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bklynflow.js
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bklynflow.js
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// chk is gone as of Mootools 1.3, but this makes it still work ~ .dh
window.$chk = function(obj){
return !!(obj || obj === 0);
};
var BklynFlow = new Class({
initialize: function(thumbs, parentId) {
// Sensible defaults
this.frameClass = 'flow-frame';
this.imageClass = 'flow-image';
this.cellClass = 'flow-cell';
this.rotationValue = '30deg';
this.zOffset = '-100px';
this.transitionTime = '400ms';
// When set to false, tapping a deselected cell will center that cell
// but will not trigger its action. When true, tapping any cell will
// both center the cell and trigger its action.
this.tapToSelectTriggersAction = true;
// Get MooTools recognizing touch events
['touchstart', 'touchmove', 'touchend'].each(function(type){
Element.NativeEvents[type] = 2;
});
// Initialize stuff
this.thumbs = thumbs;
this.innerWrappers = new Array();
this.images = new Array();
this.cells = new Array();
this.cellWidths = new Array();
this.parentDiv = $(parentId);
this.index = 0;
this.width = 0;
this.maxImageHeight = 0;
var parentDivPosition = this.parentDiv.getPosition();
this.leftOffset = parentDivPosition.x;
this.currentXOffset = 0;
var frame = new Element('div', {
'class': this.frameClass
});
this.frame = frame;
var self = this;
this.thumbs.each(function(thumb, i) {
var newCell = new Element('div', {
'class': self.cellClass
});
newCell.setStyles({
'-webkit-perspective': '500',
'-moz-perspective': '500',
'-o-perspective': '500',
'perspective': '500',
'float': 'left'
})
var imageElement = new Element('img', {
'src': thumb.image,
'class': self.imageClass
});
imageElement.setStyles({
'display': 'block',
'margin': '0px auto',
'margin-bottom': '0.5em'
});
var innerWrapper = new Element('div');
innerWrapper.setStyles({
'text-align': 'center',
'-webkit-transition-property': '-webkit-transform',
'-webkit-transition-duration': self.transitionTime,
// moz/opera/w3c
'-moz-transition-property': '-moz-transform',
'-moz-transition-duration': self.transitionTime,
'-o-transition-property': '-o-transform',
'-o-transition-duration': self.transitionTime,
'transition-property': 'transform',
'transition-duration': self.transitionTime
});
innerWrapper.adopt(imageElement);
innerWrapper.appendText(thumb.caption);
newCell.adopt(innerWrapper);
frame.adopt(newCell);
self.cells[i] = newCell;
self.images[i] = imageElement;
self.innerWrappers[i] = innerWrapper;
// As each image loads, grow the container to fit all the cells
imageElement.addEvent('load', function() {
self.adjustCellWidths();
var tempSize = imageElement.getSize();
if(tempSize.y > self.maxImageHeight) {
self.maxImageHeight = tempSize.y;
}
self.adjustYOffsets();
self.select(self.index);
});
});
this.parentDiv.setStyles({
overflow: 'hidden'
});
frame.setStyles({
height: 'inherit',
position: 'relative',
'-webkit-transition-property': '-webkit-transform',
'-webkit-transition-duration': this.transitionTime,
'-webkit-transition-timing-function': 'ease-out',
'-moz-transition-property': '-moz-transform',
'-moz-transition-duration': this.transitionTime,
'-moz-transition-timing-function': 'ease-out', // maybe works?
