/**
*
* @module progressbar
* @requires yahoo, dom, event, element
* @optional animation
* @title ProgressBar Widget
*/
(function () {
var Dom = YAHOO.util.Dom,
Lang = YAHOO.lang,
// ClassNames
CLASS_PROGBAR = 'yui-pb',
CLASS_MASK = CLASS_PROGBAR + '-mask',
CLASS_BAR = CLASS_PROGBAR + '-bar',
CLASS_ANIM = CLASS_PROGBAR + '-anim',
CLASS_TL = CLASS_PROGBAR + '-tl',
CLASS_TR = CLASS_PROGBAR + '-tr',
CLASS_BL = CLASS_PROGBAR + '-bl',
CLASS_BR = CLASS_PROGBAR + '-br',
// Configuration attributes
WIDTH = 'width',
HEIGHT = 'height',
MIN_VALUE = 'minValue',
MAX_VALUE = 'maxValue',
VALUE = 'value',
ANIM = 'anim',
DIRECTION = 'direction',
DIRECTION_LTR = 'ltr',
DIRECTION_RTL = 'rtl',
DIRECTION_TTB = 'ttb',
DIRECTION_BTT = 'btt',
BAR_EL = 'barEl',
MASK_EL = 'maskEl',
ARIA_TEXT_TEMPLATE = 'ariaTextTemplate',
// Events
START = 'start',
PROGRESS = 'progress',
COMPLETE = 'complete';
/**
* The ProgressBar widget provides an easy way to draw a bar depicting progress of an operation,
* a level meter, rating or any such simple linear measure.
* It allows for highly customized styles including animation, vertical or horizontal and forward or reverse.
* @namespace YAHOO.widget
* @class ProgressBar
* @extends YAHOO.util.Element
* @param oConfigs {object} An object containing any configuration attributes to be set
* @constructor
*/
var Prog = function(oConfigs) {
YAHOO.log('Creating ProgressBar instance','info','ProgressBar');
Prog.superclass.constructor.call(this, document.createElement('div') , oConfigs);
this._init(oConfigs);
};
YAHOO.widget.ProgressBar = Prog;
/**
* String containing the HTML string which is the basis for the Progress Bar.
*
* @property ProgressBar.MARKUP
* @type String
* @static
* @final
* @default (too long)
*/
Prog.MARKUP = [
'<div class="',
CLASS_BAR,
'"></div><div class="',
CLASS_MASK,
'"><div class="',
CLASS_TL,
'"></div><div class="',
CLASS_TR,
'"></div><div class="',
CLASS_BL,
'"></div><div class="',
CLASS_BR,
'"></div></div>'
].join('');
Lang.extend(Prog, YAHOO.util.Element, {
/**
* Initialization code for the widget, separate from the constructor to allow for overriding/patching.
* It is called after <a href="#method_initAttributes">initAttributes</a>
*
* @method _init
* @param oConfigs {Object} (Optional) Object literal definition of configuration values.
* @protected
*/
_init: function (oConfigs) {
/**
* Fires when the value is about to change. It reports the starting value
* @event start
* @type CustomEvent
* @param value {Number} the current (initial) value
*/
// No actual creation required, event will be created when subscribed to
//this.createEvent(START);
/**
* If animation is active, it will trigger several times during the animation providing intermediate values
* If animation is not active, it will fire only once providing the end value
* @event progress
* @type CustomEvent
* @param value{Number} the current, changing value
*/
// No actual creation required, event will be created when subscribed to
//this.createEvent(PROGRESS);
/**
* Fires at the end of the animation or immediately upon changing values if animation is not loaded
* @event complete
* @type CustomEvent
* @param value {Number} the current (final) value
*/
// No actual creation required, event will be created when listened to
//this.createEvent(COMPLETE);
},
/**
* Implementation of Element's abstract method. Sets up config values.
*
* @method initAttributes
* @param oConfigs {Object} (Optional) Object literal definition of configuration values.
* @private
*/
initAttributes: function (oConfigs) {
YAHOO.log('Initializing configuration attributes','info','ProgressBar');
Prog.superclass.initAttributes.call(this, oConfigs);
this.set('innerHTML',Prog.MARKUP);
this.addClass(CLASS_PROGBAR);
// I need to apply at least the following styles, if present in oConfigs,
// to the ProgressBar so when it later reads the width and height,
// they are already set to the correct values.
