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gecko/layout/xul/base/src/nsSprocketLayout.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* David Hyatt <hyatt@netscape.com>
* Pierre Phaneuf <pp@ludusdesign.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
//
// Eric Vaughan
// Netscape Communications
//
// See documentation in associated header file
//
#include "nsBoxLayoutState.h"
#include "nsSprocketLayout.h"
#include "nsPresContext.h"
#include "nsCOMPtr.h"
#include "nsIContent.h"
#include "nsIPresShell.h"
#include "nsHTMLContainerFrame.h"
#include "nsBoxFrame.h"
#include "nsBoxFrame.h"
nsIBoxLayout* nsSprocketLayout::gInstance = nsnull;
//#define DEBUG_GROW
#define DEBUG_SPRING_SIZE 8
#define DEBUG_BORDER_SIZE 2
#define COIL_SIZE 8
nsresult
NS_NewSprocketLayout( nsIPresShell* aPresShell, nsCOMPtr<nsIBoxLayout>& aNewLayout)
{
if (!nsSprocketLayout::gInstance) {
nsSprocketLayout::gInstance = new nsSprocketLayout();
NS_IF_ADDREF(nsSprocketLayout::gInstance);
}
// we have not instance variables so just return our static one.
aNewLayout = nsSprocketLayout::gInstance;
return NS_OK;
}
/*static*/ void
nsSprocketLayout::Shutdown()
{
NS_IF_RELEASE(gInstance);
}
nsSprocketLayout::nsSprocketLayout()
{
}
PRBool
nsSprocketLayout::IsHorizontal(nsIBox* aBox)
{
return (aBox->GetStateBits() & NS_STATE_IS_HORIZONTAL) != 0;
}
void
nsSprocketLayout::GetFrameState(nsIBox* aBox, nsFrameState& aState)
{
aState = aBox->GetStateBits();
}
static PRUint8
GetFrameDirection(nsIBox* aBox)
{
return aBox->GetStyleVisibility()->mDirection;
}
static void
HandleBoxPack(nsIBox* aBox, const nsFrameState& aFrameState, nscoord& aX, nscoord& aY,
const nsRect& aOriginalRect, const nsRect& aClientRect)
{
// In the normal direction we lay out our kids in the positive direction (e.g., |x| will get
// bigger for a horizontal box, and |y| will get bigger for a vertical box). In the reverse
// direction, the opposite is true. We'll be laying out each child at a smaller |x| or
// |y|.
PRUint8 frameDirection = GetFrameDirection(aBox);
if (aFrameState & NS_STATE_IS_HORIZONTAL) {
if (aFrameState & NS_STATE_IS_DIRECTION_NORMAL) {
// The normal direction. |x| increases as we move through our children.
aX = aClientRect.x;
}
else {
// The reverse direction. |x| decreases as we move through our children.
aX = aClientRect.x + aOriginalRect.width;
}
// |y| is always in the normal direction in horizontal boxes
aY = aClientRect.y;
}
else {
// take direction property into account for |x| in vertical boxes
if (frameDirection == NS_STYLE_DIRECTION_LTR) {
// The normal direction. |x| increases as we move through our children.
aX = aClientRect.x;
}
else {
// The reverse direction. |x| decreases as we move through our children.
aX = aClientRect.x + aOriginalRect.width;
}
if (aFrameState & NS_STATE_IS_DIRECTION_NORMAL) {
// The normal direction. |y| increases as we move through our children.
aY = aClientRect.y;
}
else {
// The reverse direction. |y| decreases as we move through our children.
aY = aClientRect.y + aOriginalRect.height;
}
}
// Get our pack/alignment information.
nsIBox::Halignment halign = aBox->GetHAlign();
nsIBox::Valignment valign = aBox->GetVAlign();
// The following code handles box PACKING. Packing comes into play in the case where the computed size for
// all of our children (now stored in our client rect) is smaller than the size available for
// the box (stored in |aOriginalRect|).
//
// Here we adjust our |x| and |y| variables accordingly so that we start at the beginning,
// middle, or end of the box.
//
// XXXdwh JUSTIFY needs to be implemented!
if (aFrameState & NS_STATE_IS_HORIZONTAL) {
switch(halign) {
case nsBoxFrame::hAlign_Left:
break; // Nothing to do. The default initialized us properly.
case nsBoxFrame::hAlign_Center:
if (aFrameState & NS_STATE_IS_DIRECTION_NORMAL)
aX += (aOriginalRect.width - aClientRect.width)/2;
else
aX -= (aOriginalRect.width - aClientRect.width)/2;
break;
case nsBoxFrame::hAlign_Right:
if (aFrameState & NS_STATE_IS_DIRECTION_NORMAL)
aX += (aOriginalRect.width - aClientRect.width);
else
aX -= (aOriginalRect.width - aClientRect.width);
break; // Nothing to do for the reverse dir. The default initialized us properly.
