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akonadi

dragdropmanager.cpp

00001 /*
00002     Copyright (c) 2009 Stephen Kelly <steveire@gmail.com>
00003 
00004     This library is free software; you can redistribute it and/or modify it
00005     under the terms of the GNU Library General Public License as published by
00006     the Free Software Foundation; either version 2 of the License, or (at your
00007     option) any later version.
00008 
00009     This library is distributed in the hope that it will be useful, but WITHOUT
00010     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00011     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
00012     License for more details.
00013 
00014     You should have received a copy of the GNU Library General Public License
00015     along with this library; see the file COPYING.LIB.  If not, write to the
00016     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
00017     02110-1301, USA.
00018 */
00019 
00020 #include "dragdropmanager_p.h"
00021 #include "specialcollectionattribute_p.h"
00022 
00023 #include <QtGui/QApplication>
00024 #include <QtGui/QDropEvent>
00025 #include <QtGui/QMenu>
00026 
00027 #include <KDE/KIcon>
00028 #include <KDE/KLocale>
00029 #include <KDE/KUrl>
00030 
00031 #include "akonadi/collection.h"
00032 #include "akonadi/entitytreemodel.h"
00033 
00034 using namespace Akonadi;
00035 
00036 DragDropManager::DragDropManager( QAbstractItemView *view )
00037     : mShowDropActionMenu( true ), m_view( view )
00038 {
00039 }
00040 
00041 Collection DragDropManager::currentDropTarget( QDropEvent *event ) const
00042 {
00043   const QModelIndex index = m_view->indexAt( event->pos() );
00044 
00045   Collection collection = m_view->model()->data( index, EntityTreeModel::CollectionRole ).value<Collection>();
00046   if ( !collection.isValid() ) {
00047     const Item item = m_view->model()->data( index, EntityTreeModel::ItemRole ).value<Item>();
00048     if ( item.isValid() )
00049       collection = m_view->model()->data( index.parent(), EntityTreeModel::CollectionRole ).value<Collection>();
00050   }
00051 
00052   return collection;
00053 }
00054 
00055 bool DragDropManager::dropAllowed( QDragMoveEvent *event ) const
00056 {
00057   // Check if the collection under the cursor accepts this data type
00058   const Collection targetCollection = currentDropTarget( event );
00059   if ( targetCollection.isValid() ) {
00060     const QStringList supportedContentTypes = targetCollection.contentMimeTypes();
00061 
00062     const QMimeData *data = event->mimeData();
00063     const KUrl::List urls = KUrl::List::fromMimeData( data );
00064     foreach ( const KUrl &url, urls ) {
00065       const Collection collection = Collection::fromUrl( url );
00066       if ( collection.isValid() ) {
00067         if ( !supportedContentTypes.contains( Collection::mimeType() ) )
00068           break;
00069 
00070         // Check if we don't try to drop on one of the children
00071         if ( hasAncestor( m_view->indexAt( event->pos() ), collection.id() ) )
00072           break;
00073       } else { // This is an item.
