The Tor Browser: layout/xul/nsStackLayout.cpp@7e26c7da4463 (annotated)

layout/xul/nsStackLayout.cpp@7e26c7da4463 (annotated)

layout/xul/nsStackLayout.cpp

Wed, 31 Dec 2014 06:55:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:50 +0100
changeset 2: 7e26c7da4463
permissions: -rw-r--r--

Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2

 /* -*- 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 "nsStackLayout.h"
 #include "nsCOMPtr.h"
 #include "nsBoxLayoutState.h"
 #include "nsBox.h"
 #include "nsBoxFrame.h"
 #include "nsGkAtoms.h"
 #include "nsIContent.h"
 #include "nsNameSpaceManager.h"
 using namespace mozilla;
 nsBoxLayout* nsStackLayout::gInstance = nullptr;
 #define SPECIFIED_LEFT (1 << NS_SIDE_LEFT)
 #define SPECIFIED_RIGHT (1 << NS_SIDE_RIGHT)
 #define SPECIFIED_TOP (1 << NS_SIDE_TOP)
 #define SPECIFIED_BOTTOM (1 << NS_SIDE_BOTTOM)
 nsresult
 NS_NewStackLayout( nsIPresShell* aPresShell, nsCOMPtr<nsBoxLayout>& aNewLayout)
 {
   if (!nsStackLayout::gInstance) {
     nsStackLayout::gInstance = new nsStackLayout();
     NS_IF_ADDREF(nsStackLayout::gInstance);
   }
   // we have not instance variables so just return our static one.
   aNewLayout = nsStackLayout::gInstance;
   return NS_OK;
 }
 /*static*/ void
 nsStackLayout::Shutdown()
 {
   NS_IF_RELEASE(gInstance);
 }
 nsStackLayout::nsStackLayout()
 {
 }
 /*
  * Sizing: we are as wide as the widest child plus its left offset
  * we are tall as the tallest child plus its top offset.
  *
  * Only children which have -moz-stack-sizing set to stretch-to-fit
  * (the default) will be included in the size computations.
  */
 nsSize
 nsStackLayout::GetPrefSize(nsIFrame* aBox, nsBoxLayoutState& aState)
 {
   nsSize prefSize (0, 0);
   nsIFrame* child = aBox->GetChildBox();
   while (child) {
     if (child->StyleXUL()->mStretchStack) {
       nsSize pref = child->GetPrefSize(aState);
       AddMargin(child, pref);
       nsMargin offset;
       GetOffset(aState, child, offset);
       pref.width += offset.LeftRight();
       pref.height += offset.TopBottom();
       AddLargestSize(prefSize, pref);
     }
     child = child->GetNextBox();
   }
   AddBorderAndPadding(aBox, prefSize);
   return prefSize;
 }
 nsSize
 nsStackLayout::GetMinSize(nsIFrame* aBox, nsBoxLayoutState& aState)
 {
   nsSize minSize (0, 0);
   nsIFrame* child = aBox->GetChildBox();
   while (child) {
     if (child->StyleXUL()->mStretchStack) {
       nsSize min = child->GetMinSize(aState);
       AddMargin(child, min);
       nsMargin offset;
       GetOffset(aState, child, offset);
       min.width += offset.LeftRight();
       min.height += offset.TopBottom();
       AddLargestSize(minSize, min);
     }
     child = child->GetNextBox();
   }
   AddBorderAndPadding(aBox, minSize);
   return minSize;
 }
 nsSize
 nsStackLayout::GetMaxSize(nsIFrame* aBox, nsBoxLayoutState& aState)
 {
   nsSize maxSize (NS_INTRINSICSIZE, NS_INTRINSICSIZE);
   nsIFrame* child = aBox->GetChildBox();
   while (child) {
     if (child->StyleXUL()->mStretchStack) {
       nsSize min = child->GetMinSize(aState);
       nsSize max = child->GetMaxSize(aState);
       max = nsBox::BoundsCheckMinMax(min, max);
       AddMargin(child, max);
       nsMargin offset;
       GetOffset(aState, child, offset);
       max.width += offset.LeftRight();
       max.height += offset.TopBottom();
       AddSmallestSize(maxSize, max);
     }
     child = child->GetNextBox();
   }
   AddBorderAndPadding(aBox, maxSize);
   return maxSize;
 }
 nscoord
 nsStackLayout::GetAscent(nsIFrame* aBox, nsBoxLayoutState& aState)
 {
   nscoord vAscent = 0;
   nsIFrame* child = aBox->GetChildBox();
   while (child) {
     nscoord ascent = child->GetBoxAscent(aState);
     nsMargin margin;
     child->GetMargin(margin);
     ascent += margin.top;
     if (ascent > vAscent)
