// XTPExcelTabCtrl.cpp : implementation of the CXTPExcelTabCtrl class.
//
// This file is a part of the XTREME CONTROLS MFC class library.
// (c)1998-2012 Codejock Software, All Rights Reserved.
//
// THIS SOURCE FILE IS THE PROPERTY OF CODEJOCK SOFTWARE AND IS NOT TO BE
// RE-DISTRIBUTED BY ANY MEANS WHATSOEVER WITHOUT THE EXPRESSED WRITTEN
// CONSENT OF CODEJOCK SOFTWARE.
//
// THIS SOURCE CODE CAN ONLY BE USED UNDER THE TERMS AND CONDITIONS OUTLINED
// IN THE XTREME TOOLKIT PRO LICENSE AGREEMENT. CODEJOCK SOFTWARE GRANTS TO
// YOU (ONE SOFTWARE DEVELOPER) THE LIMITED RIGHT TO USE THIS SOFTWARE ON A
// SINGLE COMPUTER.
//
// CONTACT INFORMATION:
// support@codejock.com
// http://www.codejock.com
//
/////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "../Resource.h"

#include "Common/XTPResourceManager.h"
#include "Common/XTPColorManager.h"
#include "Common/XTPDrawHelpers.h"

#include "../Defines.h"
#include "../Util/XTPGlobal.h"
#include "../Util/XTPControlTheme.h"
#include "XTPExcelTabCtrl.h"
#include "XTPExcelTabCtrlTheme.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

static const int GRIPPER_WIDTH = 6;

static const int BUTTON_COUNT = 4;

#define XTP_IDC_BTN_LEFT                 100
#define XTP_IDC_BTN_RIGHT                101
#define XTP_IDC_BTN_HOME                 102
#define XTP_IDC_BTN_END                  103

/////////////////////////////////////////////////////////////////////////////
// CXTPExcelTabCtrlButtonState

CXTPExcelTabCtrlButtonState::CXTPExcelTabCtrlButtonState()
: m_rect(0, 0, 0, 0)
, m_bPressed(false)
, m_bEnabled(true)
, m_bHilight(false)
{
	m_iCommand = 0;
}

void CXTPExcelTabCtrlButtonState::SetInfo(CRect rect, int iCommand, XTPArrowIcon iconType)
{
	m_rect = rect;
	m_iCommand = iCommand;
	m_IconType = iconType;
}

/////////////////////////////////////////////////////////////////////////////
// CXTPExcelTabCtrl

CXTPExcelTabCtrl::CXTPExcelTabCtrl()
: m_iBtnLeft(-1)
, m_iBtnRight(-1)
, m_iBtnHome(-1)
, m_iBtnEnd(-1)
, m_bPainted(false)
, m_iBtnHilight(-1)
, m_pTheme(NULL)
, m_bSubclassed(TRUE)
{
	m_dwStyle = NULL;
	m_nCurSel = -1;
	m_nOffset = 0;
	m_nClientWidth = 0;
	m_nClientHeight = 0;
	m_pNormFont = &XTPAuxData().font;
	m_pBoldFont = &XTPAuxData().fontBold;
	m_bManagingViews = false;
	m_rectGripper = CRect(0, 0, 0, 0);
	m_bTracking = false;
	m_bUserColors = false;
	m_pWndLastFocus = NULL;
	m_iGripperPosPerCent = 0;
	m_xGripperPos = -1;

	// Initialize the width and height for the left, right, home
	// and end buttons.
	m_cy = ::GetSystemMetrics(SM_CYHSCROLL);
	m_cx = ::GetSystemMetrics(SM_CXHSCROLL)-1;

	UpdateDefaultColors();

	// Create the icons used by the left, right, home and end buttons.
	CreateButtonIcons();

	VERIFY(SetTheme(xtpControlThemeDefault));
}

CXTPExcelTabCtrl::~CXTPExcelTabCtrl()
{
	CMDTARGET_RELEASE(m_pTheme);

	// Cleanup
	ClearAllItems();
	FreeButtonIcons();
}

IMPLEMENT_DYNAMIC(CXTPExcelTabCtrl, CWnd)

BEGIN_MESSAGE_MAP(CXTPExcelTabCtrl, CWnd)
	//{{AFX_MSG_MAP(CXTPExcelTabCtrl)
	ON_WM_CREATE()
	ON_WM_PAINT()
	ON_MESSAGE(WM_PRINTCLIENT, OnPrintClient)
	ON_WM_ERASEBKGND()
	ON_BN_CLICKED(XTP_IDC_BTN_LEFT, OnLeftArrow)
	ON_BN_CLICKED(XTP_IDC_BTN_RIGHT, OnRightArrow)
	ON_BN_CLICKED(XTP_IDC_BTN_HOME, OnHomeArrow)
	ON_BN_CLICKED(XTP_IDC_BTN_END, OnEndArrow)
	ON_WM_SIZE()
	ON_WM_LBUTTONDOWN()
	ON_WM_MOUSEMOVE()
	ON_WM_SETCURSOR()
	ON_WM_LBUTTONUP()
	ON_WM_LBUTTONDBLCLK()
	ON_WM_HSCROLL()
	ON_WM_TIMER()
	//}}AFX_MSG_MAP
	ON_MESSAGE(WM_XTP_SETCONTROLTHEME, OnSetTheme)
END_MESSAGE_MAP()

void CXTPExcelTabCtrl::RefreshMetrics()
{
	if (m_pTheme)
		m_pTheme->RefreshMetrics(this);

	if (::IsWindow(m_hWnd))
		RedrawWindow();
}

BOOL CXTPExcelTabCtrl::SetTheme(XTPControlTheme eTheme)
{
	CMDTARGET_RELEASE(m_pTheme);

	switch (eTheme)
	{
		case xtpControlThemeOfficeXP:
			m_pTheme = new CXTPExcelTabCtrlThemeOfficeXP;
			break;

		case xtpControlThemeOffice2003:
			m_pTheme = new CXTPExcelTabCtrlThemeOffice2003;
			break;

		default:
			m_pTheme = new CXTPExcelTabCtrlTheme;
			break;
	}

	RefreshMetrics();

	return (m_pTheme != NULL);
}

LRESULT CXTPExcelTabCtrl::OnSetTheme(WPARAM wParam, LPARAM /*lParam*/)
{
	XTPControlTheme eTheme = (XTPControlTheme)wParam;

