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# -*- mode: TCL; fill-column: 75; tab-width: 8; coding: iso-latin-1-unix -*- # # $Id: DragDrop.tcl,v 1.4 2001/12/09 05:04:02 idiscovery Exp $ # # DragDrop.tcl --- # # Implements drag+drop for Tix widgets. # # Copyright (c) 1993-1999 Ioi Kim Lam. # Copyright (c) 2000-2001 Tix Project Group. # # See the file "license.terms" for information on usage and redistribution # of this file, and for a DISCLAIMER OF ALL WARRANTIES. # tixClass tixDragDropContext { -superclass {} -classname TixDragDropContext -method { cget configure drag drop set startdrag } -flag { -command -source } -configspec { {-command ""} {-source ""} } } proc tixDragDropContext:Constructor {w} { upvar #0 $w data } #---------------------------------------------------------------------- # Private methods # #---------------------------------------------------------------------- proc tixDragDropContext:CallCommand {w target command X Y} { upvar #0 $w data set x [expr $X-[winfo rootx $target]] set y [expr $Y-[winfo rooty $target]] regsub %x $command $x command regsub %y $command $y command regsub %X $command $X command regsub %Y $command $Y command regsub %W $command $target command regsub %S $command [list $data(-command)] command eval $command } proc tixDragDropContext:Send {w target event X Y} { upvar #0 $w data global tixDrop foreach tag [tixDropBindTags $target] { if {[info exists tixDrop($tag,$event)]} { tixDragDropContext:CallCommand $w $target \ $tixDrop($tag,$event) $X $Y } } } #---------------------------------------------------------------------- # set -- # # Set the "small data" of the type supported by the source widget #---------------------------------------------------------------------- proc tixDragDropContext:set {w type data} { } #---------------------------------------------------------------------- # startdrag -- # # Start the dragging action #---------------------------------------------------------------------- proc tixDragDropContext:startdrag {w x y} { upvar #0 $w data set data(oldTarget) "" $data(-source) config -cursor "[tix getbitmap drop] black" tixDragDropContext:drag $w $x $y } #---------------------------------------------------------------------- # drag -- # # Continue the dragging action #---------------------------------------------------------------------- proc tixDragDropContext:drag {w X Y} { upvar #0 $w data global tixDrop set target [winfo containing -displayof $w $X $Y] if {$target != $data(oldTarget)} { if {$data(oldTarget) != ""} { tixDragDropContext:Send $w $data(oldTarget) <Out> $X $Y } if {$target != ""} { tixDragDropContext:Send $w $target <In> $X $Y } set data(oldTarget) $target } if {$target != ""} { tixDragDropContext:Send $w $target <Over> $X $Y } } proc tixDragDropContext:drop {w X Y} { upvar #0 $w data global tixDrop set target [winfo containing -displayof $w $X $Y] if {$target != ""} { tixDragDropContext:Send $w $target <Drop> $X $Y } if {$data(-source) != ""} { $data(-source) config -cursor "" } set data(-source) "" } #---------------------------------------------------------------------- # Public Procedures -- This is NOT a member of the tixDragDropContext # class! # # parameters : # $w: who wants to start dragging? (currently ignored) #---------------------------------------------------------------------- proc tixGetDragDropContext {w} { global tixDD if {[info exists tixDD]} { return tixDD } return [tixDragDropContext tixDD] } proc tixDropBind {w event command} { global tixDrop set tixDrop($w) 1 set tixDrop($w,$event) $command } proc tixDropBindTags {w args} { global tixDropTags if {$args == ""} { if {[info exists tixDropTags($w)]} { return $tixDropTags($w) } else { return [list [winfo class $w] $w] } } else { set tixDropTags($w) $args } }