APIs for lighthouse plugins to declare screen changes

These APIs provide a method for lighthouse plugins to intiate delivery
of the QDesktopWidget signals: resized, screenCountChanged, and
workAreaResized.

The handleScreenGeometryChange and handleScreenAvailableGeometryChange
functions also resize fullscreen and maximized toplevel widgets.

4 files changed, 67 insertions, 0 deletions

diff --git a/src/gui/kernel/qapplication_lite.cpp b/src/gui/kernel/qapplication_lite.cpp
index 491dd02..6008a9f 100644
--- a/src/gui/kernel/qapplication_lite.cpp
+++ b/src/gui/kernel/qapplication_lite.cpp
@@ -828,4 +828,48 @@ void QApplicationPrivate::processTouchEvent(QWindowSystemInterface::TouchEvent *
     translateRawTouchEvent(e->widget.data(), e->devType, touchPoints);
 }
 
+void QApplicationPrivate::reportScreenCount(int count)
+{
+    // signal anything listening for creation or deletion of screens
+    QDesktopWidget *desktop = QApplication::desktop();
+    if (desktop)
+        emit desktop->screenCountChanged(count);
+}
+
+void QApplicationPrivate::reportGeometryChange(int screenIndex)
+{
+    // signal anything listening for screen geometry changes
+    QDesktopWidget *desktop = QApplication::desktop();
+    if (desktop)
+        emit desktop->resized(screenIndex);
+
+    // make sure maximized and fullscreen windows are updated
+    QWidgetList list = QApplication::topLevelWidgets();
+    for (int i = list.size() - 1; i >= 0; --i) {
+        QWidget *w = list.at(i);
+        if (w->isFullScreen())
+            w->d_func()->setFullScreenSize_helper();
+        else if (w->isMaximized())
+            w->d_func()->setMaxWindowState_helper();
+    }
+}
+
+void QApplicationPrivate::reportAvailableGeometryChange(int screenIndex)
+{
+    // signal anything listening for screen geometry changes
+    QDesktopWidget *desktop = QApplication::desktop();
+    if (desktop)
+        emit desktop->workAreaResized(screenIndex);
+
+    // make sure maximized and fullscreen windows are updated
+    QWidgetList list = QApplication::topLevelWidgets();
+    for (int i = list.size() - 1; i >= 0; --i) {
+        QWidget *w = list.at(i);
+        if (w->isFullScreen())
+            w->d_func()->setFullScreenSize_helper();
+        else if (w->isMaximized())
+            w->d_func()->setMaxWindowState_helper();
+    }
+}
+
 QT_END_NAMESPACE
diff --git a/src/gui/kernel/qapplication_p.h b/src/gui/kernel/qapplication_p.h
index f06826d..e272a36 100644
--- a/src/gui/kernel/qapplication_p.h
+++ b/src/gui/kernel/qapplication_p.h
@@ -496,6 +496,10 @@ public:
 
     static void processUserEvent(QWindowSystemInterface::UserEvent *e);
 
+    static void reportScreenCount(int count);
+    static void reportGeometryChange(int screenIndex);
+    static void reportAvailableGeometryChange(int screenIndex);
+
 #endif
 
 #ifdef Q_WS_QWS
diff --git a/src/gui/kernel/qwindowsysteminterface.cpp b/src/gui/kernel/qwindowsysteminterface.cpp
index 102d1a3..cd466e3 100644
--- a/src/gui/kernel/qwindowsysteminterface.cpp
+++ b/src/gui/kernel/qwindowsysteminterface.cpp
@@ -142,4 +142,19 @@ void QWindowSystemInterface::handleTouchEvent(QWidget *tlw, ulong timestamp, QEv
     QWindowSystemInterfacePrivate::queueUserEvent(e);
 }
 
+void QWindowSystemInterface::handleScreenGeometryChange(int screenIndex)
+{
+    QApplicationPrivate::reportGeometryChange(screenIndex);
+}
+
+void QWindowSystemInterface::handleScreenAvailableGeometryChange(int screenIndex)
+{
+    QApplicationPrivate::reportAvailableGeometryChange(screenIndex);
+}
+
+void QWindowSystemInterface::handleScreenCountChange(int count)
+{
+    QApplicationPrivate::reportScreenCount(count);
+}
+
 QT_END_NAMESPACE
diff --git a/src/gui/kernel/qwindowsysteminterface.h b/src/gui/kernel/qwindowsysteminterface.h
index efb515f..8c69218 100644
--- a/src/gui/kernel/qwindowsysteminterface.h
+++ b/src/gui/kernel/qwindowsysteminterface.h
@@ -97,6 +97,10 @@ public:
     static void handleEnterEvent(QWidget *w);
     static void handleLeaveEvent(QWidget *w);
 
+    // Changes to the screen
+    static void handleScreenGeometryChange(int screenIndex);
+    static void handleScreenAvailableGeometryChange(int screenIndex);
+    static void handleScreenCountChange(int count);
 
     class UserEvent {
     public: