Reverse the meaning of BWindow fShowLevel to match BView.

This also matches the client_window_info.show_hide_level field used in Deskbar
and other applications.

While doing this, keep fShowLevel fully in sync between BWindow and app_server,
use one message type for both hiding and showing, and make the decision to show
and hide the window in the app_server.

Lastly make minimize behave as described in the Be Book: hidden windows cannot
be minimized, and minimized windows which get hidden become unminimized.

headers/os/interface/Window.h

@@ -352,6 +352,7 @@ private:
 
 			void				_GetDecoratorSize(float* _borderWidth,
 									float* _tabHeight) const;
+			void				_SendShowOrHideMessage();
 
 private:
 			char*				fTitle;

headers/private/app/ServerProtocol.h

@@ -87,8 +87,8 @@ enum {
 	AS_GET_CURSOR_BITMAP,
 
 	// Window definitions
-	AS_SHOW_WINDOW,
-	AS_HIDE_WINDOW,
+	AS_SHOW_OR_HIDE_WINDOW,
+	AS_INTERNAL_HIDE_WINDOW,
 	AS_MINIMIZE_WINDOW,
 	AS_QUIT_WINDOW,
 	AS_SEND_BEHIND,

src/kits/interface/Window.cpp

@@ -589,7 +589,8 @@ BWindow::ChildAt(int32 index) const
 void
 BWindow::Minimize(bool minimize)
 {
-	if (IsModal() || IsFloating() || fMinimized == minimize || !Lock())
+	if (IsModal() || IsFloating() || IsHidden() || fMinimized == minimize
+		|| !Lock())
 		return;
 
 	fMinimized = minimize;
@@ -769,10 +770,7 @@ BWindow::MessageReceived(BMessage* msg)
 			// connect all views to the server again
 			fTopView->_CreateSelf();
 
-			if (fShowLevel >= 1) {
-				fLink->StartMessage(AS_SHOW_WINDOW);
-				fLink->Flush();
-			}
+			_SendShowOrHideMessage();
 		}
 
 		return BLooper::MessageReceived(msg);
@@ -2094,10 +2092,6 @@ BWindow::IsMinimized() const
 	if (!locker.IsLocked())
 		return false;
 
-	// Hiding takes precendence over minimization!!!
-	if (IsHidden())
-		return false;
-
 	return fMinimized;
 }
 
@@ -2607,13 +2601,9 @@ BWindow::Show()
 {
 	bool runCalled = true;
 	if (Lock()) {
-		fShowLevel++;
+		fShowLevel--;
 
-		if (fShowLevel == 1) {
-			fLink->StartMessage(AS_SHOW_WINDOW);
-			fLink->Attach<int32>(fShowLevel);
-			fLink->Flush();
-		}
+		_SendShowOrHideMessage();
 
 		runCalled = fRunCalled;
 
@@ -2638,25 +2628,24 @@ BWindow::Show()
 void
 BWindow::Hide()
 {
-	if (!Lock())
-		return;
+	if (Lock()) {
+		// If we are minimized and are about to be hidden, unminimize
+		if (IsMinimized() && fShowLevel == 0)
+			Minimize(false);
 
-	fShowLevel--;
+		fShowLevel++;
 
-	if (fShowLevel == 0) {
-		fLink->StartMessage(AS_HIDE_WINDOW);
-		fLink->Attach<int32>(fShowLevel);
-		fLink->Flush();
+		_SendShowOrHideMessage();
+
+		Unlock();
 	}
-
-	Unlock();
 }
 
 
 bool
 BWindow::IsHidden() const
 {
-	return fShowLevel <= 0;
+	return fShowLevel > 0;
 }
 
 
@@ -2793,7 +2782,7 @@ BWindow::_InitData(BRect frame, const char* title, window_look look,
 	fInTransaction = bitmapToken >= 0;
 	fUpdateRequested = false;
 	fActive = false;
-	fShowLevel = 0;
+	fShowLevel = 1;
 
 	fTopView = NULL;
 	fFocus = NULL;
@@ -4061,6 +4050,15 @@ BWindow::_GetDecoratorSize(float* _borderWidth, float* _tabHeight) const
 }
 
