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Add a setting to be able to disable preview jobs in main canvas

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Can be used by power users to disable preview jobs, for very slow datasources
(especially when network bandwidth is saturated), where it decreases performance.

More clever approaches have been discussed per https://github.com/qgis/QGIS/pull/5645
and https://lists.osgeo.org/pipermail/qgis-developer/2017-November/050524.html,
but at least offer this setting for now, pending further improvements.
This commit is contained in:
Even Rouault 2017-11-16 00:27:39 +01:00
parent 581d0d30ca
commit ca8d82ff4c
1 changed files with 7 additions and 1 deletions
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8
src/app/qgisapp.cpp
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@ -717,7 +717,13 @@ QgisApp::QgisApp( QSplashScreen *splash, bool restorePlugins, bool skipVersionCh
connect( mMapCanvas, &QgsMapCanvas::messageEmitted, this, &QgisApp::displayMessage );
mMapCanvas->setWhatsThis( tr( "Map canvas. This is where raster and vector "
"layers are displayed when added to the map" ) );
mMapCanvas->setPreviewJobsEnabled( true );
if ( settings.value( QStringLiteral( "qgis/main_canvas_preview_jobs" ) ).isNull() )
{
// So that it appears in advanced settings
settings.setValue( QStringLiteral( "qgis/main_canvas_preview_jobs" ), true );
}
mMapCanvas->setPreviewJobsEnabled( settings.value( QStringLiteral( "qgis/main_canvas_preview_jobs" ), true ).toBool() );
// set canvas color right away
int myRed = settings.value( QStringLiteral( "qgis/default_canvas_color_red" ), 255 ).toInt();