       vAscent = ascent;
     child = child->GetNextBox();
   }
   return vAscent;
 }
 uint8_t
 nsStackLayout::GetOffset(nsBoxLayoutState& aState, nsIFrame* aChild, nsMargin& aOffset)
 {
   aOffset = nsMargin(0, 0, 0, 0);
   // get the left, right, top and bottom offsets
   // As an optimization, we cache the fact that we are not positioned to avoid
   // wasting time fetching attributes.
   if (aChild->IsBoxFrame() &&
       (aChild->GetStateBits() & NS_STATE_STACK_NOT_POSITIONED))
     return 0;
   uint8_t offsetSpecified = 0;
   nsIContent* content = aChild->GetContent();
   if (content) {
     bool ltr = aChild->StyleVisibility()->mDirection == NS_STYLE_DIRECTION_LTR;
     nsAutoString value;
     nsresult error;
     content->GetAttr(kNameSpaceID_None, nsGkAtoms::start, value);
     if (!value.IsEmpty()) {
       value.Trim("%");
       if (ltr) {
         aOffset.left =
           nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
         offsetSpecified |= SPECIFIED_LEFT;
       } else {
         aOffset.right =
           nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
         offsetSpecified |= SPECIFIED_RIGHT;
       }
     }
     content->GetAttr(kNameSpaceID_None, nsGkAtoms::end, value);
     if (!value.IsEmpty()) {
       value.Trim("%");
       if (ltr) {
         aOffset.right =
           nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
         offsetSpecified |= SPECIFIED_RIGHT;
       } else {
         aOffset.left =
           nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
         offsetSpecified |= SPECIFIED_LEFT;
       }
     }
     content->GetAttr(kNameSpaceID_None, nsGkAtoms::left, value);
     if (!value.IsEmpty()) {
       value.Trim("%");
       aOffset.left =
         nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
       offsetSpecified |= SPECIFIED_LEFT;
     }
     content->GetAttr(kNameSpaceID_None, nsGkAtoms::right, value);
     if (!value.IsEmpty()) {
       value.Trim("%");
       aOffset.right =
         nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
       offsetSpecified |= SPECIFIED_RIGHT;
     }
     content->GetAttr(kNameSpaceID_None, nsGkAtoms::top, value);
     if (!value.IsEmpty()) {
       value.Trim("%");
       aOffset.top =
         nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
       offsetSpecified |= SPECIFIED_TOP;
     }
     content->GetAttr(kNameSpaceID_None, nsGkAtoms::bottom, value);
     if (!value.IsEmpty()) {
       value.Trim("%");
       aOffset.bottom =
         nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
       offsetSpecified |= SPECIFIED_BOTTOM;
     }
   }
   if (!offsetSpecified && aChild->IsBoxFrame()) {
     // If no offset was specified at all, then we cache this fact to avoid requerying
     // CSS or the content model.
     aChild->AddStateBits(NS_STATE_STACK_NOT_POSITIONED);
   }
   return offsetSpecified;
 }
 NS_IMETHODIMP
 nsStackLayout::Layout(nsIFrame* aBox, nsBoxLayoutState& aState)
 {
   nsRect clientRect;
   aBox->GetClientRect(clientRect);
   bool grow;
   do {
     nsIFrame* child = aBox->GetChildBox();
     grow = false;
     while (child)
     {
       nsMargin margin;
       child->GetMargin(margin);
       nsRect childRect(clientRect);
       childRect.Deflate(margin);
       if (childRect.width < 0)
         childRect.width = 0;
       if (childRect.height < 0)
         childRect.height = 0;
       nsRect oldRect(child->GetRect());
       bool sizeChanged = !oldRect.IsEqualEdges(childRect);
       // only lay out dirty children or children whose sizes have changed
       if (sizeChanged || NS_SUBTREE_DIRTY(child)) {
           // add in the child's margin
           nsMargin margin;
           child->GetMargin(margin);
           // obtain our offset from the top left border of the stack's content box.
