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import { Vector2 } from 'three';
class SelectionHelper {
constructor( renderer, cssClassName ) {
this.element = document.createElement( 'div' );
this.element.classList.add( cssClassName );
this.element.style.pointerEvents = 'none';
this.renderer = renderer;
this.startPoint = new Vector2();
this.pointTopLeft = new Vector2();
this.pointBottomRight = new Vector2();
this.isDown = false;
this.enabled = true;
this.onPointerDown = function ( event ) {
if ( this.enabled === false ) return;
this.isDown = true;
this.onSelectStart( event );
}.bind( this );
this.onPointerMove = function ( event ) {
if ( this.enabled === false ) return;
if ( this.isDown ) {
this.onSelectMove( event );
}
}.bind( this );
this.onPointerUp = function ( ) {
if ( this.enabled === false ) return;
this.isDown = false;
this.onSelectOver();
}.bind( this );
this.renderer.domElement.addEventListener( 'pointerdown', this.onPointerDown );
this.renderer.domElement.addEventListener( 'pointermove', this.onPointerMove );
this.renderer.domElement.addEventListener( 'pointerup', this.onPointerUp );
}
dispose() {
this.renderer.domElement.removeEventListener( 'pointerdown', this.onPointerDown );
this.renderer.domElement.removeEventListener( 'pointermove', this.onPointerMove );
this.renderer.domElement.removeEventListener( 'pointerup', this.onPointerUp );
}
onSelectStart( event ) {
this.element.style.display = 'none';
this.renderer.domElement.parentElement.appendChild( this.element );
this.element.style.left = event.clientX + 'px';
this.element.style.top = event.clientY + 'px';
this.element.style.width = '0px';
this.element.style.height = '0px';
this.startPoint.x = event.clientX;
this.startPoint.y = event.clientY;
}
onSelectMove( event ) {
this.element.style.display = 'block';
this.pointBottomRight.x = Math.max( this.startPoint.x, event.clientX );
this.pointBottomRight.y = Math.max( this.startPoint.y, event.clientY );
this.pointTopLeft.x = Math.min( this.startPoint.x, event.clientX );
this.pointTopLeft.y = Math.min( this.startPoint.y, event.clientY );
this.element.style.left = this.pointTopLeft.x + 'px';
this.element.style.top = this.pointTopLeft.y + 'px';
this.element.style.width = ( this.pointBottomRight.x - this.pointTopLeft.x ) + 'px';
this.element.style.height = ( this.pointBottomRight.y - this.pointTopLeft.y ) + 'px';
}
onSelectOver() {
this.element.parentElement.removeChild( this.element );
}
}
export { SelectionHelper };