HippoDraw Class Library

Paint buffer for Qwt widgets. More...

#include <qwt_paint_buffer.h>

Collaboration diagram for QwtPaintBuffer:

Collaboration graph

[legend]

Public Member Functions
void	close ()

const QPaintDevice *	device ()

void	open (QPaintDevice , const QRect &, QPainter painter=NULL)

QPainter *	painter ()

	QwtPaintBuffer ()
	Default constructor. More...

	QwtPaintBuffer (QPaintDevice , const QRect &, QPainter painter=NULL)

virtual	~QwtPaintBuffer ()

Static Public Member Functions
static bool	isEnabled ()

static void	setEnabled (bool enable)

Protected Member Functions
void	flush ()

Private Attributes
QPaintDevice *	d_device

QPainter *	d_devicePainter

QPainter *	d_painter

QPixmap	d_pixBuffer

QRect	d_rect

Static Private Attributes
static bool	d_enabled = TRUE

Detailed Description

Paint buffer for Qwt widgets.

QwtPaintBuffer offers a simple way to en/disable double buffering. Double buffering is enabled as default and in general there will be no reason to change this.

Definition at line 38 of file qwt_paint_buffer.h.

Constructor & Destructor Documentation

◆ QwtPaintBuffer() [1/2]

QwtPaintBuffer ( )

Default constructor.

Definition at line 42 of file qwt_paint_buffer.cpp.

◆ QwtPaintBuffer() [2/2]

QwtPaintBuffer	(	QPaintDevice *	device,
		const QRect &	rect,
		QPainter *	painter = `NULL`
	)

Create an open paint buffer

Parameters

device	Device to paint on
rect	Rect to paint on
painter	Painter to paint on device. In case of 0 QwtPaintBuffer uses an internal painter

See also: QwtPaintBuffer::open()

Definition at line 59 of file qwt_paint_buffer.cpp.

References QwtPaintBuffer::open().

◆ ~QwtPaintBuffer()

~QwtPaintBuffer ( )

virtual

Closes the buffer

See also: QwtPaintBuffer::close()

Definition at line 72 of file qwt_paint_buffer.cpp.

References QwtPaintBuffer::close().

Member Function Documentation

◆ close()

void close ( )

Flush the internal pixmap buffer to the device and close the buffer.

Definition at line 209 of file qwt_paint_buffer.cpp.

References QwtPaintBuffer::d_device, QwtPaintBuffer::d_devicePainter, QwtPaintBuffer::d_painter, QwtPaintBuffer::d_pixBuffer, QPainter::end(), QwtPaintBuffer::flush(), QPainter::isActive(), and QPixmap::isNull().

Referenced by QwtPaintBuffer::open(), and QwtPaintBuffer::~QwtPaintBuffer().

◆ device()

const QPaintDevice * device ( )

Returns: Device to paint on

Definition at line 91 of file qwt_paint_buffer.cpp.

References QwtPaintBuffer::d_device.

Referenced by QwtPaintBuffer::flush(), and QwtPaintBuffer::open().

◆ flush()

void flush ( )

protected

Flush the internal pixmap buffer to the device.

Definition at line 176 of file qwt_paint_buffer.cpp.

References QwtPaintBuffer::d_device, QwtPaintBuffer::d_devicePainter, QwtPaintBuffer::d_enabled, QwtPaintBuffer::d_pixBuffer, QwtPaintBuffer::d_rect, QPainter::device(), QwtPaintBuffer::device(), QPainter::drawPixmap(), QPaintDevice::isExtDev(), QRect::isValid(), QRect::topLeft(), and num_util::type().

Referenced by QwtPaintBuffer::close().

◆ isEnabled()

bool isEnabled ( )

static

Returns: TRUE if double buffering is enabled, FALSE otherwise.

Definition at line 109 of file qwt_paint_buffer.cpp.

References QwtPaintBuffer::d_enabled.

Referenced by QwtPaintBuffer::open().

◆ open()

void open	(	QPaintDevice *	device,
		const QRect &	rect,
		QPainter *	painter = `NULL`
	)

Open the buffer

Parameters

device	Device to paint on
rect	Rect to paint on
painter	Painter to paint on device. In case of 0 QwtPaintBuffer uses an internal painter

Definition at line 122 of file qwt_paint_buffer.cpp.

References QPainter::begin(), QwtPaintBuffer::close(), QwtPaintBuffer::d_device, QwtPaintBuffer::d_devicePainter, QwtPaintBuffer::d_painter, QwtPaintBuffer::d_pixBuffer, QwtPaintBuffer::d_rect, QwtPaintBuffer::device(), QPainter::eraseRect(), QPixmap::fill(), QwtPaintBuffer::isEnabled(), QRect::isValid(), QwtPaintBuffer::painter(), QPixmap::resize(), QRect::size(), QWidget::testWFlags(), QRect::topLeft(), QPainter::translate(), QRect::x(), and QRect::y().

Referenced by QwtPaintBuffer::QwtPaintBuffer().

◆ painter()

QPainter * painter ( )

Returns: Depending on isEnabled() the painter connected to an internal pixmap buffer otherwise the painter connected to the device.

Definition at line 83 of file qwt_paint_buffer.cpp.

References QwtPaintBuffer::d_painter.

Referenced by QwtPaintBuffer::open(), and QtViewWidget::paintEvent().

◆ setEnabled()

void setEnabled ( bool enable )

static

Enable/Disable double buffering. Please note that this is a global switch for all QwtPaintBuffers, but won't change opened buffers.

Definition at line 101 of file qwt_paint_buffer.cpp.

References QwtPaintBuffer::d_enabled.

Member Data Documentation

◆ d_device

QPaintDevice* d_device

private

Definition at line 62 of file qwt_paint_buffer.h.

Referenced by QwtPaintBuffer::close(), QwtPaintBuffer::device(), QwtPaintBuffer::flush(), and QwtPaintBuffer::open().

◆ d_devicePainter

QPainter* d_devicePainter

private

Definition at line 64 of file qwt_paint_buffer.h.

Referenced by QwtPaintBuffer::close(), QwtPaintBuffer::flush(), and QwtPaintBuffer::open().

◆ d_enabled

bool d_enabled = TRUE

staticprivate

Definition at line 66 of file qwt_paint_buffer.h.

Referenced by QwtPaintBuffer::flush(), QwtPaintBuffer::isEnabled(), and QwtPaintBuffer::setEnabled().

◆ d_painter

QPainter* d_painter

private

Definition at line 63 of file qwt_paint_buffer.h.

Referenced by QwtPaintBuffer::close(), QwtPaintBuffer::open(), and QwtPaintBuffer::painter().

◆ d_pixBuffer

QPixmap d_pixBuffer

private

Definition at line 59 of file qwt_paint_buffer.h.

Referenced by QwtPaintBuffer::close(), QwtPaintBuffer::flush(), and QwtPaintBuffer::open().

◆ d_rect

QRect d_rect

private

Definition at line 60 of file qwt_paint_buffer.h.

Referenced by QwtPaintBuffer::flush(), and QwtPaintBuffer::open().

The documentation for this class was generated from the following files:

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