automatically scroll to end of log

www/manager/grid/LogView.js

@@ -3,6 +3,8 @@ Ext.define('PVE.grig.LogView', {
 
     alias: ['widget.pveLogView'],
 
+    scrollToEnd: true,
+
     initComponent : function() {
 	var me = this;
 
@@ -22,26 +24,101 @@ Ext.define('PVE.grig.LogView', {
 	    }
 	});
 
+	var scrollEndMarker = false;
+	var autoscroll = true;
+
+	var scrollToEndFn = function() {
+	    var vertScroller = me.getVerticalScroller();
+	    if (!(vertScroller && vertScroller.scrollEl)) {
+		return;
+	    }
+
+	    var vertScrollerEl = vertScroller.scrollEl;
+            var vertScrollerElDom = vertScrollerEl.dom;
+            var maxDown = vertScrollerElDom.scrollHeight - 
+		vertScrollerElDom.clientHeight - 
+		vertScrollerElDom.scrollTop;
+
+	    scrollEndMarker = (maxDown <= 0);
+	
+	    if (me.scrollToEnd && scrollEndMarker) {
+		autoscroll = true;
+	    }
+
+	    if (!autoscroll) {
+		return;
+	    }
+
+            vertScroller.scrollByDeltaY(maxDown);
+
+	    // invalidate last page by removing last entry from cache
+	    store.prefetchData.removeAtKey(store.totalCount - 1);
+	    store.guaranteeRange(store.totalCount - store.pageSize, 
+				 store.totalCount - 1);
+	};
+
+	var onScroll = function() {
+	    var scroller = this;
+	    if (me.scrollToEnd && scrollEndMarker) {
+		autoscroll = false;	    
+	    }
+	};
+
 	Ext.apply(me, {
 	    store: store,
 	    features: [ {ftype: 'selectable'}],
 	    stateful: false,
 	    verticalScrollerType: 'paginggridscroller',
-	    loadMask: true,
 	    invalidateScrollerOnRefresh: false,
 	    viewConfig: {
+		loadMask: false,
 		trackOver: false,
 		stripeRows: false
 	    },
 	    hideHeaders: true,
 	    columns: [ 
 		{ header: "Text", dataIndex: 't', flex: 1 } 
-	    ]
+	    ],
+	    listeners: {
+		'scrollershow': function(scroller, orientation) {
+		    if (orientation !== 'vertical') {
+			return;
+		    }
+		    scroller.on('afterrender', function() {
+			me.mon(scroller.scrollEl, 'scroll', onScroll, scroller);
+		    });
+		},
+		'scrollerhide':  function(scroller, orientation) {
+		    if (orientation !== 'vertical') {
+			return;
+		    }
+		    autoscroll = false;	    
+		},
+	    }
 	});
 
 	me.callParent();
 
-	store.guaranteeRange(0, store.pageSize - 1);
+	var load_task = new Ext.util.DelayedTask();
+
+	var run_load_task = function() {
+	    if (!store.totalCount) {
+		store.guaranteeRange(0, store.pageSize - 1);
+	    } else {
+		scrollToEndFn();
+	    }
+	    load_task.delay(1000, run_load_task);
+	};
+
+	if (me.scrollToEnd) {
+	    run_load_task();
+	} else {
+	    store.guaranteeRange(0, store.pageSize - 1);
+	}
+
+	me.on('destroy', function() {
+	    load_task.cancel();
+	});
     }
 });