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# ktabwidget.cpp

    00001 /* This file is part of the KDE libraries
    00002     Copyright (C) 2003 Stephan Binner <binner@kde.org>
    00003     Copyright (C) 2003 Zack Rusin <zack@kde.org>
    00004
    00005     This library is free software; you can redistribute it and/or
    00006     modify it under the terms of the GNU Library General Public
    00007     License as published by the Free Software Foundation; either
    00008     version 2 of the License, or (at your option) any later version.
    00009
    00010     This library is distributed in the hope that it will be useful,
    00011     but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00013     Library General Public License for more details.
    00014
    00015     You should have received a copy of the GNU Library General Public License
    00016     along with this library; see the file COPYING.LIB.  If not, write to
    00017     the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    00018     Boston, MA 02111-1307, USA.
    00019 */
    00020
    00021 #include <qapplication.h>
    00022 #include <qstyle.h>
    00023
    00024 #include <kconfig.h>
    00025 #include <kiconloader.h>
    00026 #include <kstringhandler.h>
    00027
    00028 #include "ktabwidget.h"
    00029 #include "ktabbar.h"
    00030
    00031 class KTabWidgetPrivate {
    00032 public:
    00033     bool m_automaticResizeTabs;
    00034     int m_maxLength;
    00035     int m_minLength;
    00036     unsigned int m_CurrentMaxLength;
    00037
    00038     //holds the full names of the tab, otherwise all we
    00039     //know about is the shortened name
    00040     QStringList m_tabNames;
    00041
    00042     KTabWidgetPrivate() {
    00043         m_automaticResizeTabs = false;
    00044         KConfigGroupSaver groupsaver(KGlobal::config(), "General");
    00045         m_maxLength = KGlobal::config()->readNumEntry("MaximumTabLength", 30);
    00046         m_minLength = KGlobal::config()->readNumEntry("MinimumTabLength", 3);
    00047         m_CurrentMaxLength = m_minLength;
    00048     }
    00049 };
    00050
    00051 KTabWidget::KTabWidget( QWidget *parent, const char *name, WFlags f )
    00052     : QTabWidget( parent, name, f )
    00053 {
    00054     d = new KTabWidgetPrivate;
    00055     setTabBar( new KTabBar(this, "tabbar") );
    00056     setAcceptDrops( true );
    00057
    00058     connect(tabBar(), SIGNAL(contextMenu( int, const QPoint & )), SLOT(contextMenu( int, const QPoint & )));
    00059     connect(tabBar(), SIGNAL(mouseDoubleClick( int )), SLOT(mouseDoubleClick( int )));
    00060     connect(tabBar(), SIGNAL(mouseMiddleClick( int )), SLOT(mouseMiddleClick( int )));
    00061     connect(tabBar(), SIGNAL(initiateDrag( int )), SLOT(initiateDrag( int )));
    00062     connect(tabBar(), SIGNAL(testCanDecode(const QDragMoveEvent *, bool & )), SIGNAL(testCanDecode(const QDragMoveEvent *, bool & )));
    00063     connect(tabBar(), SIGNAL(receivedDropEvent( int, QDropEvent * )), SLOT(receivedDropEvent( int, QDropEvent * )));
    00064     connect(tabBar(), SIGNAL(moveTab( int, int )), SLOT(moveTab( int, int )));
    00065     connect(tabBar(), SIGNAL(closeRequest( int )), SLOT(closeRequest( int )));
    00066 #ifndef QT_NO_WHEELEVENT
    00067     connect(tabBar(), SIGNAL(wheelDelta( int )), SLOT(wheelDelta( int )));
    00068 #endif
    00069 }
    00070
    00071 KTabWidget::~KTabWidget()
    00072 {
    00073     delete d;
    00074 }
    00075
    00076 void KTabWidget::insertTab( QWidget *child, const QString &label, int index )
    00077 {
    00078     QTabWidget::insertTab( child, label, index );
    00079 }
    00080
    00081 void KTabWidget::insertTab( QWidget *child, const QIconSet& iconset, const QString &label, int index )
    00082 {
    00083     QTabWidget::insertTab( child, iconset, label, index );
    00084 }
    00085
    00086 void KTabWidget::insertTab( QWidget *child, QTab *tab, int index )
    00087 {
    00088     QTabWidget::insertTab( child, tab, index);
    00089     if ( d->m_automaticResizeTabs ) {
