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| # | |
| # tkdnd_utils.tcl -- | |
| # | |
| # This file implements some utility procedures that are used by the TkDND | |
| # package. | |
| # | |
| # This software is copyrighted by: | |
| # George Petasis, National Centre for Scientific Research "Demokritos", | |
| # Aghia Paraskevi, Athens, Greece. | |
| # e-mail: petasis@iit.demokritos.gr | |
| # | |
| # The following terms apply to all files associated | |
| # with the software unless explicitly disclaimed in individual files. | |
| # | |
| # The authors hereby grant permission to use, copy, modify, distribute, | |
| # and license this software and its documentation for any purpose, provided | |
| # that existing copyright notices are retained in all copies and that this | |
| # notice is included verbatim in any distributions. No written agreement, | |
| # license, or royalty fee is required for any of the authorized uses. | |
| # Modifications to this software may be copyrighted by their authors | |
| # and need not follow the licensing terms described here, provided that | |
| # the new terms are clearly indicated on the first page of each file where | |
| # they apply. | |
| # | |
| # IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY PARTY | |
| # FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES | |
| # ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, OR ANY | |
| # DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED OF THE | |
| # POSSIBILITY OF SUCH DAMAGE. | |
| # | |
| # THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES, | |
| # INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, | |
| # FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. THIS SOFTWARE | |
| # IS PROVIDED ON AN "AS IS" BASIS, AND THE AUTHORS AND DISTRIBUTORS HAVE | |
| # NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR | |
| # MODIFICATIONS. | |
| # | |
| package require tkdnd | |
| namespace eval ::tkdnd { | |
| namespace eval utils { | |
| };# namespace ::tkdnd::utils | |
| namespace eval text { | |
| variable _drag_tag tkdnd::drag::selection::tag | |
| variable _state {} | |
| variable _drag_source_widget {} | |
| variable _drop_target_widget {} | |
| variable _now_dragging 0 | |
| };# namespace ::tkdnd::text | |
| };# namespace ::tkdnd | |
| bind TkDND_Drag_Text1 <ButtonPress-1> {tkdnd::text::_begin_drag clear 1 %W %s %X %Y %x %y} | |
| bind TkDND_Drag_Text1 <B1-Motion> {tkdnd::text::_begin_drag motion 1 %W %s %X %Y %x %y} | |
| bind TkDND_Drag_Text1 <B1-Leave> {tkdnd::text::_TextAutoScan %W %x %y} | |
| bind TkDND_Drag_Text1 <ButtonRelease-1> {tkdnd::text::_begin_drag reset 1 %W %s %X %Y %x %y} | |
| bind TkDND_Drag_Text2 <ButtonPress-2> {tkdnd::text::_begin_drag clear 2 %W %s %X %Y %x %y} | |
| bind TkDND_Drag_Text2 <B2-Motion> {tkdnd::text::_begin_drag motion 2 %W %s %X %Y %x %y} | |
| bind TkDND_Drag_Text2 <ButtonRelease-2> {tkdnd::text::_begin_drag reset 2 %W %s %X %Y %x %y} | |
| bind TkDND_Drag_Text3 <ButtonPress-3> {tkdnd::text::_begin_drag clear 3 %W %s %X %Y %x %y} | |
| bind TkDND_Drag_Text3 <B3-Motion> {tkdnd::text::_begin_drag motion 3 %W %s %X %Y %x %y} | |
| bind TkDND_Drag_Text3 <ButtonRelease-3> {tkdnd::text::_begin_drag reset 3 %W %s %X %Y %x %y} | |
| # ---------------------------------------------------------------------------- | |
| # Command tkdnd::text::drag_source | |
| # ---------------------------------------------------------------------------- | |
| proc ::tkdnd::text::drag_source { mode path { types DND_Text } { event 1 } { tagprefix TkDND_Drag_Text } { tag sel } } { | |
| switch -exact -- $mode { | |
| register { | |
| $path tag bind $tag <ButtonPress-${event}> \ | |
| "tkdnd::text::_begin_drag press ${event} %W %s %X %Y %x %y" | |
| ## Set a binding to the widget, to put selection as data... | |
| bind $path <<DragInitCmd>> "::tkdnd::text::DragInitCmd $path {%t} $tag" | |
| ## Set a binding to the widget, to remove selection if action is move... | |
| bind $path <<DragEndCmd>> "::tkdnd::text::DragEndCmd $path %A $tag" | |
| } | |
| unregister { | |
| $path tag bind $tag <ButtonPress-${event}> {} | |
| bind $path <<DragInitCmd>> {} | |
| bind $path <<DragEndCmd>> {} | |
| } | |
| } | |
| ::tkdnd::drag_source $mode $path $types $event $tagprefix | |
| };# ::tkdnd::text::drag_source | |
| # ---------------------------------------------------------------------------- | |
| # Command tkdnd::text::drop_target | |
| # ---------------------------------------------------------------------------- | |
| proc ::tkdnd::text::drop_target { mode path { types DND_Text } } { | |
| switch -exact -- $mode { | |
| register { | |
| bind $path <<DropPosition>> "::tkdnd::text::DropPosition $path %X %Y %A %a %m" | |
| bind $path <<Drop>> "::tkdnd::text::Drop $path %D %X %Y %A %a %m" | |
| } | |
| unregister { | |
| bind $path <<DropEnter>> {} | |
| bind $path <<DropPosition>> {} | |
| bind $path <<DropLeave>> {} | |
| bind $path <<Drop>> {} | |
| } | |
| } | |
| ::tkdnd::drop_target $mode $path $types | |
| };# ::tkdnd::text::drop_target | |
| # ---------------------------------------------------------------------------- | |
| # Command tkdnd::text::DragInitCmd | |
| # ---------------------------------------------------------------------------- | |
| proc ::tkdnd::text::DragInitCmd { path { types DND_Text } { tag sel } { actions { copy move } } } { | |