'-o-transition-property': '-o-transform',
'-o-transition-duration': this.transitionTime,
'-o-transition-timing-function': 'ease-out',
'transition-property': 'transform',
'transition-duration': this.transitionTime,
'transition-timing-function': 'ease-out'
});
this.parentDiv.adopt(frame);
// Delegate touch events
this.parentDiv.addEvent('touchstart', function(e) {
self.touchstart(event.touches[0].pageX);
e.preventDefault();
});
this.parentDiv.addEvent('touchmove', function(e) {
self.touchmove(event.touches[0].pageX);
e.preventDefault();
});
this.parentDiv.addEvent('touchend', function(e) {
self.touchend();
e.preventDefault();
});
this.parentDiv.addEvent('mousedown', function(e) {
self.mousedown = true;
self.touchstart(e.event.pageX);
e.preventDefault();
});
// Bound to the window because we want this to work even if the user
// moves the mouse out of the bounds of the flow panel
window.addEvent('mousemove', function(e) {
if(self.mousedown) {
self.touchmove(e.event.pageX);
e.preventDefault();
}
});
window.addEvent('mouseup', function(e) {
if(self.mousedown) {
self.mousedown = false;
self.touchend();
e.preventDefault();
}
});
},
// Record the widths of each cell and resize the frame to fit
adjustCellWidths: function() {
var self = this;
self.images.each(function(image, i) {
self.cellWidths[i] = image.getParent().getSize().x;
});
var sum = 0;
for(var i = 0; i < self.cellWidths.length; i++) {
sum += self.cellWidths[i];
}
self.width = sum;
self.frame.setStyles({
width: self.width
});
},
touchstart: function(pageX) {
this.touchstartX = pageX;
this.touchDelta = 0;
this.frame.setStyles({
'-webkit-transition-duration': '0s',
'-moz-transition-duration': '0s',
'-o-transition-duration': '0s',
'transition-duration': '0s'
});
},
touchmove: function(pageX) {
this.lastDelta = this.touchDelta;
this.touchDelta = pageX - this.touchstartX;
this.touchstartTime = new Date();
var newOffset = this.currentXOffset + this.touchDelta;
var centeredCellIndex = this.getIndexForOffset(newOffset);
this.highlightCell(centeredCellIndex);
this.frame.setStyles({
'-webkit-transform': 'translate3d(' + newOffset + 'px,0,0)',
'-moz-transform': 'translate3d(' + newOffset + 'px,0,0)',
'-o-transform': 'translate3d(' + newOffset + 'px,0,0)',
'transform': 'translate3d(' + newOffset + 'px,0,0)'
});
},
touchend: function() {
if(this.touchDelta == 0) {
// No movement, i.e. a tap
var tapX = this.touchstartX - this.currentXOffset - this.leftOffset;
var tapIndex = this.getIndexForTapX(tapX);
if(tapIndex !== null) {
if(tapIndex == this.index) {
// If the tap is on the selected cell
this.thumbs[this.index].action(this.index);
} else {
this.frame.setStyles({
'-webkit-transition-duration': this.transitionTime,
'-moz-transition-duration': this.transitionTime,
'-o-transition-duration': this.transitionTime,
'transition-duration': this.transitionTime
});
this.select(tapIndex);
if(this.tapToSelectTriggersAction) {
this.thumbs[this.index].action(this.index);
}
}
}
} else {
// Movement, i.e. a panning gesture
var deltaDelta = this.touchDelta - this.lastDelta;
var timeDelta = (new Date()) - this.touchstartTime + 1;
var exaggeratedTouchDelta = this.touchDelta + deltaDelta * 100 / timeDelta;
var newOffset = this.currentXOffset + exaggeratedTouchDelta;
this.select(this.getIndexForOffset(newOffset));
}
this.frame.setStyles({
'-webkit-transition-duration': this.transitionTime,
'-moz-transition-duration': this.transitionTime,
'-o-transition-duration': this.transitionTime,
'transition-duration': this.transitionTime
});
},
// Adjust the positions of the cells so everything's aligned
// with the bottom of the frame
adjustYOffsets: function() {
var self = this;
this.images.each(function(image, i) {
var tempSize = image.getSize();
var cell = self.cells[i];
cell.setStyles({
position: 'relative',
top: self.maxImageHeight - tempSize.y
});
});
},
