dom/flex/FlexItemValues.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "FlexItemValues.h"
   8
   9 #include "mozilla/dom/FlexBinding.h"
  10 #include "nsFlexContainerFrame.h"
  11
  12 namespace mozilla {
  13 namespace dom {
  14
  15 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(FlexItemValues, mParent, mNode,
  16                                       mFrameRect)
  17 NS_IMPL_CYCLE_COLLECTING_ADDREF(FlexItemValues)
  18 NS_IMPL_CYCLE_COLLECTING_RELEASE(FlexItemValues)
  19 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(FlexItemValues)
  20   NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  21   NS_INTERFACE_MAP_ENTRY(nsISupports)
  22 NS_INTERFACE_MAP_END
  23
  24 /**
  25  * Utility function to convert a nscoord size to CSS pixel values, with
  26  * graceful treatment of NS_UNCONSTRAINEDSIZE (which this function converts to
  27  * the double "positive infinity" value).
  28  *
  29  * This function is suitable for converting quantities that are expected to
  30  * sometimes legitimately (rather than arbitrarily/accidentally) contain the
  31  * sentinel value NS_UNCONSTRAINEDSIZE -- e.g. to handle "max-width: none".
  32  */
  33 static double ToPossiblyUnconstrainedPixels(nscoord aSize) {
  34   if (aSize == NS_UNCONSTRAINEDSIZE) {
  35     return std::numeric_limits<double>::infinity();
  36   }
  37   return nsPresContext::AppUnitsToDoubleCSSPixels(aSize);
  38 }
  39
  40 FlexItemValues::FlexItemValues(FlexLineValues* aParent,
  41                                const ComputedFlexItemInfo* aItem)
  42     : mParent(aParent) {
  43   MOZ_ASSERT(aItem,
  44              "Should never be instantiated with a null ComputedFlexLineInfo.");
  45
  46   // Eagerly copy values from aItem, because we're not
  47   // going to keep it around.
  48   mNode = aItem->mNode;
  49
  50   // Since mNode might be null, we associate the mFrameRect with
  51   // our parent.
  52   mFrameRect = new DOMRectReadOnly(
  53       mParent, nsPresContext::AppUnitsToDoubleCSSPixels(aItem->mFrameRect.X()),
  54       nsPresContext::AppUnitsToDoubleCSSPixels(aItem->mFrameRect.Y()),
  55       nsPresContext::AppUnitsToDoubleCSSPixels(aItem->mFrameRect.Width()),
  56       nsPresContext::AppUnitsToDoubleCSSPixels(aItem->mFrameRect.Height()));
  57
  58   // Convert app unit sizes to css pixel sizes.
  59   mMainBaseSize =
  60       nsPresContext::AppUnitsToDoubleCSSPixels(aItem->mMainBaseSize);
  61   mMainDeltaSize =
  62       nsPresContext::AppUnitsToDoubleCSSPixels(aItem->mMainDeltaSize);
  63   mMainMinSize = nsPresContext::AppUnitsToDoubleCSSPixels(aItem->mMainMinSize);
  64   mMainMaxSize = ToPossiblyUnconstrainedPixels(aItem->mMainMaxSize);
  65   mCrossMinSize =
  66       nsPresContext::AppUnitsToDoubleCSSPixels(aItem->mCrossMinSize);
  67   mCrossMaxSize = ToPossiblyUnconstrainedPixels(aItem->mCrossMaxSize);
  68
  69   mClampState = aItem->mClampState;
  70 }
  71
  72 JSObject* FlexItemValues::WrapObject(JSContext* aCx,
  73                                      JS::Handle<JSObject*> aGivenProto) {
  74   return FlexItemValues_Binding::Wrap(aCx, this, aGivenProto);
  75 }
  76
  77 nsINode* FlexItemValues::GetNode() const { return mNode; }
  78
  79 DOMRectReadOnly* FlexItemValues::FrameRect() const { return mFrameRect; }
  80
  81 double FlexItemValues::MainBaseSize() const { return mMainBaseSize; }
  82
  83 double FlexItemValues::MainDeltaSize() const { return mMainDeltaSize; }
  84
  85 double FlexItemValues::MainMinSize() const { return mMainMinSize; }
  86
  87 double FlexItemValues::MainMaxSize() const { return mMainMaxSize; }
  88
  89 double FlexItemValues::CrossMinSize() const { return mCrossMinSize; }
  90
  91 double FlexItemValues::CrossMaxSize() const { return mCrossMaxSize; }
  92
  93 FlexItemClampState FlexItemValues::ClampState() const { return mClampState; }
  94
  95 }  // namespace dom
  96 }  // namespace mozilla