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var Montage = require("montage").Montage,
Component = require("ui/component").Component
TranslateComposer = require("ui/composer/translate-composer").TranslateComposer;
exports.Scroller = Montage.create(Component, {
_scrollX: {
enumerable: false,
value: 0
},
scrollX: {
get: function () {
return this._scrollX;
},
set: function (value) {
this._scrollX = value;
this.needsDraw = true;
}
},
_scrollY: {
enumerable: false,
value: 0
},
scrollY: {
get: function () {
return this._scrollY;
},
set: function (value) {
this._scrollY = value;
this.needsDraw = true;
}
},
_maxTranslateX: {
value: 0
},
_maxTranslateY: {
value: 0
},
_axis: {
enumerable: false,
value: "auto"
},
axis: {
get: function () {
return this._axis;
},
set: function (value) {
this._axis = value;
this.needsDraw = true;
}
},
_displayScrollbars: {
enumerable: false,
value: "auto"
},
displayScrollbars: {
get: function () {
return this._displayScrollbars;
},
set: function (value) {
switch (value) {
case "vertical":
case "horizontal":
case "both":
case "auto":
this._displayScrollbars = value;
break;
default:
this._displayScrollbars = "none";
break;
}
this.needsDraw = true;
}
},
_hasMomentum: {
enumerable: false,
value: true
},
hasMomentum: {
get: function () {
return this._hasMomentum;
},
set: function (value) {
this._hasMomentum = value;
}
},
_hasBouncing: {
enumerable: false,
value: true
},
hasBouncing: {
get: function () {
return this._hasBouncing;
},
set: function (value) {
this._hasBouncing = value;
}
},
_momentumDuration: {
enumerable: false,
value: 650
},
momentumDuration: {
get: function () {
return this._momentumDuration;
},
set: function (value) {
this._momentumDuration = value;
}
},
_bouncingDuration: {
enumerable: false,
value: 750
},
bouncingDuration: {
get: function () {
return this._bouncingDuration;
},
set: function (value) {
this._bouncingDuration = value;
}
},
_content: {
enumerable: false,
value: null
},
templateDidLoad: {
value: function () {
var orphanedFragment,
currentContentRange = this.element.ownerDocument.createRange();
currentContentRange.selectNodeContents(this.element);
orphanedFragment = currentContentRange.extractContents();
this._content.appendChild(orphanedFragment);
}
},
handleTranslateStart: {
value: function(event) {
this._scrollBars.opacity = .5;
}
},
handleTranslateEnd: {
value: function(event) {
this._scrollBars.opacity = 0;
}
},
willDraw: {
enumerable: false,
value: function () {
this._left = this._element.offsetLeft;
this._top = this._element.offsetTop;
this._width = this._element.offsetWidth;
this._height = this._element.offsetHeight;
this._maxTranslateX = this._content.scrollWidth - this._width;
if (this._maxTranslateX < 0) {
this._.maxTranslateX = 0;
}
this._maxTranslateY = this._content.offsetHeight - this._height;
if (this._maxTranslateY < 0) {
this._maxTranslateY = 0;
}
var delegateValue = this.callDelegateMethod("didSetMaxScroll", {x: this._maxTranslateX, y: this._maxTranslateY});
if (delegateValue) {
this._maxTranslateX = delegateValue.x;
this._maxTranslateY = delegateValue.y;
}
switch (this._displayScrollbars) {
case "horizontal":
this._scrollBars.displayHorizontal = true;
this._scrollBars.displayVertical = false;
break;
case "vertical":
this._scrollBars.displayHorizontal = false;
this._scrollBars.displayVertical = true;
break;
case "both":
this._scrollBars.displayHorizontal = true;
this._scrollBars.displayVertical = true;
break;
case "auto":
if (this._maxTranslateX && this._maxTranslateY) {
this._scrollBars.displayHorizontal = true;
this._scrollBars.displayVertical = true;
} else {
if (this._maxTranslateX) {
this._scrollBars.displayHorizontal = true;
this._scrollBars.displayVertical = false;
} else {
if (this._maxTranslateY) {
this._scrollBars.displayHorizontal = false;
this._scrollBars.displayVertical = true;
} else {
this._scrollBars.displayHorizontal = false;
this._scrollBars.displayVertical = false;
}
}
}
break;
case "none":
this._scrollBars.displayHorizontal = false;
this._scrollBars.displayVertical = false;
break;
}
if (this._scrollBars.displayHorizontal) {
if (this._content.scrollWidth) {
this._scrollBars.horizontalLength = this._width / this._content.scrollWidth;
this._scrollBars.horizontalScroll = this._scrollX / this._content.scrollWidth;
} else {
this._scrollBars.horizontalLength = 1;
this._scrollBars.horizontalScroll = 0;
}
}
if (this._scrollBars.displayVertical) {
if (this._content.offsetHeight) {
this._scrollBars.verticalLength = this._height / this._content.offsetHeight;
this._scrollBars.verticalScroll = this._scrollY / this._content.offsetHeight;
} else {
this._scrollBars.verticalLength = 1;
this._scrollBars.verticalScroll = 0;
}
}
}
},
draw: {
enumerable: false,
value: function () {
this._content.style.webkitTransform="translate3d("+(-this._scrollX)+"px, "+(-this._scrollY)+"px, 0)";
}
}
});
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