/*****************************************************************************
Draws "+", "-" and lines that show a tree graphic
*****************************************************************************/
void CGridTreeCellBase::TreeDrawGraphic(CDC* apDC, // current CDC
CRect aRect) // coordinates of bounding cell rectangle
{
ASSERT( apDC != NULL);
ASSERT( m_pTreeColumn != NULL);
ASSERT( m_pTreeColumn->GetAllowDraw());
int iNbrTreeElements = m_pTreeColumn->GetRowCount() - m_pTreeColumn->GetFixedRowCount();
// get current level
unsigned char ucLevelCurrent = GetLevel();
ASSERT( IsViewable() ); // can't deal with hidden rows!
if( ucLevelCurrent <= 0)
{
if( m_pTreeColumn->GetTreeUsesImages())
SetImage( TREE_IMAGE_DOCUMENT);
return; // no + / - box if level 0
}
BOOL bIsNextShowing;
unsigned char ucLevelNext;
int iLineStop;
if( m_pTreeColumn->GetDefTreeIndent() < TREE_BOX_MARGIN * 3)
return; // too small to draw the graphic
CRect RectRel;
TreeGetBoxRelCoords( &RectRel); // returns: relative coordinates
CRect RectBox( RectRel);
RectBox.OffsetRect( aRect.left, aRect.top);
int iXCenter = RectBox.left + ( (RectBox.right - RectBox.left) / 2);
int iYCenter = RectBox.top + ( (RectBox.bottom - RectBox.top) / 2);
CPen psPen(PS_SOLID, 1, m_pTreeColumn->GetTreeLineColor() );
CPen* pOldPen = apDC->SelectObject(&psPen);
TREE_IMAGE TreeImage = TREE_IMAGE_DOCUMENT;
// is it the very last row?
if( !GetForcePlus() && m_iRow >= m_pTreeColumn->GetRowCount() - 1)
{
iXCenter -= m_pTreeColumn->GetDefTreeIndent();
// draw |__ (with long horizontal)
if( TryMoveTo( aRect, apDC, iXCenter, aRect.top) )
if( TryLineTo( aRect, apDC, iXCenter, iYCenter) )
TryLineTo( aRect, apDC, RectBox.right, iYCenter);
apDC->SelectObject(pOldPen);
if( m_pTreeColumn->GetTreeUsesImages())
SetImage( TreeImage);
return;
}
// is it a plus or minus? Check up to all remaining entries for an answer
BOOL bIsPlus;
BOOL bIsMinus;
BOOL bIsLastLeaf;
CGridCtrl* pGrid = GetGrid();
ASSERT( pGrid != NULL);
int iVertLineBottom = aRect.bottom + 1; // if drawing a horizontal line,
// overwrite the grid line in case it is
// not displayed
BOOL bIsBranch = m_pTreeColumn->TreeCellHasPlusMinus(
m_iRow, // row of Cell to check
&bIsPlus, // returns: T=Is a plus
&bIsMinus, // returns: T=Is a minus
&bIsLastLeaf);// returns: T=Is Last Leaf
if( bIsBranch )
{
// returns: T=cell has a plus or minus; F=not
if( bIsPlus)
TreeImage = TREE_IMAGE_FOLDER_CLOSED;
else
TreeImage = TREE_IMAGE_FOLDER_OPEN;
// draw a square box
BOOL bCanDrawRectangle = aRect.PtInRect( CPoint( RectBox.left, RectBox.top ))
&& aRect.PtInRect( CPoint( RectBox.right, RectBox.bottom ));
if( bCanDrawRectangle )
{
apDC->Rectangle( RectBox.left,
RectBox.top,
RectBox.right,
RectBox.bottom);
}
// draw a minus sign
if( TryMoveTo( aRect, apDC, RectBox.left + TREE_BOX_MARGIN, iYCenter) )
TryLineTo( aRect, apDC, RectBox.right - TREE_BOX_MARGIN, iYCenter);
// draw small horizontal tick just to the left of the box if not
// level 1
if( ucLevelCurrent > 1)
{
// draw -
if( TryMoveTo( aRect, apDC, iXCenter - m_pTreeColumn->GetDefTreeIndent(), iYCenter) )
TryLineTo( aRect, apDC, RectBox.left, iYCenter);
}
if( bIsPlus)
{
// ... make it into a plus sign
if( TryMoveTo( aRect, apDC, iXCenter, RectBox.top + TREE_BOX_MARGIN) )
TryLineTo( aRect, apDC, iXCenter, RectBox.bottom - TREE_BOX_MARGIN);
}
else
{
// it's a minus sign, so draw vertical tick below box center
// draw |
if( TryMoveTo( aRect, apDC, iXCenter, RectBox.bottom) )
TryLineTo( aRect, apDC, iXCenter, iVertLineBottom);
}
}
else if( ucLevelCurrent > 1)
{
// it's not a box, it's a leaf of the tree. Just draw a horizontal line
CGridTreeCellBase* pGridTreeCellBase = (CGridTreeCellBase*)pGrid->GetCell( m_iRow + 1, m_pTreeColumn->GetColumnWithTree());
if( pGridTreeCellBase == NULL)
return;
bIsNextShowing = pGridTreeCellBase->IsViewable();
ucLevelNext = pGridTreeCellBase->GetLevel();
if( ucLevelCurrent > ucLevelNext)
{
bIsLastLeaf = TRUE;
}
// draw -
if( TryMoveTo( aRect, apDC, iXCenter - m_pTreeColumn->GetDefTreeIndent(), iYCenter) )
TryLineTo( aRect, apDC, iXCenter, iYCenter);
}
// draw nearest to text vertical lines that appear to the left of the box for all
// levels except level 1
if( ucLevelCurrent > 1)
{
iXCenter -= m_pTreeColumn->GetDefTreeIndent();
if( bIsLastLeaf)
iLineStop = iYCenter;
else
iLineStop = iVertLineBottom;
// draw |
if( TryMoveTo( aRect, apDC, iXCenter, aRect.top) )
TryLineTo( aRect, apDC, iXCenter, iLineStop);
}
BOOL bFoundBranch;
unsigned char ucLevelToCheck = ucLevelCurrent;
// draw vertical lines that appear to the left of the box for all appropriate
// levels except level 1
for( int i1=ucLevelCurrent - 1; i1 > 1; i1--)
{
bFoundBranch = FALSE;
int iStartPt = m_iRow + 1;
for( int i2=iStartPt; i2 <= iNbrTreeElements; i2++)
{
CGridTreeCellBase* pGridTreeCellBase = (CGridTreeCellBase*)pGrid->GetCell(
i2,
m_pTreeColumn->GetColumnWithTree());
if( pGridTreeCellBase == NULL)
return;
ucLevelNext = pGridTreeCellBase->GetLevel();
if( ucLevelNext + 1 < ucLevelToCheck)
break;
if( ucLevelNext + 1 == ucLevelToCheck)
{
bIsNextShowing = pGridTreeCellBase->IsViewable();
if( bIsNextShowing)
bFoundBranch = TRUE;
break;
}
}
iXCenter -= m_pTreeColumn->GetDefTreeIndent();
if( bFoundBranch)
{
// draw |
if( TryMoveTo( aRect, apDC, iXCenter, aRect.top) )
TryLineTo( aRect, apDC, iXCenter, iVertLineBottom);
}
ucLevelToCheck--; // each loop heads to level 1
}
// cleanup
apDC->SelectObject(pOldPen);
if( m_pTreeColumn->GetTreeUsesImages())
SetImage( TreeImage);
}
