mouse-in

Arguments: object buttons mouse-out-object

This generic function is called when the user moves the mouse cursor into a window, dialog-item, or hotspot. An application may add methods to this generic function to respond to mouse events in these objects. The built-in methods should not be overridden, though, because they perform some standard internal tasks.

object is the window, dialog-item, or hotspot being entered.

buttons is an integer indicating which mouse buttons and shift keys were down when the event occurred. The value is the result of applying logior to the values of the following bit-flag variables:

• left-mouse-button
• middle-mouse-button
• right-mouse-button
• first-x-button (see *ignore-mouse-x-buttons*)
• second-x-button (see *ignore-mouse-x-buttons*),
• shift-key
• control-key
• alt-key

Other bits might be turned on as well, so functions such as logtest should be used to determine whether a particular mouse button or shift key was down; for example,

(logtest left-mouse-button buttons) 

will return true if and only if the left mouse button was down. For "down" events, the value includes the button or key being pressed now; for "up" events, the value does not include the button or key being released.

mouse-out-object is the window, dialog-item, or hotspot of the same general type as the object being moved into, if any, that the mouse cursor was over immediately before entering the object.

See cg-events.htm for information about event handling in Common Graphics.

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This page was not revised from the 8.1 page.
Created 2010.1.21.