Element.scroll.html
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<!DOCTYPE html>
<html>
<head>
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<title>The source code</title>
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<pre class="prettyprint lang-js"><span id='Ext-dom-Element'>/**
</span> * @class Ext.dom.Element
*/
Ext.dom.Element.override({
<span id='Ext-dom-Element-method-isScrollable'> /**
</span> * Returns true if this element is scrollable.
* @return {Boolean}
*/
isScrollable: function() {
var dom = this.dom;
return dom.scrollHeight > dom.clientHeight || dom.scrollWidth > dom.clientWidth;
},
<span id='Ext-dom-Element-method-getScroll'> /**
</span> * Returns the current scroll position of the element.
* @return {Object} An object containing the scroll position in the format
* `{left: (scrollLeft), top: (scrollTop)}`
*/
getScroll: function() {
var d = this.dom,
doc = document,
body = doc.body,
docElement = doc.documentElement,
l,
t,
ret;
if (d == doc || d == body) {
if (Ext.isIE && Ext.isStrict) {
l = docElement.scrollLeft;
t = docElement.scrollTop;
} else {
l = window.pageXOffset;
t = window.pageYOffset;
}
ret = {
left: l || (body ? body.scrollLeft : 0),
top : t || (body ? body.scrollTop : 0)
};
} else {
ret = {
left: d.scrollLeft,
top : d.scrollTop
};
}
return ret;
},
<span id='Ext-dom-Element-method-scrollBy'> /**
</span> * Scrolls this element by the passed delta values, optionally animating.
*
* All of the following are equivalent:
*
* el.scrollBy(10, 10, true);
* el.scrollBy([10, 10], true);
* el.scrollBy({ x: 10, y: 10 }, true);
*
* @param {Number/Number[]/Object} deltaX Either the x delta, an Array specifying x and y deltas or
* an object with "x" and "y" properties.
* @param {Number/Boolean/Object} deltaY Either the y delta, or an animate flag or config object.
* @param {Boolean/Object} animate Animate flag/config object if the delta values were passed separately.
* @return {Ext.Element} this
*/
scrollBy: function(deltaX, deltaY, animate) {
var me = this,
dom = me.dom;
// Extract args if deltas were passed as an Array.
if (deltaX.length) {
animate = deltaY;
deltaY = deltaX[1];
deltaX = deltaX[0];
} else if (typeof deltaX != 'number') { // or an object
animate = deltaY;
deltaY = deltaX.y;
deltaX = deltaX.x;
}
if (deltaX) {
me.scrollTo('left', Math.max(Math.min(dom.scrollLeft + deltaX, dom.scrollWidth - dom.clientWidth), 0), animate);
}
if (deltaY) {
me.scrollTo('top', Math.max(Math.min(dom.scrollTop + deltaY, dom.scrollHeight - dom.clientHeight), 0), animate);
}
return me;
},
<span id='Ext-dom-Element-method-scrollTo'> /**
</span> * Scrolls this element the specified scroll point. It does NOT do bounds checking so
* if you scroll to a weird value it will try to do it. For auto bounds checking, use #scroll.
* @param {String} side Either "left" for scrollLeft values or "top" for scrollTop values.
* @param {Number} value The new scroll value
* @param {Boolean/Object} [animate] true for the default animation or a standard Element
* animation config object
* @return {Ext.Element} this
*/
scrollTo: function(side, value, animate) {
//check if we're scrolling top or left
var top = /top/i.test(side),
me = this,
dom = me.dom,
animCfg,
prop;
if (!animate || !me.anim) {
// just setting the value, so grab the direction
prop = 'scroll' + (top ? 'Top' : 'Left');
dom[prop] = value;
// corrects IE, other browsers will ignore
dom[prop] = value;
}
else {
animCfg = {
to: {}
};
animCfg.to['scroll' + (top ? 'Top' : 'Left')] = value;
if (Ext.isObject(animate)) {
Ext.applyIf(animCfg, animate);
}
me.animate(animCfg);
}
return me;
},
<span id='Ext-dom-Element-method-scrollIntoView'> /**
</span> * Scrolls this element into view within the passed container.
* @param {String/HTMLElement/Ext.Element} [container=document.body] The container element
* to scroll. Should be a string (id), dom node, or Ext.Element.
* @param {Boolean} [hscroll=true] False to disable horizontal scroll.
* @param {Boolean/Object} [animate] true for the default animation or a standard Element
* animation config object
* @return {Ext.dom.Element} this
*/
scrollIntoView: function(container, hscroll, animate) {
container = Ext.getDom(container) || Ext.getBody().dom;
var el = this.dom,
offsets = this.getOffsetsTo(container),
// el's box
left = offsets[0] + container.scrollLeft,
top = offsets[1] + container.scrollTop,
bottom = top + el.offsetHeight,
right = left + el.offsetWidth,
// ct's box
ctClientHeight = container.clientHeight,
ctScrollTop = parseInt(container.scrollTop, 10),
ctScrollLeft = parseInt(container.scrollLeft, 10),
ctBottom = ctScrollTop + ctClientHeight,
ctRight = ctScrollLeft + container.clientWidth,
newPos;
if (el.offsetHeight > ctClientHeight || top < ctScrollTop) {
newPos = top;
} else if (bottom > ctBottom) {
newPos = bottom - ctClientHeight;
}
if (newPos != null) {
Ext.get(container).scrollTo('top', newPos, animate);
}
if (hscroll !== false) {
newPos = null;
if (el.offsetWidth > container.clientWidth || left < ctScrollLeft) {
newPos = left;
} else if (right > ctRight) {
newPos = right - container.clientWidth;
}
if (newPos != null) {
Ext.get(container).scrollTo('left', newPos, animate);
}
}
return this;
},
// @private
scrollChildIntoView: function(child, hscroll) {
Ext.fly(child, '_scrollChildIntoView').scrollIntoView(this, hscroll);
},
<span id='Ext-dom-Element-method-scroll'> /**
</span> * Scrolls this element the specified direction. Does bounds checking to make sure the scroll is
* within this element's scrollable range.
* @param {String} direction Possible values are:
*
* - `"l"` (or `"left"`)
* - `"r"` (or `"right"`)
* - `"t"` (or `"top"`, or `"up"`)
* - `"b"` (or `"bottom"`, or `"down"`)
*
* @param {Number} distance How far to scroll the element in pixels
* @param {Boolean/Object} [animate] true for the default animation or a standard Element
* animation config object
* @return {Boolean} Returns true if a scroll was triggered or false if the element
* was scrolled as far as it could go.
*/
scroll: function(direction, distance, animate) {
if (!this.isScrollable()) {
return false;
}
var el = this.dom,
l = el.scrollLeft, t = el.scrollTop,
w = el.scrollWidth, h = el.scrollHeight,
cw = el.clientWidth, ch = el.clientHeight,
scrolled = false, v,
hash = {
l: Math.min(l + distance, w - cw),
r: v = Math.max(l - distance, 0),
t: Math.max(t - distance, 0),
b: Math.min(t + distance, h - ch)
};
hash.d = hash.b;
hash.u = hash.t;
direction = direction.substr(0, 1);
if ((v = hash[direction]) > -1) {
scrolled = true;
this.scrollTo(direction == 'l' || direction == 'r' ? 'left' : 'top', v, this.anim(animate));
}
return scrolled;
}
});
</pre>
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