	SetTheme(eTheme);

	return 0;
}

BOOL CXTPExcelTabCtrl::Init()
{
	if (SetTheme(xtpControlThemeDefault))
	{
		if (m_bSubclassed)
		{
			m_dwStyle = ::GetWindowLong(m_hWnd, GWL_STYLE);

			CXTPClientRect rect(this);
			m_nClientWidth = rect.Width();
			m_nClientHeight = rect.Height();
		}

		SetTabStyle(m_dwStyle);

		return TRUE;
	}

	return FALSE;
}

BOOL CXTPExcelTabCtrl::OnWndMsg(UINT message, WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
	if (message == WM_SETTINGCHANGE || message == WM_SYSCOLORCHANGE)
	{
		RefreshMetrics();
	}

	return CWnd::OnWndMsg(message, wParam, lParam, pResult);
}

void CXTPExcelTabCtrl::PreSubclassWindow()
{
	CWnd::PreSubclassWindow();

	if (m_bSubclassed)
	{
		// Initialize the control.
		Init();
	}
}

BOOL CXTPExcelTabCtrl::PreCreateWindow(CREATESTRUCT& cs)
{
	if (!CWnd::PreCreateWindow(cs))
		return FALSE;

	// When creating controls dynamically Init() must
	// be called from OnCreate() and not from
	// PreSubclassWindow().

	m_bSubclassed = FALSE;

	return TRUE;
}


BOOL CXTPExcelTabCtrl::Create(DWORD dwStyle, const CRect& rect, CWnd* pParentWnd, UINT nID)
{
	ASSERT(pParentWnd != NULL); // must be valid.

	// Call the base class for creation.
	if (!CWnd::Create(NULL, NULL, dwStyle, rect, pParentWnd, nID))
	{
		TRACE0("Failed to create flat tab control.\n");
		return FALSE;
	}

	return TRUE;
}

int CXTPExcelTabCtrl::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	if (CWnd::OnCreate(lpCreateStruct) == -1)
		return -1;

	// Save the window style.
	m_dwStyle = lpCreateStruct->style;
	m_nClientWidth = lpCreateStruct->cx;
	m_nClientHeight = lpCreateStruct->cy;

	// Initialize the control.
	Init();

	return 0;
}

void CXTPExcelTabCtrl::SetGripperPosition(int x, bool bPercent)
{
	// only valid for tabs with horizontal scroll bars
	if (!(m_dwStyle & FTS_XTP_HSCROLL)) return;

	int x_percent;
	if (bPercent)
	{
		x_percent = x;
		x = m_nClientWidth * x / 100;
	}
	else
	{
		x_percent = x * 100 / m_nClientWidth;
	}

	// too far to the left ?
	const int arrowWidth = 0; //GetTotalArrowWidth();
	if (x < arrowWidth) x = arrowWidth;

	// too far to the right ?
	const int sbExtreme = (m_nClientWidth - 4 * m_cx - m_cy);
	if (x > sbExtreme) x = sbExtreme;

	m_xGripperPos = x;
	m_iGripperPosPerCent = x_percent;

	m_rectGripper = m_rectTabs;
	m_rectGripper.left += x;
	m_rectGripper.right = m_rectGripper.left + GRIPPER_WIDTH;

	const int isbottom = ((m_dwStyle & FTS_XTP_BOTTOM) == FTS_XTP_BOTTOM);
	m_rectSB_H = CRect(
		m_rectGripper.right,
		m_rectTabs.top - !isbottom,
		m_rectTabs.right - m_cy,
		m_rectTabs.bottom + isbottom);
	m_wndHScrollBar.MoveWindow(m_rectSB_H);

	EnableButtons();
	InvalidateRect(m_rectTabs);
}

void CXTPExcelTabCtrl::SetTabStyle(DWORD dwStyle)
{
	m_dwStyle = dwStyle;

	if (!GetSafeHwnd())
		return;

	if (m_dwStyle & FTS_XTP_HASHOMEEND) m_dwStyle |= FTS_XTP_HASARROWS;

	// If we use tooltips, create the control.
	if (m_dwStyle & FTS_XTP_TOOLTIPS)
	{
		if (m_ToolTip.GetSafeHwnd() == 0)
		{
			CString strTipText;
			XTPResourceManager()->LoadString(&strTipText, XTP_IDS_TIPTEXT);

			m_ToolTip.Create(this);
			m_ToolTip.Activate(TRUE);
			m_ToolTip.AddTool(this, strTipText);
			m_ToolTip.SendMessage(TTM_SETMAXTIPWIDTH, 0, SHRT_MAX); // Allow multi line tooltips
		}
	}
	else
	{
		m_ToolTip.DestroyWindow();
	}

	CRect rectDummy(0, 0, 0, 0);

	// If we use arrow buttons, create the buttons.
	if (m_dwStyle & FTS_XTP_HASARROWS)
	{
		int nIndex = 0;

		// Create the home button.
		if (m_dwStyle & FTS_XTP_HASHOMEEND)
		{
			m_buttons[nIndex].SetInfo(rectDummy, XTP_IDC_BTN_HOME,
				xtpArrowIconLeftHome);
			m_iBtnHome = nIndex;
			++nIndex;
		}
		else
		{
			m_iBtnHome = 3;
		}

		// Create the left button.
		m_buttons[nIndex].SetInfo(rectDummy, XTP_IDC_BTN_LEFT, xtpArrowIconLeft);
		m_iBtnLeft = nIndex;
		++nIndex;

		// Create the right button.
		m_buttons[nIndex].SetInfo(rectDummy, XTP_IDC_BTN_RIGHT, xtpArrowIconRight);
		m_iBtnRight = nIndex;
		++nIndex;

		// Create the end button.
		if (m_dwStyle & FTS_XTP_HASHOMEEND)
		{
			m_buttons[nIndex].SetInfo(rectDummy, XTP_IDC_BTN_END,
				xtpArrowIconRightHome);
			m_iBtnEnd = nIndex;
			++nIndex;
		}
		else
		{
			m_iBtnEnd = 3;
		}