}
} else {
switch(valign) {
case nsBoxFrame::vAlign_Top:
case nsBoxFrame::vAlign_BaseLine: // This value is technically impossible to specify for pack.
break; // Don't do anything. We were initialized correctly.
case nsBoxFrame::vAlign_Middle:
if (aFrameState & NS_STATE_IS_DIRECTION_NORMAL)
aY += (aOriginalRect.height - aClientRect.height)/2;
else
aY -= (aOriginalRect.height - aClientRect.height)/2;
break;
case nsBoxFrame::vAlign_Bottom:
if (aFrameState & NS_STATE_IS_DIRECTION_NORMAL)
aY += (aOriginalRect.height - aClientRect.height);
else
aY -= (aOriginalRect.height - aClientRect.height);
break;
}
}
}
NS_IMETHODIMP
nsSprocketLayout::Layout(nsIBox* aBox, nsBoxLayoutState& aState)
{
// See if we are collapsed. If we are, then simply iterate over all our
// children and give them a rect of 0 width and height.
if (aBox->IsCollapsed(aState)) {
nsIBox* child = aBox->GetChildBox();
while(child)
{
nsBoxFrame::LayoutChildAt(aState, child, nsRect(0,0,0,0));
child = child->GetNextBox();
}
return NS_OK;
}
aState.PushStackMemory();
// ----- figure out our size ----------
nsSize originalSize = aBox->GetSize();
// -- make sure we remove our border and padding ----
nsRect clientRect;
aBox->GetClientRect(clientRect);
// |originalClientRect| represents the rect of the entire box (excluding borders
// and padding). We store it here because we're going to use |clientRect| to hold
// the required size for all our kids. As an example, consider an hbox with a
// specified width of 300. If the kids total only 150 pixels of width, then
// we have 150 pixels left over. |clientRect| is going to hold a width of 150 and
// is going to be adjusted based off the value of the PACK property. If flexible
// objects are in the box, then the two rects will match.
// XXX this should really be called "frameBounds" or something, and we
// really only need the size
nsRect originalClientRect(clientRect);
// The frame state contains cached knowledge about our box, such as our orientation
// and direction.
nsFrameState frameState = 0;
GetFrameState(aBox, frameState);
// Build a list of our children's desired sizes and computed sizes
nsBoxSize* boxSizes = nsnull;
nsComputedBoxSize* computedBoxSizes = nsnull;
nscoord maxAscent = aBox->GetBoxAscent(aState);
nscoord min = 0;
nscoord max = 0;
PRInt32 flexes = 0;
PopulateBoxSizes(aBox, aState, boxSizes, computedBoxSizes, min, max, flexes);
// The |size| variable will hold the total size of children along the axis of
// the box. Continuing with the example begun in the comment above, size would
// be 150 pixels.
nscoord size = clientRect.width;
if (!IsHorizontal(aBox))
size = clientRect.height;
ComputeChildSizes(aBox, aState, size, boxSizes, computedBoxSizes);
// After the call to ComputeChildSizes, the |size| variable contains the
// total required size of all the children. We adjust our clientRect in the
// appropriate dimension to match this size. In our example, we now assign
// 150 pixels into the clientRect.width.
//
// The variables |min| and |max| hold the minimum required size box must be
// in the OPPOSITE orientation, e.g., for a horizontal box, |min| is the minimum
// height we require to enclose our children, and |max| is the maximum height
// required to enclose our children.
if (IsHorizontal(aBox)) {
clientRect.width = size;
if (clientRect.height < min)
clientRect.height = min;
if (frameState & NS_STATE_AUTO_STRETCH) {
if (clientRect.height > max)
clientRect.height = max;
}
} else {
clientRect.height = size;
if (clientRect.width < min)
clientRect.width = min;
if (frameState & NS_STATE_AUTO_STRETCH) {
if (clientRect.width > max)
clientRect.width = max;
}
}
// Grow the frame size now if necessary
NS_ASSERTION(clientRect.TopLeft() == originalClientRect.TopLeft(),
"clientRect moved??");
originalClientRect.UnionRectIncludeEmpty(originalClientRect, clientRect);
// With the sizes computed, now it's time to lay out our children.
PRBool needsRedraw = PR_FALSE;
PRBool finished;
nscoord passes = 0;
// We flow children at their preferred locations (along with the appropriate computed flex).
// After we flow a child, it is possible that the child will change its size. If/when this happens,
// we have to do another pass. Typically only 2 passes are required, but the code is prepared to
// do as many passes as are necessary to achieve equilibrium.
nscoord x = 0;
nscoord y = 0;
nscoord origX = 0;
nscoord origY = 0;
// |passes| stores our number of passes. If for any reason we end up doing more than, say, 10
// passes, we assert to indicate that something is seriously screwed up.
passes = 0;
do
{
#ifdef DEBUG_REFLOW
if (passes > 0) {
AddIndents();
printf("ChildResized doing pass: %d\n", passes);
}
#endif
// Always assume that we're done. This will change if, for example, children don't stay
// the same size after being flowed.
finished = PR_TRUE;
// Handle box packing.
HandleBoxPack(aBox, frameState, x, y, originalClientRect, clientRect);
// Now that packing is taken care of we set up a few additional
// tracking variables.
origX = x;
origY = y;
nscoord nextX = x;
nscoord nextY = y;
// Now we iterate over our box children and our box size lists in
// parallel. For each child, we look at its sizes and figure out
// where to place it.
nsComputedBoxSize* childComputedBoxSize = computedBoxSizes;
nsBoxSize* childBoxSize = boxSizes;
nsIBox* child = aBox->GetChildBox();
PRInt32 count = 0;
while (child || (childBoxSize && childBoxSize->bogus))
{
// If for some reason, our lists are not the same length, we guard
// by bailing out of the loop.
if (childBoxSize == nsnull) {
NS_NOTREACHED("Lists not the same length.");
break;
}
nscoord width = clientRect.width;
nscoord height = clientRect.height;
if (!childBoxSize->bogus) {
// We have a valid box size entry. This entry already contains information about our
// sizes along the axis of the box (e.g., widths in a horizontal box). If our default
// ALIGN is not stretch, however, then we also need to know the child's size along the
// opposite axis.
if (!(frameState & NS_STATE_AUTO_STRETCH)) {
nsSize prefSize = child->GetPrefSize(aState);
nsSize minSize = child->GetMinSize(aState);
nsSize maxSize = child->GetMaxSize(aState);
prefSize = nsBox::BoundsCheck(minSize, prefSize, maxSize);
AddMargin(child, prefSize);
width = PR_MIN(prefSize.width, originalClientRect.width);
height = PR_MIN(prefSize.height, originalClientRect.height);
}
}
// Obtain the computed size along the axis of the box for this child from the computedBoxSize entry.
