topical media & game development
mobile-application-11-DerbyApp.iPhone-www-js-iscroll.js / js
/*!
* iScroll v4.1.2 ~ Copyright (c) 2011 Matteo Spinelli, http://cubiq.org
* Released under MIT license, http://cubiq.org/license
*/
(function(){
var m = Math,
vendor = (/webkit/i).test(navigator.appVersion) ? 'webkit' :
(/firefox/i).test(navigator.userAgent) ? 'Moz' :
'opera' in window ? 'O' : '',
// Browser capabilities
has3d = 'WebKitCSSMatrix' in window && 'm11' in new WebKitCSSMatrix(),
hasTouch = 'ontouchstart' in window,
hasTransform = vendor + 'Transform' in document.documentElement.style,
isAndroid = (/android/gi).test(navigator.appVersion),
isIDevice = (/iphone|ipad/gi).test(navigator.appVersion),
isPlaybook = (/playbook/gi).test(navigator.appVersion),
hasTransitionEnd = (isIDevice || isPlaybook) && 'onwebkittransitionend' in window,
nextFrame = (function() {
return window.requestAnimationFrame
|| window.webkitRequestAnimationFrame
|| window.mozRequestAnimationFrame
|| window.oRequestAnimationFrame
|| window.msRequestAnimationFrame
|| function(callback) { return setTimeout(callback, 17); }
})(),
cancelFrame = (function () {
return window.cancelRequestAnimationFrame
|| window.webkitCancelRequestAnimationFrame
|| window.mozCancelRequestAnimationFrame
|| window.oCancelRequestAnimationFrame
|| window.msCancelRequestAnimationFrame
|| clearTimeout
})(),
// Events
RESIZE_EV = 'onorientationchange' in window ? 'orientationchange' : 'resize',
START_EV = hasTouch ? 'touchstart' : 'mousedown',
MOVE_EV = hasTouch ? 'touchmove' : 'mousemove',
END_EV = hasTouch ? 'touchend' : 'mouseup',
CANCEL_EV = hasTouch ? 'touchcancel' : 'mouseup',
WHEEL_EV = vendor == 'Moz' ? 'DOMMouseScroll' : 'mousewheel',
// Helpers
trnOpen = 'translate' + (has3d ? '3d(' : '('),
trnClose = has3d ? ',0)' : ')',
// Constructor
iScroll = function (el, options) {
var that = this,
doc = document,
i;
that.wrapper = typeof el == 'object' ? el : doc.getElementById(el);
that.wrapper.style.overflow = 'hidden';
that.scroller = that.wrapper.children[0];
// Default options
that.options = {
hScroll: true,
vScroll: true,
bounce: true,
bounceLock: false,
momentum: true,
lockDirection: true,
useTransform: true,
useTransition: false,
// Scrollbar
hScrollbar: true,
vScrollbar: true,
fixedScrollbar: isAndroid,
hideScrollbar: isIDevice,
fadeScrollbar: isIDevice && has3d,
scrollbarClass: '',
// Zoom
zoom: false,
zoomMin: 1,
zoomMax: 4,
doubleTapZoom: 2,
// Snap
snap: false,
snapThreshold: 1,
// Events
onRefresh: null,
onBeforeScrollStart: function (e) { e.preventDefault(); },
onScrollStart: null,
onBeforeScrollMove: null,
onScrollMove: null,
onBeforeScrollEnd: null,
onScrollEnd: null,
onTouchEnd: null,
onDestroy: null
};
// User defined options
for (i in options) that.options[i] = options[i];
// Normalize options
that.options.useTransform = hasTransform ? that.options.useTransform : false;
that.options.hScrollbar = that.options.hScroll && that.options.hScrollbar;
that.options.vScrollbar = that.options.vScroll && that.options.vScrollbar;
that.options.zoom = that.options.useTransform && that.options.zoom;
that.options.useTransition = hasTransitionEnd && that.options.useTransition;
// Set some default styles
