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<pre class="prettyprint lang-js"><span id='Ext-grid-PagingScroller'>/**
</span> * @class Ext.grid.PagingScroller
* @extends Ext.grid.Scroller
- *
- * @private
*/
Ext.define('Ext.grid.PagingScroller', {
extend: 'Ext.grid.Scroller',
* when scrolling up between records 0 and 34 and when scrolling down between records 65 and 99.
*/
percentageFromEdge: 0.35,
-
+
<span id='Ext-grid-PagingScroller-cfg-scrollToLoadBuffer'> /**
</span> * @cfg {Number} scrollToLoadBuffer This is the time in milliseconds to buffer load requests
* when scrolling the PagingScrollbar.
*/
scrollToLoadBuffer: 200,
-
+
activePrefetch: true,
-
+
chunkSize: 50,
snapIncrement: 25,
-
+
syncScroll: true,
-
+
initComponent: function() {
var me = this,
ds = me.store;
- ds.on('guaranteedrange', this.onGuaranteedRange, this);
- this.callParent(arguments);
+ ds.on('guaranteedrange', me.onGuaranteedRange, me);
+ me.callParent(arguments);
},
-
-
+
onGuaranteedRange: function(range, start, end) {
var me = this,
ds = me.store,
if (range.length && me.visibleStart < range[0].index) {
return;
}
-
+
ds.loadRecords(range);
if (!me.firstLoad) {
if (me.rendered) {
me.invalidate();
} else {
- me.on('afterrender', this.invalidate, this, {single: true});
+ me.on('afterrender', me.invalidate, me, {single: true});
}
me.firstLoad = true;
} else {
// adjust to visible
- me.syncTo();
+ // only sync if there is a paging scrollbar element and it has a scroll height (meaning it's currently in the DOM)
+ if (me.scrollEl && me.scrollEl.dom && me.scrollEl.dom.scrollHeight) {
+ me.syncTo();
+ }
}
},
-
+
syncTo: function() {
var me = this,
pnl = me.getPanel(),
store = pnl.store,
- scrollerElDom = this.el.dom,
+ scrollerElDom = this.scrollEl.dom,
rowOffset = me.visibleStart - store.guaranteedStart,
scrollBy = rowOffset * me.rowHeight,
scrollHeight = scrollerElDom.scrollHeight,
clientHeight = scrollerElDom.clientHeight,
scrollTop = scrollerElDom.scrollTop,
useMaximum;
-
+
+
// BrowserBug: clientHeight reports 0 in IE9 StrictMode
// Instead we are using offsetHeight and hardcoding borders
if (Ext.isIE9 && Ext.isStrict) {
}
// This should always be zero or greater than zero but staying
- // safe and less than 0 we'll scroll to the bottom.
+ // safe and less than 0 we'll scroll to the bottom.
useMaximum = (scrollHeight - clientHeight - scrollTop <= 0);
this.setViewScrollTop(scrollBy, useMaximum);
},
-
+
getPageData : function(){
var panel = this.getPanel(),
store = panel.store,
totalCount = store.getTotalCount();
-
+
return {
total : totalCount,
currentPage : store.currentPage,
toRecord: Math.min(store.currentPage * store.pageSize, totalCount)
};
},
-
+
onElScroll: function(e, t) {
var me = this,
panel = me.getPanel(),
guaranteedStart = store.guaranteedStart,
guaranteedEnd = store.guaranteedEnd,
totalCount = store.getTotalCount(),
- numFromEdge = Math.ceil(me.percentageFromEdge * store.pageSize),
+ numFromEdge = Math.ceil(me.percentageFromEdge * pageSize),
position = t.scrollTop,
visibleStart = Math.floor(position / me.rowHeight),
view = panel.down('tableview'),
visibleHeight = viewEl.getHeight(),
visibleAhead = Math.ceil(visibleHeight / me.rowHeight),
visibleEnd = visibleStart + visibleAhead,
- prevPage = Math.floor(visibleStart / store.pageSize),
- nextPage = Math.floor(visibleEnd / store.pageSize) + 2,
- lastPage = Math.ceil(totalCount / store.pageSize),
- //requestStart = visibleStart,
