Implement alertion state for windows.

Add QWindow::alert() and QPlatformWindow::setAlertState().
Add logic to clear alertion state when the window becomes
active. The platform plugins then only need to implement a setter
and a cheap getter and need not handle activation.

Prototypically implement X11 and Windows.

Task-number: QTBUG-30416
Change-Id: Ia70c4722d812462a21f4034b7d52735c9f2bc49c
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>

4 files changed, 35 insertions, 2 deletions

diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index 9b2b67619d..2a5e08cf41 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -1802,6 +1802,19 @@ QWindowsWindow *QWindowsWindow::childAt(const QPoint &clientPoint, unsigned cwex
 }
 
 #ifndef Q_OS_WINCE
+void QWindowsWindow::setAlertState(bool enabled)
+{
+    if (isAlertState() == enabled)
+        return;
+    if (enabled) {
+        alertWindow(0);
+        setFlag(AlertState);
+    } else {
+        stopAlertWindow();
+        clearFlag(AlertState);
+    }
+}
+
 void QWindowsWindow::alertWindow(int durationMs)
 {
     DWORD timeOutMs = GetCaretBlinkTime();
diff --git a/src/plugins/platforms/windows/qwindowswindow.h b/src/plugins/platforms/windows/qwindowswindow.h
index 1148440f05..2117ca50b8 100644
--- a/src/plugins/platforms/windows/qwindowswindow.h
+++ b/src/plugins/platforms/windows/qwindowswindow.h
@@ -132,7 +132,8 @@ public:
         SynchronousGeometryChangeEvent = 0x400,
         WithinSetStyle = 0x800,
         WithinDestroy = 0x1000,
-        TouchRegistered = 0x2000
+        TouchRegistered = 0x2000,
+        AlertState = 0x4000
     };
 
     struct WindowData
@@ -255,6 +256,8 @@ public:
     void setWindowIcon(const QIcon &icon);
 
 #ifndef Q_OS_WINCE
+    void setAlertState(bool enabled);
+    bool isAlertState() const { return testFlag(AlertState); }
     void alertWindow(int durationMs = 0);
     void stopAlertWindow();
 #endif
diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index 5af6a9ec9d..68ccbfb8c0 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -189,6 +189,7 @@ QXcbWindow::QXcbWindow(QWindow *window)
     , m_usingSyncProtocol(false)
     , m_deferredActivation(false)
     , m_embedded(false)
+    , m_alertState(false)
     , m_netWmUserTimeWindow(XCB_NONE)
     , m_dirtyFrameMargins(false)
 #if defined(XCB_USE_EGL)
@@ -2047,4 +2048,17 @@ void QXcbWindow::setMask(const QRegion &region)
 
 #endif // !QT_NO_SHAPE
 
+void QXcbWindow::setAlertState(bool enabled)
+{
+    if (m_alertState == enabled)
+        return;
+    const NetWmStates oldState = netWmStates();
+    m_alertState = enabled;
+    if (enabled) {
+        setNetWmStates(oldState | NetWmStateDemandsAttention);
+    } else {
+        setNetWmStates(oldState & ~NetWmStateDemandsAttention);
+    }
+}
+
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/xcb/qxcbwindow.h b/src/plugins/platforms/xcb/qxcbwindow.h
index f4bd2d96ff..300596845e 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.h
+++ b/src/plugins/platforms/xcb/qxcbwindow.h
@@ -56,7 +56,6 @@ QT_BEGIN_NAMESPACE
 class QXcbScreen;
 class QXcbEGLSurface;
 class QIcon;
-
 class QXcbWindow : public QXcbObject, public QPlatformWindow
 {
 public:
@@ -120,6 +119,9 @@ public:
     void setMask(const QRegion &region);
 #endif // !QT_NO_SHAPE
 
+    void setAlertState(bool enabled);
+    bool isAlertState() const { return m_alertState; }
+
     xcb_window_t xcb_window() const { return m_window; }
     uint depth() const { return m_depth; }
     QImage::Format imageFormat() const { return m_imageFormat; }
@@ -194,6 +196,7 @@ private:
     bool m_deferredExpose;
     bool m_configureNotifyPending;
     bool m_embedded;
+    bool m_alertState;
     xcb_window_t m_netWmUserTimeWindow;
 
     QSurfaceFormat m_format;