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 26 of file qwt_paint_buffer.h.
Public Member Functions | |
QwtPaintBuffer () | |
QwtPaintBuffer (QPaintDevice *, const QRect &, QPainter *p=NULL) | |
virtual | ~QwtPaintBuffer () |
void | open (QPaintDevice *, const QRect &, QPainter *p=NULL) |
void | close () |
QPainter * | painter () |
const QPaintDevice * | device () |
const QPixmap & | buffer () const |
Static Public Member Functions | |
void | setEnabled (bool enable) |
bool | isEnabled () |
Protected Member Functions | |
void | flush () |
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Default constructor. Definition at line 17 of file qwt_paint_buffer.cpp. |
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Create an open paint buffer
References open(). |
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Closes the buffer
References close(). |
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Return Buffer used for double buffering. Definition at line 44 of file qwt_paint_buffer.h. Referenced by QwtPlotCanvas::drawCanvas(). |
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Flush the internal pixmap buffer to the device and close the buffer. Definition at line 178 of file qwt_paint_buffer.cpp. References flush(). Referenced by open(), and ~QwtPaintBuffer(). |
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Referenced by flush(). |
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Flush the internal pixmap buffer to the device. Definition at line 151 of file qwt_paint_buffer.cpp. References device(). Referenced by close(). |
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Referenced by QwtPlotCanvas::drawCanvas(), and open(). |
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Open the buffer
References close(), and isEnabled(). Referenced by QwtPaintBuffer(). |
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Referenced by QwtPlotCanvas::drawCanvas(), QwtWheel::paintEvent(), QwtThermo::paintEvent(), QwtSlider::paintEvent(), QwtScale::paintEvent(), QwtKnob::paintEvent(), and QwtDial::paintEvent(). |
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Enable/Disable double buffering. Please note that this is a global switch for all QwtPaintBuffers, but won't change opened buffers. Definition at line 76 of file qwt_paint_buffer.cpp. |