[Style dock] Move layer label inside widget

Author: NathanW2

src/app/qgisapp.cpp

@@ -5503,8 +5503,6 @@ void QgisApp::setMapStyleDockLayer( QgsMapLayer* layer )
   // the extra work if it's not needed
   if ( mMapStylingDock->isVisible() )
     mMapStyleWidget->setLayer( layer );
-
-  mMapStylingDock->setWindowTitle( tr( "Map Styling - %1" ).arg( layer->name() ) );
 }
 
 void QgisApp::mapStyleDock()

src/app/qgsmapstylingwidget.cpp

@@ -23,6 +23,9 @@ QgsMapStylingWidget::QgsMapStylingWidget( QgsMapCanvas* canvas, QWidget *parent
   mNotSupportedPage = mStackedWidget->addWidget( new QLabel( "Not supported currently" ) );
   mVectorPage = mStackedWidget->addWidget( mMapStyleTabs );
 
+  mLayerTitleLabel = new QLabel();
+  mLayerTitleLabel->setAlignment( Qt::AlignHCenter );
+  layout->addWidget( mLayerTitleLabel );
   layout->addWidget( mStackedWidget );
   mButtonBox = new QDialogButtonBox( QDialogButtonBox::Reset | QDialogButtonBox::Apply );
   mLiveApplyCheck = new QCheckBox( "Live update" );
@@ -58,10 +61,16 @@ QgsMapStylingWidget::QgsMapStylingWidget( QgsMapCanvas* canvas, QWidget *parent
 void QgsMapStylingWidget::setLayer( QgsMapLayer *layer )
 {
   if ( !layer )
+  {
+    mLayerTitleLabel->setText( "" );
+    mStackedWidget->setCurrentIndex( mNotSupportedPage );
     return;
+  }
 
   mBlockAutoApply = true;
 
+  mLayerTitleLabel->setText( layer->name() );
+
   mCurrentLayer = layer;
 
   if ( layer->type() == QgsMapLayer::VectorLayer )

src/app/qgsmapstylingwidget.h

@@ -2,6 +2,7 @@
 #define QGSMAPSTYLESDOCK_H
 
 #include <QWidget>
+#include <QLabel>
 #include <QTabWidget>
 #include <QStackedWidget>
 #include <QDialogButtonBox>
@@ -34,6 +35,7 @@ class APP_EXPORT QgsMapStylingWidget : public QWidget
     int mLabelTabIndex;
     QgsMapCanvas* mMapCanvas;
     bool mBlockAutoApply;
+    QLabel* mLayerTitleLabel;
     QgsMapLayer* mCurrentLayer;
     QStackedWidget* mStackedWidget;
     QTabWidget *mMapStyleTabs;