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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 simple, sample component.
*
*/
goog.provide('goog.demos.SampleComponent');
goog.require('goog.dom');
goog.require('goog.dom.classes');
goog.require('goog.events.EventHandler');
goog.require('goog.events.EventType');
goog.require('goog.events.KeyCodes');
goog.require('goog.events.KeyHandler');
goog.require('goog.events.KeyHandler.EventType');
goog.require('goog.ui.Component');
/**
* A simple box that changes colour when clicked. This class demonstrates the
* goog.ui.Component API, and is keyboard accessible, as per
* http://wiki/Main/ClosureKeyboardAccessible
*
* @param {string=} opt_label A label to display. Defaults to "Click Me" if none
* provided.
* @param {goog.dom.DomHelper=} opt_domHelper DOM helper to use.
*
* @extends {goog.ui.Component}
* @constructor
*/
goog.demos.SampleComponent = function(opt_label, opt_domHelper) {
goog.ui.Component.call(this, opt_domHelper);
/**
* The label to display.
* @type {string}
* @private
*/
this.initialLabel_ = opt_label || 'Click Me';
/**
* The current color.
* @type {string}
* @private
*/
this.color_ = 'red';
/**
* Event handler for this object.
* @type {goog.events.EventHandler}
* @private
*/
this.eh_ = new goog.events.EventHandler(this);
/**
* Keyboard handler for this object. This object is created once the
* component's DOM element is known.
*
* @type {goog.events.KeyHandler?}
* @private
*/
this.kh_ = null;
};
goog.inherits(goog.demos.SampleComponent, goog.ui.Component);
/**
* Changes the color of the element.
* @private
*/
goog.demos.SampleComponent.prototype.changeColor_ = function() {
if (this.color_ == 'red') {
this.color_ = 'green';
} else if (this.color_ == 'green') {
this.color_ = 'blue';
} else {
this.color_ = 'red';
}
this.getElement().style.backgroundColor = this.color_;
};
/**
* Creates an initial DOM representation for the component.
*/
goog.demos.SampleComponent.prototype.createDom = function() {
this.decorateInternal(this.dom_.createElement('div'));
};
/**
* Decorates an existing HTML DIV element as a SampleComponent.
*
* @param {Element} element The DIV element to decorate. The element's
* text, if any will be used as the component's label.
*/
goog.demos.SampleComponent.prototype.decorateInternal = function(element) {
goog.demos.SampleComponent.superClass_.decorateInternal.call(this, element);
if (!this.getLabelText()) {
this.setLabelText(this.initialLabel_);
}
var elem = this.getElement();
goog.dom.classes.add(elem, goog.getCssName('goog-sample-component'));
elem.style.backgroundColor = this.color_;
elem.tabIndex = 0;
this.kh_ = new goog.events.KeyHandler(elem);
this.eh_.listen(this.kh_, goog.events.KeyHandler.EventType.KEY, this.onKey_);
};
/** @override */
goog.demos.SampleComponent.prototype.disposeInternal = function() {
goog.demos.SampleComponent.superClass_.disposeInternal.call(this);
this.eh_.dispose();
if (this.kh_) {
this.kh_.dispose();
}
};
/**
* Called when component's element is known to be in the document.
*/
goog.demos.SampleComponent.prototype.enterDocument = function() {
goog.demos.SampleComponent.superClass_.enterDocument.call(this);
this.eh_.listen(this.getElement(), goog.events.EventType.CLICK,
this.onDivClicked_);
};
/**
* Called when component's element is known to have been removed from the
* document.
*/
goog.demos.SampleComponent.prototype.exitDocument = function() {
goog.demos.SampleComponent.superClass_.exitDocument.call(this);
this.eh_.unlisten(this.getElement(), goog.events.EventType.CLICK,
this.onDivClicked_);
};
/**
* Gets the current label text.
*
* @return {string} The current text set into the label, or empty string if
* none set.
*/
goog.demos.SampleComponent.prototype.getLabelText = function() {
if (!this.getElement()) {
return '';
}
return goog.dom.getTextContent(this.getElement());
};
/**
* Handles DIV element clicks, causing the DIV's colour to change.
* @param {goog.events.Event} event The click event.
* @private
*/
goog.demos.SampleComponent.prototype.onDivClicked_ = function(event) {
this.changeColor_();
};
/**
* Fired when user presses a key while the DIV has focus. If the user presses
* space or enter, the color will be changed.
* @param {goog.events.Event} event The key event.
* @private
*/
goog.demos.SampleComponent.prototype.onKey_ = function(event) {
var keyCodes = goog.events.KeyCodes;
if (event.keyCode == keyCodes.SPACE || event.keyCode == keyCodes.ENTER) {
this.changeColor_();
}
};
/**
* Sets the current label text. Has no effect if component is not rendered.
*
* @param {string} text The text to set as the label.
*/
goog.demos.SampleComponent.prototype.setLabelText = function(text) {
if (this.getElement()) {
goog.dom.setTextContent(this.getElement(), text);
}
};
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