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// Copyright 2007 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview A thicker wrapper around graphics groups.
* @author robbyw@google.com (Robby Walker)
*/
goog.provide('goog.graphics.ext.Group');
goog.require('goog.graphics.ext.Element');
/**
* Wrapper for a graphics group.
* @param {goog.graphics.ext.Group} group Parent for this element. Can
* be null if this is a Graphics instance.
* @param {goog.graphics.GroupElement=} opt_wrapper The thin wrapper
* to wrap. If omitted, a new group will be created. Must be included
* when group is null.
* @constructor
* @extends {goog.graphics.ext.Element}
*/
goog.graphics.ext.Group = function(group, opt_wrapper) {
opt_wrapper = opt_wrapper || group.getGraphicsImplementation().createGroup(
group.getWrapper());
goog.graphics.ext.Element.call(this, group, opt_wrapper);
/**
* Array of child elements this group contains.
* @type {Array.<goog.graphics.ext.Element>}
* @private
*/
this.children_ = [];
};
goog.inherits(goog.graphics.ext.Group, goog.graphics.ext.Element);
/**
* Add an element to the group. This should be treated as package local, as
* it is called by the draw* methods.
* @param {!goog.graphics.ext.Element} element The element to add.
* @param {boolean=} opt_chain Whether this addition is part of a longer set
* of element additions.
*/
goog.graphics.ext.Group.prototype.addChild = function(element, opt_chain) {
if (!goog.array.contains(this.children_, element)) {
this.children_.push(element);
}
var transformed = this.growToFit_(element);
if (element.isParentDependent()) {
element.parentTransform();
}
if (!opt_chain && element.isPendingTransform()) {
element.reset();
}
if (transformed) {
this.reset();
}
};
/**
* Remove an element from the group.
* @param {goog.graphics.ext.Element} element The element to remove.
*/
goog.graphics.ext.Group.prototype.removeChild = function(element) {
goog.array.remove(this.children_, element);
// TODO(robbyw): shape.fireEvent('delete')
this.getGraphicsImplementation().removeElement(element.getWrapper());
};
/**
* Calls the given function on each of this component's children in order. If
* {@code opt_obj} is provided, it will be used as the 'this' object in the
* function when called. The function should take two arguments: the child
* component and its 0-based index. The return value is ignored.
* @param {Function} f The function to call for every child component; should
* take 2 arguments (the child and its index).
* @param {Object=} opt_obj Used as the 'this' object in f when called.
*/
goog.graphics.ext.Group.prototype.forEachChild = function(f, opt_obj) {
if (this.children_) {
goog.array.forEach(this.children_, f, opt_obj);
}
};
/**
* @return {goog.graphics.GroupElement} The underlying thin wrapper.
* @protected
*/
goog.graphics.ext.Group.prototype.getWrapper;
/**
* Reset the element.
* @override
*/
goog.graphics.ext.Group.prototype.reset = function() {
goog.graphics.ext.Group.superClass_.reset.call(this);
this.updateChildren();
};
/**
* Called from the parent class, this method resets any pre-computed positions
* and sizes.
* @protected
* @override
*/
goog.graphics.ext.Group.prototype.redraw = function() {
this.getWrapper().setSize(this.getWidth(), this.getHeight());
this.transformChildren();
};
/**
* Transform the children that need to be transformed.
* @protected
*/
goog.graphics.ext.Group.prototype.transformChildren = function() {
this.forEachChild(function(child) {
if (child.isParentDependent()) {
child.parentTransform();
}
});
};
/**
* As part of the reset process, update child elements.
*/
goog.graphics.ext.Group.prototype.updateChildren = function() {
this.forEachChild(function(child) {
if (child.isParentDependent() || child.isPendingTransform()) {
child.reset();
} else if (child.updateChildren) {
child.updateChildren();
}
});
};
/**
* When adding an element, grow this group's bounds to fit it.
* @param {!goog.graphics.ext.Element} element The added element.
* @return {boolean} Whether the size of this group changed.
* @private
*/
goog.graphics.ext.Group.prototype.growToFit_ = function(element) {
var transformed = false;
var x = element.getMaxX();
if (x > this.getWidth()) {
this.setMinWidth(x);
transformed = true;
}
var y = element.getMaxY();
if (y > this.getHeight()) {
this.setMinHeight(y);
transformed = true;
}
return transformed;
};
/**
* @return {number} The width of the element's coordinate space.
*/
goog.graphics.ext.Group.prototype.getCoordinateWidth = function() {
return this.getWidth();
};
/**
* @return {number} The height of the element's coordinate space.
*/
goog.graphics.ext.Group.prototype.getCoordinateHeight = function() {
return this.getHeight();
};
/**
* Remove all drawing elements from the group.
*/
goog.graphics.ext.Group.prototype.clear = function() {
while (this.children_.length) {
this.removeChild(this.children_[0]);
}
};
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