// id is important because it can be used as a CSS selector.
var key, presets = ['id',WIDTH,HEIGHT,'class','style'];
while((key = presets.pop())) {
if (key in oConfigs) {
this.set(key,oConfigs[key]);
}
}
/**
* @attribute barEl
* @description Reference to the HTML object that makes the moving bar (read-only)
* @type HTMLElement (div)
* @readonly
*/
this.setAttributeConfig(BAR_EL, {
readOnly: true,
value: this.getElementsByClassName(CLASS_BAR)[0]
});
/**
* @attribute maskEl
* @description Reference to the HTML object that overlays the bar providing the mask. (read-only)
* @type HTMLElement (table)
* @readonly
*/
this.setAttributeConfig(MASK_EL, {
readOnly: true,
value: this.getElementsByClassName(CLASS_MASK)[0]
});
/**
* @attribute direction
* @description Direction of movement of the bar.
* It can be any of 'ltr' (left to right), 'rtl' (the reverse) , 'ttb' (top to bottom) or 'btt'.
* Can only be set once and only before rendering.
* @default 'ltr'
* @type String (any of "ltr", "rtl", "ttb" or "btt")
*/
this.setAttributeConfig(DIRECTION, {
value:DIRECTION_LTR,
validator:function(value) {
if (this._rendered) { return false; }
switch (value) {
case DIRECTION_LTR:
case DIRECTION_RTL:
case DIRECTION_TTB:
case DIRECTION_BTT:
return true;
default:
return false;
}
},
method: function(value) {
this._barSizeFunction = this._barSizeFunctions[this.get(ANIM)?1:0][value];
}
});
/**
* @attribute maxValue
* @description Represents the top value for the bar.
* The bar will be fully extended when reaching this value.
* Values higher than this will be ignored.
* @default 100
* @type Number
*/
this.setAttributeConfig(MAX_VALUE, {
value: 100,
validator: Lang.isNumber,
method: function (value) {
this.get('element').setAttribute('aria-valuemax',value);
if (this.get(VALUE) > value) { this.set(VALUE,value); }
}
});
/**
* @attribute minValue
* @description Represents the lowest value for the bar.
* The bar will be totally collapsed when reaching this value.
* Values lower than this will be ignored.
* @default 0
* @type Number
*/
this.setAttributeConfig(MIN_VALUE, {
value: 0,
validator: Lang.isNumber,
method: function (value) {
this.get('element').setAttribute('aria-valuemin',value);
if (this.get(VALUE) < value) { this.set(VALUE,value); }
}
});
/**
* @attribute width
* @description Width of the ProgressBar.
* If a number, it will be assumed to be in pixels.
* If a string it should be a valid setting for the CSS width attribute.
* It will always be returned as a string including units.
* @default "200px"
* @type Number or String
*/
this.setAttributeConfig(WIDTH, {
getter: function() {
return this.getStyle(WIDTH);
},
method: this._widthChange
});
/**
* @attribute height
* @description Height of the ProgressBar.
* If a number, it will be assumed to be in pixels.
* If a string it should be a valid setting for the CSS height attribute.
* It will always be returned as a string including units.
* @default "20px"
* @type Number or String
*/
this.setAttributeConfig(HEIGHT, {
getter:function() {
return this.getStyle(HEIGHT);
},
method: this._heightChange
});
/**
* @attribute ariaTextTemplate
* @description Text to be voiced by screen readers.
* The text is processed by <a href="YAHOO.lang.html#method_substitute">YAHOO.lang.substitute</a>.
* It can use the placeholders {value}, {minValue} and {maxValue}
* @default "{value}"
* @type String
*/
this.setAttributeConfig(ARIA_TEXT_TEMPLATE, {
value:'{value}'
});
/**
* @attribute value
* @description The value for the bar.
* Valid values are in between the minValue and maxValue attributes.
* @default 0
* @type Number
*/
this.setAttributeConfig(VALUE, {
value: 0,
validator: function(value) {
return Lang.isNumber(value) && value >= this.get(MIN_VALUE) && value <= this.get(MAX_VALUE);
},
method: this._valueChange
});
/**
* @attribute anim
* @description it accepts either a boolean (recommended) or an instance of <a href="YAHOO.util.Anim.html">YAHOO.util.Anim</a>.
