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120 lines
2.9 KiB
C++
120 lines
2.9 KiB
C++
/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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* Qwt Widget Library
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* Copyright (C) 1997 Josef Wilgen
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* Copyright (C) 2002 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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// vim: expandtab
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#ifndef QWT_PLOT_CANVAS_H
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#define QWT_PLOT_CANVAS_H
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#include <qframe.h>
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#include <qpen.h>
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#include "qwt_global.h"
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class QwtPlot;
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class QPixmap;
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/*!
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\brief Canvas of a QwtPlot.
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\sa QwtPlot
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*/
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class QWT_EXPORT QwtPlotCanvas : public QFrame
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{
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Q_OBJECT
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public:
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/*!
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\brief Paint attributes
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- PaintCached\n
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Paint double buffered and reuse the content of the pixmap buffer
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for some spontaneous repaints that happen when a plot gets unhidden,
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deiconified or changes the focus.
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Disabling the cache will improve the performance for
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incremental paints (using QwtPlotCurve::draw).
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- PaintPacked\n
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Suppress system background repaints and paint it together with
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the canvas contents.
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Painting packed might avoid flickering for expensive repaints,
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when there is a notable gap between painting the background
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and the plot contents.
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The default setting enables PaintCached and PaintPacked
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\sa setPaintAttribute(), testPaintAttribute(), paintCache()
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*/
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enum PaintAttribute
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{
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PaintCached = 1,
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PaintPacked = 2
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};
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/*!
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\brief Focus indicator
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- NoFocusIndicator\n
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Don't paint a focus indicator
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- CanvasFocusIndicator\n
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The focus is related to the complete canvas.
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Paint the focus indicator using paintFocus()
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- ItemFocusIndicator\n
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The focus is related to an item (curve, point, ...) on
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the canvas. It is up to the application to display a
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focus indication using f.e. highlighting.
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\sa setFocusIndicator(), focusIndicator(), paintFocus()
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*/
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enum FocusIndicator
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{
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NoFocusIndicator,
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CanvasFocusIndicator,
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ItemFocusIndicator
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};
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explicit QwtPlotCanvas(QwtPlot *);
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virtual ~QwtPlotCanvas();
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QwtPlot *plot();
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const QwtPlot *plot() const;
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void setFocusIndicator(FocusIndicator);
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FocusIndicator focusIndicator() const;
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void setPaintAttribute(PaintAttribute, bool on = true);
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bool testPaintAttribute(PaintAttribute) const;
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QPixmap *paintCache();
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const QPixmap *paintCache() const;
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void invalidatePaintCache();
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void replot();
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protected:
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virtual void hideEvent(QHideEvent *);
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virtual void paintEvent(QPaintEvent *);
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virtual void drawContents(QPainter *);
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virtual void drawFocusIndicator(QPainter *);
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void drawCanvas(QPainter *painter = NULL);
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private:
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void setSystemBackground(bool);
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class PrivateData;
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PrivateData *d_data;
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};
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#endif
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