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761 lines
27 KiB
EmacsLisp
761 lines
27 KiB
EmacsLisp
;;; x-dnd.el --- drag and drop support for X.
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;; Copyright (C) 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
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;; Author: Jan Dj,Ad(Brv <jan.h.d@swipnet.se>
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;; Maintainer: FSF
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;; Keywords: window, drag, drop
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 3, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Commentary:
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;; This file provides the drop part only. Currently supported protocols
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;; are XDND, Motif and the old KDE 1.x protocol.
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;;; Code:
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(require 'dnd)
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;;; Customizable variables
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(defcustom x-dnd-test-function 'x-dnd-default-test-function
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"The function drag and drop uses to determine if to accept or reject a drop.
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The function takes three arguments, WINDOW ACTION and TYPES.
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WINDOW is where the mouse is when the function is called. WINDOW may be a
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frame if the mouse isn't over a real window (i.e. menu bar, tool bar or
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scroll bar). ACTION is the suggested action from the drag and drop source,
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one of the symbols move, copy link or ask. TYPES is a list of available types
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for the drop.
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The function shall return nil to reject the drop or a cons with two values,
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the wanted action as car and the wanted type as cdr. The wanted action
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can be copy, move, link, ask or private.
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The default value for this variable is `x-dnd-default-test-function'."
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:version "22.1"
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:type 'symbol
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:group 'x)
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(defcustom x-dnd-types-alist
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'(
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("text/uri-list" . x-dnd-handle-uri-list)
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("text/x-moz-url" . x-dnd-handle-moz-url)
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("_NETSCAPE_URL" . x-dnd-handle-uri-list)
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("FILE_NAME" . x-dnd-handle-file-name)
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("UTF8_STRING" . x-dnd-insert-utf8-text)
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("text/plain;charset=UTF-8" . x-dnd-insert-utf8-text)
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("text/plain;charset=utf-8" . x-dnd-insert-utf8-text)
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("text/unicode" . x-dnd-insert-utf16-text)
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("text/plain" . dnd-insert-text)
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("COMPOUND_TEXT" . x-dnd-insert-ctext)
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("STRING" . dnd-insert-text)
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("TEXT" . dnd-insert-text)
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)
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"Which function to call to handle a drop of that type.
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If the type for the drop is not present, or the function is nil,
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the drop is rejected. The function takes three arguments, WINDOW, ACTION
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and DATA. WINDOW is where the drop occurred, ACTION is the action for
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this drop (copy, move, link, private or ask) as determined by a previous
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call to `x-dnd-test-function'. DATA is the drop data.
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The function shall return the action used (copy, move, link or private) if drop
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is successful, nil if not."
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:version "22.1"
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:type 'alist
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:group 'x)
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(defcustom x-dnd-known-types
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'("text/uri-list"
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"text/x-moz-url"
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"_NETSCAPE_URL"
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"FILE_NAME"
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"UTF8_STRING"
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"text/plain;charset=UTF-8"
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"text/plain;charset=utf-8"
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"text/unicode"
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"text/plain"
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"COMPOUND_TEXT"
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"STRING"
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"TEXT"
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)
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"The types accepted by default for dropped data.
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The types are chosen in the order they appear in the list."
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:version "22.1"
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:type '(repeat string)
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:group 'x
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)
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;; Internal variables
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(defvar x-dnd-current-state nil
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"The current state for a drop.
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This is an alist with one entry for each display. The value for each display
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is a vector that contains the state for drag and drop for that display.
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Elements in the vector are:
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Last buffer drag was in,
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last window drag was in,
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types available for drop,
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the action suggested by the source,
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the type we want for the drop,
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the action we want for the drop,
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any protocol specific data.")
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(defvar x-dnd-empty-state [nil nil nil nil nil nil nil])
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(declare-function x-register-dnd-atom "xselect.c")
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(defun x-dnd-init-frame (&optional frame)
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"Setup drag and drop for FRAME (i.e. create appropriate properties)."