that.scroller.style[vendor + 'TransitionProperty'] = that.options.useTransform ? '-' + vendor.toLowerCase() + '-transform' : 'top left';
that.scroller.style[vendor + 'TransitionDuration'] = '0';
that.scroller.style[vendor + 'TransformOrigin'] = '0 0';
if (that.options.useTransition) that.scroller.style[vendor + 'TransitionTimingFunction'] = 'cubic-bezier(0.33,0.66,0.66,1)';
if (that.options.useTransform) that.scroller.style[vendor + 'Transform'] = trnOpen + '0,0' + trnClose;
else that.scroller.style.cssText += ';top:0;left:0';
if (that.options.useTransition) that.options.fixedScrollbar = true;
that.refresh();
that._bind(RESIZE_EV, window);
that._bind(START_EV);
if (!hasTouch) {
that._bind('mouseout', that.wrapper);
that._bind(WHEEL_EV);
}
};
// Prototype
iScroll.prototype = {
enabled: true,
x: 0,
y: 0,
steps: [],
scale: 1,
currPageX: 0, currPageY: 0,
pagesX: [], pagesY: [],
aniTime: null,
handleEvent: function (e) {
var that = this;
switch(e.type) {
case START_EV: that._start(e); break;
case MOVE_EV: that._move(e); break;
case END_EV:
case CANCEL_EV: that._end(e); break;
case RESIZE_EV: that._resize(); break;
case WHEEL_EV: that._wheel(e); break;
case 'mouseout': that._mouseout(e); break;
case 'webkitTransitionEnd': that._transitionEnd(e); break;
}
},
_scrollbar: function (dir) {
var that = this,
doc = document,
bar;
if (!that[dir + 'Scrollbar']) {
if (that[dir + 'ScrollbarWrapper']) {
if (hasTransform) that[dir + 'ScrollbarIndicator'].style[vendor + 'Transform'] = '';
that[dir + 'ScrollbarWrapper'].parentNode.removeChild(that[dir + 'ScrollbarWrapper']);
that[dir + 'ScrollbarWrapper'] = null;
that[dir + 'ScrollbarIndicator'] = null;
}
return;
}
if (!that[dir + 'ScrollbarWrapper']) {
// Create the scrollbar wrapper
bar = doc.createElement('div');
if (that.options.scrollbarClass) bar.className = that.options.scrollbarClass + dir.toUpperCase();
else bar.style.cssText = 'position:absolute;z-index:100;' + (dir == 'h' ? 'height:7px;bottom:1px;left:2px;right:' + (that.vScrollbar ? '7' : '2') + 'px' : 'width:7px;bottom:' + (that.hScrollbar ? '7' : '2') + 'px;top:2px;right:1px');
bar.style.cssText += ';pointer-events:none;-' + vendor + '-transition-property:opacity;-' + vendor + '-transition-duration:' + (that.options.fadeScrollbar ? '350ms' : '0') + ';overflow:hidden;opacity:' + (that.options.hideScrollbar ? '0' : '1');
that.wrapper.appendChild(bar);
that[dir + 'ScrollbarWrapper'] = bar;
// Create the scrollbar indicator
bar = doc.createElement('div');
if (!that.options.scrollbarClass) {
bar.style.cssText = 'position:absolute;z-index:100;background:rgba(0,0,0,0.5);border:1px solid rgba(255,255,255,0.9);-' + vendor + '-background-clip:padding-box;-' + vendor + '-box-sizing:border-box;' + (dir == 'h' ? 'height:100%' : 'width:100%') + ';-' + vendor + '-border-radius:3px;border-radius:3px';
}
bar.style.cssText += ';pointer-events:none;-' + vendor + '-transition-property:-' + vendor + '-transform;-' + vendor + '-transition-timing-function:cubic-bezier(0.33,0.66,0.66,1);-' + vendor + '-transition-duration:0;-' + vendor + '-transform:' + trnOpen + '0,0' + trnClose;
if (that.options.useTransition) bar.style.cssText += ';-' + vendor + '-transition-timing-function:cubic-bezier(0.33,0.66,0.66,1)';
