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# QPrintPreviewWidget Class Reference
[QtGui module]

The QPrintPreviewWidget class provides a widget for previewing page layouts for printer output. More...

     #include <QPrintPreviewWidget>

Inherits QWidget.

This class was introduced in Qt 4.4.

- List of all members, including inherited members

### Public Types

- enum ViewMode { SinglePageView, FacingPagesView, AllPagesView }
- enum ZoomMode { CustomZoom, FitToWidth, FitInView }

### Public Functions

- QPrintPreviewWidget ( QPrinter * printer, QWidget * parent = 0, Qt::WindowFlags flags = 0 )
- QPrintPreviewWidget ( QWidget * parent = 0, Qt::WindowFlags flags = 0 )
- ~QPrintPreviewWidget ()
- int currentPage () const
- int numPages () const
- QPrinter::Orientation orientation () const
- ViewMode viewMode () const
- qreal zoomFactor () const
- ZoomMode zoomMode () const

- 207 public functions inherited from QWidget
- 29 public functions inherited from QObject
- 14 public functions inherited from QPaintDevice

### Public Slots

- void fitInView ()
- void fitToWidth ()
- void print ()
- void setAllPagesViewMode ()
- void setCurrentPage ( int page )
- void setFacingPagesViewMode ()
- void setLandscapeOrientation ()
- void setOrientation ( QPrinter::Orientation orientation )
- void setPortraitOrientation ()
- void setSinglePageViewMode ()
- void setViewMode ( ViewMode mode )
- void setZoomFactor ( qreal factor )
- void setZoomMode ( ZoomMode zoomMode )
- void updatePreview ()
- void zoomIn ( qreal factor = 1.1 )
- void zoomOut ( qreal factor = 1.1 )

- 19 public slots inherited from QWidget
- 1 public slot inherited from QObject

### Signals

- void paintRequested ( QPrinter * printer )
- void previewChanged ()

- 1 signal inherited from QWidget
- 1 signal inherited from QObject

### Additional Inherited Members

- 57 properties inherited from QWidget
- 1 property inherited from QObject
- 4 static public members inherited from QWidget
- 5 static public members inherited from QObject
- 1 static public member inherited from QPaintDevice
- 37 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 QPrintPreviewWidget class provides a widget for previewing page layouts for printer output.

QPrintPreviewDialog uses a QPrintPreviewWidget internally, and the purpose of QPrintPreviewWidget is to make it possible to embed the preview into other widgets. It also makes it possible to build a different user interface around it than the default one provided with QPrintPreviewDialog.

Using QPrintPreviewWidget is straightforward:

1. Create the QPrintPreviewWidget

   Construct the QPrintPreviewWidget either by passing in an exisiting QPrinter object, or have QPrintPreviewWidget create a default constructed QPrinter object for you.

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

   When the widget needs to generate a set of preview pages, a paintRequested() signal will be emitted from the widget. Connect a slot to this signal, and draw onto the QPrinter passed in as a signal parameter. Call QPrinter::newPage(), to start a new page in the preview.

See also QPrinter, QPrintDialog, QPageSetupDialog, and QPrintPreviewDialog.

## Member Type Documentation

### enum QPrintPreviewWidget::ViewMode

This enum is used to describe the view mode of the preview widget.

Constant | Value | Description
--- | --- | ---
`QPrintPreviewWidget::SinglePageView` | `0` | A mode where single pages in the preview is viewed.
`QPrintPreviewWidget::FacingPagesView` | `1` | A mode where the facing pages in the preview is viewed.
`QPrintPreviewWidget::AllPagesView` | `2` | A view mode where all the pages in the preview is viewed.

### enum QPrintPreviewWidget::ZoomMode

This enum is used to describe zoom mode of the preview widget.

Constant | Value | Description
--- | --- | ---
`QPrintPreviewWidget::CustomZoom` | `0` | The zoom is set to a custom zoom value.
`QPrintPreviewWidget::FitToWidth` | `1` | This mode fits the current page to the width of the view.
`QPrintPreviewWidget::FitInView` | `2` | This mode fits the current page inside the view.

## Member Function Documentation

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

Constructs a QPrintPreviewWidget 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().

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

This is an overloaded member function, provided for convenience.

This will cause QPrintPreviewWidget to create an internal, default constructed QPrinter object, which will be used to generate the preview.

