Implement menu hovering for native Mac menus.

Set the status text, emit QMenu::hovered and
QAction::hovered.

3 files changed, 31 insertions, 3 deletions

diff --git a/src/gui/widgets/qcocoamenu_mac.mm b/src/gui/widgets/qcocoamenu_mac.mm
index c442d5b..31f5020 100644
--- a/src/gui/widgets/qcocoamenu_mac.mm
+++ b/src/gui/widgets/qcocoamenu_mac.mm
@@ -46,6 +46,7 @@
 #import <private/qcocoamenuloader_mac_p.h>
 #include <private/qt_cocoa_helpers_mac_p.h>
 #include <private/qapplication_p.h>
+#include <private/qaction_p.h>
 
 #include <QtGui/QMenu>
 
@@ -70,6 +71,7 @@ QT_USE_NAMESPACE
     self = [super init];
     if (self) {
         qmenu = menu;
+        previousAction = 0;
         [self setAutoenablesItems:NO];
         [self setDelegate:self];
     }
@@ -81,13 +83,20 @@ QT_USE_NAMESPACE
     Q_UNUSED(menu);
 
     if (!item) {
-        // ### According to the docs everything will be highlighted. Not sure what we should do in
-        // Qt, so just return.
+        if (previousAction) {
+            qt_mac_clear_status_text(previousAction);
+            previousAction = 0;
+        }
         return;
     }
 
-    if (QAction *action = reinterpret_cast<QAction *>([item tag]))
+    if (QAction *action = reinterpret_cast<QAction *>([item tag])) {
+        QMenu *qtmenu = static_cast<QT_MANGLE_NAMESPACE(QCocoaMenu) *>(menu)->qmenu;
+        previousAction = action;
         action->activate(QAction::Hover);
+        qt_mac_menu_emit_hovered(qtmenu, action);
+        action->showStatusText(0); // 0 widget -> action's parent
+    }
 }
 
 - (void)menuWillOpen:(NSMenu*)menu;
@@ -103,6 +112,10 @@ QT_USE_NAMESPACE
 - (void)menuDidClose:(NSMenu*)menu;
 {
     qt_mac_emit_menuSignals(((QT_MANGLE_NAMESPACE(QCocoaMenu) *)menu)->qmenu, false);
+    if (previousAction) {
+        qt_mac_clear_status_text(previousAction);
+        previousAction = 0;
+    }
 }
 
 - (BOOL)hasShortcut:(NSMenu *)menu forKey:(NSString *)key forModifiers:(NSUInteger)modifier
@@ -194,6 +207,18 @@ void qt_mac_emit_menuSignals(QMenu *menu, bool show)
     }
     qt_mac_menus_open_count += delta;
 }
+
+void qt_mac_clear_status_text(QAction *action)
+{
+    action->d_func()->showStatusText(0, QString());
+}
+
+void qt_mac_menu_emit_hovered(QMenu *menu, QAction *action)
+{
+    emit menu->hovered(action);
+}
+
+
 QT_END_NAMESPACE
 
 #endif
diff --git a/src/gui/widgets/qcocoamenu_mac_p.h b/src/gui/widgets/qcocoamenu_mac_p.h
index 0c8989a..3ad0ab8 100644
--- a/src/gui/widgets/qcocoamenu_mac_p.h
+++ b/src/gui/widgets/qcocoamenu_mac_p.h
@@ -52,6 +52,7 @@
 
 #include "qmacdefines_mac.h"
 #ifdef QT_MAC_USE_COCOA
+#include <qpointer.h>
 #import <Cocoa/Cocoa.h>
 
 QT_FORWARD_DECLARE_CLASS(QMenu)
@@ -71,6 +72,7 @@ QT_FORWARD_DECLARE_CLASS(QMenu)
 @interface QT_MANGLE_NAMESPACE(QCocoaMenu) : NSMenu <NSMenuDelegate>
 {
     QMenu *qmenu;
+    QPointer<QAction> previousAction;
 }
 - (id)initWithQMenu:(QMenu*)menu;
 - (BOOL)menuHasKeyEquivalent:(NSMenu *)menu forEvent:(NSEvent *)event target:(id *)target action:(SEL *)action;
diff --git a/src/gui/widgets/qmenu.h b/src/gui/widgets/qmenu.h
index 0346a55..5660301 100644
--- a/src/gui/widgets/qmenu.h
+++ b/src/gui/widgets/qmenu.h
@@ -415,6 +415,7 @@ private:
     friend OSStatus qt_mac_menu_event(EventHandlerCallRef, EventRef, void *);
     friend bool qt_mac_activate_action(OSMenuRef, uint, QAction::ActionEvent, bool);
     friend void qt_mac_emit_menuSignals(QMenu *, bool);
+    friend void qt_mac_menu_emit_hovered(QMenu *menu, QAction *action);
 #endif
 };