Added original SDK code for Alien Swarm.

game/shared/hintsystem.h

@@ -0,0 +1,116 @@
+//====== Copyright <20> 1996-2005, Valve Corporation, All rights reserved. =======
+//
+// Purpose: A class embedded in players to provide hints to that player
+//
+//=============================================================================
+
+#ifndef HINTSYSTEM_H
+#define HINTSYSTEM_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#ifdef CLIENT_DLL
+	#include "c_baseplayer.h"
+#else
+	#include "player.h"
+#endif
+
+#include "bitvec.h"
+
+class CHintMessageQueue;
+class CHintMessageTimers;
+
+typedef bool (*HintTimerCallback)( CBasePlayer *pOnPlayer );
+
+//-----------------------------------------------------------------------------
+// Purpose: A class embedded in players to provide hints to that player
+//-----------------------------------------------------------------------------
+class CHintSystem
+{
+	DECLARE_CLASS_NOBASE( CHintSystem );
+
+public:
+	CHintSystem();
+	~CHintSystem();
+
+	//-----------------------------------------------------
+	// Call this from your player constructor
+	void Init( CBasePlayer *pPlayer, int iMaxHintTypes, const char **pszHintStrings );
+
+	//-----------------------------------------------------
+	// CBasePlayer calls these for you, if you fall back to its 
+	// versions of Spawn(), Event_Killed(), and PreThink().
+	// Call this when your player respawns
+	void				ResetHints( void );
+
+	// Call this when your player dies
+	void				ResetHintTimers( void );
+
+	// Call this when in your player PreThink()
+	void				Update( void );
+
+	//-----------------------------------------------------
+	// Hint addition
+	// Call these to add a hint directly onscreen
+	bool 				HintMessage( int hint, bool bForce = false, bool bOnlyIfClear = false );
+	void 				HintMessage( const char *pMessage );
+
+	// Call this to add a hint timer. It'll be reset for you automatically 
+	// everytime ResetHintTimers() is called.
+	void				RegisterHintTimer( int iHintID, float flTimerDuration, bool bOnlyIfClear = false, HintTimerCallback pfnCallback = NULL );
+
+	// Call these to start & stop registered hint timers
+	void				StartHintTimer( int iHintID );
+	void				StopHintTimer( int iHintID );
+	void				RemoveHintTimer( int iHintID );
+	bool				TimerShouldFire( int iHintID );
+
+	// Set whether a player should see any hints at all
+	void				SetShowHints( bool bShowHints ) { m_bShowHints = bShowHints; }
+	void				SetHintPlayed( int iHintID );
+	bool				ShouldShowHints( void );
+
+	// Returns true if the hint has been played already
+	bool				HasPlayedHint( int iHintID );
+	void				PlayedAHint( void );
+	void				ClearHintHistory( void ) { m_HintHistory.ClearAll(); }
+
+	// Not really an optimal solution, but saves us querying the hud element,
+	// which wouldn't be easy with derived versions in different mods.
+	bool				HintIsCurrentlyVisible( void ) { return (gpGlobals->curtime - m_flLastHintPlayedAt < 11 ); }
+
+private:
+	void				ReAddHintTimerIfNotDisplayed( int iHintID, float flTimerDuration );
+
+private:
+	CBasePlayer			*m_pPlayer;
+
+	float				m_flLastHintPlayedAt;
+	bool				m_bShowHints;
+	CVarBitVec			m_HintHistory;
+	const char			**m_pszHintMessages;
+	CHintMessageQueue	*m_pHintMessageQueue;
+	CHintMessageTimers	*m_pHintMessageTimers;
+
+	struct onresethints_t
+	{
+		int					iHintID;
+		float				flTimer;
+		bool				bOnlyIfClear;
+		HintTimerCallback	pfnCallback;
+	};
+	CUtlVector<onresethints_t>	m_RegisteredResetHints;
+};
+
+#ifdef CLIENT_DLL
+// Derive from this if you have an entity that wants to display a hint
+// when the player waves his target ID over it on the client.
+abstract_class ITargetIDProvidesHint
+{
+public:
+	virtual void	DisplayHintTo( C_BasePlayer *pPlayer ) = 0;
+};
+#endif
+
+#endif // HINTSYSTEM_H