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<h1 class="page-title">Source: src/pixi/display/DisplayObjectContainer.js</h1>
<section>
<article>
<pre class="sunlight-highlight-javascript linenums">/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
/**
* A DisplayObjectContainer represents a collection of display objects.
* It is the base class of all display objects that act as a container for other objects.
*
* @class DisplayObjectContainer
* @extends DisplayObject
* @constructor
*/
PIXI.DisplayObjectContainer = function()
{
PIXI.DisplayObject.call(this);
/**
* [read-only] The array of children of this container.
*
* @property children
* @type Array(DisplayObject)
* @readOnly
*/
this.children = [];
};
// constructor
PIXI.DisplayObjectContainer.prototype = Object.create( PIXI.DisplayObject.prototype );
PIXI.DisplayObjectContainer.prototype.constructor = PIXI.DisplayObjectContainer;
/**
* The width of the displayObjectContainer, setting this will actually modify the scale to achieve the value set
*
* @property width
* @type Number
*/
Object.defineProperty(PIXI.DisplayObjectContainer.prototype, 'width', {
get: function() {
return this.scale.x * this.getLocalBounds().width;
},
set: function(value) {
var width = this.getLocalBounds().width;
if (width !== 0)
{
this.scale.x = value / width;
}
else
{
this.scale.x = 1;
}
this._width = value;
}
});
/**
* The height of the displayObjectContainer, setting this will actually modify the scale to achieve the value set
*
* @property height
* @type Number
*/
Object.defineProperty(PIXI.DisplayObjectContainer.prototype, 'height', {
get: function() {
return this.scale.y * this.getLocalBounds().height;
},
set: function(value) {
var height = this.getLocalBounds().height;
if (height !== 0)
{
this.scale.y = value / height;
}
else
{
this.scale.y = 1;
}
this._height = value;
}
});
/**
* Adds a child to the container.
*
* @method addChild
* @param child {DisplayObject} The DisplayObject to add to the container
* @return {DisplayObject} The child that was added.
*/
PIXI.DisplayObjectContainer.prototype.addChild = function(child)
{
return this.addChildAt(child, this.children.length);
};
/**
* Adds a child to the container at a specified index. If the index is out of bounds an error will be thrown
*
* @method addChildAt
* @param child {DisplayObject} The child to add
* @param index {Number} The index to place the child in
* @return {DisplayObject} The child that was added.
*/
PIXI.DisplayObjectContainer.prototype.addChildAt = function(child, index)
{
if(index >= 0 && index <= this.children.length)
{
if(child.parent)
{
child.parent.removeChild(child);
}
child.parent = this;
this.children.splice(index, 0, child);
if(this.stage)child.setStageReference(this.stage);
return child;
}
else
{
throw new Error(child + 'addChildAt: The index '+ index +' supplied is out of bounds ' + this.children.length);
}
};
/**
* Swaps the position of 2 Display Objects within this container.
*
* @method swapChildren
* @param child {DisplayObject}
* @param child2 {DisplayObject}
*/
PIXI.DisplayObjectContainer.prototype.swapChildren = function(child, child2)
{
if(child === child2) {
return;
}
var index1 = this.getChildIndex(child);
var index2 = this.getChildIndex(child2);
if(index1 < 0 || index2 < 0) {
throw new Error('swapChildren: Both the supplied DisplayObjects must be a child of the caller.');
}
this.children[index1] = child2;
this.children[index2] = child;
};
/**
* Returns the index position of a child DisplayObject instance
*
* @method getChildIndex
* @param child {DisplayObject} The DisplayObject instance to identify
* @return {Number} The index position of the child display object to identify
*/
PIXI.DisplayObjectContainer.prototype.getChildIndex = function(child)
{
var 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
*
* @method setChildIndex
* @param child {DisplayObject} The child DisplayObject instance for which you want to change the index number
* @param index {Number} The resulting index number for the child display object
*/
PIXI.DisplayObjectContainer.prototype.setChildIndex = function(child, index)
{
if (index < 0 || index >= this.children.length)
{
throw new Error('The supplied index is out of bounds');
}
var currentIndex = this.getChildIndex(child);
this.children.splice(currentIndex, 1); //remove from old position
this.children.splice(index, 0, child); //add at new position
};
/**
* Returns the child at the specified index
*
* @method getChildAt
* @param index {Number} The index to get the child from
* @return {DisplayObject} The child at the given index, if any.
