//nWidth,nHeight == -1:wrap_content
CSize SLinearLayout::MeasureChildren(SWindow * pParent,int nWidth,int nHeight) const
{
CSize *pSize = new CSize [pParent->GetChildrenCount()];
ILayoutParam * pParentLayoutParam = pParent->GetLayoutParam();
int iChild = 0;
SWindow *pChild = pParent->GetNextLayoutChild(NULL);
while(pChild)
{
SLinearLayoutParam *pLinearLayoutParam = pChild->GetLayoutParamT<SLinearLayoutParam>();
int nScale = pChild->GetScale();
CSize szChild(SIZE_WRAP_CONTENT,SIZE_WRAP_CONTENT);
if(pLinearLayoutParam->IsMatchParent(Horz))
{
if(!pParentLayoutParam->IsWrapContent(Horz))
szChild.cx = nWidth;
}
else if(pLinearLayoutParam->IsSpecifiedSize(Horz))
{
szChild.cx = pLinearLayoutParam->GetSpecifiedSize(Horz).toPixelSize(nScale);
szChild.cx += pLinearLayoutParam->extend_left.toPixelSize(nScale) + pLinearLayoutParam->extend_right.toPixelSize(nScale);
}
if(pLinearLayoutParam->IsMatchParent(Vert))
{
if(!pParentLayoutParam->IsWrapContent(Vert))
szChild.cy = nHeight;
}
else if(pLinearLayoutParam->IsSpecifiedSize(Vert))
{
szChild.cy = pLinearLayoutParam->GetSpecifiedSize(Vert).toPixelSize(nScale);
szChild.cy += pLinearLayoutParam->extend_top.toPixelSize(nScale) + pLinearLayoutParam->extend_bottom.toPixelSize(nScale);
}
if(szChild.cx == SIZE_WRAP_CONTENT || szChild.cy == SIZE_WRAP_CONTENT)
{
int nWid = szChild.cx, nHei = szChild.cy;
if(nWid == SIZE_WRAP_CONTENT)
nWid = nWidth * pParentLayoutParam->IsWrapContent(Horz)?-1:1; //把父窗口的WrapContent属性通过-1标志传递给GetDesiredSize
if(nHei == SIZE_WRAP_CONTENT)
nHei = nHeight * pParentLayoutParam->IsWrapContent(Vert)?-1:1;//把父窗口的WrapContent属性通过-1标志传递给GetDesiredSize
CSize szCalc = pChild->GetDesiredSize(nWid,nHei);
if(szChild.cx == SIZE_WRAP_CONTENT)
{
szChild.cx = szCalc.cx;
szChild.cx += pLinearLayoutParam->extend_left.toPixelSize(nScale) + pLinearLayoutParam->extend_right.toPixelSize(nScale);
}
if(szChild.cy == SIZE_WRAP_CONTENT)
{
szChild.cy = szCalc.cy;
szChild.cy += pLinearLayoutParam->extend_top.toPixelSize(nScale) + pLinearLayoutParam->extend_bottom.toPixelSize(nScale);
}
}
pSize [iChild++] = szChild;
pChild = pParent->GetNextLayoutChild(pChild);
}
CSize szRet;
for(int i=0;i<iChild;i++)
{
if(m_orientation == Horz)
{
szRet.cx += pSize[i].cx;
szRet.cy = (std::max)(szRet.cy,pSize[i].cy);
}else
{
szRet.cx = (std::max)(szRet.cx,pSize[i].cx);
szRet.cy += pSize[i].cy;
}
}
delete []pSize;
return szRet;
}
void SLinearLayout::LayoutChildren(SWindow * pParent)
{
CRect rcParent = pParent->GetChildrenLayoutRect();
CSize *pSize = new CSize [pParent->GetChildrenCount()];
SWindow ** pChilds = new SWindow * [pParent->GetChildrenCount()];
int nChilds = 0;
int offset = 0;
float fWeight= 0.0f;
{//assign width or height
int iChild = 0;
SWindow *pChild=pParent->GetNextLayoutChild(NULL);
while(pChild)
{
SLinearLayoutParam *pLinearLayoutParam = pChild->GetLayoutParamT<SLinearLayoutParam>();
int nScale = pChild->GetScale();
CSize szChild(SIZE_WRAP_CONTENT,SIZE_WRAP_CONTENT);
if(pLinearLayoutParam->IsMatchParent(Horz))
szChild.cx = rcParent.Width();
else if(pLinearLayoutParam->IsSpecifiedSize(Horz))
{
szChild.cx = pLinearLayoutParam->GetSpecifiedSize(Horz).toPixelSize(nScale);
szChild.cx += pLinearLayoutParam->extend_left.toPixelSize(nScale) + pLinearLayoutParam->extend_right.toPixelSize(nScale);
