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app/legion/menumanager.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: The menu manager  
+//
+// $Revision: $
+// $NoKeywords: $
+//===========================================================================//
+
+#include "menumanager.h"
+#include "vgui_controls/panel.h"
+#include "vgui_controls/frame.h"
+#include "uimanager.h"
+
+
+//-----------------------------------------------------------------------------
+// Singleton
+//-----------------------------------------------------------------------------
+static CMenuManager s_MenuManager;
+extern CMenuManager *g_pMenuManager = &s_MenuManager;
+
+
+//-----------------------------------------------------------------------------
+// Static members.
+// NOTE: Do *not* set this to 0; it could cause us to lose some registered
+// menus since that list is set up during construction
+//-----------------------------------------------------------------------------
+IMenuFactory *CMenuManager::m_pFirstFactory;
+
+
+//-----------------------------------------------------------------------------
+// Call to register methods which can construct menus w/ particular names
+//-----------------------------------------------------------------------------
+IMenuFactory *CMenuManager::RegisterMenu( IMenuFactory *pMenuFactory )
+{
+	// NOTE: This method is expected to be called during global constructor
+	// time, so it must not require any global constructors to be called to work
+	IMenuFactory *pPrevFactory = m_pFirstFactory;
+	m_pFirstFactory = pMenuFactory;
+	return pPrevFactory;
+}
+
+	
+//-----------------------------------------------------------------------------
+// Init, shutdown
+//-----------------------------------------------------------------------------
+bool CMenuManager::Init()
+{
+	// Build a dictionary of all registered menus
+	IMenuFactory *pFactory;
+	for ( pFactory = m_pFirstFactory; pFactory; pFactory = pFactory->GetNextFactory() )
+	{
+		m_MenuFactories.Insert( pFactory->GetMenuName(), pFactory );
+	}
+
+	m_bPopRequested = false;
+	m_bPopAllRequested = false;
+	m_pPushRequested = NULL;
+
+	return true;
+}
+
+void CMenuManager::Shutdown()
+{
+	CleanUpAllMenus();
+}
+
+	
+//-----------------------------------------------------------------------------
+// Push, pop menus
+//-----------------------------------------------------------------------------
+void CMenuManager::PushMenu( const char *pMenuName )
+{
+	AssertMsg( !m_pPushRequested, "Can't request to push two menus in a single frame!" );
+
+	MenuFactoryIndex_t i = m_MenuFactories.Find( pMenuName );
+	if ( i == m_MenuFactories.InvalidIndex() )
+	{
+		Warning( "Tried to push unknown menu %s\n", pMenuName );
+		return;
+	}
+	m_pPushRequested = m_MenuFactories[i];
+}
+
+void CMenuManager::PopMenu( )
+{
+	AssertMsg( !m_bPopRequested, "Can't request to pop two menus in a single frame!" );
+	AssertMsg( !m_pPushRequested, "Can't request to pop after requesting to push a menu in a single frame!" );
+	m_bPopRequested = true;
+}
+
+void CMenuManager::PopAllMenus( )
+{
+	AssertMsg( !m_pPushRequested, "Can't request to pop after requesting to push a menu in a single frame!" );
+	m_bPopAllRequested = true;
+}
+
+
+//-----------------------------------------------------------------------------
+// Request a menu to switch to
+//-----------------------------------------------------------------------------
+void CMenuManager::SwitchToMenu( const char *pMenuName )
+{
+	AssertMsg( !m_bPopRequested, "Can't request to pop two menus in a single frame!" );
+	AssertMsg( !m_pPushRequested, "Can't request to push two menus in a single frame!" );
+
+	MenuFactoryIndex_t i = m_MenuFactories.Find( pMenuName );
+	if ( i == m_MenuFactories.InvalidIndex() )
+	{
+		Warning( "Tried to switch to unknown menu %s\n", pMenuName );
+		return;
+	}
+	m_bPopRequested = true;
+	m_pPushRequested = m_MenuFactories[i];
+}
+
+
+//-----------------------------------------------------------------------------
+// Returns the name of the topmost panel
+//-----------------------------------------------------------------------------
+const char *CMenuManager::GetTopmostPanelName()
+{
+	if ( !m_nActiveMenu.Count() )
+		return NULL;
+	return m_nActiveMenu.Top()->GetName();
+}
+
+	
+//-----------------------------------------------------------------------------
+// Request a menu to switch to
+//-----------------------------------------------------------------------------
+void CMenuManager::Update( )
+{
+	if ( m_bPopAllRequested )
+	{
+		CleanUpAllMenus();
+		m_bPopAllRequested = false;
+		return;
+	}
+
+	if ( m_bPopRequested )
+	{
+		AssertMsg( m_nActiveMenu.Count(), "Tried to pop a menu when no menus are active" );
+		vgui::Panel *pTop = m_nActiveMenu.Top();
+		pTop->MarkForDeletion();
+		m_nActiveMenu.Pop();
+
+		// Mark the new active menu as visible, attach it to hierarchy.
+		if ( m_nActiveMenu.Count() > 0 )
+		{
+			vgui::Panel *pTop = m_nActiveMenu.Top();
+			pTop->SetVisible( true );
+			pTop->SetParent( g_pUIManager->GetRootPanel( UI_ROOT_MENU ) );
+		}
+		else
+		{
+			g_pUIManager->EnablePanel( UI_ROOT_MENU, false );
+		}
+		m_bPopRequested = false;
+	}
+
+	if ( m_pPushRequested )
+	{
+		// Mark the previous menu as not visible, detach it from hierarchy.
+		if ( m_nActiveMenu.Count() > 0 )
+		{
+			vgui::Panel *pTop = m_nActiveMenu.Top();
+			pTop->SetVisible( false );
+			pTop->SetParent( (vgui::Panel*)NULL );
+		}
+		else
+		{
+			g_pUIManager->EnablePanel( UI_ROOT_MENU, true );
+		}
+		vgui::Panel *pMenu = m_pPushRequested->CreateMenu( g_pUIManager->GetRootPanel( UI_ROOT_MENU ) );
+		m_nActiveMenu.Push( pMenu );
+		static_cast<vgui::Frame*>( pMenu )->Activate();
+		m_pPushRequested = NULL;
+	}
+}
+
+	
+//-----------------------------------------------------------------------------
+// Cleans up all menus
+//-----------------------------------------------------------------------------
+void CMenuManager::CleanUpAllMenus()
+{
+	while ( m_nActiveMenu.Count() )
+	{
+		vgui::Panel *pTop = m_nActiveMenu.Top();
+		pTop->MarkForDeletion();
+		m_nActiveMenu.Pop();
+	}
+	g_pUIManager->EnablePanel( UI_ROOT_MENU, false );
+}
+