src/tagcloud/taggingpopup.cpp

   1 /*
   2    This file is part of the Nepomuk KDE project.
   3    Copyright (C) 2007 Sebastian Trueg <trueg@kde.org>
   4
   5    This library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public
   7    License version 2 as published by the Free Software Foundation.
   8
   9    This library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public License
  15    along with this library; see the file COPYING.LIB.  If not, write to
  16    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17    Boston, MA 02110-1301, USA.
  18  */
  19
  20 #include "taggingpopup.h"
  21
  22 #include <QtCore/QEventLoop>
  23 #include <QtCore/QPointer>
  24 #include <QtGui/QApplication>
  25 #include <QtGui/QDesktopWidget>
  26 #include <QtGui/QMouseEvent>
  27
  28 #include <KDebug>
  29 #include <KDialog>
  30
  31
  32 class Nepomuk::TaggingPopup::Private
  33 {
  34 public:
  35     Private( TaggingPopup* parent )
  36         : eventLoop( 0 ),
  37           m_parent( parent ) {
  38     }
  39
  40     QEventLoop* eventLoop;
  41     QPoint popupPos;
  42
  43     QRect geometryForPopupPos( const QPoint& p ) {
  44         QSize size = m_parent->sizeHint();
  45
  46         // we want a little margin
  47         const int margin = KDialog::marginHint();
  48         size.setHeight( size.height() + margin*2 );
  49         size.setWidth( size.width() + margin*2 );
  50
  51         QRect screen = QApplication::desktop()->screenGeometry( QApplication::desktop()->screenNumber( p ) );
  52
  53         // calculate popup position
  54         QPoint pos( p.x() - size.width()/2, p.y() - size.height()/2 );
  55
  56         // ensure we do not leave the desktop
  57         if ( pos.x() + size.width() > screen.right() ) {
  58             pos.setX( screen.right() - size.width() );
  59         }
  60         else if ( pos.x() < screen.left() ) {
  61             pos.setX( screen.left() );
  62         }
  63
  64         if ( pos.y() + size.height() > screen.bottom() ) {
  65             pos.setY( screen.bottom() - size.height() );
  66         }
  67         else if ( pos.y() < screen.top() ) {
  68             pos.setY( screen.top() );
  69         }
  70
  71         return QRect( pos, size );
  72     }
  73
  74 private:
  75     TaggingPopup* m_parent;
  76 };
  77
  78
  79 Nepomuk::TaggingPopup::TaggingPopup( QWidget* parent )
  80     : TagCloud( parent ),
  81       d( new Private( this ) )
  82 {
  83     setFrameStyle( QFrame::Box|QFrame::Plain );
  84     setWindowFlags( Qt::Popup );
  85 }
  86
  87
  88 Nepomuk::TaggingPopup::~TaggingPopup()
  89 {
  90     delete d;
  91 }
  92
  93
  94 void Nepomuk::TaggingPopup::popup( const QPoint& p )
  95 {
  96     setGeometry( d->geometryForPopupPos( p ) );
  97     d->popupPos = p;
  98
  99     show();
 100 }
 101
 102
 103 void Nepomuk::TaggingPopup::exec( const QPoint& pos )
 104 {
 105     QEventLoop eventLoop;
 106     d->eventLoop = &eventLoop;
 107     popup( pos );
 108
 109     QPointer<QObject> guard = this;
 110     (void) eventLoop.exec();
 111     if ( !guard.isNull() )
 112         d->eventLoop = 0;
 113 }
 114
 115
 116 void Nepomuk::TaggingPopup::mousePressEvent( QMouseEvent* e )
 117 {
 118     if ( !rect().contains( e->pos() ) ) {
 119         hide();
 120     }
 121     else {
 122         TagCloud::mousePressEvent( e );
 123     }
 124 }
 125
 126
 127 void Nepomuk::TaggingPopup::hideEvent( QHideEvent* e )
 128 {
 129     Q_UNUSED( e );
 130     if ( d->eventLoop ) {
 131         d->eventLoop->exit();
 132     }
 133 }
 134
 135
 136 bool Nepomuk::TaggingPopup::event( QEvent* e )
 137 {
 138     if ( e->type() == QEvent::LayoutRequest ) {
 139         if ( isVisible() ) {
 140             setGeometry( d->geometryForPopupPos( d->popupPos ) );
 141             return true;
 142         }
 143     }
 144
 145     return TagCloud::event( e );
 146 }
 147