preview file dialog

[mickey]

I've code this below and works. When I selected (only one click) a fileName in myFileDialog, on the right, in the preview box appear if the file selected is a pixmap or not; I'd like, when I click, show in preview box, the preview of image (the image). How to do? Thanks

class Preview : public QLabel, public QFilePreview {
public:
    Preview( QWidget *parent=0 ) : QLabel( parent ) {}
 
    void previewUrl( const QUrl &u )
    {
        QString path = u.path();
        QPixmap pix( path );
		if ( pix.isNull() ) {			
            setText( "This is not a pixmap" );
		} else {
 
            setText( "This is a pixmap" );
		}
    }
};
 
Preview* p = new Preview;
myFileDialog* myFd = new myFileDialog(this,"",)
myFd->setContentsPreviewEnabled( TRUE );
myFd->setContentsPreview( p, p );
 if ( myFd->exec() == QDialog::Accepted )
        file = myFd->selectedFile();

class Preview : public QLabel, public QFilePreview {
public:
    Preview( QWidget *parent=0 ) : QLabel( parent ) {}

    void previewUrl( const QUrl &u )
    {
        QString path = u.path();
        QPixmap pix( path );
		if ( pix.isNull() ) {			
            setText( "This is not a pixmap" );
		} else {

            setText( "This is a pixmap" );
		}
    }
};

Preview* p = new Preview;
myFileDialog* myFd = new myFileDialog(this,"",)
myFd->setContentsPreviewEnabled( TRUE );
myFd->setContentsPreview( p, p );
 if ( myFd->exec() == QDialog::Accepted )
        file = myFd->selectedFile();

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[jacek]

if ( pix.isNull() ) {         
   setText( "This is not a pixmap" );
} else {
   setPixmap( pix );
}

if ( pix.isNull() ) {         
   setText( "This is not a pixmap" );
} else {
   setPixmap( pix );
}

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[mickey]

Thanks, it works; I'm trying to change it size; with this works, but happen this:

pix.resize(QSize(150,150));

pix.resize(QSize(150,150));

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[Chicken Blood Machine]

read the docs for QPixmap::resize(). It does not resize the image, jsut the size of the pixmap. You will need to create a QImage, scale it with QImage::scale() and create a pixmap from that.

[jacek]

Use this:

void QLabel::setScaledContents ( bool )
Sets whether the label will scale its contents to fill all available space. See the "scaledContents" property for details.

[Chicken Blood Machine]

Use this:

Yes of of course. This is the simpler solution!

[mickey]

thanks, it works; but is it possible repeat more times the same QImage onto a pixmap?

[mickey]

I don't understand how you say me use QLabel for my aim; beyond this, I used pixmap; and I think using qlabel (?) my problem will persists: my image appears distorted (texture 32x32). Am I wrong? (I'd like show it more large, for this I thinked to repeat an QImage on a QPixmap) Thanks

[Chicken Blood Machine]

I don't understand how you say me use QLabel for my aim; beyond this, I used pixmap; and I think using qlabel (?) my problem will persists: my image appears distorted (texture 32x32). Am I wrong? (I'd like show it more large, for this I thinked to repeat an QImage on a QPixmap) Thanks

Ah, the aspect ratio of your image is being distorted. In this case, you should create a QImage and scale it up to the correct size, while retaining the aspect ratio: Something like:

void previewUrl(const QUrl& rUrl)
{
    QString path = rUrl.path();
    QImage im(path);
    if (im.isNull()) 
    {         
        setText( "This is not a pixmap" );
    } 
    else
    {
         im = im.smoothScale(width(), height(), QImage::ScaleMin);
         setPixmap(QPixmap(im));
    }
}

void previewUrl(const QUrl& rUrl)
{
    QString path = rUrl.path();
    QImage im(path);
    if (im.isNull()) 
    {         
        setText( "This is not a pixmap" );
    } 
    else
    {
         im = im.smoothScale(width(), height(), QImage::ScaleMin);
         setPixmap(QPixmap(im));
    }
}

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If you just want to tile the image, use this instead:

void previewUrl(const QUrl& rUrl)
{
    QString path = rUrl.path();
    QPixmap p(path);
    if (p.isNull()) 
    {         
        setText( "This is not a pixmap" );
    } 
    else
    {
         setPaletteBackgroundPixmap(p);
    }
}

void previewUrl(const QUrl& rUrl)
{
    QString path = rUrl.path();
    QPixmap p(path);
    if (p.isNull()) 
    {         
        setText( "This is not a pixmap" );
    } 
    else
    {
         setPaletteBackgroundPixmap(p);
    }
}

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[mickey]

with pallette seems better....but happen this. and when I select a non-pixmap, the preview widget don't change...

[jacek]

with pallette seems better....but happen this. and when I select a non-pixmap, the preview widget don't change...

Because you must restore the original palette.

[mickey]

the very problem isn't that. If I selected a pixmap happen what you see in the pictures....the text isn't clear; and if I put

setText("" );
setPaletteBackgroundPixmap(pix);

setText("" );
setPaletteBackgroundPixmap(pix);

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happen that my background change in a tiny column;