172 lines
4.9 KiB
C++
172 lines
4.9 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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#ifndef QWT_PLOT_CANVAS_H
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#define QWT_PLOT_CANVAS_H
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#include "qwt_global.h"
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#include <qframe.h>
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#include <qpainterpath.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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Canvas is the widget where all plot items are displayed
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\sa QwtPlot::setCanvas(), QwtPlotGLCanvas
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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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Q_PROPERTY( double borderRadius READ borderRadius WRITE setBorderRadius )
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public:
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/*!
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\brief Paint attributes
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The default setting enables BackingStore and Opaque.
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\sa setPaintAttribute(), testPaintAttribute()
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*/
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enum PaintAttribute
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{
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/*!
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\brief Paint double buffered reusing the content
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of the pixmap buffer when possible.
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Using a backing store might improve the performance
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significantly, when working with widget overlays ( like rubber bands ).
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Disabling the cache might improve the performance for
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incremental paints (using QwtPlotDirectPainter ).
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\sa backingStore(), invalidateBackingStore()
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*/
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BackingStore = 1,
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/*!
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\brief Try to fill the complete contents rectangle
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of the plot canvas
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When using styled backgrounds Qt assumes, that the
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canvas doesn't fill its area completely
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( f.e because of rounded borders ) and fills the area
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below the canvas. When this is done with gradients it might
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result in a serious performance bottleneck - depending on the size.
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When the Opaque attribute is enabled the canvas tries to
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identify the gaps with some heuristics and to fill those only.
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\warning Will not work for semitransparent backgrounds
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*/
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Opaque = 2,
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/*!
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\brief Try to improve painting of styled backgrounds
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QwtPlotCanvas supports the box model attributes for
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customizing the layout with style sheets. Unfortunately
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the design of Qt style sheets has no concept how to
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handle backgrounds with rounded corners - beside of padding.
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When HackStyledBackground is enabled the plot canvas tries
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to separate the background from the background border
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by reverse engineering to paint the background before and
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the border after the plot items. In this order the border
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gets perfectly antialiased and you can avoid some pixel
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artifacts in the corners.
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*/
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HackStyledBackground = 4,
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/*!
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When ImmediatePaint is set replot() calls repaint()
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instead of update().
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\sa replot(), QWidget::repaint(), QWidget::update()
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*/
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ImmediatePaint = 8
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};
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//! Paint attributes
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typedef QFlags<PaintAttribute> PaintAttributes;
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/*!
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\brief Focus indicator
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The default setting is NoFocusIndicator
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\sa setFocusIndicator(), focusIndicator(), drawFocusIndicator()
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*/
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enum FocusIndicator
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{
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//! Don't paint a focus indicator
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NoFocusIndicator,
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/*!
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The focus is related to the complete canvas.
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Paint the focus indicator using drawFocusIndicator()
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*/
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CanvasFocusIndicator,
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/*!
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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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*/
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ItemFocusIndicator
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};
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explicit QwtPlotCanvas( QwtPlot * = NULL );
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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 setBorderRadius( double );
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double borderRadius() const;
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void setPaintAttribute( PaintAttribute, bool on = true );
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bool testPaintAttribute( PaintAttribute ) const;
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const QPixmap *backingStore() const;
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void invalidateBackingStore();
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virtual bool event( QEvent * );
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Q_INVOKABLE QPainterPath borderPath( const QRect & ) const;
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public Q_SLOTS:
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void replot();
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protected:
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virtual void paintEvent( QPaintEvent * );
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virtual void resizeEvent( QResizeEvent * );
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virtual void drawFocusIndicator( QPainter * );
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virtual void drawBorder( QPainter * );
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void updateStyleSheetInfo();
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private:
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void drawCanvas( QPainter *, bool withBackground );
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class PrivateData;
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PrivateData *d_data;
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};
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Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPlotCanvas::PaintAttributes )
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#endif
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