appJar/lib/tkdnd2.8/tcl_files/tkdnd_unix.tcl
#
# tkdnd_unix.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.
#
namespace eval xdnd {
variable _dragging 0
proc initialise { } {
## Mapping from platform types to TkDND types...
::tkdnd::generic::initialise_platform_to_tkdnd_types [list \
text/plain\;charset=utf-8 DND_Text \
UTF8_STRING DND_Text \
text/plain DND_Text \
STRING DND_Text \
TEXT DND_Text \
COMPOUND_TEXT DND_Text \
text/uri-list DND_Files \
text/html\;charset=utf-8 DND_HTML \
text/html DND_HTML \
application/x-color DND_Color \
]
};# initialise
};# namespace xdnd
# ----------------------------------------------------------------------------
# Command xdnd::HandleXdndEnter
# ----------------------------------------------------------------------------
proc xdnd::HandleXdndEnter { path drag_source typelist } {
variable _pressedkeys
variable _actionlist
set _pressedkeys 1
set _actionlist { copy move link ask private }
::tkdnd::generic::HandleEnter $path $drag_source $typelist $typelist \
$_actionlist $_pressedkeys
};# xdnd::HandleXdndEnter
# ----------------------------------------------------------------------------
# Command xdnd::HandleXdndPosition
# ----------------------------------------------------------------------------
proc xdnd::HandleXdndPosition { drop_target rootX rootY {drag_source {}} } {
variable _pressedkeys
variable _last_mouse_root_x; set _last_mouse_root_x $rootX
variable _last_mouse_root_y; set _last_mouse_root_y $rootY
::tkdnd::generic::HandlePosition $drop_target $drag_source \
$_pressedkeys $rootX $rootY
};# xdnd::HandleXdndPosition
# ----------------------------------------------------------------------------
# Command xdnd::HandleXdndLeave
# ----------------------------------------------------------------------------
proc xdnd::HandleXdndLeave { } {
::tkdnd::generic::HandleLeave
};# xdnd::HandleXdndLeave
# ----------------------------------------------------------------------------
# Command xdnd::_HandleXdndDrop
# ----------------------------------------------------------------------------
proc xdnd::HandleXdndDrop { time } {
variable _pressedkeys
variable _last_mouse_root_x
variable _last_mouse_root_y
## Get the dropped data...
::tkdnd::generic::SetDroppedData [GetDroppedData $time]
::tkdnd::generic::HandleDrop {} {} $_pressedkeys \
$_last_mouse_root_x $_last_mouse_root_y $time
};# xdnd::HandleXdndDrop
# ----------------------------------------------------------------------------
# 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]
if {![llength $_common_drag_source_types]} {
error "no common data types between the drag source and drop target widgets"
}
## Is drag source in this application?
if {[catch {winfo pathname -displayof $_drop_target $_drag_source} p]} {
set _use_tk_selection 0
} else {
set _use_tk_selection 1
}
foreach type $_common_drag_source_types {
# puts "TYPE: $type ($_drop_target)"
# _get_selection $_drop_target $time $type
if {$_use_tk_selection} {
if {![catch {
selection get -displayof $_drop_target -selection XdndSelection \
-type $type
} result options]} {
return [normalise_data $type $result]
}
} else {
# puts "_selection_get -displayof $_drop_target -selection XdndSelection \
# -type $type -time $time"
#after 100 [list focus -force $_drop_target]
#after 50 [list raise [winfo toplevel $_drop_target]]
if {![catch {
_selection_get -displayof $_drop_target -selection XdndSelection \
-type $type -time $time
} result options]} {
return [normalise_data $type $result]
