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akonadi

erroroverlay.cpp
00001 /*
00002     Copyright (c) 2008 Volker Krause <vkrause@kde.org>
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 "erroroverlay_p.h"
00021 #include "ui_erroroverlay.h"
00022 #include "selftestdialog_p.h"
00023 
00024 #include <KDebug>
00025 #include <KIcon>
00026 #include <KLocale>
00027 
00028 #include <QtCore/QEvent>
00029 #include <QtGui/QBoxLayout>
00030 #include <QtGui/QLabel>
00031 #include <QtGui/QPalette>
00032 
00033 using namespace Akonadi;
00034 
00035 //@cond PRIVATE
00036 
00037 class ErrorOverlayStatic
00038 {
00039   public:
00040     QVector<QPair<QPointer<QWidget>, QPointer<QWidget> > > baseWidgets;
00041 };
00042 
00043 K_GLOBAL_STATIC( ErrorOverlayStatic, sInstanceOverlay )
00044 
00045 static bool isParentOf( QObject* o1, QObject* o2 )
00046 {
00047   if ( !o1 || !o2 )
00048     return false;
00049   if ( o1 == o2 )
00050     return true;
00051   return isParentOf( o1, o2->parent() );
00052 }
00053 
00054 ErrorOverlay::ErrorOverlay( QWidget *baseWidget, QWidget * parent ) :
00055     QWidget( parent ? parent : baseWidget->window() ),
00056     mBaseWidget( baseWidget ),
00057     mBaseWidgetIsParent( false ),
00058     ui( new Ui::ErrorOverlay )
00059 {
00060   Q_ASSERT( baseWidget );
00061 
00062   mBaseWidgetIsParent = isParentOf( mBaseWidget, this );
00063 
00064   // check existing overlays to detect cascading
00065   for ( QVector<QPair< QPointer<QWidget>, QPointer<QWidget> > >::Iterator it = sInstanceOverlay->baseWidgets.begin();
00066         it != sInstanceOverlay->baseWidgets.end(); ) {
00067     if ( (*it).first == 0 || (*it).second == 0 ) {
00068       // garbage collection
00069       it = sInstanceOverlay->baseWidgets.erase( it );
00070       continue;
00071     }
00072     if ( isParentOf( (*it).first, baseWidget ) ) {
00073       // parent already has an overlay, kill ourselves
00074       mBaseWidget = 0;
00075       hide();
00076       deleteLater();
00077       return;
00078     }
00079     if ( isParentOf( baseWidget, (*it).first ) ) {
00080       // child already has overlay, kill that one
00081       delete (*it).second;
00082       it = sInstanceOverlay->baseWidgets.erase( it );
00083       continue;
00084     }
00085     ++it;
00086   }
00087   sInstanceOverlay->baseWidgets.append( qMakePair( mBaseWidget, QPointer<QWidget>( this ) ) );
00088 
00089   connect( baseWidget, SIGNAL( destroyed() ), SLOT( deleteLater() ) );
00090   mPreviousState = mBaseWidget->isEnabled();
00091 
00092   ui->setupUi( this );
00093   ui->notRunningIcon->setPixmap( KIcon( QLatin1String( "akonadi" ) ).pixmap( 64 ) );
00094   ui->brokenIcon->setPixmap( KIcon( QString::fromLatin1( "dialog-error" ) ).pixmap( 64 ) );
00095   ui->progressIcon->setPixmap( KIcon( QLatin1String( "akonadi" ) ).pixmap( 32 ) );
00096 
00097   connect( ui->startButton, SIGNAL( clicked() ), SLOT( startClicked() ) );
00098   connect( ui->selfTestButton, SIGNAL( clicked() ), SLOT( selfTestClicked() ) );
00099 
00100   const ServerManager::State state = ServerManager::state();
00101   mOverlayActive = state == ServerManager::Running;
00102   serverStateChanged( state );
00103   connect( ServerManager::self(), SIGNAL( stateChanged( Akonadi::ServerManager::State ) ),
00104            SLOT( serverStateChanged( Akonadi::ServerManager::State ) ) );
00105 
00106   QPalette p = palette();
00107   p.setColor( backgroundRole(), QColor( 0, 0, 0, 128 ) );
00108   p.setColor( foregroundRole(), Qt::white );
00109   setPalette( p );
00110   setAutoFillBackground( true );
00111 
00112   mBaseWidget->installEventFilter( this );
00113 
00114   reposition();
00115 }
00116 