    00090         if ( index < 0 || index >= count() ) {
    00091             d->m_tabNames.append( tab->text() );
    00092             resizeTabs( d->m_tabNames.count()-1 );
    00093         }
    00094         else {
    00095             d->m_tabNames.insert( d->m_tabNames.at( index ), tab->text() );
    00096             resizeTabs( index );
    00097         }
    00098     }
    00099 }
    00100
    00101 void KTabWidget::setTabBarHidden( bool hide )
    00102 {
    00103     QWidget *rightcorner = this->cornerWidget( TopRight );
    00104     QWidget *leftcorner = this->cornerWidget( TopLeft );
    00105
    00106     if ( hide ) {
    00107         if ( leftcorner ) leftcorner->hide();
    00108         if ( rightcorner ) rightcorner->hide();
    00109         tabBar()->hide();
    00110     } else {
    00111         tabBar()->show();
    00112         if ( leftcorner ) leftcorner->show();
    00113         if ( rightcorner ) rightcorner->show();
    00114     }
    00115 }
    00116
    00117 bool KTabWidget::isTabBarHidden() const
    00118 {
    00119     return !( tabBar()->isVisible() );
    00120 }
    00121
    00122 void KTabWidget::setTabColor( QWidget *w, const QColor& color )
    00123 {
    00124     QTab *t = tabBar()->tabAt( indexOf( w ) );
    00125     if (t) {
    00126         static_cast<KTabBar*>(tabBar())->setTabColor( t->identifier(), color );
    00127     }
    00128 }
    00129
    00130 QColor KTabWidget::tabColor( QWidget *w ) const
    00131 {
    00132     QTab *t = tabBar()->tabAt( indexOf( w ) );
    00133     if (t) {
    00134         return static_cast<KTabBar*>(tabBar())->tabColor( t->identifier() );
    00135     } else {
    00136         return QColor();
    00137     }
    00138 }
    00139
    00140 void KTabWidget::setTabReorderingEnabled( bool on)
    00141 {
    00142     static_cast<KTabBar*>(tabBar())->setTabReorderingEnabled( on );
    00143 }
    00144
    00145 bool KTabWidget::isTabReorderingEnabled() const
    00146 {
    00147     return static_cast<KTabBar*>(tabBar())->isTabReorderingEnabled();
    00148 }
    00149
    00150 void KTabWidget::setTabCloseActivatePrevious( bool previous)
    00151 {
    00152     static_cast<KTabBar*>(tabBar())->setTabCloseActivatePrevious( previous );
    00153 }
    00154
    00155 bool KTabWidget::tabCloseActivatePrevious() const
    00156 {
    00157     return static_cast<KTabBar*>(tabBar())->tabCloseActivatePrevious();
    00158 }
    00159
    00160 unsigned int KTabWidget::tabBarWidthForMaxChars( uint maxLength )
    00161 {
    00162     int hframe, overlap;
    00163     hframe  = tabBar()->style().pixelMetric( QStyle::PM_TabBarTabHSpace, tabBar() );
    00164     overlap = tabBar()->style().pixelMetric( QStyle::PM_TabBarTabOverlap, tabBar() );
    00165
    00166     QFontMetrics fm = tabBar()->fontMetrics();
    00167     int x = 0;
    00168     for( int i=0; i < count(); ++i ) {
    00169         QString newTitle = d->m_tabNames[ i ];
    00170         newTitle = KStringHandler::rsqueeze( newTitle, maxLength ).leftJustify( d->m_minLength, ' ' );
    00171
    00172         QTab* tab = tabBar()->tabAt( i );
    00173         int lw = fm.width( newTitle );
    00174         int iw = 0;
    00175         if ( tab->iconSet() )
    00176           iw = tab->iconSet()->pixmap( QIconSet::Small, QIconSet::Normal ).width() + 4;
    00177         x += ( tabBar()->style().sizeFromContents( QStyle::CT_TabBarTab, this,
    00178                    QSize( QMAX( lw + hframe + iw, QApplication::globalStrut().width() ), 0 ),
    00179                    QStyleOption( tab ) ) ).width();
    00180     }
    00181     return x;
    00182 }
    00183
    00184 void KTabWidget::changeTab( QWidget *w, const QString &label )
    00185 {
    00186     QTabWidget::changeTab( w, label );
    00187     if ( d->m_automaticResizeTabs ) {
    00188         int index = indexOf( w );
    00189         if ( index != -1 ) {
    00190             d->m_tabNames[ index ] = label;
    00191             resizeTabs( index );
    00192         }
    00193     }
    00194 }
