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- # DragDrop.tcl ---
- #
- # Implements drag+drop for Tix widgets.
- #
- # Copyright (c) 1996, Expert Interface Technologies
- #
- # 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 $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 $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
- }
- }
-