DRAGDROP.CPP

/* 
 * DRAGDROP.CPP 
 * Patron Chapter 17 
 * 
 * Member functions of the CPages class concerned with drag-drop 
 * and other object-placement functionality.  Moved here to clean 
 * up CPAGES.CPP somewhat. 
 * 
 * Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved 
 * 
 * Kraig Brockschmidt, Microsoft 
 * Internet  :  kraigb@microsoft.com 
 * Compuserve:  >INTERNET:kraigb@microsoft.com 
 */ 
 
 
#include "patron.h" 
 
 
/* 
 * CPages::UTestDroppablePoint 
 * 
 * Purpose: 
 *  Returns if the point in pptl is on the paper in the current page 
 *  and alternately if it's within horizontal or vertical inset 
 *  regions. 
 * 
 * Parameters: 
 *  pptl            PPOINTL containing the point in screen 
 *                  coordinates. 
 * 
 * Return Value: 
 *  UINT            A UDROP_* value. 
 */ 
 
UINT CPages::UTestDroppablePoint(PPOINTL pptl) 
    { 
    POINT       pt; 
    RECT        rc, rcT, rcC; 
    UINT        uRet; 
 
    POINTFROMPOINTL(pt, *pptl); 
    ScreenToClient(m_hWnd, &pt); 
 
    CalcBoundingRect(&rc, FALSE); 
 
    GetClientRect(m_hWnd, &rcC); 
    IntersectRect(&rcT, &rc, &rcC); 
 
    //Check for at least a client area hit. 
    if (!PtInRect(&rcT, pt)) 
        return UDROP_NONE; 
 
    uRet=UDROP_CLIENT; 
 
    //Scroll checks happen on client area, not document area 
    if (PtInRect(&rcC, pt)) 
        { 
        //Check horizontal inset 
        if (pt.x <= rcC.left+(int)m_uScrollInset) 
            uRet |= UDROP_INSETLEFT; 
        else if (pt.x >= rcC.right-(int)m_uScrollInset) 
            uRet |= UDROP_INSETRIGHT; 
 
        //Check vertical inset 
        if (pt.y <= rcC.top+(int)m_uScrollInset) 
            uRet |= UDROP_INSETTOP; 
        else if (pt.y >= rcC.bottom-(int)m_uScrollInset) 
            uRet |= UDROP_INSETBOTTOM; 
        } 
 
    return uRet; 
    } 
 
 
 
 
/* 
 * CPages::DrawDropTargetRect 
 * 
 * Purpose: 
 *  Draws a dotted rectangle on the Pages window to show where 
 *  a drop might occur.  This is a toggle function. 
 * 
 * Parameters: 
 *  pptl            PPOINTL containing the upper-left point 
 *                  in screen coordinates. 
 *  pszl            LPSIZEL containing the rect extents in device 
 *                  units. 
 * 
 * Return Value: 
 *  None 
 */ 
 
void CPages::DrawDropTargetRect(PPOINTL pptl, LPSIZEL pszl) 
    { 
    POINT           pt; 
    RECT            rc, rcT; 
    HDC             hDC; 
 
    if (NULL==pptl && NULL==pszl) 
        { 
        /* 
         * This case is used from WM_PAINT in pagewin.cpp so we can 
         * control the proper visibility of the drag rectangle when 
         * we're scrolling.  If drag-drop happens between two apps, 
         * then any ScrollWindow will cause a WM_PAINT after we 
         * leave DragOver, so that paint would normally overwrite 
         * the last drawn rectangle.  To alleviate that, WM_PAINT 
         * will remove the last rect by sending us NULLs, paint, 
         * then reinstate the rectangle. 
         */ 
        pptl=&m_ptlRect; 
        pszl=&m_szlRect; 
        } 
    else 
        { 
        m_ptlRect.x=pptl->x; 
        m_ptlRect.y=pptl->y; 
        m_szlRect.cx=pszl->cx; 
        m_szlRect.cy=pszl->cy; 
 
        //Flag is only affected from IDropTarget, not WM_PAINT calls 
        m_fDragRectShown=!m_fDragRectShown; 
        } 
 
    POINTFROMPOINTL(pt, *pptl); 
    ScreenToClient(m_hWnd, &pt); 
    SetRect(&rc, pt.x, pt.y, pt.x+(int)pszl->cx 
        , pt.y+(int)pszl->cy); 
 
    CalcBoundingRect(&rcT, FALSE); 
    IntersectRect(&rc, &rc, &rcT); 
 
    if (!IsRectEmpty(&rc)) 
        { 
        hDC=GetDC(m_hWnd); 
        DrawFocusRect(hDC, &rc); 
        ReleaseDC(m_hWnd, hDC); 
        } 
 
    return; 
    } 
 
 
 
 
/* 
 * CPages::AdjustPosition 
 * 
 * Purpose: 
 *  Adjusts a point for the scrolling offset and then converts it 
 *  and a size from device into LOMETRIC units. 
 * 
 * Parameters: 
 *  pptl            PPOINTL to adjust and convert 
 *  pszl            LPSIZEL to convert 
 * 
 * Return Value: 
 *  None 
 */ 
 
void CPages::AdjustPosition(PPOINTL pptl, LPSIZEL pszl) 
    { 
    RECT        rc; 
 
    SetRect(&rc, m_xPos+(int)pptl->x 
        , m_yPos+(int)pptl->y, (int)pszl->cx, (int)pszl->cy); 
 
    RectConvertMappings(&rc, NULL, FALSE); 
 
    pptl->x=rc.left; 
    pptl->y=rc.top; 
 
    pszl->cx=rc.right; 
    pszl->cy=rc.bottom; 
 
    return; 
    }