that[dir + 'ScrollbarWrapper'].appendChild(bar);
that[dir + 'ScrollbarIndicator'] = bar;
}
if (dir == 'h') {
that.hScrollbarSize = that.hScrollbarWrapper.clientWidth;
that.hScrollbarIndicatorSize = m.max(m.round(that.hScrollbarSize * that.hScrollbarSize / that.scrollerW), 8);
that.hScrollbarIndicator.style.width = that.hScrollbarIndicatorSize + 'px';
that.hScrollbarMaxScroll = that.hScrollbarSize - that.hScrollbarIndicatorSize;
that.hScrollbarProp = that.hScrollbarMaxScroll / that.maxScrollX;
} else {
that.vScrollbarSize = that.vScrollbarWrapper.clientHeight;
that.vScrollbarIndicatorSize = m.max(m.round(that.vScrollbarSize * that.vScrollbarSize / that.scrollerH), 8);
that.vScrollbarIndicator.style.height = that.vScrollbarIndicatorSize + 'px';
that.vScrollbarMaxScroll = that.vScrollbarSize - that.vScrollbarIndicatorSize;
that.vScrollbarProp = that.vScrollbarMaxScroll / that.maxScrollY;
}
// Reset position
that._scrollbarPos(dir, true);
},
_resize: function () {
this.refresh();
},
_pos: function (x, y) {
x = this.hScroll ? x : 0;
y = this.vScroll ? y : 0;
if (this.options.useTransform) {
this.scroller.style[vendor + 'Transform'] = trnOpen + x + 'px,' + y + 'px' + trnClose + ' scale(' + this.scale + ')';
} else {
x = m.round(x);
y = m.round(y);
this.scroller.style.left = x + 'px';
this.scroller.style.top = y + 'px';
}
this.x = x;
this.y = y;
this._scrollbarPos('h');
this._scrollbarPos('v');
},
_scrollbarPos: function (dir, hidden) {
var that = this,
pos = dir == 'h' ? that.x : that.y,
size;
if (!that[dir + 'Scrollbar']) return;
pos = that[dir + 'ScrollbarProp'] * pos;
if (pos < 0) {
if (!that.options.fixedScrollbar) {
size = that[dir + 'ScrollbarIndicatorSize'] + m.round(pos * 3);
if (size < 8) size = 8;
that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'width' : 'height'] = size + 'px';
}
pos = 0;
} else if (pos > that[dir + 'ScrollbarMaxScroll']) {
if (!that.options.fixedScrollbar) {
size = that[dir + 'ScrollbarIndicatorSize'] - m.round((pos - that[dir + 'ScrollbarMaxScroll']) * 3);
if (size < 8) size = 8;
that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'width' : 'height'] = size + 'px';
pos = that[dir + 'ScrollbarMaxScroll'] + (that[dir + 'ScrollbarIndicatorSize'] - size);
} else {
pos = that[dir + 'ScrollbarMaxScroll'];
}
}
that[dir + 'ScrollbarWrapper'].style[vendor + 'TransitionDelay'] = '0';
that[dir + 'ScrollbarWrapper'].style.opacity = hidden && that.options.hideScrollbar ? '0' : '1';
that[dir + 'ScrollbarIndicator'].style[vendor + 'Transform'] = trnOpen + (dir == 'h' ? pos + 'px,0' : '0,' + pos + 'px') + trnClose;
},
_start: function (e) {
var that = this,
point = hasTouch ? e.touches[0] : e,
matrix, x, y,
c1, c2;
if (!that.enabled) return;
if (that.options.onBeforeScrollStart) that.options.onBeforeScrollStart.call(that, e);
if (that.options.useTransition) that._transitionTime(0);
that.moved = false;
that.animating = false;
that.zoomed = false;
that.distX = 0;
that.distY = 0;
that.absDistX = 0;
that.absDistY = 0;
that.dirX = 0;
that.dirY = 0;
// Gesture start
if (that.options.zoom && hasTouch && e.touches.length > 1) {
c1 = m.abs(e.touches[0].pageX-e.touches[1].pageX);
c2 = m.abs(e.touches[0].pageY-e.touches[1].pageY);
