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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//
+// 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 "nsContainerFrame.h"
+#include "nsBoxFrame.h"
+#include "StackArena.h"
+#include "mozilla/Likely.h"
+#include <algorithm>
+
+nsBoxLayout* nsSprocketLayout::gInstance = nullptr;
+
+//#define DEBUG_GROW
+
+#define DEBUG_SPRING_SIZE 8
+#define DEBUG_BORDER_SIZE 2
+#define COIL_SIZE 8
+
+
+nsresult
+NS_NewSprocketLayout(nsCOMPtr<nsBoxLayout>& 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()
+{
+}
+
+bool
+nsSprocketLayout::IsXULHorizontal(nsIFrame* aBox)
+{
+ return (aBox->GetStateBits() & NS_STATE_IS_HORIZONTAL) != 0;
+}
+
+void
+nsSprocketLayout::GetFrameState(nsIFrame* aBox, nsFrameState& aState)
+{
+ aState = aBox->GetStateBits();
+}
+
+static uint8_t
+GetFrameDirection(nsIFrame* aBox)
+{
+ return aBox->StyleVisibility()->mDirection;
+}
+
+static void
+HandleBoxPack(nsIFrame* 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|.
+ uint8_t 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.
+ nsIFrame::Halignment halign = aBox->GetXULHAlign();
+ nsIFrame::Valignment valign = aBox->GetXULVAlign();
+
+ // 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::XULLayout(nsIFrame* 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->IsXULCollapsed()) {
+ nsIFrame* child = nsBox::GetChildXULBox(aBox);
+ while(child)
+ {
+ nsBoxFrame::LayoutChildAt(aState, child, nsRect(0,0,0,0));
+ child = nsBox::GetNextXULBox(child);
+ }
+ return NS_OK;
+ }
+
+ nsBoxLayoutState::AutoReflowDepth depth(aState);
+ mozilla::AutoStackArena arena;
+
+ // ----- figure out our size ----------
+ const nsSize originalSize = aBox->GetSize();
+
+ // -- make sure we remove our border and padding ----
+ nsRect clientRect;
+ aBox->GetXULClientRect(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.
+ nsRect originalClientRect(clientRect);
+
+ // The frame state contains cached knowledge about our box, such as our orientation
+ // and direction.
+ nsFrameState frameState = nsFrameState(0);
+ GetFrameState(aBox, frameState);
+
+ // Build a list of our children's desired sizes and computed sizes
+ nsBoxSize* boxSizes = nullptr;
+ nsComputedBoxSize* computedBoxSizes = nullptr;
+
+ nscoord min = 0;
+ nscoord max = 0;
+ int32_t flexes = 0;
+ PopulateBoxSizes(aBox, aState, boxSizes, 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 (!IsXULHorizontal(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 (IsXULHorizontal(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;
+ }
+ }
+
+ // With the sizes computed, now it's time to lay out our children.
+ bool 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;
+
+ // |childResized| lets us know if a child changed its size after we attempted to lay it out at
+ // the specified size. If this happens, we usually have to do another pass.
+ bool childResized = false;
+
+ // |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 = 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;
+
+ // 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;
+
+ nsIFrame* child = nsBox::GetChildXULBox(aBox);
+
+ int32_t 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 == nullptr) {
+ 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->GetXULPrefSize(aState);
+ nsSize minSize = child->GetXULMinSize(aState);
+ nsSize maxSize = child->GetXULMaxSize(aState);
+ prefSize = nsBox::BoundsCheck(minSize, prefSize, maxSize);
+
+ AddMargin(child, prefSize);
+ width = std::min(prefSize.width, originalClientRect.width);
+ height = std::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);
+ }
+
+ // 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)
+ clientRect.width = childRect.width;
+
+ if (childRect.height > clientRect.height)
+ clientRect.height = childRect.height;
+
+ // Either |nextX| or |nextY| is updated by this function call, according
+ // to our axis.
+ nscoord nextX = x;
+ nscoord nextY = y;
+
+ ComputeChildsNextPosition(aBox, x, y, nextX, nextY, childRect);
+
+ // Now we further update our nextX/Y along our axis.
