Add Help button and connect it to user manual

python/gui/symbology/qgssymbollevelsdialog.sip

@@ -8,7 +8,6 @@
 
 
 
-
 class QgsSymbolLevelsDialog : QDialog
 {
 

src/app/openstreetmap/qgsosmexportdialog.cpp

@@ -36,6 +36,7 @@ QgsOSMExportDialog::QgsOSMExportDialog( QWidget *parent )
   connect( btnBrowseDb, &QAbstractButton::clicked, this, &QgsOSMExportDialog::onBrowse );
   connect( buttonBox, &QDialogButtonBox::accepted, this, &QgsOSMExportDialog::onOK );
   connect( buttonBox, &QDialogButtonBox::rejected, this, &QgsOSMExportDialog::onClose );
+  connect( buttonBox, &QDialogButtonBox::helpRequested, this, &QgsOSMExportDialog::showHelp );
   connect( editDbFileName, &QLineEdit::textChanged, this, &QgsOSMExportDialog::updateLayerName );
   connect( radPoints, &QAbstractButton::clicked, this, &QgsOSMExportDialog::updateLayerName );
   connect( radPolylines, &QAbstractButton::clicked, this, &QgsOSMExportDialog::updateLayerName );
@@ -212,3 +213,8 @@ void QgsOSMExportDialog::onDeselectAll()
     mTagsModel->item( i, 0 )->setCheckState( Qt::Unchecked );
   }
 }
+
+void QgsOSMExportDialog::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "managing_data_source/opening_data.html#importing-openstreetmap-vectors" ) );
+}

src/app/openstreetmap/qgsosmexportdialog.h

@@ -19,6 +19,7 @@
 #include <QDialog>
 
 #include "ui_qgsosmexportdialog.h"
+#include "qgshelp.h"
 
 class QgsOSMDatabase;
 
@@ -43,6 +44,7 @@ class QgsOSMExportDialog : public QDialog, private Ui::QgsOSMExportDialog
 
     void onOK();
     void onClose();
+    void showHelp();
 
   private:
     QgsOSMDatabase *mDatabase = nullptr;

src/app/openstreetmap/qgsosmimportdialog.cpp

@@ -34,6 +34,7 @@ QgsOSMImportDialog::QgsOSMImportDialog( QWidget *parent )
   connect( editDbFileName, &QLineEdit::textChanged, this, &QgsOSMImportDialog::dbFileNameChanged );
   connect( buttonBox, &QDialogButtonBox::accepted, this, &QgsOSMImportDialog::onOK );
   connect( buttonBox, &QDialogButtonBox::rejected, this, &QgsOSMImportDialog::onClose );
+  connect( buttonBox, &QDialogButtonBox::helpRequested, this, &QgsOSMImportDialog::showHelp );
 
   connect( mImport, &QgsOSMXmlImport::progress, this, &QgsOSMImportDialog::onProgress );
 }
@@ -130,3 +131,8 @@ void QgsOSMImportDialog::onProgress( int percent )
   progressBar->setValue( percent );
   qApp->processEvents( QEventLoop::ExcludeSocketNotifiers );
 }
+
+void QgsOSMImportDialog::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "managing_data_source/opening_data.html#importing-openstreetmap-vectors" ) );
+}

src/app/openstreetmap/qgsosmimportdialog.h

@@ -19,6 +19,7 @@
 #include <QDialog>
 
 #include "ui_qgsosmimportdialog.h"
+#include "qgshelp.h"
 
 class QgsOSMXmlImport;
 
@@ -38,6 +39,7 @@ class QgsOSMImportDialog : public QDialog, private Ui::QgsOSMImportDialog
 
     void onOK();
     void onClose();
+    void showHelp();
 
     void onProgress( int percent );
 

src/app/qgsaddtaborgroup.cpp

@@ -51,6 +51,7 @@ QgsAddTabOrGroup::QgsAddTabOrGroup( QgsVectorLayer *lyr, const QList < TabPair >
 
   connect( mTabButton, &QAbstractButton::toggled, this, &QgsAddTabOrGroup::on_mTabButton_toggled );
   connect( mGroupButton, &QAbstractButton::toggled, this, &QgsAddTabOrGroup::on_mGroupButton_toggled );
+  connect( buttonBox, &QDialogButtonBox::helpRequested, this, &QgsAddTabOrGroup::showHelp );
 
   mColumnCountSpinBox->setValue( QgsSettings().value( QStringLiteral( "/qgis/attributeForm/defaultTabColumnCount" ), 1 ).toInt() );
 
