Using Maemo 5 thumbnails

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Overview[edit | edit source]

Template:Abstract

Basic Idea[edit | edit source]

Maemo 5 has Tracker search engine running, which is responsible for a thumbnail creation. Thumbnails are stored in $HOME/.thumbnails/cropped on Maemo 5 platform and $HOME/.thumbnails/normal

That's all about theory, now we are going to create QDirModel to get list of the files, QListView to show the files and custom class derived from QAbstractItemDelegate to draw thumbnails in the item view.

main.cpp:

  1. include <QApplication>
  2. include <QDirModel>
  3. include <QListView>
  4. include <QDebug>
  1. include "filedelegate.h"

int main (int argc, char **argv) {

   QApplication app(argc, argv);
   QDirModel model;
   FileDelegate delegate;
   QListView view;
   view.setModel(&model);
   view.setViewMode(QListView::IconMode);
   view.setResizeMode(QListView::Adjust);
  1. ifdef Q_WS_MAEMO_5
   view.setRootIndex(model.index(QDir::homePath() + "/.thumbnails/cropped"));
  1. else
   view.setRootIndex(model.index(QDir::homePath() + "/.thumbnails/normal"));
  1. endif
   view.setItemDelegate(&delegate);
   view.show();
   return app.exec();

}

Class Declaration[edit | edit source]

filedelegate.h

  1. ifndef FILEDELEGATE_H
  2. define FILEDELEGATE_H
  1. include <QItemDelegate>

class FileDelegate : public QAbstractItemDelegate {

   Q_OBJECT

public:

   FileDelegate(QObject *parent = 0);
   void paint(QPainter *painter, const QStyleOptionViewItem &option,
              const QModelIndex &index) const;
   QSize sizeHint(const QStyleOptionViewItem &option,
                  const QModelIndex &index ) const;

};

  1. endif

Class Implementation[edit | edit source]

filedelegate.cpp:

  1. include <QDirModel>
  2. include <QPainter>
  3. include <QDebug>
  1. include "filedelegate.h"

FileDelegate::FileDelegate(QObject *parent)

   : QAbstractItemDelegate(parent)

{ }

void FileDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,

                         const QModelIndex &index) const

{

   const QDirModel *model = qobject_cast<const QDirModel *>(index.model());
   QPixmap pixmap(model->filePath(index));
   painter->drawPixmap(option.rect, pixmap);

}

QSize FileDelegate::sizeHint(const QStyleOptionViewItem &option,

                             const QModelIndex &index) const

{

   Q_UNUSED(option);
   const QDirModel *model = qobject_cast<const QDirModel *>(index.model());
   QImage image(model->filePath(index));
   return image.size();

}