}
}
}
return -options $options $result
};# xdnd::GetDroppedData
# ----------------------------------------------------------------------------
# Command xdnd::platform_specific_types
# ----------------------------------------------------------------------------
proc xdnd::platform_specific_types { types } {
::tkdnd::generic::platform_specific_types $types
}; # xdnd::platform_specific_types
# ----------------------------------------------------------------------------
# Command xdnd::platform_specific_type
# ----------------------------------------------------------------------------
proc xdnd::platform_specific_type { type } {
::tkdnd::generic::platform_specific_type $type
}; # xdnd::platform_specific_type
# ----------------------------------------------------------------------------
# Command tkdnd::platform_independent_types
# ----------------------------------------------------------------------------
proc ::tkdnd::platform_independent_types { types } {
::tkdnd::generic::platform_independent_types $types
}; # tkdnd::platform_independent_types
# ----------------------------------------------------------------------------
# Command xdnd::platform_independent_type
# ----------------------------------------------------------------------------
proc xdnd::platform_independent_type { type } {
::tkdnd::generic::platform_independent_type $type
}; # xdnd::platform_independent_type
# ----------------------------------------------------------------------------
# Command xdnd::_normalise_data
# ----------------------------------------------------------------------------
proc xdnd::normalise_data { type data } {
# Tk knows how to interpret the following types:
# STRING, TEXT, COMPOUND_TEXT
# UTF8_STRING
# Else, it returns a list of 8 or 32 bit numbers...
switch -glob $type {
STRING - UTF8_STRING - TEXT - COMPOUND_TEXT {return $data}
text/html {
if {[catch {
encoding convertfrom unicode $data
} string]} {
set string $data
}
return [string map {\r\n \n} $string]
}
text/html\;charset=utf-8 -
text/plain\;charset=utf-8 -
text/plain {
if {[catch {
encoding convertfrom utf-8 [tkdnd::bytes_to_string $data]
} string]} {
set string $data
}
return [string map {\r\n \n} $string]
}
text/uri-list* {
if {[catch {
encoding convertfrom utf-8 [tkdnd::bytes_to_string $data
} string]} {
set string $data
}
## Get rid of \r\n
set string [string trim [string map {\r\n \n} $string]]
set files {}
foreach quoted_file [split $string] {
set file [tkdnd::urn_unquote $quoted_file]
switch -glob $file {
file://* {lappend files [string range $file 7 end]}
ftp://* -
https://* -
http://* {lappend files $quoted_file}
default {lappend files $file}
}
}
return $files
}
application/x-color {
return $data
}
text/x-moz-url -
application/q-iconlist -
default {return $data}
}
}; # xdnd::normalise_data
#############################################################################
##
## XDND drag implementation
##
#############################################################################
# ----------------------------------------------------------------------------
# Command xdnd::_selection_ownership_lost
# ----------------------------------------------------------------------------
proc xdnd::_selection_ownership_lost {} {
variable _dragging
set _dragging 0
};# _selection_ownership_lost
# ----------------------------------------------------------------------------
# Command xdnd::_dodragdrop
# ----------------------------------------------------------------------------
proc xdnd::_dodragdrop { source actions types data button } {
variable _dragging
# puts "xdnd::_dodragdrop: source: $source, actions: $actions, types: $types,\
# data: \"$data\", button: $button"
if {$_dragging} {
## We are in the middle of another drag operation...
error "another drag operation in progress"
}
variable _dodragdrop_drag_source $source
variable _dodragdrop_drop_target 0
variable _dodragdrop_drop_target_proxy 0
variable _dodragdrop_actions $actions
variable _dodragdrop_action_descriptions $actions
variable _dodragdrop_actions_len [llength $actions]
variable _dodragdrop_types $types
variable _dodragdrop_types_len [llength $types]