@@ -115,3 +116,8 @@ void QgsAddTabOrGroup::on_mTabButton_toggled( bool checked )
   if ( checked )
     mColumnCountSpinBox->setValue( QgsSettings().value( QStringLiteral( "/qgis/attributeForm/defaultTabColumnCount" ), 1 ).toInt() );
 }
+
+void QgsAddTabOrGroup::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "working_with_vector/vector_properties.html#customize-a-form-for-your-data" ) );
+}

src/app/qgsaddtaborgroup.h

@@ -22,6 +22,7 @@
 #include "ui_qgsaddtaborgroupbase.h"
 #include "qgsguiutils.h"
 #include "qgis_app.h"
+#include "qgshelp.h"
 
 class QTreeWidgetItem;
 class QgsVectorLayer;
@@ -50,6 +51,7 @@ class APP_EXPORT QgsAddTabOrGroup : public QDialog, private Ui::QgsAddTabOrGroup
   private slots:
     void on_mGroupButton_toggled( bool checked );
     void on_mTabButton_toggled( bool checked );
+    void showHelp();
 
   protected:
     QgsVectorLayer *mLayer = nullptr;

src/app/qgsdiagramproperties.cpp

@@ -950,9 +950,15 @@ void QgsDiagramProperties::showSizeLegendDialog()
   dlg.setLayout( new QVBoxLayout() );
   dlg.setWindowTitle( panel->panelTitle() );
   dlg.layout()->addWidget( panel );
-  QDialogButtonBox *buttonBox = new QDialogButtonBox( QDialogButtonBox::Ok );
+  QDialogButtonBox *buttonBox = new QDialogButtonBox( QDialogButtonBox::Help | QDialogButtonBox::Ok );
   connect( buttonBox, &QDialogButtonBox::accepted, &dlg, &QDialog::accept );
+  connect( buttonBox, &QDialogButtonBox::helpRequested, this, &QgsDiagramProperties::showHelp );
   dlg.layout()->addWidget( buttonBox );
   if ( dlg.exec() )
     mSizeLegend.reset( panel->dataDefinedSizeLegend() );
 }
+
+void QgsDiagramProperties::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "working_with_vector/vector_properties.html#legend" ) );
+}

src/app/qgsdiagramproperties.h

@@ -90,6 +90,7 @@ class APP_EXPORT QgsDiagramProperties : public QWidget, private Ui::QgsDiagramPr
   private slots:
 
     void updateProperty();
+    void showHelp();
 };
 
 class EditBlockerDelegate: public QStyledItemDelegate

src/app/qgssavestyletodbdialog.cpp

@@ -34,6 +34,8 @@ QgsSaveStyleToDbDialog::QgsSaveStyleToDbDialog( QWidget *parent )
 
   QgsSettings settings;
   restoreGeometry( settings.value( QStringLiteral( "Windows/saveStyleToDb/geometry" ) ).toByteArray() );
+
+  connect( buttonBox, &QDialogButtonBox::helpRequested, this, &QgsSaveStyleToDbDialog::showHelp );
 }
 
 QgsSaveStyleToDbDialog::~QgsSaveStyleToDbDialog()
@@ -103,3 +105,8 @@ void QgsSaveStyleToDbDialog::on_mFilePickButton_clicked()
     mFileNameLabel->setText( myFI.fileName() );
   }
 }
+
+void QgsSaveStyleToDbDialog::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "introduction/general_tools.html#save-and-share-layer-properties" ) );
+}

src/app/qgssavestyletodbdialog.h

@@ -19,6 +19,7 @@
 #include "ui_qgssavetodbdialog.h"
 #include "qgsguiutils.h"
 #include "qgis_app.h"
+#include "qgshelp.h"
 
 class APP_EXPORT QgsSaveStyleToDbDialog : public QDialog, private Ui::QgsSaveToDBDialog
 {
@@ -38,6 +39,10 @@ class APP_EXPORT QgsSaveStyleToDbDialog : public QDialog, private Ui::QgsSaveToD
     bool isDefault();
     void on_mFilePickButton_clicked();
     void accept() override;
+
+  private slots:
+    void showHelp();
+
 };
 
 #endif // QGSSAVESTYLETODBDIALOG_H

src/gui/qgscolordialog.cpp

@@ -57,6 +57,7 @@ QgsColorDialog::QgsColorDialog( QWidget *parent, Qt::WindowFlags fl, const QColo
 
   connect( mColorWidget, &QgsCompoundColorWidget::currentColorChanged, this, &QgsColorDialog::currentColorChanged );
   connect( this, &QDialog::rejected, this, &QgsColorDialog::discardColor );
+  connect( mButtonBox, &QDialogButtonBox::helpRequested, this, &QgsColorDialog::showHelp );
 }
 
 QColor QgsColorDialog::color() const
@@ -205,3 +206,8 @@ void QgsColorDialog::closeEvent( QCloseEvent *e )
   saveSettings();
   QDialog::closeEvent( e );
 }
+
+void QgsColorDialog::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "introduction/general_tools.html#color-selector" ) );
+}

src/gui/qgscolordialog.h

@@ -21,6 +21,7 @@
 #include "ui_qgscolordialog.h"
 #include "qgis_gui.h"
 #include "qgis.h"
+#include "qgshelp.h"
 
 class QColor;
 
