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improve scrolling performances a little

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Athou
2013-05-29 10:37:29 +02:00
parent 869d7c3a36
commit e6cf48d4f6
1 changed files with 6 additions and 2 deletions
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8
src/main/webapp/js/directives.js
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@@ -71,12 +71,16 @@ module.directive('onScrollMiddle', function () {
var d = $(document); var d = $(document);
var down = function() { var down = function() {
if (w.data.scrollDirection != 'down')
return;
var docTop = w.scrollTop(); var docTop = w.scrollTop();
var elemTop = e.offset().top; var elemTop = e.offset().top;
var threshold = docTop === 0 ? elemTop - 1 : docTop + w.height() / 3; var threshold = docTop === 0 ? elemTop - 1 : docTop + w.height() / 3;
return (elemTop > threshold) ? 'below' : 'above'; return (elemTop > threshold) ? 'below' : 'above';
}; };
var up = function() { var up = function() {
if (w.data.scrollDirection != 'up')
return;
var docTop = w.scrollTop(); var docTop = w.scrollTop();
var elemTop = e.offset().top; var elemTop = e.offset().top;
var elemBottom = elemTop + e.height(); var elemBottom = elemTop + e.height();
@@ -96,11 +100,11 @@ module.directive('onScrollMiddle', function () {
w.data.scrollInit = true; w.data.scrollInit = true;
} }
scope.$watch(down, function downCallback(value, oldValue) { scope.$watch(down, function downCallback(value, oldValue) {
if(w.data.scrollDirection == 'down' && value != oldValue && value == 'above') if(value && value != oldValue && value == 'above')
scope.$eval(attrs.onScrollMiddle); scope.$eval(attrs.onScrollMiddle);
}); });
scope.$watch(up, function upCallback(value, oldValue) { scope.$watch(up, function upCallback(value, oldValue) {
if(w.data.scrollDirection == 'up' && value != oldValue && value == 'below') if(value && value != oldValue && value == 'below')
scope.$eval(attrs.onScrollMiddle); scope.$eval(attrs.onScrollMiddle);
}); });
} }