QGIS API Documentation
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src
core
qgsscreenproperties.h
Go to the documentation of this file.
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/***************************************************************************
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qgsscreenproperties.h
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---------------
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Date : June 2023
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Copyright : (C) 2023 by Nyall Dawson
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Email : nyall dot dawson at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifndef QGSSCREENPROPERTIES_H
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#define QGSSCREENPROPERTIES_H
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#include "qgis_core.h"
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#include "
qgis_sip.h
"
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#include "
qgis.h
"
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class
QScreen;
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class
QgsRenderContext
;
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class
CORE_EXPORT
QgsScreenProperties
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{
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public
:
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QgsScreenProperties
();
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explicit
QgsScreenProperties
(
const
QScreen *screen );
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bool
operator==
(
const
QgsScreenProperties
&other )
const
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{
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return
mValid == other.mValid
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&& mDevicePixelRatio == other.mDevicePixelRatio
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&& mPhysicalDpi == other.mPhysicalDpi;
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}
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bool
operator!=
(
const
QgsScreenProperties
&other )
const
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{
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return
!( *
this
== other );
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}
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bool
isValid
()
const
{
return
mValid; }
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double
devicePixelRatio
()
const
{
return
mDevicePixelRatio; }
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void
setDevicePixelRatio(
double
ratio );
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double
physicalDpi
()
const
{
return
mPhysicalDpi; }
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void
setPhysicalDpi(
double
dpi );
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void
updateRenderContextForScreen(
QgsRenderContext
&context )
const
;
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private
:
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bool
mValid =
false
;
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double
mDevicePixelRatio = 1;
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double
mPhysicalDpi = 96;
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};
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CORE_EXPORT
inline
uint
qHash
(
const
QgsScreenProperties
&properties )
SIP_SKIP
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{
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return
qHash
( properties.devicePixelRatio() ) +
qHash
( properties.physicalDpi() );
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}
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#endif
// QGSSCREENPROPERTIES_H
QgsRenderContext
Contains information about the context of a rendering operation.
Definition
qgsrendercontext.h:62
QgsScreenProperties
Stores properties relating to a screen.
Definition
qgsscreenproperties.h:36
QgsScreenProperties::QgsScreenProperties
QgsScreenProperties()
Constructor for invalid properties.
QgsScreenProperties::physicalDpi
double physicalDpi() const
This property holds the number of physical dots or pixels per inch.
Definition
qgsscreenproperties.h:101
QgsScreenProperties::devicePixelRatio
double devicePixelRatio() const
Returns the ratio between physical pixels and device-independent pixels for the screen.
Definition
qgsscreenproperties.h:77
QgsScreenProperties::isValid
bool isValid() const
Returns true if the properties are valid.
Definition
qgsscreenproperties.h:66
QgsScreenProperties::operator==
bool operator==(const QgsScreenProperties &other) const
Definition
qgsscreenproperties.h:51
QgsScreenProperties::operator!=
bool operator!=(const QgsScreenProperties &other) const
Definition
qgsscreenproperties.h:58
qgis.h
qgis_sip.h
SIP_SKIP
#define SIP_SKIP
Definition
qgis_sip.h:126
qHash
CORE_EXPORT uint qHash(const QgsScreenProperties &properties)
Returns a hash for a screen properties.
Definition
qgsscreenproperties.h:134
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