mirror of
https://github.com/netsurf-browser/netsurf
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132 lines
3.8 KiB
C
132 lines
3.8 KiB
C
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/*
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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 mouse.c
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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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#include "oslib/wimp.h"
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#include "riscos/mouse.h"
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#include "utils/log.h"
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#include "utils/utils.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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/**
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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 /* && no trackers */)
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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",
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error->errnum, error->errmess));
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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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}
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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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}
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/**
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* Process Wimp_DragEnd events by passing the details on to any registered
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* 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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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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