// We store the result in |width| for horizontal boxes and |height| for vertical boxes.
if (frameState & NS_STATE_IS_HORIZONTAL)
width = childComputedBoxSize->size;
else
height = childComputedBoxSize->size;
// Adjust our x/y for the left/right spacing.
if (frameState & NS_STATE_IS_HORIZONTAL) {
if (frameState & NS_STATE_IS_DIRECTION_NORMAL)
x += (childBoxSize->left);
else
x -= (childBoxSize->right);
} else {
if (frameState & NS_STATE_IS_DIRECTION_NORMAL)
y += (childBoxSize->left);
else
y -= (childBoxSize->right);
}
nextX = x;
nextY = y;
// Now we build a child rect.
nscoord rectX = x;
nscoord rectY = y;
if (!(frameState & NS_STATE_IS_DIRECTION_NORMAL)) {
if (frameState & NS_STATE_IS_HORIZONTAL)
rectX -= width;
else
rectY -= height;
}
// We now create an accurate child rect based off our computed size information.
nsRect childRect(rectX, rectY, width, height);
// Sanity check against our clientRect. It is possible that a child specified
// a size that is too large to fit. If that happens, then we have to grow
// our client rect. Remember, clientRect is not the total rect of the enclosing
// box. It currently holds our perception of how big the children needed to
// be.
if (childRect.width > clientRect.width || childRect.height > clientRect.height) {
if (childRect.width > clientRect.width)
clientRect.width = childRect.width;
if (childRect.height > clientRect.height)
clientRect.height = childRect.height;
}
// |x|, |y|, |nextX|, and |nextY| are updated by this function call. This call
// also deals with box ALIGNMENT (when stretching is not turned on).
ComputeChildsNextPosition(aBox, child,
x,
y,
nextX,
nextY,
childRect,
originalClientRect,
childBoxSize->ascent,
maxAscent);
// Now we update our nextX/Y along our axis and we update our x/y along the opposite
// axis (since a non-stretching alignment could have caused an adjustment).
if (frameState & NS_STATE_IS_HORIZONTAL) {
if (frameState & NS_STATE_IS_DIRECTION_NORMAL)
nextX += (childBoxSize->right);
else
nextX -= (childBoxSize->left);
childRect.y = y;
}
else {
if (frameState & NS_STATE_IS_DIRECTION_NORMAL)
nextY += (childBoxSize->right);
else
nextY -= (childBoxSize->left);
childRect.x = x;
}
// If we encounter a completely bogus box size, we just leave this child completely
// alone and continue through the loop to the next child.
if (childBoxSize->bogus)
{
childComputedBoxSize = childComputedBoxSize->next;
childBoxSize = childBoxSize->next;
count++;
x = nextX;
y = nextY;
continue;
}
nsMargin margin(0,0,0,0);
PRBool layout = PR_TRUE;
// Deflate the rect of our child by its margin.
child->GetMargin(margin);
childRect.Deflate(margin);
if (childRect.width < 0)
childRect.width = 0;
if (childRect.height < 0)
childRect.height = 0;
// Now we're trying to figure out if we have to lay out this child, i.e., to call
// the child's Layout method.
if (passes > 0) {
layout = PR_FALSE;
} else {
// Always perform layout if we are dirty or have dirty children
if (!NS_SUBTREE_DIRTY(child))
layout = PR_FALSE;
}
// We computed a childRect. Now we want to set the bounds of the child to be that rect.
// If our old rect is different, then we know our size changed and we cache that fact
// in the |sizeChanged| variable.
nsRect oldRect(child->GetRect());
PRBool sizeChanged = PR_FALSE;
child->SetBounds(aState, childRect);
sizeChanged = (childRect.width != oldRect.width || childRect.height != oldRect.height);
PRBool possibleRedraw = PR_FALSE;
if (sizeChanged) {
// Our size is different. Sanity check against our maximum allowed size to ensure
// we didn't exceed it.
nsSize minSize = child->GetMinSize(aState);
nsSize maxSize = child->GetMaxSize(aState);
maxSize = nsBox::BoundsCheckMinMax(minSize, maxSize);
// make sure the size is in our max size.
if (childRect.width > maxSize.width)
childRect.width = maxSize.width;
if (childRect.height > maxSize.height)
childRect.height = maxSize.height;
// set it again
child->SetBounds(aState, childRect);
// Since the child changed size, we know a redraw is probably going to be required.
possibleRedraw = PR_TRUE;
}
// if something moved then we might need to redraw
if (oldRect.x != childRect.x || oldRect.y != childRect.y)
possibleRedraw = PR_TRUE;
// If we already determined that layout was required or if our size has changed, then
// we make sure to call layout on the child, since its children may need to be shifted
// around as a result of the size change.
if (layout || sizeChanged)
child->Layout(aState);
// If the child was a block or inline (e.g., HTML) it may have changed its rect *during* layout.
// We have to check for this.
nsRect newChildRect(child->GetRect());
if (newChildRect != childRect) {
#ifdef DEBUG_GROW
child->DumpBox(stdout);
printf(" GREW from (%d,%d) -> (%d,%d)\n", childRect.width, childRect.height, newChildRect.width, newChildRect.height);
#endif
newChildRect.Inflate(margin);
childRect.Inflate(margin);
// The child changed size during layout. The ChildResized method handles this
// scenario.
