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export default ( elemId, args ) => { |
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return { |
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prevVisibleItemCount: 0, |
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prevFilterString: '', |
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events: {}, |
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on( event, callback ) { |
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if ( ! this.events.hasOwnProperty( event ) ) { |
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this.events[ event ] = []; |
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} |
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|
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this.events[ event ].push( callback ); |
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}, |
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fireEvent( event, data = {} ) { |
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if ( this.events.hasOwnProperty( event ) ) { |
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for ( let callback of this.events[ event ] ) { |
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callback( data ); |
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} |
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} |
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|
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// Global init event. |
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if ( 'initReady' === event ) { |
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window.dispatchEvent( new CustomEvent( 'wpupgInitReady', { |
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detail: this, |
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} ) ); |
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} |
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}, |
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initEvents() { |
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// Initial state. |
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this.prevVisibleItemCount = this.isotope.getFilteredItemElements().length; |
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this.prevFilterString = this.getFilterString(); |
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|
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// Check for changes. |
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this.isotope.on( 'layoutComplete', () => { |
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const currVisibleItemCount = this.isotope.getFilteredItemElements().length; |
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const currFilterString = this.getFilterString(); |
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|
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if ( currVisibleItemCount !== this.prevVisibleItemCount || currFilterString !== this.prevFilterString ) { |
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this.fireEvent( 'visibleItemsChanged' ); |
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|
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this.prevFilterString = currFilterString; |
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} |
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} ); |
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|
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// Don't wait for animation to update visible item count. |
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this.on( 'filter', () => { |
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this.prevVisibleItemCount = this.isotope.getFilteredItemElements().length; |
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}); |
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}, |
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} |
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}; |
