transactionthread.h

Qt4的一些例子

#ifndef TRANSACTIONTHREAD_H
#define TRANSACTIONTHREAD_H

#include <QImage>
#include <QMutex>
#include <QThread>
#include <QQueue>

class Transaction
{
public:
    virtual ~Transaction() { }

    virtual QImage apply(const QImage &image) = 0;
    virtual QString message() = 0;
};

class FlipTransaction : public Transaction
{
public:
    FlipTransaction(Qt::Orientation orientation);

    QImage apply(const QImage &image);
    QString message();

private:
    Qt::Orientation orientation;
};

class ResizeTransaction : public Transaction
{
public:
    ResizeTransaction(const QSize &size);

    QImage apply(const QImage &image);
    QString message();

private:
    QSize size;
};

class ConvertDepthTransaction : public Transaction
{
public:
    ConvertDepthTransaction(int depth);

    QImage apply(const QImage &image);
    QString message();

private:
    int depth;
};

class TransactionThread : public QThread
{
    Q_OBJECT

public:
    void addTransaction(Transaction *transact);
    void setImage(const QImage &image);
    QImage image();

signals:
    void transactionStarted(const QString &message);

protected:
    void run();

private:
    QMutex mutex;
    QImage currentImage;
    QQueue<Transaction *> transactions;
};

#endif