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39
40#ifndef QGRAPHICSEFFECT_H
41#define QGRAPHICSEFFECT_H
42
43#include <QtWidgets/qtwidgetsglobal.h>
44#include <QtCore/qobject.h>
45#include <QtCore/qpoint.h>
46#include <QtCore/qrect.h>
47#include <QtGui/qcolor.h>
48#include <QtGui/qbrush.h>
49
50QT_REQUIRE_CONFIG(graphicseffect);
51
52QT_BEGIN_NAMESPACE
53
54class QGraphicsItem;
55class QStyleOption;
56class QPainter;
57class QPixmap;
58
59class QGraphicsEffectSource;
60
61class QGraphicsEffectPrivate;
62class Q_WIDGETS_EXPORT QGraphicsEffect : public QObject
63{
64 Q_OBJECT
65 Q_PROPERTY(bool enabled READ isEnabled WRITE setEnabled NOTIFY enabledChanged)
66public:
67 enum ChangeFlag {
68 SourceAttached = 0x1,
69 SourceDetached = 0x2,
70 SourceBoundingRectChanged = 0x4,
71 SourceInvalidated = 0x8
72 };
73 Q_DECLARE_FLAGS(ChangeFlags, ChangeFlag)
74 Q_FLAG(ChangeFlags)
75
76 enum PixmapPadMode {
77 NoPad,
78 PadToTransparentBorder,
79 PadToEffectiveBoundingRect
80 };
81
82 QGraphicsEffect(QObject *parent = nullptr);
83 virtual ~QGraphicsEffect();
84
85 virtual QRectF boundingRectFor(const QRectF &sourceRect) const;
86 QRectF boundingRect() const;
87
88 bool isEnabled() const;
89
90public Q_SLOTS:
91 void setEnabled(bool enable);
92 void update();
93
94Q_SIGNALS:
95 void enabledChanged(bool enabled);
96
97protected:
98 QGraphicsEffect(QGraphicsEffectPrivate &d, QObject *parent = nullptr);
99 virtual void draw(QPainter *painter) = 0;
100 virtual void sourceChanged(ChangeFlags flags);
101 void updateBoundingRect();
102
103 bool sourceIsPixmap() const;
104 QRectF sourceBoundingRect(Qt::CoordinateSystem system = Qt::LogicalCoordinates) const;
105 void drawSource(QPainter *painter);
106 QPixmap sourcePixmap(Qt::CoordinateSystem system = Qt::LogicalCoordinates,
107 QPoint *offset = nullptr,
108 PixmapPadMode mode = PadToEffectiveBoundingRect) const;
109
110private:
111 Q_DECLARE_PRIVATE(QGraphicsEffect)
112 Q_DISABLE_COPY(QGraphicsEffect)
113 friend class QGraphicsItem;
114 friend class QGraphicsItemPrivate;
115 friend class QGraphicsScenePrivate;
116 friend class QWidget;
117 friend class QWidgetPrivate;
118
119public:
120 QGraphicsEffectSource *source() const; // internal
121
122};
123Q_DECLARE_OPERATORS_FOR_FLAGS(QGraphicsEffect::ChangeFlags)
124
125class QGraphicsColorizeEffectPrivate;
126class Q_WIDGETS_EXPORT QGraphicsColorizeEffect: public QGraphicsEffect
127{
128 Q_OBJECT
129 Q_PROPERTY(QColor color READ color WRITE setColor NOTIFY colorChanged)
130 Q_PROPERTY(qreal strength READ strength WRITE setStrength NOTIFY strengthChanged)
131public:
132 QGraphicsColorizeEffect(QObject *parent = nullptr);
133 ~QGraphicsColorizeEffect();
134
135 QColor color() const;
136 qreal strength() const;
137
138public Q_SLOTS:
139 void setColor(const QColor &c);
140 void setStrength(qreal strength);
141
142Q_SIGNALS:
143 void colorChanged(const QColor &color);
144 void strengthChanged(qreal strength);
145
146protected:
147 void draw(QPainter *painter) override;
148
149private:
150 Q_DECLARE_PRIVATE(QGraphicsColorizeEffect)
151 Q_DISABLE_COPY(QGraphicsColorizeEffect)
152};
153
154class QGraphicsBlurEffectPrivate;
155class Q_WIDGETS_EXPORT QGraphicsBlurEffect: public QGraphicsEffect
156{
157 Q_OBJECT
158 Q_PROPERTY(qreal blurRadius READ blurRadius WRITE setBlurRadius NOTIFY blurRadiusChanged)
159 Q_PROPERTY(BlurHints blurHints READ blurHints WRITE setBlurHints NOTIFY blurHintsChanged)
160public:
161 enum BlurHint {
162 PerformanceHint = 0x00,
163 QualityHint = 0x01,
