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