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/*
$Id: inputbuffer.h,v 1.8 2001/09/22 15:52:12 plasmoid Exp $
------------------------------------------------------------------------
ClanLib, the platform independent game SDK.
This library is distributed under the GNU LIBRARY GENERAL PUBLIC LICENSE
version 2. See COPYING for details.
For a total list of contributers see CREDITS.
See http://www.clanlib.org
------------------------------------------------------------------------
*/
//! clanDisplay="Input"
//! header=display.h
#ifndef header_inputbuffer
#define header_inputbuffer
#include <queue>
#include "key.h"
#include "../../signals.h"
class CL_Component;
//: Input buffer interface.
//- Use this class to read buffered keys from the keyboard (or any other device).
class CL_InputBuffer
{
public:
//! Construction:
//: Constructs an input buffer that attaches itself to the first keyboard.
CL_InputBuffer();
//: Constructs an input buffer that attaches itself to the specified device.
CL_InputBuffer(CL_InputDevice *device);
//: Constructs an input buffer that attaches itself to the specified signals.
//: Use it to buffer input from a GUI component.
CL_InputBuffer(
CL_Signal_v4<CL_Component *, CL_InputDevice *, CL_Key, bool &> &sig_key_down,
CL_Signal_v3<CL_Component *, CL_InputDevice *, CL_Key> &sig_key_up);
//: Input Buffer Destructor
virtual ~CL_InputBuffer();
//! Operations:
//: Returns the next key in the buffer, but unlike get_key() it does not
//: pop it from the input buffer.
CL_Key peek_key() const;
//: Pops the next key in the buffer and returns it.
CL_Key get_key();
//: Returns number of keys still available in the buffer.
//- Returns - Number of key values lefts in buffer.
int keys_left();
//: Clears the buffer. After this, the buffer will not contain any keys.
void clear();
//! Implementation:
private:
CL_Slot slot_button_press;
CL_Slot slot_button_release;
CL_Slot slot_key_down;
CL_Slot slot_key_up;
void on_button_press(CL_InputDevice *device, const CL_Key &key);
void on_button_release(CL_InputDevice *device, const CL_Key &key);
void on_key_down(CL_Component *, CL_InputDevice *device, CL_Key key, bool &retval);
void on_key_up(CL_Component *, CL_InputDevice *device, CL_Key key);
std::queue<CL_Key> buffer;
CL_InputDevice *device;
};
#endif
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