NS_IMETHODIMP
nsDeckFrame::DoLayout(nsBoxLayoutState& aState)
{
// Make sure we tweak the state so it does not resize our children.
// We will do that.
uint32_t oldFlags = aState.LayoutFlags();
aState.SetLayoutFlags(NS_FRAME_NO_SIZE_VIEW | NS_FRAME_NO_VISIBILITY);
// do a normal layout
nsresult rv = nsBoxFrame::DoLayout(aState);
// run though each child. Hide all but the selected one
nsIFrame* box = nsBox::GetChildBox(this);
nscoord count = 0;
while (box)
{
// make collapsed children not show up
if (count != mIndex)
HideBox(box);
box = GetNextBox(box);
count++;
}
aState.SetLayoutFlags(oldFlags);
return rv;
}
/**
* This is redefined because row groups have a funny property. If they are flexible
* then their flex must be equal to the sum of their children's flexes.
*/
nscoord
nsGridRowGroupFrame::GetFlex(nsBoxLayoutState& aState)
{
// if we are flexible out flexibility is determined by our columns.
// so first get the our flex. If not 0 then our flex is the sum of
// our columns flexes.
if (!DoesNeedRecalc(mFlex))
return mFlex;
if (nsBoxFrame::GetFlex(aState) == 0)
return 0;
// ok we are flexible add up our children
nscoord totalFlex = 0;
nsIFrame* child = nsBox::GetChildBox(this);
while (child)
{
totalFlex += child->GetFlex(aState);
child = GetNextBox(child);
}
mFlex = totalFlex;
return totalFlex;
}
void
nsSprocketLayout::PopulateBoxSizes(nsIFrame* aBox, nsBoxLayoutState& aState, nsBoxSize*& aBoxSizes, nscoord& aMinSize, nscoord& aMaxSize, int32_t& aFlexes)
{
// used for the equal size flag
nscoord biggestPrefWidth = 0;
nscoord biggestMinWidth = 0;
nscoord smallestMaxWidth = NS_INTRINSICSIZE;
nsFrameState frameState = nsFrameState(0);
GetFrameState(aBox, frameState);
//if (frameState & NS_STATE_CURRENTLY_IN_DEBUG)
// printf("In debug\n");
aMinSize = 0;
aMaxSize = NS_INTRINSICSIZE;
bool isHorizontal;
if (IsHorizontal(aBox))
isHorizontal = true;
else
isHorizontal = false;
// this is a nice little optimization
// it turns out that if we only have 1 flexable child
// then it does not matter what its preferred size is
// there is nothing to flex it relative. This is great
// because we can avoid asking for a preferred size in this
// case. Why is this good? Well you might have html inside it
// and asking html for its preferred size is rather expensive.
// so we can just optimize it out this way.
// set flexes
nsIFrame* child = nsBox::GetChildBox(aBox);
aFlexes = 0;
nsBoxSize* currentBox = nullptr;
#if 0
nsBoxSize* start = aBoxSizes;
while(child)
{
// ok if we started with a list move down the list
// until we reach the end. Then start looking at childen.
// This feature is used extensively for Grid.
nscoord flex = 0;
if (!start) {
if (!currentBox) {
aBoxSizes = new (aState) nsBoxSize();
currentBox = aBoxSizes;
} else {
currentBox->next = new (aState) nsBoxSize();
currentBox = currentBox->next;
}
flex = child->GetFlex(aState);
currentBox->flex = flex;
currentBox->collapsed = child->IsCollapsed();
} else {
flex = start->flex;
start = start->next;
}
if (flex > 0)
aFlexes++;
child = GetNextBox(child);
}
#endif
// get pref, min, max
child = nsBox::GetChildBox(aBox);
currentBox = aBoxSizes;
nsBoxSize* last = nullptr;
nscoord maxFlex = 0;
int32_t childCount = 0;
while(child)
{
while (currentBox && currentBox->bogus) {
last = currentBox;
currentBox = currentBox->next;
}
++childCount;
nsSize pref(0,0);
nsSize minSize(0,0);
nsSize maxSize(NS_INTRINSICSIZE,NS_INTRINSICSIZE);
nscoord ascent = 0;
bool collapsed = child->IsCollapsed();
if (!collapsed) {
// only one flexible child? Cool we will just make its preferred size
// 0 then and not even have to ask for it.
