memory.cpp

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/**********************************************************************
** Copyright (C) 2000 Trolltech AS.  All rights reserved.
**
** This file is part of Qtopia Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact [e-mail] if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/

#include <qlabel.h>
#include <qtimer.h>
#include <qfile.h>
#include <qtextstream.h>
#include <qlayout.h>
#include <qwhatsthis.h>
#include "graph.h"
#include "memory.h"
QString ChineseAndEnglish(const char*ChineseString);
MemoryInfo::MemoryInfo( QWidget *parent, const char *name, WFlags f )
    : QWidget( parent, name, f )
{
    QVBoxLayout *vb = new QVBoxLayout( this, 5 );

    totalMem = new QLabel( this );
    vb->addWidget( totalMem );

    data = new GraphData();
    graph = new BarGraph( this );
    graph->setFrameStyle( QFrame::Panel | QFrame::Sunken );
    vb->addWidget( graph, 1 );
    graph->setData( data );

    legend = new GraphLegend( this );
    vb->addWidget( legend );
    legend->setData( data );

    swapMem = new QLabel( this );
    vb->addWidget( swapMem );

    swapdata = new GraphData();
    swapgraph = new BarGraph( this );
    swapgraph->setFrameStyle( QFrame::Panel | QFrame::Sunken );
    vb->addWidget( swapgraph, 1 );
    swapgraph->setData( swapdata );

    swaplegend = new GraphLegend( this );
    vb->addWidget( swaplegend );
    swaplegend->setData( swapdata );

    vb->addStretch( 1 );
    updateData();

    QTimer *t = new QTimer( this );
    connect( t, SIGNAL( timeout() ), this, SLOT( updateData() ) );
    t->start( 5000 );

    QWhatsThis::add( this, tr( "This page shows how memory (i.e. RAM) is being allocated on your device.\nMemory is categorized as follows:\n\n1. Used - memory used to by Opie and any running applications.\n2. Buffers - temporary storage used to improve performance\n3. Cached - information that has recently been used, but has not been freed yet.\n4. Free - memory not currently used by Opie or any running applications." ) );

}

MemoryInfo::~MemoryInfo()
{
    delete data;
}

void MemoryInfo::updateData()
{
    QFile file( "/proc/meminfo" );

    if ( file.open( IO_ReadOnly ) )
    {
        QTextStream t( &file );
        QString dummy = t.readLine();   // title
        t >> dummy;
        t >> total;
        total /= 1024;
        t >> used;
        used /= 1024;
        t >> memfree;
        memfree /= 1024;
        t >> shared;
        shared /= 1024;
        t >> buffers;
        buffers /= 1024;
        t >> cached;
        cached /= 1024;
        realUsed = total - ( buffers + cached + memfree );

        totalMem->setText(ChineseAndEnglish("总内存: %1 kB" ).arg( total ) );
        data->clear();
        data->addItem(ChineseAndEnglish("使用(%1 kB)").arg(realUsed), realUsed );
        data->addItem(ChineseAndEnglish("高速缓存(%1 kB)").arg(buffers), buffers );
        data->addItem(ChineseAndEnglish("缓存 (%1 kB)").arg(cached), cached );
        data->addItem(ChineseAndEnglish("空闲 (%1 kB)").arg(memfree), memfree );

        graph->hide();
        graph->show();
        legend->update();

        // swapfile
        t >> dummy;
        t >> swaptotal;
        swaptotal /= 1024;
        t >> swapused;
        swapused /= 1024;
        t >> swapfree;
        swapfree /= 1024;

        if (swaptotal > 0)
        {
            swapMem->setText(ChineseAndEnglish("总虚拟内存: %1 kB" ).arg( swaptotal ) );
            swapdata->clear();
            swapdata->addItem(ChineseAndEnglish("使用 (%1 kB)").arg(swapused), swapused );
            swapdata->addItem(ChineseAndEnglish("空闲 (%1 kB)").arg(swapfree), swapfree );

            swapMem->show();
            swapgraph->show();
            swaplegend->show();

            swapgraph->repaint( FALSE );
            swaplegend->update();
        }
        else
        {
            swapMem->hide();
            swapgraph->hide();
            swaplegend->hide();
        }
    }
}