Added fullscreen support to softkeys in Symbian.

This commit enables the following two features:

1. Developer can make softkeys visible in fullscreen widget by setting
the Qt::WindowSoftkeysVisibleHint window flag. This flag implememts
intermediate mode for maximized and fullscreen modes. In maximized mode
both statuspane and softkeys are visible, in fullscreen mode with
WindowSoftkeysVisibleHint flag, only the softkeys are visible and
in normal fullscreen mode both statuspane and softkeys are invisible.
This feature was requested by QTBUG-5171.

2. Developer can make softkeys to respond to the key events even the
softkeys are invisible. This means that when widget with
Qt::WindowSoftkeysRespondHint window flag is shown in fullsreen, the
softkey HW key events are routed to invisible softkeys and softkeys
trigger the action associated to pressed softkey button. If the flag
is not set, the key event will be passed to application/focused widget
normally and softkey actions are not triggered. This feature was
requested in QTBUG-4564.

Both new flags are by default off.

In addition, the softkey example is updated to demonstrate the new
window flags. The commit also contains some code style fixes applied by
my editor automatically to changed files.

Task-number: QTBUG-5171
Task-number: QTBUG-4564

Reviewed-by: Jason Barron

3 files changed, 58 insertions, 18 deletions

diff --git a/src/gui/kernel/qapplication_s60.cpp b/src/gui/kernel/qapplication_s60.cpp
index 2eecd56..cf8ce62 100644
--- a/src/gui/kernel/qapplication_s60.cpp
+++ b/src/gui/kernel/qapplication_s60.cpp
@@ -597,9 +597,9 @@ TKeyResponse QSymbianControl::OfferKeyEvent(const TKeyEvent& keyEvent, TEventCod
         TUint s60Keysym = QApplicationPrivate::resolveS60ScanCode(keyEvent.iScanCode,
                 keyEvent.iCode);
         int keyCode;
-		if (s60Keysym == EKeyNull){ //some key events have 0 in iCode, for them iScanCode should be used
-			keyCode = qt_keymapper_private()->mapS60ScanCodesToQt(keyEvent.iScanCode);
-		} else if (s60Keysym >= 0x20 && s60Keysym < ENonCharacterKeyBase) {
+        if (s60Keysym == EKeyNull){ //some key events have 0 in iCode, for them iScanCode should be used
+            keyCode = qt_keymapper_private()->mapS60ScanCodesToQt(keyEvent.iScanCode);
+        } else if (s60Keysym >= 0x20 && s60Keysym < ENonCharacterKeyBase) {
             // Normal characters keys.
             keyCode = s60Keysym;
         } else {
@@ -966,13 +966,26 @@ void QSymbianControl::FocusChanged(TDrawNow /* aDrawNow */)
         qwidget->d_func()->setWindowTitle_sys(qwidget->windowTitle());
 #ifdef Q_WS_S60
         // If widget is fullscreen/minimized, hide status pane and button container otherwise show them.
-        CEikStatusPane* statusPane = S60->statusPane();
-        CEikButtonGroupContainer* buttonGroup = S60->buttonGroupContainer();
+        CEikStatusPane *statusPane = S60->statusPane();
+        CEikButtonGroupContainer *buttonGroup = S60->buttonGroupContainer();
         TBool visible = !(qwidget->windowState() & (Qt::WindowFullScreen | Qt::WindowMinimized));
         if (statusPane)
             statusPane->MakeVisible(visible);
-        if (buttonGroup)
-            buttonGroup->MakeVisible(visible);
+        if (buttonGroup) {
+            // Visibility
+            const TBool isFullscreen = qwidget->windowState() & Qt::WindowFullScreen;
+            const TBool cbaVisibilityHint = qwidget->windowFlags() & Qt::WindowSoftkeysVisibleHint;
+            buttonGroup->MakeVisible(visible || (isFullscreen && cbaVisibilityHint));
+
+            // Responsiviness
+            CEikCba *cba = static_cast<CEikCba *>( buttonGroup->ButtonGroup() ); // downcast from MEikButtonGroup
+            TUint cbaFlags = cba->ButtonGroupFlags();
+            if(qwidget->windowFlags() & Qt::WindowSoftkeysRespondHint)
+                cbaFlags |= EAknCBAFlagRespondWhenInvisible;
+            else
+                cbaFlags &= ~EAknCBAFlagRespondWhenInvisible;
+            cba->SetButtonGroupFlags(cbaFlags);
+        }
 #endif
     } else if (QApplication::activeWindow() == qwidget->window()) {
         if (CCoeEnv::Static()->AppUi()->IsDisplayingMenuOrDialog()) {
@@ -1229,7 +1242,7 @@ void qt_init(QApplicationPrivate * /* priv */, int)
             S60->avkonComponentsSupportTransparency = (value==1) ? true : false;
         }
     }
-#endif    
+#endif
 
