97 lines
1.8 KiB
C++
97 lines
1.8 KiB
C++
/*
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* \brief Implementation of fading icon
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* \date 2005-10-24
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* \author Norman Feske <norman.feske@genode-labs.com>
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*
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* Fading icons are presented at a alpha value of 50 percent.
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* When getting the mouse focus, we smoothly increase the
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* alpha value to 100 percent.
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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 _FADE_ICON_H_
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#define _FADE_ICON_H_
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#include <scout/misc_math.h>
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#include <scout/fader.h>
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#include "widgets.h"
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namespace Scout { template <typename PT, int W, int H> class Fade_icon; }
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template <typename PT, int W, int H>
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class Scout::Fade_icon : public Fader, public Icon<PT, W, H>
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{
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private:
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int _default_alpha = 100;
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int _focus_alpha = 255;
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public:
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/**
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* Constructor
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*/
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Fade_icon()
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{
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_curr_value = _dst_value = 100;
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step(12);
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}
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/**
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* Accessor functions
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*/
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int default_alpha() { return _default_alpha; }
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/**
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* Define alpha value for unfocused icon
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*/
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void default_alpha(int alpha ) { _default_alpha = alpha; }
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/**
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* Define alpha value when having the mouse focus
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*/
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void focus_alpha(int alpha) { _focus_alpha = alpha; }
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/**
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* Tick interface
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*/
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int on_tick() override
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{
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/* call on_tick function of the fader */
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if (Fader::on_tick() == 0) return 0;
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Icon<PT, W,H>::alpha(_curr_value);
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return 1;
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}
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/**
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* Icon interface
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*/
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void alpha(int alpha) override
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{
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_curr_value = alpha;
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Icon<PT, W, H>::alpha(alpha);
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}
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/**
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* Element interface
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*/
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void mfocus(int flag) override
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{
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Icon<PT, W, H>::mfocus(flag);
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int step = _focus_alpha - _default_alpha;
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step *= flag ? 26 : 19;
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fade_to(flag ? _focus_alpha : _default_alpha, step >> 8);
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}
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};
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#endif /* _FADE_ICON_H_ */
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