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-rw-r--r--src/gui/kernel/qplatformscreen.h23
1 files changed, 23 insertions, 0 deletions
diff --git a/src/gui/kernel/qplatformscreen.h b/src/gui/kernel/qplatformscreen.h
index d7378aed51..0be7646032 100644
--- a/src/gui/kernel/qplatformscreen.h
+++ b/src/gui/kernel/qplatformscreen.h
@@ -105,6 +105,8 @@ public:
QPlatformScreen();
virtual ~QPlatformScreen();
+ virtual bool isPlaceholder() const { return false; }
+
virtual QPixmap grabWindow(WId window, int x, int y, int width, int height) const;
virtual QRect geometry() const = 0;
@@ -172,6 +174,27 @@ private:
friend class QScreenPrivate;
};
+// Qt doesn't currently support running with no platform screen
+// QPA plugins can use this class to create a fake screen
+class Q_GUI_EXPORT QPlatformPlaceholderScreen : public QPlatformScreen {
+public:
+ // virtualSibling can be passed in to make the placeholder a sibling with other screens during
+ // the transitioning phase when the real screen is about to be removed, or the first real screen
+ // is about to be added. This is useful because Qt will currently recreate (but now show!)
+ // windows when they are moved from one virtual desktop to another, so if the last monitor is
+ // unplugged, then plugged in again, windows will be hidden unless the placeholder belongs to
+ // the same virtual desktop as the other screens.
+ QPlatformPlaceholderScreen(bool virtualSibling = true) : m_virtualSibling(virtualSibling) {}
+ bool isPlaceholder() const override { return true; }
+ QRect geometry() const override { return QRect(); }
+ QRect availableGeometry() const override { return QRect(); }
+ int depth() const override { return 32; }
+ QImage::Format format() const override { return QImage::Format::Format_RGB32; }
+ QList<QPlatformScreen *> virtualSiblings() const override;
+private:
+ bool m_virtualSibling = true;
+};
+
QT_END_NAMESPACE
#endif // QPLATFORMSCREEN_H