ChildResized(aBox,
aState,
child,
childBoxSize,
childComputedBoxSize,
boxSizes,
computedBoxSizes,
childRect,
newChildRect,
clientRect,
flexes,
finished);
// Now that a child resized, it's entirely possible that OUR rect is too small. Now we
// ensure that |originalClientRect| is grown to accommodate the size of |clientRect|.
if (clientRect.width > originalClientRect.width || clientRect.height > originalClientRect.height) {
if (clientRect.width > originalClientRect.width)
originalClientRect.width = clientRect.width;
if (clientRect.height > originalClientRect.height)
originalClientRect.height = clientRect.height;
}
if (!(frameState & NS_STATE_IS_DIRECTION_NORMAL)) {
// Our childRect had its XMost() or YMost() (depending on our layout
// direction), positioned at a certain point. Ensure that the
// newChildRect satisfies the same constraint. Note that this is
// just equivalent to adjusting the x/y by the difference in
// width/height between childRect and newChildRect. So we don't need
// to reaccount for the left and right of the box layout state again.
if (frameState & NS_STATE_IS_HORIZONTAL)
newChildRect.x = childRect.XMost() - newChildRect.width;
else
newChildRect.y = childRect.YMost() - newChildRect.height;
}
// If the child resized then recompute its position.
ComputeChildsNextPosition(aBox, child,
x,
y,
nextX,
nextY,
newChildRect,
originalClientRect,
childBoxSize->ascent,
maxAscent);
// Only update the variable in the opposite axis (since this is only here to deal with
// a non-stretching ALIGNMENT)
if (frameState & NS_STATE_IS_HORIZONTAL)
newChildRect.y = y;
else
newChildRect.x = x;
if (newChildRect.width >= margin.left + margin.right && newChildRect.height >= margin.top + margin.bottom)
newChildRect.Deflate(margin);
if (childRect.width >= margin.left + margin.right && childRect.height >= margin.top + margin.bottom)
childRect.Deflate(margin);
child->SetBounds(aState, newChildRect);
// If we are the first box that changed size, then we don't need to do a second pass
if (count == 0)
finished = PR_TRUE;
}
// Now update our x/y finally.
x = nextX;
y = nextY;
// If we get here and |possibleRedraw| is still set, then it's official. We do need a repaint.
if (possibleRedraw)
needsRedraw = PR_TRUE;
// Move to the next child.
childComputedBoxSize = childComputedBoxSize->next;
childBoxSize = childBoxSize->next;
child = child->GetNextBox();
count++;
}
// Sanity-checking code to ensure we don't do an infinite # of passes.
passes++;
NS_ASSERTION(passes < 10, "A Box's child is constantly growing!!!!!");
if (passes > 10)
break;
} while (PR_FALSE == finished);
// Get rid of our size lists.
while(boxSizes)
{
nsBoxSize* toDelete = boxSizes;
boxSizes = boxSizes->next;
delete toDelete;
}
while(computedBoxSizes)
{
nsComputedBoxSize* toDelete = computedBoxSizes;
computedBoxSizes = computedBoxSizes->next;
delete toDelete;
}
// See if one of our children forced us to get bigger
nsRect tmpClientRect(originalClientRect);
nsMargin bp(0,0,0,0);
aBox->GetBorderAndPadding(bp);
tmpClientRect.Inflate(bp);
if (tmpClientRect.width > originalSize.width || tmpClientRect.height > originalSize.height)
{
// if it did reset our bounds.
nsRect bounds(aBox->GetRect());
if (tmpClientRect.width > originalSize.width)
bounds.width = tmpClientRect.width;
if (tmpClientRect.height > originalSize.height)
bounds.height = tmpClientRect.height;
aBox->SetBounds(aState, bounds);
}
// Because our size grew, we now have to readjust because of box packing. Repack
// in order to update our x and y to the correct values.
HandleBoxPack(aBox, frameState, x, y, originalClientRect, clientRect);
// Compare against our original x and y and only worry about adjusting the children if
// we really did have to change the positions because of packing (typically for 'center'
// or 'end' pack values).
if (x != origX || y != origY) {
nsIBox* child = aBox->GetChildBox();
// reposition all our children
while (child)
{
nsRect childRect(child->GetRect());
childRect.x += (x - origX);
childRect.y += (y - origY);
child->SetBounds(aState, childRect);
child = child->GetNextBox();
}
}
// Now do our redraw.
if (needsRedraw)
aBox->Redraw(aState);
aState.PopStackMemory();
// That's it! If you made it this far without having a nervous breakdown,
// congratulations! Go get yourself a beer.