// Make a list of the x offsets for each cell
buildOffsetArray: function() {
this.offsets = new Array();
var self = this;
this.cellWidths.each(function(cellWidth, i) {
if(i == 0) {
self.offsets[i] = cellWidth;
} else {
self.offsets[i] = self.offsets[i-1] + cellWidth;
}
});
},
// Given an x coordinate, return the index of the corresponding cell
getIndexForTapX: function(tapX) {
if(!$chk(this.offsets)) {
this.buildOffsetArray();
}
if(tapX < 0) {
return null;
}
for(var i = 0; i < this.offsets.length; i++) {
var cellOffset = this.offsets[i];
if(tapX < cellOffset) {
return(i);
}
}
return null;
},
// Given an offset, return the index of the centered cell
getIndexForOffset: function(currentOffset) {
if(!$chk(this.offsets)) {
this.buildOffsetArray();
}
var parentSize = this.parentDiv.getSize();
var halfParentWidth = 0.5 * parentSize.x;
var xValueAtMiddle = halfParentWidth - currentOffset;
for(var i = 0; i < this.offsets.length; i++) {
var cellOffset = this.offsets[i];
if(xValueAtMiddle < cellOffset) {
return(i);
}
}
return(this.offsets.length - 1);
},
widthOfPreviousImages: function(index) {
var widthOfPreviousImages = 0;
this.cellWidths.each(function(width, i) {
if(i < index) {
widthOfPreviousImages += width;
}
});
return(widthOfPreviousImages);
},
highlightCell: function(index) {
var self = this;
this.innerWrappers.each(function(innerWrapper, i) {
var image = self.images[i];
if(i < index) {
//innerWrapper.setStyle('-webkit-transform', 'translate3d(0,0,' + self.zOffset + ') rotateY(' + self.rotationValue + ')');
innerWrapper.setStyles({
'-webkit-transform': 'translate3d(0,0,' + self.zOffset + ') rotateY(' + self.rotationValue + ')',
'-moz-transform': 'translate3d(0,0,' + self.zOffset + ') rotateY(' + self.rotationValue + ')',
'-o-transform': 'translate3d(0,0,' + self.zOffset + ') rotateY(' + self.rotationValue + ')',
'transform': 'translate3d(0,0,' + self.zOffset + ') rotateY(' + self.rotationValue + ')'
});
}
if(i == index) {
//innerWrapper.setStyle('-webkit-transform', 'translate3d(0,0,0) rotateY(0deg)');
innerWrapper.setStyles({
'-webkit-transform': 'translate3d(0,0,0) rotateY(0deg)',
'-moz-transform': 'translate3d(0,0,0) rotateY(0deg)',
'-o-transform': 'translate3d(0,0,0) rotateY(0deg)',
'transform': 'translate3d(0,0,0) rotateY(0deg)'
});
}
if(i > index) {
//innerWrapper.setStyle('-webkit-transform', 'translate3d(0,0,' + self.zOffset + ') rotateY(-' + self.rotationValue + ')');
innerWrapper.setStyles({
'-webkit-transform': 'translate3d(0,0,' + self.zOffset + ') rotateY(-' + self.rotationValue + ')',
'-moz-transform': 'translate3d(0,0,' + self.zOffset + ') rotateY(-' + self.rotationValue + ')',
'-o-transform': 'translate3d(0,0,' + self.zOffset + ') rotateY(-' + self.rotationValue + ')',
'transform': 'translate3d(0,0,' + self.zOffset + ') rotateY(-' + self.rotationValue + ')'
});
}
});
},
translateFrameToCell: function(newIndex) {
var widthOfPreviousImages = this.widthOfPreviousImages(newIndex);
var parentSize = this.parentDiv.getSize();
var offset = (0.5*(parentSize.x - this.cellWidths[newIndex])) - widthOfPreviousImages;
this.currentXOffset = offset;
this.frame.setStyles({
'-webkit-transform': 'translate3d(' + offset +'px,0,0)',
'-moz-transform': 'translate3d(' + offset +'px,0,0)',
'-o-transform': 'translate3d(' + offset +'px,0,0)',
'transform': 'translate3d(' + offset +'px,0,0)'
});
},
select: function(newIndex) {
this.index = newIndex;
this.highlightCell(newIndex);
this.translateFrameToCell(newIndex);
},
selectNext: function() {
if(this.index < this.thumbs.length-1) {
this.select(this.index + 1)
}
},
selectPrevious: function() {
if(this.index > 0) {
this.select(this.index - 1)
}
},
turnOnArrowKeys: function() {
var self = this;
window.addEventListener('keydown', function(e) {
if (e.keyCode == 37) { // Left
self.selectPrevious();
} else if (e.keyCode == 39) { // Right
self.selectNext();
}
});
}
});