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

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