164 AnimationHint = 0x02
165 };
166 Q_FLAG(BlurHint)
167 Q_DECLARE_FLAGS(BlurHints, BlurHint)
168 Q_FLAG(BlurHints)
169
170 QGraphicsBlurEffect(QObject *parent = nullptr);
171 ~QGraphicsBlurEffect();
172
173 QRectF boundingRectFor(const QRectF &rect) const override;
174 qreal blurRadius() const;
175 BlurHints blurHints() const;
176
177public Q_SLOTS:
178 void setBlurRadius(qreal blurRadius);
179 void setBlurHints(BlurHints hints);
180
181Q_SIGNALS:
182 void blurRadiusChanged(qreal blurRadius);
183 void blurHintsChanged(BlurHints hints);
184
185protected:
186 void draw(QPainter *painter) override;
187
188private:
189 Q_DECLARE_PRIVATE(QGraphicsBlurEffect)
190 Q_DISABLE_COPY(QGraphicsBlurEffect)
191};
192
193Q_DECLARE_OPERATORS_FOR_FLAGS(QGraphicsBlurEffect::BlurHints)
194
195class QGraphicsDropShadowEffectPrivate;
196class Q_WIDGETS_EXPORT QGraphicsDropShadowEffect: public QGraphicsEffect
197{
198 Q_OBJECT
199 Q_PROPERTY(QPointF offset READ offset WRITE setOffset NOTIFY offsetChanged)
200 Q_PROPERTY(qreal xOffset READ xOffset WRITE setXOffset NOTIFY offsetChanged)
201 Q_PROPERTY(qreal yOffset READ yOffset WRITE setYOffset NOTIFY offsetChanged)
202 Q_PROPERTY(qreal blurRadius READ blurRadius WRITE setBlurRadius NOTIFY blurRadiusChanged)
203 Q_PROPERTY(QColor color READ color WRITE setColor NOTIFY colorChanged)
204public:
205 QGraphicsDropShadowEffect(QObject *parent = nullptr);
206 ~QGraphicsDropShadowEffect();
207
208 QRectF boundingRectFor(const QRectF &rect) const override;
209 QPointF offset() const;
210
211 inline qreal xOffset() const
212 { return offset().x(); }
213
214 inline qreal yOffset() const
215 { return offset().y(); }
216
217 qreal blurRadius() const;
218 QColor color() const;
219
220public Q_SLOTS:
221 void setOffset(const QPointF &ofs);
222
223 inline void setOffset(qreal dx, qreal dy)
224 { setOffset(QPointF(dx, dy)); }
225
226 inline void setOffset(qreal d)
227 { setOffset(QPointF(d, d)); }
228
229 inline void setXOffset(qreal dx)
230 { setOffset(QPointF(dx, yOffset())); }
231
232 inline void setYOffset(qreal dy)
233 { setOffset(QPointF(xOffset(), dy)); }
234
235 void setBlurRadius(qreal blurRadius);
236 void setColor(const QColor &color);
237
238Q_SIGNALS:
239 void offsetChanged(const QPointF &offset);
240 void blurRadiusChanged(qreal blurRadius);
241 void colorChanged(const QColor &color);
242
243protected:
244 void draw(QPainter *painter) override;
245
246private:
247 Q_DECLARE_PRIVATE(QGraphicsDropShadowEffect)
248 Q_DISABLE_COPY(QGraphicsDropShadowEffect)
249};
250
251class QGraphicsOpacityEffectPrivate;
252class Q_WIDGETS_EXPORT QGraphicsOpacityEffect: public QGraphicsEffect
253{
254 Q_OBJECT
255 Q_PROPERTY(qreal opacity READ opacity WRITE setOpacity NOTIFY opacityChanged)
256 Q_PROPERTY(QBrush opacityMask READ opacityMask WRITE setOpacityMask NOTIFY opacityMaskChanged)
257public:
258 QGraphicsOpacityEffect(QObject *parent = nullptr);
259 ~QGraphicsOpacityEffect();
260
261 qreal opacity() const;
262 QBrush opacityMask() const;
263
264public Q_SLOTS:
265 void setOpacity(qreal opacity);
266 void setOpacityMask(const QBrush &mask);
267
268Q_SIGNALS:
269 void opacityChanged(qreal opacity);
270 void opacityMaskChanged(const QBrush &mask);
271
272protected:
273 void draw(QPainter *painter) override;
274
275private:
276 Q_DECLARE_PRIVATE(QGraphicsOpacityEffect)
277 Q_DISABLE_COPY(QGraphicsOpacityEffect)
278};
279
280QT_END_NAMESPACE
281
282#endif // QGRAPHICSEFFECT_H
283
284

source code of qtbase/src/widgets/effects/qgraphicseffect.h