@@ -113,6 +114,7 @@ class GUI_EXPORT QgsColorDialog : public QDialog, private Ui::QgsColorDialogBase
     void on_mButtonBox_rejected();
     void on_mButtonBox_clicked( QAbstractButton *button );
     void discardColor();
+    void showHelp();
 
   private:
 

src/gui/qgsexpressionbuilderdialog.cpp

@@ -33,6 +33,8 @@ QgsExpressionBuilderDialog::QgsExpressionBuilderDialog( QgsVectorLayer *layer, c
 
   QgsSettings settings;
   restoreGeometry( settings.value( QStringLiteral( "Windows/ExpressionBuilderDialog/geometry" ) ).toByteArray() );
+
+  connect( buttonBox, &QDialogButtonBox::helpRequested, this, &QgsExpressionBuilderDialog::showHelp );
 }
 
 QgsExpressionBuilderWidget *QgsExpressionBuilderDialog::expressionBuilder()
@@ -79,3 +81,8 @@ void QgsExpressionBuilderDialog::setGeomCalculator( const QgsDistanceArea &da )
   // Store in child widget only.
   builder->setGeomCalculator( da );
 }
+
+void QgsExpressionBuilderDialog::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "working_with_vector/expression.html" ) );
+}

src/gui/qgsexpressionbuilderdialog.h

@@ -18,6 +18,7 @@
 
 #include <QDialog>
 #include "ui_qgsexpressionbuilderdialogbase.h"
+#include "qgshelp.h"
 #include "qgis_gui.h"
 
 
@@ -75,6 +76,10 @@ class GUI_EXPORT QgsExpressionBuilderDialog : public QDialog, private Ui::QgsExp
 
   private:
     QString mRecentKey;
+
+  private slots:
+    void showHelp();
+
 };
 
 #endif

src/gui/qgsexpressionselectiondialog.cpp

@@ -57,6 +57,8 @@ QgsExpressionSelectionDialog::QgsExpressionSelectionDialog( QgsVectorLayer *laye
 
   QgsSettings settings;
   restoreGeometry( settings.value( QStringLiteral( "Windows/ExpressionSelectionDialog/geometry" ) ).toByteArray() );
+
+  connect( buttonBox, &QDialogButtonBox::helpRequested, this, &QgsExpressionSelectionDialog::showHelp );
 }
 
 QgsExpressionBuilderWidget *QgsExpressionSelectionDialog::expressionBuilder()
@@ -194,3 +196,8 @@ void QgsExpressionSelectionDialog::saveRecent()
 {
   mExpressionBuilder->saveToRecent( QStringLiteral( "Selection" ) );
 }
+
+void QgsExpressionSelectionDialog::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "introduction/general_tools.html#automatic-selection" ) );
+}

src/gui/qgsexpressionselectiondialog.h

@@ -21,6 +21,7 @@
 
 #include "qgsmapcanvas.h"
 #include "qgsmessagebar.h"
+#include "qgshelp.h"
 
 #include <QDialog>
 #include "qgis_gui.h"
@@ -88,6 +89,7 @@ class GUI_EXPORT QgsExpressionSelectionDialog : public QDialog, private Ui::QgsE
     void on_mActionSelectIntersect_triggered();
     void on_mButtonZoomToFeatures_clicked();
     void on_mPbnClose_clicked();
+    void showHelp();
 
   protected:
 

src/gui/qgsgradientcolorrampdialog.cpp

@@ -146,6 +146,8 @@ QgsGradientColorRampDialog::QgsGradientColorRampDialog( const QgsGradientColorRa
 
   connect( mStopEditor, &QgsGradientStopEditor::selectedStopChanged, this, &QgsGradientColorRampDialog::selectedStopChanged );
   mStopEditor->selectStop( 0 );
+
+  connect( buttonBox, &QDialogButtonBox::helpRequested, this, &QgsGradientColorRampDialog::showHelp );
 }
 
 QgsGradientColorRampDialog::~QgsGradientColorRampDialog()
@@ -563,6 +565,11 @@ void QgsGradientColorRampDialog::setColor2( const QColor &color )
   updateColorButtons();
 }
 
+void QgsGradientColorRampDialog::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "working_with_vector/style_library.html#color-ramp" ) );
+}
+
 
 /// @cond PRIVATE
 

src/gui/qgsgradientcolorrampdialog.h

@@ -20,6 +20,7 @@
 #include "qgis.h"
 
 #include "ui_qgsgradientcolorrampdialogbase.h"
+#include "qgshelp.h"
 #include "qgis_gui.h"
 
 class QgsGradientColorRamp;
@@ -91,6 +92,7 @@ class GUI_EXPORT QgsGradientColorRampDialog : public QDialog, private Ui::QgsGra
     void plotMousePress( QPointF point );
     void plotMouseRelease( QPointF point );
     void plotMouseMove( QPointF point );
+    void showHelp();
 
   private:
 

src/gui/qgsnewmemorylayerdialog.cpp

@@ -56,6 +56,8 @@ QgsNewMemoryLayerDialog::QgsNewMemoryLayerDialog( QWidget *parent, Qt::WindowFla
 
   mPointRadioButton->setChecked( true );
   mNameLineEdit->setText( tr( "New scratch layer" ) );
+
+  connect( mButtonBox, &QDialogButtonBox::helpRequested, this, &QgsNewMemoryLayerDialog::showHelp );
 }
 
