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Mouse-Tracking and Cursor-Update Events

Mouse-tracking messages are sent to an object when the mouse pointer (without a mouse button being pressed) enters and exits a region of a window. This region is known as a tracking rectangle or tracking area. Mouse tracking enables the view owning the region to respond, for example, by drawing a highlight color or displaying a tool tip. Cursor-update events are a special kind of mouse-tracking event that the Application Kit handles automatically. When the mouse pointer enters a cursor rectangle, the Application Kit displays a cursor image appropriate to the type of view under the rectangle; for example, when a mouse pointer enters a text view, an I-beam cursor is displayed instead.

The sections in this chapter describe how you set up tracking rectangles and respond to mouse-tracking events. They also discuss how to specify and manage the rectangles for cursor-update events.

Contents:

Handling Mouse-Tracking Events
Managing Cursor-Update Events

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