libkdepim/uistatesaver.cpp

   1 /*
   2     Copyright (c) 2008 Volker Krause <vkrause@kde.org>
   3
   4     This library is free software; you can redistribute it and/or modify it
   5     under the terms of the GNU Library General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or (at your
   7     option) any later version.
   8
   9     This library is distributed in the hope that it will be useful, but WITHOUT
  10     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
  12     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 the
  16     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17     02110-1301, USA.
  18 */
  19
  20 #include "uistatesaver.h"
  21
  22 #include <KConfigGroup>
  23
  24 #include <QtGui/QComboBox>
  25 #include <QtGui/QHeaderView>
  26 #include <QtGui/QSplitter>
  27 #include <QtGui/QTabWidget>
  28 #include <QtGui/QTreeView>
  29
  30 using namespace KPIM;
  31
  32 struct Saver {
  33   static void process( QSplitter *splitter, KConfigGroup &config )
  34   {
  35     if ( splitter->sizes().count( 0 ) == splitter->sizes().count() )
  36       return;
  37     config.writeEntry( splitter->objectName(), splitter->sizes() );
  38   }
  39
  40   static void process( QTabWidget *tab, KConfigGroup &config )
  41   {
  42     config.writeEntry( tab->objectName(), tab->currentIndex() );
  43   }
  44
  45   static void process( QTreeView *tv, KConfigGroup &config )
  46   {
  47     config.writeEntry( tv->objectName(), tv->header()->saveState() );
  48   }
  49
  50   static void process( QComboBox *cb, KConfigGroup &config )
  51   {
  52     config.writeEntry( cb->objectName(), cb->currentIndex() );
  53   }
  54 };
  55
  56 struct Restorer {
  57   static void process( QSplitter *splitter, const KConfigGroup &config )
  58   {
  59     const QList<int> sizes = config.readEntry( splitter->objectName(), QList<int>() );
  60     if ( !sizes.isEmpty() && splitter->count() == sizes.count() && sizes.count() != sizes.count( 0 ) )
  61       splitter->setSizes( sizes );
  62   }
  63
  64   static void process( QTabWidget *tab, const KConfigGroup &config )
  65   {
  66     const int index = config.readEntry( tab->objectName(), -1 );
  67     if ( index >= 0 && index < tab->count() )
  68       tab->setCurrentIndex( index );
  69   }
  70
  71   static void process( QTreeView *tv, const KConfigGroup &config )
  72   {
  73     const QByteArray state = config.readEntry( tv->objectName(), QByteArray() );
  74     if ( !state.isEmpty() )
  75       tv->header()->restoreState( state );
  76   }
  77
  78   static void process( QComboBox *cb, const KConfigGroup &config )
  79   {
  80     const int index = config.readEntry( cb->objectName(), -1 );
  81     if ( index >= 0 && index < cb->count() )
  82       cb->setCurrentIndex( index );
  83   }
  84 };
  85
  86 #define PROCESS_TYPE( T ) \
  87 { \
  88   T *obj = qobject_cast<T*>( w ); \
  89   if ( obj ) { \
  90     Op::process( obj, config ); \
  91     continue; \
  92   } \
  93 }
  94
  95 template <typename Op, typename Config> static void processWidgets( QWidget *widget, Config config )
  96 {
  97   QList<QWidget*> widgets = widget->findChildren<QWidget*>();
  98   widgets << widget;
  99   foreach ( QWidget* w, widgets ) {
 100     if ( w->objectName().isEmpty() )
 101       continue;
 102     PROCESS_TYPE( QSplitter );
 103     PROCESS_TYPE( QTabWidget );
 104     PROCESS_TYPE( QTreeView );
 105     PROCESS_TYPE( QComboBox );
 106   }
 107 }
 108
 109 #undef PROCESS_TYPE
 110
 111 void UiStateSaver::saveState(QWidget * widget, KConfigGroup & config)
 112 {
 113   processWidgets<Saver, KConfigGroup&>( widget, config );
 114 }
 115
 116 void UiStateSaver::restoreState(QWidget * widget, const KConfigGroup & config)
 117 {
 118   processWidgets<Restorer, const KConfigGroup&>( widget, config );
 119 }