118 lines
3.1 KiB
C++
118 lines
3.1 KiB
C++
/*
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* \brief Nitpicker session interface
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* \author Norman Feske
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* \date 2006-08-09
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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 _SESSION_H_
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#define _SESSION_H_
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/* Genode includes */
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#include <util/list.h>
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/* local includes */
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#include "string.h"
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class Texture;
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class View;
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class Session;
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namespace Input { class Event; }
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typedef Genode::List<Session> Session_list;
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class Session : public Session_list::Element
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{
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public:
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enum { LABEL_LEN = 64 }; /* max. length of session label */
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private:
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char _label[LABEL_LEN];
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Color _color;
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Texture const &_texture;
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View *_background;
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int _v_offset;
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unsigned char const *_input_mask;
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bool const _stay_top;
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public:
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/**
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* Constructor
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*
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* \param label textual session label as null-terminated
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* ASCII string
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* \param texture texture containing the session's pixel
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* representation
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* \param v_offset vertical screen offset of session
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* \param input_mask input mask buffer containing a byte value per
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* texture pixel, which describes the policy of
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* handling user input referring to the pixel.
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* If set to zero, the input is passed through
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* the view such that it can be handled by one of
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* the subsequent views in the view stack. If set
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* to one, the input is consumed by the view. If
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* 'input_mask' is a null pointer, user input is
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* unconditionally consumed by the view.
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*/
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Session(char const *label, Texture const &texture, int v_offset,
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Color color, unsigned char const *input_mask = 0,
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bool stay_top = false)
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:
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_color(color), _texture(texture), _background(0),
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_v_offset(v_offset), _input_mask(input_mask), _stay_top(stay_top) {
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Nitpicker::strncpy(_label, label, sizeof(_label)); }
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virtual ~Session() { }
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virtual void submit_input_event(Input::Event ev) = 0;
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char const *label() const { return _label; }
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Texture const &texture() const { return _texture; }
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Color color() const { return _color; }
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View *background() const { return _background; }
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void background(View *background) { _background = background; }
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bool stay_top() const { return _stay_top; }
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/**
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* Return true if session uses an alpha channel
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*/
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bool uses_alpha() const { return _texture.alpha(); }
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/**
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* Return vertical offset of session
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*/
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int v_offset() const { return _v_offset; }
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/**
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* Return input mask value at specified buffer position
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*/
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unsigned char input_mask_at(Point p) const
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{
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if (!_input_mask) return 0;
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/* check boundaries */
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if (p.x() < 0 || p.x() >= _texture.w()
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|| p.y() < 0 || p.y() >= _texture.h())
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return 0;
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return _input_mask[p.y()*_texture.w() + p.x()];
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}
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};
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#endif
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