// Windows Template Library - WTL version 10.0
// Copyright (C) Microsoft Corporation, WTL Team. All rights reserved.
//
// This file is a part of the Windows Template Library.
// The use and distribution terms for this software are covered by the
// Microsoft Public License (http://opensource.org/licenses/MS-PL)
// which can be found in the file MS-PL.txt at the root folder.

#ifndef __ATLSPLIT_H__
#define __ATLSPLIT_H__

#pragma once

#ifndef __ATLAPP_H__
	#error atlsplit.h requires atlapp.h to be included first
#endif

#ifndef __ATLWIN_H__
	#error atlsplit.h requires atlwin.h to be included first
#endif


///////////////////////////////////////////////////////////////////////////////
// Classes in this file:
//
// CSplitterImpl<T>
// CSplitterWindowImpl<T, TBase, TWinTraits>
// CSplitterWindowT<t_bVertical> - CSplitterWindow, CHorSplitterWindow


namespace WTL
{

///////////////////////////////////////////////////////////////////////////////
// CSplitterImpl - Provides splitter support to any window

// Splitter panes constants
#define SPLIT_PANE_LEFT			 0
#define SPLIT_PANE_RIGHT		 1
#define SPLIT_PANE_TOP			 SPLIT_PANE_LEFT
#define SPLIT_PANE_BOTTOM		 SPLIT_PANE_RIGHT
#define SPLIT_PANE_NONE			-1

// Splitter extended styles
#define SPLIT_PROPORTIONAL		0x00000001
#define SPLIT_NONINTERACTIVE		0x00000002
#define SPLIT_RIGHTALIGNED		0x00000004
#define SPLIT_BOTTOMALIGNED		SPLIT_RIGHTALIGNED
#define SPLIT_GRADIENTBAR		0x00000008
#define SPLIT_FLATBAR			0x00000020
#define SPLIT_FIXEDBARSIZE		0x00000010

// Note: SPLIT_PROPORTIONAL and SPLIT_RIGHTALIGNED/SPLIT_BOTTOMALIGNED are 
// mutually exclusive. If both are set, splitter defaults to SPLIT_PROPORTIONAL.
// Also, SPLIT_FLATBAR overrides SPLIT_GRADIENTBAR if both are set.


template <class T>
class CSplitterImpl
{
public:
	enum { m_nPanesCount = 2, m_nPropMax = INT_MAX, m_cxyStep = 10 };

	bool m_bVertical;
	HWND m_hWndPane[m_nPanesCount];
	RECT m_rcSplitter;
	int m_xySplitterPos;            // splitter bar position
	int m_xySplitterPosNew;         // internal - new position while moving
	HWND m_hWndFocusSave;
	int m_nDefActivePane;
	int m_cxySplitBar;              // splitter bar width/height
	HCURSOR m_hCursor;
	int m_cxyMin;                   // minimum pane size
	int m_cxyBarEdge;              	// splitter bar edge
	bool m_bFullDrag;
	int m_cxyDragOffset;		// internal
	int m_nProportionalPos;
	bool m_bUpdateProportionalPos;
	DWORD m_dwExtendedStyle;        // splitter specific extended styles
	int m_nSinglePane;              // single pane mode
	int m_xySplitterDefPos;         // default position
	bool m_bProportionalDefPos;     // porportinal def pos

// Constructor
	CSplitterImpl(bool bVertical = true) : 
	              m_bVertical(bVertical), m_xySplitterPos(-1), m_xySplitterPosNew(-1), m_hWndFocusSave(NULL), 
	              m_nDefActivePane(SPLIT_PANE_NONE), m_cxySplitBar(4), m_hCursor(NULL), m_cxyMin(0), m_cxyBarEdge(0), 
	              m_bFullDrag(true), m_cxyDragOffset(0), m_nProportionalPos(0), m_bUpdateProportionalPos(true),
	              m_dwExtendedStyle(SPLIT_PROPORTIONAL), m_nSinglePane(SPLIT_PANE_NONE), 
	              m_xySplitterDefPos(-1), m_bProportionalDefPos(false)
	{
		m_hWndPane[SPLIT_PANE_LEFT] = NULL;
		m_hWndPane[SPLIT_PANE_RIGHT] = NULL;

		::SetRectEmpty(&m_rcSplitter);
	}

// Attributes
	void SetSplitterRect(LPRECT lpRect = NULL, bool bUpdate = true)
	{
		if(lpRect == NULL)
		{
			T* pT = static_cast<T*>(this);
			pT->GetClientRect(&m_rcSplitter);
		}
		else
		{
			m_rcSplitter = *lpRect;
		}

		if(IsProportional())
			UpdateProportionalPos();
		else if(IsRightAligned())
			UpdateRightAlignPos();

		if(bUpdate)
			UpdateSplitterLayout();
	}

	void GetSplitterRect(LPRECT lpRect) const
	{
		ATLASSERT(lpRect != NULL);
		*lpRect = m_rcSplitter;
	}

	bool SetSplitterPos(int xyPos = -1, bool bUpdate = true)
	{
		if(xyPos == -1)   // -1 == default position
		{
			if(m_bProportionalDefPos)
			{
				ATLASSERT((m_xySplitterDefPos >= 0) && (m_xySplitterDefPos <= m_nPropMax));