}
if(pLinearLayoutParam->IsMatchParent(Vert))
szChild.cy = rcParent.Height();
else if(pLinearLayoutParam->IsSpecifiedSize(Vert))
{
szChild.cy = pLinearLayoutParam->GetSpecifiedSize(Vert).toPixelSize(nScale);
szChild.cy += pLinearLayoutParam->extend_top.toPixelSize(nScale) + pLinearLayoutParam->extend_bottom.toPixelSize(nScale);
}
if(pLinearLayoutParam->weight > 0.0f)
{
fWeight += pLinearLayoutParam->weight;
}
if(szChild.cx == SIZE_WRAP_CONTENT || szChild.cy == SIZE_WRAP_CONTENT)
{
CSize szCalc = pChild->GetDesiredSize(szChild.cx,szChild.cy);
if(szChild.cx == SIZE_WRAP_CONTENT)
{
szChild.cx = szCalc.cx;
szChild.cx += pLinearLayoutParam->extend_left.toPixelSize(nScale) + pLinearLayoutParam->extend_right.toPixelSize(nScale);
}
if(szChild.cy == SIZE_WRAP_CONTENT)
{
szChild.cy = szCalc.cy;
szChild.cy += pLinearLayoutParam->extend_top.toPixelSize(nScale) + pLinearLayoutParam->extend_bottom.toPixelSize(nScale);
}
}
pChilds[iChild] = pChild;
pSize [iChild] = szChild;
offset += m_orientation == Vert ? szChild.cy:szChild.cx;
iChild++;
pChild=pParent->GetNextLayoutChild(pChild);
}
nChilds = iChild;
}
int size = m_orientation == Vert? rcParent.Height():rcParent.Width();
if(fWeight > 0.0f && size > offset)
{//assign size by weight
int nRemain = size - offset;
for(int iChild = 0;iChild < nChilds;iChild ++)
{
SWindow *pChild = pChilds[iChild];
SLinearLayoutParam *pLinearLayoutParam = pChild->GetLayoutParamT<SLinearLayoutParam>();
if(pLinearLayoutParam->weight > 0.0f)
{
LONG & szChild = m_orientation == Vert? pSize[iChild].cy:pSize[iChild].cx;
szChild += (int)(nRemain*pLinearLayoutParam->weight/fWeight);
}
}
}
{//assign position
offset = 0;
for(int iChild = 0;iChild < nChilds;iChild ++)
{
SWindow *pChild = pChilds[iChild];
SLinearLayoutParam *pLinearLayoutParam = pChild->GetLayoutParamT<SLinearLayoutParam>();
int nScale = pChild->GetScale();
Gravity gravity = pLinearLayoutParam->gravity == G_Undefined? m_gravity:pLinearLayoutParam->gravity;
if(gravity == G_Undefined) gravity = G_Left;
if(m_orientation == Vert)
{
CRect rcChild(CPoint(0,offset),pSize[iChild]);
rcChild.OffsetRect(rcParent.TopLeft());
if(gravity == G_Center)
rcChild.OffsetRect((rcParent.Width()-rcChild.Width())/2,0);
else if(gravity == G_Right)
rcChild.OffsetRect(rcParent.Width()-rcChild.Width(),0);
CRect rcChild2 = rcChild;
rcChild2.DeflateRect(pLinearLayoutParam->extend_left.toPixelSize(nScale),
pLinearLayoutParam->extend_top.toPixelSize(nScale),
pLinearLayoutParam->extend_right.toPixelSize(nScale),
pLinearLayoutParam->extend_bottom.toPixelSize(nScale)
);
pChild->OnRelayout(rcChild2);
offset += rcChild.Height();
}else
{
CRect rcChild(CPoint(offset,0),pSize[iChild]);
rcChild.OffsetRect(rcParent.TopLeft());
if(gravity == G_Center)
rcChild.OffsetRect(0,(rcParent.Height()-rcChild.Height())/2);
else if(gravity == G_Right)
rcChild.OffsetRect(0,rcParent.Height()-rcChild.Height());
CRect rcChild2 = rcChild;
rcChild2.DeflateRect(pLinearLayoutParam->extend_left.toPixelSize(nScale),
pLinearLayoutParam->extend_top.toPixelSize(nScale),
pLinearLayoutParam->extend_right.toPixelSize(nScale),
pLinearLayoutParam->extend_bottom.toPixelSize(nScale));
pChild->OnRelayout(rcChild2);
offset += rcChild.Width();
}
}
}
delete []pChilds;
delete []pSize;
}
