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akonadi

collectionstatisticsdelegate.cpp

00001 /*
00002     Copyright (c) 2008 Thomas McGuire <thomas.mcguire@gmx.net>
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 "collectionstatisticsdelegate.h"
00021 #include "collectionstatisticsmodel.h"
00022 
00023 #include <kcolorscheme.h>
00024 #include <kdebug.h>
00025 
00026 #include <QtGui/QPainter>
00027 #include <QtGui/QStyle>
00028 #include <QtGui/QStyleOption>
00029 #include <QtGui/QStyleOptionViewItemV4>
00030 #include <QtGui/QTreeView>
00031 
00032 #include "entitytreemodel.h"
00033 #include "collectionstatistics.h"
00034 #include "collection.h"
00035 #include "progressspinnerdelegate_p.h"
00036 
00037 using namespace Akonadi;
00038 
00039 namespace Akonadi {
00040 
00041 enum CountType
00042 {
00043   UnreadCount,
00044   TotalCount
00045 };
00046 
00047 class CollectionStatisticsDelegatePrivate
00048 {
00049   public:
00050     QTreeView *parent;
00051     bool drawUnreadAfterFolder;
00052     DelegateAnimator *animator;
00053     QColor mSelectedUnreadColor;
00054     QColor mDeselectedUnreadColor;
00055 
00056     CollectionStatisticsDelegatePrivate( QTreeView *treeView )
00057         : parent( treeView ),
00058           drawUnreadAfterFolder( false ),
00059           animator( 0 )
00060     {
00061       mSelectedUnreadColor = KColorScheme( QPalette::Active, KColorScheme::Selection )
00062                                          .foreground( KColorScheme::LinkText ).color();
00063       mDeselectedUnreadColor = KColorScheme( QPalette::Active, KColorScheme::View )
00064                                            .foreground( KColorScheme::LinkText ).color();
00065     }
00066 
00067     template<CountType countType>
00068     qint64 getCountRecursive( const QModelIndex &index ) const
00069     {
00070       Collection collection = qvariant_cast<Collection>( index.data( EntityTreeModel::CollectionRole ) );
00071       Q_ASSERT( collection.isValid() );
00072       CollectionStatistics statistics = collection.statistics();
00073       qint64 count = qMax( 0LL, countType == UnreadCount ? statistics.unreadCount() : statistics.count() );
00074 
00075       if ( index.model()->hasChildren( index ) )
00076       {
00077         for ( int row = 0; row < index.model()->rowCount( index ); row++ )
00078         {
00079           static const int column = 0;
00080           count += getCountRecursive<countType>( index.model()->index( row, column, index ) );
00081         }
00082       }
00083       return count;
00084     }
00085 };
00086 
00087 }
00088 
00089 CollectionStatisticsDelegate::CollectionStatisticsDelegate( QTreeView *parent )
00090   : QStyledItemDelegate( parent ),
00091     d_ptr( new CollectionStatisticsDelegatePrivate( parent ) )
00092 {
00093 
00094 }
00095 
00096 CollectionStatisticsDelegate::~CollectionStatisticsDelegate()
00097 {
00098   delete d_ptr;
00099 }
00100 
00101 void CollectionStatisticsDelegate::setUnreadCountShown( bool enable )
00102 {
00103   Q_D( CollectionStatisticsDelegate );
00104   d->drawUnreadAfterFolder = enable;