+ // We also set childRect.y/x along the opposite axis appropriately for a
+ // stretch alignment. (Non-stretch alignment is handled below.)
+ if (frameState & NS_STATE_IS_HORIZONTAL) {
+ if (frameState & NS_STATE_IS_DIRECTION_NORMAL)
+ nextX += (childBoxSize->right);
+ else
+ nextX -= (childBoxSize->left);
+ childRect.y = originalClientRect.y;
+ }
+ else {
+ if (frameState & NS_STATE_IS_DIRECTION_NORMAL)
+ nextY += (childBoxSize->right);
+ else
+ nextY -= (childBoxSize->left);
+ if (GetFrameDirection(aBox) == NS_STYLE_DIRECTION_LTR) {
+ childRect.x = originalClientRect.x;
+ } else {
+ // keep the right edge of the box the same
+ childRect.x = clientRect.x + originalClientRect.width - childRect.width;
+ }
+ }
+
+ // 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);
+
+ bool layout = true;
+
+ // Deflate the rect of our child by its margin.
+ child->GetXULMargin(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 XULLayout method.
+ if (passes > 0) {
+ layout = false;
+ } else {
+ // Always perform layout if we are dirty or have dirty children
+ if (!NS_SUBTREE_DIRTY(child))
+ layout = false;
+ }
+
+ nsRect oldRect(child->GetRect());
+
+ // Non-stretch alignment will be handled in AlignChildren(), so don't
+ // change child out-of-axis positions yet.
+ if (!(frameState & NS_STATE_AUTO_STRETCH)) {
+ if (frameState & NS_STATE_IS_HORIZONTAL) {
+ childRect.y = oldRect.y;
+ } else {
+ childRect.x = oldRect.x;
+ }
+ }
+
+ // 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.
+
+ child->SetXULBounds(aState, childRect);
+ bool sizeChanged = (childRect.width != oldRect.width ||
+ childRect.height != oldRect.height);
+
+ if (sizeChanged) {
+ // Our size is different. Sanity check against our maximum allowed size to ensure
+ // we didn't exceed it.
+ nsSize minSize = child->GetXULMinSize(aState);
+ nsSize maxSize = child->GetXULMaxSize(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->SetXULBounds(aState, childRect);
+ }
+
+ // 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->XULLayout(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.IsEqualInterior(childRect)) {
+#ifdef DEBUG_GROW
+ child->XULDumpBox(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);
+
+ // We note that a child changed size, which means that another pass will be required.
+ childResized = true;
+
+ // 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)
+ 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 (!(frameState & NS_STATE_IS_HORIZONTAL)) {
+ if (GetFrameDirection(aBox) != NS_STYLE_DIRECTION_LTR) {
+ // keep the right edge the same
+ newChildRect.x = childRect.XMost() - newChildRect.width;
+ }
+ }
+
+ // If the child resized then recompute its position.
+ ComputeChildsNextPosition(aBox, x, y, nextX, nextY, newChildRect);
+
+ 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->SetXULBounds(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 = true;
+ }
+
+ // Now update our x/y finally.
+ x = nextX;
+ y = nextY;
+
+ // Move to the next child.
