Restore ability to save layouts to templates and add items from template

python/core/layout/qgslayout.sip

@@ -417,6 +417,28 @@ class QgsLayout : QGraphicsScene, QgsExpressionContextGenerator, QgsLayoutUndoOb
  :rtype: list of QgsLayoutMultiFrame
 %End
 
+    bool saveAsTemplate( const QString &path, const QgsReadWriteContext &context ) const;
+%Docstring
+ Saves the layout as a template at the given file ``path``.
+ Returns true if save was successful.
+.. seealso:: loadFromTemplate()
+ :rtype: bool
+%End
+
+    QList< QgsLayoutItem * > loadFromTemplate( const QDomDocument &document, const QgsReadWriteContext &context, bool clearExisting = true, bool *ok /Out/ = 0 );
+%Docstring
+ Load a layout template ``document``.
+
+ By default this method will clear all items from the existing layout and real all layout
+ settings from the template. Setting ``clearExisting`` to false will only add new items
+ from the template, without overwriting the existing items or layout settings.
+
+ If ``ok`` is specified, it will be set to true if the load was successful.
+
+ Returns a list of loaded items.
+ :rtype: list of QgsLayoutItem
+%End
+
     QDomElement writeXml( QDomDocument &document, const QgsReadWriteContext &context ) const;
 %Docstring
  Returns the layout's state encapsulated in a DOM element.

src/app/layout/qgslayoutdesignerdialog.cpp

@@ -44,6 +44,7 @@
 #include "qgslayoutmousehandles.h"
 #include "qgslayoutmodel.h"
 #include "qgslayoutitemslistview.h"
+#include "qgsproject.h"
 #include <QShortcut>
 #include <QComboBox>
 #include <QLineEdit>
@@ -52,6 +53,8 @@
 #include <QLabel>
 #include <QUndoView>
 #include <QTreeView>
+#include <QFileDialog>
+#include <QMessageBox>
 
 #ifdef ENABLE_MODELTEST
 #include "modeltest.h"
@@ -299,6 +302,9 @@ QgsLayoutDesignerDialog::QgsLayoutDesignerDialog( QWidget *parent, Qt::WindowFla
   mActionPreviewProtanope->setActionGroup( previewGroup );
   mActionPreviewDeuteranope->setActionGroup( previewGroup );
 
+  connect( mActionSaveAsTemplate, &QAction::triggered, this, &QgsLayoutDesignerDialog::saveAsTemplate );
+  connect( mActionLoadFromTemplate, &QAction::triggered, this, &QgsLayoutDesignerDialog::addItemsFromTemplate );
+
   connect( mActionZoomIn, &QAction::triggered, mView, &QgsLayoutView::zoomIn );
   connect( mActionZoomOut, &QAction::triggered, mView, &QgsLayoutView::zoomOut );
   connect( mActionZoomAll, &QAction::triggered, mView, &QgsLayoutView::zoomFull );
@@ -1130,6 +1136,84 @@ void QgsLayoutDesignerDialog::undoRedoOccurredForItems( const QSet<QString> item
     showItemOptions( focusItem );
 }
 