* If a boolean, it will enable/disable animation creating its own instance of the animation utility.
* If given an instance of <a href="YAHOO.util.Anim.html">YAHOO.util.Anim</a> it will use that instance.
* The <a href="YAHOO.util.Anim.html">animation</a> utility needs to be loaded.
* When read, it returns the instance of the animation utility in use or null if none.
* It can be used to set the animation parameters such as easing methods or duration.
* @default null
* @type {boolean} or {instance of YAHOO.util.Anim}
*/
this.setAttributeConfig(ANIM, {
validator: function(value) {
return !!YAHOO.util.Anim;
},
setter: this._animSetter
});
},
/**
* Renders the ProgressBar into the given container.
* If the container has other content, the ProgressBar will be appended to it.
* If the second argument is provided, the ProgressBar will be inserted before the given child.
* The method is chainable since it returns a reference to this instance.
* @method render
* @param el {HTML Element} HTML element that will contain the ProgressBar
* @param before {HTML Element} (optional) If present, the ProgressBar will be inserted before this element.
* @return {YAHOO.widget.ProgressBar}
* @chainable
*/
render: function(parent,before) {
YAHOO.log('start render','info','ProgressBar');
if (this._rendered) { return; }
this._rendered = true;
var direction = this.get(DIRECTION);
// If the developer set a className attribute on initialization,
// Element would have wiped out my own classNames
// So I need to insist on them, plus add the one for direction.
this.addClass(CLASS_PROGBAR);
this.addClass(CLASS_PROGBAR + '-' + direction);
var container = this.get('element');
container.tabIndex = 0;
container.setAttribute('role','progressbar');
container.setAttribute('aria-valuemin',this.get(MIN_VALUE));
container.setAttribute('aria-valuemax',this.get(MAX_VALUE));
this.appendTo(parent,before);
// I need to use the non-animated bar resizing function for initial redraw
this._barSizeFunction = this._barSizeFunctions[0][direction];
this.redraw();
this._previousValue = this.get(VALUE);
this._fixEdges();
// I can now set the correct bar resizer
if (this.get(ANIM)) {
this._barSizeFunction = this._barSizeFunctions[1][direction];
}
this.on('minValueChange',this.redraw);
this.on('maxValueChange',this.redraw);
return this;
},
/**
* Recalculates the bar size and position and redraws it
* @method redraw
* @return void
*/
redraw: function () {
YAHOO.log('Redraw','info','ProgressBar');
this._recalculateConstants();
this._valueChange(this.get(VALUE));
},
/**
* Destroys the ProgressBar, related objects and unsubscribes from all events
* @method destroy
* @return void
*/
destroy: function() {
YAHOO.log('destroy','info','ProgressBar');
this.set(ANIM,false);
this.unsubscribeAll();
var el = this.get('element');
if (el.parentNode) { el.parentNode.removeChild(el); }
},
/**
* The previous value setting for the bar. Used mostly as information to event listeners
* @property _previousValue
* @type Number
* @private
* @default 0
*/
_previousValue:0,
/**
* The actual space (in pixels) available for the bar within the mask (excludes margins)
* @property _barSpace
* @type Number
* @private
* @default 100
*/
_barSpace:100,
/**
* The factor to convert the actual value of the bar into pixels
* @property _barSpace
* @type Number
* @private
* @default 1
*/
_barFactor:1,
/**
* A flag to signal that rendering has already happened
* @property _rendered
* @type boolean
* @private
* @default false
*/
_rendered:false,
/**
* Function to be used to calculate bar size.
* It is picked from <a href="#property_barSizeFunctions">_barSizeFunctions</a>
* depending on direction and whether animation is active.
* @property _barSizeFunction
* @type {function}
* @default null
* @private
*/
_barSizeFunction: null,
/**
* Method called when the height attribute is changed
* @method _heightChange
* @param {int or string} value New height, in pixels if int or string including units
* @return void
* @private
*/
_heightChange: function(value) {
if (Lang.isNumber(value)) {
value += 'px';
}
this.setStyle(HEIGHT,value);
this._fixEdges();
this.redraw();
},
/**
* Method called when the height attribute is changed
* @method _widthChange
* @param {int or string} value New width, in pixels if int or string including units
* @return void
* @private
*/
_widthChange: function(value) {
if (Lang.isNumber(value)) {
value += 'px';
}
this.setStyle(WIDTH,value);
this._fixEdges();
this.redraw();
},
/**
* Due to rounding differences, some browsers fail to cover the whole area
* with the mask quadrants when the width or height is odd. This method
* stretches the lower and/or right quadrants to make the difference.
