Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
//=============================================================================//
#include "cbase.h"
#include "base_loadout_panel.h"
#include "item_confirm_delete_dialog.h"
#include "vgui/ISurface.h"
#include "gamestringpool.h"
#include "iclientmode.h"
#include "econ_item_inventory.h"
#include "ienginevgui.h"
#include <vgui/ILocalize.h>
#include "vgui_controls/TextImage.h"
#include "vgui_controls/CheckButton.h"
#include "vgui_controls/ComboBox.h"
#include "vgui/IInput.h"
#include "econ_ui.h"
// memdbgon must be the last include file in a .cpp file!!!
#include <tier0/memdbgon.h>
#ifdef STAGING_ONLY
ConVar tf_use_card_tooltips( "tf_use_card_tooltips", "0", FCVAR_ARCHIVE );
#endif
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
CBaseLoadoutPanel::CBaseLoadoutPanel( vgui::Panel *parent, const char *panelName ) : EditablePanel(parent, panelName )
{
SetParent( parent );
// Use the client scheme
vgui::HScheme scheme = vgui::scheme()->LoadSchemeFromFileEx( enginevgui->GetPanel( PANEL_CLIENTDLL ), "resource/ClientScheme.res", "ClientScheme");
SetScheme(scheme);
SetProportional( true );
m_pItemModelPanelKVs = NULL;
m_pMouseOverItemPanel = vgui::SETUP_PANEL( new CItemModelPanel( this, "mouseoveritempanel" ) );
m_pMouseOverTooltip = new CItemModelPanelToolTip( this );
m_pMouseOverTooltip->SetupPanels( this, m_pMouseOverItemPanel );
#ifdef STAGING_ONLY
m_pMouseOverCardPanel = vgui::SETUP_PANEL( new CTFItemCardPanel( this, "mouseovercardpanel" ) );
m_pMouseOverCardTooltip = new CItemCardPanelToolTip( this );
m_pMouseOverCardTooltip->SetupPanels( this, m_pMouseOverCardPanel );
#endif
m_pItemPanelBeingMousedOver = NULL;
m_pCaratLabel = NULL;
m_pClassLabel = NULL;
m_nCurrentPage = 0;
m_bTooltipKeyPressed = false;
SetMouseInputEnabled( true );
SetKeyBoardInputEnabled( true );
ListenForGameEvent( "inventory_updated" );
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
CBaseLoadoutPanel::~CBaseLoadoutPanel()
{
if ( m_pItemModelPanelKVs )
{
m_pItemModelPanelKVs->deleteThis();
m_pItemModelPanelKVs = NULL;
}
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CBaseLoadoutPanel::ApplySchemeSettings( vgui::IScheme *pScheme )
{
BaseClass::ApplySchemeSettings( pScheme );
m_pCaratLabel = dynamic_cast<vgui::Label*>( FindChildByName("CaratLabel") );
m_pClassLabel = dynamic_cast<vgui::Label*>( FindChildByName("ClassLabel") );
m_bReapplyItemKVs = true;
for ( int i = 0; i < m_pItemModelPanels.Count(); i++ )
{
SetBorderForItem( m_pItemModelPanels[i], false );
}
m_pMouseOverItemPanel->SetBorder( pScheme->GetBorder("LoadoutItemPopupBorder") );
CreateItemPanels();
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CBaseLoadoutPanel::ApplySettings( KeyValues *inResourceData )
{
BaseClass::ApplySettings( inResourceData );
KeyValues *pItemKV = inResourceData->FindKey( "modelpanels_kv" );
if ( pItemKV )
{
if ( m_pItemModelPanelKVs )
{
m_pItemModelPanelKVs->deleteThis();
}
m_pItemModelPanelKVs = new KeyValues("modelpanels_kv");
pItemKV->CopySubkeys( m_pItemModelPanelKVs );
}
}
extern const char *g_szItemBorders[AE_MAX_TYPES][5];
extern ConVar cl_showbackpackrarities;
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CBaseLoadoutPanel::SetBorderForItem( CItemModelPanel *pItemPanel, bool bMouseOver )
{
if ( !pItemPanel )
return;
const char *pszBorder = NULL;
if ( pItemPanel->IsGreyedOut() )
{
if( pItemPanel->IsSelected() )
{
pszBorder = "BackpackItemGrayedOut_Selected";
}
else
{
pszBorder = "BackpackItemGrayedOut";
}
}
else
{
int iRarity = 0;
if ( pItemPanel->HasItem() && cl_showbackpackrarities.GetBool() )
{
iRarity = pItemPanel->GetItem()->GetItemQuality() ;
uint8 nRarity = pItemPanel->GetItem()->GetItemDefinition()->GetRarity();
