kicad/include/gal/dpi_scaling.h

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2019 KiCad Developers, see AUTHORS.TXT for contributors.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef DPI_SCALING__H
#define DPI_SCALING__H
#include <wx/window.h>
class COMMON_SETTINGS;
/**
* Class to handle configuration and automatic determination of the DPI
* scale to use for canvases. This has several sources and the availability of
* some of them are platform dependent.
*/
class DPI_SCALING
{
public:
/**
* Construct a DPI scale provider.
*
* @param aConfig the config store to check for a user value (can be nullptr,
* in which case on automatically determined values are considered)
* @param aWindow a WX window to use for automatic DPI determination
* @return the scaling factor (1.0 = no scaling)
*/
DPI_SCALING( COMMON_SETTINGS* aConfig, const wxWindow* aWindow );
/**
* Get the DPI scale from all known sources in order:
*
* * user config, if given
* * user's environment variables, if set and according to platform
* * WX's internal determination of the DPI scaling (WX > 3.1)
*/
double GetScaleFactor() const;
/**
* Is the current value auto scaled, or is it user-set in the config
*/
bool GetCanvasIsAutoScaled() const;
/**
* Set the common DPI config in a given config object
*
* The encoding of the automatic/manual nature of the config is handled internally.
*
* @param aAuto store a value meaning "no user-set scale"
* @param aValue the value to store (ignored if aAuto set)
*/
void SetDpiConfig( bool aAuto, double aValue );
/*
* Get the maximum scaling factor that should be presented to the user.
* This is only advisory, it has no real technical use other than for validation.
*/
static double GetMaxScaleFactor();
/*
* Get the minimum scaling factor that should be presented to the user.
* This is only advisory, it has no real technical use other than for validation.
*/
static double GetMinScaleFactor();
/**
* Get the "default" scaling factor to use if not other config is available
*/
static double GetDefaultScaleFactor();
private:
/**
* The configuration object to use to get/set user setting. nullptr
* if only automatic options are wanted
*/
COMMON_SETTINGS* m_config;
/**
* The WX window to use for WX's automatic DPI checking
*/
const wxWindow* m_window;
};
#endif // DPI_SCALING__H