Allow actions in a QMenu to show their tooltips

This introduces a property QMenu::toolTipsVisible with
default value set to 'false'.

Task-number: QTBUG-13663
Task-number: QTBUG-2362
Change-Id: I13079609e2a92adc71b2bbff3dd94494cde1f586
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

src/widgets/widgets/qmenu.cpp

@@ -67,6 +67,7 @@
 #include "qwidgetaction.h"
 #include "qtoolbutton.h"
 #include "qpushbutton.h"
+#include "qtooltip.h"
 #include <private/qpushbutton_p.h>
 #include <private/qaction_p.h>
 #include <private/qguiapplication_p.h>
@@ -2368,6 +2369,19 @@ QMenu::event(QEvent *e)
         if (d->currentAction)
             d->popupAction(d->currentAction, 0, false);
         break;
+#ifndef QT_NO_TOOLTIP
+    case QEvent::ToolTip:
+        if (d->toolTipsVisible) {
+            const QHelpEvent *ev = static_cast<const QHelpEvent*>(e);
+            if (const QAction *action = actionAt(ev->pos())) {
+                const QString toolTip = action->d_func()->tooltip;
+                if (!toolTip.isEmpty())
+                    QToolTip::showText(ev->globalPos(), toolTip, this);
+                return true;
+            }
+        }
+        break;
+#endif // QT_NO_TOOLTIP
 #ifndef QT_NO_WHATSTHIS
     case QEvent::QueryWhatsThis:
         e->setAccepted(d->whatsThis.size());
@@ -3089,6 +3103,32 @@ void QMenu::setSeparatorsCollapsible(bool collapse)
         d->platformMenu->syncSeparatorsCollapsible(collapse);
 }
 
+/*!
+  \property QMenu::toolTipsVisible
+  \since 5.1
+
+  \brief whether tooltips of menu actions should be visible
+
+  This property specifies whether action menu entries show
+  their tooltip.
+
+  By default, this property is false.
+*/
+bool QMenu::toolTipsVisible() const
+{
+    Q_D(const QMenu);
+    return d->toolTipsVisible;
+}
+
+void QMenu::setToolTipsVisible(bool visible)
+{
+    Q_D(QMenu);
+    if (d->toolTipsVisible == visible)
+        return;
+
+    d->toolTipsVisible = visible;
+}
+
 QT_END_NAMESPACE
 
 // for private slots

src/widgets/widgets/qmenu.h

@@ -70,6 +70,7 @@ private:
     Q_PROPERTY(QString title READ title WRITE setTitle)
     Q_PROPERTY(QIcon icon READ icon WRITE setIcon)
     Q_PROPERTY(bool separatorsCollapsible READ separatorsCollapsible WRITE setSeparatorsCollapsible)
+    Q_PROPERTY(bool toolTipsVisible READ toolTipsVisible WRITE setToolTipsVisible)
 
 public:
     explicit QMenu(QWidget *parent = 0);
@@ -139,6 +140,9 @@ public:
     bool separatorsCollapsible() const;
     void setSeparatorsCollapsible(bool collapse);
 
+    bool toolTipsVisible() const;
+    void setToolTipsVisible(bool visible);
+
 Q_SIGNALS:
     void aboutToShow();
     void aboutToHide();

src/widgets/widgets/qmenu_p.h

@@ -84,7 +84,8 @@ class QMenuPrivate : public QWidgetPrivate
     Q_DECLARE_PUBLIC(QMenu)
 public:
     QMenuPrivate() : itemsDirty(0), maxIconWidth(0), tabWidth(0), ncols(0),
-                      collapsibleSeparators(true), activationRecursionGuard(false), hasHadMouse(0), aboutToHide(0), motions(0),
+                      collapsibleSeparators(true), toolTipsVisible(false),
+                      activationRecursionGuard(false), hasHadMouse(0), aboutToHide(0), motions(0),
                       currentAction(0),
 #ifdef QT_KEYPAD_NAVIGATION
                       selectAction(0),
@@ -123,6 +124,7 @@ public:
     QRect popupGeometry(int screen = -1) const;
     mutable uint ncols : 4; //4 bits is probably plenty
     uint collapsibleSeparators : 1;
+    uint toolTipsVisible : 1;
     QSize adjustMenuSizeForScreen(const QRect & screen);
     int getLastVisibleAction() const;