Double Buffered DC Class

// PiranhaMessage.cpp : implementation file
//

#include "stdafx.h"
#include "akBufferedDC.h"
#include ".\MessageWnd.h"

#include "akBufferedDC\akBufferedDC.h"


// CMessageWnd
const UINT CMessageWnd::WM_CLOSECLICKED = RegisterWindowMessage(_T("msgwnd{AE66E755-AEC8-4455-89DA-CD7E61C4F726}"));

IMPLEMENT_DYNAMIC(CMessageWnd, CWnd)
CMessageWnd::CMessageWnd()
    : m_MouseOver(false)
    , m_MouseDown(false)
{
    m_CloseBtn.SetRectEmpty();
    //  Create font
    LOGFONT lf;
    ::GetObject(::GetStockObject(DEFAULT_GUI_FONT), sizeof(LOGFONT), &lf);
    strcpy(lf.lfFaceName, _T("Tahoma"));
    m_Font.CreateFontIndirect(&lf);
}

CMessageWnd::~CMessageWnd()
{
}


BEGIN_MESSAGE_MAP(CMessageWnd, CWnd)
    ON_WM_PAINT()
    ON_WM_MOUSEMOVE()
    ON_MESSAGE(WM_MOUSELEAVE, OnMouseLeave)
    ON_WM_ERASEBKGND()
    ON_WM_LBUTTONDOWN()
    ON_WM_LBUTTONUP()
    ON_WM_SIZE()
END_MESSAGE_MAP()



// CMessageWnd message handlers

void CMessageWnd::OnPaint()
{
//    CPaintDC dc(this);                                      // device context for painting
    CakBufferedDC dc(this);                                 // device context for painting

    //  Get client rectangle
    CRect Client;
    GetClientRect(&Client);

    CBrush BkBrush(GetSysColor(COLOR_BTNFACE));
    dc.FillRect(&Client, &BkBrush);

    CPen *oldPen;

    //  Fill message background
    CPen DarkPen(PS_SOLID, 1, GetSysColor(COLOR_3DSHADOW));
    oldPen = dc.SelectObject(&DarkPen);
    CBrush InfoBk(GetSysColor(COLOR_INFOBK)), *oldBrush;
    oldBrush = dc.SelectObject(&InfoBk);
    Client.DeflateRect(2, 2, 2, 2);
    dc.Rectangle(&Client);
    dc.SelectObject(oldBrush);
    dc.SelectObject(oldPen);

    //  Setup font
    COLORREF oldFntColor = dc.SetTextColor(COLOR_INFOTEXT);
    CFont *oldFnt = dc.SelectObject(&m_Font);
    int oldBkMode = dc.SetBkMode(TRANSPARENT);
    Client.DeflateRect(2, 2);
    Client.left += 4;
    Client.right -= 4;
    dc.DrawText(m_Message, &Client, DT_WORDBREAK | DT_VCENTER);
    dc.SelectObject(oldFnt);
    dc.SetTextColor(oldFntColor);
    dc.SetBkMode(oldBkMode);

    //  Draw close button if mouse is over window
    RepaintCloseButton(&dc);
}

void CMessageWnd::OnMouseMove(UINT nFlags, CPoint point)
{
    if (!m_MouseOver)
    {
        m_MouseOver = true;
        m_MouseDown = false;
        //  Track mouse movement
        TRACKMOUSEEVENT tme = { 0 };
        tme.cbSize = sizeof(TRACKMOUSEEVENT);
        tme.dwFlags = TME_LEAVE;
        tme.hwndTrack = this->m_hWnd;
        TrackMouseEvent(&tme);
    }
    RepaintCloseButton();

    CWnd::OnMouseMove(nFlags, point);
}

LRESULT CMessageWnd::OnMouseLeave(WPARAM, LPARAM)
{
    if (m_MouseOver)
    {
        m_MouseOver = false;
        m_MouseDown = false;
        //  Stop tracking mouse movement
        TRACKMOUSEEVENT tme = { 0 };
        tme.cbSize = sizeof(TRACKMOUSEEVENT);
        tme.dwFlags = TME_LEAVE | TME_CANCEL;
        tme.hwndTrack = this->m_hWnd;
        TrackMouseEvent(&tme);
        //  Repaint
        RedrawWindow();
    }

    return 0;
}

int CMessageWnd::GetHeight()
{
    CClientDC dc(this);
    //  Get height of the font
    CFont *old = dc.SelectObject(&m_Font);
    TEXTMETRIC tm;
    dc.GetTextMetrics(&tm);
    int Result = tm.tmHeight * 5 + 10;
    dc.SelectObject(old);

    return Result;
}

void CMessageWnd::SetMessage(const CString &Message)
{
    m_Message = Message;
    RedrawWindow();
}

BOOL CMessageWnd::OnEraseBkgnd(CDC* pDC)
{
    return TRUE;
}

void CMessageWnd::OnLButtonDown(UINT nFlags, CPoint point)
{
    if (m_MouseOver)
    {
        m_MouseDown = true;
        RepaintCloseButton();
        return;
    }

    CWnd::OnLButtonDown(nFlags, point);
}

void CMessageWnd::OnLButtonUp(UINT nFlags, CPoint point)
{
    if (m_MouseOver)
    {
        m_MouseDown = false;
        RepaintCloseButton();
        if (m_CloseBtn.PtInRect(Mouse()))
            GetParent()->PostMessage(WM_CLOSECLICKED);
        return;
    }

    CWnd::OnLButtonUp(nFlags, point);
}

POINT CMessageWnd::Mouse()
{
    POINT pt;
    GetCursorPos(&pt);
    ScreenToClient(&pt);

    return pt;
}

void CMessageWnd::RepaintCloseButton(CDC *pPaintDC/* = 0*/)
{
    if (!m_MouseOver)
        return;

    CClientDC dc(this);
    CDC *pdc = (pPaintDC) ? pPaintDC : &dc;

    UINT State = DFCS_CAPTIONCLOSE;
    if (m_CloseBtn.PtInRect(Mouse()))
    {
        if (m_MouseDown)
            State |= DFCS_PUSHED;
    }
    pdc->DrawFrameControl(&m_CloseBtn, DFC_CAPTION, State);
}

void CMessageWnd::OnSize(UINT nType, int cx, int cy)
{
    CWnd::OnSize(nType, cx, cy);

    CRect Client;
    GetClientRect(&Client);
    m_CloseBtn = Client;
    m_CloseBtn.left = m_CloseBtn.right - 16;
    m_CloseBtn.bottom = m_CloseBtn.top + 16;
    m_CloseBtn.OffsetRect(-6, 6);
}