that.touchesDistStart = m.sqrt(c1 * c1 + c2 * c2);
that.originX = m.abs(e.touches[0].pageX + e.touches[1].pageX - that.wrapperOffsetLeft * 2) / 2 - that.x;
that.originY = m.abs(e.touches[0].pageY + e.touches[1].pageY - that.wrapperOffsetTop * 2) / 2 - that.y;
}
if (that.options.momentum) {
if (that.options.useTransform) {
// Very lame general purpose alternative to CSSMatrix
matrix = getComputedStyle(that.scroller, null)[vendor + 'Transform'].replace(/[^0-9-.,]/g, '').split(',');
x = matrix[4] * 1;
y = matrix[5] * 1;
} else {
x = getComputedStyle(that.scroller, null).left.replace(/[^0-9-]/g, '') * 1;
y = getComputedStyle(that.scroller, null).top.replace(/[^0-9-]/g, '') * 1;
}
if (x != that.x || y != that.y) {
if (that.options.useTransition) that._unbind('webkitTransitionEnd');
else cancelFrame(that.aniTime);
that.steps = [];
that._pos(x, y);
}
}
that.absStartX = that.x; // Needed by snap threshold
that.absStartY = that.y;
that.startX = that.x;
that.startY = that.y;
that.pointX = point.pageX;
that.pointY = point.pageY;
that.startTime = e.timeStamp || (new Date()).getTime();
if (that.options.onScrollStart) that.options.onScrollStart.call(that, e);
that._bind(MOVE_EV);
that._bind(END_EV);
that._bind(CANCEL_EV);
},
_move: function (e) {
var that = this,
point = hasTouch ? e.touches[0] : e,
deltaX = point.pageX - that.pointX,
deltaY = point.pageY - that.pointY,
newX = that.x + deltaX,
newY = that.y + deltaY,
c1, c2, scale,
timestamp = e.timeStamp || (new Date()).getTime();
if (that.options.onBeforeScrollMove) that.options.onBeforeScrollMove.call(that, e);
// Zoom
if (that.options.zoom && hasTouch && e.touches.length > 1) {
c1 = m.abs(e.touches[0].pageX - e.touches[1].pageX);
c2 = m.abs(e.touches[0].pageY - e.touches[1].pageY);
that.touchesDist = m.sqrt(c1*c1+c2*c2);
that.zoomed = true;
scale = 1 / that.touchesDistStart * that.touchesDist * this.scale;
if (scale < 0.5) scale = 0.5;
else if (scale > that.options.zoomMax) scale = that.options.zoomMax;
that.lastScale = scale / this.scale;
newX = this.originX - this.originX * that.lastScale + this.x,
newY = this.originY - this.originY * that.lastScale + this.y;
this.scroller.style[vendor + 'Transform'] = trnOpen + newX + 'px,' + newY + 'px' + trnClose + ' scale(' + scale + ')';
return;
}
that.pointX = point.pageX;
that.pointY = point.pageY;
// Slow down if outside of the boundaries
if (newX > 0 || newX < that.maxScrollX) {
newX = that.options.bounce ? that.x + (deltaX / 2) : newX >= 0 || that.maxScrollX >= 0 ? 0 : that.maxScrollX;
}
if (newY > 0 || newY < that.maxScrollY) {
newY = that.options.bounce ? that.y + (deltaY / 2) : newY >= 0 || that.maxScrollY >= 0 ? 0 : that.maxScrollY;
}
if (that.absDistX < 6 && that.absDistY < 6) {
that.distX += deltaX;
that.distY += deltaY;
that.absDistX = m.abs(that.distX);
that.absDistY = m.abs(that.distY);
return;
}
// Lock direction
if (that.options.lockDirection) {
if (that.absDistX > that.absDistY + 5) {
newY = that.y;
deltaY = 0;
} else if (that.absDistY > that.absDistX + 5) {
newX = that.x;
deltaX = 0;
}
}
that.moved = true;
that._pos(newX, newY);
that.dirX = deltaX > 0 ? -1 : deltaX < 0 ? 1 : 0;
that.dirY = deltaY > 0 ? -1 : deltaY < 0 ? 1 : 0;
if (timestamp - that.startTime > 300) {
