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39
40#include "qsvgwidget.h"
41
42#ifndef QT_NO_WIDGETS
43
44#include "qsvgrenderer.h"
45
46#include "qstyleoption.h"
47#include "qpainter.h"
48#include "private/qwidget_p.h"
49
50QT_BEGIN_NAMESPACE
51
52/*!
53 \class QSvgWidget
54 \inmodule QtSvg
55 \ingroup painting
56
57 \brief The QSvgWidget class provides a widget that is used to display the contents of
58 Scalable Vector Graphics (SVG) files.
59 \since 4.1
60
61 This class enables developers to display SVG drawings alongside standard widgets, and
62 is used in much the same way as QLabel is used for displaying text and bitmap images.
63
64 Since QSvgWidget is a subclass of QWidget, SVG drawings are rendered using the properties
65 of the display. More control can be exercised over the rendering process with the
66 QSvgRenderer class, as this can be used to paint onto other paint devices, such as QImage
67 and QGLWidget. The renderer used by the widget can be obtained with the renderer()
68 function.
69
70 Each QSvgWidget can be constructed with the file name of a SVG file, or they can be
71 constructed without a specific file to render and one can be supplied later. The load()
72 functions provide two different ways to load an SVG file: they accept either the file name
73 of an SVG file or a QByteArray containing the serialized XML representation of an SVG file.
74
75 By default, the widget provides a size hint to reflect the size of the drawing that it
76 displays. If no data has been loaded, the widget provides the default QWidget size hint.
77 Subclass this class and reimplement sizeHint() if you need to customize this behavior.
78
79 \sa QSvgRenderer, {Qt SVG C++ Classes}, QPicture
80*/
81
82class QSvgWidgetPrivate : public QWidgetPrivate
83{
84 Q_DECLARE_PUBLIC(QSvgWidget)
85public:
86 QSvgRenderer *renderer;
87};
88
89/*!
90 Constructs a new SVG display widget with the given \a parent.
91*/
92QSvgWidget::QSvgWidget(QWidget *parent)
93 : QWidget(*new QSvgWidgetPrivate, parent, {})
94{
95 d_func()->renderer = new QSvgRenderer(this);
96 QObject::connect(sender: d_func()->renderer, SIGNAL(repaintNeeded()),
97 receiver: this, SLOT(update()));
98}
99
100/*!
101 Constructs a new SVG display widget with the given \a parent and loads the contents
102 of the specified \a file.
103*/
104QSvgWidget::QSvgWidget(const QString &file, QWidget *parent)
105 : QWidget(*new QSvgWidgetPrivate, parent, {})
106{
107 d_func()->renderer = new QSvgRenderer(file, this);
108 QObject::connect(sender: d_func()->renderer, SIGNAL(repaintNeeded()),
109 receiver: this, SLOT(update()));
110}
111
112/*!
113 Destroys the widget.
114*/
115QSvgWidget::~QSvgWidget()
116{
117
118}
119
120/*!
121 Returns the renderer used to display the contents of the widget.
122*/
123QSvgRenderer * QSvgWidget::renderer() const
124{
125 Q_D(const QSvgWidget);
126 return d->renderer;
127}
128
129
130/*!
131 \reimp
132*/
133QSize QSvgWidget::sizeHint() const
134{
135 Q_D(const QSvgWidget);
136 if (d->renderer->isValid())
137 return d->renderer->defaultSize();
138 else
139 return QSize(128, 64);
140}
141
142
143/*!
144 \reimp
145*/
146void QSvgWidget::paintEvent(QPaintEvent *)
147{
148 Q_D(QSvgWidget);
149 QStyleOption opt;
150 opt.init(w: this);
151 QPainter p(this);
152 style()->drawPrimitive(pe: QStyle::PE_Widget, opt: &opt, p: &p, w: this);
153 d->renderer->render(p: &p);
154}
155
156/*!
157 Loads the contents of the specified SVG \a file and updates the widget.
158*/
159void QSvgWidget::load(const QString &file)
160{
161 Q_D(const QSvgWidget);
162 d->renderer->load(filename: file);
163}
164
165/*!
166 Loads the specified SVG format \a contents and updates the widget.
167*/
168void QSvgWidget::load(const QByteArray &contents)
169{
170 Q_D(const QSvgWidget);
171 d->renderer->load(contents);
172}
173
174QT_END_NAMESPACE
175
176#endif // QT_NO_WIDGETS
177

source code of qtsvg/src/svg/qsvgwidget.cpp