Show a list of shortcut prefixes in locator bar if no text is entered

python/gui/locator/qgslocator.sip

@@ -71,9 +71,18 @@ class QgsLocator : QObject
     QList< QgsLocatorFilter *> filters();
 %Docstring
  Returns the list of filters registered in the locator.
+.. seealso:: prefixedFilters()
  :rtype: list of QgsLocatorFilter
 %End
 
+    QMap< QString, QgsLocatorFilter *> prefixedFilters() const;
+%Docstring
+ Returns a map of prefix to filter, for all registered filters
+ with valid prefixes.
+.. seealso:: filters()
+ :rtype: QMap< str, QgsLocatorFilter *>
+%End
+
     void fetchResults( const QString &string, const QgsLocatorContext &context, QgsFeedback *feedback = 0 );
 %Docstring
  Triggers the background fetching of filter results for a specified search ``string``.

src/app/locator/qgsinbuiltlocatorfilters.h

@@ -29,7 +29,7 @@ class QgsLayerTreeLocatorFilter : public QgsLocatorFilter
 
     QgsLayerTreeLocatorFilter( QObject *parent = nullptr );
     virtual QString name() const override { return QStringLiteral( "layertree" ); }
-    virtual QString displayName() const override { return tr( "Project layers" ); }
+    virtual QString displayName() const override { return tr( "Project Layers" ); }
     virtual Priority priority() const override { return Highest; }
     QString prefix() const override { return QStringLiteral( "l" ); }
 
@@ -46,7 +46,7 @@ class QgsLayoutLocatorFilter : public QgsLocatorFilter
 
     QgsLayoutLocatorFilter( QObject *parent = nullptr );
     virtual QString name() const override { return QStringLiteral( "layouts" ); }
-    virtual QString displayName() const override { return tr( "Project layouts" ); }
+    virtual QString displayName() const override { return tr( "Project Layouts" ); }
     virtual Priority priority() const override { return Highest; }
     QString prefix() const override { return QStringLiteral( "pl" ); }
 

src/gui/locator/qgslocator.cpp

@@ -48,6 +48,11 @@ QList<QgsLocatorFilter *> QgsLocator::filters()
   return mFilters;
 }
 
+QMap<QString, QgsLocatorFilter *> QgsLocator::prefixedFilters() const
+{
+  return mPrefixedFilters;
+}
+
 void QgsLocator::registerFilter( QgsLocatorFilter *filter )
 {
   mFilters.append( filter );

src/gui/locator/qgslocator.h

@@ -89,9 +89,17 @@ class GUI_EXPORT QgsLocator : public QObject
 
     /**
      * Returns the list of filters registered in the locator.
+     * \see prefixedFilters()
      */
     QList< QgsLocatorFilter *> filters();
 
+    /**
+     * Returns a map of prefix to filter, for all registered filters
+     * with valid prefixes.
+     * \see filters()
+     */
+    QMap< QString, QgsLocatorFilter *> prefixedFilters() const;
+
     /**
      * Triggers the background fetching of filter results for a specified search \a string.
      * The \a context argument encapsulates the context relating to the search (such as a map

src/gui/locator/qgslocatorwidget.cpp

@@ -83,6 +83,8 @@ QgsLocatorWidget::QgsLocatorWidget( QWidget *parent )
   mResultsView->installEventFilter( this );
   installEventFilter( this );
   window()->installEventFilter( this );
+
+  mLocator->registerFilter( new QgsLocatorFilterFilter( this, this ) );
 }
 
