workspace/kwin/effects/zoom.cpp

   1 /********************************************************************
   2  KWin - the KDE window manager
   3  This file is part of the KDE project.
   4
   5 Copyright (C) 2006 Lubos Lunak <l.lunak@kde.org>
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 *********************************************************************/
  20
  21 #include "zoom.h"
  22
  23 #include <kaction.h>
  24 #include <kactioncollection.h>
  25 #include <kstandardaction.h>
  26
  27 namespace KWin
  28 {
  29
  30 KWIN_EFFECT( zoom, ZoomEffect )
  31
  32 ZoomEffect::ZoomEffect()
  33     : zoom( 1 )
  34     , target_zoom( 1 )
  35     {
  36     KActionCollection* actionCollection = new KActionCollection( this );
  37     KAction* a;
  38     a = static_cast< KAction* >( actionCollection->addAction( KStandardAction::ZoomIn, this, SLOT( zoomIn())));
  39     a->setGlobalShortcut(KShortcut(Qt::META + Qt::Key_Equal));
  40     a = static_cast< KAction* >( actionCollection->addAction( KStandardAction::ZoomOut, this, SLOT( zoomOut())));
  41     a->setGlobalShortcut(KShortcut(Qt::META + Qt::Key_Minus));
  42     a = static_cast< KAction* >( actionCollection->addAction( KStandardAction::ActualSize, this, SLOT( actualSize())));
  43     a->setGlobalShortcut(KShortcut(Qt::META + Qt::Key_0));
  44     }
  45
  46 void ZoomEffect::prePaintScreen( ScreenPrePaintData& data, int time )
  47     {
  48     if( zoom != target_zoom )
  49         {
  50         double diff = time / 500.0;
  51         if( target_zoom > zoom )
  52             zoom = qMin( zoom * qMax( 1 + diff, 1.2 ), target_zoom );
  53         else
  54             zoom = qMax( zoom * qMin( 1 - diff, 0.8 ), target_zoom );
  55         }
  56     if( zoom != 1.0 )
  57         data.mask |= PAINT_SCREEN_TRANSFORMED;
  58     effects->prePaintScreen( data, time );
  59     }
  60
  61 void ZoomEffect::paintScreen( int mask, QRegion region, ScreenPaintData& data )
  62     {
  63     if( zoom != 1.0 )
  64         {
  65         data.xScale *= zoom;
  66         data.yScale *= zoom;
  67         QPoint cursor = cursorPos();
  68         // set the position so that the cursor is in the same position in the scaled view
  69         data.xTranslate = - int( cursor.x() * ( zoom - 1 ));
  70         data.yTranslate = - int( cursor.y() * ( zoom - 1 ));
  71         }
  72     effects->paintScreen( mask, region, data );
  73     }
  74
  75 void ZoomEffect::postPaintScreen()
  76     {
  77     if( zoom != target_zoom )
  78         effects->addRepaintFull();
  79     effects->postPaintScreen();
  80     }
  81
  82 void ZoomEffect::zoomIn()
  83     {
  84     target_zoom *= 1.2;
  85     effects->addRepaintFull();
  86     }
  87
  88 void ZoomEffect::zoomOut()
  89     {
  90     target_zoom /= 1.2;
  91     if( target_zoom < 1 )
  92         target_zoom = 1;
  93     effects->addRepaintFull();
  94     }
  95
  96 void ZoomEffect::actualSize()
  97     {
  98     target_zoom = 1;
  99     effects->addRepaintFull();
 100     }
 101
 102 void ZoomEffect::mouseChanged( const QPoint& pos, const QPoint& old, Qt::MouseButtons,
 103     Qt::MouseButtons, Qt::KeyboardModifiers, Qt::KeyboardModifiers )
 104     {
 105     if( pos != old && zoom != 1 )
 106         effects->addRepaintFull();
 107     }
 108
 109 } // namespace
 110
 111 #include "zoom.moc"