	}

	if (m_dwStyle & FTS_XTP_HSCROLL)
	{
		if (m_wndHScrollBar.GetSafeHwnd() == 0)
		{
			CRect rc(0, 0, 0, 0);
			VERIFY(m_wndHScrollBar.Create(WS_VISIBLE | WS_CHILD | SBS_HORZ,
				rc, this, AFX_IDW_HSCROLL_FIRST));
			SetGripperPosition(60, true);
		}
	}
	else
	{
		m_wndHScrollBar.DestroyWindow();
		m_rectSB_H = CRect(0, 0, 0, 0);
	}

	RecalcLayout();
	SetGripperPosition(m_iGripperPosPerCent, true);

	RedrawWindow();

}


int CXTPExcelTabCtrl::GetGripperPosition() const
{
	return m_xGripperPos;
}


BOOL CXTPExcelTabCtrl::OnEraseBkgnd(CDC* pDC)
{
	if (GetItemCount() == 0)
	{
		pDC->FillSolidRect(m_rectViews, GetXtremeColor(COLOR_3DFACE));
	}
	return TRUE;
}

void CXTPExcelTabCtrl::CreateButtonIcons()
{
	// obsolete
}

void CXTPExcelTabCtrl::FreeButtonIcons()
{
	// obsolete
}

int CXTPExcelTabCtrl::GetTabWidth(int nItem) const
{
	CDC *pDC = CDC::FromHandle(::GetDC(m_hWnd));

	CFont* pOldFont = pDC->SelectObject((m_nCurSel == nItem) ?
		m_pBoldFont : m_pNormFont);

	CSize size = pDC->GetTextExtent(m_tcbItems[nItem]->szTabLabel);
	pDC->SelectObject(pOldFont);

	::ReleaseDC(m_hWnd, pDC->m_hDC);

	return size.cx + m_cy + (m_cy / 2);
}

int CXTPExcelTabCtrl::GetTotalTabWidth() const
{
	int iWidth = 0;
	const int cItems = GetItemCount();
	const int iOverlap = GetOverlap();
	int i;
	for (i = 0; i < cItems; i++)
	{
		iWidth += GetTabWidth(i);
		if (i != 0)
		{
			iWidth -= iOverlap;
		}
	}
	return iWidth;
}

int CXTPExcelTabCtrl::GetTotalArrowWidth() const
{
	int iWidth = 0;

	if (m_dwStyle & FTS_XTP_HASARROWS)
		iWidth += (m_cx * 2);

	if (m_dwStyle & FTS_XTP_HASHOMEEND)
		iWidth += (m_cx * 2);

	return iWidth;
}

int CXTPExcelTabCtrl::GetTotalTabAreaWidth() const
{
	int iWidth;
	if (m_dwStyle & FTS_XTP_HSCROLL)
	{
		iWidth = m_xGripperPos;
	}
	else
	{
		iWidth = m_nClientWidth;
	}
	iWidth -= GetTotalArrowWidth();
	return iWidth;
}

void CXTPExcelTabCtrl::InvalidateTabs()
{
	if (GetSafeHwnd())
	{
		// invalidate the visible tab area
		// to minimize flicker - don't erase the background
		CRect rcTabs;

		rcTabs.left = GetTotalArrowWidth();
		rcTabs.top = m_rectTabs.top;
		rcTabs.right = rcTabs.left + (GetTotalTabWidth() - m_nOffset);
		rcTabs.bottom = m_rectTabs.bottom;
		InvalidateRect(&rcTabs, FALSE);

		// invalidate the blank area to the right of the tabs
		if (rcTabs.right < m_nClientWidth)
		{
			rcTabs.left = rcTabs.right;
			rcTabs.right = m_nClientWidth;
			InvalidateRect(&rcTabs, TRUE);
		}
	}
}

void CXTPExcelTabCtrl::EnableButtons()
{
	if (m_dwStyle & FTS_XTP_HASARROWS)
	{
		m_buttons[m_iBtnLeft].m_bEnabled = (m_nOffset > 0);
		m_buttons[m_iBtnRight].m_bEnabled =
			(GetTotalTabWidth() - m_nOffset > GetTotalTabAreaWidth() - 1);

		if (m_dwStyle & FTS_XTP_HASHOMEEND)
		{
			m_buttons[m_iBtnHome].m_bEnabled = m_buttons[m_iBtnLeft].m_bEnabled;
			m_buttons[m_iBtnEnd].m_bEnabled = m_buttons[m_iBtnRight].m_bEnabled;
		}

		CRect rc = m_buttons[m_iBtnLeft].m_rect;
		rc.left = 0;
		rc.right = GetTotalArrowWidth();
		InvalidateRect(rc);
	}
	else
	{
		InvalidateRect(CRect(0, 0, GetTotalArrowWidth(), m_nClientHeight));
	}
}

BOOL CXTPExcelTabCtrl::GetItemRect(int nItem, LPRECT lpRect)
{
	const int cItems = GetItemCount();
	if (nItem < 0 || nItem >= cItems)
		return FALSE;

	const int iOverlap = GetOverlap();
	int x = GetTotalArrowWidth();
	int i;
	for (i = 0; i < nItem; i++)
	{
		x += GetTabWidth(i) - iOverlap;
	}
	lpRect->left = x - m_nOffset;
	lpRect->top = m_rectTabs.top;
	lpRect->right = lpRect->left + GetTabWidth(nItem);
	lpRect->bottom = m_rectTabs.bottom;
	return TRUE;
}

void CXTPExcelTabCtrl::ResetMouseOver()
{
	for (int i = 0; i < BUTTON_COUNT; ++i)
	{
		m_buttons[i].m_bHilight = false;
	}
}

int CXTPExcelTabCtrl::ButtonHitTest(CPoint& pt)
{
	ResetMouseOver();

	int i;
	for (i = 0; i < BUTTON_COUNT; ++i)
	{
		if (m_buttons[i].m_rect.PtInRect(pt))
		{
			m_buttons[i].m_bHilight = true;
			return i;
		}
	}

	return -1;
}

int CXTPExcelTabCtrl::HitTest(TCHITTESTINFO* pHitTestInfo) const
{
	// ignore hits on the buttons
	int iHitX = pHitTestInfo->pt.x;
	if (iHitX < GetTotalArrowWidth())
		return -1;

