genode/repos/demo/include/scout/user_state.h
Norman Feske b44f0554bd Adapt high-level components to new parent API
This patch adjusts the various users of the 'Child' API to the changes
on the account of the new non-blocking parent interface. It also removes
the use of the no-longer-available 'Connection::KEEP_OPEN' feature.

With the adjustment, we took the opportunity to redesign several
components to fit the non-blocking execution model much better, in
particular the demo applications.

Issue #2120
2016-11-30 13:37:03 +01:00

153 lines
3.1 KiB
C++

/*
* \brief User state manager
* \date 2005-11-16
* \author Norman Feske <norman.feske@genode-labs.com>
*/
/*
* Copyright (C) 2005-2013 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__SCOUT__USER_STATE_H_
#define _INCLUDE__SCOUT__USER_STATE_H_
#include <scout/window.h>
namespace Scout { class User_state; }
class Scout::User_state : public Parent_element
{
private:
Element *_mfocus; /* element that owns the current mouse focus */
Element *_active; /* currently activated element */
Window *_window;
Element *_root; /* root of element tree */
int _key_cnt; /* number of currently pressed keys */
Point _mouse_position;
Point _view_position;
/**
* Assign new mouse focus element
*/
void _assign_mfocus(Element *e, int force = 0)
{
/* return if mouse focus did not change */
if (!force && e == _mfocus) return;
/* tell old mouse focus to release focus */
if (_mfocus) _mfocus->mfocus(0);
/* assign new current mouse focus */
_mfocus = e;
/* notify new mouse focus */
if (_mfocus) _mfocus->mfocus(1);
}
public:
/**
* Constructor
*/
User_state(Window *window, Element *root, int vx, int vy)
:
_mfocus(0), _active(0), _window(window), _root(root),
_key_cnt(0), _view_position(Point(vx, vy))
{ }
/**
* Accessor functions
*/
Point mouse_position() const { return _mouse_position; }
Point view_position() const { return _view_position; }
/**
* Update the current view offset
*/
void update_view_offset()
{
_view_position = Point(_window->view_x(), _window->view_y());
}
/**
* Apply input event to mouse focus state
*/
void handle_event(Event const &ev)
{
_key_cnt += ev.type == Event::PRESS ? 1 : 0;
_key_cnt -= ev.type == Event::RELEASE ? 1 : 0;
if (_key_cnt < 0) _key_cnt = 0;
if (_active)
_active->handle_event(ev);
/* find element under the mouse cursor */
_mouse_position = ev.mouse_position;
Element *e = _root->find(_mouse_position);
switch (ev.type) {
case Event::PRESS:
if (_key_cnt != 1) break;
if (!e) break;
_active = e;
_active->handle_event(ev);
update_view_offset();
_assign_mfocus(_root->find(ev.mouse_position), 1);
break;
case Event::RELEASE:
if (_key_cnt == 0) {
update_view_offset();
_active = 0;
_assign_mfocus(e);
}
break;
case Event::MOTION:
if (!_active && e) e->handle_event(ev);
if (_key_cnt == 0)
_assign_mfocus(e);
break;
case Event::WHEEL:
if (_key_cnt == 0)
_window->ypos(_window->ypos() + 23 * ev.mouse_position.y());
break;
default:
break;
}
}
/********************
** Parent element **
********************/
void forget(Element const *e)
{
if (_mfocus == e) _mfocus = 0;
if (_active == e) _active = 0;
}
};
#endif /* _INCLUDE__SCOUT__USER_STATE_H_ */