+void QgsLayoutDesignerDialog::saveAsTemplate()
+{
+  //show file dialog
+  QgsSettings settings;
+  QString lastSaveDir = settings.value( QStringLiteral( "UI/lastComposerTemplateDir" ), QDir::homePath() ).toString();
+#ifdef Q_OS_MAC
+  mQgis->activateWindow();
+  this->raise();
+#endif
+  QString saveFileName = QFileDialog::getSaveFileName(
+                           this,
+                           tr( "Save template" ),
+                           lastSaveDir,
+                           tr( "Layout templates" ) + " (*.qpt *.QPT)" );
+  if ( saveFileName.isEmpty() )
+    return;
+
+  QFileInfo saveFileInfo( saveFileName );
+  //check if suffix has been added
+  if ( saveFileInfo.suffix().isEmpty() )
+  {
+    QString saveFileNameWithSuffix = saveFileName.append( ".qpt" );
+    saveFileInfo = QFileInfo( saveFileNameWithSuffix );
+  }
+  settings.setValue( QStringLiteral( "UI/lastComposerTemplateDir" ), saveFileInfo.absolutePath() );
+
+  QgsReadWriteContext context;
+  context.setPathResolver( QgsProject::instance()->pathResolver() );
+  if ( !currentLayout()->saveAsTemplate( saveFileName, context ) )
+  {
+    QMessageBox::warning( nullptr, tr( "Save template" ), tr( "Error creating template file." ) );
+  }
+}
+
+void QgsLayoutDesignerDialog::addItemsFromTemplate()
+{
+  if ( !currentLayout() )
+    return;
+
+  QgsSettings settings;
+  QString openFileDir = settings.value( QStringLiteral( "UI/lastComposerTemplateDir" ), QDir::homePath() ).toString();
+  QString openFileString = QFileDialog::getOpenFileName( nullptr, tr( "Load template" ), openFileDir, tr( "Layout templates" ) + " (*.qpt *.QPT)" );
+
+  if ( openFileString.isEmpty() )
+  {
+    return; //canceled by the user
+  }
+
+  QFileInfo openFileInfo( openFileString );
+  settings.setValue( QStringLiteral( "UI/LastComposerTemplateDir" ), openFileInfo.absolutePath() );
+
+  QFile templateFile( openFileString );
+  if ( !templateFile.open( QIODevice::ReadOnly ) )
+  {
+    QMessageBox::warning( this, tr( "Load from template" ), tr( "Could not read template file." ) );
+    return;
+  }
+
+  QDomDocument templateDoc;
+  QgsReadWriteContext context;
+  context.setPathResolver( QgsProject::instance()->pathResolver() );
+  if ( templateDoc.setContent( &templateFile ) )
+  {
+    bool ok = false;
+    QList< QgsLayoutItem * > items = currentLayout()->loadFromTemplate( templateDoc, context, false, &ok );
+    if ( !ok )
+    {
+      QMessageBox::warning( this, tr( "Load from template" ), tr( "Could not read template file." ) );
+      return;
+    }
+    else
+    {
+      whileBlocking( currentLayout() )->deselectAll();
+      selectItems( items );
+    }
+  }
+}
+
 void QgsLayoutDesignerDialog::paste()
 {
   QPointF pt = mView->mapFromGlobal( QCursor::pos() );

src/app/layout/qgslayoutdesignerdialog.h

@@ -258,6 +258,8 @@ class QgsLayoutDesignerDialog: public QMainWindow, private Ui::QgsLayoutDesigner
     void statusMessageReceived( const QString &message );
     void dockVisibilityChanged( bool visible );
     void undoRedoOccurredForItems( const QSet< QString > itemUuids );
+    void saveAsTemplate();
+    void addItemsFromTemplate();
 
   private:
 

src/core/layout/qgslayout.cpp

@@ -470,6 +470,77 @@ QList<QgsLayoutMultiFrame *> QgsLayout::multiFrames() const
   return mMultiFrames;
 }
 
+bool QgsLayout::saveAsTemplate( const QString &path, const QgsReadWriteContext &context ) const
+{
+  QFile templateFile( path );
+  if ( !templateFile.open( QIODevice::WriteOnly | QIODevice::Truncate ) )
+  {
+    return false;
+  }
+
+  QDomDocument saveDocument;
+  QDomElement elem = writeXml( saveDocument, context );
+  saveDocument.appendChild( elem );
+
+  if ( templateFile.write( saveDocument.toByteArray() ) == -1 )
+    return false;
+
+  return true;
+}
+
+QList< QgsLayoutItem * > QgsLayout::loadFromTemplate( const QDomDocument &document, const QgsReadWriteContext &context, bool clearExisting, bool *ok )
+{
+  if ( ok )
+    *ok = false;
+
+  QList< QgsLayoutItem * > result;
+
+  if ( clearExisting )
+  {
+    clear();
+  }
+
+  QDomDocument doc = document;
+
+  // remove all uuid attributes since we don't want duplicates UUIDS
+  QDomNodeList composerItemsNodes = doc.elementsByTagName( QStringLiteral( "ComposerItem" ) );
+  for ( int i = 0; i < composerItemsNodes.count(); ++i )
+  {
+    QDomNode composerItemNode = composerItemsNodes.at( i );
+    if ( composerItemNode.isElement() )
+    {
+      composerItemNode.toElement().setAttribute( QStringLiteral( "templateUuid" ), composerItemNode.toElement().attribute( QStringLiteral( "uuid" ) ) );
+      composerItemNode.toElement().removeAttribute( QStringLiteral( "uuid" ) );
+    }
+  }
+
+  //read general settings
+  if ( clearExisting )
+  {
+    QDomElement layoutElem = doc.documentElement();
+    if ( layoutElem.isNull() )
+    {
+      return result;
+    }
+
+    bool loadOk = readXml( layoutElem, doc, context );
+    if ( !loadOk )
+    {
+      return result;
+    }
+    layoutItems( result );
+  }
+  else
+  {
+    result = addItemsFromXml( doc.documentElement(), doc, context );
+  }
+
+  if ( ok )
+    *ok = true;
+
+  return result;
+}
+
 QgsLayoutUndoStack *QgsLayout::undoStack()
 {
   return mUndoStack.get();

src/core/layout/qgslayout.h

@@ -465,6 +465,26 @@ class CORE_EXPORT QgsLayout : public QGraphicsScene, public QgsExpressionContext
      */
     QList< QgsLayoutMultiFrame * > multiFrames() const;
 