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(when (eq 'x (window-system frame))
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(x-register-dnd-atom "DndProtocol" frame)
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(x-register-dnd-atom "_MOTIF_DRAG_AND_DROP_MESSAGE" frame)
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(x-register-dnd-atom "XdndEnter" frame)
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(x-register-dnd-atom "XdndPosition" frame)
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(x-register-dnd-atom "XdndLeave" frame)
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(x-register-dnd-atom "XdndDrop" frame)
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(x-dnd-init-xdnd-for-frame frame)
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(x-dnd-init-motif-for-frame frame)))
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(defun x-dnd-get-state-cons-for-frame (frame-or-window)
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"Return the entry in x-dnd-current-state for a frame or window."
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(let* ((frame (if (framep frame-or-window) frame-or-window
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(window-frame frame-or-window)))
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(display (frame-parameter frame 'display)))
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(if (not (assoc display x-dnd-current-state))
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(push (cons display (copy-sequence x-dnd-empty-state))
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x-dnd-current-state))
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(assoc display x-dnd-current-state)))
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(defun x-dnd-get-state-for-frame (frame-or-window)
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"Return the state in x-dnd-current-state for a frame or window."
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(cdr (x-dnd-get-state-cons-for-frame frame-or-window)))
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(defun x-dnd-default-test-function (window action types)
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"The default test function for drag and drop.
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WINDOW is where the mouse is when this function is called. It may be a frame
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if the mouse is over the menu bar, scroll bar or tool bar.
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ACTION is the suggested action from the source, and TYPES are the
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types the drop data can have. This function only accepts drops with
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types in `x-dnd-known-types'. It always returns the action private."
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(let ((type (x-dnd-choose-type types)))
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(when type (cons 'private type))))
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(defun x-dnd-current-type (frame-or-window)
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"Return the type we want the DND data to be in for the current drop.
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FRAME-OR-WINDOW is the frame or window that the mouse is over."
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(aref (x-dnd-get-state-for-frame frame-or-window) 4))
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(defun x-dnd-forget-drop (frame-or-window)
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"Remove all state for the last drop.
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FRAME-OR-WINDOW is the frame or window that the mouse is over."
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(setcdr (x-dnd-get-state-cons-for-frame frame-or-window)
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(copy-sequence x-dnd-empty-state)))
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(defun x-dnd-maybe-call-test-function (window action)
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"Call `x-dnd-test-function' if something has changed.
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WINDOW is the window the mouse is over. ACTION is the suggested
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action from the source. If nothing has changed, return the last
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action and type we got from `x-dnd-test-function'."
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(let ((buffer (when (window-live-p window)
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(window-buffer window)))
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(current-state (x-dnd-get-state-for-frame window)))
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(when (or (not (equal buffer (aref current-state 0)))
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(not (equal window (aref current-state 1)))
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(not (equal action (aref current-state 3))))
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(save-excursion
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(when buffer (set-buffer buffer))
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(let* ((action-type (funcall x-dnd-test-function
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window
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action
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(aref current-state 2)))
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(handler (cdr (assoc (cdr action-type) x-dnd-types-alist))))
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;; Ignore action-type if we have no handler.
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(setq current-state
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(x-dnd-save-state window
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action
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(when handler action-type)))))))
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(let ((current-state (x-dnd-get-state-for-frame window)))
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(cons (aref current-state 5)
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(aref current-state 4))))
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(defun x-dnd-save-state (window action action-type &optional types extra-data)
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"Save the state of the current drag and drop.
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WINDOW is the window the mouse is over. ACTION is the action suggested
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by the source. ACTION-TYPE is the result of calling `x-dnd-test-function'.
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If given, TYPES are the types for the drop data that the source supports.
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EXTRA-DATA is data needed for a specific protocol."