that.startTime = timestamp;
that.startX = that.x;
that.startY = that.y;
}
if (that.options.onScrollMove) that.options.onScrollMove.call(that, e);
},
_end: function (e) {
if (hasTouch && e.touches.length != 0) return;
var that = this,
point = hasTouch ? e.changedTouches[0] : e,
target, ev,
momentumX = { dist:0, time:0 },
momentumY = { dist:0, time:0 },
duration = (e.timeStamp || (new Date()).getTime()) - that.startTime,
newPosX = that.x,
newPosY = that.y,
distX, distY,
newDuration;
that._unbind(MOVE_EV);
that._unbind(END_EV);
that._unbind(CANCEL_EV);
if (that.options.onBeforeTouchEnd) that.options.onBeforeTouchEnd.call(that, e);
if (that.zoomed) {
that.scale = that.scale * that.lastScale;
that.x = that.originX - that.originX * that.lastScale + that.x;
that.y = that.originY - that.originY * that.lastScale + that.y;
that.scroller.style.webkitTransform = trnOpen + that.x + 'px,' + that.y + 'px' + trnClose + ' scale(' + that.scale + ')';
that.refresh();
return;
}
if (!that.moved) {
if (hasTouch) {
if (that.doubleTapTimer && that.options.zoom) {
// Double tapped
clearTimeout(that.doubleTapTimer);
that.doubleTapTimer = null;
that.zoom(that.pointX, that.pointY, that.scale == 1 ? that.options.doubleTapZoom : 1);
} else {
that.doubleTapTimer = setTimeout(function () {
that.doubleTapTimer = null;
// Find the last touched element
target = point.target;
while (target.nodeType != 1) target = target.parentNode;
if (target.tagName != 'SELECT' && target.tagName != 'INPUT' && target.tagName != 'TEXTAREA') {
ev = document.createEvent('MouseEvents');
ev.initMouseEvent('click', true, true, e.view, 1,
point.screenX, point.screenY, point.clientX, point.clientY,
e.ctrlKey, e.altKey, e.shiftKey, e.metaKey,
0, null);
ev._fake = true;
target.dispatchEvent(ev);
}
}, that.options.zoom ? 250 : 0);
}
}
that._resetPos(200);
if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
return;
}
if (duration < 300 && that.options.momentum) {
momentumX = newPosX ? that._momentum(newPosX - that.startX, duration, -that.x, that.scrollerW - that.wrapperW + that.x, that.options.bounce ? that.wrapperW : 0) : momentumX;
momentumY = newPosY ? that._momentum(newPosY - that.startY, duration, -that.y, (that.maxScrollY < 0 ? that.scrollerH - that.wrapperH + that.y : 0), that.options.bounce ? that.wrapperH : 0) : momentumY;
newPosX = that.x + momentumX.dist;
newPosY = that.y + momentumY.dist;
if ((that.x > 0 && newPosX > 0) || (that.x < that.maxScrollX && newPosX < that.maxScrollX)) momentumX = { dist:0, time:0 };
if ((that.y > 0 && newPosY > 0) || (that.y < that.maxScrollY && newPosY < that.maxScrollY)) momentumY = { dist:0, time:0 };
}
if (momentumX.dist || momentumY.dist) {
newDuration = m.max(m.max(momentumX.time, momentumY.time), 10);
// Do we need to snap?
if (that.options.snap) {
distX = newPosX - that.absStartX;
distY = newPosY - that.absStartY;
if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) { that.scrollTo(that.absStartX, that.absStartY, 200); }
else {
snap = that._snap(newPosX, newPosY);
newPosX = snap.x;
newPosY = snap.y;
newDuration = m.max(snap.time, newDuration);
}
}
that.scrollTo(newPosX, newPosY, newDuration);
if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
return;
}
// Do we need to snap?
