154 lines
4.4 KiB
C++
154 lines
4.4 KiB
C++
/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2013-2018 KiCad Developers, see AUTHORS.txt for contributors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*
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*/
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/**
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* @file zoom_control.h
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* @brief ZOOM_CONTROLLER class definition.
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*/
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#ifndef __ZOOM_CONTROLLER_H
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#define __ZOOM_CONTROLLER_H
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#include <chrono>
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#include <memory>
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namespace KIGFX
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{
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/**
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* Class that handles the response of the zoom scale to external inputs
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*/
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class ZOOM_CONTROLLER
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{
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public:
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virtual ~ZOOM_CONTROLLER() = default;
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/**
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* Gets the scale factor produced by a given mousewheel rotation
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* @param aRotation rotation of the mouse wheel (this comes from
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* wxMouseEvent::GetWheelRotation())
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* @return the scale factor to scroll by
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*/
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virtual double GetScaleForRotation( int aRotation ) = 0;
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};
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/**
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* Class that zooms faster if scroll events happen very close together.
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*/
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class ACCELERATING_ZOOM_CONTROLLER : public ZOOM_CONTROLLER
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{
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public:
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/// The type of the acceleration timeout
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using TIMEOUT = std::chrono::milliseconds;
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/// The clock used for the timestamp (guaranteed to be monotonic)
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using CLOCK = std::chrono::steady_clock;
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/// The type of the time stamps
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using TIME_PT = std::chrono::time_point<CLOCK>;
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/// The default timeout, after which a another scroll will not be accelerated
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static constexpr TIMEOUT DEFAULT_TIMEOUT = std::chrono::milliseconds( 500 );
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/*
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* A class interface that provides timestamps for events
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*/
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class TIMESTAMP_PROVIDER
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{
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public:
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virtual ~TIMESTAMP_PROVIDER() = default;
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/*
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* @return the timestamp at the current time
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*/
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virtual TIME_PT GetTimestamp() = 0;
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};
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/**
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* @param aAccTimeout the timeout - if a scroll happens within this timeframe,
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* the zoom will be faster
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* @param aTimestampProv a provider for timestamps. If null, a default will
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* be provided, which is the main steady_clock (this is probably what you
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* want for real usage)
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*/
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ACCELERATING_ZOOM_CONTROLLER( const TIMEOUT& aAccTimeout = DEFAULT_TIMEOUT,
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TIMESTAMP_PROVIDER* aTimestampProv = nullptr );
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double GetScaleForRotation( int aRotation ) override;
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TIMEOUT GetTimeout() const
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{
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return m_accTimeout;
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}
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void SetTimeout( const TIMEOUT& aNewTimeout )
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{
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m_accTimeout = aNewTimeout;
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}
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private:
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/// The timestamp provider to use (might be provided externally)
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TIMESTAMP_PROVIDER* m_timestampProv;
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/// Any provider owned by this class (the default one, if used)
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std::unique_ptr<TIMESTAMP_PROVIDER> m_ownTimestampProv;
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/// The timestamp of the last event
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TIME_PT m_lastTimestamp;
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/// The timeout value
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TIMEOUT m_accTimeout;
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};
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/**
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* A ZOOM_CONTROLLER that zooms by a fixed factor based only on the magnitude
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* of the scroll wheel rotation.
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*/
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class CONSTANT_ZOOM_CONTROLLER : public ZOOM_CONTROLLER
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{
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public:
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/**
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* @param aScale a scaling parameter that adjusts the magnitude of the
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* scroll. This factor might be dependent on the platform for comfort.
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*/
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CONSTANT_ZOOM_CONTROLLER( double aScale );
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double GetScaleForRotation( int aRotation ) override;
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/// A suitable (magic) scale factor for GTK3 systems
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static constexpr double GTK3_SCALE = 0.002;
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/// A suitable (magic) scale factor for Mac systems
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static constexpr double MAC_SCALE = 0.01;
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private:
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/// The scale factor set by the constructor.
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double m_scale;
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};
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} // namespace KIGFX
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#endif
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