qwtpaintbuffer.3

linux下qt的第三方的一个类

.TH "QwtPaintBuffer" 3 "16 Nov 2004" "Version 4.2.0" "Qwt User's Guide" \" -*- nroff -*-
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.SH NAME
QwtPaintBuffer \- 
.SH SYNOPSIS
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.PP
.SH "Detailed Description"
.PP 
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. 
.PP
Definition at line 26 of file qwt_paint_buffer.h.
.SS "Public Member Functions"

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.RI "\fBQwtPaintBuffer\fP ()"
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.RI "\fBQwtPaintBuffer\fP (QPaintDevice *, const QRect &, QPainter *p=NULL)"
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.RI "virtual \fB~QwtPaintBuffer\fP ()"
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.RI "void \fBopen\fP (QPaintDevice *, const QRect &, QPainter *p=NULL)"
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.RI "void \fBclose\fP ()"
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.RI "QPainter * \fBpainter\fP ()"
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.RI "const QPaintDevice * \fBdevice\fP ()"
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.RI "const QPixmap & \fBbuffer\fP () const"
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.SS "Static Public Member Functions"

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.RI "void \fBsetEnabled\fP (bool enable)"
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.RI "bool \fBisEnabled\fP ()"
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.SS "Protected Member Functions"

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.RI "void \fBflush\fP ()"
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.SH "Constructor & Destructor Documentation"
.PP 
.SS "QwtPaintBuffer::QwtPaintBuffer ()"
.PP
Default constructor. 
.PP
Definition at line 17 of file qwt_paint_buffer.cpp.
.SS "QwtPaintBuffer::QwtPaintBuffer (QPaintDevice * device, const QRect & rect, QPainter * painter = \fCNULL\fP)"
.PP
Create an open paint buffer 
.PP
\fBParameters:\fP
.RS 4
\fIdevice\fP Device to paint on 
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\fIrect\fP Rect to paint on 
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\fIpainter\fP Painter to paint on device. In case of 0 QwtPaintBuffer uses an internal painter
.RE
.PP
\fBSee also:\fP
.RS 4
\fBQwtPaintBuffer::open()\fP 
.RE
.PP
Definition at line 34 of file qwt_paint_buffer.cpp.
.PP
References open().
.SS "QwtPaintBuffer::~\fBQwtPaintBuffer\fP ()\fC [virtual]\fP"
.PP
Closes the buffer 
.PP
\fBSee also:\fP
.RS 4
\fBQwtPaintBuffer::close()\fP 
.RE
.PP
Definition at line 47 of file qwt_paint_buffer.cpp.
.PP
References close().
.SH "Member Function Documentation"
.PP 
.SS "const QPixmap& QwtPaintBuffer::buffer () const"
.PP
Return Buffer used for double buffering. 
.PP
Definition at line 44 of file qwt_paint_buffer.h.
.PP
Referenced by QwtPlotCanvas::drawCanvas().
.SS "void QwtPaintBuffer::close ()"
.PP
Flush the internal pixmap buffer to the device and close the buffer. Definition at line 178 of file qwt_paint_buffer.cpp.
.PP
References flush().
.PP
Referenced by open(), and ~QwtPaintBuffer().
.SS "const QPaintDevice * QwtPaintBuffer::device ()"
.PP
\fBReturns:\fP
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Device to paint on 
.RE
.PP
Definition at line 66 of file qwt_paint_buffer.cpp.
.PP
Referenced by flush().
.SS "void QwtPaintBuffer::flush ()\fC [protected]\fP"
.PP
Flush the internal pixmap buffer to the device. Definition at line 151 of file qwt_paint_buffer.cpp.
.PP
References device().
.PP
Referenced by close().
.SS "bool QwtPaintBuffer::isEnabled ()\fC [static]\fP"
.PP
\fBReturns:\fP
.RS 4
TRUE if double buffering is enabled, FALSE otherwise. 
.RE
.PP
Definition at line 84 of file qwt_paint_buffer.cpp.
.PP
Referenced by QwtPlotCanvas::drawCanvas(), and open().
.SS "void QwtPaintBuffer::open (QPaintDevice * device, const QRect & rect, QPainter * painter = \fCNULL\fP)"
.PP
Open the buffer 
.PP
\fBParameters:\fP
.RS 4
\fIdevice\fP Device to paint on 
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\fIrect\fP Rect to paint on 
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\fIpainter\fP Painter to paint on device. In case of 0 QwtPaintBuffer uses an internal painter 
.RE
.PP
Definition at line 97 of file qwt_paint_buffer.cpp.
.PP
References close(), and isEnabled().
.PP
Referenced by QwtPaintBuffer().
.SS "QPainter * QwtPaintBuffer::painter ()"
.PP
\fBReturns:\fP
.RS 4
Depending on \fBisEnabled()\fP the painter connected to an internal pixmap buffer otherwise the painter connected to the device. 
.RE
.PP
Definition at line 58 of file qwt_paint_buffer.cpp.
.PP
Referenced by QwtPlotCanvas::drawCanvas(), QwtWheel::paintEvent(), QwtThermo::paintEvent(), QwtSlider::paintEvent(), QwtScale::paintEvent(), QwtKnob::paintEvent(), and QwtDial::paintEvent().
.SS "void QwtPaintBuffer::setEnabled (bool enable)\fC [static]\fP"
.PP
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.

.SH "Author"
.PP 
Generated automatically by Doxygen for Qwt User's Guide from the source code.