Improvements to itemview keypad navigation in S60.

The logic used in this commit is partially taken from sliders.

This commit makes it possible to interact (change row or column)
in itemview even itemview does not have editFocus. Interacting without
editFocus is enabled when it is not possible to keypad navigate to
reuqested direction. In addition if keypad navigation to any direction is
not possible (i.e there is only one listwidget on screen), there is no
sense to add "done" softkey to get out of edit focus.

Task-number: QTBUG-4802
Reviewed-by: Alessandro Portale

1 files changed, 43 insertions, 0 deletions

diff --git a/src/gui/kernel/qwidget.cpp b/src/gui/kernel/qwidget.cpp
index 850e961..d3340df 100644
--- a/src/gui/kernel/qwidget.cpp
+++ b/src/gui/kernel/qwidget.cpp
@@ -118,6 +118,10 @@
 #include "private/qgraphicssystem_p.h"
 #include "private/qgesturemanager_p.h"
 
+#ifdef QT_KEYPAD_NAVIGATION
+#include "qtabwidget.h" // Needed in inTabWidget()
+#endif // QT_KEYPAD_NAVIGATION
+
 // widget/widget data creation count
 //#define QWIDGET_EXTRA_DEBUG
 //#define ALIEN_DEBUG
@@ -11626,6 +11630,45 @@ QWidget *QWidgetPrivate::widgetInNavigationDirection(Direction direction)
     }
     return targetWidget;
 }
+
+/*!
+    \internal
+
+    Tells us if it there is currently a reachable widget by keypad navigation in
+    a certain \a orientation.
+    If no navigation is possible, occuring key events in that \a orientation may
+    be used to interact with the value in the focussed widget, even though it
+    currently has not the editFocus.
+
+    \sa QWidgetPrivate::widgetInNavigationDirection(), QWidget::hasEditFocus()
+*/
+bool QWidgetPrivate::canKeypadNavigate(Qt::Orientation orientation)
+{
+    return orientation == Qt::Horizontal?
+            (QWidgetPrivate::widgetInNavigationDirection(QWidgetPrivate::DirectionEast)
+                    || QWidgetPrivate::widgetInNavigationDirection(QWidgetPrivate::DirectionWest))
+            :(QWidgetPrivate::widgetInNavigationDirection(QWidgetPrivate::DirectionNorth)
+                    || QWidgetPrivate::widgetInNavigationDirection(QWidgetPrivate::DirectionSouth));
+}
+/*!
+    \internal
+
+    Checks, if the \a widget is inside a QTabWidget. If is is inside
+    one, left/right key events will be used to switch between tabs in keypad
+    navigation. If there is no QTabWidget, the horizontal key events can be used
+to
+    interact with the value in the focussed widget, even though it currently has
+    not the editFocus.
+
+    \sa QWidget::hasEditFocus()
+*/
+bool QWidgetPrivate::inTabWidget(QWidget *widget)
+{
+    for (QWidget *tabWidget = widget; tabWidget; tabWidget = tabWidget->parentWidget())
+        if (qobject_cast<const QTabWidget*>(tabWidget))
+            return true;
+    return false;
+}
 #endif
 
 /*!