Implemented the missing BView::IsHidden(BView *lookingFrom), fixed

BView::IsHidden().
Commented a ToDo: item in BView::Hide().


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@5417 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/interface/View.cpp

@@ -702,12 +702,15 @@ BRect BView::Frame() const {
 
 //---------------------------------------------------------------------------
 
-void BView::Hide(){
+void
+BView::Hide()
+{
 // TODO: You may hide it by relocating with -17000 coord units to the left???
-	if ( owner && fShowLevel == 0){
+//	"I don't think you want to do that" - axeld.
+	if (owner && fShowLevel == 0) {
 		check_lock();
-			
+
-		owner->session->WriteInt32( AS_LAYER_HIDE );
+		owner->session->WriteInt32(AS_LAYER_HIDE);
 	}
 
 	fShowLevel++;
@@ -739,20 +742,37 @@ bool BView::IsFocus() const {
 
 //---------------------------------------------------------------------------
 
-bool BView::IsHidden() const{
+bool 
+BView::IsHidden(const BView *lookingFrom) const
+{
 	if (fShowLevel > 0)
 		return true;
 
-	if (owner)
+	// may we be egocentric?
-		if (owner->IsHidden())
+	if (lookingFrom == this)
-			return true;
+		return false;
 
+	// we have the same visibility state as our
+	// parent, if there is one
 	if (parent)
 		return parent->IsHidden();
 
+	// if we're the top view, and we're interested
+	// in the "global" view, we're inheriting the
+	// state of the window's visibility
+	if (owner && lookingFrom == NULL)
+		return owner->IsHidden();
+
 	return false;
 }
 
+
+bool
+BView::IsHidden() const
+{
+	return IsHidden(NULL);
+}
+
 //---------------------------------------------------------------------------
 
 bool BView::IsPrinting() const {