 
+void
+BWindow::_SendShowOrHideMessage()
+{
+	fLink->StartMessage(AS_SHOW_OR_HIDE_WINDOW);
+	fLink->Attach<int32>(fShowLevel);
+	fLink->Flush();
+}
+
+
 //	#pragma mark - C++ binary compatibility kludge
 
 

src/servers/app/ProfileMessageSupport.cpp

@@ -66,8 +66,8 @@ string_for_message_code(uint32 code, BString& string)
 		CODE(AS_GET_CURSOR_BITMAP);
 
 		// Window definitions
-		CODE(AS_SHOW_WINDOW);
-		CODE(AS_HIDE_WINDOW);
+		CODE(AS_SHOW_OR_HIDE_WINDOW);
+		CODE(AS_INTERNAL_HIDE_WINDOW);
 		CODE(AS_MINIMIZE_WINDOW);
 		CODE(AS_QUIT_WINDOW);
 		CODE(AS_SEND_BEHIND);

src/servers/app/ServerWindow.cpp

@@ -315,7 +315,7 @@ ServerWindow::_PrepareQuit()
 		_Hide();
 		fDesktop->UnlockSingleWindow();
 	} else if (fThread >= B_OK)
-		PostMessage(AS_HIDE_WINDOW);
+		PostMessage(AS_INTERNAL_HIDE_WINDOW);
 }
 
 
@@ -481,9 +481,7 @@ ServerWindow::GetInfo(window_info& info)
 	info.window_right = (int)floor(fWindow->Frame().right);
 	info.window_bottom = (int)floor(fWindow->Frame().bottom);
 
-	// This is essentially opposite of the ShowLevel, meaning a window is
-	// hidden if it is 1 or more, and shown if it is 0 or less.
-	info.show_hide_level = fWindow->ShowLevel() <= 0 ? 1 : 0;
+	info.show_hide_level = fWindow->ShowLevel();
 	info.is_mini = fWindow->IsMinimized();
 }
 
@@ -596,44 +594,32 @@ void
 ServerWindow::_DispatchMessage(int32 code, BPrivate::LinkReceiver& link)
 {
 	switch (code) {
-		case AS_SHOW_WINDOW:
+		case AS_SHOW_OR_HIDE_WINDOW:
 		{
-			DTRACE(("ServerWindow %s: Message AS_SHOW_WINDOW\n", Title()));
-			_Show();
-
 			int32 showLevel;
 			if (link.Read<int32>(&showLevel) == B_OK) {
+				DTRACE(("ServerWindow %s: Message AS_SHOW_OR_HIDE_WINDOW, "
+					"show level: %d\n", Title(), showLevel));
+
 				fWindow->SetShowLevel(showLevel);
+				if (showLevel <= 0)
+					_Show();
+				else
+					_Hide();
 			}
 			break;
-
 		}
-		case AS_HIDE_WINDOW:
-		{
-			DTRACE(("ServerWindow %s: Message AS_HIDE_WINDOW\n", Title()));
+		// Only for internal use within this class
+		case AS_INTERNAL_HIDE_WINDOW:
 			_Hide();
-
-			int32 showLevel;
-			if (link.Read<int32>(&showLevel) == B_OK) {
-				fWindow->SetShowLevel(showLevel);
-			}
 			break;
-		}
 		case AS_MINIMIZE_WINDOW:
 		{
 			bool minimize;
-
 			if (link.Read<bool>(&minimize) == B_OK) {
 				DTRACE(("ServerWindow %s: Message AS_MINIMIZE_WINDOW, "
 					"minimize: %d\n", Title(), minimize));
 
-				if (fWindow->ShowLevel() <= 0) {
-					// Window is currently hidden - ignore the minimize
-					// request, but keep the state in sync.
-					fWindow->SetMinimized(minimize);
-					break;
-				}
-
 				fDesktop->UnlockSingleWindow();
 				fDesktop->MinimizeWindow(fWindow, minimize);
 				fDesktop->LockSingleWindow();

src/servers/app/Window.cpp

@@ -102,9 +102,10 @@ Window::Window(const BRect& frame, const char *name,
 	fInUpdate(false),
 	fUpdatesEnabled(true),
 
-	// windows start hidden
+	// Windows start hidden
 	fHidden(true),
-	fShowLevel(0),
+	// Hidden is 1 or more
+	fShowLevel(1),
 	fMinimized(false),
 	fIsFocus(false),