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var Montage = require("montage").Montage,
Component = require("ui/component").Component;
var ScrollBars = exports.ScrollBars = Montage.create(Component, {
// Scroll and length are defined in a [0..1] range
_verticalScroll: {
enumerable: false,
value: 0
},
_horizontalScroll: {
enumerable: false,
value: 0
},
_verticalLength: {
enumerable: false,
value: 0
},
_horizontalLength: {
enumerable: false,
value: 0
},
verticalScroll: {
get: function () {
return this._verticalScroll;
},
set: function (value) {
this._verticalScroll = value;
this.needsDraw = true;
}
},
horizontalScroll: {
get: function () {
return this._horizontalScroll;
},
set: function (value) {
this._horizontalScroll = value;
this.needsDraw = true;
}
},
verticalLength: {
get: function () {
return this._verticalLength;
},
set: function (value) {
this._verticalLength = value;
this.needsDraw = true;
}
},
horizontalLength: {
get: function () {
return this._horizontalLength;
},
set: function (value) {
this._horizontalLength = value;
this.needsDraw = true;
}
},
_opacity: {
enumerable: false,
value: 0
},
opacity: {
get: function () {
return this._opacity;
},
set: function (value) {
this._opacity = value;
this.needsDraw = true;
}
},
_isDisplayUpdated: {
enumerable: false,
value: false
},
_displayVertical: {
enumerable: false,
value: false
},
displayVertical: {
get: function () {
return this._displayVertical;
},
set: function (value) {
if (this._displayVertical !== value) {
this._displayVertical = value;
this._isDisplayUpdated = true;
this.needsDraw = true;
}
}
},
_displayHorizontal: {
enumerable: false,
value: false
},
displayHorizontal: {
get: function () {
return this._displayHorizontal;
},
set: function (value) {
if (this._displayHorizontal !== value) {
this._displayHorizontal = value;
this._isDisplayUpdated = true;
this.needsDraw = true;
}
}
},
_hasResizedHorizontal: {
enumerable: false,
value: false
},
_hasResizedVertical: {
enumerable: false,
value: false
},
willDraw: {
value: function () {
if (this._offsetWidth !== this._element.offsetWidth) {
this._offsetWidth = this._element.offsetWidth;
this._hasResizedHorizontal = true;
}
if (this._offsetHeight !== this._element.offsetHeight) {
this._offsetHeight = this._element.offsetHeight;
this._hasResizedVertical = true;
}
}
},
draw: {
value: function () {
var size,
pos,
range,
max;
if (this._isDisplayUpdated) {
var displayVertical = this._displayVertical ? "block" : "none",
displayHorizontal = this._displayHorizontal ? "block" : "none";
this._top.style.display = this._bottomClip.style.display = displayVertical;
this._left.style.display = this._rightClip.style.display = displayHorizontal;
this._isDisplayUpdated = false;
}
if (this._hasResizedHorizontal && this._displayHorizontal) {
this._rightClip.style.width = this._right.style.width = (this._offsetWidth - 4) + "px";
this._rightClip.style.clip = "rect(-1px," + (this._offsetWidth - 3) + "px,6px,3px)";
this._hasResizedHorizontal = false;
}
if (this._hasResizedVertical && this._displayVertical) {
this._bottomClip.style.height = this._bottom.style.height = (this._offsetHeight - 4) + "px";
this._bottomClip.style.clip = "rect(3px,6px," + (this._offsetHeight - 3) + "px,-1px)";
this._hasResizedVertical = false;
}
if (this._opacity) {
if (this._displayHorizontal) {
range = this._offsetWidth - 9 - (this._displayVertical ? 6 : 0);
size = Math.floor(range * this._horizontalLength);
max = range - size;
if (1 - this._horizontalLength) {
pos = Math.floor((max * this._horizontalScroll) / (1 - this._horizontalLength));
} else {
pos = 0;
}
if (pos < 0) {
size += pos;
if (size < 0) {
size = 0;
}
pos = 0;
}
if (pos > max) {
size += Math.floor(max - pos);
if (size < 0) {
size = 0;
}
pos = range - size;
}
this._right.style.webkitTransform = "translate3d(" + (size - this._offsetWidth + 9) + "px,0,0)";
this._left.style.webkitTransform = this._rightClip.style.webkitTransform = "translate3d(" + (pos+2) + "px,0,0)";
this._left.style.webkitTransition = this._right.style.webkitTransition = "none";
this._left.style.opacity = this._right.style.opacity = this._opacity;
}
if (this._displayVertical) {
range = this._offsetHeight - 9 - (this._displayHorizontal ? 6 : 0);
size = Math.floor(range * this._verticalLength);
max = range - size;
if (1 - this._verticalLength) {
pos = Math.floor((max * this._verticalScroll) / (1 - this._verticalLength));
} else {
pos = 0;
}
if (pos < 0) {
size += pos;
if (size < 0) {
size = 0;
}
pos = 0;
}
if (pos > max) {
size += Math.floor(max - pos);
if (size < 0) {
size = 0;
}
pos = range - size;
}
this._bottom.style.webkitTransform = "translate3d(0," + (size - this._offsetHeight + 9) + "px,0)";
this._top.style.webkitTransform = this._bottomClip.style.webkitTransform = "translate3d(0," + (pos+2) + "px,0)";
this._top.style.webkitTransition = this._bottom.style.webkitTransition = "none";
this._top.style.opacity = this._bottom.style.opacity = this._opacity;
}
} else {
if (this._displayHorizontal) {
this._left.style.webkitTransition = this._right.style.webkitTransition = "300ms opacity";
this._left.style.opacity = this._right.style.opacity = 0;
}
if (this._displayVertical) {
this._top.style.webkitTransition = this._bottom.style.webkitTransition = "300ms opacity";
this._top.style.opacity = this._bottom.style.opacity = 0;
}
}
}
}
});
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