mirror of
https://github.com/netsurf-browser/netsurf
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284 lines
8.1 KiB
C
284 lines
8.1 KiB
C
/*
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* Copyright 2013 Stephen Fryatt <stevef@netsurf-browser.org>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf 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; version 2 of the License.
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*
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* NetSurf 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** \file
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* Mouse dragging and tracking support implementation.
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*
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* Two different functions are provided:-
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*
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* 1. Wimp_DragBox support, allowing clients to start a drag and specify
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* callbacks to be used
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*
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* - on Null Polls while the drag is active,
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* - when the drag terminates with Event_DragEnd, and
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* - when the drag terminates with Escape being pressed.
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*
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* 2. Mouse tracking support, allowing clients to track the mouse while it
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* remains in the current window and specify callbacks to be used
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*
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* - on Null Polls while the pointer is in the window, and
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* - when the pointer leaves the window.
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*/
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#include <assert.h>
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#include <oslib/wimp.h>
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#include "utils/log.h"
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#include "utils/utils.h"
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#include "riscos/mouse.h"
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#include "riscos/gui.h"
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/* Data for the wimp drag handler. */
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static void (*ro_mouse_drag_end_callback)(wimp_dragged *dragged, void *data)
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= NULL;
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static void (*ro_mouse_drag_track_callback)(wimp_pointer *pointer, void *data)
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= NULL;
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static void (*ro_mouse_drag_cancel_callback)(void *data) = NULL;
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static void *ro_mouse_drag_data = NULL;
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static bool ro_mouse_ignore_leaving_event = false;
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/* Data for the wimp poll handler. */
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static void (*ro_mouse_poll_end_callback)(wimp_leaving *leaving, void *data)
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= NULL;
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static void (*ro_mouse_poll_track_callback)(wimp_pointer *pointer, void *data)
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= NULL;
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static void *ro_mouse_poll_data = NULL;
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/**
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* Process Null polls for any drags and mouse trackers that are currently
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* active.
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*/
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void ro_mouse_poll(void)
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{
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wimp_pointer pointer;
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os_error *error;
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/* If no trackers are active, just exit. */
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if (ro_mouse_drag_track_callback == NULL &&
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ro_mouse_poll_track_callback == NULL)
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return;
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error = xwimp_get_pointer_info(&pointer);
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if (error) {
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LOG("xwimp_get_pointer_info: 0x%x: %s", error->errnum, error->errmess);
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ro_warn_user("WimpError", error->errmess);
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return;
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}
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/* Process the drag tracker, if one is active. */
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if (ro_mouse_drag_track_callback != NULL)
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ro_mouse_drag_track_callback(&pointer, ro_mouse_drag_data);
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/* Process the window tracker, if one is active. */
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if (ro_mouse_poll_track_callback != NULL)
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ro_mouse_poll_track_callback(&pointer, ro_mouse_poll_data);
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}
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/**
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* Start a drag, providing a function to be called when the Wimp_DragEnd event
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* is received and optionally a tracking function to be called on null polls
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* in between times.
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*
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* \param *drag_end Callback for when the drag terminates, or NULL for none.
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* \param *drag_track Callback for mouse tracking during the drag, or NULL for
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* none.
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* \param *drag_cancel Callback for cancelling the drag, or NULL if the drag
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* can't be cancelled.
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* \param *data Data to be passed to the callback functions, or NULL.
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*/
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void ro_mouse_drag_start(void (*drag_end)(wimp_dragged *dragged, void *data),
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void (*drag_track)(wimp_pointer *pointer, void *data),
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void (*drag_cancel)(void *data), void *data)
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{
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/* A drag should never be started when one is already in progress. */
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assert(ro_mouse_drag_end_callback == NULL &&
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ro_mouse_drag_track_callback == NULL &&
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ro_mouse_drag_cancel_callback == NULL &&
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ro_mouse_drag_data == NULL);
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ro_mouse_drag_end_callback = drag_end;
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ro_mouse_drag_track_callback = drag_track;
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ro_mouse_drag_cancel_callback = drag_cancel;
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ro_mouse_drag_data = data;
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/* The Wimp sends a PointerLeaving event when Wimp_DragBox is called,
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* so we mask out the next event that will come our way.
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*/
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ro_mouse_ignore_leaving_event = true;
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}
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/**
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* Process Wimp_DragEnd events by terminating an active drag track and passing
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* the details on to any registered event handler.
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*
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* \param *dragged The Wimp_DragEnd data block.