if (that.options.snap) {
distX = newPosX - that.absStartX;
distY = newPosY - that.absStartY;
if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) that.scrollTo(that.absStartX, that.absStartY, 200);
else {
snap = that._snap(that.x, that.y);
if (snap.x != that.x || snap.y != that.y) that.scrollTo(snap.x, snap.y, snap.time);
}
if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
return;
}
that._resetPos(200);
if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
},
_resetPos: function (time) {
var that = this,
resetX = that.x >= 0 ? 0 : that.x < that.maxScrollX ? that.maxScrollX : that.x,
resetY = that.y >= 0 || that.maxScrollY > 0 ? 0 : that.y < that.maxScrollY ? that.maxScrollY : that.y;
if (resetX == that.x && resetY == that.y) {
if (that.moved) {
that.moved = false;
if (that.options.onScrollEnd) that.options.onScrollEnd.call(that); // Execute custom code on scroll end
}
if (that.hScrollbar && that.options.hideScrollbar) {
if (vendor == 'webkit') that.hScrollbarWrapper.style[vendor + 'TransitionDelay'] = '300ms';
that.hScrollbarWrapper.style.opacity = '0';
}
if (that.vScrollbar && that.options.hideScrollbar) {
if (vendor == 'webkit') that.vScrollbarWrapper.style[vendor + 'TransitionDelay'] = '300ms';
that.vScrollbarWrapper.style.opacity = '0';
}
return;
}
that.scrollTo(resetX, resetY, time || 0);
},
_wheel: function (e) {
var that = this,
deltaX, deltaY;
if ('wheelDeltaX' in e) {
deltaX = that.x + e.wheelDeltaX / 12,
deltaY = that.y + e.wheelDeltaY / 12;
} else if ('detail' in e) {
deltaX = that.x - e.detail * 3,
deltaY = that.y - e.detail * 3;
} else {
deltaX = that.x - e.wheelDelta,
deltaY = that.y - e.wheelDelta;
}
if (deltaX > 0) deltaX = 0;
else if (deltaX < that.maxScrollX) deltaX = that.maxScrollX;
if (deltaY > 0) deltaY = 0;
else if (deltaY < that.maxScrollY) deltaY = that.maxScrollY;
that.scrollTo(deltaX, deltaY, 0);
},
_mouseout: function (e) {
var t = e.relatedTarget;
if (!t) {
this._end(e);
return;
}
while (t = t.parentNode) if (t == this.wrapper) return;
this._end(e);
},
_transitionEnd: function (e) {
var that = this;
if (e.target != that.scroller) return;
that._unbind('webkitTransitionEnd');
that._startAni();
},
Utilities
_startAni: function () {
var that = this,
startX = that.x, startY = that.y,
startTime = (new Date).getTime(),
step, easeOut;
if (that.animating) return;
if (!that.steps.length) {
that._resetPos(400);
return;
}
step = that.steps.shift();
if (step.x == startX && step.y == startY) step.time = 0;
that.animating = true;
that.moved = true;
if (that.options.useTransition) {
that._transitionTime(step.time);
that._pos(step.x, step.y);
that.animating = false;
if (step.time) that._bind('webkitTransitionEnd');
return;
}
(function animate () {
var now = (new Date).getTime(),
newX, newY;
if (now >= startTime + step.time) {
that._pos(step.x, step.y);
that.animating = false;
if (that.options.onAnimationEnd) that.options.onAnimationEnd.call(that); // Execute custom code on animation end
that._startAni();
return;
}
now = (now - startTime) / step.time - 1;
easeOut = m.sqrt(1 - now * now);
newX = (step.x - startX) * easeOut + startX;
newY = (step.y - startY) * easeOut + startY;
that._pos(newX, newY);
if (that.animating) that.aniTime = nextFrame(animate);
})();
},
_transitionTime: function (time) {
var that = this;
time += 'ms';
that.scroller.style[vendor + 'TransitionDuration'] = time;
if (that.hScrollbar) that.hScrollbarIndicator.style[vendor + 'TransitionDuration'] = time;
if (that.vScrollbar) that.vScrollbarIndicator.style[vendor + 'TransitionDuration'] = time;
},
_momentum: function (dist, time, maxDistUpper, maxDistLower, size) {
var deceleration = 0.0006,
speed = m.abs(dist) / time,
newDist = (speed * speed) / (2 * deceleration),
newTime = 0, outsideDist = 0;
