KParts

statusbarextension.cpp

00001 /* This file is part of the KDE project
00002    Copyright (C) 2003 Daniel Molkentin <molkentin@kde.org>
00003    Copyright (C) 2003 David Faure <faure@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., 51 Franklin Street, Fifth Floor,
00018    Boston, MA 02110-1301, USA.
00019  */
00020 
00021 #include "statusbarextension.h"
00022 
00023 #include <qvaluelist.h>
00024 #include <qobjectlist.h>
00025 
00026 #include <kstatusbar.h>
00027 #include <kmainwindow.h>
00028 #include <kdebug.h>
00029 #include <kdelibs_export.h>
00030 #include <kparts/part.h>
00031 #include <kparts/event.h>
00032 
00033 using namespace KParts;
00034 
00036 // Helper Classes
00038 
00039 class KParts::StatusBarItem {
00040   public:
00041     StatusBarItem() // for QValueList
00042       : m_widget(0), m_visible(false)
00043       {}
00044     StatusBarItem( QWidget * widget, int stretch, bool permanent )
00045       : m_widget(widget), m_stretch(stretch), m_permanent(permanent), m_visible(false)
00046       {}
00047 
00048     QWidget * widget() const { return m_widget; }
00049 
00050     void ensureItemShown( KStatusBar * sb )
00051     {
00052       if ( !m_visible )
00053       {
00054         sb->addWidget( m_widget, m_stretch, m_permanent );
00055         m_visible = true;
00056         m_widget->show();
00057       }
00058     }
00059     void ensureItemHidden( KStatusBar * sb )
00060     {
00061       if ( m_visible )
00062       {
00063         sb->removeWidget( m_widget );
00064         m_visible = false;
00065         m_widget->hide();
00066       }
00067     }
00068   private:
00069     QWidget * m_widget;
00070     int m_stretch;
00071     bool m_permanent;
00072     bool m_visible;  // true when the item has been added to the statusbar
00073 };
00074 
00076 
00077 
00078 StatusBarExtension::StatusBarExtension(KParts::ReadOnlyPart *parent, const char* name)
00079   : QObject(parent, name), m_statusBar(0), d(0)
00080 {
00081   parent->installEventFilter(this);
00082 }
00083 
00084 StatusBarExtension::~StatusBarExtension()
00085 {
00086 }
00087 
00088 
00089 StatusBarExtension *StatusBarExtension::childObject( QObject *obj )
00090 {
00091     if ( !obj || !obj->children() )
00092         return 0L;
00093 
00094     // we try to do it on our own, in hope that we are faster than
00095     // queryList, which looks kind of big :-)
00096     const QObjectList *children = obj->children();
00097     QObjectListIt it( *children );
00098     for (; it.current(); ++it )
00099         if ( it.current()->inherits( "KParts::StatusBarExtension" ) )
00100             return static_cast<KParts::StatusBarExtension *>( it.current() );
00101 
00102     return 0L;
00103 }
00104 
00105 bool StatusBarExtension::eventFilter(QObject * watched, QEvent* ev)
00106 {
00107   if ( !GUIActivateEvent::test( ev ) ||
00108       !watched->inherits("KParts::ReadOnlyPart")  )
00109       return QObject::eventFilter(watched, ev);
00110 
00111   KStatusBar * sb = statusBar();
00112   if ( !sb )
00113       return QObject::eventFilter(watched, ev);
00114 
00115   GUIActivateEvent *gae = static_cast<GUIActivateEvent*>(ev);
00116 
00117   if ( gae->activated() )
00118   {
00119     QValueListIterator<StatusBarItem> it = m_statusBarItems.begin();
00120     for ( ; it != m_statusBarItems.end() ; ++it )
00121       (*it).ensureItemShown( sb );
00122   }
00123   else
00124   {
00125     QValueListIterator<StatusBarItem> it = m_statusBarItems.begin();
00126     for ( ; it != m_statusBarItems.end() ; ++it )
00127       (*it).ensureItemHidden( sb );
00128   }
00129 
00130   return false;
00131 
00132 }
00133 
00134 KStatusBar * StatusBarExtension::statusBar() const
00135 {
00136   if ( !m_statusBar )  {
00137     QWidget* w = static_cast<KParts::ReadOnlyPart*>(parent())->widget();
00138     KMainWindow* mw = dynamic_cast<KMainWindow *>( w->topLevelWidget() );
00139     if ( mw )
00140       m_statusBar = mw->statusBar();
00141   }
00142   return m_statusBar;
00143 }
00144 
00145 void StatusBarExtension::setStatusBar( KStatusBar* status )
00146 {
00147   m_statusBar = status;
00148 }
00149 
00150 void StatusBarExtension::addStatusBarItem( QWidget * widget, int stretch, bool permanent )
00151 {
00152   m_statusBarItems.append( StatusBarItem( widget, stretch, permanent ) );
00153   QValueListIterator<StatusBarItem> it = m_statusBarItems.fromLast();
00154   KStatusBar * sb = statusBar();
00155   Q_ASSERT(sb);
00156   if (sb)
00157     (*it).ensureItemShown( sb );
00158 }
00159 
00160 void StatusBarExtension::removeStatusBarItem( QWidget * widget )
00161 {
00162   KStatusBar * sb = statusBar();
00163   QValueListIterator<StatusBarItem> it = m_statusBarItems.begin();
00164   for ( ; it != m_statusBarItems.end() ; ++it )
00165     if ( (*it).widget() == widget )
00166     {
00167       if ( sb )
00168         (*it).ensureItemHidden( sb );
00169       m_statusBarItems.remove( it );
00170       break;
00171     }
00172   if ( it == m_statusBarItems.end() )
00173     kdWarning(1000) << "StatusBarExtension::removeStatusBarItem. Widget not found : " << widget << endl;
00174 }
00175 
00176 #include "statusbarextension.moc"
00177 
00178 // vim: ts=2 sw=2 et
KParts

statusbarextension.cpp

KParts

API Reference