return NS_OK;
}
void
nsSprocketLayout::PopulateBoxSizes(nsIBox* aBox, nsBoxLayoutState& aState, nsBoxSize*& aBoxSizes, nsComputedBoxSize*& aComputedBoxSizes, nscoord& aMinSize, nscoord& aMaxSize, PRInt32& aFlexes)
{
// used for the equal size flag
nscoord biggestPrefWidth = 0;
nscoord biggestMinWidth = 0;
nscoord smallestMaxWidth = NS_INTRINSICSIZE;
nsFrameState frameState = 0;
GetFrameState(aBox, frameState);
//if (frameState & NS_STATE_CURRENTLY_IN_DEBUG)
// printf("In debug\n");
aMinSize = 0;
aMaxSize = NS_INTRINSICSIZE;
PRBool isHorizontal;
if (IsHorizontal(aBox))
isHorizontal = PR_TRUE;
else
isHorizontal = PR_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
nsIBox* child = aBox->GetChildBox();
aFlexes = 0;
nsBoxSize* currentBox = nsnull;
#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(aState);
} else {
flex = start->flex;
start = start->next;
}
if (flex > 0)
aFlexes++;
child = child->GetNextBox();
}
#endif
// get pref, min, max
child = aBox->GetChildBox();
currentBox = aBoxSizes;
nsBoxSize* last = nsnull;
nscoord maxFlex = 0;
PRInt32 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;
PRBool collapsed = child->IsCollapsed(aState);
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->ascent = ascent;
currentBox->collapsed = collapsed;
aFlexes += currentBox->flex;
child = child->GetNextBox();
last = currentBox;
currentBox = currentBox->next;
}
if (childCount > 0) {
nscoord maxAllowedFlex = nscoord_MAX / childCount;
if (NS_UNLIKELY(maxFlex > maxAllowedFlex)) {
// clamp all the flexes
currentBox = aBoxSizes;
while (currentBox) {
currentBox->flex = PR_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 = PR_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;
}
}
}
void
nsSprocketLayout::ComputeChildsNextPosition(nsIBox* aBox,
nsIBox* aChild,
nscoord& aCurX,
nscoord& aCurY,
nscoord& aNextX,
nscoord& aNextY,
const nsRect& aCurrentChildSize,
const nsRect& aBoxRect,
nscoord childAscent,
nscoord aMaxAscent)
{
nsFrameState frameState = 0;
GetFrameState(aBox, frameState);
nsIBox::Halignment halign = aBox->GetHAlign();
nsIBox::Valignment valign = aBox->GetVAlign();
if (IsHorizontal(aBox)) {
// Handle alignment of a horizontal box's children.
if (frameState & NS_STATE_IS_DIRECTION_NORMAL)
aNextX = aCurX + aCurrentChildSize.width;
else aNextX = aCurX - aCurrentChildSize.width;
if (frameState & NS_STATE_AUTO_STRETCH)
aCurY = aBoxRect.y;
else {
switch (valign)
{
case nsBoxFrame::vAlign_BaseLine:
aCurY = aBoxRect.y + (aMaxAscent - childAscent);
break;
case nsBoxFrame::vAlign_Top:
aCurY = aBoxRect.y;
break;
case nsBoxFrame::vAlign_Middle:
aCurY = aBoxRect.y + (aBoxRect.height/2 - aCurrentChildSize.height/2);
break;
case nsBoxFrame::vAlign_Bottom:
aCurY = aBoxRect.y + aBoxRect.height - aCurrentChildSize.height;
break;
}
}
} else {
// Handle alignment of a vertical box's children.
if (frameState & NS_STATE_IS_DIRECTION_NORMAL)
aNextY = aCurY + aCurrentChildSize.height;
else
aNextY = aCurY - aCurrentChildSize.height;
if (frameState & NS_STATE_AUTO_STRETCH)
aCurX = aBoxRect.x;
else {
PRUint8 frameDirection = GetFrameDirection(aBox);
switch (halign)
{
case nsBoxFrame::hAlign_Left:
if (frameDirection == NS_STYLE_DIRECTION_LTR)
aCurX = aBoxRect.x;
else
aCurX = aBoxRect.x + aBoxRect.width - aCurrentChildSize.width;
break;
case nsBoxFrame::hAlign_Center:
aCurX = aBoxRect.x + (aBoxRect.width/2 - aCurrentChildSize.width/2);
break;
case nsBoxFrame::hAlign_Right:
if (frameDirection == NS_STYLE_DIRECTION_LTR)
aCurX = aBoxRect.x + aBoxRect.width - aCurrentChildSize.width;
else
aCurX = aBoxRect.x;
break;
}
}
}
}
void
nsSprocketLayout::ChildResized(nsIBox* aBox,
nsBoxLayoutState& aState,
nsIBox* aChild,
nsBoxSize* aChildBoxSize,
nsComputedBoxSize* aChildComputedSize,
nsBoxSize* aBoxSizes,
nsComputedBoxSize* aComputedBoxSizes,
const nsRect& aChildLayoutRect,
nsRect& aChildActualRect,
nsRect& aContainingRect,
PRInt32 aFlexes,
PRBool& aFinished)
{
nsRect childCurrentRect(aChildLayoutRect);
PRBool isHorizontal = IsHorizontal(aBox);
nscoord childLayoutWidth = GET_WIDTH(aChildLayoutRect,isHorizontal);
nscoord& childActualWidth = GET_WIDTH(aChildActualRect,isHorizontal);
nscoord& containingWidth = GET_WIDTH(aContainingRect,isHorizontal);
//nscoord childLayoutHeight = GET_HEIGHT(aChildLayoutRect,isHorizontal);
nscoord& childActualHeight = GET_HEIGHT(aChildActualRect,isHorizontal);
nscoord& containingHeight = GET_HEIGHT(aContainingRect,isHorizontal);
PRBool recompute = PR_FALSE;
// if we are a horizontal box see if the child will fit inside us.
if ( childActualHeight > containingHeight) {
// if we are a horizontal box and the child is bigger than our height
// ok if the height changed then we need to reflow everyone but us at the new height
// so we will set the changed index to be us. And signal that we need a new pass.
nsSize min = aChild->GetMinSize(aState);
nsSize max = nsBox::BoundsCheckMinMax(min, aChild->GetMaxSize(aState));
AddMargin(aChild, max);
if (isHorizontal)
childActualHeight = max.height < childActualHeight ? max.height : childActualHeight;
else
childActualHeight = max.width < childActualHeight ? max.width : childActualHeight;
// only set if it changes
if (childActualHeight > containingHeight) {
containingHeight = childActualHeight;
// remember we do not need to clear the resized list because changing the height of a horizontal box
// will not affect the width of any of its children because block flow left to right, top to bottom. Just trust me
// on this one.