00074         const QString type = url.queryItems()[ QString::fromLatin1( "type" ) ];
00075         if ( !supportedContentTypes.contains( type ) )
00076           break;
00077       }
00078 
00079       return true;
00080     }
00081   }
00082 
00083   return false;
00084 }
00085 
00086 bool DragDropManager::hasAncestor( const QModelIndex &_index, Collection::Id parentId ) const
00087 {
00088   QModelIndex index( _index );
00089   while ( index.isValid() ) {
00090     if ( m_view->model()->data( index, EntityTreeModel::CollectionIdRole ).toLongLong() == parentId )
00091       return true;
00092 
00093     index = index.parent();
00094   }
00095 
00096   return false;
00097 }
00098 
00099 bool DragDropManager::processDropEvent( QDropEvent *event )
00100 {
00101   const Collection targetCollection = currentDropTarget( event );
00102   if ( !targetCollection.isValid() )
00103     return false;
00104 
00105   int actionCount = 0;
00106   Qt::DropAction defaultAction;
00107   // TODO check if the source supports moving
00108 
00109   bool moveAllowed, copyAllowed, linkAllowed;
00110   moveAllowed = copyAllowed = linkAllowed = false;
00111 
00112   if ( (targetCollection.rights() & (Collection::CanCreateCollection | Collection::CanCreateItem))
00113        && (event->possibleActions() & Qt::MoveAction) ) {
00114     moveAllowed = true;
00115   }
00116   if ( (targetCollection.rights() & (Collection::CanCreateCollection | Collection::CanCreateItem))
00117         && (event->possibleActions() & Qt::CopyAction) ) {
00118     copyAllowed = true;
00119   }
00120 
00121   if ( (targetCollection.rights() & Collection::CanLinkItem) && (event->possibleActions() & Qt::LinkAction) ) {
00122     linkAllowed = true;
00123   }
00124 
00125   if ( !moveAllowed && !copyAllowed && !linkAllowed ) {
00126     kDebug() << "Cannot drop here:" << event->possibleActions() << m_view->model()->supportedDragActions() << m_view->model()->supportedDropActions();
00127     return false;
00128   }
00129 
00130   // first check whether the user pressed a modifier key to select a specific action
00131   if ( (QApplication::keyboardModifiers() & Qt::ControlModifier) &&
00132        (QApplication::keyboardModifiers() & Qt::ShiftModifier) ) {
00133     if ( linkAllowed ) {
00134       defaultAction = Qt::LinkAction;
00135       actionCount = 1;
00136     } else
00137       return false;
00138   } else if ( (QApplication::keyboardModifiers() & Qt::ControlModifier) ) {
00139     if ( copyAllowed ) {
00140       defaultAction = Qt::CopyAction;
00141       actionCount = 1;
00142     } else
00143       return false;
00144   } else if ( (QApplication::keyboardModifiers() & Qt::ShiftModifier) ) {
00145     if ( moveAllowed ) {
00146       defaultAction = Qt::MoveAction;
00147       actionCount = 1;
00148     } else
00149       return false;
00150   }
00151 
00152   if ( actionCount == 1 ) {
00153     kDebug() << "Selecting drop action" << defaultAction << ", there are no other possibilities";
00154     event->setDropAction( defaultAction );
00155     return true;
00156   }
00157 
00158   if ( !mShowDropActionMenu ) {
00159     if ( moveAllowed )
00160       defaultAction = Qt::MoveAction;
00161     else if ( copyAllowed )
00162       defaultAction = Qt::CopyAction;
00163     else if ( linkAllowed )
00164       defaultAction = Qt::LinkAction;
00165     else
00166       return false;
00167     event->setDropAction( defaultAction );
00168     return true;
00169   }
00170 
00171   // otherwise show up a menu to allow the user to select an action
00172   QMenu popup( m_view );
00173   QAction* moveDropAction = 0;
00174   QAction* copyDropAction = 0;
00175   QAction* linkAction = 0;
00176   QString sequence;
00177 
00178   if ( moveAllowed ) {
00179     sequence = QKeySequence( Qt::ShiftModifier ).toString();
00180     sequence.chop( 1 ); // chop superfluous '+'
00181     moveDropAction = popup.addAction( KIcon( QString::fromLatin1( "go-jump" ) ), i18n( "&Move Here" ) + QLatin1Char( '\t' ) + sequence );
00182   }
00183 