00117 ErrorOverlay::~ ErrorOverlay()
00118 {
00119   if ( mBaseWidget && !mBaseWidgetIsParent )
00120     mBaseWidget->setEnabled( mPreviousState );
00121 }
00122 
00123 void ErrorOverlay::reposition()
00124 {
00125   if ( !mBaseWidget )
00126     return;
00127 
00128   // reparent to the current top level widget of the base widget if needed
00129   // needed eg. in dock widgets
00130   if ( parentWidget() != mBaseWidget->window() )
00131     setParent( mBaseWidget->window() );
00132 
00133   // follow base widget visibility
00134   // needed eg. in tab widgets
00135   if ( !mBaseWidget->isVisible() ) {
00136     hide();
00137     return;
00138   }
00139   if ( mOverlayActive )
00140     show();
00141 
00142   // follow position changes
00143   const QPoint topLevelPos = mBaseWidget->mapTo( window(), QPoint( 0, 0 ) );
00144   const QPoint parentPos = parentWidget()->mapFrom( window(), topLevelPos );
00145   move( parentPos );
00146 
00147   // follow size changes
00148   // TODO: hide/scale icon if we don't have enough space
00149   resize( mBaseWidget->size() );
00150 }
00151 
00152 bool ErrorOverlay::eventFilter(QObject * object, QEvent * event)
00153 {
00154   if ( object == mBaseWidget && mOverlayActive &&
00155     ( event->type() == QEvent::Move || event->type() == QEvent::Resize ||
00156       event->type() == QEvent::Show || event->type() == QEvent::Hide ||
00157       event->type() == QEvent::ParentChange ) ) {
00158     reposition();
00159   }
00160   return QWidget::eventFilter( object, event );
00161 }
00162 
00163 void ErrorOverlay::startClicked()
00164 {
00165   ServerManager::start();
00166 }
00167 
00168 void ErrorOverlay::selfTestClicked()
00169 {
00170   SelfTestDialog dlg;
00171   dlg.exec();
00172 }
00173 
00174 void ErrorOverlay::serverStateChanged( ServerManager::State state )
00175 {
00176   if ( !mBaseWidget )
00177     return;
00178 
00179   if ( state == ServerManager::Running && mOverlayActive ) {
00180     mOverlayActive = false;
00181     hide();
00182     if ( !mBaseWidgetIsParent )
00183       mBaseWidget->setEnabled( mPreviousState );
00184   } else if ( !mOverlayActive ) {
00185     mOverlayActive = true;
00186     if ( mBaseWidget->isVisible() )
00187       show();
00188 
00189     if ( !mBaseWidgetIsParent ) {
00190       mPreviousState = mBaseWidget->isEnabled();
00191       mBaseWidget->setEnabled( false );
00192     }
00193 
00194     reposition();
00195   }
00196 
00197   if ( mOverlayActive ) {
00198     switch ( state ) {
00199       case ServerManager::NotRunning:
00200         ui->stackWidget->setCurrentWidget( ui->notRunningPage );
00201         break;
00202       case ServerManager::Broken:
00203         ui->stackWidget->setCurrentWidget( ui->brokenPage );
00204         break;
00205       case ServerManager::Starting:
00206         ui->progressPage->setToolTip( i18n( "Personal information management service is starting..." ) );
00207         ui->progressDescription->setText( i18n( "Personal information management service is starting..." ) );
00208         ui->stackWidget->setCurrentWidget( ui->progressPage );
00209         break;
00210       case ServerManager::Stopping:
00211         ui->progressPage->setToolTip( i18n( "Personal information management service is shutting down..." ) );
00212         ui->progressDescription->setText( i18n( "Personal information management service is shutting down..." ) );
00213         ui->stackWidget->setCurrentWidget( ui->progressPage );
00214         break;
00215       case ServerManager::Running:
00216         break;
00217     }
00218   }
00219 }
00220 
00221 //@endcond
00222 
00223 #include "erroroverlay_p.moc"

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