98 lines
2.2 KiB
C++
98 lines
2.2 KiB
C++
/*
|
|
* \brief Nitpicker mode
|
|
* \author Norman Feske
|
|
* \date 2006-08-22
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2006-2017 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU Affero General Public License version 3.
|
|
*/
|
|
|
|
#ifndef _MODE_H_
|
|
#define _MODE_H_
|
|
|
|
class Session;
|
|
|
|
class Mode
|
|
{
|
|
private:
|
|
|
|
/*
|
|
* Number of currently pressed keys. This counter is used to determine
|
|
* if the user is dragging an item.
|
|
*/
|
|
unsigned _key_cnt = 0;
|
|
|
|
Session *_focused_session = nullptr;
|
|
|
|
Session *_next_focused_session = nullptr;
|
|
|
|
protected:
|
|
|
|
/*
|
|
* True while a global key sequence is processed
|
|
*/
|
|
bool _global_key_sequence = false;
|
|
|
|
public:
|
|
|
|
virtual ~Mode() { }
|
|
|
|
/**
|
|
* Accessors
|
|
*/
|
|
bool drag() const { return _key_cnt > 0; }
|
|
|
|
void inc_key_cnt() { _key_cnt++; }
|
|
void dec_key_cnt() { _key_cnt--; }
|
|
|
|
unsigned key_cnt() const { return _key_cnt; }
|
|
|
|
bool key_pressed() const { return _key_cnt > 0; }
|
|
|
|
Session *focused_session() { return _focused_session; }
|
|
Session const *focused_session() const { return _focused_session; }
|
|
|
|
virtual void focused_session(Session *session)
|
|
{
|
|
_focused_session = session;
|
|
_next_focused_session = session;
|
|
}
|
|
|
|
bool focused(Session const &session) const { return &session == _focused_session; }
|
|
|
|
void next_focused_session(Session *session) { _next_focused_session = session; }
|
|
|
|
/**
|
|
* Apply pending focus-change request that was issued during drag state
|
|
*/
|
|
void apply_pending_focus_change()
|
|
{
|
|
/*
|
|
* Defer focus changes to a point where no drag operation is in
|
|
* flight because otherwise, the involved sessions would obtain
|
|
* inconsistent press and release events. However, focus changes
|
|
* during global key sequences are fine.
|
|
*/
|
|
if (key_pressed() && !_global_key_sequence)
|
|
return;
|
|
|
|
if (_focused_session != _next_focused_session)
|
|
_focused_session = _next_focused_session;
|
|
}
|
|
|
|
/**
|
|
* Discard all references to specified view
|
|
*/
|
|
virtual void forget(Session const &session)
|
|
{
|
|
if (&session == _focused_session) _focused_session = nullptr;
|
|
if (&session == _next_focused_session) _next_focused_session = nullptr;
|
|
}
|
|
};
|
|
|
|
#endif
|