+ childComputedBoxSize = childComputedBoxSize->next;
+ childBoxSize = childBoxSize->next;
+
+ child = nsBox::GetNextXULBox(child);
+ 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 (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;
+ }
+
+ if (childResized) {
+ // See if one of our children forced us to get bigger
+ nsRect tmpClientRect(originalClientRect);
+ nsMargin bp(0,0,0,0);
+ aBox->GetXULBorderAndPadding(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->SetXULBounds(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) {
+ nsIFrame* child = nsBox::GetChildXULBox(aBox);
+
+ // reposition all our children
+ while (child)
+ {
+ nsRect childRect(child->GetRect());
+ childRect.x += (x - origX);
+ childRect.y += (y - origY);
+ child->SetXULBounds(aState, childRect);
+ child = nsBox::GetNextXULBox(child);
+ }
+ }
+
+ // Perform out-of-axis alignment for non-stretch alignments
+ if (!(frameState & NS_STATE_AUTO_STRETCH)) {
+ AlignChildren(aBox, aState);
+ }
+
+ // 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(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 (IsXULHorizontal(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::GetChildXULBox(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->GetXULFlex();
+
+ currentBox->flex = flex;
+ currentBox->collapsed = child->IsXULCollapsed();
+ } else {
+ flex = start->flex;
+ start = start->next;
+ }
+
+ if (flex > 0)
+ aFlexes++;
+
+ child = GetNextXULBox(child);
+ }
+#endif
+
+ // get pref, min, max
+ child = nsBox::GetChildXULBox(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->IsXULCollapsed();
+
+ 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->GetXULPrefSize(aState);
+ minSize = child->GetXULMinSize(aState);
+ maxSize = nsBox::BoundsCheckMinMax(minSize, child->GetXULMaxSize(aState));
+ ascent = child->GetXULBoxAscent(aState);
+ nsMargin margin;
+ child->GetXULMargin(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->GetXULFlex();
+
+ // 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::GetNextXULBox(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;
+ }
+ }
+
+}
+
+void
+nsSprocketLayout::ComputeChildsNextPosition(nsIFrame* aBox,
+ const nscoord& aCurX,
+ const nscoord& aCurY,
+ nscoord& aNextX,
+ nscoord& aNextY,
+ const nsRect& aCurrentChildSize)
+{
+ // Get the position along the box axis for the child.
+ // The out-of-axis position is not set.
+ nsFrameState frameState = nsFrameState(0);
+ GetFrameState(aBox, frameState);
+
+ if (IsXULHorizontal(aBox)) {
+ // horizontal box's children.
+ if (frameState & NS_STATE_IS_DIRECTION_NORMAL)
+ aNextX = aCurX + aCurrentChildSize.width;
+ else
+ aNextX = aCurX - aCurrentChildSize.width;
+
+ } else {
+ // vertical box's children.
+ if (frameState & NS_STATE_IS_DIRECTION_NORMAL)
+ aNextY = aCurY + aCurrentChildSize.height;
+ else
+ aNextY = aCurY - aCurrentChildSize.height;
+ }
+}
+
+void
+nsSprocketLayout::AlignChildren(nsIFrame* aBox,
+ nsBoxLayoutState& aState)
+{
+ nsFrameState frameState = nsFrameState(0);
+ GetFrameState(aBox, frameState);
+ bool isHorizontal = (frameState & NS_STATE_IS_HORIZONTAL) != 0;
+ nsRect clientRect;
+ aBox->GetXULClientRect(clientRect);
+
+ NS_PRECONDITION(!(frameState & NS_STATE_AUTO_STRETCH),
+ "Only AlignChildren() with non-stretch alignment");
+
+ // These are only calculated if needed
+ nsIFrame::Halignment halign;
+ nsIFrame::Valignment valign;
+ nscoord maxAscent = 0;
+ bool isLTR;
+
+ if (isHorizontal) {
+ valign = aBox->GetXULVAlign();
+ if (valign == nsBoxFrame::vAlign_BaseLine) {
+ maxAscent = aBox->GetXULBoxAscent(aState);
+ }
+ } else {
+ isLTR = GetFrameDirection(aBox) == NS_STYLE_DIRECTION_LTR;
+ halign = aBox->GetXULHAlign();
+ }
+
+ nsIFrame* child = nsBox::GetChildXULBox(aBox);
+ while (child) {
+
+ nsMargin margin;
+ child->GetXULMargin(margin);
+ nsRect childRect = child->GetRect();
+
+ if (isHorizontal) {
+ const nscoord startAlign = clientRect.y + margin.top;
+ const nscoord endAlign =
+ clientRect.YMost() - margin.bottom - childRect.height;
+
+ nscoord y = 0;
+ switch (valign) {
+ case nsBoxFrame::vAlign_Top:
+ y = startAlign;
+ break;
+ case nsBoxFrame::vAlign_Middle:
+ // Should this center the border box?
+ // This centers the margin box, the historical behavior.
