Also disable color buttons which don't apply for numeric scale bars

Make numeric scale bars respect font color and alignment settings (fix #7830)

src/app/composer/qgscomposerscalebarwidget.cpp

@@ -460,6 +460,8 @@ void QgsComposerScaleBarWidget::toggleStyleSpecificControls( const QString& styl
     mGroupBoxSegments->setCollapsed( true );
     mLabelBarSpaceSpinBox->setEnabled( false );
     mLineWidthSpinBox->setEnabled( false );
+    mColorPushButton->setEnabled( false );
+    mStrokeColorPushButton->setEnabled( false );
   }
   else
   {
@@ -468,6 +470,8 @@ void QgsComposerScaleBarWidget::toggleStyleSpecificControls( const QString& styl
     mGroupBoxSegments->setEnabled( true );
     mLabelBarSpaceSpinBox->setEnabled( true );
     mLineWidthSpinBox->setEnabled( true );
+    mColorPushButton->setEnabled( true );
+    mStrokeColorPushButton->setEnabled( true );
   }
 }
 

src/core/composer/qgscomposerscalebar.cpp

@@ -202,6 +202,13 @@ double QgsComposerScaleBar::mapWidth() const
   }
 }
 
+void QgsComposerScaleBar::setAlignment( Alignment a )
+{
+  mAlignment = a;
+  update();
+  emit itemChanged();
+}
+
 void QgsComposerScaleBar::setUnits( ScaleBarUnits u )
 {
   mUnits = u;
@@ -505,6 +512,12 @@ bool QgsComposerScaleBar::readXML( const QDomElement& itemElem, const QDomDocume
 
 void QgsComposerScaleBar::correctXPositionAlignment( double width, double widthAfter )
 {
+  //Don't adjust position for numeric scale bars:
+  if ( mStyle->name() == "Numeric" )
+  {
+    return;
+  }
+
   if ( mAlignment == Middle )
   {
     move( -( widthAfter - width ) / 2.0, 0 );

src/core/composer/qgscomposerscalebar.h

@@ -106,7 +106,7 @@ class CORE_EXPORT QgsComposerScaleBar: public QgsComposerItem
     Alignment alignment() const { return mAlignment; }
 
     /**@note: this method was added in version 1.8*/
-    void setAlignment( Alignment a ) { mAlignment = a; }
+    void setAlignment( Alignment a );
 
     /**@note: this method was added in version 1.9*/
     ScaleBarUnits units() const { return mUnits; }

src/core/composer/qgsnumericscalebarstyle.cpp

@@ -50,8 +50,35 @@ void QgsNumericScaleBarStyle::draw( QPainter* p, double xOffset ) const
 
   p->save();
   p->setFont( mScaleBar->font() );
-  p->setPen( QColor( 0, 0, 0 ) );
-  mScaleBar->drawText( p, mScaleBar->pen().widthF() + mScaleBar->boxContentSpace(), mScaleBar->boxContentSpace() + mScaleBar->fontAscentMillimeters( mScaleBar->font() ), scaleText(), mScaleBar->font() );
+  p->setPen( mScaleBar->fontColor() );
+
+  //call QgsComposerItem's pen() function, since that refers to the frame pen
+  //and QgsComposerScalebar's pen() function refers to the scale bar line width,
+  //which is not used for numeric scale bars. Divide the pen width by 2 since
+  //half the width of the frame is drawn outside the item.
+  double penWidth = mScaleBar->QgsComposerItem::pen().widthF() / 2.0;
+  double margin = mScaleBar->boxContentSpace();
+  //map scalebar alignment to Qt::AlignmentFlag type
+  Qt::AlignmentFlag hAlign;
+  switch ( mScaleBar->alignment() )
+  {
+    case QgsComposerScaleBar::Left:
+      hAlign = Qt::AlignLeft;
+      break;
+    case QgsComposerScaleBar::Middle:
+      hAlign = Qt::AlignHCenter;
+      break;
+    case QgsComposerScaleBar::Right:
+      hAlign = Qt::AlignRight;
+      break;
+    default:
+      hAlign = Qt::AlignLeft;
+      break;
+  }
+
+  //text destination is item's rect, excluding the margin and frame
+  QRectF painterRect( penWidth + margin, penWidth + margin, mScaleBar->rect().width() - 2 * penWidth - 2 * margin, mScaleBar->rect().height() - 2 * penWidth - 2 * margin );
+  mScaleBar->drawText( p, painterRect, scaleText(), mScaleBar->font(), hAlign, Qt::AlignTop );
 
   p->restore();
 }