if ( ( nRarity != k_unItemRarity_Any ) && ( iRarity != AE_SELFMADE ) )
{
// translate this quality to rarity
iRarity = nRarity + AE_RARITY_DEFAULT;
}
}
if ( pItemPanel->IsSelected() )
{
pszBorder = g_szItemBorders[iRarity][2];
}
if ( bMouseOver )
{
pszBorder = g_szItemBorders[iRarity][1];
}
else
{
pszBorder = g_szItemBorders[iRarity][0];
}
}
vgui::IScheme *pScheme = vgui::scheme()->GetIScheme( GetScheme() );
pItemPanel->SetBorder( pScheme->GetBorder( pszBorder ) );
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CBaseLoadoutPanel::ApplyKVsToItemPanels( void )
{
if ( m_pItemModelPanelKVs )
{
for ( int i = 0; i < m_pItemModelPanels.Count(); i++ )
{
m_pItemModelPanels[i]->ApplySettings( m_pItemModelPanelKVs );
SetBorderForItem( m_pItemModelPanels[i], false );
m_pItemModelPanels[i]->InvalidateLayout();
}
}
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CBaseLoadoutPanel::PerformLayout( void )
{
if ( m_bReapplyItemKVs )
{
m_bReapplyItemKVs = false;
ApplyKVsToItemPanels();
}
BaseClass::PerformLayout();
// If we're items only, we hide various elements
if ( m_pCaratLabel )
{
m_pCaratLabel->SetVisible( !m_bItemsOnly );
}
if ( m_pClassLabel )
{
m_pClassLabel->SetVisible( !m_bItemsOnly );
}
if ( m_pMouseOverItemPanel->IsVisible() )
{
// The mouseover panel was visible. Fake a panel entry into the original panel to get it to show up again properly.
if ( m_pItemPanelBeingMousedOver )
{
OnItemPanelEntered( m_pItemPanelBeingMousedOver );
}
else
{
HideMouseOverPanel();
}
}
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CBaseLoadoutPanel::AddNewItemPanel( int iPanelIndex )
{
CItemModelPanel *pPanel = vgui::SETUP_PANEL( new CItemModelPanel( this, VarArgs("modelpanel%d", iPanelIndex) ) );
pPanel->SetActAsButton( true, true );
m_pItemModelPanels.AddToTail( pPanel );
#ifdef STAGING_ONLY
if ( tf_use_card_tooltips.GetBool() )
{
pPanel->SetTooltip( m_pMouseOverCardTooltip, "" );
}
else
#endif
pPanel->SetTooltip( m_pMouseOverTooltip, "" );
Assert( iPanelIndex == (m_pItemModelPanels.Count()-1) );
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CBaseLoadoutPanel::CreateItemPanels( void )
{
int iNumPanels = GetNumItemPanels();
if ( m_pItemModelPanels.Count() < iNumPanels )
{
for ( int i = m_pItemModelPanels.Count(); i < iNumPanels; i++ )
{
AddNewItemPanel(i);
}
}
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CBaseLoadoutPanel::ShowPanel( int iClass, bool bBackpack, bool bReturningFromArmory )
{
bool bShow = (iClass != 0 || bBackpack);
OnShowPanel( bShow, bReturningFromArmory );
SetVisible( bShow );
if ( bShow )
{
HideMouseOverPanel();
CreateItemPanels();
UpdateModelPanels();
// make the first slot be selected so controller input will work
static ConVarRef joystick( "joystick" );
if( joystick.IsValid() && joystick.GetBool() && m_pItemModelPanels.Count() && m_pItemModelPanels[0] )
{
m_pItemModelPanels[0]->SetSelected( true );
m_pItemModelPanels[0]->RequestFocus();
}
}
else
{
// clear items from panels to make sure that items get invalidate on show panel
FOR_EACH_VEC( m_pItemModelPanels, i )
{
m_pItemModelPanels[i]->SetItem( NULL );
}
}
if ( !bReturningFromArmory )
{
PostShowPanel( bShow );
}
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CBaseLoadoutPanel::OnCommand( const char *command )
{
engine->ClientCmd( const_cast<char *>( command ) );
BaseClass::OnCommand( command );
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CBaseLoadoutPanel::FireGameEvent( IGameEvent *event )
{
// If we're not visible, ignore all events
if ( !IsVisible() )
return;
const char *type = event->GetName();
if ( Q_strcmp( "inventory_updated", type ) == 0 )
{
// We need to refresh our model panels, because the items may have changed.