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(let ((current-state (x-dnd-get-state-for-frame window)))
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(aset current-state 5 (car action-type))
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(aset current-state 4 (cdr action-type))
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(aset current-state 3 action)
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(when types (aset current-state 2 types))
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(when extra-data (aset current-state 6 extra-data))
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(aset current-state 1 window)
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(aset current-state 0 (and (window-live-p window) (window-buffer window)))
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(setcdr (x-dnd-get-state-cons-for-frame window) current-state)))
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(defun x-dnd-handle-moz-url (window action data)
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"Handle one item of type text/x-moz-url.
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WINDOW is the window where the drop happened. ACTION is ignored.
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DATA is the moz-url, which is formatted as two strings separated by \r\n.
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The first string is the URL, the second string is the title of that URL.
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DATA is encoded in utf-16. Decode the URL and call `x-dnd-handle-uri-list'."
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;; Mozilla and applications based on it (Galeon for example) uses
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;; text/unicode, but it is impossible to tell if it is le or be. Use what
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;; the machine Emacs runs on use. This looses if dropping between machines
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;; with different endian, but it is the best we can do.
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(let* ((coding (if (eq (byteorder) ?B) 'utf-16be 'utf-16le))
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(string (decode-coding-string data coding))
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(strings (split-string string "[\r\n]" t))
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;; Can one drop more than one moz-url ?? Assume not.
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(url (car strings))
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(title (car (cdr strings))))
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(x-dnd-handle-uri-list window action url)))
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(defun x-dnd-insert-utf8-text (window action text)
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"Decode the UTF-8 text and insert it at point.
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TEXT is the text as a string, WINDOW is the window where the drop happened."
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(dnd-insert-text window action (decode-coding-string text 'utf-8)))
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(defun x-dnd-insert-utf16-text (window action text)
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"Decode the UTF-16 text and insert it at point.
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TEXT is the text as a string, WINDOW is the window where the drop happened."
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;; See comment in x-dnd-handle-moz-url about coding.
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(let ((coding (if (eq (byteorder) ?B) 'utf-16be 'utf-16le)))
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(dnd-insert-text window action (decode-coding-string text coding))))
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(defun x-dnd-insert-ctext (window action text)
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"Decode the compound text and insert it at point.
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TEXT is the text as a string, WINDOW is the window where the drop happened."
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(dnd-insert-text window action
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(decode-coding-string text
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'compound-text-with-extensions)))
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(defun x-dnd-handle-uri-list (window action string)
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"Split an uri-list into separate URIs and call `dnd-handle-one-url'.
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WINDOW is the window where the drop happened.
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STRING is the uri-list as a string. The URIs are separated by \r\n."
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(let ((uri-list (split-string string "[\0\r\n]" t))
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retval)
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(dolist (bf uri-list)
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;; If one URL is handeled, treat as if the whole drop succeeded.
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(let ((did-action (dnd-handle-one-url window action bf)))
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(when did-action (setq retval did-action))))
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retval))
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(defun x-dnd-handle-file-name (window action string)
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"Convert file names to URLs and call `dnd-handle-one-url'.
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WINDOW is the window where the drop happened.
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STRING is the file names as a string, separated by nulls."
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(let ((uri-list (split-string string "[\0\r\n]" t))
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(coding (and default-enable-multibyte-characters
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(or file-name-coding-system
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default-file-name-coding-system)))
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retval)
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(dolist (bf uri-list)
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;; If one URL is handeled, treat as if the whole drop succeeded.
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(if coding (setq bf (encode-coding-string bf coding)))
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(let* ((file-uri (concat "file://"
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(mapconcat 'url-hexify-string
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(split-string bf "/") "/")))
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(did-action (dnd-handle-one-url window action file-uri)))
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(when did-action (setq retval did-action))))
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retval))
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(defun x-dnd-choose-type (types &optional known-types)
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"Choose which type we want to receive for the drop.
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TYPES are the types the source of the drop offers, a vector of type names
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as strings or symbols. Select among the types in `x-dnd-known-types' or
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KNOWN-TYPES if given, and return that type name.
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If no suitable type is found, return nil."
