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30 lines
759 B
Tcl
30 lines
759 B
Tcl
# canvas.tcl - Handy canvas-related commands.
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# Copyright (C) 1997 Cygnus Solutions.
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# Written by Tom Tromey <tromey@cygnus.com>.
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# Set scroll region on canvas.
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proc set_scroll_region {canvas} {
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set bbox [$canvas bbox all]
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if {[llength $bbox]} then {
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set sr [lreplace $bbox 0 1 0 0]
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} else {
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set sr {0 0 0 0}
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}
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# Don't include borders in the scrollregion.
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set delta [expr {2 * ([$canvas cget -borderwidth]
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+ [$canvas cget -highlightthickness])}]
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set ww [winfo width $canvas]
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if {[lindex $sr 2] < $ww} then {
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set sr [lreplace $sr 2 2 [expr {$ww - $delta}]]
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}
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set wh [winfo height $canvas]
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if {[lindex $sr 3] < $wh} then {
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set sr [lreplace $sr 3 3 [expr {$wh - $delta}]]
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}
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$canvas configure -scrollregion $sr
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}
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