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98 lines
2.2 KiB
C++
98 lines
2.2 KiB
C++
/*
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* \brief Nitpicker mode
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* \author Norman Feske
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* \date 2006-08-22
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*/
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/*
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* Copyright (C) 2006-2013 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 General Public License version 2.
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*/
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#ifndef _MODE_H_
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#define _MODE_H_
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class Session;
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class Mode
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{
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private:
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/*
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* Number of currently pressed keys. This counter is used to determine
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* if the user is dragging an item.
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*/
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unsigned _key_cnt = 0;
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Session *_focused_session = nullptr;
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Session *_next_focused_session = nullptr;
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protected:
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/*
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* True while a global key sequence is processed
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*/
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bool _global_key_sequence = false;
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public:
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virtual ~Mode() { }
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/**
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* Accessors
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*/
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bool drag() const { return _key_cnt > 0; }
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void inc_key_cnt() { _key_cnt++; }
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void dec_key_cnt() { _key_cnt--; }
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bool has_key_cnt(unsigned cnt) const { return cnt == _key_cnt; }
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bool key_pressed() const { return _key_cnt > 0; }
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Session *focused_session() { return _focused_session; }
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Session const *focused_session() const { return _focused_session; }
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virtual void focused_session(Session *session)
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{
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_focused_session = session;
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_next_focused_session = session;
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}
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bool focused(Session const &session) const { return &session == _focused_session; }
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void next_focused_session(Session *session) { _next_focused_session = session; }
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/**
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* Apply pending focus-change request that was issued during drag state
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*/
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void apply_pending_focus_change()
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{
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/*
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* Defer focus changes to a point where no drag operation is in
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* flight because otherwise, the involved sessions would obtain
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* inconsistent press and release events. However, focus changes
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* during global key sequences are fine.
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*/
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if (key_pressed() && !_global_key_sequence)
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return;
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if (_focused_session != _next_focused_session)
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_focused_session = _next_focused_session;
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}
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/**
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* Discard all references to specified view
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*/
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virtual void forget(Session const &session)
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{
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if (&session == _focused_session) _focused_session = nullptr;
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if (&session == _next_focused_session) _next_focused_session = nullptr;
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}
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};
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#endif
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