kparts/statusbarextension.cpp

   1 /* This file is part of the KDE project
   2    Copyright (C) 2003 Daniel Molkentin <molkentin@kde.org>
   3    Copyright (C) 2003 David Faure <faure@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 as published by the Free Software Foundation; either
   8    version 2 of the License, or (at your option) any later version.
   9
  10    This library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public License
  16    along with this library; see the file COPYING.LIB.  If not, write to
  17    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18    Boston, MA 02110-1301, USA.
  19  */
  20
  21 #include "statusbarextension.h"
  22
  23 #include <QtCore/QObject>
  24
  25 #include <kstatusbar.h>
  26 #include <kmainwindow.h>
  27 #include <kdebug.h>
  28 #include <kparts/part.h>
  29 #include <kparts/event.h>
  30
  31 using namespace KParts;
  32
  33 ///////////////////////////////////////////////////////////////////
  34 // Helper Classes
  35 ///////////////////////////////////////////////////////////////////
  36
  37 class KParts::StatusBarItem {
  38   public:
  39     StatusBarItem() // for QValueList
  40       : m_widget(0), m_visible(false)
  41       {}
  42     StatusBarItem( QWidget * widget, int stretch, bool permanent )
  43       : m_widget(widget), m_stretch(stretch), m_permanent(permanent), m_visible(false)
  44       {}
  45
  46     QWidget * widget() const { return m_widget; }
  47
  48     void ensureItemShown( KStatusBar * sb )
  49     {
  50       if ( !m_visible )
  51       {
  52         if ( m_permanent )
  53             sb->addPermanentWidget( m_widget, m_stretch );
  54         else
  55             sb->addWidget( m_widget, m_stretch );
  56         m_visible = true;
  57         m_widget->show();
  58       }
  59     }
  60     void ensureItemHidden( KStatusBar * sb )
  61     {
  62       if ( m_visible )
  63       {
  64         sb->removeWidget( m_widget );
  65         m_visible = false;
  66         m_widget->hide();
  67       }
  68     }
  69   private:
  70     QWidget * m_widget;
  71     int m_stretch;
  72     bool m_permanent;
  73     bool m_visible;  // true when the item has been added to the statusbar
  74 };
  75
  76 class KParts::StatusBarExtensionPrivate
  77 {
  78 public:
  79   StatusBarExtensionPrivate(StatusBarExtension *q): q(q),
  80                                                     m_statusBar(0) {}
  81
  82   StatusBarExtension *q;
  83   QList<StatusBarItem> m_statusBarItems; // Our statusbar items
  84   KStatusBar* m_statusBar;
  85 };
  86
  87 ///////////////////////////////////////////////////////////////////
  88
  89
  90 StatusBarExtension::StatusBarExtension(KParts::ReadOnlyPart *parent)
  91   : QObject(parent), d(new StatusBarExtensionPrivate(this))
  92 {
  93   parent->installEventFilter(this);
  94 }
  95
  96 StatusBarExtension::~StatusBarExtension()
  97 {
  98   delete d;
  99 }
 100
 101
 102 StatusBarExtension *StatusBarExtension::childObject( QObject *obj )
 103 {
 104     if ( !obj )
 105         return 0;
 106
 107     // we try to do it on our own, in hope that we are faster than
 108     // queryList, which looks kind of big :-)
 109     const QObjectList &children = obj->children();
 110     QObjectList::ConstIterator it = children.begin();
 111     for (; it != children.end(); ++it ) {
 112         KParts::StatusBarExtension* ext = ::qobject_cast<KParts::StatusBarExtension *>( *it );
 113         if ( ext )
 114             return ext;
 115     }
 116
 117     return 0;
 118 }
 119
 120 bool StatusBarExtension::eventFilter(QObject * watched, QEvent* ev)
 121 {
 122   if ( !GUIActivateEvent::test( ev ) ||
 123        !::qobject_cast<KParts::ReadOnlyPart *>(watched)  )
 124       return QObject::eventFilter(watched, ev);
 125
 126   KStatusBar * sb = statusBar();
 127   if ( !sb )
 128       return QObject::eventFilter(watched, ev);
 129
 130   GUIActivateEvent *gae = static_cast<GUIActivateEvent*>(ev);
 131
 132   if ( gae->activated() )
 133   {
 134     QList<StatusBarItem>::iterator it = d->m_statusBarItems.begin();
 135     for ( ; it != d->m_statusBarItems.end() ; ++it )
 136       (*it).ensureItemShown( sb );
 137   }
 138   else
 139   {
 140     QList<StatusBarItem>::iterator it = d->m_statusBarItems.begin();
 141     for ( ; it != d->m_statusBarItems.end() ; ++it )
 142       (*it).ensureItemHidden( sb );
 143   }
 144
 145   return false;
 146
 147 }
 148
 149 KStatusBar * StatusBarExtension::statusBar() const
 150 {
 151   if ( !d->m_statusBar )  {
 152     QWidget* w = static_cast<KParts::ReadOnlyPart*>(parent())->widget();
 153     KMainWindow* mw = dynamic_cast<KMainWindow *>( w->topLevelWidget() );
 154     if ( mw )
 155       d->m_statusBar = mw->statusBar();
 156   }
 157   return d->m_statusBar;
 158 }
 159
 160 void StatusBarExtension::setStatusBar( KStatusBar* status )
 161 {
 162   d->m_statusBar = status;
 163 }
 164
 165 void StatusBarExtension::addStatusBarItem( QWidget * widget, int stretch, bool permanent )
 166 {
 167   d->m_statusBarItems.append( StatusBarItem( widget, stretch, permanent ) );
 168   StatusBarItem& it = d->m_statusBarItems.last();
 169   KStatusBar * sb = statusBar();
 170   if (sb)
 171     it.ensureItemShown( sb );
 172 }
 173
 174 void StatusBarExtension::removeStatusBarItem( QWidget * widget )
 175 {
 176   KStatusBar * sb = statusBar();
 177   QList<StatusBarItem>::iterator it = d->m_statusBarItems.begin();
 178   for ( ; it != d->m_statusBarItems.end() ; ++it )
 179     if ( (*it).widget() == widget )
 180     {
 181       if ( sb )
 182         (*it).ensureItemHidden( sb );
 183       d->m_statusBarItems.erase( it );
 184       break;
 185     }
 186   if ( it == d->m_statusBarItems.end() )
 187     kWarning(1000) << "StatusBarExtension::removeStatusBarItem. Widget not found : " << widget;
 188 }
 189
 190 #include "statusbarextension.moc"
 191
 192 // vim: ts=2 sw=2 et