 QgsNewMemoryLayerDialog::~QgsNewMemoryLayerDialog()
@@ -116,3 +118,8 @@ QString QgsNewMemoryLayerDialog::layerName() const
 {
   return mNameLineEdit->text();
 }
+
+void QgsNewMemoryLayerDialog::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "managing_data_source/create_layers.html#creating-a-new-temporary-scratch-layer" ) );
+}

src/gui/qgsnewmemorylayerdialog.h

@@ -20,6 +20,7 @@
 #include "ui_qgsnewmemorylayerdialogbase.h"
 #include "qgsguiutils.h"
 #include "qgis.h"
+#include "qgshelp.h"
 #include "qgis_gui.h"
 
 class QgsVectorLayer;
@@ -65,6 +66,10 @@ class GUI_EXPORT QgsNewMemoryLayerDialog: public QDialog, private Ui::QgsNewMemo
   private:
 
     QString mCrsId;
+
+  private slots:
+
+    void showHelp();
 };
 
 #endif //QGSNEWMEMORYLAYERDIALOG_H

src/gui/qgsorderbydialog.cpp

@@ -34,6 +34,8 @@ QgsOrderByDialog::QgsOrderByDialog( QgsVectorLayer *layer, QWidget *parent )
   mOrderByTableWidget->horizontalHeader()->setResizeMode( 2, QHeaderView::ResizeToContents );
 
   mOrderByTableWidget->installEventFilter( this );
+
+  connect( buttonBox, &QDialogButtonBox::helpRequested, this, &QgsOrderByDialog::showHelp );
 }
 
 void QgsOrderByDialog::setOrderBy( const QgsFeatureRequest::OrderBy &orderBy )
@@ -150,3 +152,7 @@ bool QgsOrderByDialog::eventFilter( QObject *obj, QEvent *e )
   return false;
 }
 
+void QgsOrderByDialog::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "working_with_vector/vector_properties.html#layer-rendering" ) );
+}

src/gui/qgsorderbydialog.h

@@ -22,6 +22,7 @@
 
 #include "ui_qgsorderbydialogbase.h"
 #include "qgsfeaturerequest.h"
+#include "qgshelp.h"
 #include "qgis_gui.h"
 
 class QgsVectorLayer;
@@ -62,6 +63,7 @@ class GUI_EXPORT QgsOrderByDialog : public QDialog, private Ui::OrderByDialogBas
 
   private slots:
     void onExpressionChanged( const QString &expression );
+    void showHelp();
 
   private:
 

src/gui/qgsrasterlayersaveasdialog.cpp

@@ -137,6 +137,8 @@ QgsRasterLayerSaveAsDialog::QgsRasterLayerSaveAsDialog( QgsRasterLayer *rasterLa
     okButton->setEnabled( false );
   }
 
+  connect( mButtonBox, &QDialogButtonBox::helpRequested, this, &QgsRasterLayerSaveAsDialog::showHelp );
+
   mExtentGroupBox->setOutputCrs( outputCrs() );
   mExtentGroupBox->setOriginalExtent( mDataProvider->extent(), mLayerCrs );
   mExtentGroupBox->setCurrentExtent( mCurrentExtent, mCurrentCrs );
@@ -737,3 +739,7 @@ bool QgsRasterLayerSaveAsDialog::validate() const
   return true;
 }
 
+void QgsRasterLayerSaveAsDialog::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "managing_data_source/create_layers.html#save-layer-from-an-existing-file" ) );
+}

src/gui/qgsrasterlayersaveasdialog.h

@@ -20,6 +20,7 @@
 #include "qgscoordinatereferencesystem.h"
 #include "qgsrasterrange.h"
 #include "qgis_gui.h"
+#include "qgshelp.h"
 
 class QgsRasterLayer;
 class QgsRasterDataProvider;
@@ -108,6 +109,8 @@ class GUI_EXPORT QgsRasterLayerSaveAsDialog: public QDialog, private Ui::QgsRast
     void on_mPyramidsGroupBox_toggled( bool toggled );
     void populatePyramidsLevels();
     void extentChanged();
+    void crsChanged();
+    void showHelp();
 
   private:
     QgsRasterLayer *mRasterLayer = nullptr;
@@ -135,8 +138,6 @@ class GUI_EXPORT QgsRasterLayerSaveAsDialog: public QDialog, private Ui::QgsRast
     void adjustNoDataCellWidth( int row, int column );
     bool validate() const;
 
-  private slots:
-    void crsChanged();
 };
 