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(let* ((known-list (or known-types x-dnd-known-types))
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(first-known-type (car known-list))
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(types-array types)
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(found (when first-known-type
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(catch 'done
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(dotimes (i (length types-array))
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(let* ((type (aref types-array i))
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(typename (if (symbolp type)
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(symbol-name type) type)))
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(when (equal first-known-type typename)
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(throw 'done first-known-type))))
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nil))))
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(if (and (not found) (cdr known-list))
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(x-dnd-choose-type types (cdr known-list))
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found)))
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(defun x-dnd-drop-data (event frame window data type)
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"Drop one data item onto a frame.
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EVENT is the client message for the drop, FRAME is the frame the drop occurred
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on. WINDOW is the window of FRAME where the drop happened. DATA is the data
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received from the source, and type is the type for DATA, see
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`x-dnd-types-alist').
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Returns the action used (move, copy, link, private) if drop was successful,
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nil if not."
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(let* ((type-info (assoc type x-dnd-types-alist))
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(handler (cdr type-info))
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(state (x-dnd-get-state-for-frame frame))
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(action (aref state 5))
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(w (posn-window (event-start event))))
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(when handler
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(if (and (window-live-p w)
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(not (window-minibuffer-p w))
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(not (window-dedicated-p w)))
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;; If dropping in an ordinary window which we could use,
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;; let dnd-open-file-other-window specify what to do.
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(progn
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(when (not mouse-yank-at-point)
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(goto-char (posn-point (event-start event))))
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(funcall handler window action data))
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;; If we can't display the file here,
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;; make a new window for it.
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(let ((dnd-open-file-other-window t))
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(select-frame frame)
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(funcall handler window action data))))))
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(defun x-dnd-handle-drag-n-drop-event (event)
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"Receive drag and drop events (X client messages).
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Currently XDND, Motif and old KDE 1.x protocols are recognized."
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(interactive "e")
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(let* ((client-message (car (cdr (cdr event))))
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(window (posn-window (event-start event)))
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(message-atom (aref client-message 0))
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(frame (aref client-message 1))
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(format (aref client-message 2))
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(data (aref client-message 3)))
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(cond ((equal "DndProtocol" message-atom) ; Old KDE 1.x.
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(x-dnd-handle-old-kde event frame window message-atom format data))
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((equal "_MOTIF_DRAG_AND_DROP_MESSAGE" message-atom) ; Motif
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(x-dnd-handle-motif event frame window message-atom format data))
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((and (> (length message-atom) 4) ; XDND protocol.
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(equal "Xdnd" (substring message-atom 0 4)))
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(x-dnd-handle-xdnd event frame window message-atom format data)))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; Old KDE protocol. Only dropping of files.
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(defun x-dnd-handle-old-kde (event frame window message format data)
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"Open the files in a KDE 1.x drop."
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(let ((values (x-window-property "DndSelection" frame nil 0 t)))
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(x-dnd-handle-uri-list window 'private
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(replace-regexp-in-string "\0$" "" values))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; XDND protocol.
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(defvar x-dnd-xdnd-to-action
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'(("XdndActionPrivate" . private)
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("XdndActionCopy" . copy)
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("XdndActionMove" . move)
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("XdndActionLink" . link)
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("XdndActionAsk" . ask))
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"Mapping from XDND action types to lisp symbols.")
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(defun x-dnd-init-xdnd-for-frame (frame)
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"Set the XdndAware property for FRAME to indicate that we do XDND."
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(x-change-window-property "XdndAware"
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'(5) ;; The version of XDND we support.
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frame "ATOM" 32 t))
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(defun x-dnd-get-drop-width-height (frame w accept)
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"Return the widht/height to be sent in a XDndStatus message.
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FRAME is the frame and W is the window where the drop happened.
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If ACCEPT is nil return 0 (empty rectangle),
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otherwise if W is a window, return its widht/height,
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otherwise return the frame width/height."
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(if accept
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(if (windowp w) ;; w is not a window if dropping on the menu bar,
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;; scroll bar or tool bar.
