An extendable report editor

// WndSplit.cpp: implementation of the CWndSplit class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "WndSplit.h"
#include "mem_tool.h"
#include "global.h"
#include "canvas.h"

#define SPLIT_WND_CLASS_NAME "split_simple_wnd"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CWndSplit::CWndSplit()
{
    this->InitBasic();
}
CWndSplit::~CWndSplit()
{
    this->Destroy();
}
int CWndSplit::InitBasic()
{
	CWnd::InitBasic();

	m_nWidth = 8;
	m_hbm = NULL;
	m_hbrDithered = NULL;
	m_nOldBarPos = 0;
	m_nBarpreMove = 0;
	this->m_nBarPos = 0;
	this->m_bCapture = false;
	this->m_bVertical = true;
	this->pane0 = NULL;
	this->pane1 = NULL;
	
	memset(&this->border_rect,0,sizeof(RECT));

    return OK;
}
int CWndSplit::Init()
{
    this->InitBasic();
	CWnd::Init();
	
	m_nWidth = 6;
	WORD HashPattern[] = {0x55,0xAA,0x55,0xAA,0x55,0xAA,0x55,0xAA};
	m_hbm = ::CreateBitmap (8, 8, 1, 1, HashPattern);
	m_hbrDithered = ::CreatePatternBrush (m_hbm);
	m_nOldBarPos = m_nBarPos;
	m_nBarpreMove = m_nBarPos;
	this->m_bCapture = false;
	this->m_bVertical = true;
	
	this->wnd_create->style = WS_CHILD|WS_VISIBLE;	
	this->wnd_create->class_name = SPLIT_WND_CLASS_NAME;

    return OK;
}

int  CWndSplit::Destroy()
{
	if(this->m_hbrDithered)
	{
		::DeleteObject(m_hbrDithered);
		this->m_hbrDithered = NULL;
	}
	if(this->m_hbm)
	{
		::DeleteObject(m_hbm);
		this->m_hbm = NULL;
	}
	
	CWnd::Destroy();
    this->InitBasic();
    return OK;
}
int CWndSplit::OnLButtonDown(WPARAM wparam,LPARAM lparam)
{
	::SetCapture(hwnd);
	m_bCapture = true;
	DrawBar(m_nBarPos);
	m_nBarpreMove = m_nBarPos;

	return OK;
}
int CWndSplit::OnPaint(WPARAM wparam,LPARAM lparam)
{	
	CCanvas can;
	PAINTSTRUCT ps;
	RECT r;

	can.Init();

	HDC hdc = ::BeginPaint(this->hwnd,&ps);

	::GetClientRect(this->hwnd,&r);
	can.AttachDC(hdc);	
	can.SetPen(PS_SOLID,0,RGB(120,152,181));
	
	can.MoveTo(0,0);can.LineTo(0,r.bottom);
	can.MoveTo(r.right-1,0);can.LineTo(r.right-1,r.bottom);

	::EndPaint(this->hwnd,&ps);

	return OK;
}
int CWndSplit::OnLButtonUp(WPARAM wparam,LPARAM lparam)
{
	DrawBar(m_nBarPos);
	::ReleaseCapture();
	
	RecalcLayout(this->border_rect);
	m_bCapture = false;

	SendMessage(this->wnd_create->hparent,WM_SPLIT_DRAG_END,0,(LPARAM)this->hwnd);

	return OK;
}
int CWndSplit::OnMouseMove(WPARAM wparam,LPARAM lparam)
{
	if (m_bCapture)
	{
		POINT pt = {0};
		static POINT Oldpt = {0};
		::GetCursorPos(&pt);
		::ScreenToClient (this->wnd_create->hparent, &pt);

		if ((pt.x == Oldpt.x) && (pt.y == Oldpt.y))
			return ERROR;