- requestStart = Math.floor(visibleStart / me.snapIncrement) * me.snapIncrement,
+ prevPage = Math.floor(visibleStart / pageSize),
+ nextPage = Math.floor(visibleEnd / pageSize) + 2,
+ lastPage = Math.ceil(totalCount / pageSize),
+ snap = me.snapIncrement,
+ requestStart = Math.floor(visibleStart / snap) * snap,
requestEnd = requestStart + pageSize - 1,
activePrefetch = me.activePrefetch;
if (totalCount >= pageSize) {
// end of request was past what the total is, grab from the end back a pageSize
if (requestEnd > totalCount - 1) {
- this.cancelLoad();
+ me.cancelLoad();
if (store.rangeSatisfied(totalCount - pageSize, totalCount - 1)) {
me.syncScroll = true;
}
store.guaranteeRange(totalCount - pageSize, totalCount - 1);
// Out of range, need to reset the current data set
- } else if (visibleStart < guaranteedStart || visibleEnd > guaranteedEnd) {
+ } else if (visibleStart <= guaranteedStart || visibleEnd > guaranteedEnd) {
+ if (visibleStart <= guaranteedStart) {
+ // need to scroll up
+ requestStart -= snap;
+ requestEnd -= snap;
+
+ if (requestStart < 0) {
+ requestStart = 0;
+ requestEnd = pageSize;
+ }
+ }
if (store.rangeSatisfied(requestStart, requestEnd)) {
- this.cancelLoad();
+ me.cancelLoad();
store.guaranteeRange(requestStart, requestEnd);
} else {
store.mask();
store.prefetchPage(nextPage);
}
}
-
-
+
if (me.syncScroll) {
me.syncTo();
}
},
-
+
getSizeCalculation: function() {
// Use the direct ownerCt here rather than the scrollerOwner
// because we are calculating widths/heights.
- var owner = this.ownerCt,
+ var me = this,
+ owner = me.ownerGrid,
view = owner.getView(),
- store = this.store,
- dock = this.dock,
- elDom = this.el.dom,
+ store = me.store,
+ dock = me.dock,
+ elDom = me.el.dom,
width = 1,
height = 1;
-
- if (!this.rowHeight) {
- this.rowHeight = view.el.down(view.getItemSelector()).getHeight(false, true);
+
+ if (!me.rowHeight) {
+ me.rowHeight = view.el.down(view.getItemSelector()).getHeight(false, true);
}
- height = store.getTotalCount() * this.rowHeight;
+ // If the Store is *locally* filtered, use the filtered count from getCount.
+ height = store[(!store.remoteFilter && store.isFiltered()) ? 'getCount' : 'getTotalCount']() * me.rowHeight;
if (isNaN(width)) {
width = 1;
height: height
};
},
-
+
attemptLoad: function(start, end) {
var me = this;
if (!me.loadTask) {
}
me.loadTask.delay(me.scrollToLoadBuffer, me.doAttemptLoad, me, [start, end]);
},
-
+
cancelLoad: function() {
if (this.loadTask) {
this.loadTask.cancel();
}
},
-
+
doAttemptLoad: function(start, end) {
var store = this.getPanel().store;
store.guaranteeRange(start, end);
},
-
+
setViewScrollTop: function(scrollTop, useMax) {
- var owner = this.getPanel(),
+ var me = this,
+ owner = me.getPanel(),
items = owner.query('tableview'),
i = 0,
len = items.length,
centerEl,
calcScrollTop,
maxScrollTop,
- scrollerElDom = this.el.dom;
-
+ scrollerElDom = me.el.dom;
+
owner.virtualScrollTop = scrollTop;
-
+
center = items[1] || items[0];
centerEl = center.el.dom;
-
- maxScrollTop = ((owner.store.pageSize * this.rowHeight) - centerEl.clientHeight);
- calcScrollTop = (scrollTop % ((owner.store.pageSize * this.rowHeight) + 1));
+
+ maxScrollTop = ((owner.store.pageSize * me.rowHeight) - centerEl.clientHeight);
+ calcScrollTop = (scrollTop % ((owner.store.pageSize * me.rowHeight) + 1));
if (useMax) {
calcScrollTop = maxScrollTop;
}
}
}
});
-
</pre>
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