 

src/gui/symbology/qgsstyleexportimportdialog.cpp

@@ -113,6 +113,8 @@ QgsStyleExportImportDialog::QgsStyleExportImportDialog( QgsStyle *style, QWidget
   disconnect( buttonBox, &QDialogButtonBox::accepted, this, &QDialog::accept );
   connect( buttonBox, &QDialogButtonBox::accepted, this, &QgsStyleExportImportDialog::doExportImport );
   buttonBox->button( QDialogButtonBox::Ok )->setEnabled( false );
+
+  connect( buttonBox, &QDialogButtonBox::helpRequested, this, &QgsStyleExportImportDialog::showHelp );
 }
 
 void QgsStyleExportImportDialog::doExportImport()
@@ -585,3 +587,8 @@ void QgsStyleExportImportDialog::selectionChanged( const QItemSelection &selecte
   bool nothingSelected = listItems->selectionModel()->selectedIndexes().empty();
   buttonBox->button( QDialogButtonBox::Ok )->setDisabled( nothingSelected );
 }
+
+void QgsStyleExportImportDialog::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "working_with_vector/style_library.html#share-symbols" ) );
+}

src/gui/symbology/qgsstyleexportimportdialog.h

@@ -28,6 +28,7 @@
 #include "ui_qgsstyleexportimportdialogbase.h"
 #include "qgis_gui.h"
 #include "qgis_sip.h"
+#include "qgshelp.h"
 
 class QgsStyle;
 class QgsStyleGroupSelectionDialog;
@@ -114,6 +115,7 @@ class GUI_EXPORT QgsStyleExportImportDialog : public QDialog, private Ui::QgsSty
     void updateProgress( qint64, qint64 );
     void downloadCanceled();
     void selectionChanged( const QItemSelection &selected, const QItemSelection &deselected );
+    void showHelp();
 
   private:
     void downloadStyleXml( const QUrl &url );

src/gui/symbology/qgssymbollevelsdialog.cpp

@@ -43,6 +43,7 @@ QgsSymbolLevelsDialog::QgsSymbolLevelsDialog( const QgsLegendSymbolList &list, b
   chkEnable->setChecked( usingSymbolLevels );
 
   connect( chkEnable, &QAbstractButton::clicked, this, &QgsSymbolLevelsDialog::updateUi );
+  connect( buttonBox, &QDialogButtonBox::helpRequested, this, &QgsSymbolLevelsDialog::showHelp );
 
   // only consider entries with symbols
   Q_FOREACH ( const QgsLegendSymbolItem &item, list )
@@ -167,6 +168,11 @@ void QgsSymbolLevelsDialog::setForceOrderingEnabled( bool enabled )
     chkEnable->show();
 }
 
+void QgsSymbolLevelsDialog::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "working_with_vector/vector_properties.html#symbols-levels" ) );
+}
+
 
 /// @cond PRIVATE
 

src/gui/symbology/qgssymbollevelsdialog.h

@@ -21,7 +21,7 @@
 #include <QItemDelegate>
 
 #include "qgsrenderer.h"
-
+#include "qgshelp.h"
 #include "ui_qgssymbollevelsdialogbase.h"
 #include "qgis_gui.h"
 
@@ -47,6 +47,9 @@ class GUI_EXPORT QgsSymbolLevelsDialog : public QDialog, private Ui::QgsSymbolLe
 
     void renderingPassChanged( int row, int column );
 
+  private slots:
+    void showHelp();
+
   protected:
     //! \note not available in Python bindings
     void populateTable() SIP_SKIP;

src/gui/symbology/qgssymbolselectordialog.cpp

@@ -680,10 +680,11 @@ QgsSymbolSelectorDialog::QgsSymbolSelectorDialog( QgsSymbol *symbol, QgsStyle *s
 {
   setLayout( new QVBoxLayout() );
   mSelectorWidget = new QgsSymbolSelectorWidget( symbol, style, vl, this );
-  mButtonBox = new QDialogButtonBox( QDialogButtonBox::Ok | QDialogButtonBox::Cancel );
+  mButtonBox = new QDialogButtonBox( QDialogButtonBox::Cancel | QDialogButtonBox::Help | QDialogButtonBox::Ok );
 
   connect( mButtonBox, &QDialogButtonBox::accepted, this, &QDialog::accept );
   connect( mButtonBox, &QDialogButtonBox::rejected, this, &QDialog::reject );
+  connect( mButtonBox, &QDialogButtonBox::helpRequested, this, &QgsSymbolSelectorDialog::showHelp );
 
   layout()->addWidget( mSelectorWidget );
   layout()->addWidget( mButtonBox );
@@ -697,6 +698,10 @@ QgsSymbolSelectorDialog::QgsSymbolSelectorDialog( QgsSymbol *symbol, QgsStyle *s
     mButtonBox->hide();
     layout()->setContentsMargins( 0, 0, 0, 0 );
   }
+  else
+  {
+    setWindowTitle( tr( "Symbol Selector" ) );
+  }
   mSelectorWidget->setDockMode( embedded );
 }
 
@@ -833,3 +838,8 @@ void QgsSymbolSelectorDialog::changeLayer( QgsSymbolLayer *layer )
 {
   mSelectorWidget->changeLayer( layer );
 }
+
+void QgsSymbolSelectorDialog::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "working_with_vector/style_library.html#the-symbol-selector" ) );
+}

src/gui/symbology/qgssymbolselectordialog.h

@@ -25,6 +25,7 @@
 #include "qgspanelwidget.h"
 #include "qgssymbolwidgetcontext.h"
 #include "qgsproperty.h"
+#include "qgshelp.h"
 
