Qt 4.8
qpaintengine_p.h
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41 
42 #ifndef QPAINTENGINE_P_H
43 #define QPAINTENGINE_P_H
44 
45 //
46 // W A R N I N G
47 // -------------
48 //
49 // This file is not part of the Qt API. It exists for the convenience
50 // of other Qt classes. This header file may change from version to
51 // version without notice, or even be removed.
52 //
53 // We mean it.
54 //
55 
56 #include "QtGui/qpainter.h"
57 #include "QtGui/qpaintengine.h"
58 #include "QtGui/qregion.h"
59 #include "private/qobject_p.h"
60 
62 
63 class QPaintDevice;
64 
66 {
68 public:
70  hasSystemViewport(0) {}
71  virtual ~QPaintEnginePrivate() { }
81 
82  inline void transformSystemClip()
83  {
84  if (systemClip.isEmpty())
85  return;
86 
87  if (hasSystemTransform) {
88  if (systemTransform.type() <= QTransform::TxTranslate)
89  systemClip.translate(qRound(systemTransform.dx()), qRound(systemTransform.dy()));
90  else
91  systemClip = systemTransform.map(systemClip);
92  }
93 
94  // Make sure we're inside the viewport.
95  if (hasSystemViewport) {
96  systemClip &= systemViewport;
97  if (systemClip.isEmpty()) {
98  // We don't want to paint without system clip, so set it to 1 pixel :)
99  systemClip = QRect(systemViewport.boundingRect().topLeft(), QSize(1, 1));
100  }
101  }
102  }
103 
104  inline void setSystemTransform(const QTransform &xform)
105  {
106  systemTransform = xform;
107  if ((hasSystemTransform = !xform.isIdentity()) || hasSystemViewport)
110  }
111 
112  inline void setSystemViewport(const QRegion &region)
113  {
114  systemViewport = region;
115  hasSystemViewport = !systemViewport.isEmpty();
116  }
117 
118  virtual void systemStateChanged() { }
119 
120  void drawBoxTextItem(const QPointF &p, const QTextItemInt &ti);
121 };
122 
124 
125 #endif // QPAINTENGINE_P_H
void setSystemViewport(const QRegion &region)
qreal dy() const
Returns the vertical translation factor.
Definition: qtransform.h:277
#define QT_END_NAMESPACE
This macro expands to.
Definition: qglobal.h:90
void setSystemTransform(const QTransform &xform)
The QPointF class defines a point in the plane using floating point precision.
Definition: qpoint.h:214
The QWidget class is the base class of all user interface objects.
Definition: qwidget.h:150
QRect boundingRect() const
Returns the bounding rectangle of this region.
Definition: qregion.cpp:4363
TransformationType type() const
Returns the transformation type of this matrix.
bool isIdentity() const
Returns true if the matrix is the identity matrix, otherwise returns false.
Definition: qtransform.h:204
#define QT_BEGIN_NAMESPACE
This macro expands to.
Definition: qglobal.h:89
bool isEmpty() const
Returns true if the region is empty; otherwise returns false.
Definition: qregion.cpp:4098
QPoint map(const QPoint &p) const
Creates and returns a QPoint object that is a copy of the given point, mapped into the coordinate sys...
Internal QTextItem.
unsigned int uint
Definition: qglobal.h:996
The QRegion class specifies a clip region for a painter.
Definition: qregion.h:68
QTransform systemTransform
The QPaintEngine class provides an abstract definition of how QPainter draws to a given device on a g...
Definition: qpaintengine.h:90
virtual ~QPaintEnginePrivate()
virtual void systemStateChanged()
#define Q_DECLARE_PUBLIC(Class)
Definition: qglobal.h:2477
The QRect class defines a rectangle in the plane using integer precision.
Definition: qrect.h:58
qreal dx() const
Returns the horizontal translation factor.
Definition: qtransform.h:273
QPaintDevice * pdev
void translate(int dx, int dy)
Translates (moves) the region dx along the X axis and dy along the Y axis.
Definition: qregion.cpp:4116
The QSize class defines the size of a two-dimensional object using integer point precision.
Definition: qsize.h:53
void drawBoxTextItem(const QPointF &p, const QTextItemInt &ti)
Q_DECL_CONSTEXPR int qRound(qreal d)
Definition: qglobal.h:1203
QWidget * currentClipWidget
The QTransform class specifies 2D transformations of a coordinate system.
Definition: qtransform.h:65
QPoint topLeft() const
Returns the position of the rectangle&#39;s top-left corner.
Definition: qrect.h:288
QPaintEngine * q_ptr