Merge pull request #6786 from signedav/fix_condformat_alpha_BP

Backport to 3.0 Save and load alpha of conditional style color

Author: m-kuhn

src/core/qgsconditionalstyle.cpp

@@ -273,7 +273,9 @@ bool QgsConditionalStyle::writeXml( QDomNode &node, QDomDocument &doc, const Qgs
   stylesel.setAttribute( QStringLiteral( "rule" ), mRule );
   stylesel.setAttribute( QStringLiteral( "name" ), mName );
   stylesel.setAttribute( QStringLiteral( "background_color" ), mBackColor.name() );
+  stylesel.setAttribute( QStringLiteral( "background_color_alpha" ), mBackColor.alpha() );
   stylesel.setAttribute( QStringLiteral( "text_color" ), mTextColor.name() );
+  stylesel.setAttribute( QStringLiteral( "text_color_alpha" ), mTextColor.alpha() );
   QDomElement labelFontElem = QgsFontUtils::toXmlElement( mFont, doc, QStringLiteral( "font" ) );
   stylesel.appendChild( labelFontElem );
   if ( mSymbol )
@@ -290,8 +292,18 @@ bool QgsConditionalStyle::readXml( const QDomNode &node, const QgsReadWriteConte
   QDomElement styleElm = node.toElement();
   setRule( styleElm.attribute( QStringLiteral( "rule" ) ) );
   setName( styleElm.attribute( QStringLiteral( "name" ) ) );
-  setBackgroundColor( QColor( styleElm.attribute( QStringLiteral( "background_color" ) ) ) );
-  setTextColor( QColor( styleElm.attribute( QStringLiteral( "text_color" ) ) ) );
+  QColor bColor = QColor( styleElm.attribute( QStringLiteral( "background_color" ) ) );
+  if ( styleElm.hasAttribute( QStringLiteral( "background_color_alpha" ) ) )
+  {
+    bColor.setAlpha( styleElm.attribute( QStringLiteral( "background_color_alpha" ) ).toInt() );
+  }
+  setBackgroundColor( bColor );
+  QColor tColor = QColor( styleElm.attribute( QStringLiteral( "text_color" ) ) );
+  if ( styleElm.hasAttribute( QStringLiteral( "text_color_alpha" ) ) )
+  {
+    tColor.setAlpha( styleElm.attribute( QStringLiteral( "text_color_alpha" ) ).toInt() );
+  }
+  setTextColor( tColor );
   QgsFontUtils::setFromXmlChildNode( mFont, styleElm, QStringLiteral( "font" ) );
   QDomElement symbolElm = styleElm.firstChildElement( QStringLiteral( "symbol" ) );
   if ( !symbolElm.isNull() )