annotate man/lispref/dragndrop.texi @ 4905:755ae5b97edb

Change "special form" to "special operator" in our sources. Add a compatible function alias, and the relevant manual index entries. src/ChangeLog addition: 2010-01-31 Aidan Kehoe <kehoea@parhasard.net> * symbols.c (Fspecial_operator_p, syms_of_symbols): * eval.c (print_subr, Finteractive_p, Ffuncall) (Ffunction_min_args, Ffunction_max_args, vars_of_eval): * editfns.c: * data.c (Fsubr_max_args): * doc.c (Fbuilt_in_symbol_file): Change "special form" to "special operator" in our sources. man/ChangeLog addition: 2010-01-31 Aidan Kehoe <kehoea@parhasard.net> * xemacs/programs.texi (Defuns): * lispref/variables.texi (Local Variables, Defining Variables) (Setting Variables, Default Value): * lispref/symbols.texi (Definitions): * lispref/searching.texi (Saving Match Data): * lispref/positions.texi (Excursions, Narrowing): * lispref/objects.texi (Primitive Function Type): * lispref/macros.texi (Defining Macros, Backquote): * lispref/lispref.texi (Top): * lispref/intro.texi (A Sample Function Description): * lispref/help.texi (Help Functions): * lispref/functions.texi (What Is a Function, Simple Lambda) (Defining Functions, Calling Functions, Anonymous Functions): * lispref/frames.texi (Input Focus): * lispref/eval.texi (Forms, Function Indirection) (Special Operators, Quoting): * lispref/edebug-inc.texi (Instrumenting) (Specification Examples): * lispref/debugging.texi (Internals of Debugger): * lispref/control.texi (Control Structures, Sequencing): (Conditionals, Combining Conditions, Iteration): (Catch and Throw, Handling Errors): * lispref/commands.texi (Defining Commands, Using Interactive): Terminology change; special operator -> special form. Don't attempt to change this in texinfo.texi or cl.texi, which use macros I don't understand. * lispref/macros.texi (Defining Macros): Give an anonymous macro example here. * lispref/positions.texi (Excursions): Correct some documentation that called a couple of macros special forms. * lispref/searching.texi (Saving Match Data): Drop some documentation of how to write code that works with Emacs 18. * lispref/specifiers.texi (Adding Specifications): Correct this; #'let-specifier is a macro, not a special operator. * lispref/windows.texi (Window Configurations) (Selecting Windows): Correct this, #'save-selected-window and #'save-window-excursion are macros, not special operators. lisp/ChangeLog addition: 2010-01-31 Aidan Kehoe <kehoea@parhasard.net> * obsolete.el: * loadhist.el (symbol-file): * help.el (describe-function-1): * bytecomp.el: (byte-compile-save-current-buffer): * byte-optimize.el (byte-optimize-form-code-walker): * subr.el (subr-arity): Change "special form" to "special operator" in these files, it's the more logical term. * subr.el (special-form-p): Provide this alias for #'special-operator-p.
author Aidan Kehoe <kehoea@parhasard.net>
date Sun, 31 Jan 2010 20:28:01 +0000
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1 @c -*-texinfo-*-
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2 @c This is part of the XEmacs Lisp Reference Manual.
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3 @c Copyright (C) 1998 Oliver Graf <ograf@fga.de>
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4 @c Original reference is (c) 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
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5 @c See the file lispref.texi for copying conditions.
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6 @setfilename ../../info/dragndrop.texi
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7 @node Drag and Drop, Modes, Scrollbars, Top
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8 @chapter Drag and Drop
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9 @cindex drag and drop
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10
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11 @emph{WARNING}: the Drag'n'Drop API is still under development and the
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12 interface may change! The current implementation is considered experimental.
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13
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14 Drag'n'drop is a way to transfer information between multiple applications.
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15 To do this several GUIs define their own protocols. Examples are CDE, Motif,
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16 KDE, MSWindows, GNOME, and many more. To catch all these protocols, XEmacs
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17 provides a generic API.
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19 One prime idea behind the API is to use a data interface that is
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20 transparent for all systems. The author thinks that this is best
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21 archived by using URL and MIME data, cause any internet enabled system
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22 must support these for email already. XEmacs also already provides
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23 powerful interfaces to support these types of data (tm and w3).
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24
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25 @menu
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26 * Supported Protocols:: Which low-level protocols are supported.
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27 * Drop Interface:: How XEmacs handles a drop from another application.
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28 * Drag Interface:: Calls to initiate a drag from XEmacs.
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29 @end menu
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31 @node Supported Protocols
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32 @section Supported Protocols
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33
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34 The current release of XEmacs only support a small set of Drag'n'drop
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35 protocols. Some of these only support limited options available in the API.
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36
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37 @menu
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38 * CDE dt:: Common Desktop Environment used on suns.
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39 * MSWindows OLE:: Mr. Gates way of live.
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40 * Loose ends:: The other protocols.
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41 @end menu
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43 @node CDE dt
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44 @subsection CDE dt
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45 @cindex CDE dt
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46
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47 CDE stands for Common Desktop Environment. It is based on the Motif
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48 widget library. It's drag'n'drop protocol is also an abstraction of the
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49 Motif protocol (so it might be possible, that XEmacs will also support
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50 the Motif protocol soon).
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51
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52 CDE has three different types: file, buffer, and text. XEmacs only uses
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53 file and buffer drags. The API will disallow full URL drags, only file
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54 method URLs are passed through.
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55
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56 Buffer drags are always converted to plain text.
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57
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58 @node MSWindows OLE
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59 @subsection MSWindows OLE
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60 @cindex MSWindows OLE
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61
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62 Only allows file drags and drops.
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63
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64 @node Loose ends
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65 @subsection Loose ends
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66
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67 The following protocols will be supported soon: Xdnd, Motif, Xde (if I
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68 get some specs).
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70 In particular Xdnd will be one of the protocols that can benefit from
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71 the XEmacs API, cause it also uses MIME types to encode dragged data.
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73 @node Drop Interface
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74 @section Drop Interface
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75 @cindex drop
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76 @cindex Drop API
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77
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78 For each activated low-level protocol, an internal routine will catch
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79 incoming drops and convert them to a dragdrop-drop type
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80 misc-user-event.
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81
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82 This misc-user-event has its function argument set to
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83 @code{dragdrop-drop-dispatch} and the object contains the data of the drop
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84 (converted to URL/MIME specific data). This function will search the variable
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85 @code{experimental-dragdrop-drop-functions} for a function that can handle the
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86 dropped data.
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87
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88 To modify the drop behavior, the user can modify the variable
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89 @code{experimental-dragdrop-drop-functions}. Each element of this list
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90 specifies a possible handler for dropped data. The first one that can handle
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91 the data will return @code{t} and exit. Another possibility is to set a
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92 extent-property with the same name. Extents are checked prior to the
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93 variable.
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94
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95 The customization group @code{drag-n-drop} shows all variables of user
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96 interest.
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98 @node Drag Interface
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99 @section Drag Interface
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100 @cindex drag
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101 @cindex Drag API
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102
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103 This describes the drag API (not implemented yet).