 #include <QStandardItemModel>
 #include <QDialogButtonBox>
@@ -328,6 +329,9 @@ class GUI_EXPORT QgsSymbolSelectorDialog : public QDialog
     QgsSymbolSelectorWidget *mSelectorWidget = nullptr;
     QDialogButtonBox *mButtonBox = nullptr;
     QgsSymbolWidgetContext mContext;
+
+  private slots:
+    void showHelp();
 };
 
 #endif

src/plugins/geometry_checker/ui/qgsgeometrycheckerdialog.cpp

@@ -35,7 +35,7 @@ QgsGeometryCheckerDialog::QgsGeometryCheckerDialog( QgisInterface *iface, QWidge
   restoreGeometry( s.value( QStringLiteral( "/Plugin-GeometryChecker/Window/geometry" ) ).toByteArray() );
 
   mTabWidget = new QTabWidget();
-  mButtonBox = new QDialogButtonBox( QDialogButtonBox::Close, Qt::Horizontal );
+  mButtonBox = new QDialogButtonBox( QDialogButtonBox::Close | QDialogButtonBox::Help, Qt::Horizontal );
 
   QVBoxLayout *layout = new QVBoxLayout( this );
   layout->addWidget( mTabWidget );
@@ -46,6 +46,7 @@ QgsGeometryCheckerDialog::QgsGeometryCheckerDialog( QgisInterface *iface, QWidge
   mTabWidget->setTabEnabled( 1, false );
 
   connect( mButtonBox, &QDialogButtonBox::rejected, this, &QDialog::reject );
+  connect( mButtonBox, &QDialogButtonBox::helpRequested, this, &QgsGeometryCheckerDialog::showHelp );
   connect( dynamic_cast< QgsGeometryCheckerSetupTab * >( mTabWidget->widget( 0 ) ), &QgsGeometryCheckerSetupTab::checkerStarted, this, &QgsGeometryCheckerDialog::onCheckerStarted );
   connect( dynamic_cast< QgsGeometryCheckerSetupTab * >( mTabWidget->widget( 0 ) ), &QgsGeometryCheckerSetupTab::checkerFinished, this, &QgsGeometryCheckerDialog::onCheckerFinished );
 }
@@ -97,3 +98,8 @@ void QgsGeometryCheckerDialog::closeEvent( QCloseEvent *ev )
     QDialog::closeEvent( ev );
   }
 }
+
+void QgsGeometryCheckerDialog::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "plugins/plugins_geometry_checker.html" ) );
+}

src/plugins/geometry_checker/ui/qgsgeometrycheckerdialog.h

@@ -17,6 +17,8 @@
 #ifndef QGS_GEOMETRY_CHECKER_DIALOG_H
 #define QGS_GEOMETRY_CHECKER_DIALOG_H
 
+#include "qgshelp.h"
+
 #include <QDialog>
 #include <QDialogButtonBox>
 #include <QTabWidget>
@@ -44,6 +46,7 @@ class QgsGeometryCheckerDialog : public QDialog
   private slots:
     void onCheckerStarted( QgsGeometryChecker *checker, QgsFeaturePool *featurePool );
     void onCheckerFinished( bool successful );
+    void showHelp();
 };
 
 #endif // QGS_GEOMETRY_CHECKER_DIALOG_H

src/plugins/spatialquery/qgsspatialquerydialog.cpp

@@ -782,6 +782,9 @@ void QgsSpatialQueryDialog::on_bbMain_clicked( QAbstractButton *button )
     case QDialogButtonBox::RejectRole:
       reject();
       break;
+    case QDialogButtonBox::HelpRole:
+      showHelp();
+      break;
     default:
       return;
   }
@@ -1072,3 +1075,8 @@ void QgsSpatialQueryDialog::signal_layerReference_selectionFeaturesChanged()
 {
   evaluateCheckBoxLayer( false );
 } // void QgsSpatialQueryDialog::signal_layerReference_selectionFeaturesChanged()
+
+void QgsSpatialQueryDialog::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "plugins/plugins_spatial_query.html" ) );
+}

src/plugins/spatialquery/qgsspatialquerydialog.h

@@ -24,6 +24,7 @@
 #include "ui_qgsspatialquerydialogbase.h"
 #include "qgisinterface.h"
 #include "qgsvectorlayer.h"
+#include "qgshelp.h"
 
 /**
 * \class QgsSpatialQueryDialog
@@ -61,6 +62,7 @@ class QgsSpatialQueryDialog : public QDialog, private Ui::QgsSpatialQueryDialogB
     void on_ckbUsingSelectedTarget_toggled();
     void on_ckbLogProcessing_clicked( bool checked );
     void on_ckbZoomItem_clicked( bool checked );
+    void showHelp();
 
