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public/vgui_controls/PHandle.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef PHANDLE_H
+#define PHANDLE_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include <vgui/VGUI.h>
+
+namespace vgui
+{
+
+class Panel;
+
+//-----------------------------------------------------------------------------
+// Purpose: Safe pointer class for handling Panel or derived panel classes
+//-----------------------------------------------------------------------------
+class PHandle
+{
+public:
+	PHandle() : m_iPanelID(INVALID_PANEL) {} //m_iSerialNumber(0), m_pListEntry(0) {}
+
+	Panel *Get();
+	Panel *Set( Panel *pPanel );
+	Panel *Set( HPanel hPanel );
+
+	operator Panel *()						{ return Get(); }
+	Panel * operator ->()					{ return Get(); }
+	Panel * operator = (Panel *pPanel)		{ return Set(pPanel); }
+
+	bool operator == (Panel *pPanel)		{ return (Get() == pPanel); }
+	operator bool ()						{ return Get() != 0; }
+
+private:
+	HPanel m_iPanelID;
+};
+
+//-----------------------------------------------------------------------------
+// Purpose: Safe pointer class to just convert between VPANEL's and PHandle
+//-----------------------------------------------------------------------------
+class VPanelHandle
+{
+public:
+	VPanelHandle() : m_iPanelID(INVALID_PANEL) {}
+
+	VPANEL Get();
+	VPANEL Set( VPANEL pPanel );
+
+	operator VPANEL ()						{ return Get(); }
+	VPANEL operator = (VPANEL pPanel)		{ return Set(pPanel); }
+
+	bool operator == (VPANEL pPanel)		{ return (Get() == pPanel); }
+	operator bool ()						{ return Get() != 0; }
+
+private:
+	HPanel m_iPanelID;
+};
+
+//-----------------------------------------------------------------------------
+// Purpose: DHANDLE is a templated version of PHandle
+//-----------------------------------------------------------------------------
+template< class PanelType >
+class DHANDLE : public PHandle
+{
+public:
+	PanelType *Get()					{ return (PanelType *)PHandle::Get(); }
+	PanelType *Set( PanelType *pPanel )	{ return (PanelType *)PHandle::Set(pPanel); }
+	PanelType *Set( HPanel hPanel )		{ return (PanelType *)PHandle::Set(hPanel); }
+
+	operator PanelType *()						{ return (PanelType *)PHandle::Get(); }
+	PanelType * operator ->()					{ return (PanelType *)PHandle::Get(); }
+	PanelType * operator = (PanelType *pPanel)	{ return (PanelType *)PHandle::Set(pPanel); }
+	bool operator == (Panel *pPanel)			{ return (PHandle::Get() == pPanel); }
+	operator bool ()							{ return PHandle::Get() != NULL; }
+};
+
+};
+
+#endif // PHANDLE_H