aFinished = PR_FALSE;
// only recompute if there are flexes.
if (aFlexes > 0) {
// relayout everything
recompute = PR_TRUE;
InvalidateComputedSizes(aComputedBoxSizes);
nsComputedBoxSize* node = aComputedBoxSizes;
while(node) {
node->resized = PR_FALSE;
node = node->next;
}
}
}
}
if (childActualWidth > childLayoutWidth) {
nsSize min = aChild->GetMinSize(aState);
nsSize max = nsBox::BoundsCheckMinMax(min, aChild->GetMaxSize(aState));
AddMargin(aChild, max);
// our width now becomes the new size
if (isHorizontal)
childActualWidth = max.width < childActualWidth ? max.width : childActualWidth;
else
childActualWidth = max.height < childActualWidth ? max.height : childActualWidth;
if (childActualWidth > childLayoutWidth) {
aChildComputedSize->size = childActualWidth;
aChildBoxSize->min = childActualWidth;
if (aChildBoxSize->pref < childActualWidth)
aChildBoxSize->pref = childActualWidth;
if (aChildBoxSize->max < childActualWidth)
aChildBoxSize->max = childActualWidth;
// if we have flexible elements with us then reflex things. Otherwise we can skip doing it.
if (aFlexes > 0) {
InvalidateComputedSizes(aComputedBoxSizes);
nsComputedBoxSize* node = aComputedBoxSizes;
aChildComputedSize->resized = PR_TRUE;
while(node) {
if (node->resized)
node->valid = PR_TRUE;
node = node->next;
}
recompute = PR_TRUE;
aFinished = PR_FALSE;
} else {
containingWidth += aChildComputedSize->size - childLayoutWidth;
}
}
}
if (recompute)
ComputeChildSizes(aBox, aState, containingWidth, aBoxSizes, aComputedBoxSizes);
if (childCurrentRect != aChildActualRect) {
// the childRect includes the margin
// make sure we remove it before setting
// the bounds.
nsMargin margin(0,0,0,0);
aChild->GetMargin(margin);
nsRect rect(aChildActualRect);
if (rect.width >= margin.left + margin.right && rect.height >= margin.top + margin.bottom)
rect.Deflate(margin);
aChild->SetBounds(aState, rect);
aChild->Layout(aState);
}
}
void
nsSprocketLayout::InvalidateComputedSizes(nsComputedBoxSize* aComputedBoxSizes)
{
while(aComputedBoxSizes) {
aComputedBoxSizes->valid = PR_FALSE;
aComputedBoxSizes = aComputedBoxSizes->next;
}
}
void
nsSprocketLayout::ComputeChildSizes(nsIBox* aBox,
nsBoxLayoutState& aState,
nscoord& aGivenSize,
nsBoxSize* aBoxSizes,
nsComputedBoxSize*& aComputedBoxSizes)
{
//nscoord onePixel = aState.PresContext()->IntScaledPixelsToTwips(1);
PRInt32 sizeRemaining = aGivenSize;
PRInt32 spacerConstantsRemaining = 0;
// ----- calculate the spacers constants and the size remaining -----
if (!aComputedBoxSizes)
aComputedBoxSizes = new (aState) nsComputedBoxSize();
nsBoxSize* boxSizes = aBoxSizes;
nsComputedBoxSize* computedBoxSizes = aComputedBoxSizes;
PRInt32 count = 0;
PRInt32 validCount = 0;
while (boxSizes)
{
NS_ASSERTION((boxSizes->min <= boxSizes->pref && boxSizes->pref <= boxSizes->max),"bad pref, min, max size");
// ignore collapsed children
// if (boxSizes->collapsed)
// {
// computedBoxSizes->valid = PR_TRUE;
// computedBoxSizes->size = boxSizes->pref;
// validCount++;
// boxSizes->flex = 0;
// }// else {
if (computedBoxSizes->valid) {
sizeRemaining -= computedBoxSizes->size;
validCount++;
} else {
if (boxSizes->flex == 0)
{
computedBoxSizes->valid = PR_TRUE;
computedBoxSizes->size = boxSizes->pref;
validCount++;
}
spacerConstantsRemaining += boxSizes->flex;
sizeRemaining -= boxSizes->pref;
}
sizeRemaining -= (boxSizes->left + boxSizes->right);
//}
boxSizes = boxSizes->next;
if (boxSizes && !computedBoxSizes->next)
computedBoxSizes->next = new (aState) nsComputedBoxSize();
computedBoxSizes = computedBoxSizes->next;
count++;
}
// everything accounted for?