				if(m_bVertical)
					xyPos = ::MulDiv(m_xySplitterDefPos, m_rcSplitter.right - m_rcSplitter.left - m_cxySplitBar - m_cxyBarEdge, m_nPropMax);
				else
					xyPos = ::MulDiv(m_xySplitterDefPos, m_rcSplitter.bottom - m_rcSplitter.top - m_cxySplitBar - m_cxyBarEdge, m_nPropMax);
			}
			else if(m_xySplitterDefPos != -1)
			{
				xyPos = m_xySplitterDefPos;
			}
			else   // not set, use middle position
			{
				if(m_bVertical)
					xyPos = (m_rcSplitter.right - m_rcSplitter.left - m_cxySplitBar - m_cxyBarEdge) / 2;
				else
					xyPos = (m_rcSplitter.bottom - m_rcSplitter.top - m_cxySplitBar - m_cxyBarEdge) / 2;
			}
		}

		// Adjust if out of valid range
		int cxyMax = 0;
		if(m_bVertical)
			cxyMax = m_rcSplitter.right - m_rcSplitter.left;
		else
			cxyMax = m_rcSplitter.bottom - m_rcSplitter.top;

		if(xyPos < m_cxyMin + m_cxyBarEdge)
			xyPos = m_cxyMin;
		else if(xyPos > (cxyMax - m_cxySplitBar - m_cxyBarEdge - m_cxyMin))
			xyPos = cxyMax - m_cxySplitBar - m_cxyBarEdge - m_cxyMin;

		// Set new position and update if requested
		bool bRet = (m_xySplitterPos != xyPos);
		m_xySplitterPos = xyPos;

		if(m_bUpdateProportionalPos)
		{
			if(IsProportional())
				StoreProportionalPos();
			else if(IsRightAligned())
				StoreRightAlignPos();
		}
		else
		{
			m_bUpdateProportionalPos = true;
		}

		if(bUpdate && bRet)
			UpdateSplitterLayout();

		return bRet;
	}

	int GetSplitterPos() const
	{
		return m_xySplitterPos;
	}

	void SetSplitterPosPct(int nPct, bool bUpdate = true)
	{
		ATLASSERT((nPct >= 0) && (nPct <= 100));

		m_nProportionalPos = ::MulDiv(nPct, m_nPropMax, 100);
		UpdateProportionalPos();

		if(bUpdate)
			UpdateSplitterLayout();
	}

	int GetSplitterPosPct() const
	{
		int cxyTotal = m_bVertical ? (m_rcSplitter.right - m_rcSplitter.left - m_cxySplitBar - m_cxyBarEdge) : (m_rcSplitter.bottom - m_rcSplitter.top - m_cxySplitBar - m_cxyBarEdge);
		return ((cxyTotal > 0) && (m_xySplitterPos >= 0)) ? ::MulDiv(m_xySplitterPos, 100, cxyTotal) : -1;
	}

	bool SetSinglePaneMode(int nPane = SPLIT_PANE_NONE)
	{
		ATLASSERT((nPane == SPLIT_PANE_LEFT) || (nPane == SPLIT_PANE_RIGHT) || (nPane == SPLIT_PANE_NONE));
		if(!((nPane == SPLIT_PANE_LEFT) || (nPane == SPLIT_PANE_RIGHT) || (nPane == SPLIT_PANE_NONE)))
			return false;

		if(nPane != SPLIT_PANE_NONE)
		{
			if(::IsWindowVisible(m_hWndPane[nPane]) == FALSE)
				::ShowWindow(m_hWndPane[nPane], SW_SHOW);
			int nOtherPane = (nPane == SPLIT_PANE_LEFT) ? SPLIT_PANE_RIGHT : SPLIT_PANE_LEFT;
			::ShowWindow(m_hWndPane[nOtherPane], SW_HIDE);
			if(m_nDefActivePane != nPane)
				m_nDefActivePane = nPane;
		}
		else if(m_nSinglePane != SPLIT_PANE_NONE)
		{
			int nOtherPane = (m_nSinglePane == SPLIT_PANE_LEFT) ? SPLIT_PANE_RIGHT : SPLIT_PANE_LEFT;
			::ShowWindow(m_hWndPane[nOtherPane], SW_SHOW);
		}

		m_nSinglePane = nPane;
		UpdateSplitterLayout();

		return true;
	}

	int GetSinglePaneMode() const
	{
		return m_nSinglePane;
	}

	DWORD GetSplitterExtendedStyle() const
	{
		return m_dwExtendedStyle;
	}

	DWORD SetSplitterExtendedStyle(DWORD dwExtendedStyle, DWORD dwMask = 0)
	{
		DWORD dwPrevStyle = m_dwExtendedStyle;
		if(dwMask == 0)
			m_dwExtendedStyle = dwExtendedStyle;
		else
			m_dwExtendedStyle = (m_dwExtendedStyle & ~dwMask) | (dwExtendedStyle & dwMask);

#ifdef _DEBUG
		if(IsProportional() && IsRightAligned())
			ATLTRACE2(atlTraceUI, 0, _T("CSplitterImpl::SetSplitterExtendedStyle - SPLIT_PROPORTIONAL and SPLIT_RIGHTALIGNED are mutually exclusive, defaulting to SPLIT_PROPORTIONAL.\n"));
#endif // _DEBUG

		return dwPrevStyle;
	}

	void SetSplitterDefaultPos(int xyPos = -1)
	{
		m_xySplitterDefPos = xyPos;
		m_bProportionalDefPos = false;
	}

	void SetSplitterDefaultPosPct(int nPct)
	{
		ATLASSERT((nPct >= 0) && (nPct <= 100));

		m_xySplitterDefPos = ::MulDiv(nPct, m_nPropMax, 100);
		m_bProportionalDefPos = true;
	}