		Oldpt.x = pt.x;
		Oldpt.y = pt.y;

		int cx = this->border_rect.right - this->border_rect.left;
		int cy = this->border_rect.bottom - this->border_rect.top;

		if (m_bVertical)
		{
			m_nBarPos = pt.x;
			if (m_nBarPos < m_nWidth/2)
				m_nBarPos = m_nWidth/2;

			if (m_nBarPos > (cx - m_nWidth/2))
				m_nBarPos = cx - m_nWidth/2;
		}
		else
		{
			m_nBarPos = pt.y;
			if (m_nBarPos < (m_nWidth/2))
				m_nBarPos = m_nWidth/2;

			if (m_nBarPos > (cy - m_nWidth/2))
				m_nBarPos = cy - m_nWidth/2;
		}

		DrawBar(m_nOldBarPos);
		DrawBar(m_nBarPos);

		m_nOldBarPos = m_nBarPos;
	}

	return OK;
}
int CWndSplit::Registe()
{       
    WNDCLASSEX wcex;    

    wcex.cbSize             = sizeof(WNDCLASSEX); 
    wcex.style              = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc        = (WNDPROC)WndProc;
    wcex.cbClsExtra         = 0;
    wcex.cbWndExtra         = 0;
    wcex.hInstance          = ::GetModuleHandle(NULL);
    wcex.hIcon              = NULL;
	if (m_bVertical)
	    wcex.hCursor            = ::LoadCursor (NULL, IDC_SIZEWE);
	else
		wcex.hCursor            = ::LoadCursor (NULL, IDC_SIZENS);
    wcex.hbrBackground      = (HBRUSH)(COLOR_BTNFACE+1);
    wcex.lpszMenuName       = NULL;
    wcex.lpszClassName      = SPLIT_WND_CLASS_NAME;
    wcex.hIconSm            = NULL;
    
	RegisterClassEx(&wcex);     
    
	return OK;
}

int CWndSplit::DrawBar(int Pos)
{
	if (m_bCapture)
	{
		HDC hDC = ::GetDC(this->wnd_create->hparent);
		HBRUSH hOldBrush = (HBRUSH)::SelectObject(hDC, (HBRUSH)m_hbrDithered);

		int cx = this->border_rect.right - this->border_rect.left;
		int cy = this->border_rect.bottom - this->border_rect.top;

		if (m_bVertical)
			::PatBlt (hDC, Pos - m_nWidth/2, this->border_rect.top, m_nWidth, cy, PATINVERT);
		else
			::PatBlt (hDC, this->border_rect.left, Pos - m_nWidth/2, cx, m_nWidth, PATINVERT);

		// Clean up
		::SelectObject(hDC, hOldBrush);
		::ReleaseDC(this->wnd_create->hparent, hDC);
	}

	return OK;
}

int CWndSplit::RecalcLayout(RECT r)
{

	int cx = r.right - r.left;
	int cy = r.bottom - r.top;
	int w2 = m_nWidth / 2;
	
	memcpy(&this->border_rect,&r,sizeof(RECT));

	if (m_bVertical)
	{
		// Reposition our window panes and bar
		::SetWindowPos(pane0, NULL, 0, 0, m_nBarPos - w2, cy, SWP_SHOWWINDOW );
		::SetWindowPos(pane1, NULL, m_nBarPos - w2 + m_nWidth, r.top, cx - m_nBarPos - m_nWidth + w2, cy, SWP_SHOWWINDOW );
		::SetWindowPos(this->hwnd, NULL, m_nBarPos - w2, r.top, m_nWidth, cy, SWP_SHOWWINDOW );
	}
	else
	{
		// Reposition our window panes and bar
		::SetWindowPos(pane0, NULL, 0, 0, cx, m_nBarPos - w2, SWP_SHOWWINDOW );
		::SetWindowPos(pane1, NULL, 0, m_nBarPos - w2 + m_nWidth, cx, cy - m_nBarPos - m_nWidth + w2, SWP_SHOWWINDOW );
		::SetWindowPos(this->hwnd, NULL, r.top, m_nBarPos - w2, cx, m_nWidth , SWP_SHOWWINDOW );
	}

	return OK;
}

int CWndSplit::RecalcLayout()
{
	if(hwnd == NULL)
		return ERROR;

	::GetClientRect(this->wnd_create->hparent, &this->border_rect);
	this->RecalcLayout(this->border_rect);

	return OK;
}

int CWndSplit::SetBarPos(int pos)
{
	this->m_nOldBarPos = pos;
	this->m_nBarPos = pos;
	this->RecalcLayout(this->border_rect);

	return OK;
}

int CWndSplit::GetPos() 
{
	return this->m_nBarPos;
}