Hide new composer when duplicating (loading template) as it is faster

- Show busy indicator dialog
- Add busy indicator dialog method to QgsComposer

Author: dakcarto

src/app/composer/qgscomposer.cpp

@@ -56,10 +56,12 @@
 #include <QCloseEvent>
 #include <QCheckBox>
 #include <QDesktopWidget>
+#include <QDialog>
 #include <QFileDialog>
 #include <QFileInfo>
 #include <QIcon>
 #include <QImageWriter>
+#include <QLabel>
 #include <QMatrix>
 #include <QMenuBar>
 #include <QMessageBox>
@@ -75,6 +77,7 @@
 #include <QToolButton>
 #include <QUndoView>
 #include <QPaintEngine>
+#include <QProgressBar>
 #include <QProgressDialog>
 
 
@@ -489,6 +492,24 @@ void QgsComposer::setTitle( const QString& title )
   }
 }
 
+QDialog* QgsComposer::progressDialog( const QString& message, QWidget* parent )
+{
+  QDialog* dlg = new QDialog( parent );
+  dlg->setLayout( new QVBoxLayout() );
+  dlg->setWindowModality( Qt::WindowModal );
+  dlg->setAttribute( Qt::WA_DeleteOnClose );
+  dlg->setMinimumWidth( 250 );
+  if ( !message.isEmpty() )
+  {
+    dlg->layout()->addWidget( new QLabel( message ) );
+  }
+  QProgressBar* pb = new QProgressBar();
+  pb->setMaximum( 0 ); // show as busy indicator
+  dlg->layout()->addWidget( pb );
+
+  return dlg;
+}
+
 void QgsComposer::showItemOptions( QgsComposerItem* item )
 {
   QWidget* currentWidget = mItemDock->widget();
@@ -1352,7 +1373,19 @@ void QgsComposer::on_mActionDuplicateComposer_triggered()
   {
     return;
   }
-  mQgis->duplicateComposer( this, newTitle );
+
+  // provide feedback, since loading of template into duplicate composer will be hidden
+  QDialog* dlg = progressDialog( tr( "Duplicating composer..." ), this );
+  dlg->show();
+
+  QgsComposer* newComposer = mQgis->duplicateComposer( this, newTitle );
+  dlg->close();
+
+  if ( !newComposer )
+  {
+    QMessageBox::warning( this, tr( "Duplicate Composer" ),
+                          tr( "Composer duplication failed." ) );
+  }
 }
 
 void QgsComposer::on_mActionComposerManager_triggered()

src/app/composer/qgscomposer.h

@@ -84,6 +84,11 @@ class QgsComposer: public QMainWindow, private Ui::QgsComposerBase
     const QString& title() const {return mTitle;}
     void setTitle( const QString& title );
 
+    //! Modal busy indicator dialog with no buttons that deletes on close
+    //! @param message text to show above busy progress indicator
+    //! @note added in 1.9
+    QDialog* progressDialog( const QString& message = QString( "" ), QWidget* parent = 0 );
+
   protected:
     //! Move event
     virtual void moveEvent( QMoveEvent * );

src/app/composer/qgscomposermanager.cpp

@@ -19,6 +19,8 @@
 #include "qgsapplication.h"
 #include "qgscomposer.h"
 #include "qgslogger.h"
+
+#include <QDialog>
 #include <QDir>
 #include <QInputDialog>
 #include <QListWidgetItem>
@@ -250,13 +252,23 @@ void QgsComposerManager::duplicate_clicked()
     return;
   }
 
+  // provide feedback, since loading of template into duplicate composer will be hidden
+  QDialog* dlg = currentComposer->progressDialog( tr( "Duplicating composer..." ), this );
+  dlg->show();
+
   QgsComposer* newComposer = QgisApp::instance()->duplicateComposer( currentComposer, newTitle );
+  dlg->close();
 
   if ( newComposer )
   {
     // no need to add new composer to list widget, if just closing this->exec();
     close();
   }
+  else
+  {
+    QMessageBox::warning( this, tr( "Duplicate Composer" ),
+                          tr( "Composer duplication failed." ) );
+  }
 }
 
 void QgsComposerManager::rename_clicked()

src/app/qgisapp.cpp

@@ -4731,9 +4731,8 @@ QgsComposer* QgisApp::duplicateComposer( QgsComposer* currentComposer, QString t
     return newComposer;
   }
 
-  // disable updates until template is loaded (may be faster, but still gives user feedback),
-  // but is not as fast as hiding composer until template is loaded
-  newComposer->setUpdatesEnabled( false );
+  // hiding composer until template is loaded is much faster, provide feedback to user
+  newComposer->hide();
   QApplication::setOverrideCursor( Qt::BusyCursor );
   if ( !newComposer->composition()->loadFromTemplate( currentDoc, 0, false ) )
   {
@@ -4742,7 +4741,6 @@ QgsComposer* QgisApp::duplicateComposer( QgsComposer* currentComposer, QString t
     QgsDebugMsg( "Error, composer could not be duplicated" );
     return newComposer;
   }
-  newComposer->setUpdatesEnabled( true );
   newComposer->activate();
   QApplication::restoreOverrideCursor();