- Qt 5.15
- Qt Print Support
- C++ Classes
- QPrintPreviewDialog
- Qt 5.15.18 Reference Documentation

# QPrintPreviewDialog Class

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

Header: | #include <QPrintPreviewDialog>
qmake: | QT += printsupport
Since: | Qt 4.4

This class was introduced in Qt 4.4.

- List of all members, including inherited members

## Public Functions

| QPrintPreviewDialog(QPrinter *printer, QWidget *parent = nullptr, Qt::WindowFlags flags = Qt::WindowFlags())
| QPrintPreviewDialog(QWidget *parent = nullptr, Qt::WindowFlags flags = Qt::WindowFlags())
virtual | ~QPrintPreviewDialog()
void | open(QObject *receiver, const char *member)
QPrinter * | printer()

## Reimplemented Public Functions

virtual void | done(int result) override
virtual void | setVisible(bool visible) override

## Signals

void | paintRequested(QPrinter *printer)

## Detailed Description

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 = nullptr, Qt::WindowFlags flags = Qt::WindowFlags())

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 = nullptr, Qt::WindowFlags flags = Qt::WindowFlags())

This is an overloaded function.

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

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

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.

### `[virtual]` QPrintPreviewDialog::~QPrintPreviewDialog()

Destroys the QPrintPreviewDialog.

### `[override virtual]` void QPrintPreviewDialog::done(int result)

### void QPrintPreviewDialog::open(QObject *receiver, const char *member)

This is an overloaded function.

Opens the dialog and connects its finished(int) signal to the slot specified by receiver and member.

The signal will be disconnected from the slot when the dialog is closed.

This function was introduced in Qt 4.5.

### QPrinter *QPrintPreviewDialog::printer()

Returns a pointer to the QPrinter object this dialog is currently operating on.

### `[override virtual]` void QPrintPreviewDialog::setVisible(bool visible)