// Splitter operations
	void SetSplitterPanes(HWND hWndLeftTop, HWND hWndRightBottom, bool bUpdate = true)
	{
		m_hWndPane[SPLIT_PANE_LEFT] = hWndLeftTop;
		m_hWndPane[SPLIT_PANE_RIGHT] = hWndRightBottom;
		ATLASSERT((m_hWndPane[SPLIT_PANE_LEFT] == NULL) || (m_hWndPane[SPLIT_PANE_RIGHT] == NULL) || (m_hWndPane[SPLIT_PANE_LEFT] != m_hWndPane[SPLIT_PANE_RIGHT]));
		if(bUpdate)
			UpdateSplitterLayout();
	}

	bool SetSplitterPane(int nPane, HWND hWnd, bool bUpdate = true)
	{
		ATLASSERT((nPane == SPLIT_PANE_LEFT) || (nPane == SPLIT_PANE_RIGHT));
		if((nPane != SPLIT_PANE_LEFT) && (nPane != SPLIT_PANE_RIGHT))
			return false;

		m_hWndPane[nPane] = hWnd;
		ATLASSERT((m_hWndPane[SPLIT_PANE_LEFT] == NULL) || (m_hWndPane[SPLIT_PANE_RIGHT] == NULL) || (m_hWndPane[SPLIT_PANE_LEFT] != m_hWndPane[SPLIT_PANE_RIGHT]));
		if(bUpdate)
			UpdateSplitterLayout();

		return true;
	}

	HWND GetSplitterPane(int nPane) const
	{
		ATLASSERT((nPane == SPLIT_PANE_LEFT) || (nPane == SPLIT_PANE_RIGHT));
		if((nPane != SPLIT_PANE_LEFT) && (nPane != SPLIT_PANE_RIGHT))
			return NULL;

		return m_hWndPane[nPane];
	}

	bool SetActivePane(int nPane)
	{
		ATLASSERT((nPane == SPLIT_PANE_LEFT) || (nPane == SPLIT_PANE_RIGHT));
		if((nPane != SPLIT_PANE_LEFT) && (nPane != SPLIT_PANE_RIGHT))
			return false;
		if((m_nSinglePane != SPLIT_PANE_NONE) && (nPane != m_nSinglePane))
			return false;

		::SetFocus(m_hWndPane[nPane]);
		m_nDefActivePane = nPane;

		return true;
	}

	int GetActivePane() const
	{
		int nRet = SPLIT_PANE_NONE;
		HWND hWndFocus = ::GetFocus();
		if(hWndFocus != NULL)
		{
			for(int nPane = 0; nPane < m_nPanesCount; nPane++)
			{
				if((hWndFocus == m_hWndPane[nPane]) || (::IsChild(m_hWndPane[nPane], hWndFocus) != FALSE))
				{
					nRet = nPane;
					break;
				}
			}
		}

		return nRet;
	}

	bool ActivateNextPane(bool bNext = true)
	{
		int nPane = m_nSinglePane;
		if(nPane == SPLIT_PANE_NONE)
		{
			switch(GetActivePane())
			{
			case SPLIT_PANE_LEFT:
				nPane = SPLIT_PANE_RIGHT;
				break;
			case SPLIT_PANE_RIGHT:
				nPane = SPLIT_PANE_LEFT;
				break;
			default:
				nPane = bNext ? SPLIT_PANE_LEFT : SPLIT_PANE_RIGHT;
				break;
			}
		}

		return SetActivePane(nPane);
	}

	bool SetDefaultActivePane(int nPane)
	{
		ATLASSERT((nPane == SPLIT_PANE_LEFT) || (nPane == SPLIT_PANE_RIGHT));
		if((nPane != SPLIT_PANE_LEFT) && (nPane != SPLIT_PANE_RIGHT))
			return false;

		m_nDefActivePane = nPane;

		return true;
	}

	bool SetDefaultActivePane(HWND hWnd)
	{
		for(int nPane = 0; nPane < m_nPanesCount; nPane++)
		{
			if(hWnd == m_hWndPane[nPane])
			{
				m_nDefActivePane = nPane;
				return true;
			}
		}

		return false;   // not found
	}

	int GetDefaultActivePane() const
	{
		return m_nDefActivePane;
	}

	void DrawSplitter(CDCHandle dc)
	{
		ATLASSERT(dc.m_hDC != NULL);
		if((m_nSinglePane == SPLIT_PANE_NONE) && (m_xySplitterPos == -1))
			return;

		T* pT = static_cast<T*>(this);
		if(m_nSinglePane == SPLIT_PANE_NONE)
		{
			pT->DrawSplitterBar(dc);

			for(int nPane = 0; nPane < m_nPanesCount; nPane++)
			{
				if(m_hWndPane[nPane] == NULL)
					pT->DrawSplitterPane(dc, nPane);
			}
		}
		else
		{
			if(m_hWndPane[m_nSinglePane] == NULL)
				pT->DrawSplitterPane(dc, m_nSinglePane);
		}
	}

