Displaying a picture with PictureWidget

This widget will be called to display a picture at its full size. We also add some buttons to go to the previous/next picture or delete the current one.

Let's start to analyze the PictureWidget.ui form, here is the design view:

Here are the details:

• backButton: Requests to display the gallery
• deleteButton: Removes the picture from the album
• nameLabel: Displays the picture name
• nextButton: Selects the next picture in the album
• previousButton: Selects the previous picture in the album
• pictureLabel: Displays the picture

We can now take a look at the PictureWidget.h header:

#include <QWidget> 
#include <QItemSelection> 
 
namespace Ui { 
class PictureWidget; 
} 
 
class PictureModel; 
class QItemSelectionModel; 
class ThumbnailProxyModel; 
 
class PictureWidget : public QWidget 
{ 
    Q_OBJECT 
 
public: 
    explicit PictureWidget(QWidget *parent = 0); 
    ~PictureWidget(); 
    void setModel(ThumbnailProxyModel* model); 
    void setSelectionModel...