libkdepim/overlaywidget.cpp

   1 /** -*- c++ -*-
   2  * overlaywidget.h
   3  *
   4  *  Copyright (c) 2004 David Faure <faure@kde.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; version 2 of the License
   9  *
  10  *  This program 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
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  *
  19  *  In addition, as a special exception, the copyright holders give
  20  *  permission to link the code of this program with any edition of
  21  *  the Qt library by Trolltech AS, Norway (or with modified versions
  22  *  of Qt that use the same license as Qt), and distribute linked
  23  *  combinations including the two.  You must obey the GNU General
  24  *  Public License in all respects for all of the code used other than
  25  *  Qt.  If you modify this file, you may extend this exception to
  26  *  your version of the file, but you are not obligated to do so.  If
  27  *  you do not wish to do so, delete this exception statement from
  28  *  your version.
  29  */
  30
  31 #include "overlaywidget.h"
  32 #include <QResizeEvent>
  33 #include <QEvent>
  34
  35 using namespace KPIM;
  36
  37 OverlayWidget::OverlayWidget( QWidget* alignWidget, QWidget* parent, const char* name )
  38   : KHBox( parent ), mAlignWidget( 0 )
  39 {
  40   setObjectName(name);
  41   setAlignWidget( alignWidget );
  42 }
  43
  44 OverlayWidget::~OverlayWidget()
  45 {
  46 }
  47
  48 void OverlayWidget::reposition()
  49 {
  50   if ( !mAlignWidget )
  51     return;
  52   // p is in the alignWidget's coordinates
  53   QPoint p;
  54   // We are always above the alignWidget, right-aligned with it.
  55   p.setX( mAlignWidget->width() - width() );
  56   p.setY( -height() );
  57   // Position in the toplevelwidget's coordinates
  58   QPoint pTopLevel = mAlignWidget->mapTo( topLevelWidget(), p );
  59   // Position in the widget's parentWidget coordinates
  60   QPoint pParent = parentWidget()->mapFrom( topLevelWidget(), pTopLevel );
  61   // Move 'this' to that position.
  62   move( pParent );
  63 }
  64
  65 void OverlayWidget::setAlignWidget( QWidget * w )
  66 {
  67   if (w == mAlignWidget)
  68     return;
  69
  70   if (mAlignWidget)
  71     mAlignWidget->removeEventFilter(this);
  72
  73   mAlignWidget = w;
  74
  75   if (mAlignWidget)
  76     mAlignWidget->installEventFilter(this);
  77
  78   reposition();
  79 }
  80
  81 bool OverlayWidget::eventFilter( QObject* o, QEvent* e)
  82 {
  83   if ( o == mAlignWidget &&
  84        ( e->type() == QEvent::Move || e->type() == QEvent::Resize ) ) {
  85     reposition();
  86   }
  87   return QFrame::eventFilter(o,e);
  88 }
  89
  90 void OverlayWidget::resizeEvent( QResizeEvent* ev )
  91 {
  92   reposition();
  93   QFrame::resizeEvent( ev );
  94 }
  95
  96 #include "overlaywidget.moc"