From 31316a914ee7253fdc495d48b092ed899432a305 Mon Sep 17 00:00:00 2001
From: Alexander Bruy <alexander.bruy@gmail.com>
Date: Thu, 23 Apr 2020 20:10:33 +0300
Subject: [PATCH] [raster calculator] enable Ok button only when expression and
 output are set (fix #30420)

---
 src/app/qgsrastercalcdialog.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/app/qgsrastercalcdialog.cpp b/src/app/qgsrastercalcdialog.cpp
index 6fed53bb0ab..b3bd21c7263 100644
--- a/src/app/qgsrastercalcdialog.cpp
+++ b/src/app/qgsrastercalcdialog.cpp
@@ -81,6 +81,8 @@ QgsRasterCalcDialog::QgsRasterCalcDialog( QgsRasterLayer *rasterLayer, QWidget *
     mCrsSelector->setCrs( rasterLayer->crs() );
   }
 
+  mButtonBox->button( QDialogButtonBox::Ok )->setEnabled( false );
+
   //add supported output formats
   insertAvailableOutputFormats();
   insertAvailableRasterBands();