| ## Save the selection indices... | |
| variable _drag_source_widget | |
| variable _drop_target_widget | |
| set _drag_source_widget $path | |
| set _drop_target_widget {} | |
| _save_selection $path $tag | |
| list $actions $types [$path get $tag.first $tag.last] | |
| };# ::tkdnd::text::DragInitCmd | |
| # ---------------------------------------------------------------------------- | |
| # Command tkdnd::text::DragEndCmd | |
| # ---------------------------------------------------------------------------- | |
| proc ::tkdnd::text::DragEndCmd { path action { tag sel } } { | |
| variable _drag_source_widget | |
| variable _drop_target_widget | |
| set _drag_source_widget {} | |
| set _drop_target_widget {} | |
| _restore_selection $path $tag | |
| switch -exact -- $action { | |
| move { | |
| ## Delete the original selected text... | |
| variable _selection_first | |
| variable _selection_last | |
| $path delete $_selection_first $_selection_last | |
| } | |
| } | |
| };# ::tkdnd::text::DragEndCmd | |
| # ---------------------------------------------------------------------------- | |
| # Command tkdnd::text::DropPosition | |
| # ---------------------------------------------------------------------------- | |
| proc ::tkdnd::text::DropPosition { path X Y action actions keys} { | |
| variable _drag_source_widget | |
| variable _drop_target_widget | |
| set _drop_target_widget $path | |
| ## This check is primitive, a more accurate one is needed! | |
| if {$path eq $_drag_source_widget} { | |
| ## This is a drag within the same widget! Set action to move... | |
| if {"move" in $actions} {set action move} | |
| } | |
| incr X -[winfo rootx $path] | |
| incr Y -[winfo rooty $path] | |
| $path mark set insert @$X,$Y; update | |
| return $action | |
| };# ::tkdnd::text::DropPosition | |
| # ---------------------------------------------------------------------------- | |
| # Command tkdnd::text::Drop | |
| # ---------------------------------------------------------------------------- | |
| proc ::tkdnd::text::Drop { path data X Y action actions keys } { | |
| incr X -[winfo rootx $path] | |
| incr Y -[winfo rooty $path] | |
| $path mark set insert @$X,$Y | |
| $path insert [$path index insert] $data | |
| return $action | |
| };# ::tkdnd::text::Drop | |
| # ---------------------------------------------------------------------------- | |
| # Command tkdnd::text::_save_selection | |
| # ---------------------------------------------------------------------------- | |
| proc ::tkdnd::text::_save_selection { path tag} { | |
| variable _drag_tag | |
| variable _selection_first | |
| variable _selection_last | |
| variable _selection_tag $tag | |
| set _selection_first [$path index $tag.first] | |
| set _selection_last [$path index $tag.last] | |
| $path tag add $_drag_tag $_selection_first $_selection_last | |
| $path tag configure $_drag_tag \ | |
| -background [$path tag cget $tag -background] \ | |
| -foreground [$path tag cget $tag -foreground] | |
| };# tkdnd::text::_save_selection | |
| # ---------------------------------------------------------------------------- | |
| # Command tkdnd::text::_restore_selection | |
| # ---------------------------------------------------------------------------- | |
| proc ::tkdnd::text::_restore_selection { path tag} { | |
| variable _drag_tag | |
| variable _selection_first | |
| variable _selection_last | |
| $path tag delete $_drag_tag | |
| $path tag remove $tag 0.0 end | |
| #$path tag add $tag $_selection_first $_selection_last | |
| };# tkdnd::text::_restore_selection | |
| # ---------------------------------------------------------------------------- | |
| # Command tkdnd::text::_begin_drag | |
| # ---------------------------------------------------------------------------- | |
| proc ::tkdnd::text::_begin_drag { event button source state X Y x y } { | |
| variable _drop_target_widget | |
| variable _state | |
| # puts "::tkdnd::text::_begin_drag $event $button $source $state $X $Y $x $y" | |
| switch -exact -- $event { | |
| clear { | |
| switch -exact -- $_state { | |
| press { | |
| ## Do not execute other bindings, as they will erase selection... | |
| return -code break | |
| } | |
| } | |
| set _state clear | |
| } | |
| motion { | |
| variable _now_dragging | |
| if {$_now_dragging} {return -code break} | |
| if { [string equal $_state "press"] } { | |
| variable _x0; variable _y0 | |
| if { abs($_x0-$X) > ${::tkdnd::_dx} || abs($_y0-$Y) > ${::tkdnd::_dy} } { | |
| set _state "done" | |
| set _drop_target_widget {} | |
| set _now_dragging 1 | |
| set code [catch { | |
| ::tkdnd::_init_drag $button $source $state $X $Y $x $y | |
| } info options] | |
| set _drop_target_widget {} | |
| set _now_dragging 0 | |
| if {$code != 0} { | |
| ## Something strange occurred... | |
| return -options $options $info | |
| } | |
| } | |
| return -code break | |
| } | |
| set _state clear | |
| } | |
| press { | |
| variable _x0; variable _y0 | |
| set _x0 $X | |
| set _y0 $Y | |
| set _state "press" | |
| } | |
| reset { | |
| set _state {} | |
| } | |
| } | |
| if {$source eq $_drop_target_widget} {return -code break} | |
| return -code continue | |
| };# tkdnd::text::_begin_drag | |
| proc tkdnd::text::_TextAutoScan {w x y} { | |
| variable _now_dragging | |
| if {$_now_dragging} {return -code break} | |
| return -code continue | |
| };# tkdnd::text::_TextAutoScan | |