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(let ((edges (window-inside-pixel-edges w)))
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(cons
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(- (nth 2 edges) (nth 0 edges)) ;; right - left
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(- (nth 3 edges) (nth 1 edges)))) ;; bottom - top
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(cons (frame-pixel-width frame)
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(frame-pixel-height frame)))
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0))
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(defun x-dnd-get-drop-x-y (frame w)
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"Return the x/y coordinates to be sent in a XDndStatus message.
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Coordinates are required to be absolute.
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FRAME is the frame and W is the window where the drop happened.
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If W is a window, return its absolute corrdinates,
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otherwise return the frame coordinates."
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(let* ((frame-left (frame-parameter frame 'left))
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;; If the frame is outside the display, frame-left looks like
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;; '(0 -16). Extract the -16.
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(frame-real-left (if (consp frame-left) (car (cdr frame-left))
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frame-left))
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(frame-top (frame-parameter frame 'top))
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(frame-real-top (if (consp frame-top) (car (cdr frame-top))
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frame-top)))
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(if (windowp w)
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(let ((edges (window-inside-pixel-edges w)))
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(cons
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(+ frame-real-left (nth 0 edges))
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(+ frame-real-top (nth 1 edges))))
|
||
(cons frame-real-left frame-real-top))))
|
||
|
||
(declare-function x-get-atom-name "xselect.c")
|
||
(declare-function x-send-client-message "xselect.c")
|
||
|
||
(defun x-dnd-handle-xdnd (event frame window message format data)
|
||
"Receive one XDND event (client message) and send the appropriate reply.
|
||
EVENT is the client message. FRAME is where the mouse is now.
|
||
WINDOW is the window within FRAME where the mouse is now.
|
||
FORMAT is 32 (not used). MESSAGE is the data part of an XClientMessageEvent."
|
||
(cond ((equal "XdndEnter" message)
|
||
(let* ((flags (aref data 1))
|
||
(version (and (consp flags) (ash (car flags) -8)))
|
||
(more-than-3 (and (consp flags) (cdr flags)))
|
||
(dnd-source (aref data 0)))
|
||
(if version ;; If flags is bad, version will be nil.
|
||
(x-dnd-save-state
|
||
window nil nil
|
||
(if (> more-than-3 0)
|
||
(x-window-property "XdndTypeList"
|
||
frame "AnyPropertyType"
|
||
dnd-source nil t)
|
||
(vector (x-get-atom-name (aref data 2))
|
||
(x-get-atom-name (aref data 3))
|
||
(x-get-atom-name (aref data 4))))))))
|
||
|
||
((equal "XdndPosition" message)
|
||
(let* ((x (car (aref data 2)))
|
||
(y (cdr (aref data 2)))
|
||
(action (x-get-atom-name (aref data 4)))
|
||
(dnd-source (aref data 0))
|
||
(dnd-time (aref data 3))
|
||
(action-type (x-dnd-maybe-call-test-function
|
||
window
|
||
(cdr (assoc action x-dnd-xdnd-to-action))))
|
||
(reply-action (car (rassoc (car action-type)
|
||
x-dnd-xdnd-to-action)))
|
||
(accept ;; 1 = accept, 0 = reject
|
||
(if (and reply-action action-type) 1 0))
|
||
(list-to-send
|
||
(list (string-to-number
|
||
(frame-parameter frame 'outer-window-id))
|
||
accept ;; 1 = Accept, 0 = reject.