	// call to initiate moving splitter bar with keyboard
	void MoveSplitterBar()
	{
		T* pT = static_cast<T*>(this);

		int x = 0;
		int y = 0;
		if(m_bVertical)
		{
			x = m_xySplitterPos + (m_cxySplitBar / 2) + m_cxyBarEdge;
			y = (m_rcSplitter.bottom - m_rcSplitter.top - m_cxySplitBar - m_cxyBarEdge) / 2;
		}
		else
		{
			x = (m_rcSplitter.right - m_rcSplitter.left - m_cxySplitBar - m_cxyBarEdge) / 2;
			y = m_xySplitterPos + (m_cxySplitBar / 2) + m_cxyBarEdge;
		}

		POINT pt = { x, y };
		pT->ClientToScreen(&pt);
		::SetCursorPos(pt.x, pt.y);

		m_xySplitterPosNew = m_xySplitterPos;
		pT->SetCapture();
		m_hWndFocusSave = pT->SetFocus();
		::SetCursor(m_hCursor);
		if(!m_bFullDrag)
			DrawGhostBar();
		if(m_bVertical)
			m_cxyDragOffset = x - m_rcSplitter.left - m_xySplitterPos;
		else
			m_cxyDragOffset = y - m_rcSplitter.top - m_xySplitterPos;
	}

	void SetOrientation(bool bVertical, bool bUpdate = true)
	{
		if(m_bVertical != bVertical)
		{
			m_bVertical = bVertical;

			m_hCursor = ::LoadCursor(NULL, m_bVertical ? IDC_SIZEWE : IDC_SIZENS);

			T* pT = static_cast<T*>(this);
			pT->GetSystemSettings(false);

			if(m_bVertical)
				m_xySplitterPos = ::MulDiv(m_xySplitterPos, m_rcSplitter.right - m_rcSplitter.left, m_rcSplitter.bottom - m_rcSplitter.top);
			else
				m_xySplitterPos = ::MulDiv(m_xySplitterPos, m_rcSplitter.bottom - m_rcSplitter.top, m_rcSplitter.right - m_rcSplitter.left);
		}

		if(bUpdate)
			UpdateSplitterLayout();
	}

// Overrideables
	void DrawSplitterBar(CDCHandle dc)
	{
		RECT rect = {};
		if(GetSplitterBarRect(&rect))
		{
			dc.FillRect(&rect, COLOR_3DFACE);

			if((m_dwExtendedStyle & SPLIT_FLATBAR) != 0)
			{
				RECT rect1 = rect;
				if(m_bVertical)
					rect1.right = rect1.left + 1;
				else
					rect1.bottom = rect1.top + 1;
				dc.FillRect(&rect1, COLOR_WINDOW);

				rect1 = rect;
				if(m_bVertical)
					rect1.left = rect1.right - 1;
				else
					rect1.top = rect1.bottom - 1;
				dc.FillRect(&rect1, COLOR_3DSHADOW);
			}
			else if((m_dwExtendedStyle & SPLIT_GRADIENTBAR) != 0)
			{
				RECT rect2 = rect;
				if(m_bVertical)
					rect2.left = (rect.left + rect.right) / 2 - 1;
				else
					rect2.top = (rect.top + rect.bottom) / 2 - 1;

				dc.GradientFillRect(rect2, ::GetSysColor(COLOR_3DFACE), ::GetSysColor(COLOR_3DSHADOW), m_bVertical);
			}

			// draw 3D edge if needed
			T* pT = static_cast<T*>(this);
			if((pT->GetExStyle() & WS_EX_CLIENTEDGE) != 0)
				dc.DrawEdge(&rect, EDGE_RAISED, m_bVertical ? (BF_LEFT | BF_RIGHT) : (BF_TOP | BF_BOTTOM));
		}
	}

	// called only if pane is empty
	void DrawSplitterPane(CDCHandle dc, int nPane)
	{
		RECT rect = {};
		if(GetSplitterPaneRect(nPane, &rect))
		{
			T* pT = static_cast<T*>(this);
			if((pT->GetExStyle() & WS_EX_CLIENTEDGE) == 0)
				dc.DrawEdge(&rect, EDGE_SUNKEN, BF_RECT | BF_ADJUST);
			dc.FillRect(&rect, COLOR_APPWORKSPACE);
		}
	}

// Message map and handlers
	BEGIN_MSG_MAP(CSplitterImpl)
		MESSAGE_HANDLER(WM_CREATE, OnCreate)
		MESSAGE_HANDLER(WM_PAINT, OnPaint)
		MESSAGE_HANDLER(WM_PRINTCLIENT, OnPaint)
		if(IsInteractive())
		{
			MESSAGE_HANDLER(WM_SETCURSOR, OnSetCursor)
			MESSAGE_HANDLER(WM_MOUSEMOVE, OnMouseMove)
			MESSAGE_HANDLER(WM_LBUTTONDOWN, OnLButtonDown)
			MESSAGE_HANDLER(WM_LBUTTONUP, OnLButtonUp)
			MESSAGE_HANDLER(WM_LBUTTONDBLCLK, OnLButtonDoubleClick)
			MESSAGE_HANDLER(WM_CAPTURECHANGED, OnCaptureChanged)
			MESSAGE_HANDLER(WM_KEYDOWN, OnKeyDown)
		}
		MESSAGE_HANDLER(WM_SETFOCUS, OnSetFocus)
		MESSAGE_HANDLER(WM_MOUSEACTIVATE, OnMouseActivate)
		MESSAGE_HANDLER(WM_SETTINGCHANGE, OnSettingChange)
	END_MSG_MAP()