UpdateModelPanels();
}
}
CItemModelPanel *CBaseLoadoutPanel::FindBestPanelNavigationForDirection( const CItemModelPanel *pCurrentPanel, const Vector2D &vPos, const Vector2D &vDirection )
{
CItemModelPanel *pBestPanel = NULL;
// Start with the worst allowable score
float flDistance = GetWide() + GetTall();
float flDot = -1.0f;
float flClosenessScore = flDistance * ( 1.5f - flDot );
for ( int j = 0; j < m_pItemModelPanels.Count(); j++ )
{
CItemModelPanel *pTempPanel = m_pItemModelPanels[ j ];
if ( !pTempPanel || pTempPanel == pCurrentPanel )
continue;
// Get temp center position
int nX, nY;
pTempPanel->GetPos( nX, nY );
nX += pTempPanel->GetWide() / 2;
nY += pTempPanel->GetTall() / 2;
Vector2D vTempPos( nX, nY );
// Get distance and dot
Vector2D vDiff = vTempPos - vPos;
float flTempDistance = Vector2DNormalize( vDiff );
float flTempDot = vDiff.Dot( vDirection );
// Must be somewhat in the correct direction
if ( flTempDot <= 0.0f )
continue;
float flTempScore = flTempDistance * ( 1.5f - flTempDot );
if ( flClosenessScore > flTempScore )
{
flClosenessScore = flTempScore;
flDistance = flTempDistance;
flDot = flTempDot;
pBestPanel = pTempPanel;
}
}
return pBestPanel;
}
void CBaseLoadoutPanel::LinkModelPanelControllerNavigation( bool bForceRelink )
{
if ( m_pItemModelPanels.Count() < 2 )
return;
// first unlink everything
if( bForceRelink )
{
for ( int i = 0; i < m_pItemModelPanels.Count(); i++ )
{
CItemModelPanel *pCurrentPanel = m_pItemModelPanels[ i ];
if ( !pCurrentPanel )
continue;
pCurrentPanel->SetNavUp( (vgui::Panel*)NULL );
pCurrentPanel->SetNavDown( (vgui::Panel*)NULL );
pCurrentPanel->SetNavLeft( (vgui::Panel*)NULL );
pCurrentPanel->SetNavRight( (vgui::Panel*)NULL );
}
}
for ( int i = 0; i < m_pItemModelPanels.Count(); i++ )
{
CItemModelPanel *pCurrentPanel = m_pItemModelPanels[ i ];
if ( !pCurrentPanel )
continue;
// Get center position
int nX, nY;
pCurrentPanel->GetPos( nX, nY );
nX += pCurrentPanel->GetWide() / 2;
nY += pCurrentPanel->GetTall() / 2;
Vector2D vPos( nX, nY );
if ( !pCurrentPanel->GetNavUpName() || pCurrentPanel->GetNavUpName()[ 0 ] == '\0' )
{
CItemModelPanel *pBestPanel = FindBestPanelNavigationForDirection( pCurrentPanel, vPos, Vector2D( 0, -1 ) );
if ( pBestPanel )
{
pCurrentPanel->SetNavUp( pBestPanel->GetName() );
pBestPanel->SetNavDown( pCurrentPanel->GetName() );
}
}
if ( !pCurrentPanel->GetNavDownName() || pCurrentPanel->GetNavDownName()[ 0 ] == '\0' )
{
CItemModelPanel *pBestPanel = FindBestPanelNavigationForDirection( pCurrentPanel, vPos, Vector2D( 0, 1 ) );
if ( pBestPanel )
{