|
||
(x-dnd-get-drop-x-y frame window)
|
||
(x-dnd-get-drop-width-height
|
||
frame window (eq accept 1))
|
||
(or reply-action 0)
|
||
)))
|
||
(x-send-client-message
|
||
frame dnd-source frame "XdndStatus" 32 list-to-send)
|
||
))
|
||
|
||
((equal "XdndLeave" message)
|
||
(x-dnd-forget-drop window))
|
||
|
||
((equal "XdndDrop" message)
|
||
(if (windowp window) (select-window window))
|
||
(let* ((dnd-source (aref data 0))
|
||
(value (and (x-dnd-current-type window)
|
||
(x-get-selection-internal
|
||
'XdndSelection
|
||
(intern (x-dnd-current-type window)))))
|
||
success action ret-action)
|
||
|
||
(setq action (if value
|
||
(condition-case info
|
||
(x-dnd-drop-data event frame window value
|
||
(x-dnd-current-type window))
|
||
(error
|
||
(message "Error: %s" info)
|
||
nil))))
|
||
|
||
(setq success (if action 1 0))
|
||
(setq ret-action
|
||
(if (eq success 1)
|
||
(or (car (rassoc action x-dnd-xdnd-to-action))
|
||
"XdndActionPrivate")
|
||
0))
|
||
|
||
(x-send-client-message
|
||
frame dnd-source frame "XdndFinished" 32
|
||
(list (string-to-number (frame-parameter frame 'outer-window-id))
|
||
success ;; 1 = Success, 0 = Error
|
||
(if success "XdndActionPrivate" 0)
|
||
))
|
||
(x-dnd-forget-drop window)))
|
||
|
||
(t (error "Unknown XDND message %s %s" message data))))
|
||
|
||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
;;; Motif protocol.
|
||
|
||
(defun x-dnd-init-motif-for-frame (frame)
|
||
"Set _MOTIF_DRAG_RECEIVER_INFO for FRAME to indicate that we do Motif DND."
|
||
(x-change-window-property "_MOTIF_DRAG_RECEIVER_INFO"
|
||
(list
|
||
(byteorder)
|
||
0 ; The Motif DND version.
|
||
5 ; We want drag dynamic.
|
||
0 0 0 0 0 0 0
|
||
0 0 0 0 0 0) ; Property must be 16 bytes.
|
||
frame "_MOTIF_DRAG_RECEIVER_INFO" 8 t))
|
||
|
||
(defun x-dnd-get-motif-value (data offset size byteorder)
|
||
(cond ((eq size 2)
|
||
(if (eq byteorder ?l)
|
||
(+ (ash (aref data (1+ offset)) 8)
|
||
(aref data offset))
|
||
(+ (ash (aref data offset) 8)
|
||
(aref data (1+ offset)))))
|
||
|
||
((eq size 4)
|
||
(if (eq byteorder ?l)
|
||
(cons (+ (ash (aref data (+ 3 offset)) 8)
|
||
(aref data (+ 2 offset)))
|
||
(+ (ash (aref data (1+ offset)) 8)
|
||
(aref data offset)))
|
||
(cons (+ (ash (aref data offset) 8)
|
||
(aref data (1+ offset)))
|
||
(+ (ash (aref data (+ 2 offset)) 8)
|
||
(aref data (+ 3 offset))))))))
|
||
|
||
(defun x-dnd-motif-value-to-list (value size byteorder)
|
||
(let ((bytes (cond ((eq size 2)
|
||
(list (logand (lsh value -8) ?\xff)
|
||
(logand value ?\xff)))
|
||
|
||
((eq size 4)
|
||
(if (consp value)
|
||
(list (logand (lsh (car value) -8) ?\xff)
|
||
(logand (car value) ?\xff)
|
||
(logand (lsh (cdr value) -8) ?\xff)
|
||
(logand (cdr value) ?\xff))
|
||
(list (logand (lsh value -24) ?\xff)
|
||
(logand (lsh value -16) ?\xff)
|
||
(logand (lsh value -8) ?\xff)
|
||
(logand value ?\xff)))))))
|
||
(if (eq byteorder ?l)
|
||
(reverse bytes)
|
||
bytes)))
|
||
|
||
|
||
(defvar x-dnd-motif-message-types
|
||
'((0 . XmTOP_LEVEL_ENTER)
|
||
(1 . XmTOP_LEVEL_LEAVE)
|
||
(2 . XmDRAG_MOTION)
|
||
(3 . XmDROP_SITE_ENTER)
|
||
(4 . XmDROP_SITE_LEAVE)
|
||
(5 . XmDROP_START)
|
||
(6 . XmDROP_FINISH)
|
||
(7 . XmDRAG_DROP_FINISH)
|
||
(8 . XmOPERATION_CHANGED))
|
||
"Mapping from numbers to Motif DND message types.")