	LRESULT OnCreate(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& bHandled)
	{
		T* pT = static_cast<T*>(this);
		pT->Init();

		bHandled = FALSE;
		return 1;
	}

	LRESULT OnPaint(UINT /*uMsg*/, WPARAM wParam, LPARAM /*lParam*/, BOOL& /*bHandled*/)
	{
		T* pT = static_cast<T*>(this);

		// try setting position if not set
		if((m_nSinglePane == SPLIT_PANE_NONE) && (m_xySplitterPos == -1))
			pT->SetSplitterPos();

		// do painting
		if(wParam != NULL)
		{
			pT->DrawSplitter((HDC)wParam);
		}
		else
		{
			CPaintDC dc(pT->m_hWnd);
			pT->DrawSplitter(dc.m_hDC);
		}

		return 0;
	}

	LRESULT OnSetCursor(UINT /*uMsg*/, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
	{
		T* pT = static_cast<T*>(this);
		if(((HWND)wParam == pT->m_hWnd) && (LOWORD(lParam) == HTCLIENT))
		{
			DWORD dwPos = ::GetMessagePos();
			POINT ptPos = { GET_X_LPARAM(dwPos), GET_Y_LPARAM(dwPos) };
			pT->ScreenToClient(&ptPos);
			if(IsOverSplitterBar(ptPos.x, ptPos.y))
				return 1;
		}

		bHandled = FALSE;
		return 0;
	}

	LRESULT OnMouseMove(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM lParam, BOOL& bHandled)
	{
		T* pT = static_cast<T*>(this);
		int xPos = GET_X_LPARAM(lParam);
		int yPos = GET_Y_LPARAM(lParam);
		if(::GetCapture() == pT->m_hWnd)
		{
			int xyNewSplitPos = 0;
			if(m_bVertical)
				xyNewSplitPos = xPos - m_rcSplitter.left - m_cxyDragOffset;
			else
				xyNewSplitPos = yPos - m_rcSplitter.top - m_cxyDragOffset;

			if(xyNewSplitPos == -1)   // avoid -1, that means default position
				xyNewSplitPos = -2;

			if(m_xySplitterPos != xyNewSplitPos)
			{
				if(m_bFullDrag)
				{
					if(pT->SetSplitterPos(xyNewSplitPos, true))
						pT->UpdateWindow();
				}
				else
				{
					DrawGhostBar();
					pT->SetSplitterPos(xyNewSplitPos, false);
					DrawGhostBar();
				}
			}
		}
		else		// not dragging, just set cursor
		{
			if(IsOverSplitterBar(xPos, yPos))
				::SetCursor(m_hCursor);
			bHandled = FALSE;
		}

		return 0;
	}

	LRESULT OnLButtonDown(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM lParam, BOOL& bHandled)
	{
		T* pT = static_cast<T*>(this);
		int xPos = GET_X_LPARAM(lParam);
		int yPos = GET_Y_LPARAM(lParam);
		if((::GetCapture() != pT->m_hWnd) && IsOverSplitterBar(xPos, yPos))
		{
			m_xySplitterPosNew = m_xySplitterPos;
			pT->SetCapture();
			m_hWndFocusSave = pT->SetFocus();
			::SetCursor(m_hCursor);
			if(!m_bFullDrag)
				DrawGhostBar();
			if(m_bVertical)
				m_cxyDragOffset = xPos - m_rcSplitter.left - m_xySplitterPos;
			else
				m_cxyDragOffset = yPos - m_rcSplitter.top - m_xySplitterPos;
		}
		else if((::GetCapture() == pT->m_hWnd) && !IsOverSplitterBar(xPos, yPos))
		{
			::ReleaseCapture();
		}

		bHandled = FALSE;
		return 1;
	}

	LRESULT OnLButtonUp(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& bHandled)
	{
		T* pT = static_cast<T*>(this);
		if(::GetCapture() == pT->m_hWnd)
		{
			m_xySplitterPosNew = m_xySplitterPos;
			::ReleaseCapture();
		}

		bHandled = FALSE;
		return 1;
	}

	LRESULT OnLButtonDoubleClick(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
	{
		T* pT = static_cast<T*>(this);
		pT->SetSplitterPos();   // default

		return 0;
	}

	LRESULT OnCaptureChanged(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
	{
		if(!m_bFullDrag)
			DrawGhostBar();

		if((m_xySplitterPosNew != -1) && (!m_bFullDrag || (m_xySplitterPos != m_xySplitterPosNew)))
		{
			m_xySplitterPos = m_xySplitterPosNew;
			m_xySplitterPosNew = -1;
			UpdateSplitterLayout();
			T* pT = static_cast<T*>(this);
			pT->UpdateWindow();
		}

		if(m_hWndFocusSave != NULL)
			::SetFocus(m_hWndFocusSave);