// Proportinally reduce speed if we are outside of the boundaries
if (dist > 0 && newDist > maxDistUpper) {
outsideDist = size / (6 / (newDist / speed * deceleration));
maxDistUpper = maxDistUpper + outsideDist;
speed = speed * maxDistUpper / newDist;
newDist = maxDistUpper;
} else if (dist < 0 && newDist > maxDistLower) {
outsideDist = size / (6 / (newDist / speed * deceleration));
maxDistLower = maxDistLower + outsideDist;
speed = speed * maxDistLower / newDist;
newDist = maxDistLower;
}
newDist = newDist * (dist < 0 ? -1 : 1);
newTime = speed / deceleration;
return { dist: newDist, time: m.round(newTime) };
},
_offset: function (el) {
var left = -el.offsetLeft,
top = -el.offsetTop;
while (el = el.offsetParent) {
left -= el.offsetLeft;
top -= el.offsetTop;
}
return { left: left, top: top };
},
_snap: function (x, y) {
var that = this,
i, l,
page, time,
sizeX, sizeY;
// Check page X
page = that.pagesX.length - 1;
for (i=0, l=that.pagesX.length; i<l; i++) {
if (x >= that.pagesX[i]) {
page = i;
break;
}
}
if (page == that.currPageX && page > 0 && that.dirX < 0) page--;
x = that.pagesX[page];
sizeX = m.abs(x - that.pagesX[that.currPageX]);
sizeX = sizeX ? m.abs(that.x - x) / sizeX * 500 : 0;
that.currPageX = page;
// Check page Y
page = that.pagesY.length-1;
for (i=0; i<page; i++) {
if (y >= that.pagesY[i]) {
page = i;
break;
}
}
if (page == that.currPageY && page > 0 && that.dirY < 0) page--;
y = that.pagesY[page];
sizeY = m.abs(y - that.pagesY[that.currPageY]);
sizeY = sizeY ? m.abs(that.y - y) / sizeY * 500 : 0;
that.currPageY = page;
// Snap with constant speed (proportional duration)
time = m.round(m.max(sizeX, sizeY)) || 200;
return { x: x, y: y, time: time };
},
_bind: function (type, el, bubble) {
(el || this.scroller).addEventListener(type, this, !!bubble);
},
_unbind: function (type, el, bubble) {
(el || this.scroller).removeEventListener(type, this, !!bubble);
},
Public methods
destroy: function () {
var that = this;
that.scroller.style[vendor + 'Transform'] = '';
// Remove the scrollbars
that.hScrollbar = false;
that.vScrollbar = false;
that._scrollbar('h');
that._scrollbar('v');
// Remove the event listeners
that._unbind(RESIZE_EV);
that._unbind(START_EV);
that._unbind(MOVE_EV);
that._unbind(END_EV);
that._unbind(CANCEL_EV);
if (that.options.hasTouch) {
that._unbind('mouseout', that.wrapper);
that._unbind(WHEEL_EV);
}
if (that.options.useTransition) that._unbind('webkitTransitionEnd');
if (that.options.onDestroy) that.options.onDestroy.call(that);
},
refresh: function () {
var that = this,
offset,
pos = 0,
page = 0;
if (that.scale < that.options.zoomMin) that.scale = that.options.zoomMin;
that.wrapperW = that.wrapper.clientWidth || 1;
that.wrapperH = that.wrapper.clientHeight || 1;
that.scrollerW = m.round(that.scroller.offsetWidth * that.scale);
that.scrollerH = m.round(that.scroller.offsetHeight * that.scale);
that.maxScrollX = that.wrapperW - that.scrollerW;
that.maxScrollY = that.wrapperH - that.scrollerH;
that.dirX = 0;
that.dirY = 0;
that.hScroll = that.options.hScroll && that.maxScrollX < 0;
that.vScroll = that.options.vScroll && (!that.options.bounceLock && !that.hScroll || that.scrollerH > that.wrapperH);
that.hScrollbar = that.hScroll && that.options.hScrollbar;
that.vScrollbar = that.vScroll && that.options.vScrollbar && that.scrollerH > that.wrapperH;
offset = that._offset(that.wrapper);
that.wrapperOffsetLeft = -offset.left;
that.wrapperOffsetTop = -offset.top;
// Prepare snap
if (typeof that.options.snap == 'string') {
that.pagesX = [];
that.pagesY = [];
els = that.scroller.querySelectorAll(that.options.snap);
for (i=0, l=els.length; i<l; i++) {
pos = that._offset(els[i]);
pos.left += that.wrapperOffsetLeft;
pos.top += that.wrapperOffsetTop;
that.pagesX[i] = pos.left < that.maxScrollX ? that.maxScrollX : pos.left * that.scale;
