export default class Pointer {
|
|
|
|
constructor( Reveal ) {
|
|
|
|
this.Reveal = Reveal;
|
|
|
|
// Throttles mouse wheel navigation
|
|
this.lastMouseWheelStep = 0;
|
|
|
|
// Is the mouse pointer currently hidden from view
|
|
this.cursorHidden = false;
|
|
|
|
// Timeout used to determine when the cursor is inactive
|
|
this.cursorInactiveTimeout = 0;
|
|
|
|
this.onDocumentCursorActive = this.onDocumentCursorActive.bind( this );
|
|
this.onDocumentMouseScroll = this.onDocumentMouseScroll.bind( this );
|
|
|
|
}
|
|
|
|
/**
|
|
* Called when the reveal.js config is updated.
|
|
*/
|
|
configure( config, oldConfig ) {
|
|
|
|
if( config.mouseWheel ) {
|
|
document.addEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false ); // FF
|
|
document.addEventListener( 'mousewheel', this.onDocumentMouseScroll, false );
|
|
}
|
|
else {
|
|
document.removeEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false ); // FF
|
|
document.removeEventListener( 'mousewheel', this.onDocumentMouseScroll, false );
|
|
}
|
|
|
|
// Auto-hide the mouse pointer when its inactive
|
|
if( config.hideInactiveCursor ) {
|
|
document.addEventListener( 'mousemove', this.onDocumentCursorActive, false );
|
|
document.addEventListener( 'mousedown', this.onDocumentCursorActive, false );
|
|
}
|
|
else {
|
|
this.showCursor();
|
|
|
|
document.removeEventListener( 'mousemove', this.onDocumentCursorActive, false );
|
|
document.removeEventListener( 'mousedown', this.onDocumentCursorActive, false );
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Shows the mouse pointer after it has been hidden with
|
|
* #hideCursor.
|
|
*/
|
|
showCursor() {
|
|
|
|
if( this.cursorHidden ) {
|
|
this.cursorHidden = false;
|
|
this.Reveal.getRevealElement().style.cursor = '';
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Hides the mouse pointer when it's on top of the .reveal
|
|
* container.
|
|
*/
|
|
hideCursor() {
|
|
|
|
if( this.cursorHidden === false ) {
|
|
this.cursorHidden = true;
|
|
this.Reveal.getRevealElement().style.cursor = 'none';
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Called whenever there is mouse input at the document level
|
|
* to determine if the cursor is active or not.
|
|
*
|
|
* @param {object} event
|
|
*/
|
|
onDocumentCursorActive( event ) {
|
|
|
|
this.showCursor();
|
|
|
|
clearTimeout( this.cursorInactiveTimeout );
|
|
|
|
this.cursorInactiveTimeout = setTimeout( this.hideCursor.bind( this ), this.Reveal.getConfig().hideCursorTime );
|
|
|
|
}
|
|
|
|
/**
|
|
* Handles mouse wheel scrolling, throttled to avoid skipping
|
|
* multiple slides.
|
|
*
|
|
* @param {object} event
|
|
*/
|
|
onDocumentMouseScroll( event ) {
|
|
|
|
if( Date.now() - this.lastMouseWheelStep > 1000 ) {
|
|
|
|
this.lastMouseWheelStep = Date.now();
|
|
|
|
let delta = event.detail || -event.wheelDelta;
|
|
if( delta > 0 ) {
|
|
this.Reveal.next();
|
|
}
|
|
else if( delta < 0 ) {
|
|
this.Reveal.prev();
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} |