	// on or to the right of the the scroll bar/gripper ?
	if ((m_dwStyle & FTS_XTP_HSCROLL) && iHitX > m_rectGripper.left)
	{
		return -1;
	}

	const int iOverlap = GetOverlap();

	// check if any tabs were hit
	int x = GetTotalArrowWidth() - m_nOffset;
	const int cItems = GetItemCount();
	int i;
	for (i = 0; i < cItems; i++)
	{
		int iTabWidth = GetTabWidth(i);
		if (i != cItems - 1)
		{
			iTabWidth -= iOverlap;
		}
		if ((x <= iHitX) && (iHitX <= x + iTabWidth))
		{
			return i;
		}
		x += iTabWidth;
	}

	// hit point is right of rightmost tab
	return -1;
}

void CXTPExcelTabCtrl::OnLeftArrow()
{
	// Move the tabs right, ensuring that we move right by one
	// whole tab each time ala Microsoft Access

	CPoint Point(GetTotalArrowWidth() + 1 + GetOverlap(), 1);

	TCHITTESTINFO htInfo;
	htInfo.pt = Point;
	int iTab = HitTest(&htInfo);

	if (iTab != -1)
	{
		m_nOffset = 0;
		RECT rect;
		if (GetItemRect(iTab - 1, &rect))
		{
			m_nOffset += rect.left;
			m_nOffset -= GetTotalArrowWidth();
			EnableButtons();
			InvalidateTabs();
		}
	}
}

void CXTPExcelTabCtrl::OnRightArrow()
{
	// Move the tabs left, ensuring that we move left by one
	// whole tab each time ala Microsoft Access

	CPoint Point(GetTotalArrowWidth()+ 1 + GetOverlap(), 1);

	TCHITTESTINFO htInfo;
	htInfo.pt = Point;
	int iTab = HitTest(&htInfo);

	if (iTab != -1)
	{
		RECT rect;
		if (GetItemRect(iTab + 1, &rect))
		{
			m_nOffset += rect.left - GetTotalArrowWidth();
			EnableButtons();
			InvalidateTabs();
		}
	}
}

void CXTPExcelTabCtrl::OnHomeArrow()
{
	m_nOffset = 0;
	EnableButtons();
	InvalidateTabs();
}

void CXTPExcelTabCtrl::OnEndArrow()
{
	m_nOffset = GetTotalTabWidth() - GetTotalTabAreaWidth() + 1;
	EnableButtons();
	InvalidateTabs();
}

void CXTPExcelTabCtrl::OnSize(UINT nType, int cx, int cy)
{
	CWnd::OnSize(nType, cx, cy);

	m_nClientWidth = cx;
	m_nClientHeight = cy;

	RecalcLayout();
	SetGripperPosition(m_iGripperPosPerCent, true);
	SyncScrollBar();
}

int CXTPExcelTabCtrl::InsertItem(int nItem, LPCTSTR lpszItem, CWnd* pWndControl)
{
	const int cItems = GetItemCount();
	if (nItem < 0 || nItem > cItems)
		return -1;

	if (pWndControl)
	{
		ASSERT(::IsWindow(pWndControl->m_hWnd));

		// managed view should be a hidden child
		ASSERT((::GetWindowLong(pWndControl->m_hWnd, GWL_STYLE) & (WS_VISIBLE | WS_CHILD)) == WS_CHILD);

		// can't have both managed and non-managed tabs
		ASSERT(m_bManagingViews || cItems == 0);

		m_bManagingViews = true;

		pWndControl->SetParent(this);
		pWndControl->SetWindowPos(NULL, m_rectViews.left, m_rectViews.top,
			m_rectViews.Width(), m_rectViews.Height(),
			SWP_NOZORDER | SWP_NOREDRAW);
	}

	// Allocate a new CXTPTcbItem object.
	CXTPTcbItem* pMember = new CXTPTcbItem;
	if (pMember == NULL)
		return -1;

	pMember->pWnd = pWndControl;
	pMember->szTabLabel = lpszItem;
	pMember->szToolTipLabel = lpszItem;
	pMember->uiToolTipId = GetItemCount();

	if (nItem <= m_nCurSel) ++m_nCurSel;

	// Add the new CXTPTcbItem to the tab item list.
	m_tcbItems.InsertAt(nItem, pMember);

	if (m_nCurSel < 0) m_nCurSel = 0;
	EnableButtons();
	InvalidateTabs();
	SetCurSel(nItem);

	return nItem;
}

BOOL CXTPExcelTabCtrl::_DeleteItem(int nItem)
{
	const int cItems = (int)m_tcbItems.GetSize();
	if (nItem < 0 || nItem >= cItems)
		return FALSE;

	// Remove the item from the string arrays.
	CWnd *pWndControl = m_tcbItems[nItem]->pWnd;
	if (::IsWindow(pWndControl->GetSafeHwnd()))
	{
		pWndControl->ShowWindow(SW_HIDE);
		pWndControl->SetParent(NULL);
	}
	SAFE_DELETE(m_tcbItems[nItem]);
	m_tcbItems.RemoveAt(nItem);
	if (m_tcbItems.GetSize() == 0)
	{
		m_bManagingViews = false;
	}
	return TRUE;
}

BOOL CXTPExcelTabCtrl::DeleteItem(int nItem)
{
	if (!_DeleteItem(nItem))
	{
		return FALSE;
	}

	const int cItems = GetItemCount();
	ASSERT(cItems >= 0);

	if (cItems == 0)
	{
		m_nCurSel = -1;
	}
	else
	{
		if (nItem == m_nCurSel)
		{
			m_nCurSel = 0;
			SetCurSel(0);
		}
		else if (m_nCurSel > nItem)
		{
			--m_nCurSel;
		}
	}