    00195
    00196 void KTabWidget::changeTab( QWidget *w, const QIconSet &iconset, const QString &label )
    00197 {
    00198     QTabWidget::changeTab( w, iconset, label );
    00199     if ( d->m_automaticResizeTabs ) {
    00200         int index = indexOf( w );
    00201         if ( index != -1 ) {
    00202             d->m_tabNames[ index ] = label;
    00203             resizeTabs( index );
    00204         }
    00205     }
    00206 }
    00207
    00208 QString KTabWidget::label( int index ) const
    00209 {
    00210     if ( d->m_automaticResizeTabs ) {
    00211         if ( index >= 0 && index < count() )
    00212             return d->m_tabNames[ index ];
    00213         else
    00214             return QString::null;
    00215     }
    00216     else
    00217         return QTabWidget::label( index );
    00218 }
    00219
    00220 QString KTabWidget::tabLabel( QWidget * w ) const
    00221 {
    00222     if ( d->m_automaticResizeTabs ) {
    00223         int index = indexOf( w );
    00224         if ( index == -1 )
    00225             return QString::null;
    00226         else
    00227             return d->m_tabNames[ index ];
    00228     }
    00229     else
    00230         return QTabWidget::tabLabel( w );
    00231 }
    00232
    00233 void KTabWidget::setTabLabel( QWidget *w, const QString &l )
    00234 {
    00235     QTabWidget::setTabLabel( w, l );
    00236     if ( d->m_automaticResizeTabs ) {
    00237         int index = indexOf( w );
    00238         if ( index != -1 ) {
    00239             d->m_tabNames[ index ] = l;
    00240             resizeTabs( index );
    00241         }
    00242   }
    00243 }
    00244
    00245 void KTabWidget::resizeTabs( int changeTabIndex )
    00246 {
    00247     uint newMaxLength;
    00248     if ( d->m_automaticResizeTabs ) {
    00249         // Calculate new max length
    00250         newMaxLength=d->m_maxLength;
    00251         uint lcw=0, rcw=0;
    00252
    00253         int tabBarHeight = tabBar()->sizeHint().height();
    00254         if ( cornerWidget( TopLeft ) && cornerWidget( TopLeft )->isVisible() )
    00255             lcw = QMAX( cornerWidget( TopLeft )->width(), tabBarHeight );
    00256         if ( cornerWidget( TopRight ) && cornerWidget( TopRight )->isVisible() )
    00257             rcw = QMAX( cornerWidget( TopRight )->width(), tabBarHeight );
    00258
    00259         uint maxTabBarWidth = width() - lcw - rcw;
    00260
    00261         for ( ; newMaxLength > (uint)d->m_minLength; newMaxLength-- ) {
    00262             if ( tabBarWidthForMaxChars( newMaxLength ) < maxTabBarWidth )
    00263                 break;
    00264         }
    00265     }
    00266     else
    00267         newMaxLength = 4711;
    00268
    00269     // Update hinted or all tabs
    00270     if ( d->m_CurrentMaxLength != newMaxLength ) {
    00271         d->m_CurrentMaxLength = newMaxLength;
    00272         for( int i = 0; i < count(); ++i )
    00273             updateTab( i );
    00274     }
    00275     else if ( changeTabIndex != -1 )
    00276         updateTab( changeTabIndex );
    00277 }
    00278
    00279 void KTabWidget::updateTab( int index )
    00280 {
    00281     QString title = d->m_automaticResizeTabs ? d->m_tabNames[ index ] : QTabWidget::label( index );
    00282     removeTabToolTip( page( index ) );
    00283     if ( title.length() > d->m_CurrentMaxLength )
    00284         setTabToolTip( page( index ), title );
    00285
    00286     title = KStringHandler::rsqueeze( title, d->m_CurrentMaxLength ).leftJustify( d->m_minLength, ' ' );
    00287     title.replace( '&', "&&" );
    00288
    00289     if ( QTabWidget::label( index ) != title )
    00290         QTabWidget::setTabLabel( page( index ), title );
    00291 }
    00292
    00293 void KTabWidget::dragMoveEvent( QDragMoveEvent *e )
    00294 {
    00295     if ( isEmptyTabbarSpace( e->pos() ) ) {
    00296         bool accept = false;
    00297         // The receivers of the testCanDecode() signal has to adjust
    00298         // 'accept' accordingly.
