Tricks of the Windows Gam…ming Gurus (2nd Edition)/Disc2.iso/vc98/mfc/src/olebar.cpp

C/C++ Source or Header | 1998-06-16 | 4.8 KB | 187 lines

// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1998 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.

#include "stdafx.h"

#ifdef AFX_OLE4_SEG
#pragma code_seg(AFX_OLE4_SEG)
#endif

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

#define new DEBUG_NEW

/////////////////////////////////////////////////////////////////////////////
// COleResizeBar

COleResizeBar::COleResizeBar()
{
    // setup the state flags to do resize handles outside with hatched border
    m_tracker.m_nStyle =
        CRectTracker::hatchedBorder|CRectTracker::resizeOutside|
        CRectTracker::solidLine;

    // the actual rectangle is updated in COleResizeBar::OnSize
}

COleResizeBar::~COleResizeBar()
{
}

BOOL COleResizeBar::Create(CWnd* pParentWnd, DWORD dwStyle, UINT nID)
{
    ASSERT_VALID(this);

    if (pParentWnd != NULL)
        ASSERT_VALID(pParentWnd);   // must have a parent

    // force WS_CLIPSIBLINGS (avoids SetWindowPos bugs)
    dwStyle |= WS_CLIPSIBLINGS;

    VERIFY(AfxDeferRegisterClass(AFX_WNDCONTROLBAR_REG));

    // create the HWND
    CRect rect;
    rect.SetRectEmpty();
    // Note: Parent must resize itself for control bar to be resized
    return CWnd::Create(AFX_WNDCONTROLBAR, NULL, dwStyle, rect, pParentWnd, nID);
}

/////////////////////////////////////////////////////////////////////////////
// COleResizeBar message handling

BEGIN_MESSAGE_MAP(COleResizeBar, CControlBar)
    //{{AFX_MSG_MAP(COleResizeBar)
    ON_WM_ERASEBKGND()
    ON_WM_PAINT()
    ON_WM_SIZE()
    ON_WM_SETCURSOR()
    ON_WM_LBUTTONDOWN()
    ON_MESSAGE(WM_SIZEPARENT, OnSizeParent)
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

BOOL COleResizeBar::OnEraseBkgnd(CDC*)
{
    return TRUE;    // no erasing necessary
}

void COleResizeBar::OnPaint()
{
    CPaintDC dc(this);

    // always use the same brush origin
    CRect rect;
    GetWindowRect(&rect);
    dc.SetBrushOrg(rect.left & 7, rect.top & 7);

    // draw it
    m_tracker.Draw(&dc);
}

void COleResizeBar::OnSize(UINT /*nType*/, int /*cx*/, int /*cy*/)
{
    GetClientRect(&m_tracker.m_rect);
    int nHandleSize = m_tracker.m_nHandleSize;
    m_tracker.m_rect.InflateRect(-nHandleSize, -nHandleSize);
}

BOOL COleResizeBar::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
    // hit-test the tracker -- we only care about hits on handles
    CPoint point;
    ::GetCursorPos(&point);
    ScreenToClient(&point);
    int hit = m_tracker.HitTest(point);
    if (hit < 0)
        return CControlBar::OnSetCursor(pWnd, nHitTest, message);

    // let the tracker handle setting the cursor
    return m_tracker.SetCursor(pWnd, nHitTest);
}

void COleResizeBar::OnLButtonDown(UINT /*nFlags*/, CPoint point)
{
    // track to parent of the parent
    CWnd* pFrameWnd = GetParentFrame();
    ASSERT_VALID(pFrameWnd);
    CWnd* pParent = pFrameWnd->GetParent();

    pFrameWnd->UpdateWindow();  // update ourselves

    // limit tracking to parent client rectangle
    if (pParent != NULL)
    {
        pParent->UpdateWindow();    // always update before tracking

        // clip cursor to parent window
        CRect rect;
        pParent->GetClientRect(&rect);
        pParent->ClientToScreen(&rect);
        ::ClipCursor(&rect);
    }

    // save the rect, track, then restore
    CRect rectSave = m_tracker.m_rect;
    BOOL bNotify = m_tracker.Track(this, point, FALSE, pParent);
    CRect rectNew = m_tracker.m_rect;
    m_tracker.m_rect = rectSave;

    // allow full mouse movement again
    ::ClipCursor(NULL);

    // notify owner window if tracker changed
    if (bNotify)
    {
        CWnd* pOwner = GetOwner();
        ASSERT_VALID(pOwner);

        // convert relative to parent coordinates
        ClientToScreen(&rectNew);
        pOwner->ScreenToClient(&rectNew);

        // send notification to owner
        pOwner->SendMessage(WM_SIZECHILD, (WPARAM)_AfxGetDlgCtrlID(m_hWnd),
            (LPARAM)(LPCRECT)&rectNew);
    }
}

LRESULT COleResizeBar::OnSizeParent(WPARAM, LPARAM lParam)
{
    AFX_SIZEPARENTPARAMS* lpLayout = (AFX_SIZEPARENTPARAMS*)lParam;

    // only resize the window if doing layout and not just rect query
    if (lpLayout->hDWP != NULL)
        AfxRepositionWindow(lpLayout, m_hWnd, &lpLayout->rect);

    // always adjust the rectangle after the resize
    int nHandleSize = m_tracker.m_nHandleSize;
    ::InflateRect(&lpLayout->rect, -nHandleSize, -nHandleSize);

    return 0;
}

void COleResizeBar::OnUpdateCmdUI(CFrameWnd* /*pTarget*/,
    BOOL /*bDisableIfNoHndler*/)
{
    // just do nothing
}

#ifdef AFX_INIT_SEG
#pragma code_seg(AFX_INIT_SEG)
#endif

IMPLEMENT_DYNAMIC(COleResizeBar, CControlBar)

/////////////////////////////////////////////////////////////////////////////