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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> */
/*global require,exports */
var Montage = require("montage").Montage,
Component = require("ui/component").Component;
/**
* The input type="range" field
*/
var RangeInput = exports.RangeInput = Montage.create(Component, {
DEFAULT_WIDTH: {value: 300},
HANDLE_ADJUST: {value: 5},
hasTemplate: {value: true},
// public API
_min: {value: null},
min: {
get: function() {
return this._min;
},
set: function(value) {
this._min = String.isString(value) ? parseFloat(value) : value;
this.needsDraw = true;
}
},
_max: {value: null},
max: {
get: function() {
return this._max;
},
set: function(value) {
this._max = String.isString(value) ? parseFloat(value) : value;
this.needsDraw = true;
}
},
_step: {value: null},
step: {
get: function() {
return this._step;
},
set: function(value) {
this._step = String.isString(value) ? parseFloat(value) : value;
this.needsDraw = true;
}
},
/** Width of the slider in px. Default = 300 */
_width: {value: null},
width: {
get: function() {
return this._width;
},
set: function(value) {
this._width = String.isString(value) ? parseFloat(value) : value;
this.needsDraw = true;
}
},
percent: {value: null},
_valueSyncedWithPosition: {value: null},
_value: {value: null},
value: {
get: function() {
return this._value;
},
set: function(value, fromInput) {
this._value = String.isString(value) ? parseFloat(value) : value;
if(fromInput) {
this._valueSyncedWithPosition = true;
} else {
this._valueSyncedWithPosition = false;
this._calculatePositionFromValue();
this.needsDraw = true;
}
}
},
// private
_handleEl: {value: null, enumerable: false},
_sliderLeft: {value: null, enumerable: false},
_sliderWidth: {value: null, enumerable: false},
__positionX: {value: null},
_positionX: {
enumerable: false,
get: function() {
return this.__positionX;
},
set: function(value, fromValue) {
if(value !== null && !isNaN(value)) {
this.__positionX = value;
if(!fromValue) {
this._calculateValueFromPosition();
this._valueSyncedWithPosition = true;
}
this.needsDraw = true;
}
}
},
_calculateValueFromPosition: {
value: function() {
if(this._sliderWidth > 0) {
var percent = this.percent = (this._positionX / this._sliderWidth) * 100;
var value = (this.min + ((percent/100) * (this.max - this.min)));
Object.getPropertyDescriptor(this, "value").set.call(this, value, true);
}
}
},
_calculatePositionFromValue: {
value: function() {
// unless the element is ready, we cannot position the handle
if(this._sliderWidth) {
var percent, value = this.value;
var range = (this.max - this.min);
percent = ((this.value-this.min)/range) * 100;
var positionX = (percent/100)*this._sliderWidth;
Object.getPropertyDescriptor(this, "_positionX").set.call(this, positionX, true);
this.percent = percent;
this._valueSyncedWithPosition = true;
} else {
this._valueSyncedWithPosition = false;
}
}
},
deserializedFromTemplate: {
value: function() {
// read initial values from the input type=range
this.min = this.min || this.element.getAttribute('min') || 0;
this.max = this.max || this.element.getAttribute('max') || 100;
this.step = this.step || this.element.getAttribute('step') || 1;
this.value = this.value || this.element.getAttribute('value') || 0;
}
},
prepareForDraw: {
value: function() {
this._sliderLeft = this.element.offsetLeft;
this._sliderWidth = (this.width || RangeInput.DEFAULT_WIDTH); //this.element.offsetWidth || 300;
this.element.style.width = (this._sliderWidth + RangeInput.HANDLE_ADJUST) + 'px';
if(!this._valueSyncedWithPosition) {
this._calculatePositionFromValue();
}
}
},
// @todo: Without prepareForActivationEvents, the _translateComposer does not work
prepareForActivationEvents: {
value: function() {
this._translateComposer.addEventListener('translateStart', this, false);
this._translateComposer.addEventListener('translateEnd', this, false);
this._addEventListeners();
}
},
_addEventListeners: {
value: function() {
if(window.Touch) {
this.element.addEventListener('touchend', this, false);
} else {
this.element.addEventListener('mouseup', this, false);
}
}
},
_removeEventListeners: {
value: function() {
if(window.Touch) {
this.element.removeEventListener('touchend', this, false);
} else {
this.element.removeEventListener('mouseup', this, false);
}
}
},
handleTranslateStart: {
value: function(e) {
this._removeEventListeners();
this._valueSyncedWithPosition = false;
}
},
handleTranslateEnd: {
value: function(e) {
this._addEventListeners();
}
},
// handle user clicking the slider scale directly instead of moving the knob
_handleClick: {
value: function(position) {
var positionX = (position - (this._sliderLeft + 2*RangeInput.HANDLE_ADJUST));
if(positionX < 0) {
positionX = 0;
}
this._positionX = positionX;
}
},
handleMouseup: {
value: function(e) {
this._handleClick(e.clientX);
}
},
handleTouchend: {
value: function(event) {
this._handleClick(event.changedTouches[0].clientX);
}
},
surrenderPointer: {
value: function(pointer, composer) {
// If the user is sliding us then we do not want anyone using
// the pointer
return false;
}
},
draw: {
value: function() {
var el = this._handleEl;
if(el.style.webkitTransform != null) {
// detection for webkitTransform to use Hardware acceleration where available
el.style.webkitTransform = 'translate(' + this._positionX + 'px)';
} else if(el.style.MozTransform != null) {
el.style.MozTransform = 'translate(' + this._positionX + 'px)';
} else if(el.style.transform != null) {
el.style.transform = 'translate(' + this._positionX + 'px)';
} else {
// fallback
el.style['left'] = this._positionX + 'px';
}
}
}
});
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