    00299         emit testCanDecode( e, accept);
    00300         e->accept( accept );
    00301         return;
    00302     }
    00303     e->accept( false );
    00304     QTabWidget::dragMoveEvent( e );
    00305 }
    00306
    00307 void KTabWidget::dropEvent( QDropEvent *e )
    00308 {
    00309     if ( isEmptyTabbarSpace( e->pos() ) ) {
    00310         emit ( receivedDropEvent( e ) );
    00311         return;
    00312     }
    00313     QTabWidget::dropEvent( e );
    00314 }
    00315
    00316 #ifndef QT_NO_WHEELEVENT
    00317 void KTabWidget::wheelEvent( QWheelEvent *e )
    00318 {
    00319     if ( e->orientation() == Horizontal )
    00320         return;
    00321
    00322     if ( isEmptyTabbarSpace( e->pos() ) )
    00323         wheelDelta( e->delta() );
    00324     else
    00325         e->ignore();
    00326 }
    00327
    00328 void KTabWidget::wheelDelta( int delta )
    00329 {
    00330     if ( count() < 2 )
    00331         return;
    00332
    00333     int page = currentPageIndex();
    00334     if ( delta < 0 )
    00335          page = (page + 1) % count();
    00336     else {
    00337         page--;
    00338         if ( page < 0 )
    00339             page = count() - 1;
    00340     }
    00341     setCurrentPage( page );
    00342 }
    00343 #endif
    00344
    00345 void KTabWidget::mouseDoubleClickEvent( QMouseEvent *e )
    00346 {
    00347     if( e->button() != LeftButton )
    00348         return;
    00349
    00350     if ( isEmptyTabbarSpace( e->pos() ) ) {
    00351         emit( mouseDoubleClick() );
    00352         return;
    00353     }
    00354     QTabWidget::mouseDoubleClickEvent( e );
    00355 }
    00356
    00357 void KTabWidget::mousePressEvent( QMouseEvent *e )
    00358 {
    00359     if ( e->button() == RightButton ) {
    00360         if ( isEmptyTabbarSpace( e->pos() ) ) {
    00361             emit( contextMenu( mapToGlobal( e->pos() ) ) );
    00362             return;
    00363         }
    00364     } else if ( e->button() == MidButton ) {
    00365         if ( isEmptyTabbarSpace( e->pos() ) ) {
    00366             emit( mouseMiddleClick() );
    00367             return;
    00368         }
    00369     }
    00370     QTabWidget::mousePressEvent( e );
    00371 }
    00372
    00373 void KTabWidget::receivedDropEvent( int index, QDropEvent *e )
    00374 {
    00375     emit( receivedDropEvent( page( index ), e ) );
    00376 }
    00377
    00378 void KTabWidget::initiateDrag( int index )
    00379 {
    00380     emit( initiateDrag( page( index ) ) );
    00381 }
    00382
    00383 void KTabWidget::contextMenu( int index, const QPoint &p )
    00384 {
    00385     emit( contextMenu( page( index ), p ) );
    00386 }
    00387
    00388 void KTabWidget::mouseDoubleClick( int index )
    00389 {
    00390     emit( mouseDoubleClick( page( index ) ) );
    00391 }
    00392
    00393 void KTabWidget::mouseMiddleClick( int index )
    00394 {
    00395     emit( mouseMiddleClick( page( index ) ) );
    00396 }
    00397
    00398 void KTabWidget::moveTab( int from, int to )
    00399 {
    00400     QString tablabel = label( from );
    00401     QWidget *w = page( from );
    00402     QColor color = tabColor( w );
    00403     QIconSet tabiconset = tabIconSet( w );
    00404     QString tabtooltip = tabToolTip( w );
    00405     bool current = ( w == currentPage() );
    00406     bool enabled = isTabEnabled( w );
    00407     blockSignals(true);
    00408     removePage( w );
    00409
    00410     // Work-around kmdi brain damage which calls showPage() in insertTab()
    00411     QTab * t = new QTab();
    00412     t->setText(tablabel);
    00413     QTabWidget::insertTab( w, t, to );
    00414     if ( d->m_automaticResizeTabs ) {
    00415         if ( to < 0 || to >= count() )
    00416             d->m_tabNames.append( QString::null );
    00417         else