		return 0;
	}

	LRESULT OnKeyDown(UINT /*uMsg*/, WPARAM wParam, LPARAM /*lParam*/, BOOL& bHandled)
	{
		T* pT = static_cast<T*>(this);
		if(::GetCapture() == pT->m_hWnd)
		{
			switch(wParam)
			{
			case VK_RETURN:
				m_xySplitterPosNew = m_xySplitterPos;
				// FALLTHROUGH
			case VK_ESCAPE:
				::ReleaseCapture();
				break;
			case VK_LEFT:
			case VK_RIGHT:
				if(m_bVertical)
				{
					POINT pt = {};
					::GetCursorPos(&pt);
					int xyPos = m_xySplitterPos + ((wParam == VK_LEFT) ? -pT->m_cxyStep : pT->m_cxyStep);
					int cxyMax = m_rcSplitter.right - m_rcSplitter.left;
					if(xyPos < (m_cxyMin + m_cxyBarEdge))
						xyPos = m_cxyMin;
					else if(xyPos > (cxyMax - m_cxySplitBar - m_cxyBarEdge - m_cxyMin))
						xyPos = cxyMax - m_cxySplitBar - m_cxyBarEdge - m_cxyMin;
					pt.x += xyPos - m_xySplitterPos;
					::SetCursorPos(pt.x, pt.y);
				}
				break;
			case VK_UP:
			case VK_DOWN:
				if(!m_bVertical)
				{
					POINT pt = {};
					::GetCursorPos(&pt);
					int xyPos = m_xySplitterPos + ((wParam == VK_UP) ? -pT->m_cxyStep : pT->m_cxyStep);
					int cxyMax = m_rcSplitter.bottom - m_rcSplitter.top;
					if(xyPos < (m_cxyMin + m_cxyBarEdge))
						xyPos = m_cxyMin;
					else if(xyPos > (cxyMax - m_cxySplitBar - m_cxyBarEdge - m_cxyMin))
						xyPos = cxyMax - m_cxySplitBar - m_cxyBarEdge - m_cxyMin;
					pt.y += xyPos - m_xySplitterPos;
					::SetCursorPos(pt.x, pt.y);
				}
				break;
			default:
				break;
			}
		}
		else
		{
			bHandled = FALSE;
		}

		return 0;
	}

	LRESULT OnSetFocus(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM, BOOL& bHandled)
	{
		T* pT = static_cast<T*>(this);
		if(::GetCapture() != pT->m_hWnd)
		{
			if(m_nSinglePane == SPLIT_PANE_NONE)
			{
				if((m_nDefActivePane == SPLIT_PANE_LEFT) || (m_nDefActivePane == SPLIT_PANE_RIGHT))
					::SetFocus(m_hWndPane[m_nDefActivePane]);
			}
			else
			{
				::SetFocus(m_hWndPane[m_nSinglePane]);
			}
		}

		bHandled = FALSE;
		return 1;
	}

	LRESULT OnMouseActivate(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& /*bHandled*/)
	{
		T* pT = static_cast<T*>(this);
		LRESULT lRet = pT->DefWindowProc(uMsg, wParam, lParam);
		if((lRet == MA_ACTIVATE) || (lRet == MA_ACTIVATEANDEAT))
		{
			DWORD dwPos = ::GetMessagePos();
			POINT pt = { GET_X_LPARAM(dwPos), GET_Y_LPARAM(dwPos) };
			pT->ScreenToClient(&pt);
			RECT rcPane = {};
			for(int nPane = 0; nPane < m_nPanesCount; nPane++)
			{
				if(GetSplitterPaneRect(nPane, &rcPane) && (::PtInRect(&rcPane, pt) != FALSE))
				{
					m_nDefActivePane = nPane;
					break;
				}
			}
		}

		return lRet;
	}

	LRESULT OnSettingChange(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
	{
		T* pT = static_cast<T*>(this);
		pT->GetSystemSettings(true);

		return 0;
	}

// Implementation - internal helpers
	void Init()
	{
		m_hCursor = ::LoadCursor(NULL, m_bVertical ? IDC_SIZEWE : IDC_SIZENS);

		T* pT = static_cast<T*>(this);
		pT->GetSystemSettings(false);
	}

	void UpdateSplitterLayout()
	{
		if((m_nSinglePane == SPLIT_PANE_NONE) && (m_xySplitterPos == -1))
			return;

		T* pT = static_cast<T*>(this);
		RECT rect = {};
		if(m_nSinglePane == SPLIT_PANE_NONE)
		{
			if(GetSplitterBarRect(&rect))
				pT->InvalidateRect(&rect);

			for(int nPane = 0; nPane < m_nPanesCount; nPane++)
			{
				if(GetSplitterPaneRect(nPane, &rect))
				{
					if(m_hWndPane[nPane] != NULL)
						::SetWindowPos(m_hWndPane[nPane], NULL, rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, SWP_NOZORDER);
					else
						pT->InvalidateRect(&rect);
				}
			}
		}
		else
		{
			if(GetSplitterPaneRect(m_nSinglePane, &rect))
			{
				if(m_hWndPane[m_nSinglePane] != NULL)
					::SetWindowPos(m_hWndPane[m_nSinglePane], NULL, rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, SWP_NOZORDER);
				else
					pT->InvalidateRect(&rect);
			}
		}
	}

	bool GetSplitterBarRect(LPRECT lpRect) const
	{
		ATLASSERT(lpRect != NULL);
		if((m_nSinglePane != SPLIT_PANE_NONE) || (m_xySplitterPos == -1))
			return false;