00105 }
00106 
00107 bool CollectionStatisticsDelegate::unreadCountShown() const
00108 {
00109   Q_D( const CollectionStatisticsDelegate );
00110   return d->drawUnreadAfterFolder;
00111 }
00112 
00113 void CollectionStatisticsDelegate::setProgressAnimationEnabled( bool enable )
00114 {
00115   Q_D( CollectionStatisticsDelegate );
00116   if ( enable == ( d->animator != 0 ) )
00117       return;
00118   if ( enable ) {
00119     Q_ASSERT( !d->animator );
00120     Akonadi::DelegateAnimator *animator = new Akonadi::DelegateAnimator( d->parent );
00121     d->animator = animator;
00122   } else {
00123     delete d->animator;
00124     d->animator = 0;
00125   }
00126 }
00127 
00128 bool CollectionStatisticsDelegate::progressAnimationEnabled() const
00129 {
00130   Q_D( const CollectionStatisticsDelegate );
00131   return d->animator != 0;
00132 }
00133 
00134 void CollectionStatisticsDelegate::initStyleOption( QStyleOptionViewItem *option,
00135                                                     const QModelIndex &index ) const
00136 {
00137   Q_D( const CollectionStatisticsDelegate );
00138 
00139   QStyleOptionViewItemV4 *noTextOption =
00140       qstyleoption_cast<QStyleOptionViewItemV4 *>( option );
00141   QStyledItemDelegate::initStyleOption( noTextOption, index );
00142   noTextOption->text.clear();
00143 
00144   if ( d->animator ) {
00145 
00146     const Akonadi::Collection collection = index.data(Akonadi::EntityTreeModel::CollectionRole).value<Akonadi::Collection>();
00147 
00148     if (!collection.isValid())
00149     {
00150       d->animator->pop(index);
00151       return;
00152     }
00153 
00154     if (index.data(Akonadi::EntityTreeModel::FetchStateRole).toInt() != Akonadi::EntityTreeModel::FetchingState)
00155     {
00156       d->animator->pop(index);
00157       return;
00158     }
00159 
00160     d->animator->push(index);
00161 
00162     if (QStyleOptionViewItemV4 *v4 = qstyleoption_cast<QStyleOptionViewItemV4 *>(option)) {
00163       v4->icon = d->animator->sequenceFrame(index);
00164     }
00165   }
00166 }
00167 
00168 class PainterStateSaver
00169 {
00170   public:
00171     PainterStateSaver( QPainter *painter )
00172     {
00173       mPainter = painter;
00174       mPainter->save();
00175     }
00176 
00177     ~PainterStateSaver()
00178     {
00179       mPainter->restore();
00180     }
00181 
00182   private:
00183     QPainter *mPainter;
00184 };
00185 
00186 void CollectionStatisticsDelegate::paint( QPainter *painter,
00187                                           const QStyleOptionViewItem &option,
00188                                           const QModelIndex &index ) const
00189 {
00190   Q_D( const CollectionStatisticsDelegate );
00191   PainterStateSaver stateSaver( painter );
00192 
00193   // First, paint the basic, but without the text. We remove the text
00194   // in initStyleOption(), which gets called by QStyledItemDelegate::paint().
00195   QStyledItemDelegate::paint( painter, option, index );
00196 
00197   // No, we retrieve the correct style option by calling intiStyleOption from
00198   // the superclass.