if (validCount < count)
{
// ----- Ok we are give a size to fit into so stretch or squeeze to fit
// ----- Make sure we look at our min and max size
PRBool limit = PR_TRUE;
for (int pass=1; PR_TRUE == limit; pass++)
{
limit = PR_FALSE;
boxSizes = aBoxSizes;
computedBoxSizes = aComputedBoxSizes;
while (boxSizes) {
// ignore collapsed spacers
// if (!boxSizes->collapsed) {
nscoord pref = 0;
nscoord max = NS_INTRINSICSIZE;
nscoord min = 0;
nscoord flex = 0;
pref = boxSizes->pref;
min = boxSizes->min;
max = boxSizes->max;
flex = boxSizes->flex;
// ----- look at our min and max limits make sure we aren't too small or too big -----
if (!computedBoxSizes->valid) {
PRInt32 newSize = pref + sizeRemaining*flex/spacerConstantsRemaining; //NSToCoordRound(float((sizeRemaining*flex)/spacerConstantsRemaining));
if (newSize<=min) {
computedBoxSizes->size = min;
computedBoxSizes->valid = PR_TRUE;
spacerConstantsRemaining -= flex;
sizeRemaining += pref;
sizeRemaining -= min;
limit = PR_TRUE;
} else if (newSize>=max) {
computedBoxSizes->size = max;
computedBoxSizes->valid = PR_TRUE;
spacerConstantsRemaining -= flex;
sizeRemaining += pref;
sizeRemaining -= max;
limit = PR_TRUE;
}
}
// }
boxSizes = boxSizes->next;
computedBoxSizes = computedBoxSizes->next;
}
}
}
// ---- once we have removed and min and max issues just stretch us out in the remaining space
// ---- or shrink us. Depends on the size remaining and the spacer constants
aGivenSize = 0;
boxSizes = aBoxSizes;
computedBoxSizes = aComputedBoxSizes;
while (boxSizes) {
// ignore collapsed spacers
// if (!(boxSizes && boxSizes->collapsed)) {
nscoord pref = 0;
nscoord flex = 0;
pref = boxSizes->pref;
flex = boxSizes->flex;
if (!computedBoxSizes->valid) {
computedBoxSizes->size = pref + flex*sizeRemaining/spacerConstantsRemaining; //NSToCoordFloor(float((flex*sizeRemaining)/spacerConstantsRemaining));
computedBoxSizes->valid = PR_TRUE;
}
aGivenSize += (boxSizes->left + boxSizes->right);
aGivenSize += computedBoxSizes->size;
// }
boxSizes = boxSizes->next;
computedBoxSizes = computedBoxSizes->next;
}
}
nsSize
nsSprocketLayout::GetPrefSize(nsIBox* aBox, nsBoxLayoutState& aState)
{
nsSize vpref (0, 0);
PRBool isHorizontal = IsHorizontal(aBox);
nscoord biggestPref = 0;
// run through all the children and get their min, max, and preferred sizes
// return us the size of the box
nsIBox* child = aBox->GetChildBox();
nsFrameState frameState = 0;
GetFrameState(aBox, frameState);
PRBool isEqual = !!(frameState & NS_STATE_EQUAL_SIZE);
PRInt32 count = 0;
while (child)
{
// ignore collapsed children
if (!child->IsCollapsed(aState))
{
nsSize pref = child->GetPrefSize(aState);
AddMargin(child, pref);
if (isEqual) {
if (isHorizontal)
{
if (pref.width > biggestPref)
biggestPref = pref.width;
} else {
if (pref.height > biggestPref)
biggestPref = pref.height;
}
}
AddLargestSize(vpref, pref, isHorizontal);
count++;
}
child = child->GetNextBox();
}
if (isEqual) {
if (isHorizontal)
vpref.width = biggestPref*count;
else
vpref.height = biggestPref*count;
}
// now add our border and padding
AddBorderAndPadding(aBox, vpref);
return vpref;
}
nsSize
nsSprocketLayout::GetMinSize(nsIBox* aBox, nsBoxLayoutState& aState)
{
nsSize minSize (0, 0);
PRBool isHorizontal = IsHorizontal(aBox);
nscoord biggestMin = 0;
// run through all the children and get their min, max, and preferred sizes
// return us the size of the box
nsIBox* child = aBox->GetChildBox();
nsFrameState frameState = 0;
GetFrameState(aBox, frameState);
PRBool isEqual = !!(frameState & NS_STATE_EQUAL_SIZE);
PRInt32 count = 0;
while (child)
{
// ignore collapsed children
if (!child->IsCollapsed(aState))
{
nsSize min = child->GetMinSize(aState);
nsSize pref(0,0);
// if the child is not flexible then
// its min size is its pref size.
if (child->GetFlex(aState) == 0) {
pref = child->GetPrefSize(aState);
if (isHorizontal)
min.width = pref.width;
else
min.height = pref.height;
}
if (isEqual) {
if (isHorizontal)
{
if (min.width > biggestMin)
biggestMin = min.width;
} else {
if (min.height > biggestMin)
biggestMin = min.height;
}
}
AddMargin(child, min);
AddLargestSize(minSize, min, isHorizontal);
count++;
}
child = child->GetNextBox();
}
if (isEqual) {
if (isHorizontal)
minSize.width = biggestMin*count;
else
minSize.height = biggestMin*count;
}
// now add our border and padding
AddBorderAndPadding(aBox, minSize);
return minSize;
}
nsSize
nsSprocketLayout::GetMaxSize(nsIBox* aBox, nsBoxLayoutState& aState)
{
PRBool isHorizontal = IsHorizontal(aBox);
nscoord smallestMax = NS_INTRINSICSIZE;
nsSize maxSize (NS_INTRINSICSIZE, NS_INTRINSICSIZE);
// run through all the children and get their min, max, and preferred sizes
// return us the size of the box
nsIBox* child = aBox->GetChildBox();
nsFrameState frameState = 0;
GetFrameState(aBox, frameState);
PRBool isEqual = !!(frameState & NS_STATE_EQUAL_SIZE);
PRInt32 count = 0;
while (child)
{
// ignore collapsed children
if (!child->IsCollapsed(aState))
{
// if completely redefined don't even ask our child for its size.
