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39
40#ifndef QPLATFORMSCREEN_H
41#define QPLATFORMSCREEN_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is part of the QPA API and is not meant to be used
48// in applications. Usage of this API may make your code
49// source and binary incompatible with future versions of Qt.
50//
51
52#include <QtGui/qtguiglobal.h>
53#include <QtCore/qmetatype.h>
54#include <QtCore/qnamespace.h>
55#include <QtCore/qcoreevent.h>
56#include <QtCore/qvariant.h>
57#include <QtCore/qrect.h>
58#include <QtCore/qobject.h>
59
60#include <QtGui/qcursor.h>
61#include <QtGui/qimage.h>
62#include <QtGui/qwindowdefs.h>
63#include <qpa/qplatformpixmap.h>
64
65QT_BEGIN_NAMESPACE
66
67
68class QPlatformBackingStore;
69class QPlatformScreenPrivate;
70class QPlatformWindow;
71class QPlatformCursor;
72class QScreen;
73class QSurfaceFormat;
74
75typedef QPair<qreal, qreal> QDpi;
76
77
78class Q_GUI_EXPORT QPlatformScreen
79{
80 Q_DECLARE_PRIVATE(QPlatformScreen)
81
82public:
83 Q_DISABLE_COPY_MOVE(QPlatformScreen)
84
85 enum SubpixelAntialiasingType { // copied from qfontengine_p.h since we can't include private headers
86 Subpixel_None,
87 Subpixel_RGB,
88 Subpixel_BGR,
89 Subpixel_VRGB,
90 Subpixel_VBGR
91 };
92
93 enum PowerState {
94 PowerStateOn,
95 PowerStateStandby,
96 PowerStateSuspend,
97 PowerStateOff
98 };
99
100 struct Mode {
101 QSize size;
102 qreal refreshRate;
103 };
104
105 QPlatformScreen();
106 virtual ~QPlatformScreen();
107
108 virtual bool isPlaceholder() const { return false; }
109
110 virtual QPixmap grabWindow(WId window, int x, int y, int width, int height) const;
111
112 virtual QRect geometry() const = 0;
113 virtual QRect availableGeometry() const {return geometry();}
114
115 virtual int depth() const = 0;
116 virtual QImage::Format format() const = 0;
117
118 virtual QSizeF physicalSize() const;
119 virtual QDpi logicalDpi() const;
120 virtual QDpi logicalBaseDpi() const;
121 virtual qreal devicePixelRatio() const;
122 virtual qreal pixelDensity() const;
123
124 virtual qreal refreshRate() const;
125
126 virtual Qt::ScreenOrientation nativeOrientation() const;
127 virtual Qt::ScreenOrientation orientation() const;
128 virtual void setOrientationUpdateMask(Qt::ScreenOrientations mask);
129
130 virtual QWindow *topLevelAt(const QPoint &point) const;
131 QWindowList windows() const;
132
133 virtual QList<QPlatformScreen *> virtualSiblings() const;
134 const QPlatformScreen *screenForPosition(const QPoint &point) const;
135
136 QScreen *screen() const;
137
138 //jl: should this function be in QPlatformIntegration
139 //jl: maybe screenForWindow is a better name?
140 static QPlatformScreen *platformScreenForWindow(const QWindow *window);
141
142 virtual QString name() const { return QString(); }
143
144 virtual QString manufacturer() const;
145 virtual QString model() const;
146 virtual QString serialNumber() const;
147
148 virtual QPlatformCursor *cursor() const;
149 virtual SubpixelAntialiasingType subpixelAntialiasingTypeHint() const;
150
151 virtual PowerState powerState() const;
152 virtual void setPowerState(PowerState state);
153
154 virtual QVector<Mode> modes() const;
155
156 virtual int currentMode() const;
157 virtual int preferredMode() const;
158
159 static int angleBetween(Qt::ScreenOrientation a, Qt::ScreenOrientation b);
160 static QTransform transformBetween(Qt::ScreenOrientation a, Qt::ScreenOrientation b, const QRect &target);
161 static QRect mapBetween(Qt::ScreenOrientation a, Qt::ScreenOrientation b, const QRect &rect);
162
163 // The platform screen's geometry in device independent coordinates
164 QRect deviceIndependentGeometry() const;
165
166 static QDpi overrideDpi(const QDpi &in);
167
168protected:
169 void resizeMaximizedWindows();
170
171 QScopedPointer<QPlatformScreenPrivate> d_ptr;
172
173private:
174 friend class QScreenPrivate;
175};
176
177// Qt doesn't currently support running with no platform screen
178// QPA plugins can use this class to create a fake screen
179class Q_GUI_EXPORT QPlatformPlaceholderScreen : public QPlatformScreen {
180public:
181 // virtualSibling can be passed in to make the placeholder a sibling with other screens during
182 // the transitioning phase when the real screen is about to be removed, or the first real screen
183 // is about to be added. This is useful because Qt will currently recreate (but now show!)
184 // windows when they are moved from one virtual desktop to another, so if the last monitor is
185 // unplugged, then plugged in again, windows will be hidden unless the placeholder belongs to
186 // the same virtual desktop as the other screens.
187 QPlatformPlaceholderScreen(bool virtualSibling = true) : m_virtualSibling(virtualSibling) {}
188 bool isPlaceholder() const override { return true; }
189 QRect geometry() const override { return QRect(); }
190 QRect availableGeometry() const override { return QRect(); }
191 int depth() const override { return 32; }
192 QImage::Format format() const override { return QImage::Format::Format_RGB32; }
193 QList<QPlatformScreen *> virtualSiblings() const override;
194private:
195 bool m_virtualSibling = true;
196};
197
198QT_END_NAMESPACE
199
200#endif // QPLATFORMSCREEN_H
201

source code of qtbase/src/gui/kernel/qplatformscreen.h