Use title from template as default in layout manager

use the template name (if empty or not) as default value in the dialog. user can edit it.
if it is already existing, the user has to change it.

Author: signedav

src/app/composer/qgscomposermanager.cpp

@@ -192,6 +192,10 @@ void QgsComposerManager::mAddButton_clicked()
 {
   QFile templateFile;
   bool loadingTemplate = ( mTemplate->currentIndex() > 0 );
+  QDomDocument templateDoc;
+
+  QString currentTitle;
+
   if ( loadingTemplate )
   {
     if ( mTemplate->currentIndex() == 1 )
@@ -213,13 +217,20 @@ void QgsComposerManager::mAddButton_clicked()
       QMessageBox::warning( this, tr( "Template error" ), tr( "Error, could not read file" ) );
       return;
     }
+
+    if ( templateDoc.setContent( &templateFile, false ) )
+    {
+      QDomElement compositionElem = templateDoc.documentElement().firstChildElement( QStringLiteral( "Composition" ) );
+      if ( !compositionElem.isNull() )
+        currentTitle = compositionElem.attribute( "name" );
+    }
   }
 
   QgsComposer *newComposer = nullptr;
   bool loadedOK = false;
 
   QString title;
-  if ( !QgisApp::instance()->uniqueComposerTitle( this, title, true ) )
+  if ( !QgisApp::instance()->uniqueComposerTitle( this, title, true, currentTitle ) )
   {
     return;
   }
@@ -237,7 +248,6 @@ void QgsComposerManager::mAddButton_clicked()
 
   if ( loadingTemplate )
   {
-    QDomDocument templateDoc;
     if ( templateDoc.setContent( &templateFile, false ) )
     {
       loadedOK = newComposer->loadFromTemplate( templateDoc, true );

src/app/layout/qgslayoutmanagerdialog.cpp

@@ -201,6 +201,8 @@ void QgsLayoutManagerDialog::mAddButton_clicked()
 {
   QFile templateFile;
   bool loadingTemplate = ( mTemplate->currentIndex() > 0 );
+  QDomDocument templateDoc;
+  QString storedTitle;
   if ( loadingTemplate )
   {
     if ( mTemplate->currentIndex() == 1 )
@@ -222,10 +224,18 @@ void QgsLayoutManagerDialog::mAddButton_clicked()
       QMessageBox::warning( this, tr( "Create layout" ), tr( "Could not read template file “%1”." ).arg( templateFile.fileName() ) );
       return;
     }
+
+
+    if ( templateDoc.setContent( &templateFile, false ) )
+    {
+      QDomElement layoutElem = templateDoc.documentElement();
+      if ( !layoutElem.isNull() )
+        storedTitle = layoutElem.attribute( "name" );
+    }
   }
 
   QString title;
-  if ( !QgisApp::instance()->uniqueLayoutTitle( this, title, true ) )
+  if ( !QgisApp::instance()->uniqueLayoutTitle( this, title, true, storedTitle ) )
   {
     return;
   }
@@ -238,16 +248,12 @@ void QgsLayoutManagerDialog::mAddButton_clicked()
   std::unique_ptr< QgsLayout > layout = qgis::make_unique< QgsLayout >( QgsProject::instance() );
   if ( loadingTemplate )
   {
-    QDomDocument templateDoc;
-    if ( templateDoc.setContent( &templateFile, false ) )
+    bool loadedOK = false;
+    ( void )layout->loadFromTemplate( templateDoc, QgsReadWriteContext(), true, &loadedOK );
+    if ( !loadedOK )
     {
-      bool loadedOK = false;
-      ( void )layout->loadFromTemplate( templateDoc, QgsReadWriteContext(), true, &loadedOK );
-      if ( !loadedOK )
-      {
-        QMessageBox::warning( this, tr( "Create layout" ), tr( "Invalid template file “%1”." ).arg( templateFile.fileName() ) );
-        layout.reset();
-      }
+      QMessageBox::warning( this, tr( "Create layout" ), tr( "Invalid template file “%1”." ).arg( templateFile.fileName() ) );
+      layout.reset();
     }
   }
   else