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/* <copyright>
This file contains proprietary software owned by Motorola Mobility, Inc.<br/>
No rights, expressed or implied, whatsoever to this software are provided by Motorola Mobility, Inc. hereunder.<br/>
(c) Copyright 2011 Motorola Mobility, Inc. All Rights Reserved.
</copyright> */
var Montage = require("montage").Montage,
Component = require("ui/component").Component;
var isUndefined = function(obj) {
return (typeof obj === 'undefined');
};
/**
* Base component for all native controls.
*/
var NativeControl = exports.NativeControl = Montage.create(Component, {
hasTemplate: {
value: false
},
element: {
serializable: true,
enumerable: true,
get: function() {
return this._element;
},
set: function(value) {
//var component = Object.getPrototypeOf(NativeControl);
// call super set
Object.getPropertyDescriptor(Component, "element").set.call(this, value);
this.didSetElement();
}
},
/** Stores values that need to be set on the element. Cleared each draw
* cycle.
*/
_elementAttributeValues: {
value: {},
distinct: true
},
/** Stores the descriptors of the properties that can be set on this
* control
*/
_elementAttributeDescriptors: {
value: {},
distinct: true
},
_getElementAttributeDescriptor: {
value: function(attributeName) {
var attributeDescriptor, instance = this;
// walk up the prototype chain from the instance to NativeControl's prototype
while(instance && !isUndefined(instance._elementAttributeDescriptors)) {
attributeDescriptor = instance._elementAttributeDescriptors[attributeName];
if(attributeDescriptor) {
break;
} else {
instance = Object.getPrototypeOf(instance);
}
}
return attributeDescriptor;
}
},
/**
* Add a property to this Component. A default getter/setter is provided and a
* "_" property is created by default. Eg: if the property is "title", "_title" is
* automatically created and the value set to the value from the descriptor.
*/
defineAttribute: {
value: function(name, descriptor) {
descriptor = descriptor || {};
var newDescriptor = {
configurable: isUndefined(descriptor.configurable) ? true: descriptor.configurable,
enumerable: isUndefined(descriptor.enumerable) ? true: descriptor.enumerable,
serializable: isUndefined(descriptor.serializable) ? true: descriptor.serializable,
set: (function(name) {
return function(value) {
var attrName = '_' + name;
var desc = this._getElementAttributeDescriptor(name, this);
// if requested dataType is boolean (eg: checked, readonly etc)
// coerce the value to boolean
if(desc && "boolean" === desc.dataType) {
value = ( (value || value === "") ? true : false);
}
// If the set value is different to the current one,
// update it here, and set it to be updated on the
// element in the next draw cycle.
if(!isUndefined(value) && this[attrName] !== value) {
this[attrName] = value;
this._elementAttributeValues[name] = value;
this.needsDraw = true;
}
};
}(name)),
get: (function(name) {
return function() {
return this['_' + name];
};
}(name))
};
// Define _ property
Montage.defineProperty(this, '_' + name, {value: null});
// Define property getter and setter
Montage.defineProperty(this, name, newDescriptor);
}
},
/**
* Add the specified properties as properties of this Component
*/
addAttributes: {
value: function(properties) {
var i, descriptor, property, object;
this._elementAttributeDescriptors = properties;
for(property in properties) {
if(properties.hasOwnProperty(property)) {
object = properties[property];
// Make sure that the descriptor is of the correct form.
if(object === null || String.isString(object)) {
descriptor = {value: object, dataType: "string"};
properties[property] = descriptor;
} else {
descriptor = object;
}
// Only add the internal property, and getter and setter if
// they don't already exist.
if(isUndefined(this[property])) {
this.defineAttribute(property, descriptor);
}
}
}
}
},
didSetElement: {
value: function() {
// The element is now ready, so we can read the attributes that
// have been set on it.
var attributes = this.element.attributes || [];
var i=0, length = attributes.length, name, value, attributeName, descriptor, textContent;
for(i=0; i< length; i++) {
name = attributes[i].name;
value = attributes[i].value;
if(isUndefined(this._elementAttributeValues[name])) {
this._elementAttributeValues[name] = value;
if(isUndefined(this[name]) || this[name] == null) {
this[name] = value;
}
}
}
// check if this element has textContent
textContent = this.element.textContent;
// set textContent only if it is defined as part of element properties
if(('textContent' in this) && textContent && ("" !== textContent)) {
if(isUndefined(this._elementAttributeValues['textContent'])) {
this._elementAttributeValues['textContent'] = textContent;
if(isUndefined(this['textContent']) || this['textContent'] === null) {
this['textContent'] = textContent;
}
}
}
// Set defaults for any properties that weren't serialised or set
// as attributes on the element.
for (attributeName in this._elementAttributeDescriptors) {
descriptor = this._elementAttributeDescriptors[attributeName];
if (this["_"+attributeName] === null && descriptor !== null && "value" in descriptor) {
this["_"+attributeName] = this._elementAttributeDescriptors[attributeName].value;
}
}
}
},
draw: {
enumerable: false,
value: function() {
var element = this.element, descriptor;
for(var attributeName in this._elementAttributeValues) {
if(this._elementAttributeValues.hasOwnProperty(attributeName)) {
var value = this[attributeName];
descriptor = this._getElementAttributeDescriptor(attributeName, this);
if(descriptor && descriptor.dataType === 'boolean') {
if(value === true) {
element[attributeName] = true;
element.setAttribute(attributeName, attributeName.toLowerCase());
} else {
element[attributeName] = false;
element.removeAttribute(attributeName);
}
} else {
if(!isUndefined(value)) {
if(attributeName === 'textContent') {
element.textContent = value;
} else {
//https://developer.mozilla.org/en/DOM/element.setAttribute
element.setAttribute(attributeName, value);
}
}
}
}
}
// the values have been flushed to the DOM.
this._elementAttributeValues = {};
}
}
});
//http://www.w3.org/TR/html5/elements.html#global-attributes
NativeControl.addAttributes({
accesskey: null,
contenteditable: null, // true, false, inherit
contextmenu: null,
'class': null,
dir: null,
draggable: null,
dropzone: null, // copy/move/link
hidden: {dataType: 'boolean'},
//id: null,
lang: null,
spellcheck: null,
style: null,
tabindex: null,
title: null
});
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