# center.tcl - Center a window on the screen or over another window
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# center.tcl - Center a window on the screen or over another window
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# Copyright (C) 1997, 1998, 2001 Red Hat, Inc.
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# Copyright (C) 1997, 1998, 2001 Red Hat, Inc.
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# Written by Tom Tromey <tromey@cygnus.com>.
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# Written by Tom Tromey <tromey@cygnus.com>.
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# Call this after the TOPLEVEL has been filled in, but before it has
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# Call this after the TOPLEVEL has been filled in, but before it has
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# been mapped. This proc will center the toplevel on the screen or
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# been mapped. This proc will center the toplevel on the screen or
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# over another window.
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# over another window.
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proc center_window {top args} {
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proc center_window {top args} {
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parse_args {{over ""}}
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parse_args {{over ""}}
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update idletasks
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update idletasks
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if {$over != ""} {
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if {$over != ""} {
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set cx [expr {int ([winfo rootx $over] + [winfo width $over] / 2)}]
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set cx [expr {int ([winfo rootx $over] + [winfo width $over] / 2)}]
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set cy [expr {int ([winfo rooty $over] + [winfo height $over] / 2)}]
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set cy [expr {int ([winfo rooty $over] + [winfo height $over] / 2)}]
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set x [expr {$cx - int ([winfo reqwidth $top] / 2)}]
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set x [expr {$cx - int ([winfo reqwidth $top] / 2)}]
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set y [expr {$cy - int ([winfo reqheight $top] / 2)}]
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set y [expr {$cy - int ([winfo reqheight $top] / 2)}]
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} else {
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} else {
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set x [expr {int (([winfo screenwidth $top] - [winfo reqwidth $top]) / 2)}]
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set x [expr {int (([winfo screenwidth $top] - [winfo reqwidth $top]) / 2)}]
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set y [expr {int (([winfo screenheight $top] - [winfo reqheight $top]) / 2)}]
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set y [expr {int (([winfo screenheight $top] - [winfo reqheight $top]) / 2)}]
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}
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}
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wm geometry $top +${x}+${y}
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wm geometry $top +${x}+${y}
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wm positionfrom $top user
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wm positionfrom $top user
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# We run this update here because Tk updates toplevel geometry
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# We run this update here because Tk updates toplevel geometry
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# (position) info in an idle handler on Windows, but doesn't force
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# (position) info in an idle handler on Windows, but doesn't force
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# the handler to run before mapping the window.
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# the handler to run before mapping the window.
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update idletasks
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update idletasks
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}
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}
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