00199   QStyleOptionViewItemV4 option4 = option;
00200   QStyledItemDelegate::initStyleOption( &option4, index );
00201   QString text = option4.text;
00202 
00203   // Now calculate the rectangle for the text
00204   QStyle *s = d->parent->style();
00205   const QWidget *widget = option4.widget;
00206   QRect textRect = s->subElementRect( QStyle::SE_ItemViewItemText, &option4, widget );
00207 
00208    // When checking if the item is expanded, we need to check that for the first
00209   // column, as Qt only recogises the index as expanded for the first column
00210   QModelIndex firstColumn = index.model()->index( index.row(), 0, index.parent() );
00211   bool expanded = d->parent->isExpanded( firstColumn );
00212 
00213   if ( option.state & QStyle::State_Selected ) {
00214     painter->setPen( option.palette.highlightedText().color() );
00215   }
00216 
00217   Collection collection = index.sibling( index.row(), 0 ).data( EntityTreeModel::CollectionRole ).value<Collection>();
00218 
00219   Q_ASSERT(collection.isValid());
00220 
00221   CollectionStatistics statistics = collection.statistics();
00222 
00223   qint64 unreadCount = qMax( 0LL, statistics.unreadCount() );
00224   qint64 unreadRecursiveCount = d->getCountRecursive<UnreadCount>( index.sibling( index.row(), 0 ) );
00225 
00226   // Draw the unread count after the folder name (in parenthesis)
00227   if ( d->drawUnreadAfterFolder && index.column() == 0 ) {
00228     // Construct the string which will appear after the foldername (with the
00229     // unread count)
00230     QString unread;
00231 //     qDebug() << expanded << unreadCount << unreadRecursiveCount;
00232     if ( expanded && unreadCount > 0 )
00233       unread = QString( QLatin1String( " (%1)" ) ).arg( unreadCount );
00234     else if ( !expanded ) {
00235       if ( unreadCount != unreadRecursiveCount )
00236         unread = QString( QLatin1String( " (%1 + %2)" ) ).arg( unreadCount ).arg( unreadRecursiveCount - unreadCount );
00237       else if ( unreadCount > 0 )
00238         unread = QString( QLatin1String( " (%1)" ) ).arg( unreadCount );
00239     }
00240 
00241     PainterStateSaver stateSaver( painter );
00242 
00243     if ( !unread.isEmpty() ) {
00244       QFont font = painter->font();
00245       font.setBold( true );
00246       painter->setFont( font );
00247     }
00248 
00249     // Squeeze the folder text if it is to big and calculate the rectangles
00250     // where the folder text and the unread count will be drawn to
00251     QString folderName = text;
00252     QFontMetrics fm( painter->fontMetrics() );
00253     int unreadWidth = fm.width( unread );
00254     if ( fm.width( folderName ) + unreadWidth > textRect.width() ) {
00255       folderName = fm.elidedText( folderName, Qt::ElideRight,
00256                                   textRect.width() - unreadWidth );
00257     }
00258     int folderWidth = fm.width( folderName );
00259     QRect folderRect = textRect;
00260     QRect unreadRect = textRect;
00261     folderRect.setRight( textRect.left() + folderWidth );
00262     unreadRect.setLeft( folderRect.right() );
00263 
00264     // Draw folder name and unread count
00265     painter->drawText( folderRect, Qt::AlignLeft, folderName );
00266 
00267     const QColor unreadColor = (option.state & QStyle::State_Selected) ? d->mSelectedUnreadColor : d->mDeselectedUnreadColor;
00268     painter->setPen( unreadColor );
00269     painter->drawText( unreadRect, Qt::AlignLeft, unread );
00270 
00271     return;
00272   }
00273 
00274   // For the unread/total column, paint the summed up count if the item
00275   // is collapsed
00276   if ( ( index.column() == 1 || index.column() == 2 ) ) {
00277 
00278     PainterStateSaver stateSaver( painter );
00279 
00280     QStyleOptionViewItem opt = option;
00281 
00282     QString sumText;
00283     if ( index.column() == 1 && ( ( !expanded && unreadRecursiveCount > 0 ) || ( expanded && unreadCount > 0 ) ) ) {
00284       QFont font = painter->font();
00285       font.setBold( true );
00286       painter->setFont( font );
00287       sumText = QString::number( expanded ? unreadCount : unreadRecursiveCount );
00288     } else {
00289 
00290       qint64 totalCount = statistics.unreadCount();
00291       qint64 totalRecursiveCount = d->getCountRecursive<TotalCount>( index.sibling( index.row(), 0 ) );
00292       if (index.column() == 2 && ( ( !expanded && totalRecursiveCount > 0 ) || ( expanded && totalCount > 0 ) ) ) {
00293         sumText = QString::number( expanded ? totalCount : totalRecursiveCount );
00294       }
00295     }
00296 
00297     painter->drawText( textRect, Qt::AlignRight, sumText );
00298 
00299     return;
00300   }
00301 
00302   painter->drawText( textRect, option4.displayAlignment, text );
00303 }
00304 
00305 #include "collectionstatisticsdelegate.moc"

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