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*/
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void ro_mouse_drag_end(wimp_dragged *dragged)
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{
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if (ro_mouse_drag_end_callback != NULL)
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ro_mouse_drag_end_callback(dragged, ro_mouse_drag_data);
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else
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ro_warn_user("WimpError", "No callback");
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/* Wimp_DragEnd is a one-shot event, so clear the data ready for
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* another claimant.
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*/
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ro_mouse_drag_end_callback = NULL;
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ro_mouse_drag_track_callback = NULL;
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ro_mouse_drag_cancel_callback = NULL;
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ro_mouse_drag_data = NULL;
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}
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/**
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* Start tracking the mouse in a window, providing a function to be called on
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* null polls and optionally one to be called when it leaves the window.
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*
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* \param *poll_end Callback for when the pointer leaves the window, or
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* NULL for none. Claimants can receive *leaving==NULL if
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* a new tracker is started before a PointerLeaving event
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* is received.
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* \param *poll_track Callback for mouse tracking while the pointer remains
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* in the window, or NULL for none.
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* \param *data Data to be passed to the callback functions, or NULL.
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*/
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void ro_mouse_track_start(void (*poll_end)(wimp_leaving *leaving, void *data),
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void (*poll_track)(wimp_pointer *pointer, void *data),
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void *data)
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{
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/* It should never be possible for the mouse to be in two windows
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* at the same time! However, some third-party extensions to RISC OS
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* appear to make this possible (MouseAxess being one), so in the
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* event that there's still a claimant we tidy them up first and then
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* log the fact in case there are any unexpected consequences.
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*
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* NB: The Poll End callback will get called with *leaving == NULL in
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* this situation, as there's no PointerLeaving event to pass on.
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*/
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if (ro_mouse_poll_end_callback != NULL ||
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ro_mouse_poll_track_callback != NULL ||
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ro_mouse_poll_data != NULL) {
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if (ro_mouse_poll_end_callback != NULL &&
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ro_mouse_ignore_leaving_event == false)
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ro_mouse_poll_end_callback(NULL, ro_mouse_poll_data);
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LOG("Unexpected mouse track termination.");
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ro_mouse_ignore_leaving_event = false;
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ro_mouse_poll_end_callback = NULL;
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ro_mouse_poll_track_callback = NULL;
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ro_mouse_poll_data = NULL;
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}
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/* Now record details of the new claimant. */
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ro_mouse_poll_end_callback = poll_end;
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ro_mouse_poll_track_callback = poll_track;
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ro_mouse_poll_data = data;
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}
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/**
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* Process Wimp_PointerLeaving events by terminating an active mouse track and
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* passing the details on to any registered event handler.
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*
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* If the ignore mask is set, we don't pass the event on to the client as it
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* is assumed that it's a result of starting a Wimp_DragBox operation.
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*
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* \param *leaving The Wimp_PointerLeaving data block.
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*/
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void ro_mouse_pointer_leaving_window(wimp_leaving *leaving)
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{
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if (ro_mouse_poll_end_callback != NULL &&
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ro_mouse_ignore_leaving_event == false)
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ro_mouse_poll_end_callback(leaving, ro_mouse_poll_data);
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ro_mouse_ignore_leaving_event = false;
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/* Poll tracking is a one-shot event, so clear the data ready for
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* another claimant.
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*/
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ro_mouse_poll_end_callback = NULL;
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ro_mouse_poll_track_callback = NULL;
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ro_mouse_poll_data = NULL;
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}
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/**
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* Kill any tracking events if the data pointers match the supplied pointer.
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*
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* \param *data The data of the client to be killed.
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*/
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void ro_mouse_kill(void *data)
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{
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if (data == ro_mouse_drag_data) {
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ro_mouse_drag_end_callback = NULL;
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ro_mouse_drag_track_callback = NULL;
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ro_mouse_drag_cancel_callback = NULL;
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ro_mouse_drag_data = NULL;
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}
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if (data == ro_mouse_poll_data) {
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ro_mouse_poll_end_callback = NULL;
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ro_mouse_poll_track_callback = NULL;
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ro_mouse_poll_data = NULL;
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}
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}
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/**
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* Return the desired polling interval to allow the mouse tracking to be
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* carried out.
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*
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* \return Desired poll interval (0 for none required).
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*/
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os_t ro_mouse_poll_interval(void)
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{
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if (ro_mouse_drag_track_callback != NULL)
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return 4;
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if (ro_mouse_poll_track_callback != NULL)
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return 10;
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return 0;
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}
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