+ y = (startAlign + endAlign) / 2;
+ break;
+ case nsBoxFrame::vAlign_Bottom:
+ y = endAlign;
+ break;
+ case nsBoxFrame::vAlign_BaseLine:
+ // Alignments don't force the box to grow (only sizes do),
+ // so keep the children within the box.
+ y = maxAscent - child->GetXULBoxAscent(aState);
+ y = std::max(startAlign, y);
+ y = std::min(y, endAlign);
+ break;
+ }
+
+ childRect.y = y;
+
+ } else { // vertical box
+ const nscoord leftAlign = clientRect.x + margin.left;
+ const nscoord rightAlign =
+ clientRect.XMost() - margin.right - childRect.width;
+
+ nscoord x = 0;
+ switch (halign) {
+ case nsBoxFrame::hAlign_Left: // start
+ x = isLTR ? leftAlign : rightAlign;
+ break;
+ case nsBoxFrame::hAlign_Center:
+ x = (leftAlign + rightAlign) / 2;
+ break;
+ case nsBoxFrame::hAlign_Right: // end
+ x = isLTR ? rightAlign : leftAlign;
+ break;
+ }
+
+ childRect.x = x;
+ }
+
+ if (childRect.TopLeft() != child->GetPosition()) {
+ child->SetXULBounds(aState, childRect);
+ }
+
+ child = nsBox::GetNextXULBox(child);
+ }
+}
+
+void
+nsSprocketLayout::ChildResized(nsIFrame* aBox,
+ nsBoxLayoutState& aState,
+ nsIFrame* aChild,
+ nsBoxSize* aChildBoxSize,
+ nsComputedBoxSize* aChildComputedSize,
+ nsBoxSize* aBoxSizes,
+ nsComputedBoxSize* aComputedBoxSizes,
+ const nsRect& aChildLayoutRect,
+ nsRect& aChildActualRect,
+ nsRect& aContainingRect,
+ int32_t aFlexes,
+ bool& aFinished)
+
+{
+ nsRect childCurrentRect(aChildLayoutRect);
+
+ bool isHorizontal = IsXULHorizontal(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);
+
+ bool recompute = 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->GetXULMinSize(aState);
+ nsSize max = nsBox::BoundsCheckMinMax(min, aChild->GetXULMaxSize(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 = false;
+
+ // only recompute if there are flexes.
+ if (aFlexes > 0) {
+ // relayout everything
+ recompute = true;
+ InvalidateComputedSizes(aComputedBoxSizes);
+ nsComputedBoxSize* node = aComputedBoxSizes;
+
+ while(node) {
+ node->resized = false;
+ node = node->next;
+ }
+
+ }
+ }
+ }
+
+ if (childActualWidth > childLayoutWidth) {
+ nsSize min = aChild->GetXULMinSize(aState);
+ nsSize max = nsBox::BoundsCheckMinMax(min, aChild->GetXULMaxSize(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 = true;
+
+ while(node) {
+ if (node->resized)
+ node->valid = true;
+
+ node = node->next;
+ }
+
+ recompute = true;
+ aFinished = false;
+ } else {
+ containingWidth += aChildComputedSize->size - childLayoutWidth;
+ }
+ }
+ }
+
+ if (recompute)
+ ComputeChildSizes(aBox, aState, containingWidth, aBoxSizes, aComputedBoxSizes);
+
+ if (!childCurrentRect.IsEqualInterior(aChildActualRect)) {
+ // the childRect includes the margin
+ // make sure we remove it before setting
+ // the bounds.
