File size: 16,121 Bytes
c2dad70
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
#
# tkdnd.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: [email protected]
#
# 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 Tk

namespace eval ::tkdnd {
  variable _topw ".drag"
  variable _tabops
  variable _state
  variable _x0
  variable _y0
  variable _platform_namespace
  variable _drop_file_temp_dir
  variable _auto_update 1
  variable _dx 3 ;# The difference in pixels before a drag is initiated.
  variable _dy 3 ;# The difference in pixels before a drag is initiated.

  variable _windowingsystem

  bind TkDND_Drag1 <ButtonPress-1> {tkdnd::_begin_drag press  1 %W %s %X %Y %x %y}
  bind TkDND_Drag1 <B1-Motion>     {tkdnd::_begin_drag motion 1 %W %s %X %Y %x %y}
  bind TkDND_Drag2 <ButtonPress-2> {tkdnd::_begin_drag press  2 %W %s %X %Y %x %y}
  bind TkDND_Drag2 <B2-Motion>     {tkdnd::_begin_drag motion 2 %W %s %X %Y %x %y}
  bind TkDND_Drag3 <ButtonPress-3> {tkdnd::_begin_drag press  3 %W %s %X %Y %x %y}
  bind TkDND_Drag3 <B3-Motion>     {tkdnd::_begin_drag motion 3 %W %s %X %Y %x %y}

  # ----------------------------------------------------------------------------
  #  Command tkdnd::initialise: Initialise the TkDND package.
  # ----------------------------------------------------------------------------
  proc initialise { dir PKG_LIB_FILE PACKAGE_NAME} {
    variable _platform_namespace
    variable _drop_file_temp_dir
    variable _windowingsystem
    global env

    switch [tk windowingsystem] {
      x11 {
        set _windowingsystem x11
      }
      win32 -
      windows {
        set _windowingsystem windows
      }
      aqua  {
        set _windowingsystem aqua
      }
      default {
        error "unknown Tk windowing system"
      }
    }

    ## Get User's home directory: We try to locate the proper path from a set of
    ## environmental variables...
    foreach var {HOME HOMEPATH USERPROFILE ALLUSERSPROFILE APPDATA} {
      if {[info exists env($var)]} {
        if {[file isdirectory $env($var)]} {
          set UserHomeDir $env($var)
          break
        }
      }
    }

    ## Should use [tk windowingsystem] instead of tcl platform array:
    ## OS X returns "unix," but that's not useful because it has its own
    ## windowing system, aqua
    ## Under windows we have to also combine HOMEDRIVE & HOMEPATH...
    if {![info exists UserHomeDir] &&
        [string equal $_windowingsystem windows] &&
        [info exists env(HOMEDRIVE)] && [info exists env(HOMEPATH)]} {
      if {[file isdirectory $env(HOMEDRIVE)$env(HOMEPATH)]} {
        set UserHomeDir $env(HOMEDRIVE)$env(HOMEPATH)
      }
    }
    ## Have we located the needed path?
    if {![info exists UserHomeDir]} {
      set UserHomeDir [pwd]
    }
    set UserHomeDir [file normalize $UserHomeDir]

    ## Try to locate a temporary directory...
    foreach var {TKDND_TEMP_DIR TEMP TMP} {
      if {[info exists env($var)]} {
        if {[file isdirectory $env($var)] && [file writable $env($var)]} {
          set _drop_file_temp_dir $env($var)
          break
        }
      }
    }
    if {![info exists _drop_file_temp_dir]} {
      foreach _dir [list "$UserHomeDir/Local Settings/Temp" \
                         "$UserHomeDir/AppData/Local/Temp" \
                         /tmp \
                         C:/WINDOWS/Temp C:/Temp C:/tmp \
                         D:/WINDOWS/Temp D:/Temp D:/tmp] {
        if {[file isdirectory $_dir] && [file writable $_dir]} {
          set _drop_file_temp_dir $_dir
          break
        }
      }
    }
    if {![info exists _drop_file_temp_dir]} {
      set _drop_file_temp_dir $UserHomeDir
    }
    set _drop_file_temp_dir [file native $_drop_file_temp_dir]

    source $dir/tkdnd_generic.tcl
    switch $_windowingsystem {
      x11 {
        source $dir/tkdnd_unix.tcl
        set _platform_namespace xdnd
      }
      win32 -
      windows {
        source $dir/tkdnd_windows.tcl
        set _platform_namespace olednd
      }
      aqua  {
        source $dir/tkdnd_macosx.tcl
        set _platform_namespace macdnd
      }
      default {
        error "unknown Tk windowing system"
      }
    }
    load $dir/$PKG_LIB_FILE $PACKAGE_NAME
    source $dir/tkdnd_compat.tcl
    ${_platform_namespace}::initialise
  };# initialise

  proc GetDropFileTempDirectory { } {
    variable _drop_file_temp_dir
    return $_drop_file_temp_dir
  }
  proc SetDropFileTempDirectory { dir } {
    variable _drop_file_temp_dir
    set _drop_file_temp_dir $dir
  }

