Provided by: perl-tk_804.033-1build1_amd64 bug


       Tk::Wm::Popup - popup dialog windows.


            -popover    => 'cursor' | $widget | undef,
            -overanchor => c | n | ne | e | se | s | sw | w | nw,
            -popanchor  => c | n | ne | e | se | s | sw | w | nw,


       You've probably had occasion to use a Dialog (or DialogBox) widget. These widgets are
       derived from a Toplevel (which is a subclass of Tk::Wm, the window manager) and spend most
       of their time in a withdrawn state. It's also common to use Toplevels as containers for
       custom built popup windows.  Menus, too, are dialogs derived from the window manager
       class. For this discussion, we'll use the simple term dialog to refer any widget that pops
       up and awaits user interaction, whether it be a Menu, a special purpose Toplevel, or any
       of the dialog-type widgets, including, but not limited to, ColorEditor, Dialog, DialogBox,
       ErrorDialog, FileSelect, FBox, getOpenFile and getSaveFile.

       When it's time to display these dialogs, we call the Perl/Tk window manager Popup method.
       Popup accepts three special purpose options that specify placement information in high-
       level terms rather than numerical coordinates. It is Popup's responsibility to take our
       human specifications and turn them into actual screen coordinates before displaying the

       We can direct the dialog to appear in two general locations, either over another window
       (e.g. the root window (screen) or a particular widget), or over the cursor. This is called
       the popover location. Once we've made this decision we can further refine the exact
       placement of the dialog relative to the popover location by specifying the intersection of
       two anchor points. The popanchor point is associated with the dialog and the overanchor
       point is associated with the popover location (whether it be a window or the cursor). The
       point where the two anchor points coincide is the popup locus. Anchor points are string
       values and can be c (for center), or any of the eight cardinal compass points: n, ne, e,
       se, s, sw, w or nw.

       For example, if -popover specifies a widget, -popanchor is sw, and -overanchor is ne, the
       the dialog's southwest corner pops up at the widget's northeast corner.


       The options recognized by Popup are as follows:

           Specifies whether the dialog "pops over" a window or the cursor.  It may be the string
           cursor, a widget reference, or undef for the root window.

           Specifies the anchor point of the dialog.  For instance, if e is specified, the right
           side of the dialog is the anchor.

           Specifies where the dialog should anchor relative to the popover location. For
           instance, if e is specified the dialog appears over the right side of the popover
           location and if it's ne the the dialog is positioned at the upper-right corner of the
           popover location.


       Nick Ing-Simmons, Steve Lidie

       This code is distributed under the same terms as Perl.