     if (touch) {
         QApplicationPrivate::navigationMode = Qt::NavigationModeNone;
diff --git a/src/gui/kernel/qsoftkeymanager_s60.cpp b/src/gui/kernel/qsoftkeymanager_s60.cpp
index 8ac1e31..2a1ecc5 100644
--- a/src/gui/kernel/qsoftkeymanager_s60.cpp
+++ b/src/gui/kernel/qsoftkeymanager_s60.cpp
@@ -73,11 +73,21 @@ bool QSoftKeyManagerPrivateS60::skipCbaUpdate()
     // Lets not update softkeys if
     // 1. We don't have application panes, i.e. cba
     // 2. Our CBA is not active, i.e. S60 native dialog or menu with custom CBA is shown
+    //    2.1. Except if thre is no current CBA at all and WindowSoftkeysRespondHint is set
+
     // Note: Cannot use IsDisplayingMenuOrDialog since CBA update can be triggered before
     // menu/dialog CBA is actually displayed i.e. it is being costructed.
     CEikButtonGroupContainer *appUiCba = S60->buttonGroupContainer();
+    // CEikButtonGroupContainer::Current returns 0 if CBA is not visible at all
     CEikButtonGroupContainer *currentCba = CEikButtonGroupContainer::Current();
-    if (QApplication::testAttribute(Qt::AA_S60DontConstructApplicationPanes) || appUiCba != currentCba) {
+    // Check if softkey need to be update even they are not visible
+    bool cbaRespondsWhenInvisible = false;
+    QWidget *window = QApplication::activeWindow();
+    if (window && (window->windowFlags() & Qt::WindowSoftkeysRespondHint))
+        cbaRespondsWhenInvisible = true;
+
+    if (QApplication::testAttribute(Qt::AA_S60DontConstructApplicationPanes)
+            || (appUiCba != currentCba && !cbaRespondsWhenInvisible)) {
         return true;
     }
     return false;
diff --git a/src/gui/kernel/qwidget_s60.cpp b/src/gui/kernel/qwidget_s60.cpp
index ebd289c..7bbc142 100644
--- a/src/gui/kernel/qwidget_s60.cpp
+++ b/src/gui/kernel/qwidget_s60.cpp
@@ -1042,7 +1042,13 @@ void QWidget::setWindowState(Qt::WindowStates newstate)
     Q_D(QWidget);
 
     Qt::WindowStates oldstate = windowState();
-    if (oldstate == newstate)
+
+    const TBool isFullscreen = newstate & Qt::WindowFullScreen;
+    const TBool cbaRequested = windowFlags() & Qt::WindowSoftkeysVisibleHint;
+    const TBool cbaVisible = CEikButtonGroupContainer::Current() ? true : false;
+    const TBool softkeyVisibilityChange = isFullscreen && (cbaRequested != cbaVisible);
+
+    if (oldstate == newstate && !softkeyVisibilityChange)
         return;
 
     if (isWindow()) {
@@ -1058,16 +1064,27 @@ void QWidget::setWindowState(Qt::WindowStates newstate)
 
 #ifdef Q_WS_S60
         // Hide window decoration when switching to fullsccreen / minimized otherwise show decoration.
-        // The window decoration visibility has to be changed before doing actual window state 
-        // change since in that order the availableGeometry will return directly the right size and 
+        // The window decoration visibility has to be changed before doing actual window state
+        // change since in that order the availableGeometry will return directly the right size and
         // we will avoid unnecessarty redraws
-        CEikStatusPane* statusPane = S60->statusPane();
-        CEikButtonGroupContainer* buttonGroup = S60->buttonGroupContainer();
-        TBool visible = !(newstate & (Qt::WindowFullScreen | Qt::WindowMinimized)); 
+        CEikStatusPane *statusPane = S60->statusPane();
+        CEikButtonGroupContainer *buttonGroup = S60->buttonGroupContainer();
+        TBool visible = !(newstate & (Qt::WindowFullScreen | Qt::WindowMinimized));
         if (statusPane)
             statusPane->MakeVisible(visible);
-        if (buttonGroup)
-            buttonGroup->MakeVisible(visible);
+        if (buttonGroup) {
+            // Visibility
+            buttonGroup->MakeVisible(visible || (isFullscreen && cbaRequested));
+
+            // Responsiviness
+            CEikCba *cba = static_cast<CEikCba *>( buttonGroup->ButtonGroup() ); // downcast from MEikButtonGroup
+            TUint cbaFlags = cba->ButtonGroupFlags();
+            if(windowFlags() & Qt::WindowSoftkeysRespondHint)
+                cbaFlags |= EAknCBAFlagRespondWhenInvisible;
+            else
+                cbaFlags &= ~EAknCBAFlagRespondWhenInvisible;
+            cba->SetButtonGroupFlags(cbaFlags);
+        }
 #endif // Q_WS_S60
 
         createWinId();
@@ -1080,7 +1097,7 @@ void QWidget::setWindowState(Qt::WindowStates newstate)
         const QRect normalGeometry = (top->normalGeometry.width() < 0) ? geometry() : top->normalGeometry;
 
         if (newstate & Qt::WindowFullScreen)
-            setGeometry(qApp->desktop()->screenGeometry(this));
+            setGeometry(qApp->desktop()->availableGeometry(this));
         else if (newstate & Qt::WindowMaximized)
             setGeometry(qApp->desktop()->availableGeometry(this));
         else