pCurrentPanel->SetNavDown( pBestPanel->GetName() );
pBestPanel->SetNavUp( pCurrentPanel->GetName() );
}
}
if ( !pCurrentPanel->GetNavLeftName() || pCurrentPanel->GetNavLeftName()[ 0 ] == '\0' )
{
CItemModelPanel *pBestPanel = FindBestPanelNavigationForDirection( pCurrentPanel, vPos, Vector2D( -1, 0 ) );
if ( pBestPanel )
{
pCurrentPanel->SetNavLeft( pBestPanel->GetName() );
pBestPanel->SetNavRight( pCurrentPanel->GetName() );
}
}
if ( !pCurrentPanel->GetNavRightName() || pCurrentPanel->GetNavRightName()[ 0 ] == '\0' )
{
CItemModelPanel *pBestPanel = FindBestPanelNavigationForDirection( pCurrentPanel, vPos, Vector2D( 1, 0 ) );
if ( pBestPanel )
{
pCurrentPanel->SetNavRight( pBestPanel->GetName() );
pBestPanel->SetNavLeft( pCurrentPanel->GetName() );
}
}
}
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CBaseLoadoutPanel::OnItemPanelEntered( vgui::Panel *panel )
{
CItemModelPanel *pItemPanel = dynamic_cast < CItemModelPanel * > ( panel );
if ( pItemPanel && IsVisible() )
{
CEconItemView *pItem = pItemPanel->GetItem();
if ( pItem && !IsIgnoringItemPanelEnters() && !pItemPanel->IsGreyedOut() )
{
m_pItemPanelBeingMousedOver = pItemPanel;
}
if ( !pItemPanel->IsSelected() )
{
SetBorderForItem( pItemPanel, true );
}
}
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CBaseLoadoutPanel::OnItemPanelExited( vgui::Panel *panel )
{
CItemModelPanel *pItemPanel = dynamic_cast < CItemModelPanel * > ( panel );
if ( pItemPanel && IsVisible() )
{
if ( !pItemPanel->IsSelected() )
{
SetBorderForItem( pItemPanel, false );
}
}
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CBaseLoadoutPanel::HideMouseOverPanel( void )
{
if ( m_pMouseOverItemPanel->IsVisible() )
{
m_pMouseOverItemPanel->SetVisible( false );
m_pItemPanelBeingMousedOver = NULL;
}
#ifdef STAGING_ONLY
if ( m_pMouseOverCardPanel->IsVisible() )
{
m_pMouseOverCardPanel->SetVisible( false );
m_pItemPanelBeingMousedOver = NULL;
}
#endif
}
//-----------------------------------------------------------------------------
// Purpose: Returns the index of the first selected item.
//-----------------------------------------------------------------------------
int CBaseLoadoutPanel::GetFirstSelectedItemIndex( bool bIncludeEmptySlots )
{
for ( int i = 0; i < m_pItemModelPanels.Count(); i++ )
{
if ( m_pItemModelPanels[i]->IsSelected() && ( bIncludeEmptySlots || m_pItemModelPanels[i]->HasItem() ) )
{
return i;
}
}
return -1;
}
//-----------------------------------------------------------------------------
// Purpose: Returns the first selected item model panel or NULL if there is no
// such panel.