     //! Slots for signs of QGIS
     void signal_qgis_layerWasAdded( QgsMapLayer *mapLayer );

src/plugins/spatialquery/qgsspatialquerydialogbase.ui

@@ -404,7 +404,7 @@ p, li { white-space: pre-wrap; }
       <string>Run query or close the window</string>
      </property>
      <property name="standardButtons">
-      <set>QDialogButtonBox::Apply|QDialogButtonBox::Close</set>
+      <set>QDialogButtonBox::Apply|QDialogButtonBox::Close|QDialogButtonBox::Help</set>
      </property>
     </widget>
    </item>

src/providers/wcs/qgswcssourceselect.cpp

@@ -40,6 +40,8 @@ QgsWCSSourceSelect::QgsWCSSourceSelect( QWidget *parent, Qt::WindowFlags fl, Qgs
   mAddDefaultButton->hide();
 
   mLayersTreeWidget->setSelectionMode( QAbstractItemView::SingleSelection );
+
+  connect( buttonBox, &QDialogButtonBox::helpRequested, this, &QgsWCSSourceSelect::showHelp );
 }
 
 QgsWCSSourceSelect::~QgsWCSSourceSelect()
@@ -255,3 +257,9 @@ void QgsWCSSourceSelect::enableLayersForCrs( QTreeWidgetItem * )
 {
   // TODO: I am not convinced to disable layers according to selected CRS
 }
+
+
+void QgsWCSSourceSelect::showHelp()
+{
+  QgsHelp::openHelp( QStringLiteral( "working_with_ogc/ogc_client_support.html" ) );
+}

src/providers/wcs/qgswcssourceselect.h

@@ -23,6 +23,8 @@
 #include "qgsowssourceselect.h"
 #include "qgsdatasourceuri.h"
 #include "qgsguiutils.h"
+#include "qgshelp.h"
+
 #include "qgswcscapabilities.h"
 #include "qgsproviderregistry.h"
 #include "qgsdataprovider.h"
@@ -78,6 +80,11 @@ class QgsWCSSourceSelect : public QgsOWSSourceSelect
     QStringList selectedLayersFormats() override;
     QStringList selectedLayersCrses() override;
     QStringList selectedLayersTimes() override;
+
+  private slots:
+
+    //! Open help browser
+    void showHelp();
 };
 #endif // QGSWCSSOURCESELECT_H
 

src/ui/qgsaddtaborgroupbase.ui

@@ -81,16 +81,6 @@
      </property>
     </spacer>
    </item>
-   <item row="4" column="1">
-    <widget class="QDialogButtonBox" name="buttonBox">
-     <property name="orientation">
-      <enum>Qt::Horizontal</enum>
-     </property>
-     <property name="standardButtons">
-      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
-     </property>
-    </widget>
-   </item>
    <item row="1" column="0">
     <widget class="QLabel" name="label_3">
      <property name="text">
@@ -108,6 +98,16 @@
      </property>
     </widget>
    </item>
+   <item row="4" column="0" colspan="2">
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Help|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
   </layout>
  </widget>
  <tabstops>

src/ui/qgscolordialog.ui

@@ -26,7 +26,7 @@
       <enum>Qt::Horizontal</enum>
      </property>
      <property name="standardButtons">
-      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Help|QDialogButtonBox::Ok</set>
      </property>
     </widget>
    </item>
@@ -89,14 +89,13 @@
   </action>
  </widget>
  <customwidgets>
- <customwidget>
-  <class>QgsCompoundColorWidget</class>
-  <extends>QWidget</extends>
-  <header>qgscompoundcolorwidget.h</header>
-  <container>1</container>
- </customwidget>
-</customwidgets>
-
+  <customwidget>
+   <class>QgsCompoundColorWidget</class>
+   <extends>QWidget</extends>
+   <header>qgscompoundcolorwidget.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
  <resources/>
  <connections/>
 </ui>

src/ui/qgsexpressionbuilderdialogbase.ui

@@ -33,7 +33,7 @@
       <enum>Qt::Horizontal</enum>
      </property>
      <property name="standardButtons">
-      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Help|QDialogButtonBox::Ok</set>
      </property>
     </widget>
    </item>