+ nsMargin margin(0,0,0,0);
+ aChild->GetXULMargin(margin);
+ nsRect rect(aChildActualRect);
+ if (rect.width >= margin.left + margin.right && rect.height >= margin.top + margin.bottom)
+ rect.Deflate(margin);
+
+ aChild->SetXULBounds(aState, rect);
+ aChild->XULLayout(aState);
+ }
+
+}
+
+void
+nsSprocketLayout::InvalidateComputedSizes(nsComputedBoxSize* aComputedBoxSizes)
+{
+ while(aComputedBoxSizes) {
+ aComputedBoxSizes->valid = false;
+ aComputedBoxSizes = aComputedBoxSizes->next;
+ }
+}
+
+void
+nsSprocketLayout::ComputeChildSizes(nsIFrame* aBox,
+ nsBoxLayoutState& aState,
+ nscoord& aGivenSize,
+ nsBoxSize* aBoxSizes,
+ nsComputedBoxSize*& aComputedBoxSizes)
+{
+
+ //nscoord onePixel = aState.PresContext()->IntScaledPixelsToTwips(1);
+
+ int32_t sizeRemaining = aGivenSize;
+ int32_t spacerConstantsRemaining = 0;
+
+ // ----- calculate the spacers constants and the size remaining -----
+
+ if (!aComputedBoxSizes)
+ aComputedBoxSizes = new (aState) nsComputedBoxSize();
+
+ nsBoxSize* boxSizes = aBoxSizes;
+ nsComputedBoxSize* computedBoxSizes = aComputedBoxSizes;
+ int32_t count = 0;
+ int32_t 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 = true;
+ // computedBoxSizes->size = boxSizes->pref;
+ // validCount++;
+ // boxSizes->flex = 0;
+ // }// else {
+
+ if (computedBoxSizes->valid) {
+ sizeRemaining -= computedBoxSizes->size;
+ validCount++;
+ } else {
+ if (boxSizes->flex == 0)
+ {
+ computedBoxSizes->valid = 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
+ bool limit = true;
+ for (int pass=1; true == limit; pass++)
+ {
+ limit = 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) {
+ int32_t newSize = pref + int32_t(int64_t(sizeRemaining) * flex / spacerConstantsRemaining);
+
+ if (newSize<=min) {
+ computedBoxSizes->size = min;
+ computedBoxSizes->valid = true;
+ spacerConstantsRemaining -= flex;
+ sizeRemaining += pref;
+ sizeRemaining -= min;
+ limit = true;
+ } else if (newSize>=max) {
+ computedBoxSizes->size = max;
+ computedBoxSizes->valid = true;
+ spacerConstantsRemaining -= flex;
+ sizeRemaining += pref;
+ sizeRemaining -= max;
+ limit = 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 + int32_t(int64_t(sizeRemaining) * flex / spacerConstantsRemaining);
+ computedBoxSizes->valid = true;
+ }
+
+ aGivenSize += (boxSizes->left + boxSizes->right);
+ aGivenSize += computedBoxSizes->size;
+
+ // }
+
+ boxSizes = boxSizes->next;
+ computedBoxSizes = computedBoxSizes->next;
+ }
+}
+
+
+nsSize
+nsSprocketLayout::GetXULPrefSize(nsIFrame* aBox, nsBoxLayoutState& aState)
+{
+ nsSize vpref (0, 0);
+ bool isHorizontal = IsXULHorizontal(aBox);
+
+ nscoord biggestPref = 0;
+
+ // run through all the children and get their min, max, and preferred sizes
+ // return us the size of the box
+
+ nsIFrame* child = nsBox::GetChildXULBox(aBox);
+ nsFrameState frameState = nsFrameState(0);
+ GetFrameState(aBox, frameState);
+ bool isEqual = !!(frameState & NS_STATE_EQUAL_SIZE);
+ int32_t count = 0;
+
+ while (child)
+ {
+ // ignore collapsed children
+ if (!child->IsXULCollapsed())
+ {
+ nsSize pref = child->GetXULPrefSize(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 = nsBox::GetNextXULBox(child);
+ }
+
+ 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::GetXULMinSize(nsIFrame* aBox, nsBoxLayoutState& aState)
+{
+ nsSize minSize (0, 0);
+ bool isHorizontal = IsXULHorizontal(aBox);
+
+ nscoord biggestMin = 0;
+
+
+ // run through all the children and get their min, max, and preferred sizes
+ // return us the size of the box
+
+ nsIFrame* child = nsBox::GetChildXULBox(aBox);
+ nsFrameState frameState = nsFrameState(0);
+ GetFrameState(aBox, frameState);
+ bool isEqual = !!(frameState & NS_STATE_EQUAL_SIZE);
+ int32_t count = 0;
+
+ while (child)
+ {
+ // ignore collapsed children
+ if (!child->IsXULCollapsed())
+ {
+ nsSize min = child->GetXULMinSize(aState);
+ nsSize pref(0,0);
+
+ // if the child is not flexible then
+ // its min size is its pref size.