//if (flexes != 1) {
pref = child->GetPrefSize(aState);
minSize = child->GetMinSize(aState);
maxSize = nsBox::BoundsCheckMinMax(minSize, child->GetMaxSize(aState));
ascent = child->GetBoxAscent(aState);
nsMargin margin;
child->GetMargin(margin);
ascent += margin.top;
//}
pref = nsBox::BoundsCheck(minSize, pref, maxSize);
AddMargin(child, pref);
AddMargin(child, minSize);
AddMargin(child, maxSize);
}
if (!currentBox) {
// create one.
currentBox = new (aState) nsBoxSize();
if (!aBoxSizes) {
aBoxSizes = currentBox;
last = aBoxSizes;
} else {
last->next = currentBox;
last = currentBox;
}
nscoord minWidth;
nscoord maxWidth;
nscoord prefWidth;
// get sizes from child
if (isHorizontal) {
minWidth = minSize.width;
maxWidth = maxSize.width;
prefWidth = pref.width;
} else {
minWidth = minSize.height;
maxWidth = maxSize.height;
prefWidth = pref.height;
}
nscoord flex = child->GetFlex(aState);
// set them if you collapsed you are not flexible.
if (collapsed) {
currentBox->flex = 0;
}
else {
if (flex > maxFlex) {
maxFlex = flex;
}
currentBox->flex = flex;
}
// we specified all our children are equal size;
if (frameState & NS_STATE_EQUAL_SIZE) {
if (prefWidth > biggestPrefWidth)
biggestPrefWidth = prefWidth;
if (minWidth > biggestMinWidth)
biggestMinWidth = minWidth;
if (maxWidth < smallestMaxWidth)
smallestMaxWidth = maxWidth;
} else { // not we can set our children right now.
currentBox->pref = prefWidth;
currentBox->min = minWidth;
currentBox->max = maxWidth;
}
NS_ASSERTION(minWidth <= prefWidth && prefWidth <= maxWidth,"Bad min, pref, max widths!");
}
if (!isHorizontal) {
if (minSize.width > aMinSize)
aMinSize = minSize.width;
if (maxSize.width < aMaxSize)
aMaxSize = maxSize.width;
} else {
if (minSize.height > aMinSize)
aMinSize = minSize.height;
if (maxSize.height < aMaxSize)
aMaxSize = maxSize.height;
}
currentBox->collapsed = collapsed;
aFlexes += currentBox->flex;
child = nsBox::GetNextBox(child);
last = currentBox;
currentBox = currentBox->next;
}
if (childCount > 0) {
nscoord maxAllowedFlex = nscoord_MAX / childCount;
if (MOZ_UNLIKELY(maxFlex > maxAllowedFlex)) {
// clamp all the flexes
currentBox = aBoxSizes;
while (currentBox) {
currentBox->flex = std::min(currentBox->flex, maxAllowedFlex);
currentBox = currentBox->next;
}
}
}
#ifdef DEBUG
else {
NS_ASSERTION(maxFlex == 0, "How did that happen?");
}
#endif
// we specified all our children are equal size;
if (frameState & NS_STATE_EQUAL_SIZE) {
smallestMaxWidth = std::max(smallestMaxWidth, biggestMinWidth);
biggestPrefWidth = nsBox::BoundsCheck(biggestMinWidth, biggestPrefWidth, smallestMaxWidth);
currentBox = aBoxSizes;
while(currentBox)
{
if (!currentBox->collapsed) {
currentBox->pref = biggestPrefWidth;
currentBox->min = biggestMinWidth;
currentBox->max = smallestMaxWidth;
} else {
currentBox->pref = 0;
currentBox->min = 0;
currentBox->max = 0;
}
currentBox = currentBox->next;
}
}
}