};# namespace ::tkdnd

# ----------------------------------------------------------------------------
#  Command tkdnd::drag_source
# ----------------------------------------------------------------------------
proc ::tkdnd::drag_source { mode path { types {} } { event 1 }
                                      { tagprefix TkDND_Drag } } {
  set tags [bindtags $path]
  set idx  [lsearch $tags ${tagprefix}$event]
  switch -- $mode {
    register {
      if { $idx != -1 } {
        ## No need to do anything!
        # bindtags $path [lreplace $tags $idx $idx ${tagprefix}$event]
      } else {
        bindtags $path [linsert $tags 1 ${tagprefix}$event]
      }
      _drag_source_update_types $path $types
    }
    unregister {
      if { $idx != -1 } {
        bindtags $path [lreplace $tags $idx $idx]
      }
    }
  }
};# tkdnd::drag_source

proc ::tkdnd::_drag_source_update_types { path types } {
  set types [platform_specific_types $types]
  set old_types [bind $path <<DragSourceTypes>>]
  foreach type $types {
    if {[lsearch $old_types $type] < 0} {lappend old_types $type}
  }
  bind $path <<DragSourceTypes>> $old_types
};# ::tkdnd::_drag_source_update_types

# ----------------------------------------------------------------------------
#  Command tkdnd::drop_target
# ----------------------------------------------------------------------------
proc ::tkdnd::drop_target { mode path { types {} } } {
  variable _windowingsystem
  set types [platform_specific_types $types]
  switch -- $mode {
    register {
      switch $_windowingsystem {
        x11 {
          _register_types $path [winfo toplevel $path] $types
        }
        win32 -
        windows {
          _RegisterDragDrop $path
          bind <Destroy> $path {+ tkdnd::_RevokeDragDrop %W}
        }
        aqua {
          macdnd::registerdragwidget [winfo toplevel $path] $types
        }
        default {
          error "unknown Tk windowing system"
        }
      }
      set old_types [bind $path <<DropTargetTypes>>]
      set new_types {}
      foreach type $types {
        if {[lsearch -exact $old_types $type] < 0} {lappend new_types $type}
      }
      if {[llength $new_types]} {
        bind $path <<DropTargetTypes>> [concat $old_types $new_types]
      }
    }
    unregister {
      switch $_windowingsystem {
        x11 {
        }
        win32 -
        windows {
          _RevokeDragDrop $path
        }
        aqua {
          error todo
        }
        default {
          error "unknown Tk windowing system"
        }
      }
      bind $path <<DropTargetTypes>> {}
    }
  }
};# tkdnd::drop_target

# ----------------------------------------------------------------------------
#  Command tkdnd::_begin_drag
# ----------------------------------------------------------------------------
proc ::tkdnd::_begin_drag { event button source state X Y x y } {
  variable _x0
  variable _y0
  variable _state

  switch -- $event {
    press {
      set _x0    $X
      set _y0    $Y
      set _state "press"
    }
    motion {
      if { ![info exists _state] } {
        # This is just extra protection. There seem to be
        # rare cases where the motion comes before the press.
        return
      }
      if { [string equal $_state "press"] } {
        variable _dx
        variable _dy
        if { abs($_x0-$X) > ${_dx} || abs($_y0-$Y) > ${_dy} } {
          set _state "done"
          _init_drag $button $source $state $X $Y $x $y
        }
      }
    }
  }
};# tkdnd::_begin_drag

# ----------------------------------------------------------------------------
#  Command tkdnd::_init_drag
# ----------------------------------------------------------------------------
proc ::tkdnd::_init_drag { button source state rootX rootY X Y } {
  # Call the <<DragInitCmd>> binding.
  set cmd [bind $source <<DragInitCmd>>]
  # puts "CMD: $cmd"
  if {[string length $cmd]} {
    set cmd [string map [list %W $source %X $rootX %Y $rootY %x $X %y $Y \
                              %S $state  %e <<DragInitCmd>> %A \{\} %% % \
                              %t [bind $source <<DragSourceTypes>>]] $cmd]
    set code [catch {uplevel \#0 $cmd} info options]
    # puts "CODE: $code ---- $info"
    switch -exact -- $code {
      0 {}
      3 - 4 {
        # FRINK: nocheck
        return
      }
      default {
        return -options $options $info
      }
    }