		if(m_bVertical)
		{
			lpRect->left = m_rcSplitter.left + m_xySplitterPos;
			lpRect->top = m_rcSplitter.top;
			lpRect->right = m_rcSplitter.left + m_xySplitterPos + m_cxySplitBar + m_cxyBarEdge;
			lpRect->bottom = m_rcSplitter.bottom;
		}
		else
		{
			lpRect->left = m_rcSplitter.left;
			lpRect->top = m_rcSplitter.top + m_xySplitterPos;
			lpRect->right = m_rcSplitter.right;
			lpRect->bottom = m_rcSplitter.top + m_xySplitterPos + m_cxySplitBar + m_cxyBarEdge;
		}

		return true;
	}

	bool GetSplitterPaneRect(int nPane, LPRECT lpRect) const
	{
		ATLASSERT((nPane == SPLIT_PANE_LEFT) || (nPane == SPLIT_PANE_RIGHT));
		ATLASSERT(lpRect != NULL);
		bool bRet = true;
		if(m_nSinglePane != SPLIT_PANE_NONE)
		{
			if(nPane == m_nSinglePane)
				*lpRect = m_rcSplitter;
			else
				bRet = false;
		}
		else if(nPane == SPLIT_PANE_LEFT)
		{
			if(m_bVertical)
			{
				lpRect->left = m_rcSplitter.left;
				lpRect->top = m_rcSplitter.top;
				lpRect->right = m_rcSplitter.left + m_xySplitterPos;
				lpRect->bottom = m_rcSplitter.bottom;
			}
			else
			{
				lpRect->left = m_rcSplitter.left;
				lpRect->top = m_rcSplitter.top;
				lpRect->right = m_rcSplitter.right;
				lpRect->bottom = m_rcSplitter.top + m_xySplitterPos;
			}
		}
		else if(nPane == SPLIT_PANE_RIGHT)
		{
			if(m_bVertical)
			{
				lpRect->left = m_rcSplitter.left + m_xySplitterPos + m_cxySplitBar + m_cxyBarEdge;
				lpRect->top = m_rcSplitter.top;
				lpRect->right = m_rcSplitter.right;
				lpRect->bottom = m_rcSplitter.bottom;
			}
			else
			{
				lpRect->left = m_rcSplitter.left;
				lpRect->top = m_rcSplitter.top + m_xySplitterPos + m_cxySplitBar + m_cxyBarEdge;
				lpRect->right = m_rcSplitter.right;
				lpRect->bottom = m_rcSplitter.bottom;
			}
		}
		else
		{
			bRet = false;
		}

		return bRet;
	}

	bool IsOverSplitterRect(int x, int y) const
	{
		// -1 == don't check
		return (((x == -1) || ((x >= m_rcSplitter.left) && (x <= m_rcSplitter.right))) &&
			((y == -1) || ((y >= m_rcSplitter.top) && (y <= m_rcSplitter.bottom))));
	}

	bool IsOverSplitterBar(int x, int y) const
	{
		if(m_nSinglePane != SPLIT_PANE_NONE)
			return false;
		if((m_xySplitterPos == -1) || !IsOverSplitterRect(x, y))
			return false;
		int xy = m_bVertical ? x : y;
		int xyOff = m_bVertical ? m_rcSplitter.left : m_rcSplitter.top;

		return ((xy >= (xyOff + m_xySplitterPos)) && (xy < (xyOff + m_xySplitterPos + m_cxySplitBar + m_cxyBarEdge)));
	}

	void DrawGhostBar()
	{
		RECT rect = {};
		if(GetSplitterBarRect(&rect))
		{
			// convert client to window coordinates
			T* pT = static_cast<T*>(this);
			RECT rcWnd = {};
			pT->GetWindowRect(&rcWnd);
			::MapWindowPoints(NULL, pT->m_hWnd, (LPPOINT)&rcWnd, 2);
			::OffsetRect(&rect, -rcWnd.left, -rcWnd.top);

			// invert the brush pattern (looks just like frame window sizing)
			CBrush brush(CDCHandle::GetHalftoneBrush());
			if(brush.m_hBrush != NULL)
			{
				CWindowDC dc(pT->m_hWnd);
				CBrushHandle brushOld = dc.SelectBrush(brush);
				dc.PatBlt(rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, PATINVERT);
				dc.SelectBrush(brushOld);
			}
		}
	}

	void GetSystemSettings(bool bUpdate)
	{
		if((m_dwExtendedStyle & SPLIT_FIXEDBARSIZE) == 0)
		{
			m_cxySplitBar = ::GetSystemMetrics(m_bVertical ? SM_CXSIZEFRAME : SM_CYSIZEFRAME);
		}

		T* pT = static_cast<T*>(this);
		if((pT->GetExStyle() & WS_EX_CLIENTEDGE) != 0)
		{
			m_cxyBarEdge = 2 * ::GetSystemMetrics(m_bVertical ? SM_CXEDGE : SM_CYEDGE);
			m_cxyMin = 0;
		}
		else
		{
			m_cxyBarEdge = 0;
			m_cxyMin = 2 * ::GetSystemMetrics(m_bVertical ? SM_CXEDGE : SM_CYEDGE);
		}

