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3.1.5 The Window announcements hierarchy in Pharo

Please note that the Window announcement hierarchy is only available starting from Pharo 1.1

Each application using Announcements usually comes with its specific set of Announcement subclasses. Let's take for example the case of windows events in Pharo. We can actually distinguish two kinds of announcer for window events:

  1. World announcer, which sends events about new window opening and window closing
  2. one announcer per window, which sends events such as resizing, collapsed, moved...

The superclass for window events is:

WindowAnnouncement
WindowActivated
WindowClosed
WindowCollapsed
WindowExpanded
WindowMoved
WindowOpened
WindowResizing
WindowScrolling

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