variable _dodragdrop_data $data
variable _dodragdrop_transfer_data {}
variable _dodragdrop_button $button
variable _dodragdrop_time 0
variable _dodragdrop_default_action refuse_drop
variable _dodragdrop_waiting_status 0
variable _dodragdrop_drop_target_accepts_drop 0
variable _dodragdrop_drop_target_accepts_action refuse_drop
variable _dodragdrop_current_cursor $_dodragdrop_default_action
variable _dodragdrop_drop_occured 0
variable _dodragdrop_selection_requestor 0
##
## If we have more than 3 types, the property XdndTypeList must be set on
## the drag source widget...
##
if {$_dodragdrop_types_len > 3} {
_announce_type_list $_dodragdrop_drag_source $_dodragdrop_types
}
##
## Announce the actions & their descriptions on the XdndActionList &
## XdndActionDescription properties...
##
_announce_action_list $_dodragdrop_drag_source $_dodragdrop_actions \
$_dodragdrop_action_descriptions
##
## Arrange selection handlers for our drag source, and all the supported types
##
registerSelectionHandler $source $types
##
## Step 1: When a drag begins, the source takes ownership of XdndSelection.
##
selection own -command ::tkdnd::xdnd::_selection_ownership_lost \
-selection XdndSelection $source
set _dragging 1
## Grab the mouse pointer...
_grab_pointer $source $_dodragdrop_default_action
## Register our generic event handler...
# The generic event callback will report events by modifying variable
# ::xdnd::_dodragdrop_event: a dict with event information will be set as
# the value of the variable...
_register_generic_event_handler
## Set a timeout for debugging purposes...
# after 60000 {set ::tkdnd::xdnd::_dragging 0}
tkwait variable ::tkdnd::xdnd::_dragging
_SendXdndLeave
set _dragging 0
_ungrab_pointer $source
_unregister_generic_event_handler
catch {selection clear -selection XdndSelection}
unregisterSelectionHandler $source $types
return $_dodragdrop_drop_target_accepts_action
};# xdnd::_dodragdrop
# ----------------------------------------------------------------------------
# Command xdnd::_process_drag_events
# ----------------------------------------------------------------------------
proc xdnd::_process_drag_events {event} {
# The return value from proc is normally 0. A non-zero return value indicates
# that the event is not to be handled further; that is, proc has done all
# processing that is to be allowed for the event
variable _dragging
if {!$_dragging} {return 0}
# puts $event
variable _dodragdrop_time
set time [dict get $event time]
set type [dict get $event type]
if {$time < $_dodragdrop_time && ![string equal $type SelectionRequest]} {
return 0
}
set _dodragdrop_time $time
variable _dodragdrop_drag_source
variable _dodragdrop_drop_target
variable _dodragdrop_drop_target_proxy
variable _dodragdrop_default_action
switch $type {
MotionNotify {
set rootx [dict get $event x_root]
set rooty [dict get $event y_root]
set window [_find_drop_target_window $_dodragdrop_drag_source \
$rootx $rooty]
if {[string length $window]} {
## Examine the modifiers to suggest an action...
set _dodragdrop_default_action [_default_action $event]
## Is it a Tk widget?
# set path [winfo containing $rootx $rooty]
# puts "Window under mouse: $window ($path)"
if {$_dodragdrop_drop_target != $window} {
## Send XdndLeave to $_dodragdrop_drop_target
_SendXdndLeave
## Is there a proxy? If not, _find_drop_target_proxy returns the
## target window, so we always get a valid "proxy".
set proxy [_find_drop_target_proxy $_dodragdrop_drag_source $window]
## Send XdndEnter to $window
_SendXdndEnter $window $proxy
## Send XdndPosition to $_dodragdrop_drop_target
_SendXdndPosition $rootx $rooty $_dodragdrop_default_action
} else {
## Send XdndPosition to $_dodragdrop_drop_target
_SendXdndPosition $rootx $rooty $_dodragdrop_default_action
}
} else {
## No window under the mouse. Send XdndLeave to $_dodragdrop_drop_target
_SendXdndLeave
}
}
ButtonPress {
}
ButtonRelease {
variable _dodragdrop_button
set button [dict get $event button]
if {$button == $_dodragdrop_button} {
## The button that initiated the drag was released. Trigger drop...
_SendXdndDrop
}
return 1
}
KeyPress {
}
KeyRelease {
set keysym [dict get $event keysym]
switch $keysym {
Escape {
## The user has pressed escape. Abort...
if {$_dragging} {set _dragging 0}
}
}
}
SelectionRequest {
variable _dodragdrop_selection_requestor
variable _dodragdrop_selection_property
variable _dodragdrop_selection_selection
variable _dodragdrop_selection_target
variable _dodragdrop_selection_time
set _dodragdrop_selection_requestor [dict get $event requestor]
set _dodragdrop_selection_property [dict get $event property]
set _dodragdrop_selection_selection [dict get $event selection]
set _dodragdrop_selection_target [dict get $event target]