*/
PIXI.DisplayObjectContainer.prototype.getChildAt = function(index)
{
if (index < 0 || index >= this.children.length)
{
throw new Error('getChildAt: Supplied index '+ index +' does not exist in the child list, or the supplied DisplayObject must be a child of the caller');
}
return this.children[index];
};
/**
* Removes a child from the container.
*
* @method removeChild
* @param child {DisplayObject} The DisplayObject to remove
* @return {DisplayObject} The child that was removed.
*/
PIXI.DisplayObjectContainer.prototype.removeChild = function(child)
{
var index = this.children.indexOf( child );
if(index === -1)return;
return this.removeChildAt( index );
};
/**
* Removes a child from the specified index position.
*
* @method removeChildAt
* @param index {Number} The index to get the child from
* @return {DisplayObject} The child that was removed.
*/
PIXI.DisplayObjectContainer.prototype.removeChildAt = function(index)
{
var child = this.getChildAt( index );
if(this.stage)
child.removeStageReference();
child.parent = undefined;
this.children.splice( index, 1 );
return child;
};
/**
* Removes all children from this container that are within the begin and end indexes.
*
* @method removeChildren
* @param beginIndex {Number} The beginning position. Default value is 0.
* @param endIndex {Number} The ending position. Default value is size of the container.
*/
PIXI.DisplayObjectContainer.prototype.removeChildren = function(beginIndex, endIndex)
{
var begin = beginIndex || 0;
var end = typeof endIndex === 'number' ? endIndex : this.children.length;
var range = end - begin;
if (range > 0 && range <= end)
{
var removed = this.children.splice(begin, range);
for (var i = 0; i < removed.length; i++) {
var child = removed[i];
if(this.stage)
child.removeStageReference();
child.parent = undefined;
}
return removed;
}
else if (range === 0 && this.children.length === 0)
{
return [];
}
else
{
throw new Error( 'removeChildren: Range Error, numeric values are outside the acceptable range' );
}
};
/*
* Updates the transform on all children of this container for rendering
*
* @method updateTransform
* @private
*/
PIXI.DisplayObjectContainer.prototype.updateTransform = function()
{
if (!this.visible)
{
return;
}
this.displayObjectUpdateTransform();
if (this._cacheAsBitmap)
{
return;
}
for (var i = 0; i < this.children.length; i++)
{
this.children[i].updateTransform();
}
};
// performance increase to avoid using call.. (10x faster)
PIXI.DisplayObjectContainer.prototype.displayObjectContainerUpdateTransform = PIXI.DisplayObjectContainer.prototype.updateTransform;
/**
* Retrieves the bounds of the displayObjectContainer as a rectangle. The bounds calculation takes all visible children into consideration.
*
* @method getBounds
* @return {Rectangle} The rectangular bounding area
*/
PIXI.DisplayObjectContainer.prototype.getBounds = function()
{
if (this.children.length === 0)
{
return PIXI.EmptyRectangle;
}
var minX = Infinity;
var minY = Infinity;
var maxX = -Infinity;
var maxY = -Infinity;
var childBounds;
var childMaxX;
var childMaxY;
var childVisible = false;
for (var i = 0; i < this.children.length; i++)
{
var child = this.children[i];
if (!child.visible)
{
continue;
}
childVisible = true;
childBounds = this.children[i].getBounds();
minX = minX < childBounds.x ? minX : childBounds.x;
minY = minY < childBounds.y ? minY : childBounds.y;
childMaxX = childBounds.width + childBounds.x;
childMaxY = childBounds.height + childBounds.y;
maxX = maxX > childMaxX ? maxX : childMaxX;
maxY = maxY > childMaxY ? maxY : childMaxY;
}
if (!childVisible)
{
return PIXI.EmptyRectangle;
}
var bounds = this._bounds;
bounds.x = minX;
bounds.y = minY;
bounds.width = maxX - minX;
bounds.height = maxY - minY;
return bounds;
};
/**
* Retrieves the non-global local bounds of the displayObjectContainer as a rectangle. The calculation takes all visible children into consideration.
