Style Toolkit - Use advanced graphics techniques to create a custom user interface

//
// StyleEdit.cpp : Version 1.0 - see article at CodeProject.com
//
// Author:  Darren Sessions
//          
//
// Description:
//     StyleEdit is a CEdit derived control that uses the Style class
//	   and GDI+ to support different styles
//
// History
//		Version 1.1 - 2008 July 25
//		- Fixed incorrect string in OnNcPaint during some repaint operations
//
//		Version 1.0 - 2008 June 20
//		- Initial public release
//
// License:
//     This software is released under the Code Project Open License (CPOL),
//     which may be found here:  http://www.codeproject.com/info/eula.aspx
//     You are free to use this software in any way you like, except that you 
//     may not sell this source code.
//
//     This software is provided "as is" with no expressed or implied warranty.
//     I accept no liability for any damage or loss of business that this 
//     software may cause.
//
///////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "StyleEdit.h"

#include "colors.h"

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

/////////////////////////////////////////////////////////////////////////////
// StyleEdit

StyleEdit::StyleEdit()
	:m_EditRect(0,0,0,0)
{
	m_OffsetY = -1;
	m_HollowBrush.CreateStockObject(HOLLOW_BRUSH);
	m_TextColor = Black;
}

StyleEdit::~StyleEdit()
{
}

void StyleEdit::SetStack(Stack stack)
{
	Rect r(stack.Frame.frect);
	CRect cr(r.X, r.Y, r.X + r.Width, r.Y + r.Height);
	m_EditRect = cr;
	m_Style.AddStack(stack);
}
void StyleEdit::SetTextClr(COLORREF clr)
{
	m_TextColor = clr;
}

BEGIN_MESSAGE_MAP(StyleEdit, CEdit)
	ON_WM_CTLCOLOR_REFLECT()
	ON_WM_ERASEBKGND()
	ON_CONTROL_REFLECT(EN_UPDATE, OnUpdate)
	ON_WM_NCCALCSIZE()
	ON_WM_NCPAINT()
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// StyleEdit message handlers

HBRUSH StyleEdit::CtlColor(CDC* pDC, UINT nCtlColor) 
{
	pDC->SetBkMode(TRANSPARENT);
	pDC->SetTextColor(m_TextColor);
    return (HBRUSH)m_HollowBrush;
}

BOOL StyleEdit::OnEraseBkgnd(CDC* pDC) 
{
	m_Style.SetPosition(0, m_OffsetY);
	m_Style.PaintStyle(pDC, m_EditRect);
	return TRUE;
}

void StyleEdit::OnUpdate() 
{
	Invalidate(); 
}

// center text vertically
void StyleEdit::OnNcCalcSize(BOOL bCalcValidRects, NCCALCSIZE_PARAMS* lpncsp)
{
	CRect rectWnd, rectClient;
	
	//calculate client area height needed for a font
	CFont *pFont = GetFont();
	CRect rectText;
	rectText.SetRectEmpty();
	
	CDC *pDC = GetDC();
	
	CFont *pOld = pDC->SelectObject(pFont);
	pDC->DrawText(_T("Eb"), rectText, DT_CALCRECT | DT_LEFT);
	UINT uiVClientHeight = rectText.Height();
	
	pDC->SelectObject(pOld);
	ReleaseDC(pDC);
	
	//calculate NC area to center text.
	
	GetClientRect(rectClient);
	GetWindowRect(rectWnd);

	ClientToScreen(rectClient);

	UINT uiCenterOffset = (rectClient.Height() - uiVClientHeight) / 2;
	UINT uiCY = (rectWnd.Height() - rectClient.Height()) / 2;
	UINT uiCX = (rectWnd.Width() - rectClient.Width()) / 2;

	m_OffsetY = -(int)uiCenterOffset;

	lpncsp->rgrc[0].top +=uiCenterOffset;
	lpncsp->rgrc[0].bottom -= uiCenterOffset;

	lpncsp->rgrc[0].left +=uiCX;
	lpncsp->rgrc[0].right -= uiCY;
}

BOOL StyleEdit::OnChildNotify(UINT message, WPARAM wParam, LPARAM lParam, LRESULT* pLResult)
{
	if(m_OffsetY == -1)
	{
		SetWindowPos(NULL, 0, 0, 0, 0, SWP_NOOWNERZORDER | SWP_NOSIZE | SWP_NOMOVE | SWP_FRAMECHANGED);
	}

	return CEdit::OnChildNotify(message, wParam, lParam, pLResult);
}

void StyleEdit::OnNcPaint()
{
	Default();

	CWindowDC dc(this);

	CString str;
	GetWindowText(str);
	m_Style.SetPosition(0, 0);
	m_Style.PaintStyle(&dc, m_EditRect);
	SetWindowText(str);
}