00184   if ( copyAllowed ) {
00185     sequence = QKeySequence( Qt::ControlModifier ).toString();
00186     sequence.chop( 1 ); // chop superfluous '+'
00187     copyDropAction = popup.addAction( KIcon( QString::fromLatin1( "edit-copy" ) ), i18n( "&Copy Here" ) + QLatin1Char( '\t' ) + sequence );
00188   }
00189 
00190   if ( linkAllowed ) {
00191     sequence = QKeySequence( Qt::ControlModifier + Qt::ShiftModifier ).toString();
00192     sequence.chop( 1 ); // chop superfluous '+'
00193     linkAction = popup.addAction( KIcon( QLatin1String( "edit-link" ) ), i18n( "&Link Here" ) + QLatin1Char( '\t' ) + sequence );
00194   }
00195 
00196   popup.addSeparator();
00197   popup.addAction( KIcon( QString::fromLatin1( "process-stop" ) ), i18n( "C&ancel" ) + QLatin1Char( '\t' ) + QKeySequence( Qt::Key_Escape ).toString() );
00198 
00199   QAction *activatedAction = popup.exec( QCursor::pos() );
00200 
00201   if ( !activatedAction ) {
00202     return false;
00203   } else if ( activatedAction == moveDropAction ) {
00204     event->setDropAction( Qt::MoveAction );
00205   } else if ( activatedAction == copyDropAction ) {
00206     event->setDropAction( Qt::CopyAction );
00207   } else if ( activatedAction == linkAction ) {
00208     event->setDropAction( Qt::LinkAction );
00209   } else {
00210     return false;
00211   }
00212 
00213   return true;
00214 }
00215 
00216 void DragDropManager::startDrag( Qt::DropActions supportedActions )
00217 {
00218   QModelIndexList indexes;
00219   bool sourceDeletable = true;
00220   foreach ( const QModelIndex &index, m_view->selectionModel()->selectedRows() ) {
00221     if ( !m_view->model()->flags( index ) & Qt::ItemIsDragEnabled )
00222       continue;
00223 
00224     if ( sourceDeletable ) {
00225       Collection source = index.data( EntityTreeModel::CollectionRole ).value<Collection>();
00226       if ( !source.isValid() ) {
00227         // index points to an item
00228         source = index.data( EntityTreeModel::ParentCollectionRole ).value<Collection>();
00229         sourceDeletable = source.rights() & Collection::CanDeleteItem;
00230       } else {
00231         // index points to a collection
00232         sourceDeletable = ( source.rights() & Collection::CanDeleteCollection ) && !source.hasAttribute<SpecialCollectionAttribute>() ;
00233       }
00234     }
00235     indexes.append( index );
00236   }
00237 
00238   if ( indexes.isEmpty() )
00239     return;
00240 
00241   QMimeData *mimeData = m_view->model()->mimeData( indexes );
00242   if ( !mimeData )
00243     return;
00244 
00245   QDrag *drag = new QDrag( m_view );
00246   drag->setMimeData( mimeData );
00247   if ( indexes.size() > 1 ) {
00248     drag->setPixmap( KIcon( QLatin1String( "document-multiple" ) ).pixmap( QSize( 22, 22 ) ) );
00249   } else {
00250     QPixmap pixmap = indexes.first().data( Qt::DecorationRole ).value<QIcon>().pixmap( QSize( 22, 22 ) );
00251     if ( pixmap.isNull() )
00252       pixmap = KIcon( QLatin1String( "text-plain" ) ).pixmap( QSize( 22, 22 ) );
00253     drag->setPixmap( pixmap );
00254   }
00255 
00256   if ( !sourceDeletable )
00257     supportedActions &= ~Qt::MoveAction;
00258 
00259   Qt::DropAction defaultAction = Qt::IgnoreAction;
00260   if ( (QApplication::keyboardModifiers() & Qt::ControlModifier) &&
00261        (QApplication::keyboardModifiers() & Qt::ShiftModifier) ) {
00262     defaultAction = Qt::LinkAction;
00263   } else if ( (QApplication::keyboardModifiers() & Qt::ControlModifier) ) {
00264     defaultAction = Qt::CopyAction;
00265   } else if ( (QApplication::keyboardModifiers() & Qt::ShiftModifier) ) {
00266     defaultAction = Qt::MoveAction;
00267   }
00268 
00269   drag->exec( supportedActions, defaultAction );
00270 }
00271 
00272 bool DragDropManager::showDropActionMenu() const
00273 {
00274   return mShowDropActionMenu;
00275 }
00276 
00277 void DragDropManager::setShowDropActionMenu( bool show )
00278 {
00279   mShowDropActionMenu = show;
00280 }

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