src/ui/qgsexpressionselectiondialogbase.ui

@@ -14,9 +14,32 @@
    <string>Select By Expression</string>
   </property>
   <layout class="QGridLayout" name="gridLayout">
-   <property name="margin">
+   <property name="leftMargin">
     <number>3</number>
    </property>
+   <property name="topMargin">
+    <number>3</number>
+   </property>
+   <property name="rightMargin">
+    <number>3</number>
+   </property>
+   <property name="bottomMargin">
+    <number>3</number>
+   </property>
+   <item row="1" column="4">
+    <widget class="QPushButton" name="mPbnClose">
+     <property name="text">
+      <string>Close</string>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="1">
+    <widget class="QToolButton" name="mButtonZoomToFeatures">
+     <property name="text">
+      <string>Zoom to features</string>
+     </property>
+    </widget>
+   </item>
    <item row="1" column="0">
     <spacer name="horizontalSpacer">
      <property name="orientation">
@@ -30,12 +53,8 @@
      </property>
     </spacer>
    </item>
-   <item row="1" column="3">
-    <widget class="QPushButton" name="mPbnClose">
-     <property name="text">
-      <string>Close</string>
-     </property>
-    </widget>
+   <item row="0" column="0" colspan="5">
+    <widget class="QgsExpressionBuilderWidget" name="mExpressionBuilder" native="true"/>
    </item>
    <item row="1" column="2">
     <widget class="QToolButton" name="mButtonSelect">
@@ -50,16 +69,13 @@
      </property>
     </widget>
    </item>
-   <item row="1" column="1">
-    <widget class="QToolButton" name="mButtonZoomToFeatures">
-     <property name="text">
-      <string>Zoom to features</string>
+   <item row="1" column="3">
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Close|QDialogButtonBox::Help</set>
      </property>
     </widget>
    </item>
-   <item row="0" column="0" colspan="4">
-    <widget class="QgsExpressionBuilderWidget" name="mExpressionBuilder" native="true"/>
-   </item>
   </layout>
   <action name="mActionSelect">
    <property name="text">

src/ui/qgsgradientcolorrampdialogbase.ui

@@ -321,7 +321,7 @@
         <enum>Qt::Horizontal</enum>
        </property>
        <property name="standardButtons">
-        <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+        <set>QDialogButtonBox::Cancel|QDialogButtonBox::Help|QDialogButtonBox::Ok</set>
        </property>
       </widget>
      </item>

src/ui/qgsnewmemorylayerdialogbase.ui

@@ -141,7 +141,7 @@
       <enum>Qt::Horizontal</enum>
      </property>
      <property name="standardButtons">
-      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Help|QDialogButtonBox::Ok</set>
      </property>
     </widget>
    </item>

src/ui/qgsorderbydialogbase.ui

@@ -20,7 +20,7 @@
       <enum>Qt::Horizontal</enum>
      </property>
      <property name="standardButtons">
-      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Help|QDialogButtonBox::Ok</set>
      </property>
     </widget>
    </item>

src/ui/qgsosmexportdialog.ui

@@ -157,7 +157,7 @@
         <enum>Qt::Horizontal</enum>
        </property>
        <property name="standardButtons">
-        <set>QDialogButtonBox::Close|QDialogButtonBox::Ok</set>
+        <set>QDialogButtonBox::Close|QDialogButtonBox::Help|QDialogButtonBox::Ok</set>
        </property>
       </widget>
      </item>

src/ui/qgsosmimportdialog.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>396</width>
-    <height>257</height>
+    <height>260</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -102,7 +102,7 @@
         <enum>Qt::Horizontal</enum>
        </property>
        <property name="standardButtons">
-        <set>QDialogButtonBox::Close|QDialogButtonBox::Ok</set>
+        <set>QDialogButtonBox::Close|QDialogButtonBox::Help|QDialogButtonBox::Ok</set>
        </property>
       </widget>
      </item>

src/ui/qgsrasterlayersaveasdialogbase.ui

@@ -674,7 +674,7 @@ datasets with maximum width and height specified below.</string>
       <enum>Qt::Horizontal</enum>
      </property>
      <property name="standardButtons">
-      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Help|QDialogButtonBox::Ok</set>
      </property>
     </widget>
    </item>

src/ui/qgssavetodbdialog.ui

@@ -50,16 +50,6 @@
    <item row="0" column="1">
     <widget class="QLineEdit" name="mNameEdit"/>
    </item>
-   <item row="6" column="1">
-    <widget class="QDialogButtonBox" name="buttonBox">
-     <property name="standardButtons">
-      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
-     </property>
-     <property name="centerButtons">
-      <bool>false</bool>
-     </property>
-    </widget>
-   </item>
    <item row="5" column="1">
     <widget class="QCheckBox" name="mUseAsDefault">
      <property name="text">
@@ -107,6 +97,16 @@
      </property>
     </widget>
    </item>
+   <item row="6" column="0" colspan="2">
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Help|QDialogButtonBox::Ok</set>
+     </property>
+     <property name="centerButtons">
+      <bool>false</bool>
+     </property>
+    </widget>
+   </item>
   </layout>
  </widget>
  <layoutdefault spacing="6" margin="11"/>

src/ui/qgsstyleexportimportdialogbase.ui

@@ -6,7 +6,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>400</width>
+    <width>413</width>
     <height>379</height>
    </rect>
   </property>
@@ -144,7 +144,7 @@
       <enum>Qt::Horizontal</enum>
      </property>
      <property name="standardButtons">
-      <set>QDialogButtonBox::Close|QDialogButtonBox::Ok</set>
+      <set>QDialogButtonBox::Close|QDialogButtonBox::Help|QDialogButtonBox::Ok</set>
      </property>
     </widget>
    </item>

src/ui/qgssymbollevelsdialogbase.ui

@@ -47,7 +47,7 @@
       <enum>Qt::Horizontal</enum>
      </property>
      <property name="standardButtons">
-      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Help|QDialogButtonBox::Ok</set>
      </property>
     </widget>
    </item>