	EnableButtons();
	InvalidateTabs();

	return TRUE;
}

void CXTPExcelTabCtrl::ClearAllItems()
{
	while (_DeleteItem(0))
	{
	};
}

BOOL CXTPExcelTabCtrl::DeleteAllItems()
{
	ClearAllItems();

	// Reset the currently selected tab to -1 as we have no tabs in our list now.
	m_nCurSel = -1;

	EnableButtons();
	InvalidateTabs();

	return TRUE;
}

int CXTPExcelTabCtrl::SetCurSel(int nItem)
{
	const int cItems = GetItemCount();
	if (nItem < 0 || nItem >= cItems)
		return -1;

	int iPrevSel = m_nCurSel;
	m_nCurSel = nItem;

	// test if we need to center on the selected tab
	CRect rcItem;
	if (GetItemRect(nItem, &rcItem))
	{
		// test if the tab is off on the left
		int iTotalArrowWidth = GetTotalArrowWidth();
		rcItem.left -= iTotalArrowWidth;
		if (rcItem.left <= 0)
			m_nOffset += rcItem.left;
		else
		{
			// test if the tab is off on the right
			rcItem.right -= iTotalArrowWidth;
			int iTabAreaWidth = GetTotalTabAreaWidth();
			if (rcItem.right > iTabAreaWidth)
				m_nOffset += (rcItem.right - iTabAreaWidth);
		}
	}

	// hide/show managed controls
	ASSERT(iPrevSel >= 0);
	if (iPrevSel < cItems && m_tcbItems[iPrevSel]->pWnd->GetSafeHwnd())
	{
		m_tcbItems[iPrevSel]->pWnd->ShowWindow(SW_HIDE);
	}
	if (m_tcbItems[m_nCurSel]->pWnd->GetSafeHwnd())
	{
		m_tcbItems[m_nCurSel]->pWnd->ShowWindow(SW_SHOW);
	}

	// reset scroll bar position
	SyncScrollBar();

	EnableButtons();
	InvalidateTabs();

	return iPrevSel;
}

void CXTPExcelTabCtrl::OnLButtonDown(UINT nFlags, CPoint point)
{
	TCHITTESTINFO tchtinfo;
	tchtinfo.pt = point;

	// sizing grip ?
	if (m_rectGripper.PtInRect(point))
	{
		ASSERT(m_bTracking == false);
		SetTracking(true);
		return;
	}

	// on a button ?
	int iButton = ButtonHitTest(point);
	if (iButton >= 0)
	{
		CXTPExcelTabCtrlButtonState& b = m_buttons[iButton];
		if (b.m_bEnabled)
		{
			b.m_bPressed = true;
			RedrawWindow(b.m_rect);
			SetCapture();
		}
		return;
	}

	int iTab = HitTest(&tchtinfo);
	if ((iTab != -1) && (iTab != m_nCurSel))
	{
		// warn parent that the selection is about to change
		int id = GetDlgCtrlID();
		NMHDR hdr;
		hdr.hwndFrom = m_hWnd;
		hdr.idFrom = id;
		hdr.code = TCN_SELCHANGING;
		if (GetOwner()->SendMessage(WM_NOTIFY, id, (LPARAM)&hdr) == 0)
		{
			// parent has given permission for the selection to change
			SetCurSel(iTab);
			InvalidateTabs();

			// notify parent that the selection has changed
			hdr.hwndFrom = m_hWnd;
			hdr.idFrom = id;
			hdr.code = TCN_SELCHANGE;
			GetOwner()->SendMessage(WM_NOTIFY, id, (LPARAM)&hdr);
		}
	}

	CWnd::OnLButtonDown(nFlags, point);
}

void CXTPExcelTabCtrl::OnLButtonUp(UINT nFlags, CPoint point)
{
	if (m_bTracking)
	{
		SetTracking(false);
	}

	// on a button ?
	int i;
	for (i = 0; i < BUTTON_COUNT; ++i)
	{
		CXTPExcelTabCtrlButtonState& b = m_buttons[i];
		if (b.m_bEnabled & b.m_bPressed)
		{
			PostMessage(WM_COMMAND, b.m_iCommand, NULL);
			b.m_bPressed = false;
			RedrawWindow(b.m_rect);
			ReleaseCapture();
			return;
		}
	}

	CWnd::OnLButtonUp(nFlags, point);
}

void CXTPExcelTabCtrl::OnPaint()
{
	CPaintDC dc(this);

	if (m_dwStyle & FTS_XTP_HSCROLL)
	{
		dc.ExcludeClipRect(&m_rectSB_H);
	}

	CXTPBufferDC memDC(dc, m_rectTabs);
	OnDraw(&memDC);
}

LRESULT CXTPExcelTabCtrl::OnPrintClient(WPARAM wParam, LPARAM /*lParam*/)
{
	CDC* pDC = CDC::FromHandle((HDC)wParam);
	if (pDC)
	{
		OnDraw(pDC);
	}

	return TRUE;
}

void CXTPExcelTabCtrl::OnDraw(CDC* pDC)
{
	CRect rectPaint(m_rectTabs);  // this the only part we care about

	pDC->FillSolidRect(rectPaint, GetXtremeColor(COLOR_3DFACE));

	// Exclude the arrow buttons from being repainted.
	const int iTotalArrowWidth = GetTotalArrowWidth();
	CRect rcArrows(rectPaint);
	rcArrows.top += 1;
	rcArrows.right = rcArrows.left + iTotalArrowWidth-1;

	pDC->FillSolidRect(0, (m_dwStyle & FTS_XTP_BOTTOM) ? rectPaint.top : rectPaint.bottom - 1,
		rectPaint.Width(), 1, m_pTheme->m_clr3DShadow);

	int i;
	for (i = 0; i < BUTTON_COUNT; ++i)
	{
		if (CRect().IntersectRect(rectPaint, m_buttons[i].m_rect))
		{
			m_pTheme->DrawButton(pDC, this, m_buttons[i]);
		}
	}

	if (rectPaint.right >= rcArrows.right)
	{
		const int nTotalTabWidth = GetTotalTabWidth();

