159 lines
3.2 KiB
C++
159 lines
3.2 KiB
C++
/*
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* \brief User state manager
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* \date 2005-11-16
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* \author Norman Feske <norman.feske@genode-labs.com>
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*/
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/*
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* Copyright (C) 2005-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__SCOUT__USER_STATE_H_
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#define _INCLUDE__SCOUT__USER_STATE_H_
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#include <scout/window.h>
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namespace Scout { class User_state; }
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class Scout::User_state : public Parent_element
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{
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private:
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/*
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* Noncopyable
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*/
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User_state(User_state const &);
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User_state &operator = (User_state const &);
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Element *_mfocus; /* element that owns the current mouse focus */
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Element *_active; /* currently activated element */
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Window *_window;
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Element *_root; /* root of element tree */
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int _key_cnt; /* number of currently pressed keys */
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Point _mouse_position { };
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Point _view_position { };
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/**
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* Assign new mouse focus element
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*/
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void _assign_mfocus(Element *e, int force = 0)
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{
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/* return if mouse focus did not change */
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if (!force && e == _mfocus) return;
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/* tell old mouse focus to release focus */
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if (_mfocus) _mfocus->mfocus(0);
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/* assign new current mouse focus */
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_mfocus = e;
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/* notify new mouse focus */
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if (_mfocus) _mfocus->mfocus(1);
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}
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public:
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/**
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* Constructor
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*/
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User_state(Window *window, Element *root, int vx, int vy)
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:
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_mfocus(0), _active(0), _window(window), _root(root),
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_key_cnt(0), _view_position(Point(vx, vy))
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{ }
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/**
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* Accessor functions
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*/
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Point mouse_position() const { return _mouse_position; }
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Point view_position() const { return _view_position; }
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/**
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* Update the current view offset
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*/
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void update_view_offset()
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{
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_view_position = Point(_window->view_x(), _window->view_y());
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}
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/**
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* Apply input event to mouse focus state
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*/
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void handle_event(Event const &ev)
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{
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_key_cnt += ev.type == Event::PRESS ? 1 : 0;
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_key_cnt -= ev.type == Event::RELEASE ? 1 : 0;
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if (_key_cnt < 0) _key_cnt = 0;
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if (_active)
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_active->handle_event(ev);
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/* find element under the mouse cursor */
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_mouse_position = ev.mouse_position;
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Element *e = _root->find(_mouse_position);
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switch (ev.type) {
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case Event::PRESS:
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if (_key_cnt != 1) break;
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if (!e) break;
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_active = e;
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_active->handle_event(ev);
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update_view_offset();
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_assign_mfocus(_root->find(ev.mouse_position), 1);
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break;
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case Event::RELEASE:
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if (_key_cnt == 0) {
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update_view_offset();
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_active = 0;
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_assign_mfocus(e);
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}
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break;
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case Event::MOTION:
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if (!_active && e) e->handle_event(ev);
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if (_key_cnt == 0)
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_assign_mfocus(e);
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break;
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case Event::WHEEL:
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if (_key_cnt == 0)
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_window->ypos(_window->ypos() + 23 * ev.mouse_position.y());
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break;
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default:
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break;
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}
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}
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/********************
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** Parent element **
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********************/
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void forget(Element const *e) override
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{
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if (_mfocus == e) _mfocus = 0;
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if (_active == e) _active = 0;
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}
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};
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#endif /* _INCLUDE__SCOUT__USER_STATE_H_ */
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