netsurf/riscos/mouse.c

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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/>.
*/
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/** \file
* 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.
*
* 2. Mouse tracking support, allowing clients to track the mouse while it
* remains in the current window and specify callbacks to be used
*
* - on Null Polls while the pointer is in the window, and
* - when the pointer leaves the window.
*/
#include <assert.h>
#include <oslib/wimp.h>
#include "utils/log.h"
#include "utils/utils.h"
#include "riscos/mouse.h"
#include "riscos/gui.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;
static bool ro_mouse_ignore_leaving_event = false;
/* Data for the wimp poll handler. */
static void (*ro_mouse_poll_end_callback)(wimp_leaving *leaving, void *data)
= NULL;
static void (*ro_mouse_poll_track_callback)(wimp_pointer *pointer, void *data)
= NULL;
static void *ro_mouse_poll_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 &&
ro_mouse_poll_track_callback == NULL)
return;
error = xwimp_get_pointer_info(&pointer);
if (error) {
LOG("xwimp_get_pointer_info: 0x%x: %s", error->errnum, error->errmess);
ro_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);
/* Process the window tracker, if one is active. */
if (ro_mouse_poll_track_callback != NULL)
ro_mouse_poll_track_callback(&pointer, ro_mouse_poll_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;
/* The Wimp sends a PointerLeaving event when Wimp_DragBox is called,
* so we mask out the next event that will come our way.
*/
ro_mouse_ignore_leaving_event = true;
}
/**
* Process Wimp_DragEnd events by terminating an active drag track and 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
ro_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;
}
/**
* Start tracking the mouse in a window, providing a function to be called on
* null polls and optionally one to be called when it leaves the window.
*
* \param *poll_end Callback for when the pointer leaves the window, or
* NULL for none. Claimants can receive *leaving==NULL if
* a new tracker is started before a PointerLeaving event
* is received.
* \param *poll_track Callback for mouse tracking while the pointer remains
* in the window, or NULL for none.
* \param *data Data to be passed to the callback functions, or NULL.
*/
void ro_mouse_track_start(void (*poll_end)(wimp_leaving *leaving, void *data),
void (*poll_track)(wimp_pointer *pointer, void *data),
void *data)
{
/* It should never be possible for the mouse to be in two windows
* at the same time! However, some third-party extensions to RISC OS
* appear to make this possible (MouseAxess being one), so in the
* event that there's still a claimant we tidy them up first and then
* log the fact in case there are any unexpected consequences.
*
* NB: The Poll End callback will get called with *leaving == NULL in
* this situation, as there's no PointerLeaving event to pass on.
*/
if (ro_mouse_poll_end_callback != NULL ||
ro_mouse_poll_track_callback != NULL ||
ro_mouse_poll_data != NULL) {
if (ro_mouse_poll_end_callback != NULL &&
ro_mouse_ignore_leaving_event == false)
ro_mouse_poll_end_callback(NULL, ro_mouse_poll_data);
LOG("Unexpected mouse track termination.");
ro_mouse_ignore_leaving_event = false;
ro_mouse_poll_end_callback = NULL;
ro_mouse_poll_track_callback = NULL;
ro_mouse_poll_data = NULL;
}
/* Now record details of the new claimant. */
ro_mouse_poll_end_callback = poll_end;
ro_mouse_poll_track_callback = poll_track;
ro_mouse_poll_data = data;
}
/**
* Process Wimp_PointerLeaving events by terminating an active mouse track and
* passing the details on to any registered event handler.
*
* If the ignore mask is set, we don't pass the event on to the client as it
* is assumed that it's a result of starting a Wimp_DragBox operation.
*
* \param *leaving The Wimp_PointerLeaving data block.
*/
void ro_mouse_pointer_leaving_window(wimp_leaving *leaving)
{
if (ro_mouse_poll_end_callback != NULL &&
ro_mouse_ignore_leaving_event == false)
ro_mouse_poll_end_callback(leaving, ro_mouse_poll_data);
ro_mouse_ignore_leaving_event = false;
/* Poll tracking is a one-shot event, so clear the data ready for
* another claimant.
*/
ro_mouse_poll_end_callback = NULL;
ro_mouse_poll_track_callback = NULL;
ro_mouse_poll_data = NULL;
}
/**
* Kill any tracking events if the data pointers match the supplied pointer.
*
* \param *data The data of the client to be killed.
*/
void ro_mouse_kill(void *data)
{
if (data == ro_mouse_drag_data) {
ro_mouse_drag_end_callback = NULL;
ro_mouse_drag_track_callback = NULL;
ro_mouse_drag_cancel_callback = NULL;
ro_mouse_drag_data = NULL;
}
if (data == ro_mouse_poll_data) {
ro_mouse_poll_end_callback = NULL;
ro_mouse_poll_track_callback = NULL;
ro_mouse_poll_data = NULL;
}
}
/**
* Return the desired polling interval to allow the mouse tracking to be
* carried out.
*
* \return Desired poll interval (0 for none required).
*/
os_t ro_mouse_poll_interval(void)
{
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if (ro_mouse_drag_track_callback != NULL)
return 4;
if (ro_mouse_poll_track_callback != NULL)
return 10;
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return 0;
}