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// Copyright 2006 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 Animated zippy widget implementation.
*
* @author eae@google.com (Emil A Eklund)
* @see ../demos/zippy.html
*/
goog.provide('goog.ui.AnimatedZippy');
goog.require('goog.dom');
goog.require('goog.events');
goog.require('goog.fx.Animation');
goog.require('goog.fx.Animation.EventType');
goog.require('goog.fx.Transition.EventType');
goog.require('goog.fx.easing');
goog.require('goog.ui.Zippy');
goog.require('goog.ui.ZippyEvent');
/**
* Zippy widget. Expandable/collapsible container, clicking the header toggles
* the visibility of the content.
*
* @param {Element|string|null} header Header element, either element
* reference, string id or null if no header exists.
* @param {Element|string} content Content element, either element reference or
* string id.
* @param {boolean=} opt_expanded Initial expanded/visibility state. Defaults to
* false.
* @constructor
* @extends {goog.ui.Zippy}
*/
goog.ui.AnimatedZippy = function(header, content, opt_expanded) {
// Create wrapper element and move content into it.
var elWrapper = goog.dom.createDom('div', {'style': 'overflow:hidden'});
var elContent = goog.dom.getElement(content);
elContent.parentNode.replaceChild(elWrapper, elContent);
elWrapper.appendChild(elContent);
/**
* Content wrapper, used for animation.
* @type {Element}
* @private
*/
this.elWrapper_ = elWrapper;
/**
* Reference to animation or null if animation is not active.
* @type {goog.fx.Animation}
* @private
*/
this.anim_ = null;
// Call constructor of super class.
goog.ui.Zippy.call(this, header, elContent, opt_expanded);
// Set initial state.
// NOTE: Set the class names as well otherwise animated zippys
// start with empty class names.
var expanded = this.isExpanded();
this.elWrapper_.style.display = expanded ? '' : 'none';
this.updateHeaderClassName(expanded);
};
goog.inherits(goog.ui.AnimatedZippy, goog.ui.Zippy);
/**
* Duration of expand/collapse animation, in milliseconds.
* @type {number}
*/
goog.ui.AnimatedZippy.prototype.animationDuration = 500;
/**
* Acceleration function for expand/collapse animation.
* @type {!Function}
*/
goog.ui.AnimatedZippy.prototype.animationAcceleration = goog.fx.easing.easeOut;
/**
* @return {boolean} Whether the zippy is in the process of being expanded or
* collapsed.
*/
goog.ui.AnimatedZippy.prototype.isBusy = function() {
return this.anim_ != null;
};
/**
* Sets expanded state.
*
* @param {boolean} expanded Expanded/visibility state.
* @override
*/
goog.ui.AnimatedZippy.prototype.setExpanded = function(expanded) {
if (this.isExpanded() == expanded && !this.anim_) {
return;
}
// Reset display property of wrapper to allow content element to be
// measured.
if (this.elWrapper_.style.display == 'none') {
this.elWrapper_.style.display = '';
}
// Measure content element.
var h = this.getContentElement().offsetHeight;
// Stop active animation (if any) and determine starting height.
var startH = 0;
if (this.anim_) {
goog.events.removeAll(this.anim_);
this.anim_.stop(false);
var marginTop = parseInt(this.getContentElement().style.marginTop, 10);
startH = h - Math.abs(marginTop);
} else {
startH = expanded ? 0 : h;
}
// Updates header class name after the animation has been stopped.
this.updateHeaderClassName(expanded);
// Set up expand/collapse animation.
this.anim_ = new goog.fx.Animation([0, startH],
[0, expanded ? h : 0],
this.animationDuration,
this.animationAcceleration);
var events = [goog.fx.Transition.EventType.BEGIN,
goog.fx.Animation.EventType.ANIMATE,
goog.fx.Transition.EventType.END];
goog.events.listen(this.anim_, events, this.onAnimate_, false, this);
goog.events.listen(this.anim_,
goog.fx.Transition.EventType.END,
goog.bind(this.onAnimationCompleted_, this, expanded));
// Start animation.
this.anim_.play(false);
};
/**
* Called during animation
*
* @param {goog.events.Event} e The event.
* @private
*/
goog.ui.AnimatedZippy.prototype.onAnimate_ = function(e) {
var contentElement = this.getContentElement();
var h = contentElement.offsetHeight;
contentElement.style.marginTop = (e.y - h) + 'px';
};
/**
* Called once the expand/collapse animation has completed.
*
* @param {boolean} expanded Expanded/visibility state.
* @private
*/
goog.ui.AnimatedZippy.prototype.onAnimationCompleted_ = function(expanded) {
// Fix wrong end position if the content has changed during the animation.
if (expanded) {
this.getContentElement().style.marginTop = '0';
}
goog.events.removeAll(this.anim_);
this.setExpandedInternal(expanded);
this.anim_ = null;
if (!expanded) {
this.elWrapper_.style.display = 'none';
}
// Fire toggle event.
this.dispatchEvent(new goog.ui.ZippyEvent(goog.ui.Zippy.Events.TOGGLE,
this, expanded));
};
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