/**
- * @class Ext.Element
- */
-Ext.Element.addMethods({
- /**
- * Returns true if this element is scrollable.
- * @return {Boolean}
- */
- isScrollable : function(){
- var dom = this.dom;
- return dom.scrollHeight > dom.clientHeight || dom.scrollWidth > dom.clientWidth;
- },
-
- /**
- * 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.
- * @return {Element} this
- */
- scrollTo : function(side, value){
- this.dom["scroll" + (/top/i.test(side) ? "Top" : "Left")] = value;
- return this;
- },
-
- /**
- * 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;
- }
-});
-
-
\ No newline at end of file
+
+
+
+
+ The source code
+
+
+
+
+
+
+
/**
+ * @class Ext.Element
+ */
+Ext.override(Ext.Element, {
+ /**
+ * Returns true if this element is scrollable.
+ * @return {Boolean}
+ */
+ isScrollable : function(){
+ var dom = this.dom;
+ return dom.scrollHeight > dom.clientHeight || dom.scrollWidth > dom.clientWidth;
+ },
+
+ /**
+ * 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;
+ },
+
+ /**
+ * 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 (optional) 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,
+ obj = {},
+ prop;
+ if (!animate || !me.anim) {
+ // just setting the value, so grab the direction
+ prop = 'scroll' + (top ? 'Top' : 'Left');
+ dom[prop] = value;
+ }
+ else {
+ if (!Ext.isObject(animate)) {
+ animate = {};
+ }
+ obj['scroll' + (top ? 'Top' : 'Left')] = value;
+ me.animate(Ext.applyIf({
+ to: obj
+ }, animate));
+ }
+ return me;
+ },
+
+ /**
+ * Scrolls this element into view within the passed container.
+ * @param {String/HTMLElement/Ext.Element} container (optional) The container element to scroll (defaults to document.body). Should be a
+ * string (id), dom node, or Ext.Element.
+ * @param {Boolean} hscroll (optional) False to disable horizontal scroll (defaults to true)
+ * @return {Ext.Element} this
+ */
+ scrollIntoView : function(container, hscroll) {
+ 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;
+
+ if (el.offsetHeight > ctClientHeight || top < ctScrollTop) {
+ container.scrollTop = top;
+ } else if (bottom > ctBottom) {
+ container.scrollTop = bottom - ctClientHeight;
+ }
+ // corrects IE, other browsers will ignore
+ container.scrollTop = container.scrollTop;
+
+ if (hscroll !== false) {
+ if (el.offsetWidth > container.clientWidth || left < ctScrollLeft) {
+ container.scrollLeft = left;
+ }
+ else if (right > ctRight) {
+ container.scrollLeft = right - container.clientWidth;
+ }
+ container.scrollLeft = container.scrollLeft;
+ }
+ return this;
+ },
+
+ // private
+ scrollChildIntoView : function(child, hscroll) {
+ Ext.fly(child, '_scrollChildIntoView').scrollIntoView(this, hscroll);
+ },
+
+ /**
+ * 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 (optional) 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;
+ }
+});