import { removeItems } from '../utils';
import DisplayObject from './DisplayObject';
/**
* A Container represents a collection of display objects.
* It is the base class of all display objects that act as a container for other objects.
*
*```js
* let container = new PIXI.Container();
* container.addChild(sprite);
* ```
*
* @class
* @extends PIXI.DisplayObject
* @memberof PIXI
*/
export default class Container extends DisplayObject
{
/**
*
*/
constructor()
{
super();
/**
* The array of children of this container.
*
* @member {PIXI.DisplayObject[]}
* @readonly
*/
this.children = [];
}
/**
* Overridable method that can be used by Container subclasses whenever the children array is modified
*
* @private
*/
onChildrenChange()
{
/* empty */
}
/**
* Adds one or more children to the container.
*
* Multiple items can be added like so: `myContainer.addChild(thingOne, thingTwo, thingThree)`
*
* @param {...PIXI.DisplayObject} child - The DisplayObject(s) to add to the container
* @return {PIXI.DisplayObject} The first child that was added.
*/
addChild(child)
{
const argumentsLength = arguments.length;
// if there is only one argument we can bypass looping through the them
if (argumentsLength > 1)
{
// loop through the arguments property and add all children
// use it the right way (.length and [i]) so that this function can still be optimised by JS runtimes
for (let i = 0; i < argumentsLength; i++)
{
this.addChild(arguments[i]);
}
}
else
{
// if the child has a parent then lets remove it as Pixi objects can only exist in one place
if (child.parent)
{
child.parent.removeChild(child);
}
child.parent = this;
// ensure a transform will be recalculated..
this.transform._parentID = -1;
this._boundsID++;
this.children.push(child);
// TODO - lets either do all callbacks or all events.. not both!
this.onChildrenChange(this.children.length - 1);
child.emit('added', this);
}
return child;
}
/**
* Adds a child to the container at a specified index. If the index is out of bounds an error will be thrown
*
* @param {PIXI.DisplayObject} child - The child to add
* @param {number} index - The index to place the child in
* @return {PIXI.DisplayObject} The child that was added.
*/
addChildAt(child, index)
{
if (index < 0 || index > this.children.length)
{
throw new Error(`${child}addChildAt: The index ${index} supplied is out of bounds ${this.children.length}`);
}
if (child.parent)
{
child.parent.removeChild(child);
}
child.parent = this;
this.children.splice(index, 0, child);
// TODO - lets either do all callbacks or all events.. not both!
this.onChildrenChange(index);
child.emit('added', this);
return child;
}
/**
* Swaps the position of 2 Display Objects within this container.
*
* @param {PIXI.DisplayObject} child - First display object to swap
* @param {PIXI.DisplayObject} child2 - Second display object to swap
*/
swapChildren(child, child2)
{
if (child === child2)
{
return;
}
const index1 = this.getChildIndex(child);
const index2 = this.getChildIndex(child2);
this.children[index1] = child2;
this.children[index2] = child;
this.onChildrenChange(index1 < index2 ? index1 : index2);
}
/**
* Returns the index position of a child DisplayObject instance
*
* @param {PIXI.DisplayObject} child - The DisplayObject instance to identify
* @return {number} The index position of the child display object to identify
*/
getChildIndex(child)
{
const index = this.children.indexOf(child);
if (index === -1)
{
throw new Error('The supplied DisplayObject must be a child of the caller');
}
return index;
}
/**
* Changes the position of an existing child in the display object container
*
* @param {PIXI.DisplayObject} child - The child DisplayObject instance for which you want to change the index number
* @param {number} index - The resulting index number for the child display object
*/
setChildIndex(child, index)
{
if (index < 0 || index >= this.children.length)
{
throw new Error('The supplied index is out of bounds');
}
const currentIndex = this.getChildIndex(child);
removeItems(this.children, currentIndex, 1); // remove from old position
this.children.splice(index, 0, child); // add at new position
this.onChildrenChange(index);
}
/**
* Returns the child at the specified index
*
* @param {number} index - The index to get the child at
* @return {PIXI.DisplayObject} The child at the given index, if any.
*/
getChildAt(index)
{
if (index < 0 || index >= this.children.length)
{
throw new Error(`getChildAt: Index (${index}) does not exist.`);
}
return this.children[index];
}
/**
* Removes one or more children from the container.