### QPrintPreviewWidget::~QPrintPreviewWidget ()

Destroys the QPrintPreviewWidget.

### int QPrintPreviewWidget::currentPage () const

Returns the currently viewed page in the preview.

See also setCurrentPage().

### void QPrintPreviewWidget::fitInView () `[slot]`

This is a convenience function and is the same as calling `setZoomMode(QPrintPreviewWidget::FitInView)`.

### void QPrintPreviewWidget::fitToWidth () `[slot]`

This is a convenience function and is the same as calling `setZoomMode(QPrintPreviewWidget::FitToWidth)`.

### int QPrintPreviewWidget::numPages () const

Returns the number of pages in the preview.

### QPrinter::Orientation QPrintPreviewWidget::orientation () const

Returns the current orientation of the preview. This value is obtained from the QPrinter object associated with the preview.

See also setOrientation().

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

This signal is emitted when the preview widget needs to generate a set of preview pages. printer is the printer associated with this preview widget.

### void QPrintPreviewWidget::previewChanged () `[signal]`

This signal is emitted whenever the preview widget has changed some internal state, such as the orientation.

### void QPrintPreviewWidget::print () `[slot]`

Prints the preview to the printer associated with the preview.

### void QPrintPreviewWidget::setAllPagesViewMode () `[slot]`

This is a convenience function and is the same as calling `setViewMode(QPrintPreviewWidget::AllPagesView)`.

### void QPrintPreviewWidget::setCurrentPage ( int page ) `[slot]`

Sets the current page in the preview. This will cause the view to skip to the beginning of page.

See also currentPage().

### void QPrintPreviewWidget::setFacingPagesViewMode () `[slot]`

This is a convenience function and is the same as calling `setViewMode(QPrintPreviewWidget::FacingPagesView)`.

### void QPrintPreviewWidget::setLandscapeOrientation () `[slot]`

This is a convenience function and is the same as calling `setOrientation(QPrinter::Landscape)`.

### void QPrintPreviewWidget::setOrientation ( QPrinter::Orientation orientation ) `[slot]`

Sets the current orientation to orientation. This value will be set on the QPrinter object associated with the preview.

See also orientation().

### void QPrintPreviewWidget::setPortraitOrientation () `[slot]`

This is a convenience function and is the same as calling `setOrientation(QPrinter::Portrait)`.

### void QPrintPreviewWidget::setSinglePageViewMode () `[slot]`

This is a convenience function and is the same as calling `setViewMode(QPrintPreviewWidget::SinglePageView)`.

### void QPrintPreviewWidget::setViewMode ( ViewMode mode ) `[slot]`

Sets the view mode to mode. The default view mode is SinglePageView.

See also viewMode().

### void QPrintPreviewWidget::setZoomFactor ( qreal factor ) `[slot]`

Sets the zoom factor of the view to factor. For example, a value of 1.0 indicates an unscaled view, which is approximately the size the view will have on paper. A value of 0.5 will halve the size of the view, while a value of 2.0 will double the size of the view.

See also zoomFactor().

### void QPrintPreviewWidget::setZoomMode ( ZoomMode zoomMode ) `[slot]`

Sets the zoom mode to zoomMode. The default zoom mode is FitInView.

See also zoomMode(), viewMode(), and setViewMode().

### void QPrintPreviewWidget::updatePreview () `[slot]`

This function updates the preview, which causes the paintRequested() signal to be emitted.

### ViewMode QPrintPreviewWidget::viewMode () const

Returns the current view mode. The default view mode is SinglePageView.

See also setViewMode().

### qreal QPrintPreviewWidget::zoomFactor () const

Returns the zoom factor of the view.

See also setZoomFactor().

### void QPrintPreviewWidget::zoomIn ( qreal factor = 1.1 ) `[slot]`

Zooms the current view in by factor. The default value for factor is 1.1, which means the view will be scaled up by 10%.

### ZoomMode QPrintPreviewWidget::zoomMode () const

Returns the current zoom mode.

See also setZoomMode(), viewMode(), and setViewMode().

### void QPrintPreviewWidget::zoomOut ( qreal factor = 1.1 ) `[slot]`

Zooms the current view out by factor. The default value for factor is 1.1, which means the view will be scaled down by 10%.