set _dodragdrop_selection_time $time
return 0
}
default {
return 0
}
}
return 0
};# _process_drag_events
# ----------------------------------------------------------------------------
# Command xdnd::_SendXdndEnter
# ----------------------------------------------------------------------------
proc xdnd::_SendXdndEnter {window proxy} {
variable _dodragdrop_drag_source
variable _dodragdrop_drop_target
variable _dodragdrop_drop_target_proxy
variable _dodragdrop_types
variable _dodragdrop_waiting_status
variable _dodragdrop_drop_occured
if {$_dodragdrop_drop_target > 0} _SendXdndLeave
if {$_dodragdrop_drop_occured} return
set _dodragdrop_drop_target $window
set _dodragdrop_drop_target_proxy $proxy
set _dodragdrop_waiting_status 0
if {$_dodragdrop_drop_target < 1} return
# puts "XdndEnter: $_dodragdrop_drop_target $_dodragdrop_drop_target_proxy"
_send_XdndEnter $_dodragdrop_drag_source $_dodragdrop_drop_target \
$_dodragdrop_drop_target_proxy $_dodragdrop_types
};# xdnd::_SendXdndEnter
# ----------------------------------------------------------------------------
# Command xdnd::_SendXdndPosition
# ----------------------------------------------------------------------------
proc xdnd::_SendXdndPosition {rootx rooty action} {
variable _dodragdrop_drag_source
variable _dodragdrop_drop_target
if {$_dodragdrop_drop_target < 1} return
variable _dodragdrop_drop_occured
if {$_dodragdrop_drop_occured} return
variable _dodragdrop_drop_target_proxy
variable _dodragdrop_waiting_status
## Arrange a new XdndPosition, to be send periodically...
variable _dodragdrop_xdnd_position_heartbeat
catch {after cancel $_dodragdrop_xdnd_position_heartbeat}
set _dodragdrop_xdnd_position_heartbeat [after 200 \
[list ::tkdnd::xdnd::_SendXdndPosition $rootx $rooty $action]]
if {$_dodragdrop_waiting_status} {return}
# puts "XdndPosition: $_dodragdrop_drop_target $rootx $rooty $action"
_send_XdndPosition $_dodragdrop_drag_source $_dodragdrop_drop_target \
$_dodragdrop_drop_target_proxy $rootx $rooty $action
set _dodragdrop_waiting_status 1
};# xdnd::_SendXdndPosition
# ----------------------------------------------------------------------------
# Command xdnd::_HandleXdndStatus
# ----------------------------------------------------------------------------
proc xdnd::_HandleXdndStatus {event} {
variable _dodragdrop_drop_target
variable _dodragdrop_waiting_status
variable _dodragdrop_drop_target_accepts_drop
variable _dodragdrop_drop_target_accepts_action
set _dodragdrop_waiting_status 0
foreach key {target accept want_position action x y w h} {
set $key [dict get $event $key]
}
set _dodragdrop_drop_target_accepts_drop $accept
set _dodragdrop_drop_target_accepts_action $action
if {$_dodragdrop_drop_target < 1} return
variable _dodragdrop_drop_occured
if {$_dodragdrop_drop_occured} return
_update_cursor
# puts "XdndStatus: $event"
};# xdnd::_HandleXdndStatus
# ----------------------------------------------------------------------------
# Command xdnd::_HandleXdndFinished
# ----------------------------------------------------------------------------
proc xdnd::_HandleXdndFinished {event} {
variable _dodragdrop_xdnd_finished_event_after_id
catch {after cancel $_dodragdrop_xdnd_finished_event_after_id}
set _dodragdrop_xdnd_finished_event_after_id {}
variable _dodragdrop_drop_target
set _dodragdrop_drop_target 0
variable _dragging
if {$_dragging} {set _dragging 0}
variable _dodragdrop_drop_target_accepts_drop
variable _dodragdrop_drop_target_accepts_action
if {[dict size $event]} {
foreach key {target accept action} {
set $key [dict get $event $key]
