diff options
Diffstat (limited to 'src/gui/kernel')
-rw-r--r-- | src/gui/kernel/qplatformscreen.cpp | 14 | ||||
-rw-r--r-- | src/gui/kernel/qplatformscreen.h | 17 |
2 files changed, 28 insertions, 3 deletions
diff --git a/src/gui/kernel/qplatformscreen.cpp b/src/gui/kernel/qplatformscreen.cpp index 7daf48b191..e511a6f5c4 100644 --- a/src/gui/kernel/qplatformscreen.cpp +++ b/src/gui/kernel/qplatformscreen.cpp @@ -616,4 +616,18 @@ int QPlatformScreen::preferredMode() const return 0; } +QList<QPlatformScreen *> QPlatformPlaceholderScreen::virtualSiblings() const +{ + QList<QPlatformScreen *> siblings; + + if (!m_virtualSibling) + return siblings; + + for (QScreen *screen : QGuiApplication::screens()) { + if (screen->handle() && screen->handle() != this) + siblings << screen->handle(); + } + return siblings; +} + QT_END_NAMESPACE diff --git a/src/gui/kernel/qplatformscreen.h b/src/gui/kernel/qplatformscreen.h index e27355a940..0be7646032 100644 --- a/src/gui/kernel/qplatformscreen.h +++ b/src/gui/kernel/qplatformscreen.h @@ -105,7 +105,7 @@ public: QPlatformScreen(); virtual ~QPlatformScreen(); - virtual bool isPlaceholder() const { return false; }; + virtual bool isPlaceholder() const { return false; } virtual QPixmap grabWindow(WId window, int x, int y, int width, int height) const; @@ -176,12 +176,23 @@ private: // Qt doesn't currently support running with no platform screen // QPA plugins can use this class to create a fake screen -class QPlatformPlaceholderScreen : public QPlatformScreen { - bool isPlaceholder() const override { return true; }; +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 |