|
||
|
||
(defvar x-dnd-motif-to-action
|
||
'((1 . move)
|
||
(2 . copy)
|
||
(3 . link) ; Both 3 and 4 has been seen as link.
|
||
(4 . link)
|
||
(2 . private)) ; Motif does not have private, so use copy for private.
|
||
"Mapping from number to operation for Motif DND.")
|
||
|
||
(defun x-dnd-handle-motif (event frame window message-atom format data)
|
||
(let* ((message-type (cdr (assoc (aref data 0) x-dnd-motif-message-types)))
|
||
(source-byteorder (aref data 1))
|
||
(my-byteorder (byteorder))
|
||
(source-flags (x-dnd-get-motif-value data 2 2 source-byteorder))
|
||
(source-action (cdr (assoc (logand ?\xF source-flags)
|
||
x-dnd-motif-to-action))))
|
||
|
||
(cond ((eq message-type 'XmTOP_LEVEL_ENTER)
|
||
(let* ((dnd-source (x-dnd-get-motif-value
|
||
data 8 4 source-byteorder))
|
||
(selection-atom (x-dnd-get-motif-value
|
||
data 12 4 source-byteorder))
|
||
(atom-name (x-get-atom-name selection-atom))
|
||
(types (when atom-name
|
||
(x-get-selection-internal (intern atom-name)
|
||
'TARGETS))))
|
||
(x-dnd-forget-drop frame)
|
||
(when types (x-dnd-save-state window nil nil
|
||
types
|
||
dnd-source))))
|
||
|
||
;; Can not forget drop here, LEAVE comes before DROP_START and
|
||
;; we need the state in DROP_START.
|
||
((eq message-type 'XmTOP_LEVEL_LEAVE)
|
||
nil)
|
||
|
||
((eq message-type 'XmDRAG_MOTION)
|
||
(let* ((state (x-dnd-get-state-for-frame frame))
|
||
(timestamp (x-dnd-motif-value-to-list
|
||
(x-dnd-get-motif-value data 4 4
|
||
source-byteorder)
|
||
4 my-byteorder))
|
||
(x (x-dnd-motif-value-to-list
|
||
(x-dnd-get-motif-value data 8 2 source-byteorder)
|
||
2 my-byteorder))
|
||
(y (x-dnd-motif-value-to-list
|
||
(x-dnd-get-motif-value data 10 2 source-byteorder)
|
||
2 my-byteorder))
|
||
(dnd-source (aref state 6))
|
||
(first-move (not (aref state 3)))
|
||
(action-type (x-dnd-maybe-call-test-function
|
||
window
|
||
source-action))
|
||
(reply-action (car (rassoc (car action-type)
|
||
x-dnd-motif-to-action)))
|
||
(reply-flags
|
||
(x-dnd-motif-value-to-list
|
||
(if reply-action
|
||
(+ reply-action
|
||
?\x30 ; 30: valid drop site
|
||
?\x700) ; 700: can do copy, move or link
|
||
?\x30) ; 30: drop site, but noop.
|
||
2 my-byteorder))
|
||
(reply (append
|
||
(list
|
||
(+ ?\x80 ; 0x80 indicates a reply.
|
||
(if first-move
|
||
3 ; First time, reply is SITE_ENTER.
|
||
2)) ; Not first time, reply is DRAG_MOTION.