		// Draw the tabs to an offscreen device context, this is done
		// so that we can "scroll" the entire tab group left or right whenever
		// any of the arrow buttons are pressed.
		CDC tabDC;
		tabDC.CreateCompatibleDC(pDC);
		CBitmap bitmap;
		bitmap.CreateCompatibleBitmap(pDC, nTotalTabWidth, m_cy);
		CBitmap* pOldBitmap = tabDC.SelectObject(&bitmap);

		// Fill the background color.
		CRect rcTabs(0, 0, nTotalTabWidth, m_cy);
		tabDC.FillSolidRect(rcTabs, GetXtremeColor(COLOR_3DFACE));

		// Define xy coordinates to draw each tab.
		const int iOverlap = GetOverlap();
		int x = 0;
		int iSelX = 0;
		int y = 0;

		// Draw all of the non-selected tabs first...
		const int cItems = GetItemCount();
		for (i = 0; i < cItems; i++)
		{
			if (i != m_nCurSel)
			{
				const int cx = m_pTheme->DrawTab(&tabDC, this,
					CPoint(x, y), false, m_tcbItems[i]);
				x += cx;
			}
			else
			{
				iSelX = x;
				x += GetTabWidth(i);
			}
			x -= iOverlap;
		}

		// then draw the selected tab. Make sure that m_TabList is not empty.
		if (m_nCurSel >= 0 && cItems > 0)
		{
			m_pTheme->DrawTab(&tabDC, this,
				CPoint(iSelX, y), true, m_tcbItems[m_nCurSel]);
		}

		// blit the bitmap onto the pDC->
		pDC->BitBlt(iTotalArrowWidth, rectPaint.top, GetTotalTabAreaWidth(),
			m_cy, &tabDC, m_nOffset, 0, SRCCOPY);
		// cleanup.
		tabDC.SelectObject(pOldBitmap);
	}

	if (m_dwStyle & FTS_XTP_HSCROLL)
	{
		DrawGripper(pDC, m_rectGripper);
	}
}

void CXTPExcelTabCtrl::DrawGripper(CDC* pDC, CRect rect) const
{
	pDC->Draw3dRect(rect, GetXtremeColor(COLOR_3DHILIGHT), GetXtremeColor(COLOR_3DSHADOW));
	rect.InflateRect(-CX_BORDER, -CY_BORDER);

	// fill the middle
	pDC->FillSolidRect(rect, GetXtremeColor(COLOR_3DFACE));
}

BOOL CXTPExcelTabCtrl::PreTranslateMessage(MSG* pMsg)
{
	ASSERT_VALID(this);
	if (pMsg->message == WM_KEYDOWN)
	{
		if (pMsg->wParam == VK_ESCAPE)
		{
			if (m_bTracking)
			{
				SetTracking(false);
			}

			return TRUE; // eat ESC keyboard press...
		}
	}

	if (::IsWindow(m_ToolTip.m_hWnd))
	{
		if (pMsg->message == WM_MOUSEMOVE && pMsg->hwnd == m_hWnd)
		{
			CPoint Point(LOWORD(pMsg->lParam), HIWORD(pMsg->lParam));

			TCHITTESTINFO htInfo;
			htInfo.pt = Point;
			int iTab = HitTest(&htInfo);

			if (iTab >= 0)
			{
				CString strOldTipText;
				CString strNewTipText = m_tcbItems[iTab]->szToolTipLabel;

				m_ToolTip.GetText(strOldTipText, this);

				// If the tip text differs, update the tooltip control.
				if (strNewTipText != strOldTipText)
				{
					m_ToolTip.DelTool(this);
					m_ToolTip.AddTool(this, strNewTipText);
				}

				// Pass on to tooltip.
				m_ToolTip.RelayEvent(pMsg);
			}
			else
			{
				m_ToolTip.SendMessage(TTM_POP, 0, 0L);
			}
		}
		else
		{
			m_ToolTip.SendMessage(TTM_POP, 0, 0L);
		}
	}

	return CWnd::PreTranslateMessage(pMsg);
}

void CXTPExcelTabCtrl::SetTipText(int nItem, LPCTSTR lpszTabTip)
{
	const int cItems = GetItemCount();
	if (nItem < 0 || nItem >= cItems)
	{
		ASSERT(0);
		return;
	}
	m_tcbItems[nItem]->szToolTipLabel = lpszTabTip;
}

CString CXTPExcelTabCtrl::GetTipText(int nItem)
{
	const int cItems = GetItemCount();
	if (nItem < 0 || nItem >= cItems)
	{
		ASSERT(0);
		return _T("");
	}
	return m_tcbItems[nItem]->szToolTipLabel;
}

void CXTPExcelTabCtrl::Home()
{
	OnHomeArrow();
}

void CXTPExcelTabCtrl::OnMouseMove(UINT nFlags, CPoint point)
{
	if (m_bTracking)
	{
		// resize
		SetGripperPosition(point.x + m_xTrackingDelta, false);
	}
	else
	{
		if (ButtonHitTest(point) != m_iBtnHilight)
		{
			SetTimer(1, 10, NULL);
			OnTimer(1);
		}
	}

	CWnd::OnMouseMove(nFlags, point);
}

BOOL CXTPExcelTabCtrl::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
	if (m_bTracking && GetCapture() != this)
	{
		m_bTracking = FALSE;
	}

	POINT pt;
	GetCursorPos(&pt);
	ScreenToClient(&pt);
	if (m_bTracking || m_rectGripper.PtInRect(pt))
	{
		::SetCursor(XTPAuxData().hcurHSplitBar);
		return TRUE;
	}

	return CWnd::OnSetCursor(pWnd, nHitTest, message);
}

void CXTPExcelTabCtrl::SetTracking(bool bTracking)
{
	if (m_bTracking == bTracking)
	{
		return;
	}

	m_bTracking = bTracking;
	if (bTracking)
	{
		SetCapture();
		POINT pt;
		GetCursorPos(&pt);
		ScreenToClient(&pt);
		m_xTrackingDelta = GetGripperPosition() - pt.x;
		m_pWndLastFocus = SetFocus();
	}
	else
	{
		ReleaseCapture();
		if (::IsWindow(m_pWndLastFocus->GetSafeHwnd()))
		{
			m_pWndLastFocus->SetFocus();
		}
		else
		{
			m_pWndLastFocus = NULL;
		}
	}
}

void CXTPExcelTabCtrl::OnLButtonDblClk(UINT nFlags, CPoint point)
{
	// on a button ?
	int iButton = ButtonHitTest(point);
	if (iButton >= 0)
	{
		CXTPExcelTabCtrlButtonState& b = m_buttons[iButton];
		if (b.m_bEnabled)
		{
			SetCapture();
			b.m_bPressed = true;
			RedrawWindow(b.m_rect);
		}
		return;
	}