 QgsLocator *QgsLocatorWidget::locator()
@@ -204,7 +206,10 @@ void QgsLocatorWidget::addResult( const QgsLocatorResult &result )
   bool selectFirst = !mHasSelectedResult || mProxyModel->rowCount() == 0;
   mLocatorModel->addResult( result );
   if ( selectFirst )
-    mResultsView->setCurrentIndex( mProxyModel->index( 1, 0 ) );
+  {
+    int row = mProxyModel->flags( mProxyModel->index( 0, 0 ) ) & Qt::ItemIsSelectable ? 0 : 1;
+    mResultsView->setCurrentIndex( mProxyModel->index( row, 0 ) );
+  }
 }
 
 void QgsLocatorWidget::updateResults( const QString &text )
@@ -223,10 +228,7 @@ void QgsLocatorWidget::updateResults( const QString &text )
   {
     mHasSelectedResult = false;
     mLocatorModel->clear();
-    if ( !text.isEmpty() )
-    {
-      mLocator->fetchResults( text, createContext() );
-    }
+    mLocator->fetchResults( text, createContext() );
   }
 }
 
@@ -366,7 +368,7 @@ Qt::ItemFlags QgsLocatorModel::flags( const QModelIndex &index ) const
 void QgsLocatorModel::addResult( const QgsLocatorResult &result )
 {
   int pos = mResults.size();
-  bool addingFilter = !mFoundResultsFromFilterNames.contains( result.filter->name() );
+  bool addingFilter = !result.filter->displayName().isEmpty() && !mFoundResultsFromFilterNames.contains( result.filter->name() );
   if ( addingFilter )
     mFoundResultsFromFilterNames << result.filter->name();
 
@@ -469,3 +471,40 @@ bool QgsLocatorProxyModel::lessThan( const QModelIndex &left, const QModelIndex
   rightFilter = sourceModel()->data( right, Qt::DisplayRole ).toString();
   return QString::localeAwareCompare( leftFilter, rightFilter ) < 0;
 }
+
+QgsLocatorFilterFilter::QgsLocatorFilterFilter( QgsLocatorWidget *locator, QObject *parent )
+  : QgsLocatorFilter( parent )
+  , mLocator( locator )
+{}
+
+void QgsLocatorFilterFilter::fetchResults( const QString &string, const QgsLocatorContext &context, QgsFeedback *feedback )
+{
+  if ( !string.isEmpty() )
+  {
+    //only shows results when nothing typed
+    return;
+  }
+
+  QMap< QString, QgsLocatorFilter *> filters = mLocator->locator()->prefixedFilters();
+  QMap< QString, QgsLocatorFilter *>::const_iterator fIt = filters.constBegin();
+  for ( ; fIt != filters.constEnd(); ++fIt )
+  {
+    if ( feedback->isCanceled() )
+      return;
+
+    if ( fIt.value() == this || !fIt.value() )
+      continue;
+
+    QgsLocatorResult result;
+    result.filter = this;
+    result.displayString = QString( "%1 (%2)" ).arg( fIt.key(), fIt.value()->displayName() );
+    result.userData = fIt.key() + ' ';
+    //result.icon = action->icon();
+    emit resultFetched( result );
+  }
+}
+
+void QgsLocatorFilterFilter::triggerResult( const QgsLocatorResult &result )
+{
+  mLocator->search( result.userData.toString() );
+}

src/gui/locator/qgslocatorwidget.h

@@ -111,6 +111,23 @@ class GUI_EXPORT QgsLocatorWidget : public QWidget
 
 ///@cond PRIVATE
 
+class QgsLocatorFilterFilter : public QgsLocatorFilter
+{
+  public:
+
+    QgsLocatorFilterFilter( QgsLocatorWidget *widget, QObject *parent = nullptr );
+
+    virtual QString name() const override { return QStringLiteral( "filters" );}
+    virtual QString displayName() const override { return QString(); }
+    virtual Priority priority() const { return static_cast< QgsLocatorFilter::Priority>( -1 ); /** shh, we cheat!**/ }
+    virtual void fetchResults( const QString &string, const QgsLocatorContext &context, QgsFeedback *feedback ) override;
+    virtual void triggerResult( const QgsLocatorResult &result ) override;
+
+  private:
+
+    QgsLocatorWidget *mLocator = nullptr;
+};
+
 /**
  * \class QgsLocatorModel
  * \ingroup gui