*
* @param {...PIXI.DisplayObject} child - The DisplayObject(s) to remove
* @return {PIXI.DisplayObject} The first child that was removed.
*/
removeChild(child)
{
const argumentsLength = arguments.length;
// if there is only one argument we can bypass looping through the them
if (argumentsLength > 1)
{
// loop through the arguments property and add all children
// use it the right way (.length and [i]) so that this function can still be optimised by JS runtimes
for (let i = 0; i < argumentsLength; i++)
{
this.removeChild(arguments[i]);
}
}
else
{
const index = this.children.indexOf(child);
if (index === -1) return null;
child.parent = null;
removeItems(this.children, index, 1);
// ensure a transform will be recalculated..
this.transform._parentID = -1;
this._boundsID++;
// TODO - lets either do all callbacks or all events.. not both!
this.onChildrenChange(index);
child.emit('removed', this);
}
return child;
}
/**
* Removes a child from the specified index position.
*
* @param {number} index - The index to get the child from
* @return {PIXI.DisplayObject} The child that was removed.
*/
removeChildAt(index)
{
const child = this.getChildAt(index);
child.parent = null;
removeItems(this.children, index, 1);
// TODO - lets either do all callbacks or all events.. not both!
this.onChildrenChange(index);
child.emit('removed', this);
return child;
}
/**
* Removes all children from this container that are within the begin and end indexes.
*
* @param {number} [beginIndex=0] - The beginning position.
* @param {number} [endIndex=this.children.length] - The ending position. Default value is size of the container.
* @returns {DisplayObject[]} List of removed children
*/
removeChildren(beginIndex = 0, endIndex)
{
const begin = beginIndex;
const end = typeof endIndex === 'number' ? endIndex : this.children.length;
const range = end - begin;
let removed;
if (range > 0 && range <= end)
{
removed = this.children.splice(begin, range);
for (let i = 0; i < removed.length; ++i)
{
removed[i].parent = null;
}
this.onChildrenChange(beginIndex);
for (let i = 0; i < removed.length; ++i)
{
removed[i].emit('removed', this);
}
return removed;
}
else if (range === 0 && this.children.length === 0)
{
return [];
}
throw new RangeError('removeChildren: numeric values are outside the acceptable range.');
}
/**
* Updates the transform on all children of this container for rendering
*
* @private
*/
updateTransform()
{
this._boundsID++;
this.transform.updateTransform(this.parent.transform);
// TODO: check render flags, how to process stuff here
this.worldAlpha = this.alpha * this.parent.worldAlpha;
for (let i = 0, j = this.children.length; i < j; ++i)
{
const child = this.children[i];
if (child.visible)
{
child.updateTransform();
}
}
}
/**
* Recalculates the bounds of the container.
*
*/
calculateBounds()
{
this._bounds.clear();
this._calculateBounds();
for (let i = 0; i < this.children.length; i++)
{
const child = this.children[i];
if (!child.visible || !child.renderable)
{
continue;
}
child.calculateBounds();
// TODO: filter+mask, need to mask both somehow
if (child._mask)
{
child._mask.calculateBounds();
this._bounds.addBoundsMask(child._bounds, child._mask._bounds);
}
else if (child.filterArea)
{
this._bounds.addBoundsArea(child._bounds, child.filterArea);
}
else
{
this._bounds.addBounds(child._bounds);
}
}
this._lastBoundsID = this._boundsID;
}
/**
* Recalculates the bounds of the object. Override this to
* calculate the bounds of the specific object (not including children).
*
*/
_calculateBounds()
{
// FILL IN//
}
/**
* Renders the object using the WebGL renderer
*
* @param {PIXI.WebGLRenderer} renderer - The renderer
*/
renderWebGL(renderer)
{
// if the object is not visible or the alpha is 0 then no need to render this element
if (!this.visible || this.worldAlpha <= 0 || !this.renderable)
{
return;
}
// do a quick check to see if this element has a mask or a filter.
if (this._mask || this._filters)
{
this.renderAdvancedWebGL(renderer);
}
else
{
this._renderWebGL(renderer);
// simple render children!
for (let i = 0, j = this.children.length; i < j; ++i)
{
this.children[i].renderWebGL(renderer);
}
}
}
/**
* Render the object using the WebGL renderer and advanced features.