*
* @method getLocalBounds
* @return {Rectangle} The rectangular bounding area
*/
PIXI.DisplayObjectContainer.prototype.getLocalBounds = function()
{
var matrixCache = this.worldTransform;
this.worldTransform = PIXI.identityMatrix;
for (var i = 0; i < this.children.length; i++)
{
this.children[i].updateTransform();
}
var bounds = this.getBounds();
this.worldTransform = matrixCache;
for (i = 0; i < this.children.length; i++)
{
this.children[i].updateTransform();
}
return bounds;
};
/**
* Sets the containers Stage reference. This is the Stage that this object, and all of its children, is connected to.
*
* @method setStageReference
* @param stage {Stage} the stage that the container will have as its current stage reference
*/
PIXI.DisplayObjectContainer.prototype.setStageReference = function(stage)
{
this.stage = stage;
for (var i=0; i < this.children.length; i++)
{
this.children[i].setStageReference(stage)
}
};
/**
* Removes the current stage reference from the container and all of its children.
*
* @method removeStageReference
*/
PIXI.DisplayObjectContainer.prototype.removeStageReference = function()
{
for (var i = 0; i < this.children.length; i++)
{
this.children[i].removeStageReference();
}
this.stage = null;
};
/**
* Renders the object using the WebGL renderer
*
* @method _renderWebGL
* @param renderSession {RenderSession}
* @private
*/
PIXI.DisplayObjectContainer.prototype._renderWebGL = function(renderSession)
{
if (!this.visible || this.alpha <= 0) return;
if (this._cacheAsBitmap)
{
this._renderCachedSprite(renderSession);
return;
}
var i;
if (this._mask || this._filters)
{
// push filter first as we need to ensure the stencil buffer is correct for any masking
if (this._filters)
{
renderSession.spriteBatch.flush();
renderSession.filterManager.pushFilter(this._filterBlock);
}
if (this._mask)
{
renderSession.spriteBatch.stop();
renderSession.maskManager.pushMask(this.mask, renderSession);
renderSession.spriteBatch.start();
}
// simple render children!
for (i = 0; i < this.children.length; i++)
{
this.children[i]._renderWebGL(renderSession);
}
renderSession.spriteBatch.stop();
if (this._mask) renderSession.maskManager.popMask(this._mask, renderSession);
if (this._filters) renderSession.filterManager.popFilter();
renderSession.spriteBatch.start();
}
else
{
// simple render children!
for (i = 0; i < this.children.length; i++)
{
this.children[i]._renderWebGL(renderSession);
}
}
};
/**
* Renders the object using the Canvas renderer
*
* @method _renderCanvas
* @param renderSession {RenderSession}
* @private
*/
PIXI.DisplayObjectContainer.prototype._renderCanvas = function(renderSession)
{
if (this.visible === false || this.alpha === 0) return;
if (this._cacheAsBitmap)
{
this._renderCachedSprite(renderSession);
return;
}
if (this._mask)
{
renderSession.maskManager.pushMask(this._mask, renderSession);
}
for (var i = 0; i < this.children.length; i++)
{
this.children[i]._renderCanvas(renderSession);
}
if (this._mask)
{
renderSession.maskManager.popMask(renderSession);
}
};
</pre>
</article>
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