    set len [llength $info]
    if {$len == 3} {
      foreach { actions types _data } $info { break }
      set types [platform_specific_types $types]
      set data [list]
      foreach type $types {
        lappend data $_data
      }
      unset _data
    } elseif {$len == 2} {
      foreach { actions _data } $info { break }
      set data [list]; set types [list]
      foreach {t d} $_data {
        foreach t [platform_specific_types $t] {
          lappend types $t; lappend data $d
        }
      }
      unset _data t d
    } else {
      if {$len == 1 && [string equal [lindex $actions 0] "refuse_drop"]} {
        return
      }
      error "not enough items in the result of the <<DragInitCmd>>\
             event binding. Either 2 or 3 items are expected. The command
             executed was: \"$cmd\"\nResult was: \"$info\""
    }
    set action refuse_drop
    variable _windowingsystem
    # puts "Source:   \"$source\""
    # puts "Types:    \"[join $types {", "}]\""
    # puts "Actions:  \"[join $actions {", "}]\""
    # puts "Button:   \"$button\""
    # puts "Data:     \"[string range $data 0 100]\""
    switch $_windowingsystem {
      x11 {
        set action [xdnd::_dodragdrop $source $actions $types $data $button]
      }
      win32 -
      windows {
        set action [_DoDragDrop $source $actions $types $data $button]
      }
      aqua {
        set action [macdnd::dodragdrop $source $actions $types $data $button]
      }
      default {
        error "unknown Tk windowing system"
      }
    }
    ## Call _end_drag to notify the widget of the result of the drag
    ## operation...
    _end_drag $button $source {} $action {} $data {} $state $rootX $rootY $X $Y
  }
};# tkdnd::_init_drag

# ----------------------------------------------------------------------------
#  Command tkdnd::_end_drag
# ----------------------------------------------------------------------------
proc ::tkdnd::_end_drag { button source target action type data result
                          state rootX rootY X Y } {
  set rootX 0
  set rootY 0
  # Call the <<DragEndCmd>> binding.
  set cmd [bind $source <<DragEndCmd>>]
  if {[string length $cmd]} {
    set cmd [string map [list %W $source %X $rootX %Y $rootY %x $X %y $Y %% % \
                              %S $state %e <<DragEndCmd>> %A \{$action\}] $cmd]
    set info [uplevel \#0 $cmd]
    # if { $info != "" } {
    #   variable _windowingsystem
    #   foreach { actions types data } $info { break }
    #   set types [platform_specific_types $types]
    #   switch $_windowingsystem {
    #     x11 {
    #       error "dragging from Tk widgets not yet supported"
    #     }
    #     win32 -
    #     windows {
    #       set action [_DoDragDrop $source $actions $types $data $button]
    #     }
    #     aqua {
    #       macdnd::dodragdrop $source $actions $types $data
    #     }
    #     default {
    #       error "unknown Tk windowing system"
    #     }
    #   }
    #   ## Call _end_drag to notify the widget of the result of the drag
    #   ## operation...
    #   _end_drag $button $source {} $action {} $data {} $state $rootX $rootY
    # }
  }
};# tkdnd::_end_drag

# ----------------------------------------------------------------------------
#  Command tkdnd::platform_specific_types
# ----------------------------------------------------------------------------
proc ::tkdnd::platform_specific_types { types } {
  variable _platform_namespace
  ${_platform_namespace}::platform_specific_types $types
}; # tkdnd::platform_specific_types

# ----------------------------------------------------------------------------
#  Command tkdnd::platform_independent_types
# ----------------------------------------------------------------------------
proc ::tkdnd::platform_independent_types { types } {
  variable _platform_namespace
  ${_platform_namespace}::platform_independent_types $types
}; # tkdnd::platform_independent_types

# ----------------------------------------------------------------------------
#  Command tkdnd::platform_specific_type
# ----------------------------------------------------------------------------
proc ::tkdnd::platform_specific_type { type } {
  variable _platform_namespace
  ${_platform_namespace}::platform_specific_type $type
}; # tkdnd::platform_specific_type

# ----------------------------------------------------------------------------
#  Command tkdnd::platform_independent_type
# ----------------------------------------------------------------------------
proc ::tkdnd::platform_independent_type { type } {
  variable _platform_namespace
  ${_platform_namespace}::platform_independent_type $type
}; # tkdnd::platform_independent_type

# ----------------------------------------------------------------------------
#  Command tkdnd::bytes_to_string
# ----------------------------------------------------------------------------
proc ::tkdnd::bytes_to_string { bytes } {
  set string {}
  foreach byte $bytes {
    append string [binary format c $byte]
  }
  return $string
};# tkdnd::bytes_to_string

# ----------------------------------------------------------------------------
#  Command tkdnd::urn_unquote
# ----------------------------------------------------------------------------
proc ::tkdnd::urn_unquote {url} {
  set result ""
  set start 0
  while {[regexp -start $start -indices {%[0-9a-fA-F]{2}} $url match]} {
    foreach {first last} $match break
    append result [string range $url $start [expr {$first - 1}]]
    append result [format %c 0x[string range $url [incr first] $last]]
    set start [incr last]
  }
  append result [string range $url $start end]
  return [encoding convertfrom utf-8 $result]
};# tkdnd::urn_unquote