* @method _fixEdges
* @return void
* @private
*/
_fixEdges:function() {
if (!this._rendered || YAHOO.env.ua.ie || YAHOO.env.ua.gecko ) { return; }
var maskEl = this.get(MASK_EL),
tlEl = Dom.getElementsByClassName(CLASS_TL,undefined,maskEl)[0],
trEl = Dom.getElementsByClassName(CLASS_TR,undefined,maskEl)[0],
blEl = Dom.getElementsByClassName(CLASS_BL,undefined,maskEl)[0],
brEl = Dom.getElementsByClassName(CLASS_BR,undefined,maskEl)[0],
newSize = (parseInt(Dom.getStyle(maskEl,HEIGHT),10) -
parseInt(Dom.getStyle(tlEl,HEIGHT),10)) + 'px';
Dom.setStyle(blEl,HEIGHT,newSize);
Dom.setStyle(brEl,HEIGHT,newSize);
newSize = (parseInt(Dom.getStyle(maskEl,WIDTH),10) -
parseInt(Dom.getStyle(tlEl,WIDTH),10)) + 'px';
Dom.setStyle(trEl,WIDTH,newSize);
Dom.setStyle(brEl,WIDTH,newSize);
},
/**
* Calculates some auxiliary values to make the rendering faster
* @method _recalculateConstants
* @return void
* @private
*/
_recalculateConstants: function() {
YAHOO.log('Recalculating auxiliary factors','info','ProgressBar');
var barEl = this.get(BAR_EL);
switch (this.get(DIRECTION)) {
case DIRECTION_LTR:
case DIRECTION_RTL:
this._barSpace = parseInt(this.get(WIDTH),10) -
(parseInt(Dom.getStyle(barEl,'marginLeft'),10) || 0) -
(parseInt(Dom.getStyle(barEl,'marginRight'),10) || 0);
break;
case DIRECTION_TTB:
case DIRECTION_BTT:
this._barSpace = parseInt(this.get(HEIGHT),10) -
(parseInt(Dom.getStyle(barEl,'marginTop'),10) || 0)-
(parseInt(Dom.getStyle(barEl,'marginBottom'),10) || 0);
break;
}
this._barFactor = this._barSpace / (this.get(MAX_VALUE) - (this.get(MIN_VALUE) || 0)) || 1;
},
/**
* Called in response to a change in the <a href="#config_anim">anim</a> attribute.
* It creates and sets up or destroys the instance of the animation utility that will move the bar
* @method _animSetter
* @return void
* @private
*/
_animSetter: function (value) {
var anim, barEl = this.get(BAR_EL);
if (value) {
YAHOO.log('Turning animation on','info','ProgressBar');
if (value instanceof YAHOO.util.Anim) {
anim = value;
} else {
anim = new YAHOO.util.Anim(barEl);
}
anim.onTween.subscribe(this._animOnTween,this,true);
anim.onComplete.subscribe(this._animComplete,this,true);
// Temporary solution until http://yuilibrary.com/projects/yui2/ticket/2528222 gets solved:
var oldSetAttribute = anim.setAttribute,
pb = this;
switch(this.get(DIRECTION)) {
case DIRECTION_BTT:
anim.setAttribute = function(attr , val , unit) {
val = Math.round(val);
oldSetAttribute.call(this,attr,val,unit);
Dom.setStyle(barEl,'top',(pb._barSpace - val) + 'px');
};
break;
case DIRECTION_RTL:
anim.setAttribute = function(attr , val , unit) {
val = Math.round(val);
oldSetAttribute.call(this,attr,val,unit);
Dom.setStyle(barEl,'left',(pb._barSpace - val) + 'px');
};
break;
}
// up to here
} else {
YAHOO.log('Turning animation off','info','ProgressBar');
anim = this.get(ANIM);
if (anim) {
anim.onTween.unsubscribeAll();
anim.onComplete.unsubscribeAll();
}
anim = null;
}
this._barSizeFunction = this._barSizeFunctions[anim?1:0][this.get(DIRECTION)];
return anim;
},
_animComplete: function() {
YAHOO.log('Animation completed','info','ProgressBar');
var value = this.get(VALUE);
this._previousValue = value;
this.fireEvent(PROGRESS,value);
this.fireEvent(COMPLETE, value);
Dom.removeClass(this.get(BAR_EL),CLASS_ANIM);
},
_animOnTween:function (name,oArgs) {
var value = Math.floor(this._tweenFactor * oArgs[0].currentFrame + this._previousValue);
// The following fills the logger window too fast
//YAHOO.log('Animation onTween at: ' + value,'info','ProgressBar');
this.fireEvent(PROGRESS,value);
},
/**
* Called in response to a change in the <a href="#config_value">value</a> attribute.
