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100 lines
3.1 KiB
C
100 lines
3.1 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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dragdrop.h --- Very simplistic drag and drop support.
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Created: Terry Weissman <terry@netscape.com>, 22-Aug-95.
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*/
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#ifndef __xfe_dragdrop_h_
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#define __xfe_dragdrop_h_
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typedef enum {
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FE_DND_NONE, /* Deliberate 'no dragging' value. */
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FE_DND_MAIL_MESSAGE,
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FE_DND_MAIL_FOLDER,
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FE_DND_NEWS_MESSAGE,
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FE_DND_NEWS_FOLDER,
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FE_DND_BOOKMARK,
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FE_DND_URL,
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FE_DND_COLUMN,
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FE_DND_ADDRESSBOOK,
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FE_DND_HISTORY,
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FE_DND_LDAP_ENTRY,
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FE_DND_BOOKS_DIRECTORIES
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} fe_dnd_Type;
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/* Tells a drop site what kind of event is happening to it. _START means that a
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new drag option has appeared. _DRAG means that it is being moved around.
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_DROP means that it has potentially dropped on this site. _END means that
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the drag is all done. */
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typedef enum {
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FE_DND_START,
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FE_DND_DRAG,
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FE_DND_DROP,
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FE_DND_END
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} fe_dnd_Event;
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typedef struct fe_dnd_Source fe_dnd_Source;
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/* messages sent from the drop site back to the source. */
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typedef enum {
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FE_DND_MESSAGE_COPY,
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FE_DND_MESSAGE_MOVE,
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FE_DND_MESSAGE_DELETE
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} fe_dnd_Message;
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typedef void (*fe_dnd_SourceDropFunc)(fe_dnd_Source *source, fe_dnd_Message, void *closure);
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struct fe_dnd_Source {
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Widget widget; /* Toplevel widget to drag around. */
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int hotx; /* Where in the widget the cursor should */
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int hoty; /* "stick". */
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fe_dnd_Type type; /* Type of thing being dragged. */
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void* closure; /* Type-specific data about the thing being
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dragged. */
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fe_dnd_SourceDropFunc func; /* a way for the drop site to tell the source to do some operation. */
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};
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typedef void (*fe_dnd_DropFunc)(Widget dropw, void* closure, fe_dnd_Event,
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fe_dnd_Source*, XEvent* event);
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XP_BEGIN_PROTOS
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/* Register the given widget as a drop site. */
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extern void fe_dnd_CreateDrop(Widget w, fe_dnd_DropFunc func, void* closure);
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/* Inform the D&D internals that a drag is starting or dragging or dropping or
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finishing. This will call the callback functions on all the drop sites,
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which have to decide for themselves if the given drag event applies. The
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only trimming done is that _DROP events are not given to a widget unless
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the mouse is over that widget.
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Note that it is entirely up to the caller to create the source struct before
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calling this, and to destroy the source struct (and its widget) when
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done. */
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extern void fe_dnd_DoDrag(fe_dnd_Source* source, XEvent* event,
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fe_dnd_Event type);
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XP_END_PROTOS
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#endif /* __xfe_dragdrop_h_ */
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