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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/qcolorspace.h>
61#include <QtGui/qcursor.h>
62#include <QtGui/qimage.h>
63#include <QtGui/qwindowdefs.h>
64#include <qpa/qplatformpixmap.h>
65
66QT_BEGIN_NAMESPACE
67
68
69class QPlatformBackingStore;
70class QPlatformScreenPrivate;
71class QPlatformWindow;
72class QPlatformCursor;
73class QScreen;
74class QSurfaceFormat;
75
76typedef QPair<qreal, qreal> QDpi;
77
78
79class Q_GUI_EXPORT QPlatformScreen
80{
81 Q_DECLARE_PRIVATE(QPlatformScreen)
82
83public:
84 Q_DISABLE_COPY_MOVE(QPlatformScreen)
85
86 enum SubpixelAntialiasingType { // copied from qfontengine_p.h since we can't include private headers
87 Subpixel_None,
88 Subpixel_RGB,
89 Subpixel_BGR,
90 Subpixel_VRGB,
91 Subpixel_VBGR
92 };
93
94 enum PowerState {
95 PowerStateOn,
96 PowerStateStandby,
97 PowerStateSuspend,
98 PowerStateOff
99 };
100
101 struct Mode {
102 QSize size;
103 qreal refreshRate;
104 };
105
106 QPlatformScreen();
107 virtual ~QPlatformScreen();
108
109 virtual bool isPlaceholder() const { return false; }
110
111 virtual QPixmap grabWindow(WId window, int x, int y, int width, int height) const;
112
113 virtual QRect geometry() const = 0;
114 virtual QRect availableGeometry() const {return geometry();}
115
116 virtual int depth() const = 0;
117 virtual QImage::Format format() const = 0;
118 virtual QColorSpace colorSpace() const { return QColorSpace::SRgb; }
119
120 virtual QSizeF physicalSize() const;
121 virtual QDpi logicalDpi() const;
122 virtual QDpi logicalBaseDpi() const;
123 virtual qreal devicePixelRatio() const;
124
125 virtual qreal refreshRate() const;
126
127 virtual Qt::ScreenOrientation nativeOrientation() const;
128 virtual Qt::ScreenOrientation orientation() const;
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 QList<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