	CWnd::OnLButtonDblClk(nFlags, point);
}

void CXTPExcelTabCtrl::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* /*pScrollBar*/)
{
	CWnd *pWndControl = GetItemWindow(m_nCurSel);
	if (!pWndControl)
		return;

	if (pWndControl->GetSafeHwnd())
	{
		if (nSBCode == SB_THUMBPOSITION || nSBCode == SB_THUMBTRACK)
		{
			int dx = nPos - pWndControl->GetScrollPos(SB_HORZ);
			if (dx)
			{
				pWndControl->SendMessage(LVM_SCROLL, dx, 0);
			}
		}

		// pass message to control's scroll bar
		_AFX_THREAD_STATE* pThreadState = AfxGetThreadState();
		pWndControl->SendMessage(
			pThreadState->m_lastSentMsg.message,
			pThreadState->m_lastSentMsg.wParam,
			(LPARAM)pWndControl->GetScrollBarCtrl(SB_HORZ)->GetSafeHwnd());

		// reflect changes in our scroll bar
		SyncScrollBar();
	}
}

void CXTPExcelTabCtrl::SyncScrollBar()
{
	if (!m_wndHScrollBar.m_hWnd)
	{
		return;
	}

	CWnd *pWndControl = NULL;
	if (m_nCurSel >= 0)
	{
		pWndControl = m_tcbItems[m_nCurSel]->pWnd;
	}
	if (pWndControl && pWndControl->GetSafeHwnd())
	{
		pWndControl->ShowScrollBar(SB_HORZ, FALSE);
		pWndControl->ModifyStyle(WS_HSCROLL, 0, SWP_DRAWFRAME);

		SCROLLINFO si;
		ZeroMemory(&si, sizeof(si));
		si.cbSize = sizeof(si);
		si.fMask = SIF_ALL;

		if (!pWndControl->GetScrollInfo (SB_HORZ, &si) ||
			si.nPage == 0 ||
			si.nMin + (int) si.nPage >= si.nMax)
		{
			m_wndHScrollBar.EnableWindow(FALSE);
		}
		else
		{
			m_wndHScrollBar.EnableWindow(TRUE);
			m_wndHScrollBar.SetScrollInfo(&si);
		}
	}
	else
	{
		m_wndHScrollBar.EnableWindow(FALSE);
	}
}

BOOL CXTPExcelTabCtrl::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
	NMHDR* pNMHDR = (NMHDR*)lParam;
	ASSERT (pNMHDR != NULL);

	BOOL bRetVal = CWnd::OnNotify(wParam, lParam, pResult);

	if (pNMHDR && pNMHDR->code == HDN_ITEMCHANGED)
	{
		SyncScrollBar();
	}

	return bRetVal;
}

void CXTPExcelTabCtrl::RecalcLayout()
{
	m_rectViews.left = m_rectTabs.left = 0;
	m_rectViews.right = m_rectTabs.right = m_nClientWidth;
	if (m_dwStyle & FTS_XTP_BOTTOM)
	{
		m_rectTabs.top = m_nClientHeight - m_cy;
		m_rectViews.top = 0;
	}
	else
	{
		m_rectTabs.top = 0;
		m_rectViews.top = m_cy;
	}
	m_rectTabs.bottom = m_rectTabs.top + m_cy;
	m_rectViews.bottom = m_rectViews.top + m_nClientHeight - m_cy;

	int nIndex;

	// update managed view positions
	if (m_bManagingViews)
	{
		const int cItems = GetItemCount();
		for (nIndex = 0; nIndex < cItems; ++nIndex)
		{
			ASSERT(m_tcbItems[nIndex]->pWnd->GetSafeHwnd());
			m_tcbItems[nIndex]->pWnd->SetWindowPos(NULL,
				m_rectViews.left, m_rectViews.top,
				m_rectViews.Width(), m_rectViews.Height(),
				SWP_NOZORDER | SWP_NOREDRAW);
		}
	}

	// update arrow buttons if we have them
	if (m_dwStyle & FTS_XTP_HASARROWS)
	{
		CRect btnRects[] =
		{
			CRect(0, m_rectTabs.top + 1, m_cx, m_rectTabs.bottom),
			CRect(m_cx, m_rectTabs.top + 1, m_cx * 2, m_rectTabs.bottom),
			CRect(m_cx * 2, m_rectTabs.top + 1, m_cx * 3, m_rectTabs.bottom),
			CRect(m_cx * 3, m_rectTabs.top + 1, m_cx * 4, m_rectTabs.bottom)
		};

		const int cButtons = (m_dwStyle & FTS_XTP_HASHOMEEND) ? 4 : 2;
		for (nIndex = 0; nIndex < cButtons; ++nIndex)
		{
			m_buttons[nIndex].m_rect = btnRects[nIndex];
		}
	}

	EnableButtons();
}

LPCTSTR CXTPExcelTabCtrl::GetItemText(int nIndex) const
{
	if (nIndex < 0 || nIndex >= GetItemCount())
	{
		return NULL;
	}

	return m_tcbItems[nIndex]->szTabLabel;
}

bool CXTPExcelTabCtrl::SetItemText(int nIndex, LPCTSTR pszText)
{
	if (nIndex < 0 || nIndex >= GetItemCount())
	{
		return false;
	}

	m_tcbItems[nIndex]->szTabLabel = pszText;
	RecalcLayout();
	InvalidateTabs();
	return true;
}

