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import Vector2d from "./../math/vector2.js";
import * as input from "./../input/input.js";
import * as event from "./../system/event.js";
import Renderable from "./../renderable/renderable.js";
/**
* @classdesc
* A Draggable base object
* @see DropTarget
* @augments Renderable
*/
export class Draggable extends Renderable {
/**
* @param {number} x - the x coordinates of the draggable object
* @param {number} y - the y coordinates of the draggable object
* @param {number} width - draggable object width
* @param {number} height - draggable object height
*/
constructor(x, y, width, height) {
super(x, y, width, height);
this.isKinematic = false;
this.dragging = false;
this.dragId = null;
this.grabOffset = new Vector2d(0, 0);
this.initEvents();
}
/**
* Initializes the events the modules needs to listen to
* It translates the pointer events to me.events
* in order to make them pass through the system and to make
* this module testable. Then we subscribe this module to the
* transformed events.
* @name initEvents
* @memberof Draggable
* @private
*/
initEvents() {
input.registerPointerEvent("pointerdown", this, (e) => event.emit(event.DRAGSTART, e, this));
input.registerPointerEvent("pointerup", this, (e) => event.emit(event.DRAGEND, e, this));
input.registerPointerEvent("pointercancel", this, (e) => event.emit(event.DRAGEND, e, this));
event.on(event.POINTERMOVE, (e) => this.dragMove(e));
event.on(event.DRAGSTART, (e, draggable) => {
if (draggable === this) {
this.dragStart(e);
}
});
event.on(event.DRAGEND, (e, draggable) => {
if (draggable === this) {
this.dragEnd(e);
}
});
}
/**
* Gets called when the user starts dragging the entity
* @name dragStart
* @memberof Draggable
* @param {object} e - the pointer event
* @returns {boolean} false if the object is being dragged
*/
dragStart(e) {
if (this.dragging === false) {
this.dragging = true;
this.grabOffset.set(e.gameX, e.gameY);
this.grabOffset.sub(this.pos);
return false;
}
}
/**
* Gets called when the user drags this entity around
* @name dragMove
* @memberof Draggable
* @param {object} e - the pointer event
*/
dragMove(e) {
if (this.dragging === true) {
this.pos.set(e.gameX, e.gameY, this.pos.z); //TODO : z ?
this.pos.sub(this.grabOffset);
}
}
/**
* Gets called when the user stops dragging the entity
* @name dragEnd
* @memberof Draggable
* @returns {boolean} false if the object stopped being dragged
*/
dragEnd() {
if (this.dragging === true) {
this.dragging = false;
return false;
}
}
/**
* Destructor
* @name destroy
* @memberof Draggable
* @ignore
*/
destroy() {
event.off(event.POINTERMOVE, this.dragMove);
event.off(event.DRAGSTART, this.dragStart);
event.off(event.DRAGEND, this.dragEnd);
input.releasePointerEvent("pointerdown", this);
input.releasePointerEvent("pointerup", this);
input.releasePointerEvent("pointercancel", this);
super.destroy();
}
}