nsSize min = child->GetMinSize(aState);
nsSize max = nsBox::BoundsCheckMinMax(min, child->GetMaxSize(aState));
AddMargin(child, max);
AddSmallestSize(maxSize, max, isHorizontal);
if (isEqual) {
if (isHorizontal)
{
if (max.width < smallestMax)
smallestMax = max.width;
} else {
if (max.height < smallestMax)
smallestMax = max.height;
}
}
count++;
}
child = child->GetNextBox();
}
if (isEqual) {
if (isHorizontal) {
if (smallestMax != NS_INTRINSICSIZE)
maxSize.width = smallestMax*count;
else
maxSize.width = NS_INTRINSICSIZE;
} else {
if (smallestMax != NS_INTRINSICSIZE)
maxSize.height = smallestMax*count;
else
maxSize.height = NS_INTRINSICSIZE;
}
}
// now add our border and padding
AddBorderAndPadding(aBox, maxSize);
return maxSize;
}
nscoord
nsSprocketLayout::GetAscent(nsIBox* aBox, nsBoxLayoutState& aState)
{
nscoord vAscent = 0;
PRBool isHorizontal = IsHorizontal(aBox);
// run through all the children and get their min, max, and preferred sizes
// return us the size of the box
nsIBox* child = aBox->GetChildBox();
while (child)
{
// ignore collapsed children
//if (!child->IsCollapsed(aState))
//{
// if completely redefined don't even ask our child for its size.
nscoord ascent = child->GetBoxAscent(aState);
nsMargin margin;
child->GetMargin(margin);
ascent += margin.top;
if (isHorizontal)
{
if (ascent > vAscent)
vAscent = ascent;
} else {
if (vAscent == 0)
vAscent = ascent;
}
//}
child = child->GetNextBox();
}
return vAscent;
}
void
nsSprocketLayout::SetLargestSize(nsSize& aSize1, const nsSize& aSize2, PRBool aIsHorizontal)
{
if (aIsHorizontal)
{
if (aSize1.height < aSize2.height)
aSize1.height = aSize2.height;
} else {
if (aSize1.width < aSize2.width)
aSize1.width = aSize2.width;
}
}
void
nsSprocketLayout::SetSmallestSize(nsSize& aSize1, const nsSize& aSize2, PRBool aIsHorizontal)
{
if (aIsHorizontal)
{
if (aSize1.height > aSize2.height)
aSize1.height = aSize2.height;
} else {
if (aSize1.width > aSize2.width)
aSize1.width = aSize2.width;
}
}
void
nsSprocketLayout::AddLargestSize(nsSize& aSize, const nsSize& aSizeToAdd, PRBool aIsHorizontal)
{
if (aIsHorizontal)
AddCoord(aSize.width, aSizeToAdd.width);
else
AddCoord(aSize.height, aSizeToAdd.height);
SetLargestSize(aSize, aSizeToAdd, aIsHorizontal);
}
void
nsSprocketLayout::AddCoord(nscoord& aCoord, nscoord aCoordToAdd)
{
if (aCoord != NS_INTRINSICSIZE)
{
if (aCoordToAdd == NS_INTRINSICSIZE)
aCoord = aCoordToAdd;
else
aCoord += aCoordToAdd;
}
}
void
nsSprocketLayout::AddSmallestSize(nsSize& aSize, const nsSize& aSizeToAdd, PRBool aIsHorizontal)
{
if (aIsHorizontal)
AddCoord(aSize.width, aSizeToAdd.width);
else
AddCoord(aSize.height, aSizeToAdd.height);
SetSmallestSize(aSize, aSizeToAdd, aIsHorizontal);
}
PRBool
nsSprocketLayout::GetDefaultFlex(PRInt32& aFlex)
{
aFlex = 0;
return PR_TRUE;
}
void
nsBoxSize::Add(const nsSize& minSize,
const nsSize& prefSize,
const nsSize& maxSize,
nscoord aAscent,
nscoord aFlex,
PRBool aIsHorizontal)
{
nscoord pref2;
nscoord min2;
nscoord max2;
if (aIsHorizontal) {
pref2 = prefSize.width;
min2 = minSize.width;
max2 = maxSize.width;
} else {
pref2 = prefSize.height;
min2 = minSize.height;
max2 = maxSize.height;
}
if (min2 > min)
min = min2;
if (pref2 > pref)
pref = pref2;
if (max2 < max)
max = max2;
flex = aFlex;
if (!aIsHorizontal) {
if (aAscent > ascent)
ascent = aAscent;
}
}
void
nsBoxSize::Add(const nsMargin& aMargin, PRBool aIsHorizontal)
{
if (aIsHorizontal) {
left += aMargin.left;
right += aMargin.right;
pref -= (aMargin.left + aMargin.right);
} else {
left += aMargin.top;
right += aMargin.bottom;
pref -= (aMargin.top + aMargin.bottom);
}
if (pref < min)
min = pref;
}
nsComputedBoxSize::nsComputedBoxSize()
{
Clear();
}
void
nsComputedBoxSize::Clear()
{
resized = PR_FALSE;
valid = PR_FALSE;
size = 0;
next = nsnull;
}
nsBoxSize::nsBoxSize()
{
Clear();
}
void
nsBoxSize::Clear()
{
pref = 0;
min = 0;
max = NS_INTRINSICSIZE;
collapsed = PR_FALSE;
ascent = 0;
left = 0;
right = 0;
flex = 0;
next = nsnull;
bogus = PR_FALSE;
}
void*
nsBoxSize::operator new(size_t sz, nsBoxLayoutState& aState) CPP_THROW_NEW
{
return aState.AllocateStackMemory(sz);
}
void
nsBoxSize::operator delete(void* aPtr, size_t sz)
{
}
void*
nsComputedBoxSize::operator new(size_t sz, nsBoxLayoutState& aState) CPP_THROW_NEW
{
return aState.AllocateStackMemory(sz);
}
void
nsComputedBoxSize::operator delete(void* aPtr, size_t sz)
{
}
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