Make color swatch list hi-dpi friendly

Author: nyalldawson

src/gui/qgscolorschemelist.cpp

@@ -704,9 +704,12 @@ void QgsColorSwatchDelegate::paint( QPainter *painter, const QStyleOptionViewIte
   }
 
   QRect rect = option.rect;
+  const int iconSize = Qgis::UI_SCALE_FACTOR * option.fontMetrics.width( 'X' ) * 4;
+  const int cornerSize = iconSize / 6;
   //center it
-  rect.setLeft( option.rect.center().x() - 15 );
-  rect.setSize( QSize( 30, 30 ) );
+  rect.setLeft( option.rect.center().x() - iconSize / 2 );
+
+  rect.setSize( QSize( iconSize, iconSize ) );
   rect.adjust( 0, 1, 0, 1 );
   //create an icon pixmap
   painter->save();
@@ -717,12 +720,12 @@ void QgsColorSwatchDelegate::paint( QPainter *painter, const QStyleOptionViewIte
     //start with checkboard pattern
     QBrush checkBrush = QBrush( transparentBackground() );
     painter->setBrush( checkBrush );
-    painter->drawRoundedRect( rect, 5, 5 );
+    painter->drawRoundedRect( rect, cornerSize, cornerSize );
   }
 
   //draw semi-transparent color on top
   painter->setBrush( color );
-  painter->drawRoundedRect( rect, 5, 5 );
+  painter->drawRoundedRect( rect, cornerSize, cornerSize );
   painter->restore();
 }
 
@@ -738,9 +741,10 @@ QPixmap QgsColorSwatchDelegate::transparentBackground() const
 
 QSize QgsColorSwatchDelegate::sizeHint( const QStyleOptionViewItem &option, const QModelIndex &index ) const
 {
-  Q_UNUSED( option );
   Q_UNUSED( index );
-  return QSize( 30, 32 );
+
+  const int iconSize = Qgis::UI_SCALE_FACTOR * option.fontMetrics.width( 'X' ) * 4;
+  return QSize( iconSize, iconSize * 32 / 30.0 );
 }
 
 bool QgsColorSwatchDelegate::editorEvent( QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index )

src/gui/qgscompoundcolorwidget.cpp

@@ -65,7 +65,7 @@ QgsCompoundColorWidget::QgsCompoundColorWidget( QWidget *parent, const QColor &c
   QgsSettings settings;
 
   mSchemeList->header()->hide();
-  mSchemeList->setColumnWidth( 0, 44 );
+  mSchemeList->setColumnWidth( 0, Qgis::UI_SCALE_FACTOR * fontMetrics().width( 'X' ) * 6 );
 
   //get schemes with ShowInColorDialog set
   refreshSchemeComboBox();

src/gui/raster/qgscolorrampshaderwidget.cpp

@@ -63,7 +63,7 @@ QgsColorRampShaderWidget::QgsColorRampShaderWidget( QWidget *parent )
 
   mSwatchDelegate = new QgsColorSwatchDelegate( this );
   mColormapTreeWidget->setItemDelegateForColumn( ColorColumn, mSwatchDelegate );
-  mColormapTreeWidget->setColumnWidth( ColorColumn, 50 );
+  mColormapTreeWidget->setColumnWidth( ColorColumn, Qgis::UI_SCALE_FACTOR * fontMetrics().width( 'X' ) * 6.6 );
   mColormapTreeWidget->setContextMenuPolicy( Qt::CustomContextMenu );
   mColormapTreeWidget->setSelectionMode( QAbstractItemView::ExtendedSelection );
   connect( mColormapTreeWidget, &QTreeView::customContextMenuRequested, this, [ = ]( QPoint ) { contextMenu->exec( QCursor::pos() ); }

src/gui/raster/qgspalettedrendererwidget.cpp

@@ -66,7 +66,7 @@ QgsPalettedRendererWidget::QgsPalettedRendererWidget( QgsRasterLayer *layer, con
 
   mSwatchDelegate = new QgsColorSwatchDelegate( this );
   mTreeView->setItemDelegateForColumn( QgsPalettedRendererModel::ColorColumn, mSwatchDelegate );
-  mTreeView->setColumnWidth( QgsPalettedRendererModel::ColorColumn, 50 );
+  mTreeView->setColumnWidth( QgsPalettedRendererModel::ColorColumn, Qgis::UI_SCALE_FACTOR * fontMetrics().width( 'X' ) * 6.6 );
   mTreeView->setContextMenuPolicy( Qt::CustomContextMenu );
   mTreeView->setSelectionMode( QAbstractItemView::ExtendedSelection );
   mTreeView->setDragEnabled( true );