tray-item-message

Arguments: tray-item window message

This generic function is called whenever a mouse event occurs over the icon for a tray-item in the system tray. It is not useful for an application to call this function, but an application may define tray-item-message methods to handle mouse events on its tray-items in some arbitrary way. The default method that specializes on tray-item and basic-pane does nothing.

tray-item will be the tray-item whose icon was under the mouse cursor when the mouse event occurred. An application would typically define and use a subclass of the built-in tray-item class so that it can specialize a tray-item-message method on that subclass.

window will be the window that was specified in the most recent call to add-tray-item for this tray-item. This is the window that receives the messages for this tray-item, and therefore tray-item-message will be called in the creation-process of that window.

message will be the value of one of the message constants mouse-moved, mouse-left-down, mouse-left-up, mouse-double-click, mouse-middle-down, mouse-middle-up, mouse-right-down, or mouse-right-up.

Here is a problem on Windows that we apparently cannot avoid: If your tray-item-message method calls pop-up-menu when handling a down click such as mouse-right-down, and the tray item's associated window was the selected window before the click was done, then the call to pop-up-menu returns immediately without letting the user choose a menu-item. Therefore, if the associated window is a visible window (which therefore might be selected), you should pop up menus only on up clicks such as mouse-right-up.

See the description of the tray-item class for an example.

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This page was not revised from the 8.2 page.
Created 2012.5.30.