+    /**
+     * Saves the layout as a template at the given file \a path.
+     * Returns true if save was successful.
+     * \see loadFromTemplate()
+     */
+    bool saveAsTemplate( const QString &path, const QgsReadWriteContext &context ) const;
+
+    /**
+     * Load a layout template \a document.
+     *
+     * By default this method will clear all items from the existing layout and real all layout
+     * settings from the template. Setting \a clearExisting to false will only add new items
+     * from the template, without overwriting the existing items or layout settings.
+     *
+     * If \a ok is specified, it will be set to true if the load was successful.
+     *
+     * Returns a list of loaded items.
+     */
+    QList< QgsLayoutItem * > loadFromTemplate( const QDomDocument &document, const QgsReadWriteContext &context, bool clearExisting = true, bool *ok SIP_OUT = nullptr );
+
     /**
      * Returns the layout's state encapsulated in a DOM element.
      * \see readXml()

src/gui/layout/qgslayoutview.cpp

@@ -719,6 +719,9 @@ void QgsLayoutView::deleteSelectedItems()
 
 void QgsLayoutView::deleteItems( const QList<QgsLayoutItem *> &items )
 {
+  if ( items.empty() )
+    return;
+
   currentLayout()->undoStack()->beginMacro( tr( "Delete Items" ) );
   //delete selected items
   for ( QgsLayoutItem *item : items )

src/ui/layout/qgslayoutdesignerbase.ui

@@ -62,6 +62,8 @@
    <attribute name="toolBarBreak">
     <bool>false</bool>
    </attribute>
+   <addaction name="mActionLoadFromTemplate"/>
+   <addaction name="mActionSaveAsTemplate"/>
   </widget>
   <widget class="QToolBar" name="mToolsToolbar">
    <property name="windowTitle">
@@ -85,7 +87,7 @@
      <x>0</x>
      <y>0</y>
      <width>1083</width>
-     <height>42</height>
+     <height>25</height>
     </rect>
    </property>
    <widget class="QMenu" name="mLayoutMenu">
@@ -95,6 +97,9 @@
     <addaction name="mActionLayoutProperties"/>
     <addaction name="mActionAddPages"/>
     <addaction name="separator"/>
+    <addaction name="mActionLoadFromTemplate"/>
+    <addaction name="mActionSaveAsTemplate"/>
+    <addaction name="separator"/>
     <addaction name="mActionClose"/>
    </widget>
    <widget class="QMenu" name="mItemMenu">
@@ -1057,6 +1062,30 @@
     <string>Ctrl+Shift+V</string>
    </property>
   </action>
+  <action name="mActionSaveAsTemplate">
+   <property name="icon">
+    <iconset resource="../../../images/images.qrc">
+     <normaloff>:/images/themes/default/mActionFileSaveAs.svg</normaloff>:/images/themes/default/mActionFileSaveAs.svg</iconset>
+   </property>
+   <property name="text">
+    <string>Save as &amp;Template...</string>
+   </property>
+   <property name="toolTip">
+    <string>Save as template</string>
+   </property>
+  </action>
+  <action name="mActionLoadFromTemplate">
+   <property name="icon">
+    <iconset resource="../../../images/images.qrc">
+     <normaloff>:/images/themes/default/mActionFileOpen.svg</normaloff>:/images/themes/default/mActionFileOpen.svg</iconset>
+   </property>
+   <property name="text">
+    <string>&amp;Add Items from Template...</string>
+   </property>
+   <property name="toolTip">
+    <string>Add items from template</string>
+   </property>
+  </action>
  </widget>
  <resources>
   <include location="../../../images/images.qrc"/>
@@ -1086,6 +1115,7 @@
   <include location="../../../images/images.qrc"/>
   <include location="../../../images/images.qrc"/>
   <include location="../../../images/images.qrc"/>
+  <include location="../../../images/images.qrc"/>
  </resources>
  <connections/>
 </ui>