//-----------------------------------------------------------------------------
CItemModelPanel *CBaseLoadoutPanel::GetFirstSelectedItemModelPanel (bool bIncludeEmptySlots )
{
int i = GetFirstSelectedItemIndex( bIncludeEmptySlots );
if( i == -1 )
return NULL;
else
return m_pItemModelPanels[ i ];
}
//-----------------------------------------------------------------------------
// Purpose: Returns the first selected econ item view or NULL if there is no
// selected item
//-----------------------------------------------------------------------------
CEconItemView *CBaseLoadoutPanel::GetFirstSelectedItem()
{
CItemModelPanel *pItemModelPanel = GetFirstSelectedItemModelPanel( false );
if( pItemModelPanel )
return pItemModelPanel->GetItem();
else
return NULL;
}
//-----------------------------------------------------------------------------
// Purpose: Returns the next item in the specified direction, possibly switching
// pages to get there
//-----------------------------------------------------------------------------
bool CBaseLoadoutPanel::GetAdjacentItemIndex( int nIndex, int nPage, int *pnNewIndex, int *pnNewPage, int dx, int dy )
{
// if we don't have a valid index the right answer is always the first item on the first page
if( nIndex == -1 )
{
*pnNewIndex = 0;
*pnNewPage = nPage;
return true;
}
int nRow = nIndex / GetNumColumns() + dy;
int nColumn = nIndex % GetNumColumns() + dx;
// just limit us to the top and bottom edges
if( nRow < 0 || nRow >= GetNumRows() )
return false;
// for columns, try to switch pages
int nNewPage = nPage;
while( nColumn < 0 )
{
if( nNewPage == 0 )
break;
nNewPage--;
nColumn += GetNumColumns();
}
while( nColumn >= GetNumColumns() )
{
if( nNewPage == GetNumPages() - 1 )
break;
nNewPage++;
nColumn -= GetNumColumns();
}
if( nColumn < 0 )
{
if( nNewPage != nPage )
{
nColumn = 0;
}
else
{
return false;
}
}
else if( nColumn >= GetNumColumns() )
{
if( nNewPage != nPage )
{
nColumn = GetNumColumns() - 1;
}
else
{
return false;
}
}
// never change to an invisible panel
int nNewIndex = nRow * GetNumColumns() + nColumn;
if( nNewIndex >= m_pItemModelPanels.Count() || !m_pItemModelPanels[ nNewIndex ]->IsVisible() )
{
// try to find a model panel that's still valid so we find the last one on the last valid row
while( nNewIndex >= 0 && !m_pItemModelPanels[ nNewIndex ]->IsVisible() )
nNewIndex--;
if( nNewIndex < 0 || nNewIndex == nIndex )
return false;
}
*pnNewPage = nNewPage;
*pnNewIndex = nNewIndex;
return true;
}
//-----------------------------------------------------------------------------
// Purpose: selects the next item in the specified direction, possibly switching
// pages to get there
//-----------------------------------------------------------------------------
void CBaseLoadoutPanel::SelectAdjacentItem( int dx, int dy )
{
int nSelected = GetFirstSelectedItemIndex( true );
int nNewPage, nNewSelected;
bool bFoundNext = GetAdjacentItemIndex( nSelected, m_nCurrentPage, &nNewSelected, &nNewPage, dx, dy );
if( !bFoundNext )
{
vgui::surface()->PlaySound( "player/suit_denydevice.wav" );
return;
}
// change pages
if( nNewPage != m_nCurrentPage )
{
Assert( nNewPage >= 0 && nNewPage < GetNumPages() );
SetCurrentPage( nNewPage );
UpdateModelPanels();
}
// select the new model
