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/*
* Copyright 2013 Stephen Fryatt <stevef@netsurf-browser.org>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/** \file mouse.c
* Mouse dragging and tracking support (implementation).
*
* Two different functions are provided:-
*
* 1. Wimp_DragBox support, allowing clients to start a drag and specify
* callbacks to be used
*
* - on Null Polls while the drag is active,
* - when the drag terminates with Event_DragEnd, and
* - when the drag terminates with Escape being pressed.
*/
#include "oslib/wimp.h"
#include "riscos/mouse.h"
#include "utils/log.h"
#include "utils/utils.h"
/* Data for the wimp drag handler. */
static void (*ro_mouse_drag_end_callback)(wimp_dragged *dragged, void *data)
= NULL;
static void (*ro_mouse_drag_track_callback)(wimp_pointer *pointer, void *data)
= NULL;
static void (*ro_mouse_drag_cancel_callback)(void *data) = NULL;
static void *ro_mouse_drag_data = NULL;
/**
* Process Null polls for any drags and mouse trackers that are currently
* active.
*/
void ro_mouse_poll(void)
{
wimp_pointer pointer;
os_error *error;
/* If no trackers are active, just exit. */
if (ro_mouse_drag_track_callback == NULL /* && no trackers */)
return;
error = xwimp_get_pointer_info(&pointer);
if (error) {
LOG(("xwimp_get_pointer_info: 0x%x: %s",
error->errnum, error->errmess));
warn_user("WimpError", error->errmess);
return;
}
/* Process the drag tracker, if one is active. */
if (ro_mouse_drag_track_callback != NULL)
ro_mouse_drag_track_callback(&pointer, ro_mouse_drag_data);
}
/**
* Start a drag, providing a function to be called when the Wimp_DragEnd event
* is received and optionally a tracking function to be called on null polls
* in between times.
*
* \param *drag_end Callback for when the drag terminates, or NULL for none.
* \param *drag_track Callback for mouse tracking during the drag, or NULL for
* none.
* \param *drag_cancel Callback for cancelling the drag, or NULL if the drag
* can't be cancelled.
* \param *data Data to be passed to the callback functions, or NULL.
*/
void ro_mouse_drag_start(void (*drag_end)(wimp_dragged *dragged, void *data),
void (*drag_track)(wimp_pointer *pointer, void *data),
void (*drag_cancel)(void *data), void *data)
{
/* A drag should never be started when one is already in progress. */
assert(ro_mouse_drag_end_callback == NULL &&
ro_mouse_drag_track_callback == NULL &&
ro_mouse_drag_cancel_callback == NULL &&
ro_mouse_drag_data == NULL);
ro_mouse_drag_end_callback = drag_end;
ro_mouse_drag_track_callback = drag_track;
ro_mouse_drag_cancel_callback = drag_cancel;
ro_mouse_drag_data = data;
}
/**
* Process Wimp_DragEnd events by passing the details on to any registered
* event handler.
*
* \param *dragged The Wimp_DragEnd data block.
*/
void ro_mouse_drag_end(wimp_dragged *dragged)
{
if (ro_mouse_drag_end_callback != NULL)
ro_mouse_drag_end_callback(dragged, ro_mouse_drag_data);
else
warn_user("WimpError", "No callback");
/* Wimp_DragEnd is a one-shot event, so clear the data ready for
* another claimant.
*/
ro_mouse_drag_end_callback = NULL;
ro_mouse_drag_track_callback = NULL;
ro_mouse_drag_cancel_callback = NULL;
ro_mouse_drag_data = NULL;
}
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