*
* @private
* @param {PIXI.WebGLRenderer} renderer - The renderer
*/
renderAdvancedWebGL(renderer)
{
renderer.flush();
const filters = this._filters;
const mask = this._mask;
// push filter first as we need to ensure the stencil buffer is correct for any masking
if (filters)
{
if (!this._enabledFilters)
{
this._enabledFilters = [];
}
this._enabledFilters.length = 0;
for (let i = 0; i < filters.length; i++)
{
if (filters[i].enabled)
{
this._enabledFilters.push(filters[i]);
}
}
if (this._enabledFilters.length)
{
renderer.filterManager.pushFilter(this, this._enabledFilters);
}
}
if (mask)
{
renderer.maskManager.pushMask(this, this._mask);
}
// add this object to the batch, only rendered if it has a texture.
this._renderWebGL(renderer);
// now loop through the children and make sure they get rendered
for (let i = 0, j = this.children.length; i < j; i++)
{
this.children[i].renderWebGL(renderer);
}
renderer.flush();
if (mask)
{
renderer.maskManager.popMask(this, this._mask);
}
if (filters && this._enabledFilters && this._enabledFilters.length)
{
renderer.filterManager.popFilter();
}
}
/**
* To be overridden by the subclasses.
*
* @private
* @param {PIXI.WebGLRenderer} renderer - The renderer
*/
_renderWebGL(renderer) // eslint-disable-line no-unused-vars
{
// this is where content itself gets rendered...
}
/**
* To be overridden by the subclass
*
* @private
* @param {PIXI.CanvasRenderer} renderer - The renderer
*/
_renderCanvas(renderer) // eslint-disable-line no-unused-vars
{
// this is where content itself gets rendered...
}
/**
* Renders the object using the Canvas renderer
*
* @param {PIXI.CanvasRenderer} renderer - The renderer
*/
renderCanvas(renderer)
{
// if not visible or the alpha is 0 then no need to render this
if (!this.visible || this.worldAlpha <= 0 || !this.renderable)
{
return;
}
if (this._mask)
{
renderer.maskManager.pushMask(this._mask);
}
this._renderCanvas(renderer);
for (let i = 0, j = this.children.length; i < j; ++i)
{
this.children[i].renderCanvas(renderer);
}
if (this._mask)
{
renderer.maskManager.popMask(renderer);
}
}
/**
* Removes all internal references and listeners as well as removes children from the display list.
* Do not use a Container after calling `destroy`.
*
* @param {object|boolean} [options] - Options parameter. A boolean will act as if all options
* have been set to that value
* @param {boolean} [options.children=false] - if set to true, all the children will have their destroy
* method called as well. 'options' will be passed on to those calls.
*/
destroy(options)
{
super.destroy();
const destroyChildren = typeof options === 'boolean' ? options : options && options.children;
const oldChildren = this.removeChildren(0, this.children.length);
if (destroyChildren)
{
for (let i = 0; i < oldChildren.length; ++i)
{
oldChildren[i].destroy(options);
}
}
}
/**
* The width of the Container, setting this will actually modify the scale to achieve the value set
*
* @member {number}
* @memberof PIXI.Container#
*/
get width()
{
return this.scale.x * this.getLocalBounds().width;
}
/**
* Sets the width of the container by modifying the scale.
*
* @param {number} value - The value to set to.
*/
set width(value)
{
const width = this.getLocalBounds().width;
if (width !== 0)
{
this.scale.x = value / width;
}
else
{
this.scale.x = 1;
}
this._width = value;
}
/**
* The height of the Container, setting this will actually modify the scale to achieve the value set
*
* @member {number}
* @memberof PIXI.Container#
*/
get height()
{
return this.scale.y * this.getLocalBounds().height;
}
/**
* Sets the height of the container by modifying the scale.
*
* @param {number} value - The value to set to.
*/
set height(value)
{
const height = this.getLocalBounds().height;
if (height !== 0)
{
this.scale.y = value / height;
}
else
{
this.scale.y = 1;
}
this._height = value;
}
}
// performance increase to avoid using call.. (10x faster)
Container.prototype.containerUpdateTransform = Container.prototype.updateTransform;
