Bug #25 fixed

Changelog

@@ -1,11 +1,15 @@
 2019-02-03  Petasis George  <petasis@iit.demokritos.gr>
+	* demos/dndSpy.tcl: Modified demo to also show data to be dropped
+	during drag.
+
 	* win/OleDND.h:
+	* unix/TkDND_XDND.c
 	* library/tkdnd_generic.tcl:
 	* library/tkdnd_macosx.tcl:
 	* library/tkdnd_unix.tcl:
 	* library/tkdnd_windows.tcl: Provided a solution for bug #25.
-	Under Windows, the dropped data is available for the <<DropEnter>> and
-	<<DropPosition>> events.
+	Under Windows and Unix, the dropped data is available for the
+	<<DropEnter>> and <<DropPosition>> events (%D specifier).
 
 2018-12-23  Petasis George  <petasis@iit.demokritos.gr>
 	* .travis.yml: make install & deployment to GitHub.

demos/dndSpy.tcl

@@ -32,13 +32,17 @@ if {[catch {package require tkdnd} version]} {
 
 ## Place a listbox. This will be our drop target, which will also display the
 ## types supported by the drag source...
-pack [listbox .typeList -height 25 -width 50] -side left -padx 2 -pady 2 \
-        -fill y -expand 0
+listbox .typeList -height 20 -width 50
 ## A text widget to display the dropped data...
-pack [text .data -height 25 -width 80] -side left -padx 2 -pady 2 -fill both \
-        -expand 1
+text .data -height 20 -width 60
 .data insert end $package_info
-pack [button .exit -text {  Exit  } -command exit] -side bottom -pady 5 -padx 5
+text .position -height 5 -width 50
+button .exit -text {  Exit  } -command exit
+
+grid .typeList .data - -sticky snew -padx 2 -pady 2
+grid columnconfigure . 1 -weight 1
+grid columnconfigure . 2 -weight 1
+grid .position - .exit -sticky snew -padx 2 -pady 2
 
 proc FillTypeListbox {listbox types type codes code actions action mods} {
     $listbox delete 0 end
@@ -65,6 +69,13 @@ proc FillTypeListbox {listbox types type codes code actions action mods} {
     $listbox insert end " * Modifiers: \"$mods\""
     $listbox itemconfigure end -foreground brown -background $::bg
 }
+proc FillPosition {text X Y data} {
+  $text configure -state normal
+  $text delete 1.0 end
+  $text insert end "Position: (x=$X, y=$Y) Data Preview:\n"
+  $text insert end \"$data\"
+  $text configure -state disabled
+};# FillPosition
 proc FillData {text Data type code} {
     $text configure -state normal
     $text delete 1.0 end
@@ -102,6 +113,7 @@ set abg #8fbc8f
 set type *
 dnd bindtarget .typeList $type <DragEnter> ".typeList configure -bg $abg
 FillTypeListbox .typeList %t %T %c %C %a %A %m
+FillPosition    .position %X %Y %D
 return \[lindex %a 0\]"
 dnd bindtarget .typeList $type <Drag> \
         [dnd bindtarget .typeList $type <DragEnter>]

library/tkdnd_unix.tcl

@@ -60,11 +60,14 @@ namespace eval xdnd {
 # ----------------------------------------------------------------------------
 #  Command xdnd::HandleXdndEnter
 # ----------------------------------------------------------------------------
-proc xdnd::HandleXdndEnter { path drag_source typelist { data {} } } {
+proc xdnd::HandleXdndEnter { path drag_source typelist time { data {} } } {
   variable _pressedkeys
   variable _actionlist
+  variable _typelist
   set _pressedkeys 1
   set _actionlist  { copy move link ask private }
+  set _typelist    $typelist
+  # puts "xdnd::HandleXdndEnter: $time"
   ::tkdnd::generic::SetDroppedData $data
   ::tkdnd::generic::HandleEnter $path $drag_source $typelist $typelist \
            $_actionlist $_pressedkeys
@@ -73,10 +76,16 @@ proc xdnd::HandleXdndEnter { path drag_source typelist { data {} } } {
 # ----------------------------------------------------------------------------
 #  Command xdnd::HandleXdndPosition
 # ----------------------------------------------------------------------------
-proc xdnd::HandleXdndPosition { drop_target rootX rootY {drag_source {}} } {
+proc xdnd::HandleXdndPosition { drop_target rootX rootY time {drag_source {}} } {
   variable _pressedkeys
+  variable _typelist
   variable _last_mouse_root_x; set _last_mouse_root_x $rootX
   variable _last_mouse_root_y; set _last_mouse_root_y $rootY
+  # puts "xdnd::HandleXdndPosition: $time"
+  ## Get the dropped data...
+  catch {
+    ::tkdnd::generic::SetDroppedData [GetPositionData $drop_target $_typelist $time]
+  }
   ::tkdnd::generic::HandlePosition $drop_target $drag_source \
                                    $_pressedkeys $rootX $rootY
 };# xdnd::HandleXdndPosition
@@ -96,18 +105,27 @@ proc xdnd::HandleXdndDrop { time } {
   variable _last_mouse_root_x
   variable _last_mouse_root_y
   ## Get the dropped data...
-  ::tkdnd::generic::SetDroppedData [GetDroppedData $time]
+  ::tkdnd::generic::SetDroppedData [GetDroppedData \
+    [::tkdnd::generic::GetDragSource] [::tkdnd::generic::GetDropTarget] \
+    [::tkdnd::generic::GetDragSourceCommonTypes] $time]
   ::tkdnd::generic::HandleDrop {} {} $_pressedkeys \
                                $_last_mouse_root_x $_last_mouse_root_y $time
 };# xdnd::HandleXdndDrop
 
 # ----------------------------------------------------------------------------
-#  Command xdnd::_GetDroppedData
+#  Command xdnd::GetPositionData
+# ----------------------------------------------------------------------------
+proc xdnd::GetPositionData { drop_target typelist time } {
+  foreach {drop_target common_drag_source_types common_drop_target_types} \
+    [::tkdnd::generic::FindWindowWithCommonTypes $drop_target $typelist] {break}
+  GetDroppedData [::tkdnd::generic::GetDragSource] $drop_target \
+    $common_drag_source_types $time
+};# xdnd::GetPositionData
+
+# ----------------------------------------------------------------------------
+#  Command xdnd::GetDroppedData
 # ----------------------------------------------------------------------------
-proc xdnd::GetDroppedData { time } {
-  set _drag_source              [::tkdnd::generic::GetDragSource]
-  set _drop_target              [::tkdnd::generic::GetDropTarget]
-  set _common_drag_source_types [::tkdnd::generic::GetDragSourceCommonTypes]
+proc xdnd::GetDroppedData { _drag_source _drop_target _common_drag_source_types time } {
   if {![llength $_common_drag_source_types]} {
     error "no common data types between the drag source and drop target widgets"
   }