**uib-collapse** provides a simple way to hide and show an element with a css transition ### uib-collapse settings * `collapsed()` $ - An optional expression called after the element finished collapsing. * `collapsing()` $ - An optional expression called before the element begins collapsing. If the expression returns a promise, animation won't start until the promise resolves. If the returned promise is rejected, collapsing will be cancelled. * `expanded()` $ - An optional expression called after the element finished expanding. * `expanding()` $ - An optional expression called before the element begins expanding. If the expression returns a promise, animation won't start until the promise resolves. If the returned promise is rejected, expanding will be cancelled. * `uib-collapse` $ _(Default: `false`)_ - Whether the element should be collapsed or not. * `horizontal` $ - An optional attribute that permit to collapse horizontally.