mediaselector.cpp

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.10平台上编译为嵌入式图形界面操作系统。

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#include <qtopia/qpeapplication.h>
#include <qtopia/applnk.h>
#include <qtopia/storage.h>
#include <qtopia/categoryselect.h>
#include <qtopia/categorydialog.h>
#include <qtopia/resource.h>
#include <qlistview.h>
#include <qmessagebox.h>
#include <qheader.h>

#include "mediaplayerstate.h"
#include "mediaselector.h"
#include "fileinfo.h"

#include <stdlib.h>

#define CHECK_BOX_WIDTH	    14


/*!
  \class MediaSelector mediaselector.h
  \brief This class is specific to the mediaplayer apps.

    It is currently private to those apps, and its API,
    and therefore binary compatibilty may change in later
    versions.

    This class lists MediaSelectorItems. Media items could
    be listed by various media specific attributes, id3 tags or
    other criteria. Phone version only lists the document name
    due to space restrictions.
*/


MediaSelectorItem::MediaSelectorItem( QListView *parent, const DocLnk &f )
    : QCheckListItem( parent, "", QCheckListItem::CheckBox )
{
    setFile( f );
}


const DocLnk &MediaSelectorItem::file() const
{
    return fl;
}


void MediaSelectorItem::setFile( const DocLnk& f )
{
    fl = f;
    setPixmap( 1, f.pixmap() );
    setText( 1, f.name() );
}


QString MediaSelectorItem::key(int column, bool ascending) const
{
    switch ( column ) {
	case 1:
	    return fl.name().lower();
	default:
	    break;
    }
    return QListViewItem::key(column, ascending);
}

/*
static QColor mixColors(const QColor& a, const QColor& b, int pcth)
{
    int pcthb = 100 - pcth;
    return QColor(
	    (a.red() * pcth + b.red() * pcthb) / 100,
	    (a.green() * pcth + b.green() * pcthb) / 100,
	    (a.blue() * pcth + b.blue() * pcthb) / 100);
}
*/

void MediaSelectorItem::paintCell( QPainter *p, const QColorGroup &cg,
                               int column, int width, int align )
{
    QColorGroup mycg(cg);

    if ((itemPos() / height()) & 1) {
	QBrush sb = ((MediaSelector*)listView())->altBrush();
	mycg.setBrush(QColorGroup::Base, sb);
    }

    QCheckListItem::paintCell(p, mycg, column, width, align);
}


QBrush MediaSelector::altBrush() const
{
    return stripebrush;
}


void MediaSelector::paletteChange( const QPalette &p )
{
    //stripebrush = colorGroup().brush(QColorGroup::Background);
    //stripebrush = mixColors(colorGroup().base(), colorGroup().highlight(), 90);
    stripebrush = style().extendedBrush(QStyle::AlternateBase);
    QListView::paletteChange(p);
}


class MediaSelectorData {
    public:
	ContainsCategoryInterface   *catSel;
	QComboBox		    *locSel;
	QList<QListViewItem>	    shuffledList;
	bool			    haveMoved;
	bool			    doingSelection;
	QListViewItem		    *firstItem;
	QListViewItem		    *prevItem;
	int			    firstItemPos;
	int			    prevItemPos;
};


MediaSelector::MediaSelector( QWidget *parent, const char *name )
    : QListView( parent, name )
{
    d = new MediaSelectorData;

    paletteChange(palette());

    d->catSel = 0;
    d->locSel = 0;
    d->haveMoved = true;

    QPEApplication::setStylusOperation( viewport(), QPEApplication::RightOnHold );

    setAllColumnsShowFocus( TRUE );
    setFrameStyle( NoFrame );

    addColumn( tr( "Selected" ) );
    addColumn( tr( "Title" ) );
    header()->hide();

    setColumnAlignment( 0, Qt::AlignCenter );
    setColumnAlignment( 1, Qt::AlignLeft );
    setColumnWidthMode( 0, QListView::Manual );
    setColumnWidthMode( 1, QListView::Manual );
    setColumnWidth( 0, CHECK_BOX_WIDTH );
    setColumnWidth( 1, 105 );

