Form Designer

// TabNumber.cpp: implementation of the CTabNumber class.
//
// Author : David Shepherd
//			Copyright (c) 2002, DaeDoe-Software
//
/////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "TabNumber.h"

// border width
#define BORDER_WIDTH	4
// border height
#define BORDER_HEIGHT	0

/////////////////////////////////////////////////////////////////////////////
// CTabNumber

CTabNumber::CTabNumber()
{
	// initialise everything
	m_BackColor=MAKE_OLE_COLOR(COLOR_HIGHLIGHT);
	m_ForeColor=MAKE_OLE_COLOR(COLOR_HIGHLIGHTTEXT);
	m_TabNumber=0;
}

CTabNumber::~CTabNumber()
{
	// clean up
}

CSize CTabNumber::CalcRequiredWindowSize(DWORD MaxTabNumber)
{
	// get the number of digits in the maximum tab number
	TCHAR Buf[16]=_T("");
	(void)_itot(MaxTabNumber,Buf,10);
	long MaxDigits=_tcslen(Buf);

	// create the widest possible string
	FillMemory(Buf,MaxDigits,_T('8'));

	// calculate the required window size
	CClientDC dc(*this);
	CSize Size(0,0);
	(void)dc.GetTextExtent(Buf,MaxDigits,&Size);

	// add the border width and height
	Size.cx+=2*BORDER_WIDTH;
	Size.cy+=2*BORDER_HEIGHT;
	return Size;
}

void CTabNumber::SetColors(OLE_COLOR BackColor,OLE_COLOR ForeColor)
{
	// if the colors are changing a redraw will be required
	if(m_BackColor!=BackColor or m_ForeColor!=ForeColor)
	{
		if(IsWindow())
		{
			(void)Invalidate(FALSE);
		}
	}
	// set the colors
	m_BackColor=BackColor;
	m_ForeColor=ForeColor;
}

void CTabNumber::GetColors(OLE_COLOR &BackColor,OLE_COLOR &ForeColor) const
{
	// return the colors
	BackColor=m_BackColor;
	ForeColor=m_ForeColor;
}

BOOL CTabNumber::Create(const CWindow &Parent,
	const CWindow &AssociatedWindow,DWORD MaxTabNumber)
{
	// check parameters
	ATLASSERT(::IsWindow(Parent));
	ATLASSERT(::IsWindow(AssociatedWindow));

	// save settings
	m_AssociatedWindow=AssociatedWindow;

	// create the tab number
	ATLASSERT(IsWindow()==FALSE);
	if(CWindowImpl<CTabNumber>::Create(Parent,
		CRect(CPoint(0,0),CalcRequiredWindowSize(MaxTabNumber)),
			_T("TabNumber"),WS_CHILD|WS_VISIBLE|WS_DISABLED)==NULL)
	{
		return FALSE;
	}
	AutoPosition();	// auto position
	return TRUE;
}

void CTabNumber::AutoPosition()
{
	// get the associated window rectangle
	CRect Rect(0,0,0,0);
	(void)m_AssociatedWindow.GetWindowRect(Rect);

	// convert to our parents coordinates
	CWindow Parent(GetParent());
	(void)Parent.ScreenToClient(Rect);

	// auto position the tab number
	(void)SetWindowPos(NULL,Rect,SWP_NOZORDER|SWP_NOSIZE);
}

void CTabNumber::SetTabNumber(DWORD TabNumber)
{
	// set the tab number
	if(m_TabNumber!=TabNumber)
	{
		m_TabNumber=TabNumber;
		(void)Invalidate(FALSE);
	}
}

DWORD CTabNumber::GetTabNumber() const
{
	// get the tab number
	return m_TabNumber;
}

LRESULT CTabNumber::OnPaint(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
	// get the paint device context
	CPaintDC dc(*this);
	if(dc==NULL)
	{
		return 0;
	}
	// get the client rect
	CRect ClientRect(0,0,0,0);
	if(GetClientRect(ClientRect)==FALSE)
	{
		return 0;
	}
	// set background color
	COLORREF RGBBackColor=RGB(0,0,0);
	if(!SUCCEEDED(OleTranslateColor(m_BackColor,NULL,&RGBBackColor)))
	{
		return 0;
	}
	if(dc.SetBkColor(RGBBackColor)==CLR_INVALID)
	{
		return 0;
	}
	// set foreground color
	COLORREF RGBForeColor=RGB(0,0,0);
	if(!SUCCEEDED(OleTranslateColor(m_ForeColor,NULL,&RGBForeColor)))
	{
		return 0;
	}
	if(dc.SetTextColor(RGBForeColor)==CLR_INVALID)
	{
		return 0;
	}
	// fill in the background
	dc.FillSolidRect(ClientRect,RGBBackColor);
	// convert the tab number to text
	TCHAR Buf[16]=_T("");
	(void)_itot(m_TabNumber,Buf,10);
	// draw the text
	if(dc.DrawText(
		Buf,-1,ClientRect,DT_CENTER|DT_SINGLELINE|DT_VCENTER)==0)
	{
		return 0;
	}
	return 0;
}

LRESULT CTabNumber::OnEraseBkgnd(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
	// to prevent flicker do not erase the background
	return TRUE;
}