CWnd *CXTPExcelTabCtrl::GetItemWindow(int nIndex) const
{
	if (nIndex < 0 || nIndex >= GetItemCount())
	{
		return NULL;
	}

	return m_tcbItems[nIndex]->pWnd;
}

int CXTPExcelTabCtrl::GetOverlap() const
{
	return ((m_cy / 2) + 2);
}

void CXTPExcelTabCtrl::UpdateDefaultColors()
{
	RefreshMetrics();
}

void CXTPExcelTabCtrl::SetTabShadowColor(COLORREF crShadow)
{
	m_pTheme->m_clr3DShadow.SetCustomValue(crShadow);
}

COLORREF CXTPExcelTabCtrl::GetTabShadowColor() const
{
	return m_pTheme->m_clr3DShadow;
}

void CXTPExcelTabCtrl::SetTabHilightColor(COLORREF crHilight)
{
	m_pTheme->m_clr3DHilight.SetCustomValue(crHilight);
}

COLORREF CXTPExcelTabCtrl::GetTabHilightColor() const
{
	return m_pTheme->m_clr3DHilight;
}

void CXTPExcelTabCtrl::SetTabBackColor(COLORREF crBack)
{
	m_pTheme->m_clr3DFace.SetCustomValue(crBack);
}

COLORREF CXTPExcelTabCtrl::GetTabBackColor() const
{
	return m_pTheme->m_clr3DFace;
}

void CXTPExcelTabCtrl::SetTabTextColor(COLORREF crText)
{
	m_pTheme->m_clrBtnText.SetCustomValue(crText);
}

COLORREF CXTPExcelTabCtrl::GetTabTextColor() const
{
	return m_pTheme->m_clrBtnText;
}

void CXTPExcelTabCtrl::SetSelTabBackColor(COLORREF crBack)
{
	m_pTheme->m_clrWindow.SetCustomValue(crBack);
}

COLORREF CXTPExcelTabCtrl::GetSelTabBackColor() const
{
	return m_pTheme->m_clrWindow;
}

void CXTPExcelTabCtrl::SetSelTabTextColor(COLORREF crText)
{
	m_pTheme->m_clrWindowText.SetCustomValue(crText);
}

COLORREF CXTPExcelTabCtrl::GetSelTabTextColor() const
{
	return m_pTheme->m_clrWindowText;
}

CScrollBar* CXTPExcelTabCtrl::GetScrollBarCtrl(int nBar) const
{
	if (nBar == SB_HORZ && ::IsWindow(m_wndHScrollBar.m_hWnd))
	{
		return (CScrollBar*)&m_wndHScrollBar;
	}
	return CWnd::GetScrollBarCtrl(nBar);
}

CRect CXTPExcelTabCtrl::GetTotalButtonRect() const
{
	CRect rect;

	rect.CopyRect(&m_buttons[0].m_rect);

	int iWidth = 0;
	for (int i = 0; i < BUTTON_COUNT; ++i)
	{
		iWidth += m_buttons[i].m_rect.Width();
	}

	rect.right = rect.left + iWidth;

	return rect;
}

void CXTPExcelTabCtrl::OnTimer(UINT_PTR nIDEvent)
{
	if (nIDEvent == 1)
	{
		CRect rc;
		GetWindowRect(rc);

		CPoint point;
		GetCursorPos(&point);
		ScreenToClient(&point);

		int iBtnHilight = ButtonHitTest(point);
		if (iBtnHilight == -1)
		{
			KillTimer(1);

			if (m_bPainted == TRUE)
			{
				CRect rect = GetTotalButtonRect();
				InvalidateRect(&rect);
			}

			m_iBtnHilight = iBtnHilight;
			m_bPainted = FALSE;
		}

		// On mouse over, show raised button.
		else if (!m_bPainted || (iBtnHilight != m_iBtnHilight))
		{
			CRect rect = GetTotalButtonRect();
			InvalidateRect(&rect);

			m_iBtnHilight = iBtnHilight;
			m_bPainted = TRUE;
		}
	}
	else
	{
		CWnd::OnTimer(nIDEvent);
	}
}

void CXTPExcelTabCtrl::SetTabBackColor(int nIndex, COLORREF crBack)
{
	if (nIndex >= 0 && nIndex < GetItemCount())
	{
		m_tcbItems[nIndex]->crTabBack = crBack;

		CRect rcItem;
		GetItemRect(nIndex, &rcItem);
		InvalidateRect(rcItem);
	}
}

void CXTPExcelTabCtrl::SetTabTextColor(int nIndex, COLORREF crText)
{
	if (nIndex >= 0 && nIndex < GetItemCount())
	{
		m_tcbItems[nIndex]->crTabText = crText;

		CRect rcItem;
		GetItemRect(nIndex, &rcItem);
		InvalidateRect(rcItem);
	}
}

void CXTPExcelTabCtrl::SetSelTabBackColor(int nIndex, COLORREF crSelBack)
{
	if (nIndex >= 0 && nIndex < GetItemCount())
	{
		m_tcbItems[nIndex]->crTabSelBack = crSelBack;

		CRect rcItem;
		GetItemRect(nIndex, &rcItem);
		InvalidateRect(rcItem);
	}
}

void CXTPExcelTabCtrl::SetSelTabTextColor(int nIndex, COLORREF crSelText)
{
	if (nIndex >= 0 && nIndex < GetItemCount())
	{
		m_tcbItems[nIndex]->crTabSelText = crSelText;

		CRect rcItem;
		GetItemRect(nIndex, &rcItem);
		InvalidateRect(rcItem);
	}
}

COLORREF CXTPExcelTabCtrl::GetTabBackColor(int nIndex) const
{
	return m_pTheme->GetTabBackColor(m_tcbItems[nIndex]);
}

COLORREF CXTPExcelTabCtrl::GetTabTextColor(int nIndex) const
{
	return m_pTheme->GetTabTextColor(m_tcbItems[nIndex]);
}

COLORREF CXTPExcelTabCtrl::GetSelTabBackColor(int nIndex) const
{
	return m_pTheme->GetSelTabBackColor(m_tcbItems[nIndex]);
}

COLORREF CXTPExcelTabCtrl::GetSelTabTextColor(int nIndex) const
{
	return m_pTheme->GetSelTabTextColor(m_tcbItems[nIndex]);
}