    connect( this, SIGNAL( rightButtonPressed(QListViewItem*,const QPoint&,int) ), this, SLOT( showItemProperties(QListViewItem*) ) );

    clear();

    setSorting( -1 );

    sbVis = FALSE;
}


MediaSelector::~MediaSelector()
{
    delete d;
}


MediaSelectorItem *MediaSelector::newItem( const DocLnk& lnk )
{
    MediaSelectorItem *item = new MediaSelectorItem( this, lnk );
    unsigned int randomPos = (unsigned int)((double)rand() * d->shuffledList.count() / RAND_MAX);
    randomPos = QMIN( randomPos, d->shuffledList.count() );
    d->shuffledList.insert( randomPos, item );
    if ( verticalScrollBar()->isVisible() != sbVis )
	viewportResizeEvent( 0 );
    return item;
}


void MediaSelector::deleteItem( MediaSelectorItem *item )
{
    d->shuffledList.remove( item );
    delete item;
}


// Maximize the 1st column to fill the space left from the next two columns
// Attempt to resize so no horizontal scroll bar is needed. Perhaps need to catch
// other changes like font size changes or style changes to really do this properly,
// but at the very least try to get the desired columns on the screen.
void MediaSelector::viewportResizeEvent( QResizeEvent * )
{
    QScrollBar *sb = verticalScrollBar();
    sbVis = sb->isVisible();
    int sbWidth = sbVis ? sb->width() + 1 : 0;
    setColumnWidth( 1, width() - sbWidth - 4 * lineWidth() - CHECK_BOX_WIDTH);
}


void MediaSelector::showItemProperties( QListViewItem *i )
{
    d->haveMoved = true;
    MediaSelectorItem *item = (MediaSelectorItem *)i;
    if ( item ) {
	MediaFileInfoWidget *infoWidget = new MediaFileInfoWidget( item->file(), this );
	QPEApplication::execDialog( infoWidget );
        delete infoWidget;
    }
}

void MediaSelector::setCategoryFilter( ContainsCategoryInterface *c )
{
    d->catSel = c;
}


void MediaSelector::setLocationFilter( QComboBox *l )
{
    d->locSel = l;
}


bool MediaSelector::filtersMatch( const DocLnk& lnk )
{
    if ( d->catSel && !d->catSel->containsCategoryInterface( lnk.categories() ) )
	return FALSE;
    if ( d->locSel ) {
	StorageInfo storage;
	QString comboLoc = d->locSel->currentText();
        if ( comboLoc == tr( "All Locations" ) )
	    return TRUE;
	const FileSystem *fileSystem = storage.fileSystemOf( lnk.file() );
        if ( fileSystem && comboLoc == fileSystem->name() )
	    return TRUE;
	return FALSE;
    }
    return TRUE;
}


void MediaSelector::removeLink( const DocLnk &lnk )
{
    QListViewItem *prevItem = 0;
    QListViewItem *item = firstChild();
    while ( item ) {
	MediaSelectorItem *i = (MediaSelectorItem *)item;
	DocLnk l = i->file();
	if ( l.name() == lnk.name() && l.file() == lnk.file() ) {
	    deleteItem( i );
	    return;
	}
	prevItem = item;
	item = item->nextSibling();
    }
}


void MediaSelector::changeLink( const DocLnk &oldDoc, const DocLnk &newDoc )
{
    QListViewItem *item = firstChild();
    while ( item ) {
	MediaSelectorItem *i = (MediaSelectorItem *)item;
	DocLnk l = i->file();
	if ( l.name() == oldDoc.name() && l.file() == oldDoc.file() ) {
	    if ( !filtersMatch( newDoc ) ) 
		// The category has been changed to no longer be in the selected category
		deleteItem( i );
	    else 
		i->setFile( newDoc );
	    return;
	}
	item = item->nextSibling();
    }
}


void MediaSelector::addLink( const DocLnk &lnk )
{
    // Ignore if it is not in the category
    if ( !filtersMatch( lnk ) )
	return;
    newItem( lnk );
    // Set selected and current to first in list while adding links
    QListViewItem *first = firstChild();
    if ( first ) {