if( nSelected != nNewSelected )
{
if( nSelected != -1 && m_pItemModelPanels[ nSelected ]->IsSelected() )
{
m_pItemModelPanels[ nSelected ]->SetSelected( false );
SetBorderForItem( m_pItemModelPanels[ nSelected ], false );
}
if( nNewSelected != -1 && !m_pItemModelPanels[ nNewSelected ]->IsSelected() )
{
m_pItemModelPanels[ nNewSelected ]->SetSelected( true );
SetBorderForItem( m_pItemModelPanels[ nNewSelected ], false );
if( m_bTooltipKeyPressed )
{
if( m_pItemModelPanels[ nNewSelected ]->HasItem() )
{
m_pMouseOverTooltip->ShowTooltip( m_pItemModelPanels[ nNewSelected ] );
}
else
{
m_pMouseOverTooltip->HideTooltip();
}
}
}
}
OnItemSelectionChanged();
}
//-----------------------------------------------------------------------------
// Purpose: Processes up/down/left/right keys for selecting items in the panel
//-----------------------------------------------------------------------------
bool CBaseLoadoutPanel::HandleItemSelectionKeyPressed( vgui::KeyCode code )
{
ButtonCode_t nButtonCode = GetBaseButtonCode( code );
if ( nButtonCode == KEY_XBUTTON_UP ||
nButtonCode == KEY_XSTICK1_UP ||
nButtonCode == KEY_XSTICK2_UP ||
nButtonCode == KEY_UP )
{
SelectAdjacentItem( 0, -1 );
return true;
}
else if ( nButtonCode == KEY_XBUTTON_DOWN ||
nButtonCode == KEY_XSTICK1_DOWN ||
nButtonCode == KEY_XSTICK2_DOWN ||
nButtonCode == STEAMCONTROLLER_DPAD_DOWN ||
nButtonCode == KEY_DOWN )
{
SelectAdjacentItem( 0, 1 );
return true;
}
else if ( nButtonCode == KEY_XBUTTON_RIGHT ||
nButtonCode == KEY_XSTICK1_RIGHT ||
nButtonCode == KEY_XSTICK2_RIGHT ||
nButtonCode == STEAMCONTROLLER_DPAD_RIGHT ||
nButtonCode == KEY_RIGHT )
{
SelectAdjacentItem( 1, 0 );
return true;
}
else if ( nButtonCode == KEY_XBUTTON_LEFT ||
nButtonCode == KEY_XSTICK1_LEFT ||
nButtonCode == KEY_XSTICK2_LEFT ||
nButtonCode == STEAMCONTROLLER_DPAD_LEFT ||
nButtonCode == KEY_LEFT )
{
SelectAdjacentItem( -1, 0 );
return true;
}
else if ( code == KEY_PAGEDOWN ||
nButtonCode == KEY_XBUTTON_RIGHT_SHOULDER )
{
if( m_nCurrentPage < GetNumPages() - 1 )
{
SetCurrentPage( m_nCurrentPage + 1 );
UpdateModelPanels();
}
return true;
}
else if ( code == KEY_PAGEUP ||
nButtonCode == KEY_XBUTTON_LEFT_SHOULDER )
{
if( m_nCurrentPage > 0 )
{
SetCurrentPage( m_nCurrentPage - 1 );
UpdateModelPanels();
}
return true;
}
else if ( nButtonCode == KEY_XBUTTON_Y )
{
m_bTooltipKeyPressed = true;
CItemModelPanel *pSelection = GetFirstSelectedItemModelPanel( false );
if( pSelection )
{
m_pMouseOverTooltip->ResetDelay();
m_pMouseOverTooltip->ShowTooltip( pSelection );
}
return true;
}
else
{
return false;
}
}
//-----------------------------------------------------------------------------
// Purpose: Processes up/down/left/right keys for selecting items in the panel
//-----------------------------------------------------------------------------
bool CBaseLoadoutPanel::HandleItemSelectionKeyReleased( vgui::KeyCode code )
{
ButtonCode_t nButtonCode = GetBaseButtonCode( code );
if( nButtonCode == KEY_XBUTTON_Y )
{
m_bTooltipKeyPressed = false;
m_pMouseOverTooltip->HideTooltip();
return true;
}
else
{
return false;
}
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CBaseLoadoutPanel::SetCurrentPage( int nNewPage )
{
if( nNewPage < 0 || nNewPage >= GetNumPages() )
return;
m_nCurrentPage = nNewPage;
}