Google Maps API shows a message over the map when a user scrolls with mouse over the map.
The message advises the user to press the Control key while scrolling with the mouse over map. This is a very nice solution to preserve normal page scroll with the mouse.
Is this possible in OpenLayers 3?
Really there are two behaviors that we want to achieve:
How to detect that the user is doing scroll on the map with the mouse and show an alert that you must press control key?
How can you make it so the zoom on the map can only be done by pressing control in addition to scrolling with the mouse?