that.pagesY[i] = pos.top < that.maxScrollY ? that.maxScrollY : pos.top * that.scale;
}
} else if (that.options.snap) {
that.pagesX = [];
while (pos >= that.maxScrollX) {
that.pagesX[page] = pos;
pos = pos - that.wrapperW;
page++;
}
if (that.maxScrollX\%that.wrapperW) that.pagesX[that.pagesX.length] = that.maxScrollX - that.pagesX[that.pagesX.length-1] + that.pagesX[that.pagesX.length-1];
pos = 0;
page = 0;
that.pagesY = [];
while (pos >= that.maxScrollY) {
that.pagesY[page] = pos;
pos = pos - that.wrapperH;
page++;
}
if (that.maxScrollY\%that.wrapperH) that.pagesY[that.pagesY.length] = that.maxScrollY - that.pagesY[that.pagesY.length-1] + that.pagesY[that.pagesY.length-1];
}
// Prepare the scrollbars
that._scrollbar('h');
that._scrollbar('v');
that.scroller.style[vendor + 'TransitionDuration'] = '0';
that._resetPos(200);
},
scrollTo: function (x, y, time, relative) {
var that = this,
step = x,
i, l;
that.stop();
if (!step.length) step = [{ x: x, y: y, time: time, relative: relative }];
for (i=0, l=step.length; i<l; i++) {
if (step[i].relative) { step[i].x = that.x - step[i].x; step[i].y = that.y - step[i].y; }
that.steps.push({ x: step[i].x, y: step[i].y, time: step[i].time || 0 });
}
that._startAni();
},
scrollToElement: function (el, time) {
var that = this, pos;
el = el.nodeType ? el : that.scroller.querySelector(el);
if (!el) return;
pos = that._offset(el);
pos.left += that.wrapperOffsetLeft;
pos.top += that.wrapperOffsetTop;
pos.left = pos.left > 0 ? 0 : pos.left < that.maxScrollX ? that.maxScrollX : pos.left;
pos.top = pos.top > 0 ? 0 : pos.top < that.maxScrollY ? that.maxScrollY : pos.top;
time = time === undefined ? m.max(m.abs(pos.left)*2, m.abs(pos.top)*2) : time;
that.scrollTo(pos.left, pos.top, time);
},
scrollToPage: function (pageX, pageY, time) {
var that = this, x, y;
if (that.options.snap) {
pageX = pageX == 'next' ? that.currPageX+1 : pageX == 'prev' ? that.currPageX-1 : pageX;
pageY = pageY == 'next' ? that.currPageY+1 : pageY == 'prev' ? that.currPageY-1 : pageY;
pageX = pageX < 0 ? 0 : pageX > that.pagesX.length-1 ? that.pagesX.length-1 : pageX;
pageY = pageY < 0 ? 0 : pageY > that.pagesY.length-1 ? that.pagesY.length-1 : pageY;
that.currPageX = pageX;
that.currPageY = pageY;
x = that.pagesX[pageX];
y = that.pagesY[pageY];
} else {
x = -that.wrapperW * pageX;
y = -that.wrapperH * pageY;
if (x < that.maxScrollX) x = that.maxScrollX;
if (y < that.maxScrollY) y = that.maxScrollY;
}
that.scrollTo(x, y, time || 400);
},
disable: function () {
this.stop();
this._resetPos(0);
this.enabled = false;
// If disabled after touchstart we make sure that there are no left over events
this._unbind(MOVE_EV);
this._unbind(END_EV);
this._unbind(CANCEL_EV);
},
enable: function () {
this.enabled = true;
},
stop: function () {
if (this.options.useTransition) this._unbind('webkitTransitionEnd');
else cancelFrame(this.aniTime);
this.steps = [];
this.moved = false;
this.animating = false;
},
zoom: function (x, y, scale, time) {
var that = this,
relScale = scale / that.scale;
if (!that.options.useTransform) return;
time = (time || 200) + 'ms'
x = x - that.wrapperOffsetLeft - that.x;
y = y - that.wrapperOffsetTop - that.y;
that.x = x - x * relScale + that.x;
that.y = y - y * relScale + that.y;
that.scale = scale;
that.scroller.style[vendor + 'TransitionDuration'] = time;
that.scroller.style[vendor + 'Transform'] = trnOpen + that.x + 'px,' + that.y + 'px' + trnClose + ' scale(' + scale + ')';
that.refresh();
}
};
if (typeof exports !== 'undefined') exports.iScroll = iScroll;
else window.iScroll = iScroll;
})();
(C) Æliens
04/09/2009
You may not copy or print any of this material without explicit permission of the author or the publisher.
In case of other copyright issues, contact the author.
