keepScroll: a directive to anchor the scroller position at the bottom when the browser is resizing

This commit is contained in:
Emmanuel ROHEE 2014-08-19 18:29:41 +02:00
parent b796d4b9d0
commit 9ca5bc7892
1 changed files with 27 additions and 0 deletions

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@ -104,6 +104,33 @@ angular.module('RoomController', ['ngSanitize'])
});
};
}])
// A directive to anchor the scroller position at the bottom when the browser is resizing.
// When the screen resizes, the bottom of the element remains the same, not the top.
.directive('keepScroll', ['$window', function($window) {
return {
link: function(scope, elem, attrs) {
scope.windowHeight = $window.innerHeight;
// Listen to window size change
angular.element($window).bind('resize', function() {
// If the scroller is scrolled to the bottom, there is nothing to do.
// The browser will move it as expected
if (elem.scrollTop() + elem.height() !== elem[0].scrollHeight) {
// Else, move the scroller position according to the window height change delta
var windowHeightDelta = $window.innerHeight - scope.windowHeight;
elem.scrollTop(elem.scrollTop() - windowHeightDelta);
}
// Store the new window height for the next screen size change
scope.windowHeight = $window.innerHeight;
});
}
};
}])
.controller('RoomController', ['$scope', '$http', '$timeout', '$routeParams', '$location', 'matrixService', 'eventStreamService', 'eventHandlerService',
function($scope, $http, $timeout, $routeParams, $location, matrixService, eventStreamService, eventHandlerService) {
'use strict';