}
set _dodragdrop_drop_target_accepts_drop $accept
set _dodragdrop_drop_target_accepts_action $action
} else {
set _dodragdrop_drop_target_accepts_drop 0
}
if {!$_dodragdrop_drop_target_accepts_drop} {
set _dodragdrop_drop_target_accepts_action refuse_drop
}
# puts "XdndFinished: $event"
};# xdnd::_HandleXdndFinished
# ----------------------------------------------------------------------------
# Command xdnd::_SendXdndLeave
# ----------------------------------------------------------------------------
proc xdnd::_SendXdndLeave {} {
variable _dodragdrop_drag_source
variable _dodragdrop_drop_target
if {$_dodragdrop_drop_target < 1} return
variable _dodragdrop_drop_target_proxy
# puts "XdndLeave: $_dodragdrop_drop_target"
_send_XdndLeave $_dodragdrop_drag_source $_dodragdrop_drop_target \
$_dodragdrop_drop_target_proxy
set _dodragdrop_drop_target 0
variable _dodragdrop_drop_target_accepts_drop
variable _dodragdrop_drop_target_accepts_action
set _dodragdrop_drop_target_accepts_drop 0
set _dodragdrop_drop_target_accepts_action refuse_drop
variable _dodragdrop_drop_occured
if {$_dodragdrop_drop_occured} return
_update_cursor
};# xdnd::_SendXdndLeave
# ----------------------------------------------------------------------------
# Command xdnd::_SendXdndDrop
# ----------------------------------------------------------------------------
proc xdnd::_SendXdndDrop {} {
variable _dodragdrop_drag_source
variable _dodragdrop_drop_target
if {$_dodragdrop_drop_target < 1} {
## The mouse has been released over a widget that does not accept drops.
_HandleXdndFinished {}
return
}
variable _dodragdrop_drop_occured
if {$_dodragdrop_drop_occured} {return}
variable _dodragdrop_drop_target_proxy
variable _dodragdrop_drop_target_accepts_drop
variable _dodragdrop_drop_target_accepts_action
set _dodragdrop_drop_occured 1
_update_cursor clock
if {!$_dodragdrop_drop_target_accepts_drop} {
_SendXdndLeave
_HandleXdndFinished {}
return
}
# puts "XdndDrop: $_dodragdrop_drop_target"
variable _dodragdrop_drop_timestamp
set _dodragdrop_drop_timestamp [_send_XdndDrop \
$_dodragdrop_drag_source $_dodragdrop_drop_target \
$_dodragdrop_drop_target_proxy]
set _dodragdrop_drop_target 0
# puts "XdndDrop: $_dodragdrop_drop_target"
## Arrange a timeout for receiving XdndFinished...
variable _dodragdrop_xdnd_finished_event_after_id
set _dodragdrop_xdnd_finished_event_after_id \
[after 10000 [list ::tkdnd::xdnd::_HandleXdndFinished {}]]
};# xdnd::_SendXdndDrop
# ----------------------------------------------------------------------------
# Command xdnd::_update_cursor
# ----------------------------------------------------------------------------
proc xdnd::_update_cursor { {cursor {}}} {
# puts "_update_cursor $cursor"
variable _dodragdrop_current_cursor
variable _dodragdrop_drag_source
variable _dodragdrop_drop_target_accepts_drop
variable _dodragdrop_drop_target_accepts_action
if {![string length $cursor]} {
set cursor refuse_drop
if {$_dodragdrop_drop_target_accepts_drop} {
set cursor $_dodragdrop_drop_target_accepts_action
}
}
if {![string equal $cursor $_dodragdrop_current_cursor]} {
_set_pointer_cursor $_dodragdrop_drag_source $cursor
set _dodragdrop_current_cursor $cursor
}
};# xdnd::_update_cursor
# ----------------------------------------------------------------------------
# Command xdnd::_default_action
# ----------------------------------------------------------------------------
proc xdnd::_default_action {event} {
variable _dodragdrop_actions
variable _dodragdrop_actions_len
if {$_dodragdrop_actions_len == 1} {return [lindex $_dodragdrop_actions 0]}
set alt [dict get $event Alt]
set shift [dict get $event Shift]
set control [dict get $event Control]
if {$shift && $control && [lsearch $_dodragdrop_actions link] != -1} {
return link
} elseif {$control && [lsearch $_dodragdrop_actions copy] != -1} {
return copy
} elseif {$shift && [lsearch $_dodragdrop_actions move] != -1} {
return move
} elseif {$alt && [lsearch $_dodragdrop_actions link] != -1} {
return link
}
return default
};# xdnd::_default_action
# ----------------------------------------------------------------------------
# Command xdnd::getFormatForType
# ----------------------------------------------------------------------------
proc xdnd::getFormatForType {type} {
switch -glob [string tolower $type] {
text/plain\;charset=utf-8 -
text/html\;charset=utf-8 -
utf8_string {set format UTF8_STRING}
text/html -
text/plain -
string -
text -
compound_text {set format STRING}
text/uri-list* {set format UTF8_STRING}
application/x-color {set format $type}
default {set format $type}
}
return $format
};# xdnd::getFormatForType
# ----------------------------------------------------------------------------
# Command xdnd::registerSelectionHandler
# ----------------------------------------------------------------------------
proc xdnd::registerSelectionHandler {source types} {
foreach type $types {
selection handle -selection XdndSelection \
-type $type \
-format [getFormatForType $type] \
$source [list ::tkdnd::xdnd::_SendData $type]
