MediaPlayer: Toggling Fullscreen wrongly reset control status

All controls were enabled when toggling fullscreen on and off;
now it recalls the argument last used in SetEnabled() and reuse it
when called in AttachedInWindow() (which occurs in such toggling)

Fixes #8804.

src/apps/mediaplayer/ControllerView.cpp

@@ -89,14 +89,6 @@ ControllerView::MessageReceived(BMessage* message)
 // #pragma mark -
 
 
-uint32
-ControllerView::EnabledButtons()
-{
-	// TODO: superflous
-	return 0xffffffff;
-}
-
-
 void
 ControllerView::TogglePlaying()
 {

src/apps/mediaplayer/ControllerView.h

@@ -38,7 +38,6 @@ public:
 						~ControllerView();
 
 	// TransportControlGroup interface
-	virtual	uint32		EnabledButtons();
 	virtual	void		TogglePlaying();
 	virtual	void		Stop();
 	virtual	void		Rewind();

src/apps/mediaplayer/interface/TransportControlGroup.cpp

@@ -66,7 +66,8 @@ TransportControlGroup::TransportControlGroup(BRect frame, bool useSkipButtons,
 	fPlayPause(NULL),
 	fStop(NULL),
 	fMute(NULL),
-	fSymbolScale(1.0f)
+	fSymbolScale(1.0f),
+	fLastEnabledButtons(0)
 {
 	// Pick a symbol size based on the current system font size, but make
 	// sure the size is uneven, so the pointy shapes have their middle on
@@ -284,7 +285,7 @@ TransportControlGroup::MessageReceived(BMessage* message)
 uint32
 TransportControlGroup::EnabledButtons()
 {
-	return 0;
+	return fLastEnabledButtons;
 }
 
 
@@ -363,6 +364,8 @@ TransportControlGroup::SetEnabled(uint32 buttons)
 	if (!LockLooper())
 		return;
 
+	fLastEnabledButtons = buttons;
+
 	fSeekSlider->SetEnabled(buttons & SEEK_ENABLED);
 	fSeekSlider->SetToolTip((buttons & SEEK_ENABLED) != 0
 		? fPositionToolTip : NULL);

src/apps/mediaplayer/interface/TransportControlGroup.h

@@ -122,6 +122,7 @@ private:
 			BGroupLayout*		fControlLayout;
 
 			float				fSymbolScale;
+			uint32				fLastEnabledButtons;
 };
 
 #endif	// TRANSPORT_CONTROL_GROUP_H