Qt之主窗口设计——打印图像

printimage.h

#ifndef PRINTIMAGE_H
#define PRINTIMAGE_H

#include <QtGui>
#include <QImage>


class PrintImage : public QMainWindow
{
	Q_OBJECT

public:
	PrintImage(QWidget *parent = 0, Qt::WFlags flags = 0);
	~PrintImage();

	void createActions();
	void createMenus();
	void createToolBars();

public slots:
	void sl_print();

private:
	QLabel *labImage;
	QImage image;

	QAction *printAction;
	QMenu *fileMenu;
	QToolBar *fileToolBar;
};

#endif // PRINTIMAGE_H

printimage.cpp

#include "printimage.h"


PrintImage::PrintImage(QWidget *parent, Qt::WFlags flags)
	: QMainWindow(parent, flags)
{
	setWindowTitle(tr("PrintImage"));

	labImage = new QLabel(this);
	labImage->setSizePolicy(QSizePolicy::Ignored,QSizePolicy::Ignored);
	labImage->setScaledContents(true);
	setCentralWidget(labImage);

	createActions();
	createMenus();
	createToolBars();

	if(image.load("tux.png"))
	{
		labImage->setPixmap(QPixmap::fromImage(image));
		resize(image.width(),image.height());
	}
}

PrintImage::~PrintImage()
{

}

void PrintImage::createActions()
{
	printAction = new QAction(QIcon("images/print.png"),tr("Print"),this);
	printAction->setShortcut(tr("Ctrl+P"));
	printAction->setStatusTip(tr("Print Image"));
	connect(printAction,SIGNAL(triggered()),this,SLOT(sl_print()));
}

void PrintImage::createMenus()
{
	fileMenu = menuBar()->addMenu(tr("File"));
	fileMenu->addAction(printAction);
}

void PrintImage::createToolBars()
{
	fileToolBar = addToolBar("File");
	fileToolBar->addAction(printAction);
}

void PrintImage::sl_print()
{
	QPrinter printer;
	QPrintDialog printDlg(&printer,this);
	if(printDlg.exec())
	{
		QPainter painter(&printer);		
		QRect rect = painter.viewport();	
		QSize size = image.size();
		size.scale(rect.size(),Qt::KeepAspectRatio);
		painter.setViewport(rect.x(),rect.y(),size.width(),size.height());
		painter.setWindow(image.rect());
		painter.drawImage(0,0,image);
		
	}
}