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# QPrintPreviewDialog Class Reference
[QtGui module]

The QPrintPreviewDialog class provides a dialog for previewing and configuring page layouts for printer output. More...

     #include <QPrintPreviewDialog>

Inherits QDialog.

This class was introduced in Qt 4.4.

- List of all members, including inherited members

### Public Functions

- QPrintPreviewDialog ( QPrinter * printer, QWidget * parent = 0, Qt::WindowFlags flags = 0 )
- QPrintPreviewDialog ( QWidget * parent = 0, Qt::WindowFlags flags = 0 )
- ~QPrintPreviewDialog ()

- 5 public functions inherited from QDialog
- 206 public functions inherited from QWidget
- 29 public functions inherited from QObject
- 12 public functions inherited from QPaintDevice

### Signals

- void paintRequested ( QPrinter * printer )

- 3 signals inherited from QDialog
- 1 signal inherited from QWidget
- 1 signal inherited from QObject

### Additional Inherited Members

- 2 properties inherited from QDialog
- 57 properties inherited from QWidget
- 1 property inherited from QObject
- 4 public slots inherited from QDialog
- 19 public slots inherited from QWidget
- 1 public slot inherited from QObject
- 4 static public members inherited from QWidget
- 5 static public members inherited from QObject
- 38 protected functions inherited from QWidget
- 7 protected functions inherited from QObject
- 1 protected function inherited from QPaintDevice
- 1 protected slot inherited from QWidget

## Detailed Description

The QPrintPreviewDialog class provides a dialog for previewing and configuring page layouts for printer output.

Using QPrintPreviewDialog in your existing application is straightforward:

1. Create the QPrintPreviewDialog.

   You can construct a QPrintPreviewDialog with an existing QPrinter object, or you can have QPrintPreviewDialog create one for you, which will be the system default printer.

2. Connect the paintRequested() signal to a slot.

   When the dialog needs to generate a set of preview pages, the paintRequested() signal will be emitted. You can use the exact same code for the actual printing as for having the preview generated, including calling QPrinter::newPage() to start a new page in the preview. Connect a slot to the paintRequested() signal, where you draw onto the QPrinter object that is passed into the slot.

3. Call exec().

   Call QPrintPreviewDialog::exec() to show the preview dialog.

See also QPrinter, QPrintDialog, QPageSetupDialog, and QPrintPreviewWidget.

## Member Function Documentation

### QPrintPreviewDialog::QPrintPreviewDialog ( QPrinter * printer, QWidget * parent = 0, Qt::WindowFlags flags = 0 )

Constructs a QPrintPreviewDialog based on printer and with parent as the parent widget. The widget flags flags are passed on to the QWidget constructor.

See also QWidget::setWindowFlags().

### QPrintPreviewDialog::QPrintPreviewDialog ( QWidget * parent = 0, Qt::WindowFlags flags = 0 )

This will create an internal QPrinter object, which will use the system default printer.

### QPrintPreviewDialog::~QPrintPreviewDialog ()

Destroys the QPrintPreviewDialog.

### void QPrintPreviewDialog::paintRequested ( QPrinter * printer ) `[signal]`

This signal is emitted when the QPrintPreviewDialog needs to generate a set of preview pages.

The printer instance supplied is the paint device onto which you should paint the contents of each page, using the QPrinter instance in the same way as you would when printing directly.