StyleDialog - A transparent dialog class with an optional custom frame

//
// StyleDialog.h: header file for the StyleDialog class.
//
// Author:  Darren Sessions
//          
//
// Description:
//   
//		The StyleDialog class allows the use of transparency and layers
//		when implementing a dialog.
//
// History
//     Version 1.1 - 2008 August 1
//     - Initial 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.
//
///////////////////////////////////////////////////////////////////////////////

#pragma once

#include "..\resource.h"

// comment out this line if Style Toolkit is not used
#define USE_STYLE_TOOLKIT

// comment out this line if layered windows is not supported - needed for transparency
#define USE_LAYERED_WINDOWS

#ifdef USE_STYLE_TOOLKIT
#include "StyleButton.h"
#endif

class StyleDialog :	public CDialog
{
public:
	StyleDialog();
	StyleDialog(UINT nIDTemplate, CWnd* pParentWnd = NULL);
	StyleDialog(LPCTSTR lpszTemplateName, CWnd* pParentWnd = NULL);

	~StyleDialog(void);

	void	Init();

	void	SetTitle(CString Title)	{ m_csTitle = Title; }
	
	void	SetTransparent(BOOL bTransparent = TRUE);
	void	GetFrameRect(LPRECT lpRect);
	void	GetTitleRect(LPRECT lpRect);
	void	SetClientRect(CRect rect);
	void	SetTransparentRect(CRect rect);

	void	GetClientRect(LPRECT lpRect);

	COLORREF	m_OpaqueColor;
	void		SetOpaqueColor(COLORREF clr) { m_OpaqueColor = clr; }

	int			m_bUseOpaqueStyle;

#ifdef USE_STYLE_TOOLKIT
	Style		m_BackGroundStyle;
	Style		m_OpaqueStyle;
	void		AddOpaqueStyle(Style style);
	void		AddBackGroundStyle(Style style);

	StyleButton m_cCancel;
	StyleButton m_cMinimize;
	StyleButton m_cAbout;
#endif

	afx_msg void OnSdClose()		{ OnCancel(); }
	afx_msg void OnSdMinimize()		{ ShowWindow(SW_MINIMIZE); }
	afx_msg void OnSdAbout()		{ SendMessage(WM_SYSCOMMAND, IDM_ABOUTBOX, 0); }

	#define CTRL_CLIENT			(1 << 0)
	#define CTRL_CANCEL			(1 << 1)
	#define CTRL_MINIMIZE		(1 << 2)
	#define CTRL_ABOUT			(1 << 3)
	#define ALL_CONTROLS		(CTRL_CLIENT | CTRL_CANCEL | CTRL_MINIMIZE | CTRL_ABOUT)

	int		m_Controls;
	void	SetControls(int ctrls)	{ m_Controls = ctrls; }

	
protected:
	virtual void DoDataExchange(CDataExchange* pDX);	// DDX/DDV support


private:

	void UpdateFrameControls(CDC* pDC);

	BOOL		m_bTransparent;

	BOOL		m_bIsDragging;
	BOOL		m_bBackgroundChanged;

	CRect		m_TitleRect;
	CRect		m_FrameRect;
	CRect		m_ClientRect;
	CRect		m_TransRect;

	CPoint		m_FrameOffset;

	CString		m_csTitle;
	CStatic		m_cClient;

	int			m_TransState;
	CPoint		m_GrabPoint;

	enum TransparentState
	{
		DISABLED		= 0,
		ACTIVE,
		INACTIVE
	};

public:
	DECLARE_MESSAGE_MAP()
	virtual BOOL OnInitDialog();
	afx_msg BOOL OnEraseBkgnd(CDC* pDC);
	afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
	afx_msg void OnLButtonUp(UINT nFlags, CPoint point);
	afx_msg void OnMouseMove(UINT nFlags, CPoint point);
	afx_msg void OnWindowPosChanging(WINDOWPOS* lpwndpos);
	afx_msg void OnActivate(UINT nState, CWnd* pWndOther, BOOL bMinimized);
	afx_msg void OnRButtonDown(UINT nFlags, CPoint point);
	afx_msg void OnNcLButtonDown(UINT nHitTest, CPoint point);
};