* Moves the bar to reflect the new value
* @method _valueChange
* @return void
* @private
*/
_valueChange: function (value) {
YAHOO.log('set value: ' + value,'info','ProgressBar');
var anim = this.get(ANIM),
pixelValue = Math.floor((value - this.get(MIN_VALUE)) * this._barFactor),
barEl = this.get(BAR_EL);
this._setAriaText(value);
if (this._rendered) {
if (anim) {
anim.stop();
if (anim.isAnimated()) { anim._onComplete.fire(); } // see: http://yuilibrary.com/projects/yui2/ticket/2528217
}
this.fireEvent(START,this._previousValue);
this._barSizeFunction(value, pixelValue, barEl, anim);
}
},
/**
* Utility method to set the ARIA value attributes
* @method _setAriaText
* @return void
* @private
*/
_setAriaText: function(value) {
// When animated, this fills the logger window too fast
//YAHOO.log('Show template','info','ProgressBar');
var container = this.get('element'),
text = Lang.substitute(this.get(ARIA_TEXT_TEMPLATE),{
value:value,
minValue:this.get(MIN_VALUE),
maxValue:this.get(MAX_VALUE)
});
container.setAttribute('aria-valuenow',value);
container.setAttribute('aria-valuetext',text);
}
});
/**
* Collection of functions used by to calculate the size of the bar.
* One of this will be used depending on direction and whether animation is active.
* @property _barSizeFunctions
* @type {collection of functions}
* @private
*/
var b = [{},{}];
Prog.prototype._barSizeFunctions = b;
b[0][DIRECTION_LTR] = function(value, pixelValue, barEl, anim) {
Dom.setStyle(barEl,WIDTH, pixelValue + 'px');
this.fireEvent(PROGRESS,value);
this.fireEvent(COMPLETE,value);
};
b[0][DIRECTION_RTL] = function(value, pixelValue, barEl, anim) {
Dom.setStyle(barEl,WIDTH, pixelValue + 'px');
Dom.setStyle(barEl,'left',(this._barSpace - pixelValue) + 'px');
this.fireEvent(PROGRESS,value);
this.fireEvent(COMPLETE,value);
};
b[0][DIRECTION_TTB] = function(value, pixelValue, barEl, anim) {
Dom.setStyle(barEl,HEIGHT, pixelValue + 'px');
this.fireEvent(PROGRESS,value);
this.fireEvent(COMPLETE,value);
};
b[0][DIRECTION_BTT] = function(value, pixelValue, barEl, anim) {
Dom.setStyle(barEl,HEIGHT, pixelValue + 'px');
Dom.setStyle(barEl,'top', (this._barSpace - pixelValue) + 'px');
this.fireEvent(PROGRESS,value);
this.fireEvent(COMPLETE,value);
};
b[1][DIRECTION_LTR] = function(value, pixelValue, barEl, anim) {
Dom.addClass(barEl,CLASS_ANIM);
this._tweenFactor = (value - this._previousValue) / anim.totalFrames / anim.duration;
anim.attributes = {width:{ to: pixelValue }};
anim.animate();
};
b[1][DIRECTION_RTL] = b[1][DIRECTION_LTR];
b[1][DIRECTION_TTB] = function(value, pixelValue, barEl, anim) {
Dom.addClass(barEl,CLASS_ANIM);
this._tweenFactor = (value - this._previousValue) / anim.totalFrames / anim.duration;
anim.attributes = {height:{to: pixelValue}};
anim.animate();
};
b[1][DIRECTION_BTT] = b[1][DIRECTION_TTB];
})();