+ if (child->GetXULFlex() == 0) {
+ pref = child->GetXULPrefSize(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 = nsBox::GetNextXULBox(child);
+ }
+
+
+ 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::GetXULMaxSize(nsIFrame* aBox, nsBoxLayoutState& aState)
+{
+
+ bool isHorizontal = IsXULHorizontal(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
+
+ nsIFrame* child = nsBox::GetChildXULBox(aBox);
+ nsFrameState frameState = nsFrameState(0);
+ GetFrameState(aBox, frameState);
+ bool isEqual = !!(frameState & NS_STATE_EQUAL_SIZE);
+ int32_t count = 0;
+
+ while (child)
+ {
+ // ignore collapsed children
+ if (!child->IsXULCollapsed())
+ {
+ // if completely redefined don't even ask our child for its size.
+ nsSize min = child->GetXULMinSize(aState);
+ nsSize max = nsBox::BoundsCheckMinMax(min, child->GetXULMaxSize(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 = nsBox::GetNextXULBox(child);
+ }
+
+ 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(nsIFrame* aBox, nsBoxLayoutState& aState)
+{
+ nscoord vAscent = 0;
+
+ bool isHorizontal = IsXULHorizontal(aBox);
+
+ // run through all the children and get their min, max, and preferred sizes
+ // return us the size of the box
+
+ nsIFrame* child = nsBox::GetChildXULBox(aBox);
+
+ while (child)
+ {
+ // ignore collapsed children
+ //if (!child->IsXULCollapsed())
+ //{
+ // if completely redefined don't even ask our child for its size.
+ nscoord ascent = child->GetXULBoxAscent(aState);
+
+ nsMargin margin;
+ child->GetXULMargin(margin);
+ ascent += margin.top;
+
+ if (isHorizontal)
+ {
+ if (ascent > vAscent)
+ vAscent = ascent;
+ } else {
+ if (vAscent == 0)
+ vAscent = ascent;
+ }
+ //}
+
+ child = nsBox::GetNextXULBox(child);
+ }
+
+ nsMargin borderPadding;
+ aBox->GetXULBorderAndPadding(borderPadding);
+
+ return vAscent + borderPadding.top;
+}
+
+void
+nsSprocketLayout::SetLargestSize(nsSize& aSize1, const nsSize& aSize2, bool 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, bool 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, bool 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, bool aIsHorizontal)
+{
+ if (aIsHorizontal)
+ AddCoord(aSize.width, aSizeToAdd.width);
+ else
+ AddCoord(aSize.height, aSizeToAdd.height);
+
+ SetSmallestSize(aSize, aSizeToAdd, aIsHorizontal);
+}
+
+bool
+nsSprocketLayout::GetDefaultFlex(int32_t& aFlex)
+{
+ aFlex = 0;
+ return true;
+}
+
+nsComputedBoxSize::nsComputedBoxSize()
+{
+ resized = false;
+ valid = false;
+ size = 0;
+ next = nullptr;
+}
+
+nsBoxSize::nsBoxSize()
+{
+ pref = 0;
+ min = 0;
+ max = NS_INTRINSICSIZE;
+ collapsed = false;
+ left = 0;
+ right = 0;
+ flex = 0;
+ next = nullptr;
+ bogus = false;
+}
+
+
+void*
+nsBoxSize::operator new(size_t sz, nsBoxLayoutState& aState) CPP_THROW_NEW
+{
+ return mozilla::AutoStackArena::Allocate(sz);
+}
+
+
+void
+nsBoxSize::operator delete(void* aPtr, size_t sz)
+{
+}
+
+
+void*
+nsComputedBoxSize::operator new(size_t sz, nsBoxLayoutState& aState) CPP_THROW_NEW
+{
+ return mozilla::AutoStackArena::Allocate(sz);
+}
+
+void
+nsComputedBoxSize::operator delete(void* aPtr, size_t sz)
+{
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-01 07:34:34 +0000