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