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LTableMultiSelector::DragSelect()改良版
Subject: SUG -- LTableMultiSelector::DragSelect()
 
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METROWERKS PRODUCT AND USAGE SECTION
 
Product name :            [ CodeWarrior Gold ]
Product version :         [ CW12 ]
Component name :          [ PowerPlant ]
Generating:               [ Mac OS 68K / Mac OS PowerPC ]
Purpose:                  [ application ]
 
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SUGGESTION
 
Here is an LTableMultiSelector::DragSelect() code with better hilite 
redrawing.
 
static  void    RedrawHilite(LTableView *tableView,RgnHandle rh,bool hilite)
{
    if ( !::EmptyRgn(rh) ) {
        const Rect  r = (**rh).rgnBBox;
        for ( TableIndexT row = r.top; row < r.bottom; row++ ) {
            for ( TableIndexT col = r.left; col < r.right; col++ ) {
                Point   pt;
                pt.v = row;
                pt.h = col;
                if ( ::PtInRgn(pt,rh) ) {
                    STableCell  redrawCell(row,col);
                    tableView->HiliteCell(redrawCell,hilite);
                }
            }
        }
    }
}
 
Boolean
LTableMultiSelector::DragSelect(
    const STableCell        &inCell,
    const SMouseDownEvent   &inMouseDown)
{
    Boolean     inSameCell = true;
 
    ClickSelect(inCell, inMouseDown);   // First handle as a normal click
    
    if (inMouseDown.macEvent.modifiers & cmdKey) {
            
            // I really have no good idea what to do when the
            // command key is down. Should it toggle the selection
            // of the cells dragged over? Should it set a mode
            // based on the state of the cell originally clicked,
            // and then continue selecting or deselecting the cells
            // dragged over?
            
            // For the moment, do the simple thing and not support
            // drag select when the command key is down.
            
        return true;
    }
    
    STableCell  currCell = inCell;
    StRegion        oldSel;
    StRegion        addSel;
    StRegion        delSel;
    
    while (::StillDown()) {
        STableCell  hitCell;
        SPoint32    imageLoc;
        Point       mouseLoc;
        mTableView->FocusDraw();
        ::GetMouse(&mouseLoc);
        if (mTableView->AutoScrollImage(mouseLoc)) {
            mTableView->FocusDraw();
            Rect    frame;
            mTableView->CalcLocalFrameRect(frame);
            Int32 pt = ::PinRect(&frame, mouseLoc);
            mouseLoc = *(Point*)&pt;
        }
        mTableView->LocalToImagePoint(mouseLoc, imageLoc);
        mTableView->GetCellHitBy(imageLoc, hitCell);
        
        if (currCell != hitCell) {
            inSameCell = false;
    
            if (mTableView->IsValidCell(hitCell)) {
            
                // Right now, all cells between the Anchor cell and
                // Curr cell are selected. New selection will be
                // all cells between the Anchor and the Hit cell.
                
                ::CopyRgn(mSelectionRgn,oldSel);
 
                TableIndexT     left, top, right, bottom;
                if (mAnchorCell.col < hitCell.col) {
                    left  = mAnchorCell.col;
                    right = hitCell.col + 1;
                }else{
                    left  = hitCell.col;
                    right = mAnchorCell.col + 1;
                }
                if (mAnchorCell.row < hitCell.row) {
                    top    = mAnchorCell.row;
                    bottom = hitCell.row + 1;
                }else{
                    top    = hitCell.row;
                    bottom = mAnchorCell.row + 1;
                }
                ::SetRectRgn(mSelectionRgn,left,top,right,bottom);
 
                ::DiffRgn(oldSel,mSelectionRgn,delSel); // delSel = oldSel - mSelectionRgn
                ::DiffRgn(mSelectionRgn,oldSel,addSel); // addSel = mSelectionRgn - oldSel
                
                RedrawHilite(mTableView,delSel,false);
                RedrawHilite(mTableView,addSel,true);
                
                currCell = hitCell;
            }
        }
    }
    
    return inSameCell;
}

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