    00418             d->m_tabNames.insert( d->m_tabNames.at( to ), QString::null );
    00419     }
    00420
    00421     w = page( to );
    00422     changeTab( w, tabiconset, tablabel );
    00423     setTabToolTip( w, tabtooltip );
    00424     setTabColor( w, color );
    00425     if ( current )
    00426         showPage( w );
    00427     setTabEnabled( w, enabled );
    00428     blockSignals(false);
    00429
    00430     emit ( movedTab( from, to ) );
    00431 }
    00432
    00433 void KTabWidget::removePage( QWidget * w ) {
    00434     if ( d->m_automaticResizeTabs ) {
    00435         int index = indexOf( w );
    00436         if ( index != -1 )
    00437             d->m_tabNames.remove( d->m_tabNames.at( index ) );
    00438     }
    00439     QTabWidget::removePage( w );
    00440     if ( d->m_automaticResizeTabs )
    00441         resizeTabs();
    00442 }
    00443
    00444
    00445 bool KTabWidget::isEmptyTabbarSpace( const QPoint &p ) const
    00446 {
    00447     QPoint point( p );
    00448     QSize size( tabBar()->sizeHint() );
    00449     if ( ( tabPosition()==Top && point.y()< size.height() ) || ( tabPosition()==Bottom && point.y()>(height()-size.height() ) ) ) {
    00450         QWidget *rightcorner = cornerWidget( TopRight );
    00451         if ( rightcorner ) {
    00452             if ( point.x()>=width()-rightcorner->width() )
    00453                 return false;
    00454         }
    00455         QWidget *leftcorner = cornerWidget( TopLeft );
    00456         if ( leftcorner ) {
    00457             if ( point.x()<=leftcorner->width() )
    00458                 return false;
    00459             point.setX( point.x()-size.height() );
    00460         }
    00461         if ( tabPosition()==Bottom )
    00462             point.setY( point.y()-( height()-size.height() ) );
    00463         QTab *tab = tabBar()->selectTab( point);
    00464         if( !tab )
    00465             return true;
    00466     }
    00467     return false;
    00468 }
    00469
    00470 void KTabWidget::setHoverCloseButton( bool button )
    00471 {
    00472     static_cast<KTabBar*>(tabBar())->setHoverCloseButton( button );
    00473 }
    00474
    00475 bool KTabWidget::hoverCloseButton() const
    00476 {
    00477     return static_cast<KTabBar*>(tabBar())->hoverCloseButton();
    00478 }
    00479
    00480 void KTabWidget::setHoverCloseButtonDelayed( bool delayed )
    00481 {
    00482     static_cast<KTabBar*>(tabBar())->setHoverCloseButtonDelayed( delayed );
    00483 }
    00484
    00485 bool KTabWidget::hoverCloseButtonDelayed() const
    00486 {
    00487     return static_cast<KTabBar*>(tabBar())->hoverCloseButtonDelayed();
    00488 }
    00489
    00490 void KTabWidget::setAutomaticResizeTabs( bool enabled )
    00491 {
    00492     if ( d->m_automaticResizeTabs==enabled )
    00493         return;
    00494
    00495     d->m_automaticResizeTabs = enabled;
    00496     if ( enabled ) {
    00497         d->m_tabNames.clear();
    00498         for( int i = 0; i < count(); ++i )
    00499             d->m_tabNames.append( tabBar()->tabAt( i )->text() );
    00500     }
    00501     else
    00502         for( int i = 0; i < count(); ++i )
    00503             tabBar()->tabAt( i )->setText( d->m_tabNames[ i ] );
    00504     resizeTabs();
    00505 }
    00506
    00507 bool KTabWidget::automaticResizeTabs() const
    00508 {
    00509     return d->m_automaticResizeTabs;
    00510 }
    00511
    00512 void KTabWidget::closeRequest( int index )
    00513 {
    00514     emit( closeRequest( page( index ) ) );
    00515 }
    00516
    00517 void KTabWidget::resizeEvent( QResizeEvent *e )
    00518 {
    00519     QTabWidget::resizeEvent( e );
    00520     resizeTabs();
    00521 }
    00522
    00523 #include "ktabwidget.moc"

This file is part of the documentation for kdeui Library Version 3.4.1.
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