           nsMargin offset;
           uint8_t offsetSpecified = GetOffset(aState, child, offset);
           // Set the position and size based on which offsets have been specified:
           //   left only - offset from left edge, preferred width
           //   right only - offset from right edge, preferred width
           //   left and right - offset from left and right edges, width in between this
           //   neither - no offset, full width of stack
           // Vertical direction is similar.
           //
           // Margins on the child are also included in the edge offsets
           if (offsetSpecified) {
             if (offsetSpecified & SPECIFIED_LEFT) {
               childRect.x = clientRect.x + offset.left + margin.left;
               if (offsetSpecified & SPECIFIED_RIGHT) {
                 nsSize min = child->GetMinSize(aState);
                 nsSize max = child->GetMaxSize(aState);
                 nscoord width = clientRect.width - offset.LeftRight() - margin.LeftRight();
                 childRect.width = clamped(width, min.width, max.width);
               }
               else {
                 childRect.width = child->GetPrefSize(aState).width;
               }
             }
             else if (offsetSpecified & SPECIFIED_RIGHT) {
               childRect.width = child->GetPrefSize(aState).width;
               childRect.x = clientRect.XMost() - offset.right - margin.right - childRect.width;
             }
             if (offsetSpecified & SPECIFIED_TOP) {
               childRect.y = clientRect.y + offset.top + margin.top;
               if (offsetSpecified & SPECIFIED_BOTTOM) {
                 nsSize min = child->GetMinSize(aState);
                 nsSize max = child->GetMaxSize(aState);
                 nscoord height = clientRect.height - offset.TopBottom() - margin.TopBottom();
                 childRect.height = clamped(height, min.height, max.height);
               }
               else {
                 childRect.height = child->GetPrefSize(aState).height;
               }
             }
             else if (offsetSpecified & SPECIFIED_BOTTOM) {
               childRect.height = child->GetPrefSize(aState).height;
               childRect.y = clientRect.YMost() - offset.bottom - margin.bottom - childRect.height;
             }
           }
           // Now place the child.
           child->SetBounds(aState, childRect);
           // Flow the child.
           child->Layout(aState);
           // Get the child's new rect.
           childRect = child->GetRect();
           childRect.Inflate(margin);
           if (child->StyleXUL()->mStretchStack) {
             // Did the child push back on us and get bigger?
             if (offset.LeftRight() + childRect.width > clientRect.width) {
               clientRect.width = childRect.width + offset.LeftRight();
               grow = true;
             }
             if (offset.TopBottom() + childRect.height > clientRect.height) {
               clientRect.height = childRect.height + offset.TopBottom();
               grow = true;
             }
           }
        }
        child = child->GetNextBox();
      }
    } while (grow);
    // if some HTML inside us got bigger we need to force ourselves to
    // get bigger
    nsRect bounds(aBox->GetRect());
    nsMargin bp;
    aBox->GetBorderAndPadding(bp);
    clientRect.Inflate(bp);
    if (clientRect.width > bounds.width || clientRect.height > bounds.height)
    {
      if (clientRect.width > bounds.width)
        bounds.width = clientRect.width;
      if (clientRect.height > bounds.height)
        bounds.height = clientRect.height;
      aBox->SetBounds(aState, bounds);
    }
    return NS_OK;
 }

The Tor Browser / annotate

layout/xul/nsStackLayout.cpp@7e26c7da4463 (annotated)

layout/xul/nsStackLayout.cpp