|
||
my-byteorder)
|
||
reply-flags
|
||
timestamp
|
||
x
|
||
y)))
|
||
(x-send-client-message frame
|
||
dnd-source
|
||
frame
|
||
"_MOTIF_DRAG_AND_DROP_MESSAGE"
|
||
8
|
||
reply)))
|
||
|
||
((eq message-type 'XmOPERATION_CHANGED)
|
||
(let* ((state (x-dnd-get-state-for-frame frame))
|
||
(timestamp (x-dnd-motif-value-to-list
|
||
(x-dnd-get-motif-value data 4 4 source-byteorder)
|
||
4 my-byteorder))
|
||
(dnd-source (aref state 6))
|
||
(action-type (x-dnd-maybe-call-test-function
|
||
window
|
||
source-action))
|
||
(reply-action (car (rassoc (car action-type)
|
||
x-dnd-motif-to-action)))
|
||
(reply-flags
|
||
(x-dnd-motif-value-to-list
|
||
(if reply-action
|
||
(+ reply-action
|
||
?\x30 ; 30: valid drop site
|
||
?\x700) ; 700: can do copy, move or link
|
||
?\x30) ; 30: drop site, but noop
|
||
2 my-byteorder))
|
||
(reply (append
|
||
(list
|
||
(+ ?\x80 ; 0x80 indicates a reply.
|
||
8) ; 8 is OPERATION_CHANGED
|
||
my-byteorder)
|
||
reply-flags
|
||
timestamp)))
|
||
(x-send-client-message frame
|
||
dnd-source
|
||
frame
|
||
"_MOTIF_DRAG_AND_DROP_MESSAGE"
|
||
8
|
||
reply)))
|
||
|
||
((eq message-type 'XmDROP_START)
|
||
(let* ((x (x-dnd-motif-value-to-list
|
||
(x-dnd-get-motif-value data 8 2 source-byteorder)
|
||
2 my-byteorder))
|
||
(y (x-dnd-motif-value-to-list
|
||
(x-dnd-get-motif-value data 10 2 source-byteorder)
|
||
2 my-byteorder))
|
||
(selection-atom (x-dnd-get-motif-value
|
||
data 12 4 source-byteorder))
|
||
(atom-name (x-get-atom-name selection-atom))
|
||
(dnd-source (x-dnd-get-motif-value
|
||
data 16 4 source-byteorder))
|
||
(action-type (x-dnd-maybe-call-test-function
|
||
window
|
||
source-action))
|
||
(reply-action (car (rassoc (car action-type)
|
||
x-dnd-motif-to-action)))
|
||
(reply-flags
|
||
(x-dnd-motif-value-to-list
|
||
(if reply-action
|
||
(+ reply-action
|
||
?\x30 ; 30: valid drop site
|
||
?\x700) ; 700: can do copy, move or link
|
||
(+ ?\x30 ; 30: drop site, but noop.
|
||
?\x200)) ; 200: drop cancel.
|
||
2 my-byteorder))
|
||
(reply (append
|
||
(list
|
||
(+ ?\x80 ; 0x80 indicates a reply.
|
||
5) ; DROP_START.
|
||
my-byteorder)
|
||
reply-flags
|
||
x
|
||
y))
|
||
(timestamp (x-dnd-get-motif-value
|
||
data 4 4 source-byteorder))
|
||
action)
|
||
|
||
(x-send-client-message frame
|
||
dnd-source
|
||
frame
|
||
"_MOTIF_DRAG_AND_DROP_MESSAGE"
|
||
8
|
||
reply)
|
||
(setq action
|
||
(when (and reply-action atom-name)
|
||
(let* ((value (x-get-selection-internal
|
||
(intern atom-name)
|
||
(intern (x-dnd-current-type window)))))
|
||
(when value
|
||
(condition-case info
|
||
(x-dnd-drop-data event frame window value
|
||
(x-dnd-current-type window))
|
||
(error
|
||
(message "Error: %s" info)
|
||
nil))))))
|
||
(x-get-selection-internal
|
||
(intern atom-name)
|
||
(if action 'XmTRANSFER_SUCCESS 'XmTRANSFER_FAILURE)
|
||
timestamp)
|
||
(x-dnd-forget-drop frame)))
|
||
|
||
(t (error "Unknown Motif DND message %s %s" message-atom data)))))
|
||
|
||
|
||
;;;
|
||
|
||
(provide 'x-dnd)
|
||
|
||
;;; arch-tag: b621fb7e-50da-4323-850b-5fc71ae64621
|
||
;;; x-dnd.el ends here
|