| # Scenic input |
| |
| Many input modalities are associated with a particular [View][view-glossary]. |
| Events that are described in View coordinates (touchscreen, mouse) are handled |
| by Scenic, while others (keyboard, touchpad gestures) rely on the View Tree |
| topology but are not directly dispatched by Scenic. |
| |
| ## Pointer events dispatched to a View |
| |
| Scenic handles input modalities that are described in View coordinates. For |
| example, Scenic dispatches touchscreen events and mouse events to a particular |
| View, and these events have a concrete position in that View's coordinate |
| system. Commonly, we call these "pointer events". |
| |
| ## View target determined with hit-testing |
| |
| Scenic must decide which View should receive pointer events. Typically, |
| [hit-testing][hit-testing] is used to find the geometrically top most View, |
| which Scenic then uses as the target of event dispatch. |
| |
| [view-glossary]: /docs/glossary#view |
| [hit-testing]: https://en.wikipedia.org/wiki/Hit-testing |