}
};# xdnd::registerSelectionHandler
# ----------------------------------------------------------------------------
# Command xdnd::unregisterSelectionHandler
# ----------------------------------------------------------------------------
proc xdnd::unregisterSelectionHandler {source types} {
foreach type $types {
catch {
selection handle -selection XdndSelection \
-type $type \
-format [getFormatForType $type] \
$source {}
}
}
};# xdnd::unregisterSelectionHandler
# ----------------------------------------------------------------------------
# Command xdnd::_convert_to_unsigned
# ----------------------------------------------------------------------------
proc xdnd::_convert_to_unsigned {data format} {
switch $format {
8 { set mask 0xff }
16 { set mask 0xffff }
32 { set mask 0xffffff }
default {error "unsupported format $format"}
}
## Convert signed integer into unsigned...
set d [list]
foreach num $data {
lappend d [expr { $num & $mask }]
}
return $d
};# xdnd::_convert_to_unsigned
# ----------------------------------------------------------------------------
# Command xdnd::_SendData
# ----------------------------------------------------------------------------
proc xdnd::_SendData {type offset bytes args} {
variable _dodragdrop_drag_source
variable _dodragdrop_types
variable _dodragdrop_data
variable _dodragdrop_transfer_data
## The variable _dodragdrop_data contains a list of data, one for each
## type in the _dodragdrop_types variable. We have to search types, and find
## the corresponding entry in the _dodragdrop_data list.
set index [lsearch $_dodragdrop_types $type]
if {$index < 0} {
error "unable to locate data suitable for type \"$type\""
}
set typed_data [lindex $_dodragdrop_data $index]
set format 8
if {$offset == 0} {
## Prepare the data to be transfered...
switch -glob $type {
text/plain* - UTF8_STRING - STRING - TEXT - COMPOUND_TEXT {
binary scan [encoding convertto utf-8 $typed_data] \
c* _dodragdrop_transfer_data
set _dodragdrop_transfer_data \
[_convert_to_unsigned $_dodragdrop_transfer_data $format]
}
text/uri-list* {
set files [list]
foreach file $typed_data {
switch -glob $file {
*://* {lappend files $file}
default {lappend files file://$file}
}
}
binary scan [encoding convertto utf-8 "[join $files \r\n]\r\n"] \
c* _dodragdrop_transfer_data
set _dodragdrop_transfer_data \
[_convert_to_unsigned $_dodragdrop_transfer_data $format]
}
application/x-color {
set format 16
## Try to understand the provided data: we accept a standard Tk colour,
## or a list of 3 values (red green blue) or a list of 4 values
## (red green blue opacity).
switch [llength $typed_data] {
1 { set color [winfo rgb $_dodragdrop_drag_source $typed_data]
lappend color 65535 }
3 { set color $typed_data; lappend color 65535 }
4 { set color $typed_data }
default {error "unknown color data: \"$typed_data\""}
}
## Convert the 4 elements into 16 bit values...
set _dodragdrop_transfer_data [list]
foreach c $color {
lappend _dodragdrop_transfer_data [format 0x%04X $c]
}
}
default {
set format 32
binary scan $typed_data c* _dodragdrop_transfer_data
}
}
}
##
## Data has been split into bytes. Count the bytes requested, and return them
##
set data [lrange $_dodragdrop_transfer_data $offset [expr {$offset+$bytes-1}]]
switch $format {
8 {
set data [encoding convertfrom utf-8 [binary format c* $data]]
}
16 {
variable _dodragdrop_selection_requestor
if {$_dodragdrop_selection_requestor} {
## Tk selection cannot process this format (only 8 & 32 supported).
## Call our XChangeProperty...
set numItems [llength $data]
variable _dodragdrop_selection_property
variable _dodragdrop_selection_selection
variable _dodragdrop_selection_target
variable _dodragdrop_selection_time
XChangeProperty $_dodragdrop_drag_source \
$_dodragdrop_selection_requestor \
$_dodragdrop_selection_property \
$_dodragdrop_selection_target \
$format \
$_dodragdrop_selection_time \
$data $numItems
return -code break
}
}
32 {
}
default {
error "unsupported format $format"
}
}
# puts "SendData: $type $offset $bytes $args ($typed_data)"
# puts " $data"
return $data
};# xdnd::_SendData