		::SystemParametersInfo(SPI_GETDRAGFULLWINDOWS, 0, &m_bFullDrag, 0);

		if(bUpdate)
			UpdateSplitterLayout();
	}

	bool IsProportional() const
	{
		return ((m_dwExtendedStyle & SPLIT_PROPORTIONAL) != 0);
	}

	void StoreProportionalPos()
	{
		int cxyTotal = m_bVertical ? (m_rcSplitter.right - m_rcSplitter.left - m_cxySplitBar - m_cxyBarEdge) : (m_rcSplitter.bottom - m_rcSplitter.top - m_cxySplitBar - m_cxyBarEdge);
		if(cxyTotal > 0)
			m_nProportionalPos = ::MulDiv(m_xySplitterPos, m_nPropMax, cxyTotal);
		else
			m_nProportionalPos = 0;
		ATLTRACE2(atlTraceUI, 0, _T("CSplitterImpl::StoreProportionalPos - %i\n"), m_nProportionalPos);
	}

	void UpdateProportionalPos()
	{
		int cxyTotal = m_bVertical ? (m_rcSplitter.right - m_rcSplitter.left - m_cxySplitBar - m_cxyBarEdge) : (m_rcSplitter.bottom - m_rcSplitter.top - m_cxySplitBar - m_cxyBarEdge);
		if(cxyTotal > 0)
		{
			int xyNewPos = ::MulDiv(m_nProportionalPos, cxyTotal, m_nPropMax);
			m_bUpdateProportionalPos = false;
			T* pT = static_cast<T*>(this);
			pT->SetSplitterPos(xyNewPos, false);
		}
	}

	bool IsRightAligned() const
	{
		return ((m_dwExtendedStyle & SPLIT_RIGHTALIGNED) != 0);
	}

	void StoreRightAlignPos()
	{
		int cxyTotal = m_bVertical ? (m_rcSplitter.right - m_rcSplitter.left - m_cxySplitBar - m_cxyBarEdge) : (m_rcSplitter.bottom - m_rcSplitter.top - m_cxySplitBar - m_cxyBarEdge);
		if(cxyTotal > 0)
			m_nProportionalPos = cxyTotal - m_xySplitterPos;
		else
			m_nProportionalPos = 0;
		ATLTRACE2(atlTraceUI, 0, _T("CSplitterImpl::StoreRightAlignPos - %i\n"), m_nProportionalPos);
	}

	void UpdateRightAlignPos()
	{
		int cxyTotal = m_bVertical ? (m_rcSplitter.right - m_rcSplitter.left - m_cxySplitBar - m_cxyBarEdge) : (m_rcSplitter.bottom - m_rcSplitter.top - m_cxySplitBar - m_cxyBarEdge);
		if(cxyTotal > 0)
		{
			m_bUpdateProportionalPos = false;
			T* pT = static_cast<T*>(this);
			pT->SetSplitterPos(cxyTotal - m_nProportionalPos, false);
		}
	}

	bool IsInteractive() const
	{
		return ((m_dwExtendedStyle & SPLIT_NONINTERACTIVE) == 0);
	}
};


///////////////////////////////////////////////////////////////////////////////
// CSplitterWindowImpl - Implements a splitter window

template <class T, class TBase = ATL::CWindow, class TWinTraits = ATL::CControlWinTraits>
class ATL_NO_VTABLE CSplitterWindowImpl : public ATL::CWindowImpl< T, TBase, TWinTraits >, public CSplitterImpl< T >
{
public:
	DECLARE_WND_CLASS_EX2(NULL, T, CS_DBLCLKS, COLOR_WINDOW)

	CSplitterWindowImpl(bool bVertical = true) : CSplitterImpl< T >(bVertical)
	{ }

	BOOL SubclassWindow(HWND hWnd)
	{
		BOOL bRet = ATL::CWindowImpl< T, TBase, TWinTraits >::SubclassWindow(hWnd);
		if(bRet != FALSE)
		{
			T* pT = static_cast<T*>(this);
			pT->Init();

			this->SetSplitterRect();
		}

		return bRet;
	}

	BEGIN_MSG_MAP(CSplitterWindowImpl)
		MESSAGE_HANDLER(WM_ERASEBKGND, OnEraseBackground)
		MESSAGE_HANDLER(WM_SIZE, OnSize)
		CHAIN_MSG_MAP(CSplitterImpl< T >)
		FORWARD_NOTIFICATIONS()
	END_MSG_MAP()

	LRESULT OnEraseBackground(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
	{
		// handled, no background painting needed
		return 1;
	}

	LRESULT OnSize(UINT /*uMsg*/, WPARAM wParam, LPARAM /*lParam*/, BOOL& bHandled)
	{
		if(wParam != SIZE_MINIMIZED)
			this->SetSplitterRect();

		bHandled = FALSE;
		return 1;
	}
};


///////////////////////////////////////////////////////////////////////////////
// CSplitterWindow/CHorSplitterWindow - Implements splitter windows to be used as is

template <bool t_bVertical = true>
class CSplitterWindowT : public CSplitterWindowImpl<CSplitterWindowT<t_bVertical> >
{
public:
	DECLARE_WND_CLASS_EX2(_T("WTL_SplitterWindow"), CSplitterWindowT<t_bVertical>, CS_DBLCLKS, COLOR_WINDOW)

	CSplitterWindowT() : CSplitterWindowImpl<CSplitterWindowT<t_bVertical> >(t_bVertical)
	{ }
};

typedef CSplitterWindowT<true>    CSplitterWindow;
typedef CSplitterWindowT<false>   CHorSplitterWindow;

} // namespace WTL

#endif // __ATLSPLIT_H__
