Can you explain the principle of hit testing?

Hit Test is the process of determining which widget or user interface element is under a specific point, for example, when touching the screen.

In Flutter, when interacting with the screen, the system traverses the widget tree from the root and checks which widgets contain the touch coordinates. This process helps to identify which widget should handle the event (such as a tap).

Example:

• The user taps on the screen.
• Flutter performs a hit test, traversing the widget tree.
• The deepest widget that contains the touch point and can respond to the event is identified.
• The event is passed to this widget for handling.

Thus, hit test ensures the correct distribution of input events among widgets.